EP1373728A1 - Driving controlling apparatus for reciprocating compressor - Google Patents

Driving controlling apparatus for reciprocating compressor

Info

Publication number
EP1373728A1
EP1373728A1 EP01934583A EP01934583A EP1373728A1 EP 1373728 A1 EP1373728 A1 EP 1373728A1 EP 01934583 A EP01934583 A EP 01934583A EP 01934583 A EP01934583 A EP 01934583A EP 1373728 A1 EP1373728 A1 EP 1373728A1
Authority
EP
European Patent Office
Prior art keywords
stroke
motor
voltage
reciprocating
inductance
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.)
Granted
Application number
EP01934583A
Other languages
German (de)
French (fr)
Other versions
EP1373728B1 (en
EP1373728A4 (en
Inventor
Jae-Yoo Yoo
Gye-Young Song
Kyung-Bum Hur
Hyeong-Kook Lee
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.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
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 LG Electronics Inc filed Critical LG Electronics Inc
Publication of EP1373728A1 publication Critical patent/EP1373728A1/en
Publication of EP1373728A4 publication Critical patent/EP1373728A4/en
Application granted granted Critical
Publication of EP1373728B1 publication Critical patent/EP1373728B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • F04B35/045—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric using solenoids

Definitions

  • the present invention relates a driving controlling apparatus of a reciprocating compressor using resonance, and more particularly, to a driving controlling apparatus of a reciprocating compressor using resonance with high current counteracting characteristics by offsetting an inductance value of a coil wound inside a motor by employing a capacitor.
  • the rotor can be stopped at a certain position, and by controlling a phase of an input pulse signal applied to the switching device by taking a maximum inductance as a starting point, a reverse-rotational force can be generated
  • the reciprocating compressor is adopted for use to electric products requiring a direction control of the motor.
  • a compression ratio can be varied by a voltage applied to the motor, and accordingly, a cooling force can be varied according to a user's intention.
  • Figure 1 is a block diagram showing the construction of a driving controlling apparatus of a general reciprocating compressor.
  • the general reciprocating compressor includes: a reciprocating compressing unit (L.CO P) for varying a stroke by piston's movement to control a cooling force by a voltage applied to an internal motor according to a stroke command value; a voltage detector 30 for detecting a voltage generated at the reciprocating compressing unit (L.COMP) as the stroke is increased by the applied voltage; a current detector 20 for detecting a current applied to the reciprocating compressing unit (L.COMP) as the stroke is increased by the applied voltage; a microcomputer 40 for calculating a stroke with the voltage and the current detected by the voltage detector 30 and the current detector 20, comparing the stroke with the stroke command value and outputting a corresponding switching control signal; and an electric circuit unit 10 for switching off an AC power with a t ⁇ ' ac according to the switching control signal of the microcomputer 40 to apply a voltage to the reciprocating compressing unit (L.COMP).
  • a reciprocating compressing unit L.CO P
  • a voltage detector 30 for detecting a voltage generated at the reciproc
  • the piston is moved by the voltage applied according to the stroke command value set by a user, and accordingly, a stroke is varied to control a cooling force.
  • the microcomputer 40 calculates a stroke by using the voltage and current detected by the voltage detector 30 and the current detector 20.
  • the stroke is compared with the stroke command value to output a corresponding switching control signal.
  • the microcomputer 40 outputs a switching control signal for lengthening the ON period of the triac (Tr1) in order to increase the voltage applied to the reciprocating compressing unit (L.COMP).
