CN1329735C - Apparatus for testing rotating speed of asynchronous motor - Google Patents

Apparatus for testing rotating speed of asynchronous motor Download PDF

Info

Publication number
CN1329735C
CN1329735C CNB03135730XA CN03135730A CN1329735C CN 1329735 C CN1329735 C CN 1329735C CN B03135730X A CNB03135730X A CN B03135730XA CN 03135730 A CN03135730 A CN 03135730A CN 1329735 C CN1329735 C CN 1329735C
Authority
CN
China
Prior art keywords
winding
transistor
capacitor
resistance
asynchronous motor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CNB03135730XA
Other languages
Chinese (zh)
Other versions
CN1591022A (en
Inventor
蔡士齐
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sichuan hope deep blue energy Chemical Co., Ltd.
Original Assignee
XIWANG ELECTRONIC RESEARCH INST CHENGDU CITY
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by XIWANG ELECTRONIC RESEARCH INST CHENGDU CITY filed Critical XIWANG ELECTRONIC RESEARCH INST CHENGDU CITY
Priority to CNB03135730XA priority Critical patent/CN1329735C/en
Publication of CN1591022A publication Critical patent/CN1591022A/en
Application granted granted Critical
Publication of CN1329735C publication Critical patent/CN1329735C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

The present invention discloses a device for testing the rotary speed of an asynchronous motor. The device is composed of choke coils RF<U>, RF<V>, RF<W>, an oscillator OSC, transformers B1, B2, capacitors C 1, C 2, C 3, C4, resistors R 1, R3, R 4, R 5, R 6, a potentiometer R 2, transistors T 1, T2 and a tachometer ZS, wherein the three choke coils are respectively connected between a three-phase power line and the input power end of the asynchronous motor in series. The single-phase AC with high frequency of the oscillator and the transformer B1 are applied to two windings of the motor. The signal relative to the rotary speed is obtained from the other winding of the motor. Through the transformer B 2 and a circuit kit, the signal carries out the phase-sensitive detection to obtain the DC voltage in the direct proportion to the rotary speed of the asynchronous motor. The DC voltage can obtain the indication in the tachometer and can be output as the rotary speed signal. The device does not need to install any rotary components on inner and outer parts of the asynchronous motor. The rotary speed of the asynchronous motor can be quickly detected without any changes to the asynchronous motor.

