CN1844670A - Apparatus for controlling driving of reciprocating compressor and method thereof - Google Patents

Apparatus for controlling driving of reciprocating compressor and method thereof Download PDF

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Publication number
CN1844670A
CN1844670A CNA2006100738707A CN200610073870A CN1844670A CN 1844670 A CN1844670 A CN 1844670A CN A2006100738707 A CNA2006100738707 A CN A2006100738707A CN 200610073870 A CN200610073870 A CN 200610073870A CN 1844670 A CN1844670 A CN 1844670A
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China
Prior art keywords
stroke
frequency
phase difference
control signal
command value
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CNA2006100738707A
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Chinese (zh)
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CN100526644C (en
Inventor
洪彦杓
刘载有
李明烈
朴景培
李澈雄
宋桂永
崔基哲
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LG Electronics Inc
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LG Electronics Inc
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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
    • 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
    • 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
    • F04B49/065—Control using electricity and making use of computers
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • F04B2207/01—Load in general
    • 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
    • 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
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/021—Inverters therefor
    • 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
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/024—Compressor control by controlling the electric parameters, e.g. current or voltage

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Computer Hardware Design (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

Disclosed are an apparatus for controlling a driving of a reciprocating compressor capable of enhancing an efficiency by differently controlling a frequency and a stroke voltage according to a load size and capable of reducing consumption power, and a method thereof. The apparatus comprises a controlling unit for judging a load size by comparing a phase difference between a detected current and a stroke with a reference phase difference, and outputting a frequency control signal and a stroke control signal according to the judged load size.

Description

Control reciprocal compressor device driven and method
Technical field
The present invention relates to a kind of compressor, relate more specifically to a kind of control reciprocal compressor device driven and method.
Background technique
Usually, reciprocal compressor is not provided for converting to rotatablely moving the bent axle of linear motion, thereby has less frictional loss.Therefore, reciprocal compressor has higher compression efficiency than common compressor.
When reciprocal compressor is applied to refrigerator or air-conditioning, change its refrigeration capacity of compression ratio control by the stroke voltage that changes input.Here, stroke is represented the top dead center of piston and the distance between the lower dead center.
Below with reference to Fig. 1 traditional reciprocal compressor is described.
Fig. 1 is a block diagram, and the structure according to the control reciprocal compressor device driven of conventional art is shown.
As shown in the figure, traditional control reciprocal compressor device driven comprises: current probe 4 is used to detect the electric current of the motor (not shown) that offers reciprocal compressor 6; Voltage detector 3 is used to detect the voltage that offers motor; Stroke calculator 5 is used for calculating according to the parameter of detected electric current and voltage and motor the stroke assessed value of compressor; Comparator 1, the stroke assessed value that is used for calculating is compared with default stroke command value, thereby exports the difference between them; And journey controller 2, be used for changing the voltage that offers motor according to the turn-on cycle that this difference control is connected in series to the TRIAC (not shown) of motor, thus the stroke of control compressor 6.
Below, with reference to Fig. 1 operation according to the control reciprocal compressor device driven of conventional art is described.
Current probe 4 detects the electric current of the motor (not shown) that offers compressor 6, and detected current value is outputed to stroke calculator 5.Voltage detector 3 detects the voltage that offers motor, and detected magnitude of voltage is outputed to stroke calculator 5.
Stroke calculator 5 is applied to comparator 1 with the stroke assessed value (X) that calculates then by the following formula 1 of the parameter substitution of detected current value, detected magnitude of voltage and motor being calculated the stroke assessed value (X) of compressor.
X = 1 α ∫ ( V m - Ri - L i ‾ ) dt ------formula 1
Here, R represents resistance value, and L represents the motor inductance value, and α represents motor constant, V mRepresentative offers the voltage of motor, and the i representative offers the electric current of motor, the electric current that the i representative offers motor over time than.That is to say that i represents the differential value (di/dt) of i.