  • the microcomputer 40 If, however, the calculated stroke is greater than the stroke command value, the microcomputer 40 outputs a switching control signal for shortening
  • V L — + R 'i + a - S (1 ) dt
  • ⁇ indicates a motor constant for converting an electric force to a
  • S indicates a stroke
  • 'R' is a internal resistance of the motor
  • 'L' indicates an inductance of the motor (M) itself.
  • the inductance voltage (L — ) is almost similar to a back electromotive dt
  • the voltage (V) applied to the motor (M) is determined by
  • the motor should be increased.
  • the inductance (L) value of the coil wound on the motor (M) itself should be small, and the inductance (L) value of the coil becomes small as the size of the motor (magnet) is increased.
  • the size of the mover the thickness of the magnet
  • an air gap is increased, causing a problem that the overall size and cost of the reciprocating compressor is increased.
  • the size of the mover (the thickness of the magnet) is reduced, the inductance (L) value of the coil wound at the motor (M) is increased. Then, the current according to the voltage value for the stroke control of the reciprocating compressor would slowly work, so that the stroke is not smoothly controlled.
  • an object of the present invention is to provide a driving controlling apparatus of a reciprocating compressor which has an excellent current counteracting capacity by offsetting a quality which slows current operation characteristics as an inductance value of a coil wound inside a motor is increased by employing a capacitor.
  • a driving controlling apparatus of a reciprocating compressor having a reciprocating compressing unit controlling a cooling force by varying a stroke according to a piston's movement by a voltage applied to an internal motor according to a stroke command value and an electric circuit unit for switching an AC power with a triac and applying it to the motor of the reciprocating compressing unit, wherein the electric circuit unit includes a capacitor for offsetting an inductance of a coil wound at a motor itself of the reciprocating compressing unit.
  • Figure 1 is a block diagram showing the construction of a driving controlling apparatus of a conventional reciprocating compressor.
  • Figure 2 is a block diagram showing the construction of a driving controlling apparatus of a reciprocating compressor using a resonance according to the present invnetion.
  • Figure 2 is a block diagram showing the construction of a driving controlling apparatus of a reciprocating compressor using a resonance according to the present invnetion.
  • a driving controlling apparatus of a reciprocating compressor includes: a reciprocating compressing unit (L.COMP) for varying a stroke by piston's movement to control a cooling force by a voltage applied to an internal motor according to a stroke command value; a voltage detector 30 for detecting a voltage generated at the reciprocating compressing unit (L.COMP) as the stroke is increased by the applied voltage; a current detector 20 for detecting a current applied to the reciprocating compressing unit (L.COMP) as the stroke is increased by the applied voltage; a microcomputer
  • an electric circuit unit 10 having a capacitor (C) to offset an inductance of a coil (L) wound at the motor (M) itself of the reciprocating compressing unit (L.COMP) and switching off an AC power with a triac according to the switching control signal of the microcomputer 40 to apply a voltage to the reciprocating compressing unit (L.COMP).
  • the piston is moved by an applied voltage according to a stroke command value set by a user, and accordingly, a stroke is varied to control a cooling force.
  • the microcomputer 40 calculates a stroke by using the voltage
  • the stroke is compared with the stroke command value to output a corresponding switching control signal.
  • the capacitor (C) is connected in series to the motor (M) to offset an inductance (L) of a coil wound at the motor (M), which will now be described in detail.
  • a capacitance can be set by the following equation (3):
  • the capacitance (C) and the inductance (L) are previously set with values causing a resonance.
  • V R - i + a - S (4)

