CN102340272A - Motor driving device and driving method thereof - Google Patents
Motor driving device and driving method thereof Download PDFInfo
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Abstract
The invention relates to a motor driving device and a driving method thereof. The motor driving method is applied to the motor driving device. The motor driving device is cooperated with a motor and a magneto-electricity converter; the magneto-electricity converter generates a first sensing signal and a second sensing signal, wherein the first sensing signal represents the magnetic pole position of an S pole according to the operation of the motor; the second sensing signal represents the magnetic pole position of an N pole; and the motor driving device drives a motor to operate according to the first sensing signal and the second sensing signal. The motor driving method comprises the following steps of: firstly, comparing duty cycles between the previous periods of the first sensing signal and the second sensing signal so as to obtain a duty cycle difference between the first sensing signal and the second sensing signal; and according to the duty cycle difference, compensating the duty cycle of the next period of one of the first sensing signal and the second sensing signal with a smaller duty cycle so as to lower noise generated by motor operation while the working efficiency of the motor is improved.
Description
Technical field
The present invention relates to a kind of driving method, particularly relate to a kind of driving method that is applied to motor drive.
Background technology
Consult Fig. 1 and Fig. 2, Fig. 1 is the circuit diagram of motor system 900 now, and this motor system 900 (for example: 920 and one motor drive 930 Hall element) comprises a motor 910, a magnetoelastic transducer.Motor 910 is combinations of a rotor (permanent magnet) 911 and stator (coil groups) 912; Magnetoelastic transducer 920 in order to induction motor 910 in the running magnetic pole variation and produce the first induced signal Vh1 of an expression S utmost point position of magnetic pole; And the second induced signal Vh2 of an expression N utmost point position of magnetic pole, make motor drive 930 adjust the drive current Id of motor 910 according to the first induced signal Vh1 and the second induced signal Vh2.
On the ideal, the responsibility cycle of the first induced signal Vh1 and the second induced signal Vh2 (duty cycle) should be all 50%, and promptly the time of the magnetoelastic transducer 920 induction S utmost points and the N utmost point should be identical, shown in the Vh1 (idea1) and Vh2 (idea1) of Fig. 2.But in fact; The first induced signal Vh1 that magnetoelastic transducer 920 induces and the second induced signal Vh2 are that the time of high potential is also inequality; Shown in the Vh1 and Vh2 of Fig. 2; Make both the responsibility cycle of the corresponding drive signal that produces (being the corresponding drive signal Vd that produces of first induced signal Vh1 institute among Fig. 2) unequal, therefore and can't be correct reflect the position that rotor 911 belongs to, mainly be that following some reason is arranged:
1. owing to the error on making, the S utmost point of rotor 911 and the shape of the N utmost point are not identical, make magnetoelastic transducer 920 also unequal for the magnetoelectricity reaction of the S utmost point and the N utmost point;
2. the magnetism intensity (magnetic flux) of each magnetic pole is not identical yet on the rotor 911;
3. magnetoelastic transducer 920 can receive external electromagnetic wave interference or magnetic interference (magnetic interference that especially coil groups produced), makes its induced signal of responding to produce error; And
4. to make its position or placing direction with respect to each magnetic pole on the rotor 911 because of the relation of assembling be not in full accord for magnetoelastic transducer 920.
So will cause motor 910 can't reach higher efficient in the running; And the drive current Id that motor drive 930 is produced according to the unequal first induced signal Vh1 and the second induced signal Vh2 is also unbalanced, can make motor 910 produce the electromagnetism that reaches frequency in various degree and involve noise.
Therefore; If motor drive 930 can compensate the unequal first induced signal Vh1 and the second induced signal Vh2; Make motor 910 identical with the time of reverse rotation, so can improve the problem that above-mentioned prior art is run in the time that is rotated in the forward.
This shows that above-mentioned existing motor drive and driving method thereof obviously still have inconvenience and defective, and demand urgently further improving.In order to solve the problem of above-mentioned existence; Relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly; But do not see always that for a long time suitable design is developed completion; And common product and method do not have appropriate structure and method to address the above problem, and this obviously is the problem that the anxious desire of relevant dealer solves.Therefore how to found a kind of new motor drive and driving method, real one of the current important research and development problem that belongs to, also becoming the current industry utmost point needs improved target.
Summary of the invention
Main purpose of the present invention is; Overcome the defective that existing motor driven method exists; And a kind of new motor driven method, technical problem to be solved are provided is the first induced signal Vh1 and the second induced signal Vh2 that its compensation electromagnetic converter is induced, and makes motor the time that is rotated in the forward identical with the time of reverse rotation (or close); Noise when improving the operating efficiency of motor and reducing motor operation is very suitable for practicality.
Another object of the present invention is to; Overcome the defective that existing motor drive exists; And a kind of new motor drive is provided; Technical problem to be solved is that itself and a motor and a magnetoelastic transducer are used, and by comparing unit and compensating unit the first induced signal Vh1 and the second induced signal Vh2 that the electromagnetism converter is induced is compensated, and makes motor the time that is rotated in the forward identical with the time of reverse rotation (or close);, the noise when improving the operating efficiency of motor and reducing motor operation.
The object of the invention and solve its technical problem and adopt following technical scheme to realize.A kind of motor driven method according to the present invention's proposition; Be to be applied to a motor drive; This motor drive is to be used with a motor and a magnetoelastic transducer; This magnetoelastic transducer produces first induced signal of an expression S utmost point position of magnetic pole according to this motor operation, and second induced signal of an expression N utmost point position of magnetic pole, and this motor drive drives this motor operation according to this first induced signal and second induced signal; Wherein said driving method comprises following steps: (A) relatively this first induced signal and the responsibility cycle of this second induced signal between the last cycle, to obtain both responsibility cycle gaps; (B), compensate the wherein responsibility cycle of responsibility cycle smaller's following one-period of this first induced signal and this second induced signal according to this responsibility cycle gap.
