CN100441869C - Apparatus and method for controlling operation of compressor - Google Patents
Apparatus and method for controlling operation of compressor Download PDFInfo
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- CN100441869C CN100441869C CNB2005100550394A CN200510055039A CN100441869C CN 100441869 C CN100441869 C CN 100441869C CN B2005100550394 A CNB2005100550394 A CN B2005100550394A CN 200510055039 A CN200510055039 A CN 200510055039A CN 100441869 C CN100441869 C CN 100441869C
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- 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
- F04B49/06—Control using electricity
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- 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
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- 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
- F04B49/12—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 by varying the length of stroke of the working members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/08—Compressors specially adapted for separate outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
- F25B31/02—Compressor arrangements of motor-compressor units
- F25B31/023—Compressor arrangements of motor-compressor units with compressor of reciprocating-piston type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/025—Motor control arrangements
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- 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
- F04B2203/00—Motor parameters
- F04B2203/04—Motor parameters of linear electric motors
- F04B2203/0401—Current
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- 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
- F04B2203/00—Motor parameters
- F04B2203/04—Motor parameters of linear electric motors
- F04B2203/0402—Voltage
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- 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
- F04B2203/00—Motor parameters
- F04B2203/04—Motor parameters of linear electric motors
- F04B2203/0404—Frequency of the electric current
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- 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
- F04B2207/00—External parameters
- F04B2207/04—Settings
- F04B2207/046—Settings of length of piston stroke
Abstract
An apparatus for controlling a compressor includes a stroke calculator for calculating a stroke estimate value of a compressor based on a value of a current applied to a motor of the compressor and a value of a voltage applied to the motor of the compressor; an operation frequency reference determining unit for integrating the stroke estimate value to output an integrated stroke value, detecting a mechanical resonance frequency of the compressor based on the integrated stroke estimate value and the current value, and determining the detected mechanical resonance frequency as an operation frequency reference value; and a controller for varying a current operation frequency of the compressor according to the determined operation frequency reference value.
Description
Technical field
The present invention relates to compressor, specifically, relate to a kind of Apparatus and method for of controlling operation of reciprocating compressor.
Background technique
In general, reciprocal compressor does not adopt crankshaft to convert rotation to linear motion, so its compression efficiency is higher than general compressor.
When reciprocal compressor was used for refrigerator or air-conditioning, the compressibility of reciprocal compressor can change according to the variation of the stroke voltage of importing reciprocal compressor controlled refrigerating capacity.
With reference to Fig. 1 a kind of traditional reciprocal compressor is described below.
Fig. 1 is a block diagram, shows a kind of apparatus structure that is used to control operation of reciprocating compressor according to prior art.
As shown in Figure 1, the conventional apparatus that is used to control operation of reciprocating compressor comprises: the current detector 4 that is used to detect the electric current on the motor (not shown) that is applied to reciprocal compressor 6; Be used to detect the voltage detector 3 that is applied to the voltage on the motor; Stroke calculator 5, it is used for calculating the valuation of compressor stroke based on detected electric current and magnitude of voltage and a parameter of electric machine; Comparator 1, the stroke valuation that it is used for relatively calculating with preset stroke reference value, according to comparative result output difference; With Fill argon clamping fixture 2, it is used for by change the operation (stroke) with control compressor 6 of the voltage that is applied on the motor according to difference.
Be used to control the following operation of device of the operation of reciprocal compressor:
At first, current detector 4 detects current value that electric current on the motor that is applied to compressor 6 and output detected to stroke calculator 5.Simultaneously, voltage detector 3 detects magnitude of voltage that the voltage that is applied on the motor and output detected to stroke calculator 5.
Stroke calculator 5 electric current and magnitude of voltage and formula (1) that parameter of electric machine substitution is as follows by being detected, the stroke valuation (X) of calculating compressor, and the stroke valuation (X) of gained is applied to comparator 1.
Wherein ' R ' is the motor resistance value, and ' L ' is the inductance value of motor, and α is the motor constant, V
MBe the magnitude of voltage that is applied to motor, ' i ' is the current value that is applied to motor, and ' i ' is the time rate of change that is applied to the electric current of motor.That is, ' i ' is the differential value (di/dt) of ' i '.
Comparator 1 is stroke valuation and stroke reference value relatively, and according to comparative result difference is applied to Fill argon clamping fixture 2.
Fill argon clamping fixture 2 is controlled the stroke of compressor 6 by change voltage on the motor be applied to compressor 6 based on difference.This illustrates with reference to Fig. 2.
Fig. 2 is a method flow diagram according to the control operation of reciprocating compressor of prior art.
At first, when stroke calculator 5 was applied to comparator 1 (step S1) with the stroke valuation, comparator 1 compared the stroke valuation and presets stroke reference value (step S2) and export difference to Fill argon clamping fixture 2 according to comparative result.
If the stroke valuation is less than stroke reference value, Fill argon clamping fixture 2 increases the voltage that is applied on the motor stroke (step S3) with the control compressor.Yet, if the stroke valuation greater than stroke reference value, Fill argon clamping fixture 2 reduces to be applied to the voltage (step S4) on the motor.
Therefore, in the apparatus and method of the operation of traditional control reciprocal compressor, although the mechanical resonance frequency of compressor changes based on stroke valuation and stroke reference value because of the voltage that is applied on the compressor electric motor, but reciprocal compressor is always with the identical operations frequencies operations, this causes a problem, the i.e. decrease in efficiency of reciprocal compressor.
The reciprocal compressor of different embodiment according to the subject invention is at the U.S. patent No.6 of on November 11st, 2003 registration, announces in 644,943.