Then, comparator 1 is compared the stroke assessed value with the stroke command value, and the difference between them is applied to journey controller 2.
Journey controller 2 changes the voltage of the motor that offers compressor 6 according to this difference, thereby controls the stroke of compressor 6.
Fig. 2 is a flow chart, illustrates according to conventional art control reciprocal compressor method of driving.
When the stroke assessed value by stroke calculator 5 gained was applied to comparator 1 (S1), comparator 1 was compared the stroke assessed value with default stroke command value, thereby obtained the difference (S2) between them.Then, comparator 1 outputs to journey controller 2 with this difference.
When stroke assessed value during less than the stroke command value, journey controller 2 increases the voltage that will offer motor, with the stroke (S3) of control compressor.On the contrary, when stroke assessed value during greater than the stroke command value, journey controller 2 reduces the voltage (S4) that will offer motor.Here, journey controller 2 increases or reduces and will offer the voltage of motor by the turn-on cycle that control is electrically connected to the TRIAC (not shown) of motor.
The stroke command value changes according to the size of reciprocal compressor load.That is to say that when the load of reciprocal compressor was big, the stroke command value increased not reducing the stroke of piston, thereby prevents that refrigeration capacity from reducing.On the contrary, when the load of reciprocal compressor hour, the stroke command value reduces not increasing the stroke of piston, thereby prevents that refrigeration capacity from increasing, and prevents between piston and the cylinder because the mistake stroke produces collision.
When the stroke of piston is reduced to specified level, uses the conventional linear compressor efficiency of stroke voltage to reduce, thereby when changing capacity, be restricted.
The traditional rotary compressor that uses revolution motor is by changing the next change capacity at relative broad range of frequency.When changing frequency in less capacity change scope, the efficient of rotary compressor can sharply not reduce.On the contrary, when the stroke of piston hour, the efficient of reciprocal compressor reduces.
Summary of the invention
Therefore, the object of the present invention is to provide a kind of control reciprocal compressor device driven and method, it offers the electric current of reciprocal compressor by basis and the phase difference between the stroke is judged load, come controlling and driving frequency and stroke according to the load of judging then, thereby can improve the efficient of drive motor.
For obtaining according to these and other advantage that the invention is intended to, as this concrete implements and broadly described, the invention provides a kind of control reciprocal compressor device driven, comprise: control unit, be used for judging the load size by the phase difference between electric current and the stroke is compared with the reference phase difference, and according to result of determination output frequency control signal and Stroke Control signal; Driver frequency command value determining unit is used for determining the driver frequency command value according to this frequency control signal; Stroke command value determining unit is used for determining the stroke command value according to the trip control signal; First comparing unit is used for this driver frequency command value is compared with current driver frequency, and according to comparative result output frequency compensating signal; Second comparing unit is used for the trip command value is compared with current stroke, and according to comparative result delivery stroke compensating signal; The PWM control unit is used for exporting the pwm control signal that is used to change driver frequency and stroke according to this frequency compensation signal and the trip compensating signal; And inverter, be used for changing voltage and the driver frequency that offers motor according to this pwm control signal.
For obtaining according to these and other advantage that the invention is intended to, as this concrete implements and broadly described, the present invention also provides a kind of control reciprocal compressor method of driving, comprising: drive the reciprocal compressor that has corresponding to the capacity of specific stroke command value; Detection offers the electric current and the voltage of this reciprocal compressor motor, and calculates stroke by detected electric current and voltage; Phase difference between the stroke that detection computations goes out and this electric current; Detected phase difference is compared with the reference phase difference, and change stroke command value and driver frequency command value according to comparative result; Driver frequency command value after changing is compared with current driver frequency, and produce the frequency compensation signal according to comparative result; Stroke command value after changing is compared with current stroke, and produce the stroke compensating signal according to comparative result; According to this frequency compensation signal and the trip compensating signal, produce the pwm control signal that is used to change stroke voltage and driver frequency; And the stroke voltage and the driver frequency that offer this reciprocal compressor motor according to this pwm control signal change.
