CN112611037B - Air conditioner and fault judging method for single-phase motor for air conditioner - Google Patents

Air conditioner and fault judging method for single-phase motor for air conditioner Download PDF

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Publication number
CN112611037B
CN112611037B CN202011455028.6A CN202011455028A CN112611037B CN 112611037 B CN112611037 B CN 112611037B CN 202011455028 A CN202011455028 A CN 202011455028A CN 112611037 B CN112611037 B CN 112611037B
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motor
fault
time
protection
preset
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CN112611037A (en
Inventor
张平
马晓雷
何成军
武景涛
窦秀华
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F24F5/001—Compression cycle type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F24F11/38—Failure diagnosis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/52—Indication arrangements, e.g. displays
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/88—Electrical aspects, e.g. circuits
    • 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

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Human Computer Interaction (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biomedical Technology (AREA)
  • Sustainable Development (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

The application discloses an air conditioner and a fault judging method of a single-phase motor for the air conditioner, wherein the air conditioner comprises a refrigerant circulation loop, a compressor, an outdoor heat exchanger, an indoor heat exchanger and a single-phase motor, wherein a motor thermal protector is arranged for driving a fan to rotate, and a controller is configured to: obtaining a plurality of groups of protection time length, wherein the protection time length is the time for the temperature of the motor thermal protector to rise from the protector recovery temperature to the protector action temperature; acquiring a reset time length, wherein the reset time length is the time taken by the temperature of the motor thermal protector to drop from the action temperature of the protector to the recovery temperature of the protector; and determining the fault of the single-phase motor based on the protection duration and the recovery time, thereby determining the specific fault reason of the single-phase motor for the air conditioner and providing accurate data for fault elimination and fault piece analysis.

Description

Air conditioner and fault judging method for single-phase motor for air conditioner
Technical Field
The application relates to the field of air conditioner control, in particular to an air conditioner and a fault judging method of a single-phase motor for the air conditioner.
Background
In the air conditioning industry, the AC motor is widely applied, in particular to a single-phase capacitor operation asynchronous motor, which is widely applied to an air duct machine and an outdoor air supply system of an air conditioner due to simple structure and stable quality. Such motors typically have a motor thermal protector disposed within the windings of the air conditioner, which is typically bimetallic and is strung into the motor's power circuit. The protector mainly has two parameters of protection temperature and recovery temperature, when the temperature of the winding rises and reaches the protection temperature of the protector, the contacts of the bimetallic strip protector deform to cut off the power supply of the motor, after the motor stops supplying power, the winding can naturally dissipate heat, the temperature can gradually decrease, when the temperature reaches the recovery temperature, the metal contacts are recovered to be conducted, and the motor recovers to supply power.
In the prior art, the switch state of the protector is provided for an air conditioner upper computer in a voltage and pulse detection mode, so that the air conditioner can send an alarm signal when the power supply of the motor is disconnected. But for the alarm signal, a motor fault is simply prompted, and a detailed fault reason is not obtained.
Therefore, how to determine the specific failure cause of the single-phase motor for the air conditioner is a technical problem to be solved at present.
Disclosure of Invention
The application provides an air conditioner, which is used for solving the technical problem that the specific fault cause of a single-phase motor for the air conditioner cannot be determined in the prior art, and comprises the following components:
a refrigerant circulation loop for circulating the refrigerant in a loop formed by the compressor, the condenser, the expansion valve, the evaporator, the four-way valve and the pressure reducer;
the compressor is used for compressing the low-temperature low-pressure refrigerant gas into high-temperature high-pressure refrigerant gas and discharging the high-temperature high-pressure refrigerant gas to the condenser;
an outdoor heat exchanger and an indoor heat exchanger, wherein one of the two heat exchangers works as a condenser and the other works as an evaporator;
the single-phase motor is provided with a motor thermal protector and is used for driving the fan to rotate;
a controller configured to:
obtaining a plurality of groups of protection time length, wherein the protection time length is the time for the temperature of the motor thermal protector to rise from the recovery temperature to the action temperature;
acquiring a reset time length, wherein the reset time length is the time taken by the temperature of the motor thermal protector to drop from the action temperature to the recovery temperature;
determining a fault of the single-phase motor based on the protection duration and the recovery time;
the faults comprise motor locked rotor, motor capacitor open circuit, motor capacitor short circuit, motor turn-to-turn short circuit and motor thermal protector failure.
