Air conditioner

Abstract

The invention discloses an air conditioner, and belongs to the technical field of air conditioners. The air conditioner comprises an indoor unit. The outdoor unit comprises an outdoor unit shell, an outdoor heat exchanger, an outdoor fan, an outdoor driving motor, a motor temperature sensor, an outdoor temperature sensor and a controller. A containing cavity is formed in the outdoor unit shell, and the outdoor unit shell is provided with an outdoor air inlet and an outdoor air outlet which communicate with the containing cavity. The outdoor heat exchanger and the outdoor fan are respectively arranged in the accommodating cavity; the outdoor driving motor is used for driving the outdoor fan to operate; the motor temperature sensor is used for detecting the temperature of the outdoor driving motor; the outdoor temperature sensor is used for detecting the outdoor environment temperature; the controller is connected with the outdoor driving motor, the motor temperature sensor and the outdoor temperature sensor. The outdoor controller is configured to control the outdoor driving motor to work; and whether the outdoor driving motor breaks down or not and the fault type are judged according to temperature information detected by the outdoor temperature sensor and temperature information detected by the motor temperature sensor.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioning, and in particular to an air conditioner. Background Art

[0002] The air conditioner includes an indoor unit and an outdoor unit. The indoor unit and the outdoor unit are respectively provided with a heat exchanger. The heat exchanger of the indoor unit is connected to the heat exchanger of the outdoor unit through a pipeline. Refrigerant flows in the pipeline and condenses and flows between the indoor unit and the outdoor unit to achieve cooling or heating of the indoor environment.

[0003] At present, the heat exchanger is arranged in the casing of the indoor unit or the casing of the outdoor unit, which makes it inconvenient for the air to contact the heat exchanger. Therefore, the indoor unit and the outdoor unit are respectively provided with fans corresponding to the heat exchanger. The air is introduced into the casing through the operation of the fan, thereby increasing the heat exchange effect between the air and the heat exchanger. If the outdoor drive motor driving the fan is damaged, the fan cannot work, and the air conditioner cannot achieve cooling or heating. Since the outdoor unit is placed outdoors, on the one hand, the outdoor environment is harsh, which aggravates the damage of the outdoor drive motor. On the other hand, it is inconvenient to repair and inspect the outdoor drive motor, resulting in the failure of the outdoor drive motor cannot be discovered in time.

[0004] In traditional air conditioners, most outdoor drive motors use open-loop control and have no fault detection means. They usually rely on the motor's internal recoverable thermostat for self-protection. At present, although some outdoor drive motors have Hall sensors placed inside or outside the motor to determine the motor's operating status by detecting the motor rotor or wind wheel speed, this method can only determine whether the motor is running. The fault types of outdoor drive motors usually include open circuit faults, stall faults, and overload faults, and the outdoor drive motor will still run when it is overloaded. Therefore, this method cannot identify whether the motor is overloaded, nor can it distinguish whether the outdoor drive motor is open circuit fault or stall fault, which brings great inconvenience to the fault repair of the outdoor drive motor.

[0005] In view of this, this application is filed. Summary of the invention

[0006] In view of the deficiencies existing in the related art, the present application provides an air conditioner to promptly determine whether an outdoor drive motor has a fault and the type of fault.

[0007] The present application provides an air conditioner, including an outdoor unit, the outdoor unit including:

[0008] An outdoor casing has an accommodating cavity formed therein, and is provided with an outdoor air inlet and an outdoor air outlet communicated with the accommodating cavity;

[0009] An outdoor heat exchanger is disposed in the accommodating cavity and close to an outdoor air inlet;

[0010] An outdoor fan is arranged in the accommodating cavity and is located on a side of the outdoor heat exchanger away from the outdoor air inlet;

[0011] The outdoor drive motor is used to drive the outdoor fan. The fault types of the outdoor drive motor include open circuit fault, stall fault and overload fault.

[0012] A first motor temperature sensor, which is installed on the outdoor drive motor and is used to detect the temperature of the outdoor drive motor;

[0013] Outdoor temperature sensor, used to detect outdoor ambient temperature;

[0014] A controller is connected to the outdoor drive motor, the first motor temperature sensor and the outdoor temperature sensor respectively; the outdoor controller is configured as follows:

[0015] Control the operation of the outdoor drive motor;

[0016] Whether the outdoor drive motor has a fault and the type of the fault are determined based on the temperature information detected by the outdoor temperature sensor and the temperature information detected by the first motor temperature sensor.

[0017] This technical solution detects the temperature of the outdoor drive motor by setting a motor temperature sensor. The outdoor temperature sensor is set to detect the outdoor ambient temperature. The relationship between the outdoor drive motor temperature and the outdoor ambient temperature is used to determine whether the outdoor drive motor fails and the type of failure of the outdoor drive motor. The judgment method is simple, reliable, and the judgment result is accurate.

[0018] In some embodiments, the controller is further configured to: at a first moment after the outdoor drive motor is started, obtain the temperature of the outdoor drive motor and the outdoor ambient temperature and calculate the difference between the two as a first difference;

[0019] At a second moment after the outdoor drive motor is started, obtaining the temperature of the outdoor drive motor and the outdoor ambient temperature and calculating the difference between the two as a second difference;

[0020] If the first difference and the second difference are both less than or equal to the first reference value, it is determined that an open circuit fault occurs in the outdoor drive motor.

[0021] This technical solution determines whether an open circuit fault occurs in the outdoor drive motor by comparing the temperature of the outdoor drive motor with the outdoor ambient temperature.

[0022] In some embodiments, a thermostat is installed inside the outdoor drive motor. When the temperature of the outdoor drive motor rises to a certain value, the thermostat is disconnected to prevent current from flowing into the outdoor drive motor.