The following specifically describes for of the present invention in conjunction with the drawings, aforementioned and other purpose, feature, scheme and advantage of the present invention will be more apparent.
Description of drawings
The accompanying drawing that is included in the specification and constitutes a specification part provides for further understanding of the present invention, shows embodiments of the invention, and is used from specification one and explains principle of the present invention.
In the accompanying drawings:
Fig. 1 is a block diagram, and the structure according to the control reciprocal compressor device driven of conventional art is shown;
Fig. 2 is a flow chart, and the control reciprocal compressor method of driving according to conventional art is shown;
Fig. 3 is a block diagram, and the structure according to control reciprocal compressor device driven of the present invention is shown; And
Fig. 4 is a flow chart, illustrates according to control reciprocal compressor method of driving of the present invention.
Embodiment
In detail with reference to the preferred embodiments of the present invention, the example is illustrated in the accompanying drawing below.
Below, with reference to Fig. 3 and Fig. 4 control reciprocal compressor device driven and method are described, it can drive the reciprocal compressor of high capacity by the Linearkompressor with same capability, and by according to offering the electric current of reciprocal compressor and the phase difference between the stroke is judged the load size and can reduce energy consumption under the main drive condition by controlling current driver frequency and stroke according to result of determination.
Fig. 3 is a block diagram, and the structure according to control reciprocal compressor device driven of the present invention is shown.
As shown in the figure, control reciprocal compressor device driven according to the present invention comprises: voltage detection unit 100, current detecting unit 110, stroke detection unit 120, control unit 130, first comparing unit 170 and second comparing unit 140, stroke command value determining unit 150, driver frequency determining unit 160, PWM control unit 180, inverter 190, and power subsystem 200.
Current detecting unit 110 detects the electric current of linear compressor motor, and voltage detection unit 100 detects the voltage of linear compressor motor.
Stroke detection unit 120 calculates stroke by detected electric current and voltage.
Whether control unit 130 is compared the phase difference between detected electric current and the stroke with the reference phase difference, come the judged result value corresponding to high capacity.Then, control unit 130 is according to result of determination output frequency control signal and Stroke Control signal.
First example as control unit 130, when the phase difference between detected electric current and the stroke during less than the reference phase difference, control unit 130 judges that the load of reciprocal compressor is high capacity, and output is used for current driver frequency is changed into the frequency control signal of the driver frequency bigger than resonant frequency.
Second example as control unit 130, when the phase difference between detected electric current and the stroke during less than the reference phase difference, control unit 130 judges that the load of reciprocal compressor is high capacity, and output is used for current stroke is changed into the Stroke Control signal of full stroke.
The 3rd example as control unit 130, when the phase difference between detected electric current and the stroke during less than the reference phase difference, control unit 130 judges that the load of reciprocal compressor is high capacity, and export the frequency control signal that is used for current driver frequency is changed into the driver frequency bigger than resonant frequency, and output is used for current stroke is changed into the Stroke Control signal of full stroke.
The 4th example as control unit 130, when the phase difference between detected electric current and the stroke during greater than the reference phase difference, control unit 130 judges that the load of reciprocal compressor is standard load (low load or a medium load), and output is used for the Stroke Control signal of change capacity (capacity in 30% to 90% scope of maximum capacity).
The 5th example as control unit 130, when the phase difference between detected electric current and the stroke during greater than the reference phase difference, control unit 130 judges that the load of reciprocal compressor is standard load (low load or a medium load), and output is used for current driver frequency is changed into the frequency control signal of resonant frequency.
The 6th example as control unit 130, when the phase difference between detected electric current and the stroke during greater than the reference phase difference, control unit 130 judges that the load of reciprocal compressor is standard load (low load or a medium load), and export the Stroke Control signal that is used to change capacity, and output is used for current driver frequency is changed into the frequency control signal of resonant frequency.