In some embodiments, the controller is configured to:
when the reset duration is less than or equal to a first preset time, determining that the fault is bad for the motor thermal protector;
when the reset time period is longer than a first preset time period and a plurality of groups of protection time periods are smaller than a second preset time period, determining that the fault is the turn-to-turn short circuit of the motor;
the protection duration after the acquisition time in the plurality of groups of protection durations is smaller than the protection duration before the acquisition time.
In some embodiments, the controller is configured to:
when the reset time length is longer than the first preset time and a plurality of groups of protection time lengths are in a third preset time range, determining that the fault is the motor locked-rotor;
when the reset time is longer than the first preset time and a plurality of groups of protection time are in a fourth preset time range, determining that the fault is an open circuit of the motor capacitor;
and when the reset time is longer than the first preset time and a plurality of groups of protection time are in a fifth preset time range, determining that the fault is the short circuit of the motor capacitor.
In some embodiments, the controller is configured to:
when the fault is not the poor motor thermal protector and the turn-to-turn short circuit of the motor, generating a fault curve graph based on a plurality of groups of protection duration and reset duration;
and determining the fault of the single-phase motor based on the fault curve graph and a preset fault curve graph, wherein the preset fault curve graph comprises a preset motor locked rotor curve graph, a preset motor capacitance open circuit curve graph and a preset motor capacitance short circuit curve graph.
In some embodiments, the air conditioner further comprises a display module, the controller configured to:
and displaying the fault result in the display module.
Correspondingly, the application also provides a fault judging method of the single-phase motor for the air conditioner, which is applied to the air conditioner comprising a refrigerant circulation loop, a compressor, an outdoor heat exchanger, an indoor heat exchanger, the single-phase motor and a controller, and comprises the following steps:
obtaining a plurality of groups of protection time length, wherein the protection time length is the time for the temperature of the motor thermal protector to rise from the recovery temperature to the action temperature;
acquiring a reset time length, wherein the reset time length is the time taken by the temperature of the motor thermal protector to drop from the action temperature to the recovery temperature;
and determining faults of the single-phase motor based on the protection duration and the recovery time, wherein the faults comprise motor stalling, motor capacitor open circuit, motor capacitor short circuit, motor turn-to-turn short circuit and motor thermal protector failure.
In some embodiments, the fault of the single-phase motor is determined based on the protection duration and the recovery time, specifically:
when the reset duration is less than or equal to a first preset time, determining that the fault is bad for the motor thermal protector;
when the reset time period is longer than a first preset time period and a plurality of groups of protection time periods are smaller than a second preset time period, determining that the fault is the turn-to-turn short circuit of the motor;
the protection duration after the acquisition time in the plurality of groups of protection durations is smaller than the protection duration before the acquisition time.
In some embodiments, the fault of the single-phase motor is determined based on the protection duration and the recovery time, specifically:
when the reset time length is longer than the first preset time and the obtained multiple groups of protection time lengths are all in a third preset time range, determining that the fault is the motor locked-rotor;
when the reset time is longer than the first preset time and the obtained multiple groups of protection time are in a fourth preset time range, determining that the fault is an open circuit of the motor capacitor;
and when the reset time is longer than the first preset time and the obtained multiple groups of protection time are in a fifth preset time range, determining that the fault is the short circuit of the motor capacitor.
In some embodiments, the fault of the single-phase motor is determined based on the protection duration and the recovery time, specifically:
when the fault is not the poor motor thermal protector and the turn-to-turn short circuit of the motor, generating a fault curve graph based on a plurality of groups of protection duration and reset duration;
and determining the fault of the single-phase motor based on the fault curve graph and a preset fault curve graph, wherein the preset fault curve graph comprises a preset motor locked rotor curve graph, a preset motor capacitance open circuit curve graph and a preset motor capacitance short circuit curve graph.
