CN114744943A - Refrigerator and starting optimization method of motor - Google Patents

Refrigerator and starting optimization method of motor Download PDF

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Publication number
CN114744943A
CN114744943A CN202210372182.XA CN202210372182A CN114744943A CN 114744943 A CN114744943 A CN 114744943A CN 202210372182 A CN202210372182 A CN 202210372182A CN 114744943 A CN114744943 A CN 114744943A
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China
Prior art keywords
electromotive force
motor
axis
preset
angle
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CN202210372182.XA
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Chinese (zh)
Inventor
李秀军
侯同尧
赵强
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Hisense Shandong Refrigerator Co Ltd
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Hisense Shandong Refrigerator Co Ltd
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Priority to CN202210372182.XA priority Critical patent/CN114744943A/en
Publication of CN114744943A publication Critical patent/CN114744943A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
    • H02P21/34—Arrangements for starting
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D29/00—Arrangement or mounting of control or safety devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
    • H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
    • H02P21/18—Estimation of position or speed
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/022—Synchronous motors
    • H02P25/024—Synchronous motors controlled by supply frequency
    • H02P25/026—Synchronous motors controlled by supply frequency thereby detecting the rotor position
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/14—Electronic commutators
    • H02P6/16—Circuit arrangements for detecting position
    • H02P6/18—Circuit arrangements for detecting position without separate position detecting elements
    • H02P6/182—Circuit arrangements for detecting position without separate position detecting elements using back-emf in windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/20—Arrangements for starting
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2600/00—Control issues
    • F25D2600/06—Controlling according to a predetermined profile
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2205/00—Indexing scheme relating to controlling arrangements characterised by the control loops
    • H02P2205/01—Current loop, i.e. comparison of the motor current with a current reference
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2205/00—Indexing scheme relating to controlling arrangements characterised by the control loops
    • H02P2205/07—Speed loop, i.e. comparison of the motor speed with a speed reference
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2207/00—Indexing scheme relating to controlling arrangements characterised by the type of motor
    • H02P2207/05—Synchronous machines, e.g. with permanent magnets or DC excitation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

The invention discloses a refrigerator and a starting optimization method of a motor, wherein the refrigerator comprises the following steps: the driving mechanism of the compressor is a motor; a controller to: when a starting instruction is received, controlling a rotor of the motor to rotate; after the rotor is determined to rotate to a positioning angle, controlling the motor to carry out dragging starting; detecting back electromotive force parameters and rotating speeds of the motor when a rotor of the motor rotates to N preset angles in the dragging process of the motor; selecting a target angle from the N preset angles according to the size relationship between the back electromotive force parameters corresponding to the N preset angles and a preset interval and the size relationship between the rotating speed corresponding to the N preset angles and a preset threshold; and correcting the positioning angle into the target angle. By adopting the embodiment of the invention, the problem that the compressor is difficult to start or cannot be started can be effectively solved.

Description

Refrigerator and starting optimization method of motor
Technical Field
The invention relates to the technical field of household appliances, in particular to a refrigerator and a starting optimization method of a motor.
Background
At present, a motor of a compressor such as a refrigerator and an air conditioner or a motor of a washing machine and the like usually adopts Field-Oriented Control (FOC) to realize frequency conversion Control, and the FOC can accurately Control the size and the direction of a magnetic Field, so that the motor has stable torque, low noise, high efficiency and high-speed dynamic response. In controlling the operation of the motor by the FOC, the starting process of the motor generally includes several stages of positioning, dragging, and closed-loop control. The positioning angle of the motor in the positioning stage is generally a fixed predetermined angle, and when the motor is started with a large load, the fixed predetermined angle easily causes difficulty in starting the compressor or incapability of starting the compressor.
Disclosure of Invention
The embodiment of the invention provides a refrigerator and a starting optimization method of a motor, which can effectively solve the problem that a compressor is difficult to start or cannot be started.
An embodiment of the present invention provides a refrigerator including:
the driving mechanism of the compressor is a motor;
a controller to:
when a starting instruction is received, controlling a rotor of the motor to rotate;
after the rotor is determined to rotate to a positioning angle, controlling the motor to carry out dragging starting;
detecting back electromotive force parameters and rotating speeds of the motor when a rotor of the motor rotates to N preset angles in the dragging process of the motor;
selecting a target angle from the N preset angles according to the size relation between the back electromotive force parameters corresponding to the N preset angles and a preset interval and the size relation between the rotating speed corresponding to the N preset angles and a preset threshold value;
and correcting the positioning angle into the target angle.
Compared with the prior art, in the refrigerator disclosed by the embodiment of the invention, the counter electromotive force parameters and the rotating speed of the motor when the rotor of the motor rotates to N preset angles are detected in the dragging process of the motor of the compressor, the target angle is selected from the N preset angles according to the size relationship between the counter electromotive force parameters corresponding to the N preset angles and the preset interval and the size relationship between the rotating speed corresponding to the N preset angles and the preset threshold value, and then the positioning angle of the motor in the positioning stage is corrected to be the target angle, so that the motor can be ensured to be started at the optimal positioning angle, and the problem that the compressor is difficult to start or cannot be started is effectively solved.