The object of the invention and solve its technical problem and also can adopt following technical measures further to realize.
Aforesaid motor driven method, wherein said step (A) comprises following substep: one first digital signal and one second digital signal that (A-1) respectively this first induced signal and this second induced signal are converted to digital form; (A-2) count to the responsibility cycle of this first digital signal and this second digital signal respectively, to produce one first count value and one second count value; And (A-3) this first count value and this second count value are subtracted each other and produce the count difference value of responsibility cycle gap between this first induced signal of expression and this second induced signal.
Aforesaid motor driven method, wherein said step (B) are to prolong the wherein responsibility cycle of responsibility cycle smaller's following one-period of this first induced signal and this second induced signal according to this count difference value.
Aforesaid motor driven method, in the wherein said step (B), in this first induced signal and this second induced signal responsibility cycle of responsibility cycle smaller's following one-period be prolong this count difference value 1/N doubly, N be greater than zero integer.
Aforesaid motor driven method, wherein said step (A) are that the crest value with the crest value of this first induced signal and this second induced signal subtracts each other to produce the crest difference of responsibility cycle gap between this first induced signal of expression and this second induced signal each other.
Aforesaid motor driven method, wherein said step (B) are to draw high wherein crest value smaller's crest value of this first induced signal and this second induced signal according to this crest difference.
Aforesaid motor driven method, in the wherein said step (B), this first induced signal and this second induced signal wherein the responsibility cycle of responsibility cycle smaller's following one-period be prolong this crest difference 1/N doubly, N is the integer more than or equal to.
The object of the invention and solve its technical problem and also adopt following technical scheme to realize.A kind of motor drive according to the present invention's proposition; Be to be used with a motor and a magnetoelastic transducer; This magnetoelastic transducer produces first induced signal of an expression S utmost point position of magnetic pole according to this motor operation; And second induced signal of an expression N utmost point position of magnetic pole, wherein said motor drive comprises: a driver element, according to corresponding one first drive signal and one second drive signal of producing of this first induced signal and second induced signal to drive this motor operation; One comparing unit, the responsibility cycle in the last cycle of this first induced signal and this second induced signal relatively is to obtain both responsibility cycle gaps; And a compensating unit, according to this responsibility cycle gap this first induced signal of compensation and this second induced signal responsibility cycle of responsibility cycle smaller's following one-period wherein.
The object of the invention and solve its technical problem and also can adopt following technical measures further to realize.
Aforesaid motor drive, wherein said comparing unit comprises: one first change-over circuit receives this first induced signal that this magnetoelastic transducer produces; And converting this first induced signal one first digital signal of digital form to, one second change-over circuit receives this second induced signal that this magnetoelastic transducer produces; And this second induced signal converted to one second digital signal of digital form; One counting circuit is coupled to this first change-over circuit and this second change-over circuit, and counts to the responsibility cycle of this first digital signal and this second digital signal; To produce one first count value and one second count value; And a subtraction circuit, be coupled to this counting circuit,, this first count value and this second count value produce the count difference value of this responsibility cycle gap of expression in order to being subtracted each other.
Aforesaid motor drive, wherein said compensating unit are to prolong the wherein responsibility cycle of responsibility cycle smaller's following one-period of this first digital signal and this second digital signal according to this count difference value.
Aforesaid motor drive; Wherein said compensating unit comprises: a phase adjusting module; Be coupled to this subtraction circuit; It produces one first compensating signal and one second compensating signal that should count difference value according to this count difference value, one first or lock, this first or two inputs of lock be respectively coupled to this first change-over circuit and this phase adjusting module; And this first or the output of lock be coupled to this driver element; This first or lock supply this driver element to produce the first output signal of this first drive signal according to this first digital signal and this first compensating signal output one, and one second or lock, this second or two inputs of lock be respectively coupled to this change-over circuit and this phase adjusting module; And this second or the output of lock be coupled to this driver element, this second or lock supply this driver element to produce the second output signal of this second drive signal according to this second digital signal and this second compensating signal output one.
Aforesaid motor drive; When the responsibility cycle of wherein said first digital signal responsibility cycle less than this second digital signal; In the single cycle; When this first digital signal when high potential is reduced to electronegative potential, this first compensating signal rises to high potential from electronegative potential, this second compensating signal then maintains electronegative potential; When the responsibility cycle of this second digital signal responsibility cycle less than this first digital signal; In the single cycle; When this second digital signal when high potential is reduced to electronegative potential, this second compensating signal rises to high potential from electronegative potential, this first compensating signal then maintains electronegative potential.
Aforesaid motor drive, in the single cycle, the time that wherein said first compensating signal and described second compensating signal are high potential be for the 1/N of this count difference value doubly, N is the integer more than or equal to.
Aforesaid motor drive; When the responsibility cycle of wherein said second digital signal responsibility cycle less than described first digital signal; In the single cycle; When high potential is reduced to electronegative potential and after through one first scheduled time, this second compensating signal rises to high potential from electronegative potential, this first compensating signal then maintains electronegative potential in this first digital signal; When the responsibility cycle of described first digital signal responsibility cycle less than described second digital signal; In the single cycle; In this second digital signal when high potential is reduced to electronegative potential and after through one second scheduled time; This first compensating signal rises to high potential from electronegative potential, and this second compensating signal then maintains electronegative potential.
Aforesaid motor drive, wherein said first the scheduled time=(this second digital signal in the single cycle be electronegative potential time-this count difference value)/N, N is the integer more than or equal to; This second the scheduled time=(this first digital signal in the single cycle be electronegative potential time-this count difference value)/N, N is the integer more than or equal to.
Aforesaid motor drive; Wherein said comparing unit comprises: one first peak value fixture; Detect the crest value of described first induced signal of described magnetoelastic transducer generation; One second peak value fixture is detected the crest value of described second induced signal that described magnetoelastic transducer produces and a peak comparator; Be coupled to this first peak value fixture and this second peak value fixture, in order to the difference between the crest value of the crest value of this first induced signal relatively and this second induced signal and produce one and can compensate one of them crest difference of this first drive signal and this second drive signal.
