CN116388631A - Overheat protection method for variable-frequency refrigerator compressor - Google Patents
Overheat protection method for variable-frequency refrigerator compressor Download PDFInfo
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- CN116388631A CN116388631A CN202310413377.9A CN202310413377A CN116388631A CN 116388631 A CN116388631 A CN 116388631A CN 202310413377 A CN202310413377 A CN 202310413377A CN 116388631 A CN116388631 A CN 116388631A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000004804 winding Methods 0.000 claims abstract description 69
- 230000001360 synchronised effect Effects 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 238000011217 control strategy Methods 0.000 claims abstract description 8
- 238000005516 engineering process Methods 0.000 claims abstract description 6
- 230000004907 flux Effects 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
- 238000011897 real-time detection Methods 0.000 abstract description 3
- 230000001012 protector Effects 0.000 description 14
- 230000008859 change Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000009413 insulation Methods 0.000 description 1
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- 238000013021 overheating Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- 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
- F04B49/10—Other safety measures
-
- 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
- F04B49/20—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 changing the driving speed
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/0805—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for synchronous motors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/0833—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for electric motors with control arrangements
-
- 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
- H02P21/0003—Control strategies in general, e.g. linear type, e.g. P, PI, PID, using robust control
- H02P21/0007—Control strategies in general, e.g. linear type, e.g. P, PI, PID, using robust control using sliding mode control
-
- 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
- H02P21/13—Observer control, e.g. using Luenberger observers or Kalman filters
-
- 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
- H02P21/24—Vector control not involving the use of rotor position or rotor speed sensors
-
- 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
-
- 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
-
- 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
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The invention discloses a variable-frequency refrigeratorA compressor overheat protection method. In the invention, the following components are added: the electric angular speed omega and d-axis current i of the compressor motor are obtained by a sensorless vector frequency conversion control technology of the permanent magnet synchronous motor d And q-axis current i q The method comprises the steps of carrying out a first treatment on the surface of the Detecting phase resistance R of compressor motor through sliding mode observer s The method comprises the steps of carrying out a first treatment on the surface of the Phase resistance R of compressor motor at 20 ℃ is measured s20 Obtaining the phase resistance R of the compressor motor s Is denoted as R st The corresponding compressor motor winding temperature t is obtained through a formula. The invention realizes real-time detection of the temperature of the motor winding of the compressor by utilizing the control algorithm, and adopts different control strategies according to different temperature sections of the winding, thereby effectively ensuring that the motor winding of the compressor is not overheated, prolonging the service life of the compressor and ensuring that the number of times of protection is not limited.
Description
Technical Field
The invention belongs to the technical field of refrigerator control, and particularly relates to a variable-frequency refrigerator compressor overheat protection method.
Background
The highest winding temperature of the motor of the refrigerator compressor is generally 120 ℃ (E-level insulation), the traditional fixed-frequency compressor is generally overheat-protected by adopting an overload protector, namely the overload protector is manufactured according to the bimetallic strip principle and is attached to the surface of the compressor, and a main contact is connected with an input power supply of the compressor in series. When the temperature of the compressor reaches a set value, the bimetallic strip of the overload protector acts, the input power supply of the compressor is disconnected, and overheat protection of the compressor is realized. However, this overheat protection has the following disadvantages: (1) The overload protector is attached to the surface of the compressor, so that the real temperature of the motor winding cannot be accurately and timely reflected; (2) The overload protector has limited on/off times, limited service life and influence on reliability; (3) "overload protector" has a certain cost.
The invention utilizes the sensorless vector frequency conversion control technology and an observer to realize real-time detection of the resistance of the motor winding of the frequency conversion compressor, and obtains the temperature of the winding according to a certain relation between the resistance value of the motor winding and the temperature. Meanwhile, according to the temperature change condition of the winding, the temperature of the winding of the compressor is in a reasonable range through a control strategy, if the temperature of the winding exceeds a design value, variable frequency drive stops outputting, the compressor stops working, and an overheat fault is reported.