As an improvement of the above scheme, according to a magnitude relationship between the back electromotive force parameters corresponding to the N preset angles and a preset interval, and a magnitude relationship between the rotation speed corresponding to the N preset angles and a preset threshold, a target angle is selected from the N preset angles, specifically:
and for the characteristic parameters at the N preset angles, if the back electromotive force parameter corresponding to a certain preset angle is in a preset interval and/or the rotating speed corresponding to the preset angle is not lower than a preset threshold, determining that the preset angle is a target angle.
In this embodiment, by selecting a preset angle at which the back electromotive force parameter is within a preset interval and/or the rotation speed is not lower than a preset threshold as an optimal starting target angle, it can be ensured that the back electromotive force parameter and/or the rotation speed meet requirements when the motor is started at the selected positioning angle, thereby achieving optimal starting.
As an improvement of the above scheme, the back electromotive force parameter is a ratio of d-axis back electromotive force to q-axis back electromotive force of the motor;
the preset interval is 20% to 60%.
In this embodiment, the back electromotive force parameter is a ratio of a d-axis back electromotive force to a q-axis back electromotive force of the motor, and the preset interval is 20% to 60%, so that the situation that the motor cannot be normally started due to stalling during starting can be prevented.
As an improvement of the above scheme, the back electromotive force parameter corresponding to any preset angle is specifically obtained by the following method:
obtaining stator current and stator voltage of an alpha axis and a beta axis of the motor when a rotor of the motor rotates to the preset angle;
calculating alpha axis counter electromotive force and beta axis counter electromotive force according to the alpha axis stator current and the beta axis stator voltage, and the pre-acquired stator resistance and stator inductance of the motor;
calculating to obtain d-axis counter electromotive force and q-axis counter electromotive force according to the preset angle, the alpha-axis counter electromotive force and the beta-axis counter electromotive force;
and calculating the ratio of the d-axis counter electromotive force to the q-axis counter electromotive force to obtain the counter electromotive force parameter corresponding to the preset angle.
In this embodiment, by obtaining the stator current and the stator voltage of the α axis and the β axis when the rotor of the motor rotates to a certain preset angle, and combining the stator resistance and the stator inductance of the motor obtained in advance, the α axis counter electromotive force and the β axis counter electromotive force are calculated, and then combining the α axis counter electromotive force, the β axis counter electromotive force and the preset angle, the d axis counter electromotive force and the q axis counter electromotive force corresponding to the preset angle are calculated, so that the counter electromotive force parameter corresponding to the preset angle can be accurately calculated, and the accuracy of the optimal positioning angle is improved.
As an improvement of the above scheme, the calculation formula of the α -axis back electromotive force is:
Eα＝Vα–RsIα–LsdIα/dt；
the calculation formula of the beta axis counter electromotive force is as follows:
Eβ＝Vβ–RsIβ–LsdIβ/dt；
the calculation formula of the d-axis back electromotive force is as follows:
Ed＝Eαcos(θesti)+Eβsin(θesti)；
the calculation formula of the q-axis counter electromotive force is as follows:
Eq＝Eβcos(θesti)-Eαsin(θesti)；
wherein E isαIs the alpha axis back electromotive force; eβThe beta axis counter electromotive force respectively; vαIs the alpha axis stator voltage of the motor; vβIs a beta axis stator voltage of the motor; i isαIs an alpha-axis stator current of the motor; i isβIs a beta axis stator current of the motor; r issIs a stator resistance of the motor; l issIs a stator inductance of the electric machine; edIs the d-axis back electromotive force; eqIs the q-axis back electromotive force; thetaestiIs the preset angle.
Another embodiment of the present invention provides a method for optimizing starting of a motor, including:
when a starting instruction is received, controlling a rotor of the motor to rotate;
after the rotor is determined to rotate to a positioning angle, controlling the motor to carry out dragging starting;
detecting back electromotive force parameters and rotating speeds of the motor when a rotor of the motor rotates to N preset angles in the dragging process of the motor;
selecting a target angle from the N preset angles according to the size relationship between the back electromotive force parameters corresponding to the N preset angles and a preset interval and the size relationship between the rotating speed corresponding to the N preset angles and a preset threshold;
and correcting the positioning angle into the target angle.
Compared with the prior art, the starting optimization method of the motor disclosed by the embodiment of the invention has the advantages that the counter electromotive force parameters and the rotating speed of the motor when the rotor of the motor rotates to N preset angles are detected in the dragging process of the motor, the target angle is selected from the N preset angles according to the size relationship between the counter electromotive force parameters corresponding to the N preset angles and the preset interval and the size relationship between the rotating speed corresponding to the N preset angles and the preset threshold value, and then the positioning angle of the motor in the positioning stage is corrected to be the target angle, so that the motor can be started at the optimal positioning angle, and the problem that the compressor is difficult to start or cannot be started is effectively solved.