Description

A kind of device of measuring asynchronous motor speed
Affiliated technical field
The present invention relates to the motor speed measurement device, particularly measure the device of asynchronous motor speed.
Background technology
Before the present invention did not occur, the tachometric survey of asynchronous motor all need just might realize under the situation that asynchronous motor is changed to some extent by means of asynchronous motor inside or outside certain device that tests the speed of installing.For example on the axle of asynchronous motor, rotary encoder or tech-generator or the like are installed.Yet this extra installation is very inconvenient, can not obtain the welcome of user and installation side.So the rotating speed that certain new method is calculated asynchronous motor indirectly occurred.In the Frequency Converter Control technology, a kind of what is called " vector control technology of Speedless sensor " is arranged, and this is to adopt the motor parameter of setting in advance, records behind the electric current, voltage, frequency, phase place of motor to calculate through single-chip microcomputer and extrapolate the tachometer value of asynchronous motor.The accuracy of this mode is not high, directly perceived, can not use at all occasions, and basically this is a kind of ancillary technique in the vector control technology, rather than testing the speed truly.
Summary of the invention
The purpose of this invention is to provide and a kind ofly any parts need be installed, asynchronous motor is not done under the situation of any change, measure the device of asynchronous motor speed simply, apace in the asynchronous motor inside and outside.
In order to achieve the above object, the solution of the present invention is: a kind of device of measuring asynchronous motor speed, it is by choking coil RF U, choking coil RF V, choking coil RF W, oscillator OSC, transformer B 1, transformer B 2, capacitor C 1, capacitor C 2, capacitor C 3, capacitor C 4, resistance R 1, potentiometer R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, transistor T 1, transistor T 2Form with tachometer gage ZS; Transformer B 1By former limit winding L 11, symmetry pay the limit winding L 12And L 13And pair limit winding L 14Form; Transformer B 2By former limit winding L 21, symmetry pay the limit winding L 22And L 23Form; Choking coil RF UThe U phase input end of a termination three-phase alternating-current supply, another termination capacitor C 1An end after form U phase output terminal U 1, choking coil RF VThe V phase input end of a termination three-phase alternating-current supply, another termination capacitor C 3An end after form V phase output terminal V 1, choking coil RF WThe W phase input end of a termination three-phase alternating-current supply, another termination capacitor C 2An end after form W phase output terminal W 1U phase output terminal U 1, V phase output terminal V 1With W phase output terminal W 1Meet three connection terminal A, B and the C of tested asynchronous motor respectively; Capacitor C 1Another termination winding L 12An end, capacitor C 2Another termination winding L 13An end, winding L 12The other end and winding L 13The other end join and form mid point O 1Connect winding L 21An end, winding L 21Another termination capacitor C 3The other end; Winding L 11Two output terminals 1,2 of two termination oscillator OSC, two power end R, the N of oscillator OSC connect civil power; Winding L 22And winding L 23The node of series connection connects common port E, winding L 22Other end connecting resistance R 3An end and transistor T 2Collector, winding L 23Other end connecting resistance R 1An end and transistor T 1Collector, resistance R 1Another termination potentiometer R 2Stiff end and transistor T 1Base stage, resistance R 3Another termination potentiometer R 2Another stiff end and transistor T 2Base stage, potentiometer R 2Sliding end connecting resistance R 4An end, resistance R 4Another termination winding L 14An end, winding L 14Another termination transistor T 1Emitter, transistor T 2Emitter, resistance R 5And resistance R 6, resistance R 5Another termination capacitor C 4With the end of tachometer gage ZS, resistance R 6Another termination capacitor C 4The other end after connect the other end that common port E meets tachometer gage ZS again.
Because this device only is connected on the actual speed that just can measure asynchronous motor between three input power cords and the asynchronous motor, therefore, this device has changed the method for conventional measurement asynchronous motor speed, can be simply, convenient, the rotating speed of monitoring asynchronous motor reliably at any time.
Description of drawings
The present invention is described in further detail below in conjunction with drawings and Examples:
Fig. 1 is circuit theory diagrams of the present invention
Fig. 2 is the graph of a relation of this device output dc voltage and rotating speed.
Embodiment
As shown in Figure 1, a kind of device of measuring asynchronous motor speed, it is by choking coil RF U, choking coil RF V, choking coil RF W, oscillator OSC, transformer B 1, transformer B 2, capacitor C 1, capacitor C 2, capacitor C 3, capacitor C 4, resistance R 1, potentiometer R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, transistor T 1, transistor T 2Form with tachometer gage ZS; Transformer B 1By former limit winding L 11, symmetry pay the limit winding L 12And L 13And pair limit winding L 14Form; Transformer B 2By former limit winding L 21, symmetry pay the limit winding L 22And L 23Form; Choking coil RF UThe U phase input end of a termination three-phase alternating-current supply, another termination capacitor C 1An end after form U phase output terminal U 1, choking coil RF vThe V phase input end of a termination three-phase alternating-current supply, another termination capacitor C 3An end after form V phase output terminal V 1, choking coil RF WThe W phase input end of a termination three-phase alternating-current supply, another termination capacitor C 2An end after form W phase output terminal W 1U phase output terminal U 1, V phase output terminal V 1With W phase output terminal