In order to detect resonant frequency, control unit 130 change frequencies and stroke are so that the phase difference between detected electric current and the stroke can be 90 °, perhaps change frequency and stroke so that the speed of reciprocal compressor and the phase difference between the electric current can be 0 °, perhaps directly calculate the gas spring constant.
By detecting user's setting temperature or external temperature, control unit 130 can produce load by the test value that prestores.
Driver frequency command value determining unit 160 is identified for changing the driver frequency command value of driver frequency according to frequency control signal.
Stroke command value determining unit 150 is identified for changing the stroke command value of stroke according to the Stroke Control signal.
First comparing unit 170 is compared this driver frequency command value with current driver frequency, and according to comparative result output frequency compensating signal.
Second comparing unit 140 is compared the trip command value with current stroke, and according to comparative result delivery stroke compensating signal.
PWM control unit 180 is used to change the pwm control signal of driver frequency and stroke according to this frequency compensation signal and the output of stroke compensating signal.
Here, pwm control signal comprises: the PWM dutycycle changes signal, is used to change the stroke voltage that offers the reciprocal compressor motor; And PWM period changing signal, be used to change the frequency of the voltage that offers reciprocal compressor.
Inverter 190 changes voltage and the driver frequency that offers the reciprocal compressor motor according to pwm control signal.
Inverter 190 is used for producing AC (interchange) electric power of optional frequency by using supply voltage (AC 50Hz or 60Hz), changes the speed of motor.Use inverter 190 to have the following advantages.At first, change the speed of reciprocal compressor motor easily, can be energy-conservation, and pass through to use low frequency but not the efficient of high-frequency energy raising reciprocal compressor.
That is to say that inverter 190 is by the ON/OFF time of pwm control signal control internal switch device, and change the frequency of DC (direct current) electric power and from the voltage of the motor that offers reciprocal compressor of power subsystem 200 outputs.
Here, 200 pairs of AC power rectifier of power subsystem and carry out level and smooth, thereby produce specific DC electric power.
Below, describe the operation of this control reciprocal compressor device driven in detail with reference to Fig. 4.
Fig. 4 is a flow chart, illustrates according to control reciprocal compressor method of driving of the present invention.
At first, drive the motor (SP11) of reciprocal compressor with specific stroke command value.
Then, current detecting unit 110 detects the electric current of reciprocal compressor motor, and voltage detection unit 100 detects the voltage (SP12) of reciprocal compressor motor.
Then, stroke detection unit 120 uses detected electric current and detected voltage to calculate stroke (SP13).
Then, control unit 130 detects the phase difference (SP14) between detected electric currents and the stroke, and with this phase difference compare with the reference phase difference (SP15).
By test the reference phase difference is set at and has optimum value.
When the load of reciprocal compressor increased, the gas spring constant increased, so the phase difference between electric current and the stroke reduces.
That is to say, when the phase difference between electric current and the stroke is 90 °, produce resonant frequency corresponding to medium load.In addition, when the phase difference between electric current and the stroke is 60 °, produce the resonant frequency corresponding to high capacity, this resonant frequency confirms through test.
Therefore, setting the reference phase difference is the value that has greater than 60 °.
The reference phase difference is set in the some place littler than the point of TDC=0.
TDC represents the top dead center of the piston of reciprocal compressor, and the position of piston of stroke has been finished in expression.
, TDC locates the efficient maximum of reciprocal compressor when being positioned at " 0 ".Therefore, reciprocal compressor is controlled as the some place that makes piston can be positioned at TDC=0.
As an example, when the phase difference between electric current and the stroke during less than the reference phase difference, control unit 130 judges that the load of reciprocal compressor is high capacity, and output is used for current driver frequency is changed into the frequency control signal of the driver frequency bigger than resonant frequency.