[0023] In some embodiments, a first threshold and a second threshold are preset in the controller;

[0024] The controller is further configured to: when the outdoor drive motor runs for a first threshold time, compare the difference between the outdoor drive motor temperature and the outdoor ambient temperature with a second threshold; if the absolute value of the difference between the two is less than or equal to a second reference value, further determine the change value of the outdoor drive motor temperature within a certain time interval; if the change value of the outdoor drive motor temperature within a certain time interval is greater than or equal to a third reference value, determine that the outdoor drive motor has a stall fault.

[0025] This technical solution compares the difference between the outdoor drive motor temperature and the outdoor ambient temperature with a second threshold value after the outdoor drive motor runs for a first threshold time, and compares the temperature change value of the outdoor drive motor within a certain time interval with a third reference value to further determine whether the outdoor drive motor has a stall fault, thereby increasing the accuracy of the determination result.

[0026] In some embodiments, a third threshold and a fourth threshold are preset in the controller;

[0027] The controller is further configured to: after the outdoor drive motor runs for a third threshold time, compare the difference between the outdoor drive motor temperature and the outdoor ambient temperature with a fourth threshold; if the absolute value of the difference between the two is greater than or equal to a fourth reference value, determine that the outdoor drive motor has an overload fault.

[0028] This technical solution determines whether an overload fault occurs in the outdoor drive motor by comparing the difference between the outdoor drive motor temperature and the outdoor ambient temperature with a fourth threshold value after the outdoor drive motor runs for a third threshold time.

[0029] In some embodiments, the controller is further configured to: at a third moment after the outdoor drive motor is started, obtain the temperature of the outdoor drive motor and the outdoor ambient temperature and calculate the difference between the two as a third difference;

[0030] At a fourth moment after the outdoor drive motor is started, obtaining the temperature of the outdoor drive motor and the outdoor ambient temperature and calculating the difference between the two as a fourth difference;

[0031] If the absolute value of the difference between the third difference and the fourth threshold value and the absolute value of the difference between the fourth difference and the fourth threshold value are both greater than or equal to the fourth reference value, it is determined that an overload fault occurs in the outdoor drive motor.

[0032] This technical solution compares the absolute value of the difference between the outdoor drive motor temperature and the outdoor ambient temperature and the fourth threshold value with the fourth reference value after the outdoor drive motor is started for a third time and a fourth time, so as to further determine whether the outdoor drive motor has an overload fault and increase the accuracy of the determination result.

[0033] In some embodiments, the first motor temperature sensor is installed on the surface of the outdoor drive motor to detect the temperature of the surface of the outdoor drive motor.

[0034] In some embodiments, the first motor temperature sensor is installed inside the outdoor drive motor to detect the temperature inside the outdoor drive motor.

[0035] In addition, the present application also provides an air conditioner, including an indoor unit, the indoor unit including:

[0036] An indoor casing, which includes at least an indoor air inlet and an indoor air outlet;

[0037] An indoor heat exchanger is arranged in the indoor casing and is used to heat the air passing through the indoor heat exchanger to form air-conditioned air;

[0038] The indoor heat exchange fan is arranged in the indoor casing. The indoor heat exchange fan operates to introduce air from the indoor air inlet into the indoor casing, and then outputs air from the indoor air outlet after heat exchange in the indoor heat exchanger.

[0039] Indoor drive motor, used to drive the indoor heat exchange fan; the fault types of the indoor drive motor include open circuit fault, stall fault and overload fault;

[0040] A second motor temperature sensor is installed on the indoor drive motor and is used to detect the temperature of the indoor drive motor;

[0041] Indoor temperature sensor, used to detect the ambient temperature of the indoor drive motor;

[0042] A controller is connected to the second motor temperature sensor and the indoor temperature sensor respectively; the controller is configured as follows:

[0043] Control the operation of the indoor drive motor;

[0044] Whether the outdoor drive motor used to drive the indoor fan to operate is faulty and the fault type is determined according to the temperature information detected by the indoor temperature sensor and the temperature information detected by the second motor temperature sensor.

[0045] In some embodiments, the second motor temperature sensor is mounted on the surface or inside of the indoor drive motor.

[0046] In the above embodiment, an air conditioner in the present application compares the outdoor drive motor temperature with the outdoor ambient temperature to determine whether an open circuit fault occurs in the outdoor drive motor; compares the difference between the outdoor drive motor temperature and the outdoor ambient temperature with a second threshold value after the outdoor drive motor runs for a first threshold time to determine whether a stall fault occurs in the outdoor drive motor, and compares the temperature change value of the outdoor drive motor within a certain time interval with a third reference value to further determine whether a stall fault occurs in the outdoor drive motor; compares the difference between the outdoor drive motor temperature and the outdoor ambient temperature with a fourth threshold value after the outdoor drive motor runs for a third threshold time to determine whether an overload fault occurs in the outdoor drive motor, and compares the absolute value of the difference between the outdoor drive motor temperature and the outdoor ambient temperature and the fourth threshold value after the outdoor drive motor starts for a third time and after the outdoor drive motor starts for a fourth time with the fourth reference value to further determine whether an overload fault occurs in the outdoor drive motor.