As an improvement of the above scheme, according to a magnitude relationship between the back electromotive force parameters corresponding to the N preset angles and a preset interval, and a magnitude relationship between the rotation speed corresponding to the N preset angles and a preset threshold, a target angle is selected from the N preset angles, specifically:
and for the characteristic parameters at the N preset angles, if the back electromotive force parameter corresponding to a certain preset angle is in a preset interval and/or the rotating speed corresponding to the preset angle is not lower than a preset threshold, determining that the preset angle is a target angle.
In this embodiment, by selecting a preset angle at which the back electromotive force parameter is within a preset interval and/or the rotation speed is not lower than a preset threshold as an optimal starting target angle, it can be ensured that the back electromotive force parameter and/or the rotation speed meet requirements when the motor is started at the selected positioning angle, thereby achieving optimal starting.
As an improvement of the above scheme, the back electromotive force parameter is a ratio of d-axis back electromotive force to q-axis back electromotive force of the motor;
the preset interval is 20% to 60%.
In this embodiment, the back electromotive force parameter is a ratio of a d-axis back electromotive force to a q-axis back electromotive force of the motor, and the preset interval is 20% to 60%, which can ensure that the motor is prevented from being locked during starting and unable to be started normally.
As an improvement of the above scheme, the back electromotive force parameter corresponding to any preset angle is specifically obtained by the following method:
obtaining stator current and stator voltage of an alpha axis and a beta axis of the motor when a rotor of the motor rotates to the preset angle;
calculating alpha axis counter electromotive force and beta axis counter electromotive force according to the alpha axis stator current and the beta axis stator voltage, and the pre-acquired stator resistance and stator inductance of the motor;
calculating to obtain d-axis counter electromotive force and q-axis counter electromotive force according to the preset angle, the alpha-axis counter electromotive force and the beta-axis counter electromotive force;
and calculating the ratio of the d-axis counter electromotive force to the q-axis counter electromotive force to obtain the counter electromotive force parameter corresponding to the preset angle.
In this embodiment, by obtaining the stator current and the stator voltage of the α axis and the β axis when the rotor of the motor rotates to a certain preset angle, and combining the stator resistance and the stator inductance of the motor obtained in advance, the α axis counter electromotive force and the β axis counter electromotive force are calculated, and then combining the α axis counter electromotive force, the β axis counter electromotive force and the preset angle, the d axis counter electromotive force and the q axis counter electromotive force corresponding to the preset angle are calculated, so that the counter electromotive force parameter corresponding to the preset angle can be accurately calculated, and the accuracy of the optimal positioning angle is improved.
As an improvement of the above scheme, the calculation formula of the α -axis back electromotive force is:
Eα＝Vα–RsIα–LsdIα/dt；
the calculation formula of the beta axis counter electromotive force is as follows:
Eβ＝Vβ–RsIβ–LsdIβ/dt；
the calculation formula of the d-axis back electromotive force is as follows:
Ed＝Eαcos(θesti)+Eβsin(θesti)；
the calculation formula of the q-axis counter electromotive force is as follows:
Eq＝Eβcos(θesti)-Eαsin(θesti)；
wherein, EαIs the alpha axis back electromotive force; eβThe beta axis counter electromotive force respectively; vαIs the alpha axis stator voltage of the motor; vβIs a beta axis stator voltage of the motor; i isαIs an alpha-axis stator current of the motor; i isβIs a beta axis stator current of the motor; rsIs a stator resistance of the motor; l issBeing said motorA stator inductance; edIs the d-axis back electromotive force; eqIs the q-axis back electromotive force; thetaestiIs the preset angle.
Drawings
Fig. 1 is a schematic structural diagram of a refrigerator according to an embodiment of the present invention;
fig. 2 is a schematic view of an internal structure of a refrigerator according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a compressor according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of an FOC control circuit according to an embodiment of the present invention;
fig. 5 is a schematic flowchart illustrating a specific process of a controller of a refrigerator according to an embodiment of the present invention;
fig. 6 is a schematic flowchart of a method for optimizing starting of a motor according to an embodiment of the present invention;
fig. 7 is a schematic flowchart of a method for optimizing starting of a motor according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Fig. 1 is a schematic structural diagram of a refrigerator according to an embodiment of the present invention.
An embodiment of the present invention provides a refrigerator including:
a compressor 100 whose driving mechanism is a motor 101;
a controller 200 for:
when a starting instruction is received, controlling the rotor of the motor 101 to rotate;
after the rotor is determined to rotate to a positioning angle, controlling the motor 101 to perform dragging starting;
in the dragging process of the motor 101, detecting back electromotive force parameters and rotating speeds of the motor 101 when a rotor of the motor 101 rotates to N preset angles;
selecting a target angle from the N preset angles according to the size relation between the back electromotive force parameters corresponding to the N preset angles and a preset interval and the size relation between the rotating speed corresponding to the N preset angles and a preset threshold value;
and correcting the positioning angle to be the target angle.