W 1Meet three connection terminal A, B and the C of tested asynchronous motor respectively; Capacitor C 1Another termination winding L 12An end, capacitor C 2Another termination winding L 13An end, winding L 12The other end and winding L 13The other end join and form mid point O 1Connect winding L 21An end, winding L 21Another termination capacitor C 3The other end; Winding L 11Two output terminals 1,2 of two termination oscillator OSC, two power end R, the N of oscillator OSC connect civil power; Winding L 22And winding L 23The node of series connection connects common port E, winding L 22Other end connecting resistance R 3An end and transistor T 2Collector, winding L 23Other end connecting resistance R 1An end and transistor T 1Collector, resistance R 1Another termination potentiometer R 2Stiff end and transistor T 1Base stage, resistance R 3Another termination potentiometer R 2Another stiff end and transistor T 2Base stage, potentiometer R 2Sliding end connecting resistance R 4An end, resistance R 4Another termination winding L 14An end, winding L 14Another termination transistor T 1Emitter, transistor T 2Emitter, resistance R 5And resistance R 6, resistance R 5Another termination capacitor C 4With the end of tachometer gage ZS, resistance R 6Another termination capacitor C 4The other end after connect the other end that common port E meets tachometer gage ZS again.
Principle of the present invention is as follows: (see figure 1)
As everyone knows, three of threephase asynchronous winding L AO, L BO, L COBe mutually 120 ° of electrical angles in the space, if winding L AO, L COPass to single-phase alternating current, because of winding L AO, L COSynthetic space magnetic field and winding L BOVertically, can be in winding L BOIn induce electromotive force.Yet, when the conductor of rotor is subjected to winding L because of the rotor rotation AO, L COWhen cut the resultant magnetic field, magnetic flux and winding L that this cutting current forms AO, L COSynthetic space magnetic flux is vertical, just in time is coupled to winding L BOSo, in winding L BOOn induce and the corresponding electromotive force that tests the speed of motor speed size, this is exactly the principle of indusction tachometer generator in itself.
Yet the asynchronous motor that is studied is the asynchronous motor that passes to normal three-phase alternating current, rather than tachometer.Main points of the present invention are to allow this asynchronous motor feedback with lower frequency f 1Three-phase alternating current make motor operation and use, present simultaneously with the higher f of frequency 2Single-phase alternating current make tachometer and use, both on circuit dexterously not only in conjunction with but also irrelevant disturbing, thereby reach the purpose that tests the speed.This just a kind of carrier frequency mode is measured the method for the dynamic rotating speed of asynchronous motor.It is real-time, does not sample, and therefore can be applicable to various occasions.
I, II, III three parts (as dotted line among Fig. 1) of basic composition is of the present invention, part i is three identical choking coil RF U, RF V, RF W, being placed between three-phase drive power lead U, V, W and motor wiring terminal A, B, the C, the impedance of choking coil is to the driving power frequency f 1Impedance little, make the voltage landing of supplying with motor M very little; Yet carrier frequency f to oscillator OSC feed-in 2Very big impedance is arranged, because carrier frequency f 2Use supply frequency f than driving 1Height is a lot, and is for example high 10～100 times, like this carrier frequency f 2Electric current isolated, almost can not enter U, V, W mains side.
Part ii is carrier frequency power supply and output transformer, and it is f that an oscillator OSC produces frequency 2The sine-wave oscillation signal, be added to output transformer B 1Former limit winding L 11On, the power supply of this oscillator is received on the civil power by R, N terminal; Transformer B 1The limit of paying winding L is arranged 14With two groups of identical and symmetrical winding L 12And L 13, winding L 12And L 13Center tap be O 1, pay the limit winding L 12And L 13Voltage through two identical low capacity capacitor C 1, C 2, receive on motor wiring terminal A and the C.Like this, the signal frequency f of oscillator OSC generation 2Voltage be added in the motor winding L AOAnd L COBetween.Winding L 12, L 13Symmetry is identical, capacitor C 1With capacitor C 2Also equate the motor winding L AOAnd L COAlso be impedance phase with, at this moment the winding mid point O of motor M and transformer B 1Pay limit winding mid point O 1Do not have potential difference (PD), can think O 1Point is exactly the virtual voltage potential point that O is ordered.So just can derive motor winding B point and transformer B 1Pay the limit winding L 12And L 13Centre tap O 1Between voltage, equal the motor winding L BOBetween voltage.When motor does not rotate, though winding L AO, L COBe mutually 120 °, but their resultant fluxs and winding L BOVertically, so winding L BOOn do not have induced potential.When rotor rotates, rotor conductor cutting winding L AO, L COResultant flux, produce induced current, the magnetic flux that this induced current constitutes just in time with winding L BOSo coupling is winding L BOElectromotive force output is just arranged.Winding L BOLast electromotive force size is directly proportional with the motor rotor rotating speed, and frequency is with the motor winding L AO, L COIn the power frequency f that flows through 2Unanimity, phase place turns to corresponding with rotor.When being switched in opposite, winding L BOThe output voltage phase place opposite, winding L like this BOVoltage has reacted the rotating speed of motor in real time and has turned to.
III partly is a phase-sensitive detection circuit, wherein transformer B 2Winding L 21By a little capacitor C 3Receive motor winding B termination and transformer B 1Pay limit winding center tap O 1On.Because winding L 21On voltage equal winding L BOOn voltage, and winding L BOVoltage be to have reacted the rotating speed of motor and the value that turns to, therefore flow through Transformer Winding L 21Current response motor M rotating speed and turn to.