[0047] The air conditioner can not only judge whether the outdoor drive motor fails but also judge the fault type of the outdoor drive motor at the same time, and the judging method is simple, the reliability is high and the judging result is accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 shows a schematic structural diagram of an air conditioner according to some embodiments;

[0049] Figure 2 A schematic diagram of the internal structure of an indoor unit of an air conditioner according to some embodiments is shown;

[0050] Figure 3 shows a temperature variation curve when an outdoor drive motor in an air conditioner works normally according to some embodiments;

[0051] Figure 4 shows a temperature variation curve when a stall fault occurs in an outdoor drive motor of an air conditioner according to some embodiments;

[0052] Figure 5 shows a temperature variation curve when an outdoor drive motor in an air conditioner has an overload fault according to some embodiments;

[0053] Figure 6 shows a temperature variation curve of an outdoor driving motor in an air conditioner under different conditions according to some embodiments;

[0054] Figure 7 A flow chart showing a determination of an open circuit fault in an outdoor drive motor in an air conditioner according to some embodiments is shown;

[0055] Figure 8A flow chart showing a determination of a stall fault of an outdoor drive motor in an air conditioner according to some embodiments is shown;

[0056] Fig. 9 A flow chart showing a determination of an overload fault of an outdoor drive motor in an air conditioner according to some embodiments;

[0057] Fig.10 The process of determining the working state of the outdoor drive motor in the air conditioner according to some embodiments is shown. Figure 1 ;

[0058] Fig.11 The process of determining the working state of the outdoor drive motor in the air conditioner according to some embodiments is shown. Figure 2 .

[0059] In the figure,

[0060] 100. Indoor unit; 200. Outdoor unit; 300. Outdoor drive motor; 400. Outdoor heat exchanger; 500. Outdoor fan. DETAILED DESCRIPTION

[0061] In order to make the purpose and implementation method of the present application clearer, the exemplary implementation method of the present application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0062] It should be noted that the brief description of terms in this application is only for the convenience of understanding the embodiments described below, and is not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their ordinary and common meanings.

[0063] The terms "first", "second", "third", etc. in the specification and claims of this application and the above drawings are used to distinguish similar or similar objects or entities, and do not necessarily mean to limit a specific order or sequence, unless otherwise noted. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances.

[0064] The terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover but not exclude inclusion, for example, a product or device comprising a list of components is not necessarily limited to all the components expressly listed but may include other components not expressly listed or inherent to such product or device.

[0065] Figure 1-Figure 11 This is a specific implementation of the wall-mounted fresh air air conditioner indoor unit 100 of the present application. In this embodiment, the air conditioner includes an outdoor unit 200 and an indoor unit 100.

[0066] like Figure 2 As shown, the outdoor unit 200 includes an outdoor casing, an outdoor heat exchanger 400, an outdoor fan 500 and an outdoor drive motor 300; the outdoor casing is used to form the overall appearance of the outdoor unit 200, and a accommodating cavity is formed inside the outdoor casing, and the outdoor casing is provided with an outdoor air inlet and an outdoor air outlet connected to the accommodating cavity; the outdoor heat exchanger 400 is arranged in the accommodating cavity and close to the outdoor air inlet; the outdoor fan 500 is arranged in the accommodating cavity and is located on the side of the outdoor heat exchanger 400 away from the outdoor air inlet. Through the operation of the outdoor fan 500, air is introduced into the accommodating cavity from the outdoor air inlet, exchanges heat with the outdoor heat exchanger 400, and then outputs the accommodating cavity from the outdoor air outlet; the outdoor drive motor 300 is used to drive the outdoor fan 500 to operate.

[0067] The indoor unit 100 includes an indoor casing, an indoor heat exchanger, an indoor fan and an outdoor drive motor 300; the indoor casing is used to form the overall appearance of the indoor unit 100; the indoor casing includes an indoor air inlet and an indoor air outlet; an indoor heat exchange channel is defined in the indoor casing, and the indoor air inlet and the indoor air outlet are respectively connected to the indoor heat exchange channel; the indoor heat exchanger is arranged in the indoor heat exchange channel, and is used to heat the air passing through the heat exchange channel to form air-conditioned wind; the indoor fan is arranged in the indoor heat exchange channel, and through the operation of the indoor fan, the indoor air is introduced into the indoor heat exchange channel from the indoor air inlet, and the air-conditioned wind is formed through the indoor heat exchanger and output to the indoor through the rear indoor air outlet; the outdoor drive motor 300 is used to drive the indoor fan to operate.

[0068] The outdoor heat exchanger 400 and the indoor heat exchanger are connected to each other through a pipeline, and a refrigerant flows in the pipeline. The refrigerant flows in the outdoor heat exchanger 400 and the indoor heat exchanger, and heat is exchanged between the refrigerant and the air to form a heating cycle or a cooling cycle, thereby achieving heating or cooling of the indoor air. When the indoor heat exchanger is used as a condenser, the indoor unit 100 is used as a heater in the heating mode, and when the indoor heat exchanger is used as an indoor heat exchanger, the indoor unit 100 is used as a cooler in the cooling mode.

[0069] The air conditioner also includes a controller, which is connected to the outdoor drive motor 300 to control the operation of the outdoor drive motor 300, so that the outdoor drive motor 300 drives the outdoor fan 500 to operate or drives the indoor fan to operate; it should be noted that the indoor fan and the outdoor fan 500 are respectively provided with corresponding outdoor drive motors 300.

[0070] In some embodiments, the indoor unit 100 and the outdoor unit 200 are respectively provided with a controller, the controller of the indoor unit 100 is installed on the indoor unit 100, and the controller of the outdoor unit 200 is installed on the outdoor unit 200. The controller of the indoor unit 100 is connected to an outdoor drive motor 300 for driving the indoor fan, and the outdoor controller is connected to an outdoor drive motor 300 for driving the outdoor fan 500.

[0071] In other embodiments, the indoor controller and the outdoor controller share a controller, and the controller is installed in the indoor unit 100, and the controller is respectively connected to the outdoor drive motor 300 for driving the indoor fan and the outdoor drive motor 300 for driving the outdoor fan 500.