In some embodiments, the air conditioner further comprises a display module, and after determining the failure of the single-phase motor based on the protection duration and the recovery time, the method further comprises:
and displaying the fault result in a display module.
Compared with the prior art, the application has the following beneficial effects:
the application discloses an air conditioner and a fault judging method of a single-phase motor for the air conditioner, wherein the air conditioner comprises a refrigerant circulation loop, a compressor, an outdoor heat exchanger, an indoor heat exchanger and a single-phase motor, wherein a motor thermal protector is arranged for driving a fan to rotate, and a controller is configured to: obtaining a plurality of groups of protection time length, wherein the protection time length is the time for the temperature of the motor thermal protector to rise from the protector recovery temperature to the protector action temperature; acquiring a reset time length, wherein the reset time length is the time taken by the temperature of the motor thermal protector to drop from the action temperature of the protector to the recovery temperature of the protector; and determining the fault of the single-phase motor based on the protection duration and the recovery time, thereby determining the specific fault reason of the single-phase motor for the air conditioner and providing accurate data for fault elimination and fault piece analysis.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, 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 diagram of a motor according to an embodiment of the present application;
FIG. 2 is a fault plot of a single phase motor according to an embodiment of the present application;
fig. 3 is a flow chart of a fault judging method for a single-phase motor for an air conditioner according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application 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 application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
The air conditioner of the present application performs a refrigerating cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies a refrigerant to the air that has been conditioned and heat exchanged.
The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator may achieve a cooling effect by exchanging heat with a material to be cooled using latent heat of evaporation of a refrigerant. Throughout the cycle, the air conditioner may adjust the temperature of the indoor space.
An outdoor unit of an air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, an indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.
The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater of a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler of a cooling mode.
As shown in fig. 1, in general, a single-phase motor for an air conditioner has a low wind level, a medium wind level, a high wind level, and the like, and when the single-phase motor is in a high-level operation, a rated voltage E is applied between the high wind level and a common terminal, and at this time, the voltage across a thermal protector of the motor is 0V, that is, the voltage measured by the voltage detection module in fig. 1 is 0V. Setting the temperature of the single-phase motor to be T0 during normal operation, setting the action temperature of the motor thermal protector to be T1, setting the recovery temperature of the motor thermal protector to be T2, and when the motor abnormally heats, allowing a period of time T to pass 1 The winding temperature is greater than T1, the motor thermal protector is disconnected, the motor is powered off, and the voltage at the two ends of the protector is rated voltage E. Then a period of time t 2 The temperature of the motor winding is reduced to T2, the motor thermal protector is recovered to be conducted, the voltage at the two ends is 0V, and the process is a cyclic reciprocating process.
To further describe the solution of the present application, in one example of the present application, the air conditioner includes:
a refrigerant circulation loop for circulating the refrigerant in a loop formed by the compressor, the condenser, the expansion valve, the evaporator, the four-way valve and the pressure reducer;
the compressor is used for compressing the low-temperature low-pressure refrigerant gas into high-temperature high-pressure refrigerant gas and discharging the high-temperature high-pressure refrigerant gas to the condenser;
an outdoor heat exchanger and an indoor heat exchanger, wherein one of the two heat exchangers works as a condenser and the other works as an evaporator;
the single-phase motor is provided with a motor thermal protector and is used for driving the fan to rotate;
a controller configured to:
obtaining a plurality of groups of protection time length, wherein the protection time length is the time for the temperature of the motor thermal protector to rise from the recovery temperature to the action temperature;
acquiring a reset time length, wherein the reset time length is the time taken by the temperature of the motor thermal protector to drop from the action temperature to the recovery temperature;
determining a fault of the single-phase motor based on the protection duration and the recovery time;
the faults comprise motor locked rotor, motor capacitor open circuit, motor capacitor short circuit, motor turn-to-turn short circuit and motor thermal protector failure.