Abstract

A driving controlling apparatus for reciprocating compressor using resonance, uses resonance increased in the current corresponding characteristic by compensating the inductance valve of a coil turned inner part of the motor using a capacitor. A electric circuit further comprises a capacitor for compensating the inductance of the coil which is wound around the motor of the reciprocating compressing unit, accordingly, the burden of the applied voltage against the inductance is reduced, so low applied voltage can generate the stroke needed and the variation of the current hardly effect to the variation of the stroke. Therefore, stable load characteristic is maintained because the stroke variation is low even if the load variation is generated.

Description

DRIVING CONTROLLING APPARATUS FOR RECIPROCATING
COMPRESSOR
TECHNICAL FIELD
The present invention relates a driving controlling apparatus of a reciprocating compressor using resonance, and more particularly, to a driving controlling apparatus of a reciprocating compressor using resonance with high current counteracting characteristics by offsetting an inductance value of a coil wound inside a motor by employing a capacitor.
BACKGROUND ART
In general, in a reciprocating compressor, power supplied to a coil wound at a polyphase stator is switched off by using a switching device to thereby generate a rotational torque. In this respect, by sequentially varying an excitation state between a rotor and a stator, a forward rotational torque can be generated by a magnetic suction force.
If a specific excitation state is not varied, the rotor can be stopped at a certain position, and by controlling a phase of an input pulse signal applied to the switching device by taking a maximum inductance as a starting point, a reverse-rotational force can be generated
With such various driving control availability, the reciprocating compressor is adopted for use to electric products requiring a direction control of the motor.
Especially, the reciprocating compressor used for a refrigerator or air-conditioner, a compression ratio can be varied by a voltage applied to the motor, and accordingly, a cooling force can be varied according to a user's intention.
The reciprocating motor will now be described in detail with reference to Figure 1.
Figure 1 is a block diagram showing the construction of a driving controlling apparatus of a general reciprocating compressor.
As shown in Figure 1 , the general reciprocating compressor includes: a reciprocating compressing unit (L.CO P) for varying a stroke by piston's movement to control a cooling force by a voltage applied to an internal motor according to a stroke command value; a voltage detector 30 for detecting a voltage generated at the reciprocating compressing unit (L.COMP) as the stroke is increased by the applied voltage; a current detector 20 for detecting a current applied to the reciprocating compressing unit (L.COMP) as the stroke is increased by the applied voltage; a microcomputer 40 for calculating a stroke with the voltage and the current detected by the voltage detector 30 and the current detector 20, comparing the stroke with the stroke command value and outputting a corresponding switching control signal; and an electric circuit unit 10 for switching off an AC power with a tπ'ac according to the switching control signal of the microcomputer 40 to apply a voltage to the reciprocating compressing unit (L.COMP).
The operation of the conventional reciprocating motor constructed as described will now be explained.
First, in the reciprocating compressing unit (L.COMP), the piston is moved by the voltage applied according to the stroke command value set by a user, and accordingly, a stroke is varied to control a cooling force.
Meanwhile, as the turn-on period of the triac (Tr1) of the electric circuit unit 10 is lengthened by the switching control signal of the microcomputer 40, the stroke of the reciprocating compressing unit (L.COMP) is increased. At this time, the voltage and current applied to the motor (M) of the reciprocating compressing unit (L.COMP) are detected by the voltage detector 30 and the current detector 20 and applied to the microcomputer 40.
Then, the microcomputer 40 calculates a stroke by using the voltage and current detected by the voltage detector 30 and the current detector 20.
The stroke is compared with the stroke command value to output a corresponding switching control signal.
That is, if the calculated stroke is smaller than the stroke command value, the microcomputer 40 outputs a switching control signal for lengthening the ON period of the triac (Tr1) in order to increase the voltage applied to the reciprocating compressing unit (L.COMP).
If, however, the calculated stroke is greater than the stroke command value, the microcomputer 40 outputs a switching control signal for shortening
the ON period of the triac (Tr1) to reduce the voltage applied to the reciprocating compressing unit (L.COMP).
The relation between the voltage applied to the motor (M) and the stroke can be expressed by the following equation (1)
V = L — + R 'i + a - S (1 ) dt wherein α indicates a motor constant for converting an electric force to a
mechanic force, S indicates a stroke, 'R' is a internal resistance of the motor, and 'L' indicates an inductance of the motor (M) itself.
The inductance voltage (L — ) is almost similar to a back electromotive dt
force ( - S) , and the voltage by the internal resistance (R) can be negligible
compared with the back electromotive force ( - S) .
Accordingly, the voltage (V) applied to the motor (M) is determined by
sum of the inductance voltage (L — ) and the back electromotive force dt
(a - S) , and in order to generate a required stroke, the voltage (V) applied to
the motor should be increased.
At this time, in order to improve an efficiency of the reciprocating compressor, the inductance (L) value of the coil wound on the motor (M) itself should be small, and the inductance (L) value of the coil becomes small as the size of the motor (magnet) is increased. Thus, in order to improve the efficiency of the reciprocating motor, if the size of the mover (the thickness of the magnet) is increased, an air gap is increased, causing a problem that the overall size and cost of the reciprocating compressor is increased.