Aforesaid motor drive; Wherein said compensating unit comprises: an analog signal adjuster; Signal is adjusted in said crest difference generation one first simulation relevant with the crest value of said first induced signal according to described peak comparator output, and signal is adjusted in second simulation relevant with the crest value of said second induced signal; One first change-over circuit receives this first induced signal that said magnetoelastic transducer produces, and this first induced signal is converted to one first digital signal of digital form according to a reference signal; One second change-over circuit receives this second induced signal that said magnetoelastic transducer produces, and this second induced signal is converted to one second digital signal of digital form according to said reference signal; One first variable resistor group is coupled to this first change-over circuit, and receives this first simulation to adjust signal and change its resistance value, changes this first digital signal with correspondence; And a second adjustable resistance group, be coupled to this second change-over circuit, and receive this second simulation to adjust signal and change its resistance value, change this second digital signal with correspondence.
Aforesaid motor drive, wherein said compensating unit comprises: a digital signal adjuster, be coupled to this subtraction circuit, it produces one first digital compensation signal and one second digital compensation signal that should count difference value according to this count difference value; One first variable resistor group is coupled to this first change-over circuit, and receives this first numeral to adjust signal and change its resistance value, changes this first digital signal with correspondence; One the second adjustable resistance group is coupled to this second change-over circuit, and receives this second numeral to adjust signal and change its resistance value, changes this second digital signal with correspondence.
The present invention compared with prior art has tangible advantage and beneficial effect.Know by above,, the invention provides a kind of motor drive and driving method thereof for achieving the above object.This motor drive is to be used with a motor and a magnetoelastic transducer.Magnetoelastic transducer produces first induced signal of an expression S utmost point position of magnetic pole according to motor operation, and second induced signal of an expression N utmost point position of magnetic pole, and this motor drive comprises: a driver element, a comparing unit and a compensating unit.
By technique scheme, the present invention has advantage and beneficial effect at least:
Through motor drive first induced signal and second induced signal that magnetoelastic transducer induced compensated, make the operating efficiency of motor and useful life to promote, and the electromagnetism that is produced when reducing motor operation simultaneously involves noise.
In sum; A kind of motor driven method of the present invention; Be to be applied to a motor drive, motor drive is to be used with a motor and a magnetoelastic transducer, and magnetoelastic transducer produces first induced signal of an expression S utmost point position of magnetic pole according to motor operation; And second induced signal of an expression N utmost point position of magnetic pole; Motor drive is according to first induced signal and the running of the second induced signal CD-ROM drive motor, and this motor driven method at first is comparison first induced signal and the responsibility cycle of second induced signal between the last cycle, to obtain both responsibility cycle gaps; According to this responsibility cycle gap, compensate the wherein responsibility cycle of responsibility cycle smaller's following one-period of first induced signal and second induced signal again, the noise that will be produced in the time of so can promoting the operating efficiency of motor and reduce motor operation simultaneously.The present invention has obvious improvement technically, and has tangible good effect, really is the new design of a novelty, progress, practicality.
Above-mentioned explanation only is the general introduction of technical scheme of the present invention; Understand technological means of the present invention in order can more to know; And can implement according to the content of specification, and for let of the present invention above-mentioned with other purposes, feature and advantage can be more obviously understandable, below special act preferred embodiment; And conjunction with figs., specify as follows.
Description of drawings
Fig. 1 is the sketch map of explanation prior art motor system;
Fig. 2 is first induced signal that induced of explanation prior art magnetoelastic transducer and the oscillogram of second induced signal;
Fig. 3 is that explanation motor drive of the present invention is the overall schematic that cooperates with motor, magnetoelastic transducer and switch unit;
Fig. 4 is the circuit block diagram of first preferred embodiment of explanation motor drive of the present invention;
Fig. 5 is the flow chart of the motor drive CD-ROM drive motor running of explanation first preferred embodiment;
Fig. 6 is the oscillogram of the signal exported of each circuit in the motor drive of explanation first preferred embodiment;
Fig. 7 is that the phase adjusting module of explanation first preferred embodiment is with the mode of delaying compensation second digital signal to be compensated;
Fig. 8 is that the phase adjusting module of explanation first preferred embodiment is with the mode that compensates in advance second digital signal to be compensated;
Fig. 9 is the circuit block diagram of second preferred embodiment of explanation motor drive of the present invention;
Figure 10 is the flow chart of the motor drive CD-ROM drive motor running of explanation second preferred embodiment;
Figure 11 is the oscillogram of first induced signal, second induced signal, first digital signal and second digital signal of explanation second preferred embodiment;
Figure 12 is first induced signal and the oscillogram of first digital signal before and after compensation of explanation second preferred embodiment; And
Figure 13 is the circuit block diagram of the 3rd preferred embodiment of explanation motor drive of the present invention.
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention; Below in conjunction with accompanying drawing and preferred embodiment; To motor drive and the driving method thereof that proposes according to the present invention; Its embodiment, structure, method, step, characteristic and effect thereof, specify as after.
Consult Fig. 3, be first preferred embodiment of motor drive of the present invention, this motor drive 30 is to be used with a motor 10, a magnetoelastic transducer 20 and a switching unit 40.In the present embodiment, magnetoelastic transducer 20 can be a Hall element, and the variation of magnetic pole induced the first induced signal Vh1 of the expression S utmost point position of magnetic pole when it turned round according to motor 10, and the second induced signal Vh2 of an expression N utmost point position of magnetic pole.The motor drive 30 of present embodiment is magnetoelastic transducer 20 to be received factor affecting such as the manufacturing process and the external world and induce the unequal first induced signal Vh1 and the second induced signal Vh2 compensates; Make motor 10 identical with the time of reverse rotation in the time that is rotated in the forward; To promote the operating efficiency and the useful life of motor 10, the noise that produces when reducing motor 10 runnings.