In the embodiment of the application, the single-phase motor is provided with the motor thermal protector for driving the fan to rotate, the motor thermal protector is disconnected when the temperature of the single-phase motor is higher than the action temperature of the motor thermal protector, and the conduction is recovered when the temperature of the single-phase motor is reduced to the recovery temperature of the motor thermal protector. The controller obtains a plurality of groups of protection time length, the specific group number can be set according to actual conditions, the protection time length is the time for the temperature of the motor thermal protector to rise from the recovery temperature of the motor thermal protector to the action temperature of the motor thermal protector, and since the protector is disconnected, the single-phase motor can be powered off, the temperature of the single-phase motor can be gradually reduced, and after the temperature is reduced to the recovery temperature, the single-phase motor can be powered on again, and if the single-phase motor fault still exists, the temperature of the single-phase motor can be increased, namely the process of rising from the recovery temperature to the action temperature is repeated. The process of obtaining the reset time period is similar to the process of obtaining the protection time period, and the reset time period is the time for the temperature of the motor thermal protector to drop from the action temperature to the recovery temperature. After the reset time and the protection time are obtained, determining faults of the single-phase motor according to the protection time and the reset time, wherein the faults comprise motor locked rotor, motor capacitor open circuit, motor capacitor short circuit, motor turn-to-turn short circuit and motor heat protector failure.
To accurately determine the cause of failure of the single phase motor, in some embodiments, the controller is configured to:
when the reset duration is less than or equal to a first preset time, determining that the fault is bad for the motor thermal protector;
when the reset time period is longer than a first preset time period and a plurality of groups of protection time periods are smaller than a second preset time period, determining that the fault is the turn-to-turn short circuit of the motor;
the protection duration after the acquisition time in the plurality of groups of protection durations is smaller than the protection duration before the acquisition time.
In this embodiment, the fault cause of the single-phase motor is determined by the reset duration and the first preset time, and when the reset duration is less than or equal to the first preset time, the fault is determined to be bad for the motor thermal protector. In general, when the motor fails, the reset time is approximately the same, i.e. the cooling time of the single-phase motor is approximately the same; however, when the motor thermal protector is poor, the motor temperature protector can drift in temperature, and protection is realized under the condition that the motor is not abnormal; in this case, the reset time of the motor thermal protector is generally short, and is greatly different from the normal reset time. When the reset time is longer than the first preset time, the fault cause of the single-phase motor needs to be further judged according to the protection time, and then if the acquired multiple groups of protection time are smaller than the second preset time and the protection time after the acquisition time in the protection time is smaller than the protection time before the acquisition time, the fault is determined to be the turn-to-turn short circuit of the motor. The motor inter-turn short circuit belongs to the quality problem of the motor, the inter-turn short circuit is a progressive type defect, the initial inter-turn defect is slight, the heat productivity of the motor is low, the motor can continuously generate heat at the moment, the heat protection is protected after a period of time, but the inter-turn short circuit is gradually deteriorated along with the inter-turn problem, the inter-turn short circuit is shorter and shorter, and the recovery time is basically kept unchanged. And when the protection time is detected to be gradually shortened and the protection time is smaller than the second preset time, judging that the motor is in turn-to-turn short circuit.
It should be noted that the solution of the above preferred embodiment is only one specific implementation solution provided by the present application, and other methods for determining the fault of the single-phase motor based on the protection duration and the recovery time are all within the protection scope of the present application.
To accurately determine the cause of failure of the single phase motor, in some embodiments, the controller is configured to:
when the reset time length is longer than the first preset time and a plurality of groups of protection time lengths are in a third preset time range, determining that the fault is the motor locked-rotor;
when the reset time is longer than the first preset time and a plurality of groups of protection time are in a fourth preset time range, determining that the fault is an open circuit of the motor capacitor;
and when the reset time is longer than the first preset time and a plurality of groups of protection time are in a fifth preset time range, determining that the fault is the short circuit of the motor capacitor.