As another example, when the phase difference between electric current and the stroke during less than the reference phase difference, control unit 130 judges that the load of reciprocal compressors is high capacity, and output is used for current stroke is changed into the Stroke Control signal of full stroke.
As an example again, when the phase difference between electric current and the stroke during less than the reference phase difference, control unit 130 judges that the load of reciprocal compressor is high capacity, output is used for current driver frequency is changed into the frequency control signal of the driver frequency bigger than resonant frequency, and output is used for current stroke is changed into the Stroke Control signal (SP22) of full stroke.
The Stroke Control signal that stroke command value determining unit 150 bases are exported from control unit 130 is identified for current stroke is changed into the stroke command value of full stroke, and the trip command value is offered second comparing unit 140 (SP17).
Driver frequency command value determining unit 160 will be defined as the driver frequency command value greater than the driver frequency of resonant frequency, and this driver frequency command value will be offered first comparing unit 170 (SP18) according to the frequency control signal from control unit 130 outputs.
Set and load size corresponding driving frequency instruction value by test.
First comparing unit 170 is compared the driver frequency command value with current driver frequency, and will offer PWM control unit 180 (SP19) with comparative result correspondent frequency compensating signal.
Second comparing unit 140 is compared the stroke command value with current stroke, and will offer PWM control unit 180 (SP19) with the corresponding stroke compensating signal of comparative result.
Then, PWM control unit 180 will offer inverter 190 (SP20) with the frequency compensation signal of first comparing unit, 170 outputs and the stroke compensating signal corresponding PWM of second comparing unit, 140 outputs.Inverter 190 changes stroke voltage and the driver frequency (SP21) that offers the reciprocal compressor motor according to this pwm control signal.
As an example, when the phase difference between electric current that offers the reciprocal compressor motor and the stroke during greater than the reference phase difference, control unit 130 judges that the load of reciprocal compressors is standard load (medium load or low load), and output is used to change the Stroke Control signal of the driving capacity of reciprocal compressor.
As another example, when the phase difference between electric current that offers the reciprocal compressor motor and the stroke during greater than the reference phase difference, control unit 130 outputs are used for driver frequency is changed into the frequency control signal of resonant frequency.
As preferred embodiment, when the phase difference between electric current that offers the reciprocal compressor motor and the stroke during greater than the reference phase difference, control unit 130 judges that the load of reciprocal compressor is standard load (medium load or low load), output is used for current driver frequency is changed into the frequency control signal of resonant frequency, and output is used to change the Stroke Control signal (SP16) of the driving capacity of reciprocal compressor.
Stroke command value determining unit 150 is according to the Stroke Control signal from control unit 130 outputs, be identified for the driving capacity of reciprocal compressor is changed into stroke command value corresponding to the driving capacity of present load, and the trip command value is offered second comparing unit 140 (SP17).
Driver frequency command value determining unit 160 is defined as the driver frequency command value with resonant frequency, and this driver frequency command value is offered first comparing unit 170 (SP18) according to the frequency control signal from control unit 130 outputs.
First comparing unit 170 is compared this driver frequency command value with current driver frequency, and will offer PWM control unit 180 (SP19) with comparative result correspondent frequency compensating signal.
Second comparing unit 140 is compared the trip command value with current stroke, and will offer PWM control unit 180 (SP19) with the corresponding stroke compensating signal of comparative result.
Then, PWM control unit 180 will offer inverter 190 (SP20) with the frequency compensation signal of first comparing unit, 170 outputs and the stroke compensating signal corresponding PWM of second comparing unit, 140 outputs.Inverter 190 changes stroke voltage and the driver frequency (SP21) that offers the reciprocal compressor motor according to pwm control signal.