In the present embodiment, N preset angles may be selected according to actual situations, and N is usually greater than or equal to 3. For example, the increment angle may be 1, that is, N preset angles are 0, 1, 2, and 3 … … 360 degrees, respectively, or the increment angle may be 30, that is, N preset angles are 0, 30, and 60 … … 360 degrees, respectively, which is not limited herein, and N is greater than or equal to 3.
Illustratively, referring to FIG. 2, the compressor 100 is generally located at the bottom most rear of the refrigerator, and the housing is secured to the bottom plate and is connected to the refrigeration circuit of the refrigerator by two ports.
In a specific implementation manner, the refrigerator provided by the embodiment of the invention can further comprise a condenser, a condensation preventing pipe, a drying filter, a capillary tube, an evaporator and a gas-liquid separator. The working process of the refrigeration of the refrigerator provided by the embodiment comprises a compression process, a condensation process, a throttling process and an evaporation process. Wherein, the compression process is as follows: a power line of the refrigerator is plugged, and when a contact of the temperature controller is turned on, the compressor 100 starts to operate, a low-temperature and low-pressure refrigerant is sucked by the compressor 100, and is compressed into a high-temperature and high-pressure superheated gas in a cylinder of the compressor 100 and then discharged into a condenser; the condensation process is as follows: the high-temperature and high-pressure refrigerant gas is radiated by the condenser, the temperature is continuously reduced, the refrigerant gas is gradually cooled to be saturated vapor with normal temperature and high pressure, the refrigerant gas is further cooled to be saturated liquid, the temperature is not reduced any more, the temperature at the moment is called as the condensation temperature, and the pressure of the refrigerant in the whole condensation process is almost unchanged; the throttling process is as follows: the condensed refrigerant saturated liquid flows into a capillary tube after being filtered by a drying filter to remove moisture and impurities, throttling and pressure reduction are carried out through the capillary tube, and the refrigerant is changed into normal-temperature low-pressure wet vapor; the evaporation process is as follows: the normal temperature and low pressure wet steam starts to absorb heat to vaporize in the evaporator, which not only reduces the temperature of the evaporator and the surrounding area, but also changes the refrigerant into low temperature and low pressure gas, the refrigerant from the evaporator returns to the compressor 100 after passing through the gas-liquid separator, and the above processes are repeated to transfer the heat in the refrigerator to the air outside the refrigerator, thereby achieving the purpose of refrigeration.
Illustratively, the compressor 100 of the refrigerator provided in the present embodiment is a reciprocating compressor 100, as shown in fig. 3, which includes: motor 101, crankshaft 5, connecting rod 4, piston 2, slider 3, cylinder 1, suction valve 6 and discharge valve 7. After the motor 101 is started, the motor 101 drives the crankshaft 5, the crankshaft 5 drives the connecting rod 4, the connecting rod 4 drives the piston 2, and the piston 2 moves up and down. The volume in the cylinder 1 is changed by the movement of the piston 2, when the piston 2 moves downwards, the volume of the cylinder 1 is increased, the air suction valve 6 is opened, the exhaust valve 7 is closed, air is sucked in, and the air inlet process is completed; when the piston 2 moves upwards, the volume of the cylinder 1 is reduced, the exhaust valve 7 is opened, the suction valve 6 is closed, and the compression process is completed.
It should be noted that, if the rotation speed of the motor 101 is too low, the compressor 100 cannot be started normally, and the compressor 100 greatly shakes when the motor 101 runs at a low speed, so in this embodiment, the target angle for optimal starting is selected by determining the magnitude relationship between the rotation speeds corresponding to the N preset angles and the preset threshold, which not only can ensure that the compressor 100 starts smoothly, but also can reduce the shake of the compressor 100. In this embodiment, the preset threshold may be set according to the minimum rotation speed of the motor 101 in the specification parameters of the compressor 100, and is not limited herein.
The counter electromotive force is an electromotive force generated by a tendency of a change in counter current. When the motor 101 is initially started, the field winding establishes a magnetic field, the armature current generates another magnetic field, the two magnetic fields interact, the motor 101 is started to run, the armature winding rotates in the magnetic field, therefore, a generator effect is generated, and actually, the armature is rotated to generate an induced electromotive force with the polarity opposite to that of the armature voltage, and the self-induced electromotive force is called counter electromotive force. The back electromotive force has consumed the electric energy in the circuit, and when the back electromotive force parameter was too big, power can not satisfy the load normal operating demand, takes place the stalling easily, consequently, in this embodiment, through judging the back electromotive force parameter that a plurality of predetermined angles correspond and the big or small relation between the interval of predetermineeing selects the target angle of optimum start-up, can prevent motor 101 stalling to can guarantee that compressor 100 starts smoothly. In this embodiment, the preset interval may be set according to the locked-rotor determination value of the motor 101, and is not limited herein.