Transformer B 2Pay the limit winding L 22, L 23With complementary transistor T 1, T 2, potentiometer R 2, resistance R 1, R 3, R 4, R 5And R 6, capacitor C 4Constitute phase-sensitive detection circuit.A reference phase voltage is from transformer B 1Another one pay the limit winding L 14On draw and receive resistance R 4, again by potentiometer R 2Be added to complementary transistor to T 1, T 2Base stage on, resistance R 1, R 3Resistance is identical, they and potentiometer R 2Resistance make transistor T 1, T 2The working point is rationalized.Transformer B 2Pay the limit winding L 22And L 23Symmetry is identical fully, and its tie point is that mid point meets common port E.
When certain in a flash, winding L 14Voltage make transistor T 1During the base stage conducting, if this moment T 1Current collection very just, promptly emitter just has output, finally through resistance R 5, capacitor C 4Filtering just has the output of DC voltage forward, and its amplitude is directly proportional with motor speed.
When motor reversed, certain is L in a flash 14Voltage make T 1The base stage conducting, but this moment transistor T 1The voltage of collector is for negative, and its emitter is not output just.Subsequent lower half winding L 14Voltage become negative, make transistor T 2The base stage conducting, and this moment winding L 22Output makes transistor T 2Current collection is negative voltage very; Make transistor T 2Emitter negative output is arranged, finally through resistance R 5, capacitor C 4Filtering just has negative DC voltage output, and its amplitude is directly proportional with motor speed, its polarity negative reaction motor counter-rotating.
Complementary transistor T 1And T 2Should be symmetrical, work as transistor T 1When managing for NPN, transistor T 2Must manage for PNP; Work as transistor T 1When managing for PNP, transistor T 2Must be for NPN manage, T as shown in Figure 1 1Be NPN pipe, T 2Be the PNP pipe.
The strict reference frequency f that obeys of this phase sensitive detection 2Control, any is not f 2The signal of frequency can not be detected; Even any interference certain moment is detected, but the polarity that another moment detects may be opposite, finally because of resistance R 5, capacitor C 4The alternating component character disturbed of effect smoothed, obtaining at the output terminal that tests the speed is DC voltage.And this DC voltage is real f 2The ability of frequency is by the DC voltage of phase sensitive detection, and this DC voltage is directly proportional with the rotating speed of tested motor M, and its polarity turns to relevant (see figure 2) with motor.
Another advantage of phase sensitive detection is to have overcome the f that exists in this circuit 1The interference of frequency signal.The f1 frequency signal is very powerful in the circuit, winding L BOLast f 1The voltage of frequency because of can not with f 2Frequency signal can not be detected by phase sensitive detection synchronously, also is that phase sensitive detection only detects f 2The signal of frequency, this f 2Frequency signal is with motor M rotating speed and turn to relevant.
In order further to reduce f 1The frequency signal composition is to f 2The influence of frequency signal composition, the capacitor C in this circuit 1, C 2, C 3All be the less electric capacity of capacity, make f 2The impedance of frequency signal is little, to f 1The impedance of frequency signal is big, and f effectively decays 1Voltage to frequency reduces f 1Frequency signal is to the influence of measured value.
The f of common oscillator OSC feed-in 2Frequency signal is at least driving power f 110 times to 100 times of frequency signal are because of frequency differs the influence that can weaken effectively more between the two far away more.f 2Frequency signal is delivered to the motor winding L AO, L COOn enough amplitudes will be arranged, to improve the signal to noise ratio (S/N ratio) of this detection scheme.
Potentiometer R 2Can accurately adjust to static state and test the speed and be output as zero, to reduce the error of zero, this application to this circuit is very important.The f of same oscillator OSC feed-in 2The output of frequency signal will have good range stability, because any f 2The voltage amplitude variation of frequency signal all will have influence on the output valve that tests the speed.Choking coil RF U, RF V, RF WCan not omit, and requirement is to the frequency f of oscillator OSC feed-in 2Signal forms enough decay, otherwise frequency f 2The electric current of signal can enter frequency f 1Driving power in go.
Use output dc voltage that this speed measuring device records and the conversion reading value between the rotating speed after device is finished, to calibrate, Calibration Method can be to adjust oscillator OSC output amplitude size, perhaps in the output terminal that tests the speed potentiometer adjustment, make tested motor speed and VD relation in direct ratio.
The tachometer gage ZS that this device uses can reequip with D.C. voltmeter, and dial plate central authorities are 0, the right be on the occasion of, the left side is a negative value, its positive and negative value representation motor sense of rotation, amplitude is represented rotating speed.When tested asynchronous motor during in rated speed, the indication of D.C. voltmeter should be maximal value, and when tested asynchronous motor stall, the indication of D.C. voltmeter should be 0.
When this speed measuring device uses as tachometric survey output, in capacitor C 4Two ends needn't meet tachometer gage ZS, and as output, feedback voltage uses as testing the speed the two ends F, the G that meet tachometer gage ZS.
Great advantage of the present invention is needn't be at any rotatable parts of the inner or outside installation of asynchronous motor, to the requirement of this point is any one user and the control personnel that test the speed are desirable automatically, this can be to realizing the automatic control of asynchronous motor, and particularly variable frequency regulating speed control is brought great convenience.