Summary of the invention
Therefore, an object of the present invention is to provide a kind of equipment and method that is used to control compressor operation, even the load variations of compressor also can improve the efficient of compressor.
For realizing these and other advantage and according to purpose of the present invention, as exemplifying and broad description at this, a kind of equipment that is used for compressor control also is provided, and it comprises: be used for calculating the stroke calculator of the stroke valuation of compressor based on current value that is applied to compressor electric motor and the magnitude of voltage that is applied to compressor electric motor; Operating frequency reference value determining unit is used for the valuation of integration stroke and exports the integration stroke value, based on the stroke valuation of integration and the mechanical resonance frequency of current value detection compressor, and determines that the mechanical resonance frequency that is detected is the operating frequency reference value; And controller, be used for the current operating frequency that the definite operating frequency reference value of basis changes compressor.
For realizing above purpose, a kind of equipment that is used to control compressor operation also is provided, it comprises: the current detector that is used to detect the electric current that is applied to compressor electric motor; Be used to detect the voltage detector of the voltage that is applied to compressor electric motor; Be used for stroke calculator based on the stroke valuation of detected electric current and voltage and parameter of electric machine calculating compressor; Operating frequency reference value determining unit is used for the valuation of integration stroke and exports the integration stroke value, based on the stroke valuation of integration with detect the mechanical resonance frequency that current value detects compressor, and determines that the mechanical resonance frequency that is detected is the operating frequency reference value; Comparator is used for stroke valuation and the stroke reference value of comparison from the output of stroke calculator, and according to comparative result output difference; And controller, be used for changing current operating frequency and changing voltage on the motor that is applied to compressor according to difference from comparator output according to the operating frequency reference value of determining.
For realizing above purpose, a kind of method that is used to control compressor operation also is provided, it comprises: based on current value that is applied to compressor electric motor and the voltage that is applied to motor, the stroke valuation of integration compressor is also exported the integration stroke value; Mechanical resonance frequency based on integration stroke value and current value detection compressor; Determine that mechanical resonance frequency is the operating frequency reference value of compressor; With the current operating frequency that changes compressor according to the operating frequency reference value of determining.
For realizing above purpose, a kind of equipment that is used to control compressor operation also is provided, it comprises: be used for calculating the stroke calculator of the stroke valuation of compressor based on current value that is applied to compressor electric motor and the magnitude of voltage that is applied to compressor electric motor; Operating frequency reference value determining unit is used for the integration current value and exports the integration current value, detects the mechanical resonance frequency of compressor based on the current value of stroke valuation and integration, and determines that the mechanical resonance frequency that is detected is the operating frequency reference value; And controller, be used for the current operating frequency that the definite operating frequency reference value of basis changes compressor.
For realizing above purpose, a kind of equipment that is used to control compressor operation also is provided, it comprises: the current detector that is used to detect the electric current that is applied to compressor electric motor; Be used to detect the voltage detector of the voltage that is applied to compressor electric motor; Be used for stroke calculator based on the stroke valuation of detected electric current and voltage and parameter of electric machine calculating compressor; Operating frequency reference value determining unit is used for the integration current value and exports the integration current value, detects the mechanical resonance frequency of compressor and determines that the mechanical resonance frequency that is detected is the operating frequency reference value based on the current value of stroke valuation and integration; Comparator is used for stroke valuation and the stroke reference value of comparison from the output of stroke calculator, and according to comparative result output difference; And controller, be used for changing current operating frequency and changing voltage on the motor that is applied to compressor according to difference from comparator output according to the operating frequency reference value of determining.
For realizing above purpose, a kind of method that is used to control compressor operation also is provided, it comprises: based on current value that is applied to compressor electric motor and the voltage that is applied to motor, the stroke valuation of calculating compressor; Integration current value and output integration current value; Mechanical resonance frequency based on stroke valuation and integration current value detection compressor; Determine that mechanical resonance frequency is the operating frequency reference value of compressor; With the current operating frequency that changes compressor according to the operating frequency reference value of determining.
Hereinafter describe in detail in conjunction with the of the present invention of accompanying drawing of the present invention, above-mentioned and other purpose, feature, aspect and advantage of the present invention will become more obvious.
Description of drawings
Accompanying drawing provides further to be understood a part of the present invention, incorporates and form the application's a part into.Embodiment shown in the present invention with specification in order to illustrate principle of the present invention.
Among the figure:
Fig. 1 is a block diagram, shows the structure of equipment that is used to control operation of reciprocating compressor according to prior art;
Fig. 2 is a flow chart of method that is used to control operation of reciprocating compressor according to prior art;
Fig. 3 is a block diagram, shows the structure of equipment that is used to control compressor operation according to first embodiment of the invention;
The plotted curve of Fig. 4 A and 4B shows according to the current phase that is applied to compressor electric motor of first embodiment of the invention and the stroke phase place of compressor;
Fig. 5 is a flow chart, shows the method that is used to control compressor operation according to first embodiment of the invention;
Fig. 6 is a block diagram, shows the equipment that is used to control compressor operation according to second embodiment of the invention;
Fig. 7 is a plotted curve, shows according to the current phase that is applied to compressor electric motor of second embodiment of the invention and the stroke phase place of compressor; With
Fig. 8 is a flow chart, shows the method that is used to control compressor operation according to second embodiment of the invention.
Embodiment
According to a preferred embodiment of the invention, with reference to a kind of equipment and method that is used to control compressor operation of Fig. 3 to 8 explanation,, also can improve the operating efficiency of compressor although the load of compressor changes.
Fig. 3 is a block diagram, shows the structure of equipment that is used to control compressor operation according to first embodiment of the invention.