Meanwhile, if the size of the mover (the thickness of the magnet) is reduced, the inductance (L) value of the coil wound at the motor (M) is increased. Then, the current according to the voltage value for the stroke control of the reciprocating compressor would slowly work, so that the stroke is not smoothly controlled.
TECHNICAL GIST OF THE PESENT INVENTION
Therefore, an object of the present invention is to provide a driving controlling apparatus of a reciprocating compressor which has an excellent current counteracting capacity by offsetting a quality which slows current operation characteristics as an inductance value of a coil wound inside a motor is increased by employing a capacitor.
DETAILED DESCRIPTION OF THE INVENTION
In order to achieve the above objects, there is provided a driving controlling apparatus of a reciprocating compressor having a reciprocating compressing unit controlling a cooling force by varying a stroke according to a piston's movement by a voltage applied to an internal motor according to a stroke command value and an electric circuit unit for switching an AC power with a triac and applying it to the motor of the reciprocating compressing unit, wherein the electric circuit unit includes a capacitor for offsetting an inductance of a coil wound at a motor itself of the reciprocating compressing unit.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a block diagram showing the construction of a driving controlling apparatus of a conventional reciprocating compressor; and
Figure 2 is a block diagram showing the construction of a driving controlling apparatus of a reciprocating compressor using a resonance according to the present invnetion.
MODE FOR CARRYING OUT THE PREFERRED EMBODIMENTS The operation and effect of a driving controlling apparatus of a reciprocating compressor will now be described in detail with reference to the accompanying drawings.
Figure 2 is a block diagram showing the construction of a driving controlling apparatus of a reciprocating compressor using a resonance according to the present invnetion.
As shown in Figure 2, a driving controlling apparatus of a reciprocating compressor includes: a reciprocating compressing unit (L.COMP) for varying a stroke by piston's movement to control a cooling force by a voltage applied to an internal motor according to a stroke command value; a voltage detector 30 for detecting a voltage generated at the reciprocating compressing unit (L.COMP) as the stroke is increased by the applied voltage; a current detector 20 for detecting a current applied to the reciprocating compressing unit (L.COMP) as the stroke is increased by the applied voltage; a microcomputer
40 for calculating a stroke with the voltage and the current detected by the voltage detector 30 and the current detector 20, comparing the stroke with the stroke command value and outputting a corresponding switching control signal; and an electric circuit unit 10 having a capacitor (C) to offset an inductance of a coil (L) wound at the motor (M) itself of the reciprocating compressing unit (L.COMP) and switching off an AC power with a triac according to the switching control signal of the microcomputer 40 to apply a voltage to the reciprocating compressing unit (L.COMP).
The operation of the driving controlling apparatus of a reciprocating compressor will now be described in detail. First, the piston is moved by an applied voltage according to a stroke command value set by a user, and accordingly, a stroke is varied to control a cooling force.
Meanwhile, as the turn-on period of the triac (Tr1) of the electric circuit unit 10 is lengthened by the switching control signal of the microcomputer 40, the stroke of the reciprocating compressing unit (L.COMP) is increased. At this time, the voltage and current applied to the motor (M) of the reciprocating compressing unit (L.COMP) are detected by the voltage detector 30 and the current detector 20 and applied to the microcomputer 40.
Then, the microcomputer 40 calculates a stroke by using the voltage
and current detected by the voltage detector 30 and the current detector 20.
The stroke is compared with the stroke command value to output a corresponding switching control signal.
In this respect, in the present invention, the capacitor (C) is connected in series to the motor (M) to offset an inductance (L) of a coil wound at the motor (M), which will now be described in detail.
First, a voltage (V) applied to both ends of the motor (M) and the capacitor (C) can be deduced to the following equation (2):
At this time, a capacitance can be set by the following equation (3):
C = _ (3)
(2πf)2 L
At this time, the capacitance (C) and the inductance (L) are previously set with values causing a resonance.
Accordingly, since the capacitance (C) and the inductance (L) are mutually resonated and offset, so that the voltage (V) applied to both ends of the motor (M) and the capacitor is deduced to the following equation (4):
V = R - i + a - S (4)
In equation (4), the applied voltage (V) has the similar size to the back
electromotive force (a ■ S) as the inductance voltage (L — ) is offset by the dt
capacitor voltage (— , and accordingly, a required stroke is generated
at the low applied voltage (V).
In addition, since the voltage filled in the capacitor (C) is applied to the motor (M) like the applied voltage (V), a big stroke is generated with the small applied voltage. Thus, an overload counteracting capacity is improved.
INDUSTRIAL APPLICABILITY
As so far described, according to the driving controlling apparatus of a reciprocating compressor, since the current operation characteristics according to the increase in the inductance of the coil inside the motor is offset by employing the capacitor, the load of the applied voltage to inductance is reduced, and thus, a required stroke can be generated with the low applied voltage.
In addition, since the current change makes a little influence on the stroke variation, even though a load change occurs, the stroke variation is small, so that stable load characteristics are obtained.