Cooperate and to consult Fig. 4, motor drive 30 comprises a comparing unit 31, a compensating unit 32 and a driver element 33.Comparing unit 31 is coupled to magnetoelastic transducer 20, in order to receive the first induced signal Vh1 and the second induced signal Vh2 and the gap of responsibility cycle more between the two; Compensating unit 32 is coupled to comparing unit 31, in order to compensate wherein responsibility cycle smaller's responsibility cycle of the first induced signal Vh1 and the second induced signal Vh2; Driver element 33 is coupled to compensating unit 32, in order to according to the first induced signal Vh1 and the second induced signal Vh2 and corresponding one first drive signal Vd1 and the one second drive signal Vd2 of producing, with CD-ROM drive motor 10 runnings.
Briefly; The design concept of present embodiment is the gap that compares responsibility cycle between the first induced signal Vh1 and the second induced signal Vh2 earlier by comparing unit 31; Go to prolong wherein responsibility cycle smaller of the first induced signal Vh1 and the second induced signal Vh2 through compensating unit 32 according to this gap more afterwards, so that the responsibility cycle identical (or approaching) of the first drive signal Vd1 that driver element 33 is exported and the second drive signal Vd2.
Comparing unit 31 comprises that one is coupled to the counting circuit 313 of first change-over circuit 311 and second change-over circuit 312 in order to first change-over circuit 311 that receives the first induced signal Vh1 that magnetoelastic transducer 20 induced, in order to second change-over circuit 312, that receives the second induced signal Vh2 that magnetoelastic transducer 20 induced, and one be coupled to counting circuit 313 subtraction circuit 314.
Compensating unit 32 comprise one be coupled to the subtraction circuit 314 of comparing unit 31 phase adjusting module 320, one first or lock 321 and one second or lock 322.First or two inputs of lock 321 be respectively coupled to the output of first change-over circuit 311 and the output of phase adjusting module 320, and first or the output of lock 321 be coupled to driver element 33; Second or two inputs of lock 322 be respectively coupled to the output of second change-over circuit 312 and the output of phase adjusting module 320, and second or the output of lock 322 be coupled to driver element 33.
The flow chart that below will cooperate Fig. 5, gap and compensating unit 32 that detailed description comparing unit 31 compares responsibility cycle between two induced signal Vh1, the Vh2 are the responsibility cycle that how to compensate two induced signal Vh1, Vh2.
Step S10, first change-over circuit 311 and second change-over circuit 312 convert the first induced signal Vh1 and the second induced signal Vh2 to the one first digital signal Vg1 and the one second digital signal Vg2 of digital form respectively.
In the present embodiment; The circuit of first change-over circuit 311 and second change-over circuit 312 is identical and be all comparator (comparator), and cooperates and consult Fig. 6, with first change-over circuit 311; It compares the voltage quasi position of the first induced signal Vh1 and a reference voltage Vref; If the voltage of the first induced signal Vh1 is greater than the voltage of reference voltage Vref, then the first digital signal Vg1 is high potential (digitone), then is electronegative potential (digit zero) on the contrary.Certainly, first change-over circuit 311 and second change-over circuit 312 also can be the different electric road, as long as can the first induced signal Vh1 and the second induced signal Vh2 be converted to the signal of digital form.
Step S20, counting circuit 313 count to the responsibility cycle of the first digital signal Vg1 and the second digital signal Vg2 respectively, to produce one first count value Vt1 and one second count value Vt2.Counting circuit 313 is to be a digit counter (counter), and as shown in Figure 6, wherein is to be example with the responsibility cycle of the first digital signal Vg1 greater than the responsibility cycle of the second digital signal Vg2, and therefore, the first count value Vt1 can be greater than the second count value Vt2.
Step S30, subtraction circuit 314 subtract each other the first count value Vt1 and the second count value Vt2 and produce the count difference value Ver of responsibility cycle gap between expression first an induced signal Vh1 and the second induced signal Vh2.
Step S40, the phase adjusting module 320 of compensating unit 32 produces one first compensating signal Vc1 and the one second compensating signal Vc2 of corresponding count difference value Ver according to count difference value Ver.
Step S50; First or lock 321 supply driver element 33 to produce to drive the first output signal Vo1 of the first moving signal Vd1 according to the first digital signal Vg1 and first compensating signal Vc1 output one, and second or lock 322 supply driver element 33 to produce the second output signal Vo2 of the second drive signal Vd2 according to the second digital signal Vg2 and second compensating signal Vc2 output one.
As shown in Figure 7, in the single cycle, because the responsibility cycle of the first digital signal Vg1 is greater than the responsibility cycle of the second digital signal Vg2, therefore, phase adjusting module 320 can compensate (promptly prolong it and be the time of high potential) to the second digital signal Vg2.Phase adjusting module 320 produces the second compensating signal Vc2 according to count difference value Ver; And, exports by high potential when reducing to electronegative potential in the second digital signal Vg2; Promptly the second digital signal Vg2 is when high potential is reduced to electronegative potential; The second compensating signal Vc2 rises to high potential (time t0) from electronegative potential, makes to win or the sustainable high potential (be t0 to t2 during this period of time) that maintains of lock 321 is exported the second output signal Vo2, reduces to electronegative potential up to the second compensating signal Vc2 from high potential.Therefore, the responsibility cycle (t1-t2) of the second digital signal Vg2 after the compensation (i.e. the second output signal Vo2) will be length compared to the responsibility cycle (t1-t0) of the second digital signal Vg2.In addition because the first digital signal Vg1 does not need compensation, so the first compensating signal Vc1 can keep electronegative potential (Fig. 6), making wins export signal Vo1 can be identical with the first digital signal Vg1.