Disclosure of Invention
The invention aims to provide a overheat protection method for a variable-frequency refrigerator compressor, which is characterized in that the temperature of a motor winding of the compressor is detected in real time by utilizing a control algorithm, and different control strategies are adopted according to different temperature sections of the winding, so that the motor winding of the compressor can be effectively ensured not to overheat, the service life of the compressor is prolonged, the protection times are not limited, and compared with the traditional overload protector, the accuracy is higher, the time is more prolonged, the influence of external factors is avoided, the service life is limited, and the method is more advantageous.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a overheat protection method for a variable-frequency refrigerator compressor, which comprises the following steps:
stp1, using sensorless vector frequency conversion control technology of permanent magnet synchronous motor to obtain electric angular velocity omega and d-axis current i of compressor motor d And q-axis current i q ；
Stp2, will i d 、i q Omega is brought into a sliding mode observer of the following formula, and the estimated value of q-axis current under the synchronous rotation d/q coordinate system is solved
Finally, calculating to obtain the stator resistance R by the following method s
Wherein, the LPF is a low-pass filter; k (k) R Is a sliding mode coefficient; phi (phi) f Flux linkage generated for the motor permanent magnet; l (L) s Inductance is the inductance of the motor stator winding; omega is the electric angular velocity obtained by a sensorless vector frequency conversion control algorithm of the permanent magnet synchronous motorA degree; u (U) q The q-axis voltage component is obtained through a sensorless vector frequency conversion control algorithm of the permanent magnet synchronous motor; sign () is a sign function;
stp3, calculate the temperature of the motor winding according to the relation formula between resistance and temperature of the motor winding of the compressor, including the following substeps:
SS01, first measuring the phase resistance of the compressor motor at 20 ℃ by the above formula
Obtaining the phase resistance R of the compressor motor at a certain moment s Is denoted as R st ，
SS02, calculating the temperature t of the motor winding of the compressor according to a relation formula between the resistance value and the temperature of the motor winding of the compressor;
the relation formula between the resistance value and the temperature of the motor winding of the compressor is as follows:
R st ＝R s20 [1+α(t-20)]；
stp4, after detecting the temperature of the motor winding of the compressor, adopting different control strategies according to the temperature of the winding:
when the temperature t of the motor winding is below 110 ℃, only uploading the temperature of the motor winding in the area, and not intervening in control;
when the temperature t of the motor winding of the compressor is 110 to t g The variable frequency drive reduces the rotation speed of the compressor at intervals of 300 revolutions, and continuously operates for 2 minutes at each interval point, if the temperature of the winding of the compressor continues to rise, the temperature is reduced by 300 revolutions again, and the variable frequency drive is circulated until the temperature of the winding of the motor of the compressor is not increased any more; when the temperature of the motor winding of the compressor is not increased any more, the variable frequency driver reduces the rotating speed of the compressor at intervals of 100 revolutions and continuously operates for 1 minute at each interval point, and when the temperature of the motor winding is lower than 110 ℃, the intervention control is released;
when the temperature of the motor winding of the compressor is greater than t g When the variable frequency drive stops outputting, the compressor stops working, and the overheat fault of the compressor is reported;
t g is a preset overheat protection point temperature value.
Preferably, in step Stp1, a three-phase input current i is obtained by sampling the compressor input current a 、i b 、i c Coordinate transformation is carried out to obtain d-axis current i d And q-axis current i q The method comprises the steps of carrying out a first treatment on the surface of the And then the electric angular speed omega of the compressor motor is obtained through a sensorless observer.
The invention has the following beneficial effects:
the invention realizes real-time detection of the temperature of the motor winding of the compressor by utilizing the control algorithm, adopts different control strategies according to different temperature sections of the winding, can effectively ensure that the motor winding of the compressor is not overheated, prolongs the service life of the compressor, has no limitation on the number of protection times, has higher precision and more timeliness compared with the traditional overload protector, is not influenced by external factors, has limited service life and has more advantages.