Claims (8)

1. device of measuring asynchronous motor speed, it is made up of tachometer gage ZS, it is characterized in that: it also has choking coil RF U, choking coil RF V, choking coil RF W, oscillator OSC, transformer B 1, transformer B 2, capacitor C 1, capacitor C 2, capacitor C 3, capacitor C 4, resistance R 1, potentiometer R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, transistor T 1And transistor T 2Form; Transformer B 1By former limit winding L 11, symmetry pay the limit winding L 12And L 13And pair limit winding L 14Form; Transformer B 2By former limit winding L 21, symmetry pay the limit winding L 22And L 23Form; Choking coil RF UThe U phase input end of a termination three-phase alternating-current supply, another termination capacitor C 1An end after form U phase output terminal U 1, choking coil RF VThe V phase input end of a termination three-phase alternating-current supply, another termination capacitor C 3An end after form V phase output terminal V 1, choking coil RF WThe W phase input end of a termination three-phase alternating-current supply, another termination capacitor C 2An end after form W phase output terminal W 1U phase output terminal U 1, V phase output terminal V 1With W phase output terminal W 1Meet three connection terminal A, B and the C of tested asynchronous motor respectively; Capacitor C 1Another termination winding L 12An end, capacitor C 2Another termination winding L 13An end, winding L 12The other end and winding L 13The other end join and form mid point O 1Connect winding L 21An end, winding L 21Another termination capacitor C 3The other end; Winding L 11Two output terminals (1), (2) of two termination oscillator OSC, two power end R, the N of oscillator OSC connect civil power; Winding L 22And winding L 23The node of series connection connects common port E, winding L 22Other end connecting resistance R 3An end and transistor T 2Collector, winding L 23Other end connecting resistance R 1An end and transistor T 1Collector, resistance R 1Another termination potentiometer R 2Stiff end and transistor T 1Base stage, resistance R 3Another termination potentiometer R 2Another stiff end and transistor T 2Base stage, potentiometer R 2Sliding end connecting resistance R 4An end, resistance R 4Another termination winding L 14An end, winding L 14Another termination transistor T 1Emitter, transistor T 2Emitter, resistance R 5And resistance R 6, resistance R 5Another termination capacitor C 4With the end of tachometer gage ZS, resistance R 6Another termination capacitor C 4The other end after connect the other end that common port E meets tachometer gage ZS again.
2. the device of measurement asynchronous motor speed according to claim 1 is characterized in that: the oscillation frequency of described oscillator OSC is U, V, W end driving power frequency 10-100 a times.
3. the device of measurement asynchronous motor speed according to claim 1 is characterized in that: described tachometer gage ZS is a D.C. voltmeter, and its polarity represents that motor turns to, and amplitude is represented rotating speed; When doing to observe without tachometer gage ZS, this two ends G, F that meets tachometer gage ZS can be used as the feedback voltage that tests the speed to be used.
4. the device of measurement asynchronous motor speed according to claim 1 is characterized in that: described transistor T 1And transistor T 2For the NPN-PNP complementary transistor right; Promptly work as transistor T 1When managing for NPN, transistor T 2Must manage for PNP; Work as transistor T 1When managing for PNP, transistor T 2Must manage for NPN.
5. the device of measurement asynchronous motor speed according to claim 1 is characterized in that: described choking coil RF U, choking coil RF VWith choking coil RF WIdentical, and to frequency f 1Impedance is little, to frequency f 2Impedance is big.
6. the device of measurement asynchronous motor speed according to claim 1 is characterized in that: described winding L 12, winding L 13Identical, O 1Be central point.
7. the device of measurement asynchronous motor speed according to claim 1 is characterized in that: described winding L 22, winding L 23Identical, common port E is a central point.
8. the device of measurement asynchronous motor speed according to claim 1 is characterized in that: described capacitor C 1, capacitor C 2Electric capacity is identical; And capacitor C 1, C 2, C 3To frequency f 1Impedance is big, to frequency f 2Impedance is little.
CNB03135730XA 2003-09-02 2003-09-02 Apparatus for testing rotating speed of asynchronous motor Expired - Fee Related CN1329735C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB03135730XA CN1329735C (en) 2003-09-02 2003-09-02 Apparatus for testing rotating speed of asynchronous motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB03135730XA CN1329735C (en) 2003-09-02 2003-09-02 Apparatus for testing rotating speed of asynchronous motor