Compared with the prior art, the refrigerator disclosed by the embodiment of the invention has the advantages that in the dragging process of the motor 101 of the compressor 100, detects the back electromotive force parameters and the rotating speed of the motor 101 when the rotor thereof rotates to N preset angles, and according to the magnitude relation between the back electromotive force parameters corresponding to the N preset angles and the preset interval, and the magnitude relation between the rotating speed corresponding to the N preset angles and the preset threshold value, selecting a target angle from the N preset angles, then, the positioning angle of the motor 101 in the positioning stage is corrected to be the target angle, so that the motor 101 can be started at the optimal positioning angle, thereby effectively solving the problem that the compressor 100 is difficult to start or cannot start, and also, achieving the effect of positioning the start with a small current, thereby reducing impulsive noise at start-up and avoiding damage and carbonization of the compressor coil by high current positioning.
As one optional embodiment, the selecting a target angle from the N preset angles according to a magnitude relationship between the back electromotive force parameter corresponding to the N preset angles and a preset interval, and a magnitude relationship between the rotation speed corresponding to the N preset angles and a preset threshold value specifically includes:
and for the characteristic parameters at the N preset angles, if the back electromotive force parameter corresponding to a certain preset angle is in a preset interval and/or the rotating speed corresponding to the preset angle is not lower than a preset threshold, determining that the preset angle is a target angle.
In this embodiment, by selecting a preset angle at which the back electromotive force parameter is within a preset interval and/or the rotation speed is not lower than a preset threshold as an optimal starting target angle, it can be ensured that the back electromotive force parameter and/or the rotation speed meet requirements when the motor 101 is started at the selected positioning angle, thereby achieving optimal starting.
Specifically, the back electromotive force parameter is a ratio of a d-axis back electromotive force to a q-axis back electromotive force of the motor 101;
the preset interval is 20% to 60%.
In this embodiment, the back electromotive force parameter is a ratio of a d-axis back electromotive force to a q-axis back electromotive force of the motor 101, and the preset interval is 20% to 60%, so that the situation that the motor 101 is blocked and cannot be normally started when being started can be prevented.
Further, the back electromotive force parameter corresponding to any preset angle is specifically obtained by the following method:
obtaining stator currents and stator voltages of an alpha axis and a beta axis of the motor 101 when a rotor of the motor rotates to the preset angle;
calculating alpha axis counter electromotive force and beta axis counter electromotive force according to the alpha axis stator current and the beta axis stator voltage, and the pre-acquired stator resistance and stator inductance of the motor 101;
calculating to obtain d-axis counter electromotive force and q-axis counter electromotive force according to the preset angle, the alpha-axis counter electromotive force and the beta-axis counter electromotive force;
and calculating the ratio of the d-axis counter electromotive force to the q-axis counter electromotive force to obtain the counter electromotive force parameter corresponding to the preset angle.
Referring to fig. 4, in the present embodiment, the motor 101 adopts the FOC algorithm, and the specific algorithm process is as follows: three-phase currents Ia, Ib and Ic flowing through the PMSM motor 101 can be obtained through the sampling resistor R, I alpha and I beta are obtained after Clarke conversion, and then Iq and Id are converted through Park conversion. On the other hand, according to the I alpha and the I beta, the actual rotating speed omega is estimated through an estimator, compared with the set rotating speed, the reference Iq and Id currents are output through PI adjustment, the actual Vq and Vd are output through PI adjustment of a current loop, the three-phase bridge is finally output through anti-Clarke and anti-Park transformation and SVM modulation, and the motor 101 is driven. The FOC control algorithm comprises two closed loops, wherein one closed loop is a current closed loop and comprises a Q-axis current loop and a D-axis current loop, the other closed loop is a speed loop, the current is an outer loop, the speed loop is an inner loop, and the two closed loops are realized through PI regulation. The current loop regulation is torque and excitation, and the speed loop regulation is rotation speed.
In this embodiment, by obtaining the stator current and the stator voltage of the α axis and the β axis when the rotor of the motor 101 rotates to a certain preset angle, and combining the stator resistance and the stator inductance of the motor 101 obtained in advance, the α axis counter electromotive force and the β axis counter electromotive force are calculated, and then combining the α axis counter electromotive force, the β axis counter electromotive force and the preset angle, the d axis counter electromotive force and the q axis counter electromotive force corresponding to the preset angle are calculated, so that the counter electromotive force parameter corresponding to the preset angle can be accurately calculated, and the accuracy of the optimal positioning angle is improved.
Specifically, the calculation formula of the α -axis back electromotive force is as follows:
Eα＝Vα–RsIα–LsdIα/dt；
the calculation formula of the beta axis counter electromotive force is as follows:
Eβ＝Vβ–RsIβ–LsdIβ/dt；
the calculation formula of the d-axis back electromotive force is as follows:
Ed＝Eαcos(θesti)+Eβsin(θesti)；
the calculation formula of the q-axis counter electromotive force is as follows:
Eq＝Eβcos(θesti)-Eαsin(θesti)；
wherein E isαIs the alpha axis back electromotive force; eβThe beta axis counter electromotive force respectively; vαIs the alpha axis stator voltage of the electric machine 101; vβIs the beta axis stator voltage of the motor 101; i isαIs the alpha axis stator current of the motor 101; i isβIs the beta axis stator current of the motor 101; r issIs the stator resistance of the motor 101; l issIs the stator inductance of the electrical machine 101; edIs the d-axis back electromotive force; eqIs the q-axis back electromotive force; theta.theta.estiIs the preset angle.