In this embodiment, when the fault is a motor stall, a motor capacitor is open, and a motor capacitor is short, the reset time is longer than a first preset time, and the protection time obtained each time is relatively more regular, so after the reset time is determined to be longer than the first preset time, when a plurality of groups of protection time are all in a third preset time range, determining that the fault is the motor stall; when the protection time periods are all in a fourth preset time range, determining that the fault is the open circuit of the motor capacitor; and when the protection time periods are all in a fifth preset time range, determining that the fault is the short circuit of the motor capacitor. The third preset time range, the fourth preset time range, and the fifth preset time range may be determined experimentally. Optionally, the protection duration in the three states is tested respectively, n (n is less than or equal to 10) times is recorded, and then the third preset time range, the fourth preset time range and the fifth preset time range are determined according to the test result.
It should be noted that, in this embodiment, the faults of the single-phase motor are determined by multiple sets of protection times, so that erroneous judgment can be avoided when the faults are judged by only one set of data, and those skilled in the art can determine the faults of the single-phase motor by only one set of protection times as required, which belong to the protection scope of the present application.
To further accurately determine the cause of failure of the single phase motor, in some embodiments, the controller is configured to:
when the fault is not the poor motor thermal protector and the turn-to-turn short circuit of the motor, generating a fault curve graph based on a plurality of groups of protection duration and reset duration;
and determining the fault of the single-phase motor based on the fault curve graph and a preset fault curve graph, wherein the preset fault curve graph comprises a preset motor locked rotor curve graph, a preset motor capacitance open circuit curve graph and a preset motor capacitance short circuit curve graph.
In this embodiment, since the protection time and the reset time are both regular when the single-phase motor fault is a motor locked rotor, a motor capacitor is open, and a motor capacitor is short, after the motor thermal protector is not good and the motor is short-circuited between turns, a fault curve graph can be generated according to multiple groups of the protection time periods and the reset time periods, and then the fault of the single-phase motor is determined by matching the fault curve graph with a preset fault curve graph, where the preset fault curve graph includes a preset motor locked rotor curve graph, a preset motor capacitor open curve graph, and a preset motor capacitor short curve graph. The predetermined fault profile may be determined from experimental data.
To timely feed back single-phase motor faults to a user, in some embodiments, the air conditioner further comprises a display module, the controller configured to:
and displaying the fault result in the display module.
In this example, the display module is configured to display a fault result, and optionally, the fault result may represent different fault results through a preset fault code, or may directly display characters of a fault cause, which all belong to the protection scope of the present application.
The application discloses an air conditioner and a fault judging method of a single-phase motor for the air conditioner, wherein the air conditioner comprises a refrigerant circulation loop, a compressor, an outdoor heat exchanger, an indoor heat exchanger and a single-phase motor, wherein a motor thermal protector is arranged for driving a fan to rotate, and a controller is configured to: obtaining a plurality of groups of protection time length, wherein the protection time length is the time for the temperature of the motor thermal protector to rise from the recovery temperature to the action temperature; acquiring a reset time length, wherein the reset time length is the time taken by the temperature of the motor thermal protector to drop from the action temperature to the recovery temperature; and determining the fault of the single-phase motor based on the protection duration and the recovery time, so as to accurately judge the heating fault of the single-phase motor, refine the fault reason and provide accurate data for fault elimination and fault piece analysis.
In order to further explain the technical idea of the present application, the present application also provides a method for judging faults of a single-phase motor for an air conditioner, the method is applied to the air conditioner including a refrigerant circulation loop, a compressor, an outdoor heat exchanger, an indoor heat exchanger, the single-phase motor and a controller, as shown in fig. 3, the specific steps of the method are as follows:
s301, acquiring a plurality of groups of protection time periods, wherein the protection time periods are the time for the temperature of the motor thermal protector to rise from the recovery temperature to the action temperature.