[0072] In the air conditioner, the outdoor drive motor 300 is usually a single-phase asynchronous AC motor. The outdoor drive motor 300 may fail in actual operation, causing the outdoor unit 200 or the indoor unit 100 to fail to work properly. The fault types of the outdoor drive motor 300 usually include open circuit fault, stall fault and overload fault. Among them, open circuit fault refers to faults such as no power signal output from the controller or internal wire breakage of the motor; stall fault refers to faults caused by the controller having normal power signal output but being stuck due to external or internal mechanical obstructions of the motor; overload fault refers to the motor being in an abnormal overloaded operating state. Common scenarios include severe dirt and blockage of the outdoor heat exchanger 400, and foreign objects blocking the outdoor air inlet or outdoor air outlet.

[0073] When the outdoor drive motor 300 works normally, current will be supplied to the outdoor drive motor 300, and as the outdoor drive motor 300 works, the outdoor drive motor 300 will continuously generate heat, resulting in an increase in the internal and surface temperatures of the outdoor drive motor 300. Since the heat generated by the outdoor drive motor 300 will be dissipated through the air, Figure 3 and Figure 6 As shown, when the temperature inside and on the surface of the outdoor drive motor 300 rises to a certain temperature, it will tend to stabilize instead of continuing to rise. When the outdoor drive motor 300 stops working, as time goes by, the temperature inside and on the surface of the outdoor drive motor 300 will drop to the temperature of the environment in which the outdoor drive motor 300 is located.

[0074] When an open circuit fault occurs in the outdoor drive motor 300, since no current flows into the outdoor drive motor 300, the outdoor drive motor 300 does not work, and the outdoor drive motor 300 does not generate heat. The temperature of the outdoor drive motor 300 is usually substantially consistent with the ambient temperature of the outdoor drive motor 300.

[0075] When the outdoor drive motor 300 is blocked, current is passed through the outdoor drive motor 300, and the internal winding of the outdoor drive motor 300 continues to heat up, and the temperature rises sharply. In order to prevent the outdoor drive motor 300 from being burned out, in the prior art, a thermostat is usually installed inside the outdoor drive motor 300, such as Figure 4 and Figure 6 As shown, when the internal temperature of the outdoor drive motor 300 rises to a certain value, the thermostat will automatically cut off the power supply, preventing the current from flowing into the outdoor drive motor 300, so that the outdoor drive motor 300 is in an open circuit state. After the outdoor drive motor 300 is in an open circuit state, the outdoor drive motor 300 does not work, so that the outdoor drive motor 300 will not continue to generate heat, and as time goes by, the heat previously generated by the outdoor drive motor 300 is continuously dissipated, and the internal and surface temperatures of the outdoor drive motor 300 will gradually decrease until they are substantially consistent with the ambient temperature of the outdoor drive motor 300.

[0076] When the outdoor drive motor 300 is overloaded, the outdoor drive motor 300 works, but the speed of the outdoor drive motor 300 decreases, the motor efficiency decreases, and the internal heat of the outdoor drive motor 300 is serious. Figure 5 and Figure 6 As shown, the temperature rise of the outdoor drive motor 300 will be significantly higher than that in the normal operating state.

[0077] The air conditioner is provided with an ambient temperature sensor to detect the ambient temperature of the outdoor drive motor 300, and a motor temperature sensor to detect the temperature of the outdoor drive motor 300, and uses the relationship between the ambient temperature and the temperature of the outdoor drive motor 300 to determine whether the outdoor drive motor 300 has a fault and the type of fault.

[0078] In this embodiment, an outdoor drive motor 300 used to drive an outdoor fan 500 is taken as an example to introduce an outdoor temperature sensor to detect the outdoor ambient temperature and a motor temperature sensor to detect the temperature of the outdoor drive motor 300. The relationship between the outdoor ambient temperature and the temperature of the outdoor drive motor 300 is used to determine the fault type of the outdoor drive motor 300.

[0079] Specifically, the outdoor temperature sensor and the motor temperature sensor are connected to the controller respectively, and the controller receives the outdoor environment temperature information detected by the outdoor temperature sensor and the outdoor drive motor 300 temperature information detected by the motor temperature sensor. Among them, the outdoor environment temperature detected by the outdoor temperature sensor is recorded as Tw, and the outdoor drive motor 300 temperature detected by the motor temperature sensor is Td.

[0080] like Figure 7As shown, at the first moment t1 after the controller controls the outdoor drive motor 300 to start, the temperature of the outdoor drive motor 300 and the outdoor ambient temperature Tw are obtained and the difference between the two is calculated as the first difference; at the second moment t2 after the controller controls the outdoor drive motor 300 to start, the temperature of the outdoor drive motor 300 and the outdoor ambient temperature Tw are obtained and the difference between the two is calculated as the second difference; if the first difference and the second difference are both less than or equal to the first reference value, it is determined that an open circuit fault occurs in the outdoor drive motor 300.

[0081] It should be noted that the temperature Td of the outdoor drive motor 300 is usually not lower than the outdoor ambient temperature Tw. Therefore, the difference between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw is usually not a negative value.

[0082] It should also be noted that there is usually a time interval between the first time t1 and the second time t2. In some embodiments, the two are usually separated by 5 minutes to increase the accuracy of the judgment result.

[0083] like Figure 8 As shown, a first threshold Δtb and a second threshold ΔK1 are pre-set in the controller, wherein the first threshold Δtb is the time taken for the outdoor drive motor 300 to start stalling and the thermostat to disconnect, and the second threshold ΔK1 is the difference between the temperature of the outdoor drive motor 300 and the outdoor ambient temperature when the thermostat is disconnected.

[0084] It should be noted that the second threshold ΔK1 is usually greater than the difference between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw when the outdoor drive motor 300 works normally.