As shown in Figure 3, the equipment that is used to control compressor operation comprises: the current detector 40 that is used to detect the electric current that is applied to compressor 60 motors; Be used to detect the voltage detector 30 of the voltage that is applied to compressor 60 motors; Be used for stroke calculator 50 based on the stroke valuation of detected electric current and voltage and parameter of electric machine calculating compressor 60; Operating frequency reference value determining unit 70 is used for the valuation of integration stroke, based on the stroke valuation of integration with detect the mechanical resonance frequency that current value detects compressor, and the mechanical resonance frequency that is detected is defined as the operating frequency reference value; Comparator 10 is used for relatively from the stroke valuation and the stroke reference value of 50 outputs of stroke calculator, and according to comparative result output difference; With controller 20, it changes current operating frequency and changes the voltage that is applied on compressor 60 motors according to the difference from comparator 10 outputs according to the operating frequency reference value of determining, thus the operation of control compressor 60.
The operation that is used to control the equipment of compressor operation according to the preferred embodiment of the invention will be described in detail as follows.
At first, current detector 40 detects and is applied to the electric current on the compressor 60 and exports detected current value to stroke calculator 50 and operating frequency reference value determining unit 70.At this moment, voltage detector 30 detects and is applied to the voltage on the compressor 60 and exports detected magnitude of voltage to stroke calculator 50.
The stroke valuation that comparator 10 compares stroke reference value and exports from stroke calculator 50 is arrived controller 20 according to comparative result output difference then.
The 70 integration stroke valuations of operating frequency reference value determining unit detect the mechanical resonance frequency of compressor based on the stroke valuation of integration with by the current value that current detector 40 detects, and the mechanical resonance frequency that is detected are defined as the operating frequency reference value.
For example, when motor was in resonance state, operating frequency reference value determining unit 70 multiply by the current value that is detected with the integration stroke value in one-period, and when product and when being 0, measured operating frequency is defined as the operating frequency reference value.In other words, when the integration stroke value multiply by the current value gained that detects value and when being 0, the operating frequency that operating frequency reference value determining unit 70 will detect this moment is identified as mechanical resonance frequency and determines that this mechanical resonance frequency is the operating frequency reference value.Here, when operating frequency and mechanical resonance frequency were consistent situation, the operating efficiency of compressor was improved.
The mechanical resonance frequency value is calculated by formula as follows (2):
∑(∫Xdt×i)-------------------------(2)
That is, will to calculate the value get by formula (2) be that 0 o'clock measured operating frequency is identified as mechanical resonance frequency and definite this mechanical resonance frequency is the operating frequency reference value to operating frequency reference value determining unit 70.Here, ' X ' is the stroke valuation, and ' i ' is the current value that is applied to motor.
Therefore, controller 20 is controlled the operation of compressor 60 by change the current operating frequency of compressor 60 according to the operating frequency reference value from 70 outputs of operating frequency reference value determining unit.In other words, if this operating frequency reference value greater than current operation frequency value, then controller 20 increases current operating frequency.If this operating frequency reference value is less than current operation frequency value, controller 20 reduces current operating frequency.
The stroke phase place of compressor and current phase are with reference to Fig. 4 A and 4B explanation.
The plotted curve of Fig. 4 A and 4B, show according to first embodiment of the invention and be applied to the current phase of compressor electric motor and the stroke phase place of compressor, position of piston when wherein stroke is represented piston reciprocates when compressor, stroke phase place are represented when piston reciprocates the waveform (sine wave) according to position of piston.
Shown in Fig. 4 A, stroke phase place and current phase differ 90 °, and in this respect, experiment shows, when stroke phase place and current phase differ 90 °, even the load variations of compressor also resonance phenomenon can take place.
Fig. 4 B shows the phase place that stroke phase place and the current phase by integrogram 4A obtains.
Shown in Fig. 4 B, experiment shows, even compressor has load, if the summation that the integration stroke value be multiply by the value of the current value gained that is applied to motor is 0, resonance phenomenon takes place then.In other words, when motor was in resonance state, integration stroke value and current value multiplied each other in one-period, and with the value addition of being taken advantage of, additive value becomes 0 then.Therefore, to multiply by the operating frequency that is detected when being 0 of value of integration stroke value gained identical with mechanical resonance frequency when current value.
Following operation with reference to Fig. 5 description operation frequency reference value determining unit 70: in one-period, the integration stroke value be multiply by current value, the product that adds up, when summation is 0 the detecting operation frequency, and determine that measured operation frequency value is the operating frequency reference value.
Fig. 5 is a flow chart, shows the method that is used to control compressor operation according to first embodiment of the invention.
As shown in Figure 5, the method that is used to control compressor operation according to first embodiment of the invention comprises: detect the electric current and the magnitude of voltage that are applied to compressor 60; Stroke valuation based on electric current and magnitude of voltage calculating compressor; Valuation of integration stroke and the stroke valuation of exporting integration; The numerical value summation that multiply by the current value gained based on integration stroke valuation in one-period detects the mechanical resonance frequency of compressor and this mechanical resonance frequency is defined as the operating frequency reference value; The operating frequency reference value of determining with basis changes the current operating frequency of compressor.
Here, when integration stroke valuation in one-period and current value multiply each other the summation of value of gained when being 0 the mechanical resonance frequency of detected operating frequency and compressor the same.Therefore, under the situation of the current operating frequency of the operating frequency change compressor that when the summation of value according to the gained that multiplies each other when valuation of integration stroke and current value in one-period is 0, is detected, because the operating frequency after changing is identical with mechanical resonance frequency, so the efficient of compressor is improved.