In this step, since the motor thermal protector is disconnected, the single-phase motor will be powered off, the temperature of the single-phase motor will gradually decrease at this time, and after the temperature is reduced to the recovery temperature, the single-phase motor will be powered on again, at this time, if the single-phase motor failure still exists, the temperature of the single-phase motor will also rise, i.e. the process of rising from the recovery temperature to the protector operating temperature is repeated. Therefore, multiple groups of protection duration can be obtained by multiple times of acquisition of the protection duration, and the protection duration is the time for the temperature of the motor thermal protector to rise from the recovery temperature to the action temperature.
S302, acquiring a reset time, wherein the reset time is the time taken by the temperature of the motor thermal protector to drop from the action temperature to the recovery temperature.
In this step, the process of obtaining the reset duration is similar to the process of obtaining the reset duration, and the reset duration is not described herein again, and is the time taken for the temperature of the motor thermal protector to decrease from the action temperature of the motor thermal protector to the recovery temperature of the motor thermal protector.
S303, determining faults of the single-phase motor based on the protection duration and the recovery time, wherein the faults comprise motor locked rotor, motor capacitor open circuit, motor capacitor short circuit, motor turn-to-turn short circuit and motor thermal protector failure.
In the step, after the reset time and the protection time are obtained, determining the faults of the single-phase motor according to the protection time and the reset time, wherein the faults comprise motor locked rotor, motor capacitor open circuit, motor capacitor short circuit, motor turn-to-turn short circuit and motor thermal protector failure.
In order to accurately determine the cause of the failure of the single-phase motor, in some embodiments, the failure of the single-phase motor is determined based on the protection duration and the recovery time, specifically:
when the reset duration is less than or equal to a first preset time, determining that the fault is bad for the motor thermal protector;
when the reset time period is longer than a first preset time period and a plurality of groups of protection time periods are smaller than a second preset time period, determining that the fault is the turn-to-turn short circuit of the motor;
the protection duration after the acquisition time in the plurality of groups of protection durations is smaller than the protection duration before the acquisition time.
Specifically, when the fault of the single-phase motor is determined according to the protection duration and the recovery time, the fault reason of the single-phase motor is judged through the reset duration and the first preset time, and when the reset duration is smaller than or equal to the first preset time, the fault is determined to be bad of the motor thermal protector. The first preset time can be determined according to experiments, and when the motor fails, the reset time is approximately the same, namely the cooling time of the single-phase motor is approximately the same; however, when the motor thermal protector is poor, the motor temperature protector can drift in temperature, and protection is realized under the condition that the motor is not abnormal; in this case, the reset time of the motor thermal protector is generally short, and is greatly different from the normal reset time. When the reset time is longer than the first preset time, the fault cause of the single-phase motor needs to be further judged according to the protection time, and then if the acquired multiple groups of protection time are smaller than the second preset time and the protection time after the acquisition time in the protection time is smaller than the protection time before the acquisition time, the fault is determined to be the turn-to-turn short circuit of the motor. The second preset threshold may be obtained experimentally.
It should be noted that the solution of the above preferred embodiment is only one specific implementation solution provided by the present application, and other methods for determining the fault of the single-phase motor based on the protection duration and the recovery time are all within the protection scope of the present application.
In order to accurately determine the cause of the failure of the single-phase motor, in some embodiments, the failure of the single-phase motor is determined based on the protection duration and the recovery time, specifically:
when the reset time length is longer than the first preset time and a plurality of groups of protection time lengths are in a third preset time range, determining that the fault is the motor locked-rotor;
when the reset time is longer than the first preset time and a plurality of groups of protection time are in a fourth preset time range, determining that the fault is an open circuit of the motor capacitor;
and when the reset time is longer than the first preset time and a plurality of groups of protection time are in a fifth preset time range, determining that the fault is the short circuit of the motor capacitor.
Specifically, when the faults are motor locked rotor, motor capacitor open circuit and motor capacitor short circuit, the reset time is longer than a first preset time, and the protection time obtained each time is relatively more regular, so that after the reset time is longer than the first preset time, when a plurality of groups of protection time are in a third preset time range, the faults are determined to be motor locked rotor; when the protection time periods are all in a fourth preset time range, determining that the fault is the open circuit of the motor capacitor; and when the protection time periods are all in a fifth preset time range, determining that the fault is the short circuit of the motor capacitor. The third preset time range, the fourth preset time range, and the fifth preset time range may be determined experimentally.