In the present invention, electric current by will offering reciprocal compressor and the phase difference between the stroke are compared with the reference phase difference and are judged the size of present load.If present load is judged as high capacity, then current driver frequency becomes the driver frequency greater than resonant frequency, and current stroke becomes full stroke.Therefore, have the reciprocal compressor of same capability by use, can be corresponding to the load of more than high capacity.
In addition, in the present invention, electric current by will offering reciprocal compressor and the phase difference between the stroke are compared with the reference phase difference and are judged the size of present load.If present load is judged as medium load or low load, then output is used to change the Stroke Control signal of capacity, and current driver frequency becomes resonant frequency.Therefore, under the main drive condition of refrigerator or air-conditioning, can cut down the consumption of energy.
That is to say, in reciprocal compressor of the present invention, always do not produce maximum refrigeration capacity, but produce essential refrigeration capacity by the control stroke.Therefore, can cut down the consumption of energy.
As previously mentioned, in control reciprocal compressor device driven according to the present invention and method, electric current by will offering reciprocal compressor and the phase difference between the stroke are compared with the reference phase difference and are judged the size of present load.If present load is judged as high capacity, then current driver frequency becomes the driver frequency greater than resonant frequency, and current stroke becomes full stroke.Therefore, have the reciprocal compressor of same capability by use, can be corresponding to the load of more than high capacity, thus can improve the efficient of reciprocal compressor.
In addition, in the present invention, electric current by will offering reciprocal compressor and the phase difference between the stroke are compared with the reference phase difference and are judged the size of present load.If present load is judged as medium load or low load, then output is used to change the Stroke Control signal of capacity, and current driver frequency becomes resonant frequency.Therefore, under the main drive condition of refrigerator or air-conditioning, can cut down the consumption of energy.
Because the present invention can be presented as various ways and not break away from its spirit or substantive features, therefore be to be understood that, unless otherwise prescribed, the foregoing description is not limited to aforesaid any details, and should in the spirit and scope that claim limited of enclosing, constitute widely, the whole variations and the remodeling that therefore fall in claim and the equivalent scope all should be contained in the claim of enclosing.

Claims (10)

1, a kind of control reciprocal compressor device driven comprises:
Control unit is used for judging the load size by the phase difference between detected electric current and the stroke is compared with the reference phase difference, and is used for coming output frequency control signal and Stroke Control signal according to the load size of being judged.
2, device as claimed in claim 1, wherein when the phase difference between detected electric current and the stroke during less than this reference phase difference, the output of this control unit is used for current stroke is changed into the Stroke Control signal of full stroke, and output is used for current driver frequency is changed into frequency control signal greater than the driver frequency of resonant frequency; And when the phase difference between detected electric current and the stroke during greater than this reference phase difference, this control unit output is used to change the Stroke Control signal of capacity, and output is used for current driver frequency is changed into the frequency control signal of resonant frequency.
3, a kind of control reciprocal compressor device driven comprises:
Control unit is used for judging the load size by the phase difference between electric current and the stroke is compared with the reference phase difference, and according to result of determination output frequency control signal and Stroke Control signal;
Driver frequency command value determining unit is used for determining the driver frequency command value according to this frequency control signal;
Stroke command value determining unit is used for determining the stroke command value according to the trip control signal;
First comparing unit is used for this driver frequency command value is compared with current driver frequency, and according to comparative result output frequency compensating signal;
Second comparing unit is used for the trip command value is compared with current stroke, and according to comparative result delivery stroke compensating signal;
The PWM control unit is used for exporting the pwm control signal that is used to change driver frequency and stroke according to this frequency compensation signal and the trip compensating signal; And
Inverter is used for changing voltage and the driver frequency that offers motor according to this pwm control signal.
4, device as claimed in claim 3, wherein when the phase difference between detected electric current and the stroke during less than this reference phase difference, the output of this control unit is used for current stroke is changed into the Stroke Control signal of full stroke, and output is used for current driver frequency is changed into frequency control signal greater than the driver frequency of resonant frequency; And the phase difference between this detected electric current and the stroke is during greater than this reference phase difference, and this control unit output is used to change the Stroke Control signal of capacity, and output is used for current driver frequency is changed into the frequency control signal of resonant frequency.