On the contrary, if the responsibility cycle of the first digital signal Vg1 is less than the responsibility cycle of the second digital signal Vg2, then phase adjusting module 320 can compensate the first digital signal Vg1.Phase adjusting module 320 produces the first compensating signal Vc1 according to count difference value Ver; And, exports by high potential when reducing to electronegative potential in the first digital signal Vg1; Promptly the first digital signal Vg1 is when high potential is reduced to electronegative potential; The first compensating signal Vc1 rises to high potential from electronegative potential, and the responsibility cycle of the first output signal Vo1 can be extended, and the second compensating signal Vc2 then maintains electronegative potential.
What specify is; In the present embodiment, the first compensating signal Vc1 or the second compensating signal Vc2 are to be 1/N times for count difference value Ver the time of high potential, and N is the integer more than or equal to 1; That is to say in step S50; The first digital signal Vg1 and the second digital signal Vg2 wherein the responsibility cycle of responsibility cycle smaller's following one-period will be extended count difference value Ver 1/N doubly, and the N value can be set and change through modes such as softwares by the related personnel, and is not only like this certainly; Compensating signal is the time of high potential can comply with different demands equally with the relation between the count difference value Ver change, but not as limit.
Step S60, driver element 33 is changed the first output signal Vo1 and the second output signal Vo2 and the corresponding first drive signal Vd1 of generation and the second drive signal Vd2.
Step S70; But switch unit 40 produces the drive current Id of CD-ROM drive motor 10 runnings according to the first drive signal Vd1 and the second drive signal Vd2; Make following one-period the second induced signal Vh2 responsibility cycle can with the responsibility cycle identical (or approaching) of the first induced signal Vh1 of following one-period, promptly motor 10 is being rotated in the forward the (time that obtains forward drive current+Id) and the reverse rotation (time identical (or approaching) of acquisition reverse drive electric current-Id).
In other words; Motor drive 30 is to compensate with the first induced signal Vh1 and the second induced signal Vh2 that digital mode is responded to magnetoelastic transducer 20; It at first utilizes counting circuit 313 to count out the responsibility cycle (step S20) of the first digital signal Vg1 and the second digital signal Vg2; Again both are subtracted each other the gap (step S30) to learn responsibility cycle between two induced signals; Phase adjusting module 320 is again according to the responsibility cycle prolongation (step S40 and S50) of this gap with responsibility cycle smaller between the first digital signal Vg1 and the second digital signal Vg2; The responsibility cycle identical (or approaching) that makes the output signal Vo1 that wins is in the responsibility cycle of the second output signal Vo2; And then make motor 10 identical with the time of reverse rotation in the time that is rotated in the forward, the noise that produces with the operating efficiency that promotes motor 10 and when reducing its running.
In addition; Consult Fig. 7; Phase adjusting module 320 is the responsibility cycle that prolong the second digital signal Vg2 with the mode of delaying (delay) compensation; Promptly after the second digital signal Vg2 reduces to electronegative potential from high potential, again the second compensating signal Vc2 is superimposed to the second digital signal Vg2 and forms the second output signal Vo2.
Replacedly, phase adjusting module 320 also can shift to an earlier date the mode responsibility cycle that prolongs the second digital signal Vg2 of (early) compensation, and is as shown in Figure 8.Explain with above-mentioned example equally; In the single cycle; The responsibility cycle of the second digital signal Vg2 is the responsibility cycle less than the first digital signal Vg1; Therefore; Phase adjusting module 320 can the control first digital signal Vg1 when high potential is reduced to electronegative potential (time t0 ') and, the second compensating signal Vc2 is risen to high potential (time t1 ') from electronegative potential through behind one first scheduled time tp1, the time point that makes the second output signal Vo2 rise to high potential from electronegative potential will rise to the time point of high potential early than the second digital signal Vg2 from electronegative potential; So (t1 '-t2 ') will be greater than the responsibility cycle of the second digital signal Vg2 (t3-t2 ') responsibility cycle of the second output signal Vo2, and the first compensating signal Vc1 then maintains electronegative potential.
On the contrary; If the responsibility cycle of the first digital signal Vg1 is less than the responsibility cycle of the second digital signal Vg2; Then phase adjusting module 320 can be in the second digital signal Vg2 when high potential be reduced to electronegative potential and after through one second scheduled time; The first compensating signal Vc1 is risen to high potential from electronegative potential, the responsibility cycle of the digital signal Vg1 that wins can be extended, the second compensating signal Vc2 of this moment then maintains electronegative potential.
In the setting of present embodiment, first scheduled time tp1=(the second digital signal Vg2 in the single cycle be electronegative potential time-count difference value Ver)/N, N is the integer more than or equal to; Likewise, second the scheduled time=(the first digital signal Vg1 in the single cycle be electronegative potential time-count difference value Ver)/N, N is the integer more than or equal to, but does not exceed with above-mentioned setting.
In addition, phase adjusting module 320 also can be used simultaneously to delay compensation and compensate dual mode in advance and compensate, and details is all same as described above, so do not add to give unnecessary details.
Consult Fig. 3 and Fig. 9; Fig. 9 is second preferred embodiment of motor drive 30 of the present invention; In the present embodiment, motor drive 30 is to compensate with the first induced signal Vh1 and the second induced signal Vh2 that simulated mode is responded to magnetoelastic transducer 20.
Comparing unit 31 comprise one be coupled to magnetoelastic transducer 20 the first peak value fixture 315, be coupled to the second peak value fixture 316 of magnetoelastic transducer 20, and one be coupled to the first peak value fixture 315 and the second peak value fixture 316 peak comparator 317.In the present embodiment; The first peak value fixture 315 identical with the second peak value fixture 316 and be all low pass filter (low pass filter), rectifier, peak sensing device (peak detector) and peak holding circuit (peak hold circuit) one of them, but not as limit.
Compensating unit 32 comprise one be coupled to peak comparator 317 analog signal adjuster 323, be coupled to the first variable resistor group 326 of first change-over circuit 324 in order to first change-over circuit 324 that receives the first induced signal Vh1 that magnetoelastic transducer 20 produced, in order to second change-over circuit 325, that receives the second induced signal Vh2 that magnetoelastic transducer 20 produced, and one be coupled to second change-over circuit 325 the second adjustable resistance group 327.