It should be noted that the solution of the above preferred embodiment is only one specific implementation solution provided by the present application, and other methods for determining the fault of the single-phase motor according to the protection duration and the recovery time belong to the protection scope of the present application.
To further accurately determine the cause of the failure of the single-phase motor, in some embodiments, the failure of the single-phase motor is determined based on the protection duration and the recovery time, specifically:
when the fault is not the poor motor thermal protector and the turn-to-turn short circuit of the motor, generating a fault curve graph based on a plurality of groups of protection duration and reset duration;
and determining the fault of the single-phase motor based on the fault curve graph and a preset fault curve graph, wherein the preset fault curve graph comprises a preset motor locked rotor curve graph, a preset motor capacitance open circuit curve graph and a preset motor capacitance short circuit curve graph.
Specifically, when the single-phase motor faults are motor stalling, motor capacitor open circuit and motor capacitor short circuit, the protection time and the reset time are regular, so after the motor thermal protector failure and the motor turn-to-turn short circuit are eliminated, a fault curve graph can be generated according to a plurality of groups of protection time periods and a plurality of groups of reset time periods, and then the fault curve graph is matched with a preset fault curve graph to determine the faults of the single-phase motor. As shown in fig. 2, curve 1 is a fault curve of motor locked rotor, curve 2 is a fault curve of motor capacitor open circuit, curve 3 is a fault curve of motor capacitor short circuit, it can be seen from the graph that each curve of curves 1, 2 and 3 has the same time (i.e. protection time) from T2 to T1 each time, curve 4 is a fault curve of motor turn-to-turn short circuit, and the time from T2 to T1 each time of curve 4 is different, but the values gradually decrease.
It should be noted that the solution of the above preferred embodiment is only one specific implementation solution provided by the present application, and other methods for determining the fault of the single-phase motor according to the protection duration and the recovery time belong to the protection scope of the present application.
In order to timely feed back a single-phase motor failure to a user, in some embodiments, the air conditioner further includes a display module, and after determining the failure of the single-phase motor based on the protection duration and the recovery time, the method further includes:
and displaying the fault result in a display module.
Specifically, after determining the fault of the single-phase motor, the fault is displayed in a display module so as to be checked by a user in time.
It should be noted that, the solution of the above preferred embodiment is only one specific implementation solution proposed by the present application, and other methods for feeding back the fault result to the user belong to the protection scope of the present application.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be appreciated by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not drive the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims (8)

1. An air conditioner, comprising:
a refrigerant circulation loop for circulating the refrigerant in a loop formed by the compressor, the condenser, the expansion valve, the evaporator, the four-way valve and the pressure reducer;
the compressor is used for compressing the low-temperature low-pressure refrigerant gas into high-temperature high-pressure refrigerant gas and discharging the high-temperature high-pressure refrigerant gas to the condenser;
an outdoor heat exchanger and an indoor heat exchanger, wherein one of the two heat exchangers works as a condenser and the other works as an evaporator;
the single-phase motor is provided with a motor thermal protector and is used for driving the fan to rotate;
a controller configured to:
obtaining a plurality of groups of protection time length, wherein the protection time length is the time for the temperature of the motor thermal protector to rise from the recovery temperature to the action temperature;
acquiring a reset time length, wherein the reset time length is the time taken by the temperature of the motor thermal protector to drop from the action temperature to the recovery temperature;
determining a fault of the single-phase motor based on the protection duration and the reset duration;
wherein the faults comprise motor locked rotor, motor capacitor open circuit, motor capacitor short circuit, motor turn-to-turn short circuit and motor thermal protector failure;
wherein the controller is configured to:
when the reset duration is less than or equal to a first preset time, determining that the fault is bad for the motor thermal protector;
when the reset time period is longer than a first preset time period and a plurality of groups of protection time periods are smaller than a second preset time period, determining that the fault is the turn-to-turn short circuit of the motor;
the protection duration after the acquisition time in the plurality of groups of protection durations is smaller than the protection duration before the acquisition time.