At first, operating frequency reference value determining unit 70 multiply by current value with the integration stroke valuation in one-period, the product (step S11) that adds up, compare then the summation calculated and the last week interim integration stroke value and the multiply each other summation (step S12) of numerical value of gained of current value.
If the summation that the integration stroke value in one-period multiply by current value institute value greater than in the last week the valuation of interim integration stroke multiply by the summation of current value institute value, and the current operating frequency of compressor 60 is greater than before this operating frequency (step S13), then operating frequency reference value determining unit 70 reduces current operating frequency continuously, then, the summation of the value that will be obtained by valuation of integration stroke and current value are multiplied each other in one-period becomes the operating frequency (consistent with mechanical resonance frequency) that detected at 0 o'clock and is defined as operating frequency reference value (step S15).
If the summation of current value institute value multiply by current value institute value greater than interim integration stroke valuation the last week summation is multiply by in the valuation of integration stroke, if and current operating frequency is less than operating frequency (step S13) before this, then operating frequency reference value determining unit 70 increases continuously current operating frequency, then, will be in a current period be that the operating frequency that detected in 0 o'clock is defined as operating frequency reference value (step S16) with the multiply each other summation of value of gained of the valuation of integration stroke and current value.
If the summation of current value institute value multiply by current value institute value less than interim integration stroke valuation the last week summation is multiply by in the valuation of integration stroke, if and current operating frequency is less than operating frequency (step S14) before this, then operating frequency reference value determining unit 70 reduces current operating frequency continuously, then, will be in a current period be that the operating frequency that detected in 0 o'clock is defined as operating frequency reference value (step S17) with the multiply each other summation of value of gained of the valuation of integration stroke and current value.
Simultaneously, if the summation of current value institute value multiply by current value institute value less than interim integration stroke valuation the last week summation is multiply by in the valuation of integration stroke, if and current operating frequency is greater than operating frequency (step S14) before this, then operating frequency reference value determining unit 70 increases continuously current operating frequency, then, will be in a current period be operating frequency reference value (step S18) with the valuation of integration stroke and the current value operating frequency that the summation of value of gained is defined as detecting in 0 o'clock that multiplies each other.
Therefore, the summation of the value that is obtained owing in one-period valuation of integration stroke and current value multiplied each other is that the mechanical resonance frequency of 0 o'clock measured operating frequency and compressor is the same, so the summation of the value that can be obtained according in one-period the valuation of integration stroke and current value being multiplied each other is that 0 o'clock measured operating frequency changes current operating frequency, thereby operating efficiency of raising compressor.
In other words, when operation of reciprocating compressor, load variations whenever compressor, the mechanical resonance frequency that detects compressor based on the integration stroke valuation in one-period and current value then, then, change the operating frequency of compressor according to measured mechanical resonance frequency, thereby improve the operating efficiency of compressor.
On the other hand, in the present invention, after the electric current that is applied to motor was integrated, the mechanical resonance frequency of compressor can be based on integration current value and stroke valuation and is recorded.
Therefore, below with reference to Fig. 6 to 8 explanation second embodiment of the present invention, in a second embodiment can be by measure the mechanical resonance frequency of compressor based on integration current value and stroke valuation, and change the operating frequency of compressor, thereby improve the operating efficiency of compressor according to measured mechanical resonance efficient.
Except that operating frequency reference value determining unit 100, the structure of equipment that being used to according to a second embodiment of the present invention controlled compressor operation is the same with first embodiment, and therefore, identical reference character is represented similar elements.
Fig. 6 is a block diagram, shows the equipment that is used to control compressor operation according to second embodiment of the invention.
As shown in Figure 6, the equipment that is used to control operation of reciprocating compressor according to second embodiment of the invention comprises: the current detector 40 that is used to detect the electric current of the motor that is applied to compressor 60; Be used to detect the voltage detector 30 of the voltage that is applied to compressor 60 motors; Be used for stroke calculator 50 based on the stroke valuation of detected electric current and voltage and parameter of electric machine calculating compressor 60; Operating frequency reference value determining unit 100 is used for the current value of integrated detected, detects the mechanical resonance frequency of compressor based on the stroke valuation of the current value of integration and calculating, and the mechanical resonance frequency that is detected is defined as the operating frequency reference value; Comparator 10 is used for relatively from the stroke valuation and the stroke reference value of 50 outputs of stroke calculator, and according to comparative result output difference; With controller 20, it changes current operating frequency and changes voltage on the motor that is applied to compressor 60 according to the difference from comparator 10 outputs according to the operating frequency reference value of determining, thus the operation of control compressor 60.
The operation that is used to control the equipment of compressor operation according to a second, preferred embodiment of the present invention will be described in detail as follows.
At first, current detector 10 detects and is applied to the electric current on the compressor 60 and exports detected current value to stroke calculator 50 and operating frequency reference value determining unit 100.At this moment, voltage detector 30 detects and is applied to the voltage on the compressor 60 and exports detected magnitude of voltage to stroke calculator 50.
The current value that operating frequency reference value determining unit 100 integrations are detected detects mechanical resonance frequency based on the current value and the stroke valuation of integration, and determines that the mechanical resonance frequency that is detected is the operating frequency reference value.
For example, when motor was in resonance state, the integration current that operating frequency reference value determining unit 100 will be in one-period was on duty with the stroke valuation, and when the summation of product is maximum value, measured operating frequency is defined as the operating frequency reference value.In other words, when the summation with the integration current value with stroke valuation gained on duty was maximum value, the operating frequency that operating frequency reference value determining unit 100 will detect this moment was identified as mechanical resonance frequency and determines that this mechanical resonance frequency is the operating frequency reference value.Here, when operating frequency and mechanical resonance frequency were consistent situation, the operating efficiency of compressor was improved.