Referring to fig. 5, the following describes an operation flow of the controller 200 of the refrigerator according to the present embodiment in a specific embodiment:
s11, controlling the rotor of the motor 101 to rotate when receiving the start command;
s12, after the rotor is determined to rotate to a positioning angle, controlling the motor 101 to start dragging;
s13, in the dragging process of the motor 101, judging whether the rotor of the motor 101 rotates to one of N preset angles, if so, entering the step S14, and if not, continuing to judge;
s14, acquiring back electromotive force parameters and rotating speed of the motor 101, and entering step S15;
s15, judging that the back electromotive force parameters and the rotating speed corresponding to the N preset angles are obtained, if so, entering a step S16, otherwise, returning to the step S13;
s16, selecting a target angle from the N preset angles according to the size relation between the back electromotive force parameters corresponding to the N preset angles and a preset interval and the size relation between the rotating speed corresponding to the N preset angles and a preset threshold;
and S17, correcting the positioning angle to the target angle.
Fig. 6 is a schematic flowchart of a start optimization method for a motor according to an embodiment of the present invention.
The embodiment of the invention provides a starting optimization method of a motor, which comprises the following steps:
s21, when receiving a starting instruction, controlling the rotor of the motor to rotate;
s22, after the rotor is determined to rotate to a positioning angle, controlling the motor to start dragging;
s23, detecting back electromotive force parameters and rotating speeds of the motor when a rotor of the motor rotates to N preset angles in the dragging process of the motor;
s24, selecting a target angle from the N preset angles according to the size relation between the back electromotive force parameters corresponding to the N preset angles and a preset interval and the size relation between the rotating speed corresponding to the N preset angles and a preset threshold;
and S25, correcting the positioning angle to the target angle.
Compared with the prior art, the starting optimization method of the motor disclosed by the embodiment of the invention has the advantages that the counter electromotive force parameters and the rotating speed of the motor when the rotor of the motor rotates to N preset angles are detected in the dragging process of the motor, the target angle is selected from the N preset angles according to the size relationship between the counter electromotive force parameters corresponding to the N preset angles and the preset interval and the size relationship between the rotating speed corresponding to the N preset angles and the preset threshold value, and then the positioning angle of the motor in the positioning stage is corrected to be the target angle, so that the motor can be started at the optimal positioning angle, and the problem that the compressor is difficult to start or cannot be started is effectively solved.
As an optional embodiment, referring to fig. 7, according to the magnitude relationship between the back electromotive force parameter corresponding to the N preset angles and the preset interval, and the magnitude relationship between the rotation speed corresponding to the N preset angles and the preset threshold, a target angle is selected from the N preset angles, specifically:
and for the characteristic parameters at the N preset angles, if the back electromotive force parameter corresponding to a certain preset angle is in a preset interval and/or the rotating speed corresponding to the preset angle is not lower than a preset threshold, determining that the preset angle is a target angle.
In this embodiment, by selecting a preset angle at which the back electromotive force parameter is within a preset interval and/or the rotation speed is not lower than a preset threshold as an optimal starting target angle, it can be ensured that the back electromotive force parameter and/or the rotation speed meet requirements when the motor is started at the selected positioning angle, thereby achieving optimal starting.
As one of alternative embodiments, the back electromotive force parameter is a ratio of a d-axis back electromotive force to a q-axis back electromotive force of the motor;
the preset interval is 20% to 60%.
In this embodiment, the back electromotive force parameter is a ratio of a d-axis back electromotive force to a q-axis back electromotive force of the motor, and the preset interval is 20% to 60%, so that the situation that the motor cannot be normally started due to stalling during starting can be prevented.
Further, the back electromotive force parameter corresponding to any preset angle is specifically obtained by the following method:
obtaining stator current and stator voltage of an alpha axis and a beta axis of the motor when a rotor of the motor rotates to the preset angle;
calculating alpha axis counter electromotive force and beta axis counter electromotive force according to the alpha axis stator current and the beta axis stator voltage, and the pre-acquired stator resistance and stator inductance of the motor;
calculating to obtain d-axis counter electromotive force and q-axis counter electromotive force according to the preset angle, the alpha-axis counter electromotive force and the beta-axis counter electromotive force;
and calculating the ratio of the d-axis counter electromotive force to the q-axis counter electromotive force to obtain the counter electromotive force parameter corresponding to the preset angle.