[0085] The controller is further configured to: after the outdoor drive motor 300 runs for a first threshold value Δtb time, compare the difference ΔKb between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw (i.e., Td-Tw=ΔKb) with a second threshold value ΔK1; if the absolute value of the difference between the two is less than or equal to a second reference value n (i.e., |ΔKb-ΔK1|≤n), it is determined that the outdoor drive motor 300 has a stall fault.

[0086] It should be noted that the stall failure of the outdoor drive motor 300 usually exists when the outdoor drive motor 300 starts working, and usually does not occur again during the operation of the outdoor drive motor 300. Therefore, if the outdoor drive motor 300 has a stall failure, after the outdoor drive motor 300 runs for a first threshold value Δtb time, the difference ΔKb between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw is usually close to or equal to the second threshold value ΔK1. In this embodiment, the second reference value n is set to take into account the influence of other factors such as heat dissipation, and its purpose is to increase the accuracy of the judgment result.

[0087] The absolute value of the difference ΔKb between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw and the second threshold ΔK1 is less than or equal to the second reference value n, indicating that the surface temperature of the outdoor drive motor 300 is relatively high, close to the temperature when the outdoor drive motor 300 is blocked. At this time, the possibility of the outdoor drive motor 300 being blocked is relatively high, but it is also possible that the temperature of the outdoor drive motor 300 is high due to an overload of the outdoor drive motor 300. In order to prevent misjudgment, it is necessary to further determine whether the outdoor drive motor 300 has a blocked fault.

[0088] The controller is further configured to: determine the change value ΔTd of the temperature Td of the outdoor drive motor 300 within a certain time interval; if the change value ΔTd of the temperature of the outdoor drive motor 300 within a certain time interval is greater than or equal to a third reference value a (ie, ΔTd≥a), it is determined that the outdoor drive motor 300 has a stall fault.

[0089] It should be noted that if the outdoor drive motor 300 has a stall failure, the temperature of the outdoor drive motor 300 will continue to rise with the increase of time until the thermostat is disconnected. After the thermostat is disconnected, since the outdoor drive motor 300 is in an open circuit state, the outdoor drive motor 300 does not work. As time goes by, the heat previously generated by the outdoor drive motor 300 gradually dissipates, causing the temperature of the outdoor drive motor 300 to decrease. If the outdoor drive motor 300 has an overload failure, the outdoor drive motor 300 will continue to work, and the heat generated by the outdoor drive motor 300 will continue to increase. Therefore, by comparing the change value ΔTd of the temperature Td of the outdoor drive motor 300 within a certain time interval with the third reference value a, it can be determined whether the outdoor drive motor 300 has a stall failure.

[0090] It should also be noted that when the running time of the outdoor drive motor 300 exceeds the first threshold value Δtb, if the outdoor drive motor 300 is blocked, the temperature value of the outdoor drive motor 300 at a later moment is usually lower than the temperature value at a previous moment. If the outdoor drive motor 300 is overloaded, the temperature value of the outdoor drive motor 300 at a later moment may be higher than the temperature value at a previous moment. It is also possible that the temperature of the outdoor drive motor 300 does not change. Usually, the temperature value of the outdoor drive motor 300 at a later moment is lower than the temperature value at a previous moment.

[0091] If the outdoor drive motor 300 has an overload fault and the temperature value of the outdoor drive motor 300 at a later moment is higher than the temperature value at a previous moment, it is easy to cause the change value ΔTd of the temperature Td of the outdoor drive motor 300 within a certain time interval to be the same as the change value ΔTd of the temperature Td of the outdoor drive motor 300 within a certain time interval when the outdoor drive motor 300 has a stall fault, thereby affecting the judgment result.

[0092] Therefore, in this embodiment, the change value ΔTd of the temperature Td of the outdoor drive motor 300 within a certain time interval = the difference between the temperature value of the outdoor drive motor 300 at the previous moment and the temperature value of the outdoor drive motor 300 at the next moment, so that if the outdoor drive motor 300 has a stall fault, the change value ΔTd of the temperature Td of the outdoor drive motor 300 within a certain time interval is a positive value, and if the outdoor drive motor 300 has an overload fault, the change value ΔTd of the temperature Td of the outdoor drive motor 300 within a certain time interval is a negative value, thereby distinguishing the two.

[0093] In some embodiments, the controller generally compares the change value ΔTd of the temperature of the outdoor drive motor 300 with the third reference value a within multiple time intervals. Through multiple comparisons, on the one hand, the accuracy of the judgment result can be increased, and on the other hand, the time interval can be shortened, so that it can be determined in time whether the outdoor drive motor 300 has a stall fault.

[0094] like Fig. 9 As shown, a third threshold value Δty and a fourth threshold value ΔK2 are also pre-set in the controller. The third threshold value Δty is the time taken for the outdoor drive motor 300 to start from the beginning to the time when the temperature Td of the outdoor drive motor 300 tends to be stable; the fourth threshold value ΔK2 is the difference between the outdoor drive motor 300 and the outdoor ambient temperature when the temperature Td of the outdoor drive motor 300 tends to be stable.

[0095] It should be noted that the fourth threshold ΔK2 is usually greater than the difference between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw when the outdoor drive motor 300 is working normally, and the fourth threshold ΔK2 is usually not greater than the difference between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw when the outdoor drive motor 300 is blocked, that is, the fourth threshold ΔK2 is usually not greater than the second threshold ΔK1.

[0096] The controller is further configured to: after the outdoor drive motor 300 runs for a third threshold value Δty time, compare the difference ΔKb between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw with a fourth threshold value ΔK2; if the absolute value of the difference between the two is greater than or equal to a fourth reference value b (i.e., |ΔKb-ΔK2|≥b), it is determined that the outdoor drive motor 300 has an overload fault.