The mechanical resonance frequency value is calculated by formula as follows (3):
∑(X×∫idt)-------------------------(3)
That is measured operating frequency was identified as mechanical resonance frequency and determines that this mechanical resonance frequency is the operating frequency reference value when, operating frequency reference value determining unit 100 will be maximum value by the value that formula (3) calculating gets.Here, ' X ' is the stroke valuation, and ' i ' is the current value that is applied to motor.
Therefore, controller 20 is controlled the operation of compressor 60 by the current operating frequency that changes compressor 60 according to the operating frequency reference value from 100 outputs of operating frequency reference value determining unit.In other words, if the operating frequency reference value greater than current operation frequency value, controller 20 increases current operating frequency.If the operating frequency reference value is less than current operation frequency value, controller 20 reduces current operating frequency.
The stroke phase place and the current phase of compressor illustrate with reference to Fig. 7.
Fig. 7 is a plotted curve, shows according to the current phase that is applied to compressor electric motor of second embodiment of the invention and the stroke phase place of compressor.Be that Fig. 7 shows phase place and the stroke phase place that the current phase by integrogram 4A obtains.
As shown in Figure 7, even experiment shows to have compressor that load is arranged, when becoming maximum value by the summation that the stroke valuation be multiply by the value that the integration current value obtained, resonance phenomenon takes place.That is, when motor was in resonance state, in one-period, integration current value and stroke valuation were multiplied each other, and product value adds up then, and accumulated value becomes maximum value.Therefore, when the summation with the integration current value that is obtained with the stroke valuation on duty became maximum value, measured operating frequency was identical with mechanical resonance frequency.
Following operation with reference to Fig. 8 description operation frequency reference value determining unit 100: in one-period with integration current on duty with the stroke valuation, add up multiply each other institute's value, when summation is maximum value the detecting operation frequency, and determine that measured operation frequency value is the operating frequency reference value.
Fig. 8 is the flow chart of method that is used to control compressor operation according to second embodiment of the invention.
As shown in Figure 8, the method that is used to control compressor operation according to a second embodiment of the present invention comprises: detect the electric current and the magnitude of voltage that are applied to compressor 60; Stroke valuation based on electric current and magnitude of voltage calculating compressor; The integration current value is also exported the current value of an integration; Based on the sue for peace mechanical resonance frequency that detects compressor and determine that this mechanical resonance frequency is the operating frequency reference value of the numerical value that in one-period, the stroke valuation be multiply by integration current value gained; The operating frequency reference value that should determine with basis change the current operating frequency of compressor.
Here, when the summation of the value of the gained that in one-period, stroke valuation and integration current value the multiplied each other mechanical resonance frequency of detected operating frequency and compressor when maximum the same.Therefore, when the operating frequency that is detected during for maximum according to the summation of the value that is obtained when in one-period stroke valuation and integration current value being multiplied each other when the current operating frequency of compressor changes, because the operating frequency after changing is identical with mechanical frequency, so the operating efficiency of compressor is improved.
At first, operating frequency reference value determining unit 100 multiply by the integration current value with the stroke valuation in one-period, the product (step S21) that adds up compares the multiply each other summation (step S22) of numerical value of gained of the summation calculated and interim stroke valuation the last week and integration current value then.
If the summation that integration current value institute value is multiply by in the stroke valuation in one-period greater than in the last week interim stroke valuation multiply by the summation of integration current value institute value, and the current operating frequency of compressor 60 is greater than before this operating frequency (step S23), then operating frequency reference value determining unit 100 increases current operating frequency continuously, then, stroke valuation in one-period and the integration current value operating frequency (consistent with mechanical resonance frequency) that detects when the summation of value of gained becomes maximum that multiplies each other is defined as operating frequency reference value (step S25).
If the summation that integration current value institute value is multiply by in the stroke valuation in one-period multiply by the summation of integration current value institute value greater than interim stroke valuation the last week, and the current operating frequency of compressor 60 is less than operating frequency (step S23) before this, then operating frequency reference value determining unit 100 reduces current operating frequency continuously, the operating frequency that detects when then, the summation of the value that is obtained by stroke valuation and integration current value are multiplied each other being become maximum in a current period is defined as operating frequency reference value (step S26).
If the summation that integration current value institute value is multiply by in the stroke valuation in one-period multiply by the summation of integration current value institute value less than interim stroke valuation the last week, and the current operating frequency of compressor 60 is less than operating frequency (step S24) before this, then operating frequency reference value determining unit 100 increases continuously current operating frequency, the operating frequency that detects when then, the summation of the value that is obtained by stroke valuation and integration current value are multiplied each other being become maximum in a current period is defined as operating frequency reference value (step S27).
If the summation that integration current value institute value is multiply by in the stroke valuation in one-period multiply by the summation of integration current value institute value less than interim stroke valuation the last week, and the current operating frequency of compressor 60 is greater than operating frequency (step S24) before this, then operating frequency reference value determining unit 100 reduces current operating frequency continuously, the operating frequency that detects when then, the summation of the value that is obtained by stroke valuation and integration current value are multiplied each other being become maximum in a current period is defined as operating frequency reference value (step S28).
Therefore, since in one-period stroke valuation and integration current value multiply each other the summation of value of gained when becoming maximum the mechanical resonance frequency of measured operating frequency and compressor the same, so measured operating frequency changes current operating frequency in the time of can becoming maximum according to the summation of the value by gained that stroke valuation and integration current value are multiplied each other in one-period, thereby operating efficiency of enhancing compressor.