Publications (2)

Publication Number Publication Date
CN1591022A CN1591022A (en) 2005-03-09
CN1329735C true CN1329735C (en) 2007-08-01

Family

ID=34597212

Family Applications (1)

Application Number Title Priority Date Filing Date
CNB03135730XA Expired - Fee Related CN1329735C (en) 2003-09-02 2003-09-02 Apparatus for testing rotating speed of asynchronous motor

Country Status (1)

Country Link
CN (1) CN1329735C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8786499B2 (en) 2005-10-03 2014-07-22 Pulse Finland Oy Multiband antenna system and methods

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106533317B (en) * 2016-11-30 2020-06-02 中冶西北工程技术有限公司 Rotary table positioning method and system
CN110470857B (en) * 2019-09-08 2021-04-13 陕西航空电气有限责任公司 Rotating speed detection method suitable for aviation power system generator

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN85104725A (en) * 1985-06-19 1986-12-17 东芝机械株式会社 The speed control unit of synchronous motor
CN2063644U (en) * 1989-11-15 1990-10-10 浙江省机电设计研究院 Intelligence slip and revolution meter
RU1793379C (en) * 1988-11-30 1993-02-07 Могилевский Машиностроительный Институт Device for measuring rotation speed of asynchronous electric motor with short-circuited rotor
JPH08262044A (en) * 1995-03-24 1996-10-11 Oriental Motor Co Ltd Signal detection circuit of tachogenerator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN85104725A (en) * 1985-06-19 1986-12-17 东芝机械株式会社 The speed control unit of synchronous motor
RU1793379C (en) * 1988-11-30 1993-02-07 Могилевский Машиностроительный Институт Device for measuring rotation speed of asynchronous electric motor with short-circuited rotor
CN2063644U (en) * 1989-11-15 1990-10-10 浙江省机电设计研究院 Intelligence slip and revolution meter
JPH08262044A (en) * 1995-03-24 1996-10-11 Oriental Motor Co Ltd Signal detection circuit of tachogenerator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8786499B2 (en) 2005-10-03 2014-07-22 Pulse Finland Oy Multiband antenna system and methods