[0097] When the outdoor drive motor 300 is stalled, the temperature Td of the outdoor drive motor 300 will also be higher than the temperature when the outdoor drive motor 300 is working normally. Therefore, the absolute value of the difference ΔKb between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw and the fourth threshold ΔK2 being greater than or equal to the fourth reference value b may also be caused by the stalling of the outdoor drive motor 300. Therefore, it is necessary to further determine whether the outdoor drive motor 300 has an overload fault.

[0098] The controller is further configured to compare the difference ΔKb between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw with a fourth threshold ΔK2 at a third moment t3 and a fourth moment t4 after the outdoor drive motor 300 is started, respectively; if the absolute value of the difference between the two is greater than or equal to a fourth reference value b at the third moment t3 and the fourth moment t4 after the outdoor drive motor 300 is started, it is determined that an overload fault occurs in the outdoor drive motor 300.

[0099] In other words, the controller is further configured to: at a third moment t3 after the outdoor drive motor 300 is started, obtain the temperature of the outdoor drive motor 300 and the outdoor ambient temperature Tw and calculate the difference between the two as a third difference; at a fourth moment t4 after the outdoor drive motor 300 is started, obtain the temperature of the outdoor drive motor 300 and the outdoor ambient temperature Tw and calculate the difference between the two as a fourth difference; if the absolute value of the difference between the third difference and the fourth threshold value and the absolute value of the difference between the fourth difference and the fourth threshold value are both greater than or equal to the fourth reference value, it is determined that the outdoor drive motor 300 has an overload fault.

[0100] In some embodiments, the outdoor temperature sensor is installed on the outdoor housing, and the motor temperature sensor is installed on the surface of the outdoor drive motor 300 to detect the surface temperature of the outdoor drive motor 300 .

[0101] In some embodiments, a motor temperature sensor is installed inside the outdoor drive motor 300 to detect the internal temperature of the outdoor drive motor 300 .

[0102] In some embodiments, the motor temperature sensor adopts an NTC resistance temperature sensor, one end of which is a temperature sensing head and the other end is an input terminal. The temperature sensing head of the motor temperature sensor is fixed inside the motor or on the surface of the motor to collect the real-time temperature inside or on the surface of the motor. The motor temperature sensor is parallel to the motor power line and connected to the interface socket of the air conditioner control board.

[0103] In some embodiments, the air conditioner also includes an alarm device, which is electrically connected to the controller. When the controller determines that the outdoor drive motor is faulty, the alarm device is controlled to sound an alarm to remind the user of the outdoor drive motor failure, thereby improving the safety and reliability of the air conditioner.

[0104] In other embodiments, the controller controls the alarm device to send different alarm signals according to the fault type of the outdoor drive motor, so that the user can know the fault type of the outdoor drive motor in time.

[0105] The alarm device is a conventional technical means in this field and will not be described in detail here.

[0106] The air conditioner first determines whether an open circuit fault occurs in the outdoor drive motor 300. If the open circuit fault does not occur in the outdoor drive motor 300, it determines whether a stall fault occurs in the outdoor drive motor 300. If the stall fault does not occur in the outdoor drive motor 300, it determines whether an overload fault occurs in the outdoor drive motor 300. If the overload fault does not occur in the outdoor drive motor 300, it determines that the outdoor drive motor 300 is operating normally.

[0107] Specifically, Fig.10 As shown, after the controller controls the outdoor drive motor 300 to start and run for the first time t1, if the difference between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw is less than or equal to the first reference value m, that is, Td-Tw≤m, and after the outdoor drive motor 300 starts and runs for the second time t2, the difference between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw is also less than or equal to the first reference value m, then it is determined that an open circuit fault occurs in the outdoor drive motor 300. If the difference between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw is greater than the first reference value m, that is, Td-Tw>m, or after the controller controls the outdoor drive motor 300 to start at the first moment t1, the difference between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw is less than or equal to the first reference value m, but after the outdoor drive motor 300 starts at the second moment t2, the difference between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw is greater than the first reference value m, then it is determined that the outdoor drive motor 300 does not have an open circuit fault. At this time, it is impossible to determine whether the outdoor drive motor 300 is operating normally or has a stall fault or an overload fault, and further judgment is required.

[0108] After the outdoor drive motor 300 continues to run for the first threshold value Δtb time, if the absolute value of the difference between the difference ΔKb between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw and the second threshold value ΔK1 is less than or equal to the second reference value n, and the change value ΔTd of the temperature of the outdoor drive motor 300 within a certain time interval is greater than or equal to the third reference value a, it is determined that a stall fault occurs in the outdoor drive motor 300. If the absolute value of the difference between the difference ΔKb between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw and the second threshold value ΔK1 is greater than the second reference value n, or the absolute value of the difference between the difference ΔKb between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw and the second threshold value ΔK1 is less than or equal to the second reference value n, but the change value ΔTd of the temperature of the outdoor drive motor 300 is less than the third reference value a, it is determined that the outdoor drive motor 300 does not have a stall fault, and at this time it cannot be determined whether the outdoor drive motor 300 is operating normally or has an overload fault, and further judgment is required.

[0109] After the outdoor drive motor 300 runs for a third threshold value Δty time, if the absolute value of the difference between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw ΔKb and the fourth threshold value ΔK2 is greater than or equal to the fourth reference value b, and at the third time t3 and the fourth time t4 when the outdoor drive motor 300 is started, the absolute value of the difference between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw ΔKb and the fourth threshold value ΔK2 is greater than or equal to the fourth reference value b, it is determined that the outdoor drive motor 300 has an overload fault; if the difference between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw is greater than or equal to the fourth reference value b, the outdoor drive motor 300 is determined to have ... The absolute value of the difference between ΔKb and the fourth threshold value ΔK2 is less than the fourth reference value b, or the absolute value of the difference between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw ΔKb and the fourth threshold value ΔK2 is greater than or equal to the fourth reference value b, but after the outdoor drive motor 300 starts at the third moment t3 and after the outdoor drive motor 300 starts at the fourth moment t4, the absolute value of the difference between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw ΔKb and the fourth threshold value ΔK2 is less than the fourth reference value b, then it is determined that the outdoor drive motor 300 does not have an overload fault, and at this time it is determined that the outdoor drive motor 300 is operating normally.