In other words, when operation of reciprocating compressor, load variations whenever compressor, then detect the mechanical resonance frequency of compressor based on valuation of integration stroke and current value in one-period, then, change the operating frequency of compressor according to measured mechanical resonance frequency, thereby improve the operating efficiency of compressor.
So far described equipment and the method that is used to control operation of reciprocating compressor according to the present invention has following advantage.
That is, for example, whenever the load variations of compressor, measure the mechanical resonance frequency of compressor, and change the operating frequency of compressor according to measured mechanical resonance frequency based on integration stroke value in one-period and current value.Therefore, even when the load variations of compressor, the operating efficiency of compressor can be improved.
In addition, when the load variations of compressor, measure the mechanical resonance frequency of compressor, and change the operating frequency of compressor according to measured mechanical resonance frequency based on integration stroke value in one-period and current value.Therefore, even when the load variations of compressor, the operating efficiency of compressor can be improved.
, the present invention do not break away from its thought or scope because can exemplifying in a variety of forms, be to be understood that except as otherwise noted, more than explanation embodiment is not limited to any details of above stated specification, but answer the spirit and scope of broad interpretation in claims, therefore all are included in the bounds of claim, or are equal to the change of this bounds and modification thereby are subjected to the constraint of claims.
Claims (24)
1. equipment that is used to control reciprocal compressor comprises:
Be used for calculating the stroke calculator of the stroke valuation of compressor based on current value that is applied to compressor electric motor and the magnitude of voltage that is applied to compressor electric motor;
Operating frequency reference value determining unit is used for stroke valuation integration and exports the integration stroke value, the mechanical resonance frequency that detects compressor based on the stroke valuation and the current value of integration, and the mechanical resonance frequency that is detected is defined as the operating frequency reference value; With
Controller is used for the current operating frequency that the definite operating frequency reference value of basis changes compressor.
2. equipment according to claim 1, wherein operating frequency reference value determining unit multiply by current value with the integration stroke valuation in one-period, and the compressor operation frequency that the summation that will work as product value detects when being 0 is defined as the operating frequency reference value.
3. equipment according to claim 2, wherein the operating frequency that detects when the summation of product value is 0 is consistent with the mechanical resonance frequency of compressor.
4. equipment according to claim 1, wherein the operating frequency reference value is in that (value that ∫ Xdt * i) calculates is the operation frequency value that recorded in 0 o'clock, and wherein ' X ' be the stroke valuation, and ' i ' is the current value that is applied to motor by the formula ∑.
5. equipment according to claim 1, if the summation that the integration stroke value wherein in one-period multiply by current value institute value greater than in the last week the valuation of interim integration stroke multiply by the summation of current value institute value, and current operating frequency is greater than before this operating frequency, then operating frequency reference value determining unit reduces current operating frequency continuously, then, will become the operating frequency that detected at 0 o'clock and be defined as the operating frequency reference value in the multiply each other summation of value of gained of the integration stroke valuation in the current period and current value.
6. equipment according to claim 1, if wherein the integration stroke valuation summation that multiply by current value institute value multiply by the summation of current value institute value greater than interim integration stroke valuation the last week, and current operating frequency is less than operating frequency before this, then operating frequency reference value determining unit increases continuously current operating frequency, then, will become the operating frequency that detected at 0 o'clock and be defined as the operating frequency reference value in the multiply each other summation of value of gained of the integration stroke valuation in the current period and current value.
7. equipment according to claim 1, if wherein the integration stroke valuation summation that multiply by current value institute value multiply by the summation of current value institute value less than interim integration stroke valuation the last week, and current operating frequency is less than operating frequency before this, then operating frequency reference value determining unit reduces current operating frequency continuously, then, will be that the operating frequency that detected in 0 o'clock is defined as the operating frequency reference value in the multiply each other summation of value of gained of the integration stroke valuation in the current period and current value.
8. equipment according to claim 1, if wherein the integration stroke valuation summation that multiply by current value institute value multiply by the summation of current value institute value less than interim integration stroke valuation the last week, and current operating frequency is greater than operating frequency before this, then operating frequency reference value determining unit increases continuously current operating frequency, then, will be that the operating frequency that detected in 0 o'clock is defined as the operating frequency reference value in the multiply each other summation of value of gained of the integration stroke valuation in the current period and current value.
9. equipment that is used to control operation of reciprocating compressor comprises:
Be used to detect the current detector of the electric current that is applied to compressor electric motor;
Be used to detect the voltage detector of the voltage that is applied to motor;
Be used for stroke calculator based on the stroke valuation of detected electric current and voltage and parameter of electric machine calculating compressor;
Operating frequency reference value determining unit is used for the valuation of integration stroke and exports the integration stroke value, based on the stroke valuation of integration with detect the mechanical resonance frequency that current value detects compressor, and determines that the mechanical resonance frequency that is detected is the operating frequency reference value;
Comparator is used for relatively from the stroke valuation and the stroke reference value of the output of stroke calculator, and according to comparative result output difference; With
Controller is used for changing current operating frequency and changing voltage on the motor that is applied to compressor according to the difference from comparator output according to described definite operating frequency reference value, thus the operation of control compressor.
10. equipment according to claim 9, wherein operating frequency reference value determining unit multiply by current value with the integration stroke value in one-period, and the operating frequency that will work as product and record when being 0 is defined as the operating frequency reference value.
11. a method that is used to control operation of reciprocating compressor comprises:
Based on current value that is applied to compressor electric motor and the voltage that is applied to motor, the stroke valuation of integration compressor is also exported the integration stroke value;
Mechanical resonance frequency based on integration stroke value and current value detection compressor;
Determine that this mechanical resonance frequency is the operating frequency reference value of compressor; With
Change the current operating frequency of compressor according to the operating frequency reference value of determining.