Also Published As

Publication number Publication date
CN1591022A (en) 2005-03-09

Similar Documents

Publication Publication Date Title
US4321529A (en) Power factor metering device
CN100394199C (en) Direct current sensor
US7750663B2 (en) Method and apparatus for testing an electronic motor
US9035675B2 (en) Method and device for off-line testing of electric motors
CN103743961A (en) Open-phase detection method and detection apparatus for three-phase permanent magnet synchronous motor
CN106481617A (en) A kind of hydraulic motor test platform and method of testing
JPH05188096A (en) Current detector of semiconductor controller for motor
CN112444746B (en) Motor integrated test system
CN100568706C (en) Measure the method for induction motor angular speed
US4150358A (en) Temperature measuring system for rotating machines
CN1329735C (en) Apparatus for testing rotating speed of asynchronous motor
CN109655182A (en) A kind of electric motor starting output shaft torque simple system of measuring and measurement method
CN202486258U (en) Portable three-phase motor winding tester
CN102735381A (en) Locked-rotor torque detection device and method for three-phase permanent magnet synchronous motor
US2481196A (en) Speed responsive device
CN209342145U (en) A kind of new energy motor performance test system
CN204405720U (en) The sample circuit of frequency converter and frequency converter
CN105469966A (en) Rotary transformer
CN106443567A (en) Real-load test system for electric energy meters
CN101162242B (en) Method for testing direct current by quadrature transformer
RU2670715C9 (en) Stand for testing ac and dc motors
CN103941201A (en) Measuring method of magnetic parameters of magnetic material
CN112484633B (en) Device and method for measuring quadrature error of torquer coil
CN106208870A (en) A kind of hybrid exciting synchronous motor magnetic linkage measuring method
Jun et al. Research and design of a new type of high current bidirectional hall current sensor

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
ASS Succession or assignment of patent right

Owner name: SICHUAN HOPE THAT THE DARK BLUE AND POWER CO. LTD

Free format text: FORMER OWNER: CHENGDU HOPE ELECTRONIC RESEARCH INSTITUTE

Effective date: 20071207

C41 Transfer of patent application or patent right or utility model
TR01 Transfer of patent right

Effective date of registration: 20071207

Address after: Sichuan province Chengdu City West Port Development Zone Shuangliu Airport Road No. 181

Patentee after: Sichuan Hope Deep Blue Power Co., Ltd.

Address before: No. 181, Airport Road, Sichuan, Chengdu

Patentee before: Xiwang Electronic Research Inst. Chengdu City

EE01 Entry into force of recordation of patent licensing contract

Assignee: Hope deep blue Polytron Technologies Inc

Assignor: Sichuan Hope Deep Blue Power Co., Ltd.

Contract fulfillment period: 2008.5.6 to 2013.5.6 contract change

Contract record no.: 2009510000110

Denomination of invention: Apparatus for testing rotating speed of asynchronous motor

Granted publication date: 20070801

License type: Exclusive license

Record date: 20091020

LIC Patent licence contract for exploitation submitted for record

Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2008.5.6 TO 2013.5.6; CHANGE OF CONTRACT

Name of requester: HOPE SHENLAN SCIENCE AND TECHNOLOGY CO., LTD.

Effective date: 20091020

C56 Change in the name or address of the patentee

Owner name: SICHUAN XIWANG SHENLAN ENERGY CHEMICAL CO., LTD.

Free format text: FORMER NAME: SICHUAN HOPE THAT THE DARK BLUE AND POWER CO. LTD.

CP01 Change in the name or title of a patent holder

Address after: 610000 Sichuan city in Chengdu Province West Port Development Zone Shuangliu Airport Road No. 181

Patentee after: Sichuan hope deep blue energy Chemical Co., Ltd.

Address before: 610000 Sichuan city in Chengdu Province West Port Development Zone Shuangliu Airport Road No. 181

Patentee before: Sichuan Hope Deep Blue Power Co., Ltd.

C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20070801

Termination date: 20120902