Of course, it is not necessary for any one product to practice the invention to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for overheat protection of a variable frequency refrigerator compressor according to the present invention;
fig. 2 is a sensorless vector frequency conversion control block diagram of a permanent magnet synchronous motor.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the invention discloses a method for protecting overheat of a variable-frequency refrigerator compressor, which comprises the following steps:
stp1, as shown in FIG. 2, obtains three-phase input current i through compressor input current sampling by using sensorless vector frequency conversion control technology of permanent magnet synchronous motor a 、i b 、i c Coordinate transformation is carried out to obtain d-axis current i d And q-axis current i q The method comprises the steps of carrying out a first treatment on the surface of the Obtaining the electric angular velocity omega of the compressor motor through a sensorless observer;
stp2, i will be as shown in FIG. 2 d 、i q Omega is brought into a sliding mode observer of the following formula, and the estimated value of q-axis current under the synchronous rotation d/q coordinate system is solved
Finally, calculating to obtain the stator resistance R by the following method s
Wherein, the LPF is a low-pass filter; k (k) R The sliding mode coefficient is used for determining whether the sliding mode observer is stable or not; phi (phi) f The flux linkage generated by the permanent magnet of the motor is an inherent parameter of the motor; l (L) s The inductance value of the motor stator winding is the inherent parameter of the motor; omega is the electric angular velocity obtained by a sensorless vector frequency conversion control algorithm of the permanent magnet synchronous motor; u (U) q The q-axis voltage component is obtained through a sensorless vector frequency conversion control algorithm of the permanent magnet synchronous motor; sign () is a sign function;
stp3, according to the resistance of the compressor motor winding will change with the change of temperature, there is certain mathematical relation between resistance and temperature, namely: r is R st ＝R s20 [1+α(t-20)]The method comprises the steps of carrying out a first treatment on the surface of the Alpha is a material constant, obtained from the material of the wire, generallyCopper wires or aluminum wires are adopted;
the phase resistance of the compressor motor at 20 ℃ is measured first, and the phase resistance is measured by the above
Obtaining the phase resistance R of the compressor motor at a certain moment s Is denoted as R st Then calculating the temperature t of the motor winding of the compressor at the moment;
stp4, after detecting the temperature of the motor winding of the compressor, adopting different control strategies according to the temperature of the winding:
a safety zone, when the temperature t of the motor winding is below 110 ℃, the zone only uploads the temperature of the motor winding and does not interfere with control;
early warning area, when the temperature t of the motor winding of the compressor is 110-t g ℃，t g The temperature value is a preset overheat protection point temperature value; the variable frequency drive reduces the rotation speed of the compressor at intervals of 300 revolutions, and continuously operates for 2 minutes at each interval point, if the temperature of the winding of the compressor continues to rise, the variable frequency drive is further reduced by 300 revolutions, and the variable frequency drive is circulated until the temperature of the winding of the motor of the compressor is not increased any more; when the temperature of the motor winding of the compressor is not increased any more, the variable frequency driver reduces the rotating speed of the compressor at intervals of 100 revolutions and continuously operates for 1 minute at each interval point, and when the temperature of the motor winding is lower than 110 ℃, the intervention control is released;
a protection area for protecting the motor winding when the temperature of the motor winding of the compressor is greater than t g When the variable frequency drive stops outputting, the compressor stops working, and the overheat fault of the compressor is reported; meanwhile, according to the property of overheat protection, the power-on reset is needed to continue operation. This effectively protects the compressor from overheating.
The existing overload protector is made according to the bimetallic strip principle, the protector is connected in series with a power supply loop, and contacts of the protector are closed during normal operation, so that power supply is normal. If the temperature of the compressor reaches or exceeds the set value, the bimetallic strip of the protector acts to disconnect the input of the mains supply, and the compressor stops working, and the schematic diagram is shown in the figure I. However, the overload protector has low temperature detection precision, and meanwhile, the contacts of the protector need to break relatively large current when being opened/closed, the contacts are easy to burn out, and the service life is limited. The invention utilizes the sensorless vector variable frequency control technology of the permanent magnet synchronous motor and an observer to detect the resistance of the motor winding of the variable frequency compressor in real time, obtains the corresponding winding temperature according to the resistance of the motor winding, simultaneously, ensures the temperature of the winding of the compressor to be in a reasonable range through a control strategy (the motor rotation speed is reduced and increased) according to the temperature change condition of the winding, and immediately stops the operation of the compressor if the overheat protection value is reached. The device has the characteristics of high overheat protection precision, timeliness, long service life and the like.