12. method according to claim 11, the step that wherein definite mechanical resonance frequency is the operating frequency reference value of compressor comprises:
A step, if the summation that the integration stroke value wherein in one-period multiply by current value institute value greater than in the last week the valuation of interim integration stroke multiply by the summation of current value institute value, and the current operating frequency of compressor is greater than before this operating frequency, then reduce current operating frequency continuously, and will become the operating frequency that detected at 0 o'clock and be defined as the operating frequency reference value in the multiply each other summation of value of gained of the integration stroke valuation in the current period and current value;
A step, if wherein the integration stroke valuation summation that multiply by current value institute value multiply by the summation of current value institute value greater than interim integration stroke valuation the last week, and current operating frequency is less than operating frequency before this, then increase continuously current operating frequency, and will become the operating frequency that detected at 0 o'clock and be defined as the operating frequency reference value in the multiply each other summation of value of gained of the integration stroke valuation in the current period and current value;
A step, if wherein the integration stroke valuation summation that multiply by current value institute value multiply by the summation of current value institute value less than interim integration stroke valuation the last week, and current operating frequency is less than operating frequency before this, then reduce current operating frequency continuously, and will be that the operating frequency that detected in 0 o'clock is defined as the operating frequency reference value in the multiply each other summation of value of gained of the integration stroke valuation in the current period and current value; With
A step, if wherein the integration stroke valuation summation that multiply by current value institute value multiply by the summation of current value institute value less than interim integration stroke valuation the last week, and current operating frequency is greater than operating frequency before this, then increase continuously current operating frequency, and will be that the operating frequency that detected in 0 o'clock is defined as the operating frequency reference value in the multiply each other summation of value of gained of the integration stroke valuation in the current period and current value.
13. an equipment that is used to control operation of reciprocating compressor comprises:
Be used for calculating the stroke calculator of the stroke valuation of compressor based on current value that is applied to compressor electric motor and the magnitude of voltage that is applied to compressor electric motor;
Operating frequency reference value determining unit is used for the integration current value and exports the current value of integration, detects the mechanical resonance frequency of compressor based on stroke valuation and integration current value, and determines that the mechanical resonance frequency that is detected is the operating frequency reference value; With
Controller is used for the current operating frequency that the definite operating frequency reference value of basis changes compressor.
14. equipment according to claim 13, wherein operating frequency reference value determining unit multiply by the current value of integration with the stroke valuation in one-period, and determines that the compressor operation frequency that detects when the summation of product value becomes maximum value is the operating frequency reference value.
15. equipment according to claim 14, wherein the operating frequency that is detected when the summation of product value becomes maximum is consistent with the mechanical resonance frequency of compressor.
16. equipment according to claim 13, wherein the operating frequency reference value is the operation frequency value that records during for maximum value in the value of calculating by formula ∑ (X * ∫ idt), and wherein ' X ' be the stroke valuation, and ' i ' is the current value that is applied to motor.
17. equipment according to claim 13, if the summation that integration current value institute value is multiply by in the stroke valuation wherein in one-period greater than in the last week interim stroke valuation multiply by the summation of integration current value institute value, and the current operating frequency of compressor is greater than before this operating frequency, then operating frequency reference value determining unit increases current operating frequency continuously, the operating frequency that the summation of the value that then, will be in one-period be obtained by stroke valuation and integration current value are multiplied each other detects when becoming maximum is defined as the operating frequency reference value.
18. equipment according to claim 13, if wherein the summation that integration current value institute value is multiply by in the stroke valuation in one-period multiply by the summation of integration current value institute value greater than interim stroke valuation the last week, and the current operating frequency of compressor is less than operating frequency before this, then operating frequency reference value determining unit reduces current operating frequency continuously, then, will be defined as the operating frequency reference value at the stroke valuation in the current period and the integration current value operating frequency that detects when the summation of value of gained becomes maximum that multiplies each other.
19. equipment according to claim 13, if wherein the summation that integration current value institute value is multiply by in the stroke valuation in one-period multiply by the summation of integration current value institute value less than interim stroke valuation the last week, and the current operating frequency of compressor is less than operating frequency before this, then operating frequency reference value determining unit increases continuously current operating frequency, the operating frequency that the summation of the value that then, will be in a current period be obtained by stroke valuation and integration current value are multiplied each other detects when becoming maximum is defined as the operating frequency reference value.
20. equipment according to claim 13, if wherein the summation that integration current value institute value is multiply by in the stroke valuation in one-period multiply by the summation of integration current value institute value less than interim stroke valuation the last week, and the current operating frequency of compressor is greater than operating frequency before this, then operating frequency reference value determining unit reduces current operating frequency continuously, the operating frequency that the summation of the value that then, will be in a current period be obtained by stroke valuation and integration current value are multiplied each other detects when becoming maximum is defined as the operating frequency reference value.
21. an equipment that is used to control operation of reciprocating compressor comprises:
Be used to detect the current detector of the electric current that is applied to compressor electric motor;
Be used to detect the voltage detector of the voltage that is applied to motor;
Be used for stroke calculator based on the stroke valuation of detected electric current and magnitude of voltage and parameter of electric machine calculating compressor;
Operating frequency reference value determining unit is used for the integration current value and exports the current value of integration, detects the mechanical resonance frequency of compressor based on stroke valuation and integration current value, and determines that the mechanical resonance frequency that is detected is the operating frequency reference value;
Comparator is used for relatively from the stroke valuation and the stroke reference value of the output of stroke calculator, and according to comparative result output difference; With
Controller is used for changing current operating frequency and changing voltage on the motor that is applied to compressor according to the difference from comparator output according to the operating frequency reference value of determining, thus the operation of control compressor.