[0110] In some embodiments, the air conditioner first determines whether an open circuit fault occurs in the outdoor drive motor 300. If the outdoor drive motor 300 does not have an open circuit fault, it determines whether an overload fault occurs in the outdoor drive motor 300. If the outdoor drive motor 300 does not have an overload fault, it determines whether a stall fault occurs in the outdoor drive motor 300. If the outdoor drive motor 300 does not have a stall fault, it determines that the outdoor drive motor 300 is operating normally.

[0111] Specifically, Fig.11As shown, after the controller controls the outdoor drive motor 300 to start and run for the first time t1, if the difference between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw is less than or equal to the first reference value m, that is, Td-Tw≤m, and after the outdoor drive motor 300 starts and runs for the second time t2, the difference between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw is also less than or equal to the first reference value m, then it is determined that an open circuit fault occurs in the outdoor drive motor 300. If the difference between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw is greater than the first reference value m, that is, Td-Tw>m, or after the controller controls the outdoor drive motor 300 to start at the first moment t1, the difference between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw is less than or equal to the first reference value m, but after the outdoor drive motor 300 starts at the second moment t2, the difference between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw is greater than the first reference value m, then it is determined that the outdoor drive motor 300 does not have an open circuit fault. At this time, it is impossible to determine whether the outdoor drive motor 300 is operating normally or has a stall fault or an overload fault, and further judgment is required.

[0112] After the outdoor drive motor 300 runs for a third threshold value Δty time, if the absolute value of the difference between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw ΔKb and the fourth threshold value ΔK2 is greater than or equal to the fourth reference value b, and at the third time t3 and the fourth time t4 when the outdoor drive motor 300 is started, the absolute value of the difference between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw ΔKb and the fourth threshold value ΔK2 is greater than or equal to the fourth reference value b, it is determined that the outdoor drive motor 300 has an overload fault; if the difference between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw ΔKb and the fourth threshold value ΔK2 is greater than or equal to the fourth reference value b, 2 is less than the fourth reference value b, or the absolute value of the difference ΔKb between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw and the fourth threshold ΔK2 is greater than or equal to the fourth reference value b, but after the outdoor drive motor 300 starts at the third moment t3 and after the outdoor drive motor 300 starts at the fourth moment t4, the absolute value of the difference ΔKb between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw and the fourth threshold ΔK2 is less than the fourth reference value b, then it is determined that the outdoor drive motor 300 does not have an overload fault. At this time, it is impossible to determine whether the outdoor drive motor 300 is operating normally or has a stall fault, and further judgment is required.

[0113] After the outdoor drive motor 300 continues to run for the first threshold value Δtb time, if the absolute value of the difference between the difference ΔKb between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw and the second threshold value ΔK1 is less than or equal to the second reference value n, and the change value ΔTd of the temperature of the outdoor drive motor 300 within a certain time interval is greater than or equal to the third reference value a, it is determined that a stall fault occurs in the outdoor drive motor 300. If the absolute value of the difference between the difference ΔKb between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw and the second threshold value ΔK1 is greater than the second reference value n, or the absolute value of the difference between the difference ΔKb between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw and the second threshold value ΔK1 is less than or equal to the second reference value n, but the change value ΔTd of the temperature of the outdoor drive motor 300 is less than the third reference value a, it is determined that no stall fault occurs in the outdoor drive motor 300, and the outdoor drive motor 300 is determined to be operating normally.

[0114] It should be noted that if neither an open circuit fault, nor a stall fault nor an overload fault occurs after the outdoor drive motor 300 is started, it can generally be determined that the outdoor drive motor 300 is operating normally.

[0115] The following is a detailed description of the method for determining the fault type of the outdoor drive motor 300 using specific numerical values, wherein the first moment t1 is the 5th minute after the outdoor drive motor 300 is started, the second moment t2 is the 10th minute after the outdoor drive motor 300 is started, the first reference value m is 5, the second reference value n is 5, the third reference value a is 3, the fourth reference value b is 20, the third moment t3 is the 30th minute after the outdoor drive motor 300 is started, and the fourth moment t4 is the 60th minute after the outdoor drive motor 300 is started.

[0116] After the controller controls the outdoor drive motor 300 to start for 5 minutes, the difference between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw is greater than 5, that is, Td-Tw>5, then it is determined that the outdoor drive motor 300 does not have an open circuit fault, and it is necessary to further determine the state of the outdoor drive motor 300; if the difference between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw is less than or equal to 5, that is, Td-Tw≤5, then the difference between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw 10 minutes after the outdoor drive motor 300 is started is further determined. If the difference between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw is also less than or equal to 5, then it is determined that an open circuit fault occurs in the outdoor drive motor 300; if the difference between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw is greater than 5, then it is determined that the outdoor drive motor 300 does not have an open circuit fault, and it is necessary to further determine the state of the outdoor drive motor 300.