2. The air conditioner of claim 1, wherein the controller is configured to:
when the reset time length is longer than the first preset time and a plurality of groups of protection time lengths are in a third preset time range, determining that the fault is the motor locked-rotor;
when the reset time is longer than the first preset time and a plurality of groups of protection time are in a fourth preset time range, determining that the fault is an open circuit of the motor capacitor;
and when the reset time is longer than the first preset time and a plurality of groups of protection time are in a fifth preset time range, determining that the fault is the short circuit of the motor capacitor.
3. The air conditioner of claim 1, wherein the controller is configured to:
when the fault is not the poor motor thermal protector and the turn-to-turn short circuit of the motor, generating a fault curve graph based on a plurality of groups of protection duration and reset duration;
and determining the fault of the single-phase motor based on the fault curve graph and a preset fault curve graph, wherein the preset fault curve graph comprises a preset motor locked rotor curve graph, a preset motor capacitance open circuit curve graph and a preset motor capacitance short circuit curve graph.
4. The air conditioner of claim 1, further comprising a display module, the controller configured to:
and displaying the fault result in the display module.
5. A method for judging faults of a single-phase motor for an air conditioner, which is applied to the air conditioner comprising a refrigerant circulation loop, a compressor, an outdoor heat exchanger, an indoor heat exchanger, the single-phase motor and a controller, the method comprising:
obtaining a plurality of groups of protection time length, wherein the protection time length is the time for the temperature of the motor thermal protector to rise from the recovery temperature to the action temperature;
acquiring a reset time length, wherein the reset time length is the time taken by the temperature of the motor thermal protector to drop from the action temperature to the recovery temperature;
determining faults of the single-phase motor based on the protection duration and the reset duration, wherein the faults comprise motor locked rotor, motor capacitor open circuit, motor capacitor short circuit, motor turn-to-turn short circuit and motor thermal protector failure;
the fault of the single-phase motor is determined based on the protection duration and the reset duration, specifically:
when the reset duration is less than or equal to a first preset time, determining that the fault is bad for the motor thermal protector;
when the reset time period is longer than a first preset time period and a plurality of groups of protection time periods are smaller than a second preset time period, determining that the fault is the turn-to-turn short circuit of the motor;
the protection time length after the acquisition time in the plurality of groups of protection time lengths is smaller than the protection time length before the acquisition time;
wherein, single-phase motor is provided with motor thermal protector for drive fan rotation.
6. The method of claim 5, wherein determining the fault of the single-phase motor based on the protection duration and the reset duration is specifically:
when the reset time length is longer than the first preset time and the obtained multiple groups of protection time lengths are all in a third preset time range, determining that the fault is the motor locked-rotor;
when the reset time is longer than the first preset time and the obtained multiple groups of protection time are in a fourth preset time range, determining that the fault is an open circuit of the motor capacitor;
and when the reset time is longer than the first preset time and the obtained multiple groups of protection time are in a fifth preset time range, determining that the fault is the short circuit of the motor capacitor.
7. The method of claim 5, wherein determining the fault of the single-phase motor based on the protection duration and the reset duration is specifically:
when the fault is not the poor motor thermal protector and the turn-to-turn short circuit of the motor, generating a fault curve graph based on a plurality of groups of protection duration and reset duration;
and determining the fault of the single-phase motor based on the fault curve graph and a preset fault curve graph, wherein the preset fault curve graph comprises a preset motor locked rotor curve graph, a preset motor capacitance open circuit curve graph and a preset motor capacitance short circuit curve graph.
8. The method of claim 5, wherein the air conditioner further comprises a display module, the method further comprising, after determining a failure of the single phase motor based on the protection duration and the reset duration:
and displaying the fault result in a display module.
CN202011455028.6A 2020-12-10 2020-12-10 Air conditioner and fault judging method for single-phase motor for air conditioner Active CN112611037B (en)

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