In this embodiment, by acquiring stator current and stator voltage of an α axis and a β axis of the motor when the rotor of the motor rotates to a certain preset angle, and combining the stator resistance and the stator inductance of the motor that are acquired in advance, α axis counter electromotive force and β axis counter electromotive force are calculated, and then combining the α axis counter electromotive force, the β axis counter electromotive force and the preset angle, d axis counter electromotive force and q axis counter electromotive force corresponding to the preset angle are calculated, so that counter electromotive force parameters corresponding to the preset angle can be accurately calculated, and accuracy of an optimal positioning angle is improved.
Specifically, the calculation formula of the α -axis back electromotive force is:
Eα＝Vα–RsIα–LsdIα/dt；
the calculation formula of the beta axis counter electromotive force is as follows:
Eβ＝Vβ–RsIβ–LsdIβ/dt；
the calculation formula of the d-axis back electromotive force is as follows:
Ed＝Eαcos(θesti)+Eβsin(θesti)；
the calculation formula of the q-axis counter electromotive force is as follows:
Eq＝Eβcos(θesti)-Eαsin(θesti)；
wherein, EαIs the alpha axis back electromotive force; eβAre respectively asThe beta axis back electromotive force; vαIs the alpha axis stator voltage of the motor; vβIs a beta axis stator voltage of the motor; I.C. AαIs an alpha-axis stator current of the motor; i isβA beta axis stator current for the motor; rsIs a stator resistance of the motor; l issIs a stator inductance of the electric machine; edIs the d-axis back electromotive force; eqIs the q-axis back electromotive force; thetaestiIs the preset angle.
It should be noted that the method for optimizing the starting of the motor provided in this embodiment may be applied to a motor of a compressor of a household appliance such as a refrigerator and an air conditioner, may also be applied to a motor of a household appliance such as a washing machine, and may also be applied to other devices having a motor, which is not limited herein. The specific description of the method for optimizing the starting of the motor provided in this embodiment may refer to the above device embodiment, and is not repeated herein.
Another embodiment of the invention further provides a controller. The controller of this embodiment includes: a processor, a memory and a computer program stored in said memory and executable on said processor, such as the method for start-up optimization of an electric motor in the above-described method embodiments. The processor implements the steps in the above-described embodiments of the method for optimizing starting of each motor when executing the computer program.
Illustratively, the computer program may be partitioned into one or more modules/units that are stored in the memory and executed by the processor to implement the invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program in the controller.
The controller may include, but is not limited to, a processor, a memory. It will be appreciated by those skilled in the art that the schematic diagram is merely an example of a controller and does not constitute a limitation on the controller, and may include more or fewer components than shown, or some components in combination, or different components, e.g., the controller may also include input output devices, network access devices, buses, etc.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, or the like. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like that is the control center for the controller and that connects the various parts of the overall controller using various interfaces and lines.
The memory may be used to store the computer programs and/or modules, and the processor may implement the various functions of the controller by running or executing the computer programs and/or modules stored in the memory, as well as by invoking data stored in the memory. The memory may include high speed random access memory and may also include non-volatile memory such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
Wherein the controller integrated module/unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, can be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer-readable medium may contain suitable additions or subtractions depending on the requirements of legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer-readable media may not include electrical carrier signals or telecommunication signals in accordance with legislation and patent practice.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims (10)

1. A refrigerator, characterized by comprising:
the driving mechanism of the compressor is a motor;
a controller to:
when a starting instruction is received, controlling a rotor of the motor to rotate;
after the rotor is determined to rotate to a positioning angle, controlling the motor to carry out dragging starting;
detecting back electromotive force parameters and rotating speeds of the motor when a rotor of the motor rotates to N preset angles in the dragging process of the motor;
selecting a target angle from the N preset angles according to the size relationship between the back electromotive force parameters corresponding to the N preset angles and a preset interval and the size relationship between the rotating speed corresponding to the N preset angles and a preset threshold;
and correcting the positioning angle to be the target angle.
2. The refrigerator according to claim 1, wherein the target angle is selected from the N preset angles according to a magnitude relationship between the back electromotive force parameter corresponding to the N preset angles and a preset interval, and a magnitude relationship between the rotation speed corresponding to the N preset angles and a preset threshold, specifically:
and for the characteristic parameters at the N preset angles, if the back electromotive force parameter corresponding to a certain preset angle is in a preset interval and/or the rotating speed corresponding to the preset angle is not lower than a preset threshold, determining that the preset angle is a target angle.
3. The refrigerator according to claim 1 or 2, wherein the back electromotive force parameter is a ratio of a d-axis back electromotive force to a q-axis back electromotive force of the motor;
the preset interval is 20% to 60%.
4. The refrigerator according to claim 3, wherein the back electromotive force parameter corresponding to any one of the preset angles is obtained by:
obtaining stator current and stator voltage of an alpha axis and a beta axis of the motor when a rotor of the motor rotates to the preset angle;
calculating alpha axis counter electromotive force and beta axis counter electromotive force according to the alpha axis stator current and the beta axis stator voltage, and the pre-acquired stator resistance and stator inductance of the motor;
according to the preset angle, the alpha axis counter electromotive force and the beta axis counter electromotive force, calculating to obtain d axis counter electromotive force and q axis counter electromotive force;
and calculating the ratio of the d-axis counter electromotive force to the q-axis counter electromotive force to obtain the counter electromotive force parameter corresponding to the preset angle.