5, device as claimed in claim 3, wherein this pwm control signal comprises: the PWM dutycycle changes signal, is used to change stroke voltage; And PWM period changing signal, be used to change the frequency of the stroke voltage that offers this reciprocal compressor.
6, a kind of control reciprocal compressor method of driving comprises:
Driving has the reciprocal compressor corresponding to the capacity of specific stroke command value;
Detection offers the electric current and the voltage of this reciprocal compressor motor, and calculates stroke by detected electric current and voltage;
Phase difference between stroke that detection computations goes out and the detected electric current; And
Detected phase difference is compared with the reference phase difference, and change stroke command value and driver frequency command value according to comparative result.
7, method as claimed in claim 6, the step that wherein changes stroke command value and driver frequency command value comprises:
When the phase difference between detected this electric current and the stroke during, current driver frequency is changed into driver frequency greater than resonant frequency, and current stroke is changed into full stroke less than this reference phase difference; And
When the phase difference between detected this electric current and the stroke during, thereby change the driving capacity that stroke changes this reciprocal compressor, and current driver frequency is changed into resonant frequency greater than this reference phase difference.
8, a kind of control reciprocal compressor method of driving comprises:
Driving has the reciprocal compressor corresponding to the capacity of specific stroke command value;
Detection offers the electric current and the voltage of this reciprocal compressor motor, and calculates stroke by detected electric current and voltage;
Phase difference between the stroke that detection computations goes out and this electric current;
Detected phase difference is compared with the reference phase difference, and change stroke command value and driver frequency command value according to comparative result;
Driver frequency command value after changing is compared with current driver frequency, and produce the frequency compensation signal according to comparative result;
Stroke command value after changing is compared with current stroke, and produce the stroke compensating signal according to comparative result;
According to this frequency compensation signal and the trip compensating signal, produce the pwm control signal that is used to change stroke voltage and driver frequency; And
Change stroke voltage and the driver frequency that offers this reciprocal compressor motor according to this pwm control signal.
9, method as claimed in claim 8, the step that wherein changes stroke command value and driver frequency command value comprises:
When the phase difference between detected this electric current and the stroke during greater than this reference phase difference, output is used to change the Stroke Control signal of capacity, and output is used for current driver frequency is changed into the frequency control signal of resonant frequency; And
When the phase difference between detected this electric current and the stroke during less than this reference phase difference, output is used for current stroke is changed into the Stroke Control signal of full stroke, and output is used for current driver frequency is changed into frequency control signal greater than the driver frequency of resonant frequency.
10, method as claimed in claim 8, wherein this pwm control signal comprises: the PWM dutycycle changes signal, is used to change stroke voltage; And PWM period changing signal, be used to change the frequency of the stroke voltage that offers this reciprocal compressor.
CNB2006100738707A 2005-04-08 2006-04-06 Apparatus for controlling driving of reciprocating compressor and method thereof Expired - Fee Related CN100526644C (en)

Applications Claiming Priority (3)

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KR1020050029615A KR100631568B1 (en) 2005-04-08 2005-04-08 Driving control apparatus and method for reciprocating compressor
KR1020050029615 2005-04-08
KR1020060025468 2006-03-20

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106837736A (en) * 2015-11-27 2017-06-13 Lg电子株式会社 Compressor and the method for controlling the compressor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106837736A (en) * 2015-11-27 2017-06-13 Lg电子株式会社 Compressor and the method for controlling the compressor
US10436191B2 (en) 2015-11-27 2019-10-08 Lg Electronics Inc. Compressor and method for controlling the same
CN106837736B (en) * 2015-11-27 2020-02-18 Lg电子株式会社 Compressor and method for controlling the same

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