22. equipment according to claim 21, wherein operating frequency reference value determining unit multiply by the integration current value with the stroke valuation in one-period, and will work as compressor operation frequency product and that record when maximum and be defined as the operating frequency reference value.
23. a method that is used to control operation of reciprocating compressor comprises:
Based on the stroke valuation of the current value that is applied to compressor electric motor with the magnitude of voltage calculating compressor that is applied to motor;
The integration current value is also exported the current value of integration;
Mechanical resonance frequency based on stroke valuation and integration current value detection compressor;
Determine that mechanical resonance frequency is the operating frequency reference value of compressor; With the current operating frequency that changes compressor according to the operating frequency reference value of determining.
24. method according to claim 23, the step that wherein definite mechanical resonance frequency is the operating frequency reference value comprises:
A step, if the summation that integration current value institute value is multiply by in the stroke valuation wherein in one-period greater than in the last week interim stroke valuation multiply by the summation of integration current value institute value, and the current operating frequency of compressor is greater than before this operating frequency, then increase continuously current operating frequency, and stroke valuation that will be in one-period and the integration current value operating frequency that detects when the summation of value of gained becomes maximum that multiplies each other is defined as the operating frequency reference value;
A step, if wherein the summation that integration current value institute value is multiply by in the stroke valuation in one-period multiply by the summation of integration current value institute value greater than interim stroke valuation the last week, and the current operating frequency of compressor is less than operating frequency before this, then reduce current operating frequency continuously, and will be defined as the operating frequency reference value at the stroke valuation in the current period and the integration current value operating frequency that detects when the summation of value of gained becomes maximum that multiplies each other;
A step, if wherein the summation that integration current value institute value is multiply by in the stroke valuation in one-period multiply by the summation of integration current value institute value less than interim stroke valuation the last week, and the current operating frequency of compressor is less than operating frequency before this, then increase continuously current operating frequency, and will be defined as the operating frequency reference value at the stroke valuation in the current period and the integration current value operating frequency that detects when the summation of value of gained becomes maximum that multiplies each other; And
A step, if wherein the summation that integration current value institute value is multiply by in the stroke valuation in one-period multiply by the summation of integration current value institute value less than interim stroke valuation the last week, and the current operating frequency of compressor is greater than operating frequency before this, then reduce current operating frequency continuously, and will be defined as the operating frequency reference value at the stroke valuation in the current period and the integration current value operating frequency that detects when the summation of value of gained becomes maximum that multiplies each other.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020040072827 | 2004-09-11 | ||
| KR1020040072826 | 2004-09-11 | ||
| KR1020040072826A KR100575691B1 (en) | 2004-09-11 | 2004-09-11 | Driving control apparatus and method for reciprocating compressor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1746501A CN1746501A (en) | 2006-03-15 |
| CN100441869C true CN100441869C (en) | 2008-12-10 |
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| CNB2005100550394A Expired - Fee Related CN100441869C (en) | 2004-09-11 | 2005-03-15 | Apparatus and method for controlling operation of compressor |
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| KR (1) | KR100575691B1 (en) |
| CN (1) | CN100441869C (en) |
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| KR101665695B1 (en) * | 2009-11-18 | 2016-10-13 | 엘지전자 주식회사 | Linear compressor |
| KR101717105B1 (en) * | 2010-07-29 | 2017-03-16 | 엘지전자 주식회사 | Refrigerator and controlling method of the same |
| CN107436018B (en) * | 2017-08-09 | 2019-01-29 | 珠海格力电器股份有限公司 | Improve control method, device and the air-conditioning of air conditioner piping air column resonance |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09112438A (en) * | 1995-10-20 | 1997-05-02 | Sanyo Electric Co Ltd | Driver of linear compressor |
| CN1400388A (en) * | 2001-07-31 | 2003-03-05 | Lg电子株式会社 | Stroke control mechanism and method for reciprocating compressor |
| CN1400389A (en) * | 2001-08-01 | 2003-03-05 | Lg电子株式会社 | Control mechanism and method for reciprocating compressor |
| CN1445455A (en) * | 2002-03-16 | 2003-10-01 | Lg电子株式会社 | Operatio control method of reciprocating compressor |
| CN1459921A (en) * | 2002-05-21 | 2003-12-03 | 松下电器产业株式会社 | Driving device for linear motor |
-
2004
- 2004-09-11 KR KR1020040072826A patent/KR100575691B1/en active IP Right Grant
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2005
- 2005-03-15 CN CNB2005100550394A patent/CN100441869C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09112438A (en) * | 1995-10-20 | 1997-05-02 | Sanyo Electric Co Ltd | Driver of linear compressor |
| CN1400388A (en) * | 2001-07-31 | 2003-03-05 | Lg电子株式会社 | Stroke control mechanism and method for reciprocating compressor |
| CN1400389A (en) * | 2001-08-01 | 2003-03-05 | Lg电子株式会社 | Control mechanism and method for reciprocating compressor |
| CN1445455A (en) * | 2002-03-16 | 2003-10-01 | Lg电子株式会社 | Operatio control method of reciprocating compressor |
| CN1459921A (en) * | 2002-05-21 | 2003-12-03 | 松下电器产业株式会社 | Driving device for linear motor |
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| Publication number | Publication date |
|---|---|
| CN1746501A (en) | 2006-03-15 |
| KR100575691B1 (en) | 2006-05-03 |
| KR20060023902A (en) | 2006-03-15 |
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