The first variable resistor group 326 receives 323 controls of analog signal adjuster and changes its resistance value; And comprising the first variable resistor R1 that is coupled between the non-return end of a power supply Vdd and first change-over circuit 324 (operational amplifier), and one be coupled to the non-return end of first change-over circuit 324 and the second adjustable resistance R2 between the ground; The second adjustable resistance group 327 receives 323 controls of analog signal adjuster equally and changes its resistance value; And comprising the 3rd variable resistor R3 that is coupled between the backward end of the power supply Vdd and second change-over circuit 325, and one be coupled to the backward end of second change-over circuit 325 and the 4th variable resistor R4 between the ground.
Then cooperate and consult Figure 10, the motor drive 30 that specifies present embodiment is how to compensate the first induced signal Vh1 and the second induced signal Vh2, and the action of each circuit element and function.
Step S81, the first peak value fixture 315 and the second peak value fixture 316 receive the first induced signal Vh1 and the second induced signal Vh2 respectively, and detect the crest value of the first induced signal Vh1 and the second induced signal Vh2 respectively.
Step S82, peak comparator 317 be the difference between the crest value of crest value and the second induced signal Vh2 of the first induced signal Vh1 and produce one and can compensate one of them crest difference Vper of the first drive signal Vd1 and the second drive signal Vd2 relatively.
Step S83; Analog signal adjuster 323 produces the first simulation adjustment signal Vac1 relevant with the crest value of the first induced signal Vh1 according to the crest difference Vper of peak comparator 317 outputs, and the second simulation adjustment signal Vac2 relevant with the crest value of the second induced signal Vh2.
Step S84, the first variable resistor group 326 is simulated adjustment signal Vac2 according to the first simulation adjustment signal Vac1 and second respectively with the second adjustable resistance group 327 and is changed the resistance value of itself.
Step S85, first change-over circuit 324 and second change-over circuit 325 convert the first induced signal Vh1 and the second induced signal Vh2 to the first digital signal Vg1 and the second digital signal Vg2 of digital form respectively.
Cooperate and consult Figure 11; Is example with the crest value of the second induced signal Vh2 greater than the crest value of the first induced signal Vh1; Under the situation of identical charge and discharge speed, the responsibility cycle of the second digital signal Vg2 that the responsibility cycle of the first digital signal Vg1 that first change-over circuit 324 is produced can be produced greater than second change-over circuit 325.Therefore cooperate and consult Figure 12; Peak comparator 317 is after the difference that compares crest value between the first induced signal Vh1 and the second induced signal Vh2 (step S82); Analog signal adjuster 323 can reduce by the resistance value (step S83 and S84) of the first variable resistor R1 in the first variable resistor group 326 according to crest difference Vper; Make the crest value rising (shown in the dotted line of Figure 12) of the induced signal Vh1 that wins; So the responsibility cycle of the first digital signal Vg1 that first change-over circuit 324 is produced will be increased; So can identical with the responsibility cycle of the second digital signal Vg2 (or approaching), make motor 10 in the time that the is rotated in the forward purpose identical to reach with the time of reverse rotation.
What specify is; In the present embodiment, first change-over circuit 324 and second change-over circuit 325 are identical with first change-over circuit 311 and second change-over circuit 312 of first preferred embodiment, with first change-over circuit 324; Be that the first induced signal Vh1 and a reference voltage Vref are compared equally; If the voltage of the first induced signal Vh1 is greater than the voltage of reference voltage Vref, then the first digital signal Vg1 is high potential (digit one), then is electronegative potential (digit zero) on the contrary.
Step S86, driver element 33 is changed the first digital signal Vg1 and the second digital signal Vg2 and the corresponding first drive signal Vd1 of generation and the second drive signal Vd2.
Step S87; But switch unit 40 produces the drive current Id of CD-ROM drive motor 10 runnings according to the first drive signal Vd1 and the second drive signal Vd2, make following one-period the second induced signal Vh2 responsibility cycle can with the responsibility cycle identical (or approaching) of the first induced signal Vh1 of following one-period.The step S86 of present embodiment and S87 are identical with the step S60 and the S70 (Fig. 5) of first preferred embodiment, so do not giving unnecessary details.
Therefore; The motor drive 30 of present embodiment is directly to compare and compensate to the first induced signal Vh1 and the second induced signal Vh2 of analog form, just the first induced signal Vh1 and the second induced signal Vh2 is converted to the first digital signal Vg1 and the second digital signal Vg2 output of digital form afterwards; And the motor drive 30 of first preferred embodiment is the first first digital signal Vg1 and the second digital signal Vg2 that converts the first induced signal Vh1 and the second induced signal Vh2 of analog form to digital form; Just compare and compensate afterwards, so dual mode attainable cost effect of inventing all to the first digital signal Vg1 and the second digital signal Vg2.
Consult Fig. 3 and Figure 13; Figure 13 is the 3rd preferred embodiment of motor drive of the present invention; In the present embodiment, motor drive 30 is that the first induced signal Vh1 and the second induced signal Vh2 that uses simulation and digital mode that magnetoelastic transducer 20 is responded to simultaneously compensates.
Comparing unit 31 comprises that one is coupled to the counting circuit 313 of first change-over circuit 311 and second change-over circuit 312 in order to first change-over circuit 311 that receives the first induced signal Vh1 that magnetoelastic transducer 20 produced, in order to second change-over circuit 312, that receives the second induced signal Vh2 that magnetoelastic transducer 20 produced, and one be coupled to counting circuit 313 subtraction circuit 314.The comparing unit 31 of present embodiment is identical with the comparing unit 31 of first preferred embodiment, so do not add to give unnecessary details.