5. The refrigerator of claim 4, wherein the α -axis counter electromotive force is calculated by a formula of:
Eα＝Vα–RsIα–LsdIα/dt；
the calculation formula of the beta axis counter electromotive force is as follows:
Eβ＝Vβ–RsIβ–LsdIβ/dt；
the calculation formula of the d-axis back electromotive force is as follows:
Ed＝Eαcos(θesti)+Eβsin(θesti)；
the calculation formula of the q-axis counter electromotive force is as follows:
Eq＝Eβcos(θesti)-Eαsin(θesti)；
wherein E isαIs the alpha axis back electromotive force; eβThe beta axis counter electromotive force respectively; vαIs the alpha axis stator voltage of the motor; vβIs a beta axis stator voltage of the motor; i isαIs an alpha-axis stator current of the motor; i isβIs a beta axis stator current of the motor; rsIs a stator resistance of the motor; l issIs a stator inductance of the electric machine; edIs the d-axis back electromotive force; eqIs the q-axis back electromotive force; thetaestiIs the preset angle.
6. A method of start-up optimization of an electric machine, comprising:
when a starting instruction is received, controlling a rotor of the motor to rotate;
after the rotor is determined to rotate to a positioning angle, controlling the motor to carry out dragging starting;
detecting back electromotive force parameters and rotating speeds of the motor when a rotor of the motor rotates to N preset angles in the dragging process of the motor;
selecting a target angle from the N preset angles according to the size relation between the back electromotive force parameters corresponding to the N preset angles and a preset interval and the size relation between the rotating speed corresponding to the N preset angles and a preset threshold value;
and correcting the positioning angle into the target angle.
7. A starting optimization method of a motor according to claim 6, wherein a target angle is selected from the N preset angles according to a magnitude relation between the back electromotive force parameter corresponding to the N preset angles and a preset interval and a magnitude relation between the rotating speed corresponding to the N preset angles and a preset threshold, specifically:
and for the characteristic parameters at the N preset angles, if the back electromotive force parameter corresponding to a certain preset angle is in a preset interval and/or the rotating speed corresponding to the preset angle is not lower than a preset threshold value, determining that the preset angle is a target angle.
8. A start-up optimization method of an electric motor according to claim 6, wherein the back electromotive force parameter is a ratio of a d-axis back electromotive force to a q-axis back electromotive force of the electric motor;
the preset interval is 20% to 60%.
9. A starting optimization method of a motor according to claim 8, wherein the back electromotive force parameter corresponding to any one of the preset angles is obtained by:
obtaining stator current and stator voltage of an alpha axis and a beta axis of the motor when a rotor of the motor rotates to the preset angle;
calculating alpha axis counter electromotive force and beta axis counter electromotive force according to the alpha axis stator current and the beta axis stator voltage, and the pre-acquired stator resistance and stator inductance of the motor;
calculating to obtain d-axis counter electromotive force and q-axis counter electromotive force according to the preset angle, the alpha-axis counter electromotive force and the beta-axis counter electromotive force;
and calculating the ratio of the d-axis counter electromotive force to the q-axis counter electromotive force to obtain the counter electromotive force parameter corresponding to the preset angle.
10. A start-up optimizing method of a motor according to claim 9, wherein the calculation formula of the α -axis back electromotive force is:
Eα＝Vα–RsIα–LsdIα/dt；
the calculation formula of the beta axis counter electromotive force is as follows:
Eβ＝Vβ–RsIβ–LsdIβ/dt；
the calculation formula of the d-axis back electromotive force is as follows:
Ed＝Eαcos(θesti)+Eβsin(θesti)；
the calculation formula of the q-axis counter electromotive force is as follows:
Eq＝Eβcos(θesti)-Eαsin(θesti)；
wherein E isαIs the alpha axis back electromotive force; eβAre the beta axis back emf, respectively; vαAn alpha axis stator voltage of the motor; vβIs a beta axis stator voltage of the motor; I.C. AαIs an alpha-axis stator current of the motor; i isβIs a beta axis stator current of the motor; rsIs a stator resistance of the motor; l is a radical of an alcoholsIs a stator inductance of the electrical machine; edIs the d-axis back electromotive force; eqIs the q-axis back emf; thetaestiIs the preset angle.
CN202210372182.XA 2022-04-11 2022-04-11 Refrigerator and starting optimization method of motor Pending CN114744943A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115435545A (en) * 2022-09-02 2022-12-06 海信冰箱有限公司 Refrigerator and compressor control method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115435545A (en) * 2022-09-02 2022-12-06 海信冰箱有限公司 Refrigerator and compressor control method thereof

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