Claims

1. A driving controlling apparatus of a reciprocating compressor having a reciprocating compressing unit controlling a cooling force by varying a stroke according to a piston's movement by a voltage applied to an internal motor according to a stroke command value and an electric circuit unit for switching an AC power with a triac and applying it to the motor of the reciprocating
compressing unit, wherein the electric circuit unit includes a capacitor for offsetting an inductance of a coil wound at a motor itself of the reciprocating compressing unit.
2. The apparatus of claim 1 , wherein the capacitor is positioned between the motor and a power supply unit.
3. The apparatus of claim 1, wherein the capacitor is positioned between the motor an the triac.
EP01934583A 2001-03-26 2001-05-24 Driving controlling apparatus for reciprocating compressor Expired - Lifetime EP1373728B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR10-2001-0015634A KR100396774B1 (en) 2001-03-26 2001-03-26 Driving comtrol apparatus for reciprocating compressor
KR2001015634 2001-03-26
PCT/KR2001/000867 WO2002077453A1 (en) 2001-03-26 2001-05-24 Driving controlling apparatus for reciprocating compressor

Publications (3)

Publication Number Publication Date
EP1373728A1 true EP1373728A1 (en) 2004-01-02
EP1373728A4 EP1373728A4 (en) 2004-06-23
EP1373728B1 EP1373728B1 (en) 2005-01-12

Family

ID=19707404

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01934583A Expired - Lifetime EP1373728B1 (en) 2001-03-26 2001-05-24 Driving controlling apparatus for reciprocating compressor

Country Status (9)

Country Link
US (1) US20030143080A1 (en)
EP (1) EP1373728B1 (en)
JP (1) JP3917526B2 (en)
KR (1) KR100396774B1 (en)
CN (1) CN1430702A (en)
AT (1) ATE287043T1 (en)
BR (1) BR0111190A (en)
DE (1) DE60108427T2 (en)
WO (1) WO2002077453A1 (en)

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WO2004046550A1 (en) * 2002-11-19 2004-06-03 Empresa Brasileira De Compressores S.A.-Embraco A control system for the movement of a piston
KR100764795B1 (en) * 2002-12-20 2007-10-11 엘지전자 주식회사 Driving device and method of reciprocating compressor
KR100524726B1 (en) * 2003-08-14 2005-10-31 엘지전자 주식회사 Driving circuit of reciprocating compressor
KR100595550B1 (en) * 2004-02-20 2006-07-03 엘지전자 주식회사 Compressor driving apparatus of refrigerator with reciprocating compressor
KR100608671B1 (en) 2004-06-03 2006-08-08 엘지전자 주식회사 Driving control apparatus and method for line start type reciprocating compressor
KR100608690B1 (en) * 2004-09-11 2006-08-09 엘지전자 주식회사 Driving control apparatus and method for reciprocating compressor
EP1635060B1 (en) * 2004-09-11 2012-09-19 LG Electronics, Inc. Apparatus and method for controlling a compressor
KR100677530B1 (en) * 2004-11-26 2007-02-02 엘지전자 주식회사 Driving control apparatus and method for reciprocating compressor
US8156751B2 (en) * 2005-05-24 2012-04-17 Emerson Climate Technologies, Inc. Control and protection system for a variable capacity compressor
KR100652607B1 (en) * 2005-10-24 2006-12-01 엘지전자 주식회사 Apparatus for controlling operation of reciprocating compressor and method thereof
KR100774470B1 (en) * 2006-01-16 2007-11-08 엘지전자 주식회사 Driving control apparatus and method for reciprocating compressor
KR100756719B1 (en) * 2006-02-02 2007-09-07 엘지전자 주식회사 Control apparatus for linear compressor
KR100756720B1 (en) * 2006-02-02 2007-09-07 엘지전자 주식회사 Control apparatus for linear compressor
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Also Published As

Publication number Publication date
EP1373728B1 (en) 2005-01-12
JP3917526B2 (en) 2007-05-23
KR100396774B1 (en) 2003-09-03
US20030143080A1 (en) 2003-07-31
ATE287043T1 (en) 2005-01-15
JP2004519579A (en) 2004-07-02
KR20020075565A (en) 2002-10-05
WO2002077453A1 (en) 2002-10-03
DE60108427D1 (en) 2005-02-17
DE60108427T2 (en) 2006-01-05
BR0111190A (en) 2003-04-08
CN1430702A (en) 2003-07-16
EP1373728A4 (en) 2004-06-23

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