Compensating unit 32 comprises a digital signal adjuster 328, one first variable resistor group 329 and a second adjustable resistance group 330.Digital signal adjuster 328 is coupled to subtraction circuit 314, and it produces one first digital compensation signal Vdc1 and the one second digital compensation signal Vdc2 of corresponding count difference value Ver according to count difference value Ver; The first variable resistor group 329 is coupled to first change-over circuit 311, and receives first numeral to adjust signal Vdc1 and change its resistance value, changes the first digital signal Vg1 that first change-over circuit 311 is exported with correspondence; The second adjustable resistance group 330 is coupled to second change-over circuit 312, and receives second numeral to adjust signal Vdc2 and change its resistance value, changes the second digital signal Vdc2 that second change-over circuit 312 is exported with correspondence.
What specify is; The first variable resistor group 329 and the second adjustable resistance group 330 are identical with the first variable resistor group 326 and the second adjustable resistance group 327 of second preferred embodiment; Difference only is that the first variable resistor group 329 and the second adjustable resistance group 330 of present embodiment are the Digital Signals that exported by digital signal adjuster 328, and first variable resistor group 326 of second preferred embodiment and the second adjustable resistance group 327 are that the analog signal that exported by analog signal adjuster 323 is controlled.
Therefore; After the first induced signal Vh1 and the second induced signal Vh2 convert the first digital signal Vg1 and the second digital signal Vg2 to by first change-over circuit 311 and second change-over circuit 312; Counting circuit 313 and subtraction circuit 314 can calculate the gap of responsibility cycle (being count difference value Ver) between the two; Change the resistance value of the first variable resistor group 329 and the second adjustable resistance group 330 through digital signal adjuster 328 according to count difference value Ver more afterwards, so can make equally following one-period the second induced signal Vh2 responsibility cycle can with the responsibility cycle identical (or approaching) of the first induced signal Vh1 of following one-period.
In sum; Motor drive 30 of the present invention compares and compensates to the first induced signal Vh1 and the second induced signal Vh2 that magnetoelastic transducer 20 is induced by comparing unit 31 and compensating unit 32 wherein; Make that motor 10 can identical with the time in reverse rotation (or approaching) in the time that is rotated in the forward; So can promote the operating efficiency and the useful life of motor 10, and reduce the noise that electromagnetic generation and when running produce, so can reach the object of the invention really.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction; Though the present invention discloses as above with preferred embodiment; Yet be not in order to limiting the present invention, anyly be familiar with the professional and technical personnel, in not breaking away from technical scheme scope of the present invention; When the method for above-mentioned announcement capable of using and technology contents are made a little change or be modified to the equivalent embodiment of equivalent variations; In every case be the content that does not break away from technical scheme of the present invention, to any simple modification, equivalent variations and modification that above embodiment did, all still belong in the scope of technical scheme of the present invention according to technical spirit of the present invention.
Claims (18)
1. motor driven method; Be to be applied to a motor drive; This motor drive is to be used with a motor and a magnetoelastic transducer; This magnetoelastic transducer produces first induced signal of an expression S utmost point position of magnetic pole according to this motor operation, and second induced signal of an expression N utmost point position of magnetic pole, and this motor drive drives this motor operation according to this first induced signal and second induced signal; It is characterized in that:
Wherein said driving method comprises following steps:
(A) relatively this first induced signal and the responsibility cycle of this second induced signal between the last cycle are to obtain both responsibility cycle gaps;
(B), compensate the wherein responsibility cycle of responsibility cycle smaller's following one-period of this first induced signal and this second induced signal according to this responsibility cycle gap.
2. motor driven method according to claim 1 is characterized in that: wherein said step (A) comprises following substep:
(A-1) respectively this first induced signal and this second induced signal are converted to one first digital signal and one second digital signal of digital form;
(A-2) count to the responsibility cycle of this first digital signal and this second digital signal respectively, to produce one first count value and one second count value; And
(A-3) this first count value and this second count value are subtracted each other and produce the count difference value of responsibility cycle gap between this first induced signal of expression and this second induced signal.
3. motor driven method according to claim 2 is characterized in that: wherein said step (B) is to prolong the wherein responsibility cycle of responsibility cycle smaller's following one-period of this first induced signal and this second induced signal according to this count difference value.
4. motor driven method according to claim 3; It is characterized in that: in the wherein said step (B); In this first induced signal and this second induced signal responsibility cycle of responsibility cycle smaller's following one-period be prolong this count difference value 1/N doubly, N be greater than zero integer.
5. motor driven method according to claim 1 is characterized in that: wherein said step (A) is that the crest value with the crest value of this first induced signal and this second induced signal subtracts each other to produce the crest difference of responsibility cycle gap between this first induced signal of expression and this second induced signal each other.
6. motor driven method according to claim 5 is characterized in that: wherein said step (B) is to draw high wherein crest value smaller's crest value of this first induced signal and this second induced signal according to this crest difference.
7. motor driven method according to claim 6; It is characterized in that: in the wherein said step (B); This first induced signal and this second induced signal wherein the responsibility cycle of responsibility cycle smaller's following one-period be prolong this crest difference 1/N doubly, N is the integer more than or equal to.
8. motor drive; Be to be used with a motor and a magnetoelastic transducer; This magnetoelastic transducer produces first induced signal of an expression S utmost point position of magnetic pole according to this motor operation, and second induced signal of an expression N utmost point position of magnetic pole, it is characterized in that:
Wherein said motor drive comprises:
One driver element, according to corresponding one first drive signal and one second drive signal of producing of this first induced signal and second induced signal to drive this motor operation;
One comparing unit, the responsibility cycle in the last cycle of this first induced signal and this second induced signal relatively is to obtain both responsibility cycle gaps; And
One compensating unit is according to this responsibility cycle gap this first induced signal of compensation and this second induced signal responsibility cycle of responsibility cycle smaller's following one-period wherein.