It should be noted that, in the above system embodiment, each unit included is only divided according to the functional logic, but not limited to the above division, so long as the corresponding function can be implemented; in addition, the specific names of the functional units are also only for distinguishing from each other, and are not used to limit the protection scope of the present invention.
In addition, it will be understood by those skilled in the art that all or part of the steps in implementing the methods of the embodiments described above may be implemented by a program to instruct related hardware, and the corresponding program may be stored in a computer readable storage medium, such as a ROM/RAM, a magnetic disk or an optical disk, etc.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (2)
1. The overheat protection method for the variable-frequency refrigerator compressor is characterized by comprising the following steps of:
stp1, using sensorless vector frequency conversion control technology of permanent magnet synchronous motor to obtain electric angular velocity omega and d-axis current i of compressor motor d And q-axis current i q ；
Stp2, will i d 、i q Omega is brought into a sliding mode observer of the following formula, and the estimated value of q-axis current under the synchronous rotation d/q coordinate system is solved
Finally, calculating to obtain the stator resistance R by the following method s
Wherein, the LPF is a low-pass filter; k (k) R Is a sliding mode coefficient; phi (phi) f Flux linkage generated for the motor permanent magnet; l (L) s Inductance is the inductance of the motor stator winding; omega is the electric angular velocity obtained by a sensorless vector frequency conversion control algorithm of the permanent magnet synchronous motor; u (U) q The q-axis voltage component is obtained through a sensorless vector frequency conversion control algorithm of the permanent magnet synchronous motor; sign () is a sign function;
stp3, calculate the temperature of the motor winding according to the relation formula between resistance and temperature of the motor winding of the compressor, including the following substeps:
SS01, first measuring the phase resistance of the compressor motor at 20 ℃ by the above formula
Obtaining the phase resistance R of the compressor motor at a certain moment s Is denoted as R st ，
SS02, calculating the temperature t of the motor winding of the compressor according to a relation formula between the resistance value and the temperature of the motor winding of the compressor;
the relation formula between the resistance value and the temperature of the motor winding of the compressor is as follows:
R st ＝R s20 [1+α(t-20)]；
stp4, after detecting the temperature of the motor winding of the compressor, adopting different control strategies according to the temperature of the winding:
when the temperature t of the motor winding is below 110 ℃, only uploading the temperature of the motor winding in the area, and not intervening in control;
when the temperature t of the motor winding of the compressor is 110 to t g The variable frequency drive reduces the rotation speed of the compressor at intervals of 300 revolutions, and continuously operates for 2 minutes at each interval point, if the temperature of the winding of the compressor continues to rise, the temperature is reduced by 300 revolutions again, and the variable frequency drive is circulated until the temperature of the winding of the motor of the compressor is not increased any more; when the temperature of the motor winding of the compressor is not increased any more, the variable frequency driver reduces the rotating speed of the compressor at intervals of 100 revolutions and continuously operates for 1 minute at each interval point, and when the temperature of the motor winding is lower than 110 ℃, the intervention control is released;
when the temperature of the motor winding of the compressor is greater than t g When the variable frequency drive stops outputting, the compressor stops working, and the overheat fault of the compressor is reported;
t g is a preset overheat protection point temperature value.
2. The overheat protection method of the variable frequency refrigerator compressor according to claim 1, wherein the step Stp1 obtains a three-phase input current i by sampling the input current of the compressor a 、i b 、i c Coordinate transformation is carried out to obtain d-axis current i d And q-axis current i q The method comprises the steps of carrying out a first treatment on the surface of the And then the electric angular speed omega of the compressor motor is obtained through a sensorless observer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310413377.9A CN116388631A (en) | 2023-04-18 | 2023-04-18 | Overheat protection method for variable-frequency refrigerator compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310413377.9A CN116388631A (en) | 2023-04-18 | 2023-04-18 | Overheat protection method for variable-frequency refrigerator compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116388631A true CN116388631A (en) | 2023-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310413377.9A Pending CN116388631A (en) | 2023-04-18 | 2023-04-18 | Overheat protection method for variable-frequency refrigerator compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116388631A (en) |
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- 2023-04-18 CN CN202310413377.9A patent/CN116388631A/en active Pending
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