9. motor drive according to claim 8 is characterized in that: wherein said comparing unit comprises:
One first change-over circuit receives this first induced signal that this magnetoelastic transducer produces, and converts this first induced signal one first digital signal of digital form to,
One second change-over circuit receives this second induced signal that this magnetoelastic transducer produces, and converts this second induced signal one second digital signal of digital form to,
One counting circuit is coupled to this first change-over circuit and this second change-over circuit, and counts to the responsibility cycle of this first digital signal and this second digital signal, to produce one first count value and one second count value, reaches
One subtraction circuit is coupled to this counting circuit, produces the count difference value of this responsibility cycle gap of expression in order to this first count value and this second count value are subtracted each other.
10. motor drive according to claim 9 is characterized in that: wherein said compensating unit is to prolong the wherein responsibility cycle of responsibility cycle smaller's following one-period of this first digital signal and this second digital signal according to this count difference value.
11. motor drive according to claim 10 is characterized in that: wherein said compensating unit comprises:
One phase adjusting module is coupled to this subtraction circuit, and it produces one first compensating signal and one second compensating signal that should count difference value according to this count difference value,
One first or lock; This first or two inputs of lock be respectively coupled to this first change-over circuit and this phase adjusting module; And this first or the output of lock be coupled to this driver element; This first or lock supply this driver element to produce the first output signal of this first drive signal according to this first digital signal and this first compensating signal output one, and
One second or lock; This second or two inputs of lock be respectively coupled to this change-over circuit and this phase adjusting module; And this second or the output of lock be coupled to this driver element, this second or lock supply this driver element to produce the second output signal of this second drive signal according to this second digital signal and this second compensating signal output one.
12. motor drive according to claim 11; It is characterized in that: when the responsibility cycle of wherein said first digital signal responsibility cycle less than this second digital signal; In the single cycle; When this first digital signal when high potential is reduced to electronegative potential, this first compensating signal rises to high potential from electronegative potential, this second compensating signal then maintains electronegative potential; When the responsibility cycle of this second digital signal responsibility cycle less than this first digital signal; In the single cycle; When this second digital signal when high potential is reduced to electronegative potential, this second compensating signal rises to high potential from electronegative potential, this first compensating signal then maintains electronegative potential.
13. motor drive according to claim 12; It is characterized in that: in the single cycle; The time that wherein said first compensating signal and described second compensating signal are high potential be for the 1/N of this count difference value doubly, N is the integer more than or equal to.
14. motor drive according to claim 11; It is characterized in that: when the responsibility cycle of wherein said second digital signal responsibility cycle less than described first digital signal; In the single cycle; When high potential is reduced to electronegative potential and after through one first scheduled time, this second compensating signal rises to high potential from electronegative potential, this first compensating signal then maintains electronegative potential in this first digital signal; When the responsibility cycle of described first digital signal responsibility cycle less than described second digital signal; In the single cycle; In this second digital signal when high potential is reduced to electronegative potential and after through one second scheduled time; This first compensating signal rises to high potential from electronegative potential, and this second compensating signal then maintains electronegative potential.
15. motor drive according to claim 14 is characterized in that: wherein said first the scheduled time=(this second digital signal in the single cycle for electronegative potential time-this count difference value)/N, N is the integer more than or equal to; This second the scheduled time=(this first digital signal in the single cycle be electronegative potential time-this count difference value)/N, N is the integer more than or equal to.
16. motor drive according to claim 8 is characterized in that: wherein said comparing unit comprises:
One first peak value fixture is detected the crest value of described first induced signal that described magnetoelastic transducer produces,
One second peak value fixture is detected the crest value of described second induced signal that described magnetoelastic transducer produces, and
One peak comparator; Be coupled to this first peak value fixture and this second peak value fixture, in order to the difference between the crest value of the crest value of this first induced signal relatively and this second induced signal and produce one and can compensate one of them crest difference of this first drive signal and this second drive signal.
17. motor drive according to claim 16 is characterized in that: wherein said compensating unit comprises:
One analog signal adjuster; Signal is adjusted in said crest difference generation one first simulation relevant with the crest value of said first induced signal according to described peak comparator output, and signal is adjusted in second simulation relevant with the crest value of said second induced signal;
One first change-over circuit receives this first induced signal that said magnetoelastic transducer produces, and this first induced signal is converted to one first digital signal of digital form according to a reference signal;
One second change-over circuit receives this second induced signal that said magnetoelastic transducer produces, and this second induced signal is converted to one second digital signal of digital form according to said reference signal;
One first variable resistor group is coupled to this first change-over circuit, and receives this first simulation to adjust signal and change its resistance value, changes this first digital signal with correspondence; And
One the second adjustable resistance group is coupled to this second change-over circuit, and receives this second simulation to adjust signal and change its resistance value, changes this second digital signal with correspondence.
18. motor drive according to claim 9 is characterized in that: wherein said compensating unit comprises:
One digital signal adjuster is coupled to this subtraction circuit, and it produces one first digital compensation signal and one second digital compensation signal that should count difference value according to this count difference value;
One first variable resistor group is coupled to this first change-over circuit, and receives this first numeral to adjust signal and change its resistance value, changes this first digital signal with correspondence;
One the second adjustable resistance group is coupled to this second change-over circuit, and receives this second numeral to adjust signal and change its resistance value, changes this second digital signal with correspondence.
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| JP2002176793A (en) * | 2000-09-18 | 2002-06-21 | Seiko Instruments Inc | Control circuit of brushless motor, control circuit of sensorless brushless motor, brushless motor device, sensorless brushless motor device, and vacuum pump equipment |
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| US5838128A (en) * | 1996-08-01 | 1998-11-17 | Sgs-Thomson Microelectronics S.R.I. | Reconstruction of BEMF signals for synchronizing the driving of brushless- sensorless motors by means of predefined driving signals |
| JP2002176793A (en) * | 2000-09-18 | 2002-06-21 | Seiko Instruments Inc | Control circuit of brushless motor, control circuit of sensorless brushless motor, brushless motor device, sensorless brushless motor device, and vacuum pump equipment |
| CN101546977A (en) * | 2008-03-27 | 2009-09-30 | 普诚科技股份有限公司 | Control device and driving method |
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