[0117] After the outdoor drive motor 300 runs for a first threshold value Δtb time, the difference ΔKb between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw is compared with the second threshold value ΔK1. If the absolute value of the difference between the two is greater than 5, it is determined that the outdoor drive motor 300 does not have a stall fault, and it is necessary to further determine the state of the outdoor drive motor 300; if the absolute value of the difference between the two is less than or equal to 5 (i.e., |ΔKb-ΔK1|≤5), the change value ΔTd of the temperature of the outdoor drive motor 300 is calculated every one minute. If the change value ΔTd of the temperature of the outdoor drive motor 300 is greater than or equal to 3, it is determined that the outdoor drive motor 300 has a stall fault; if the change value ΔTd of the temperature of the outdoor drive motor 300 within a time interval of one minute is less than 3, it is determined that the outdoor drive motor 300 does not have a stall fault, and it is necessary to further determine the state of the outdoor drive motor 300.

[0118] After the outdoor drive motor 300 runs for a third threshold value Δty time, the difference ΔKb between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw is compared with the fourth threshold value ΔK2. If the absolute value of the difference between the two is less than 20, it is determined that the outdoor drive motor 300 does not have an overload fault; if the absolute value of the difference between the two is greater than or equal to 20 (i.e., |ΔKb-ΔK2|≥20), the temperature Td of the outdoor drive motor 300 is further measured 30 minutes after the outdoor drive motor 300 is started and 60 minutes after the outdoor drive motor 300 is started. The difference ΔKb between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw is compared with the fourth threshold ΔK2. If the absolute values ​​of the difference ΔKb between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw and the fourth threshold ΔK2 are both greater than or equal to 20, it is determined that an overload fault occurs in the outdoor drive motor 300; if at least one of the absolute values ​​of the difference ΔKb between the temperature Td of the outdoor drive motor 300 and the outdoor ambient temperature Tw and the fourth threshold ΔK2 is less than 20, it is determined that no overload fault occurs in the outdoor drive motor 300.

[0119] The air conditioner compares the temperature of the outdoor drive motor 300 with the outdoor ambient temperature to determine whether an open circuit fault occurs in the outdoor drive motor 300; compares the difference between the temperature of the outdoor drive motor 300 and the outdoor ambient temperature with the second threshold value ΔK1 after the outdoor drive motor runs for a first threshold value Δtb time to determine whether a stall fault occurs in the outdoor drive motor 300, and compares the temperature change value ΔTd of the outdoor drive motor 300 within a certain time interval with the third reference value a to further determine whether a stall fault occurs in the outdoor drive motor 300; compares the difference between the temperature of the outdoor drive motor 300 and the outdoor ambient temperature with the fourth threshold value ΔK2 after the outdoor drive motor 300 runs for a third threshold value Δty time to determine whether an overload fault occurs in the outdoor drive motor 300, and compares the absolute value of the difference between the temperature Td of the outdoor drive motor and the outdoor ambient temperature Tw and the fourth threshold value ΔK2 with the fourth reference value b after the outdoor drive motor 300 starts at a third time t3 and a fourth time t4, to further determine whether an overload fault occurs in the outdoor drive motor 300.

[0120] The above-mentioned air conditioner places a motor temperature sensor inside or on the surface of the motor, uses a controller to monitor the temperature of the outdoor drive motor in real time, and uses the different temperature rise characteristics of the outdoor drive motor 300 in different scenarios to compare the temperature of the outdoor drive motor with the outdoor ambient temperature to determine whether the outdoor drive motor is faulty and the type of fault. The judgment method is simple, reliable, and the judgment result is accurate.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0122] For the convenience of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. An air conditioner, comprising an outdoor unit, characterized in that: The outdoor unit comprises: An outdoor casing having an accommodating cavity formed therein, wherein the outdoor casing is provided with an outdoor air inlet and an outdoor air outlet communicated with the accommodating cavity; An outdoor heat exchanger is disposed in the accommodating cavity and close to the outdoor air inlet; An outdoor fan is disposed in the accommodating cavity and is located on a side of the outdoor heat exchanger away from the outdoor air inlet; An outdoor drive motor is used to drive the outdoor fan to operate; the fault types of the outdoor drive motor include open circuit fault, stall fault and overload fault; A first motor temperature sensor, which is installed on the outdoor drive motor and is used to detect the temperature of the outdoor drive motor; Outdoor temperature sensor, used to detect outdoor ambient temperature; A controller is connected to the outdoor drive motor, the first motor temperature sensor and the outdoor temperature sensor respectively; the outdoor controller is configured as follows: Controlling the outdoor drive motor to operate; Whether the outdoor drive motor has a fault and the type of the fault are determined according to the temperature information detected by the outdoor temperature sensor and the temperature information detected by the first motor temperature sensor.

2. The air conditioner according to claim 1, characterized in that: The controller is further configured to: at a first moment after the outdoor drive motor is started, obtain the temperature of the outdoor drive motor and the outdoor ambient temperature and calculate the difference between the two as a first difference; At a second moment after the outdoor drive motor is started, obtaining the temperature of the outdoor drive motor and the outdoor ambient temperature and calculating the difference between the two as a second difference; If the first difference and the second difference are both smaller than or equal to a first reference value, it is determined that an open circuit fault occurs in the outdoor drive motor.

3. The air conditioner according to claim 1, characterized in that: A thermostat is installed inside the outdoor drive motor. When the temperature of the outdoor drive motor rises to a certain value, the thermostat is disconnected to prevent current from flowing into the outdoor drive motor.

4. The air conditioner according to claim 1, characterized in that: The controller is pre-set with a first threshold and a second threshold; The controller is further configured to: when the outdoor drive motor runs for a first threshold time, compare the difference between the outdoor drive motor temperature and the outdoor ambient temperature with the second threshold; if the absolute value of the difference between the two is less than or equal to a second reference value, further determine the change value of the outdoor drive motor temperature within a certain time interval; if the change value of the outdoor drive motor temperature within a certain time interval is greater than or equal to a third reference value, determine that the outdoor drive motor has a stall fault.

5. The air conditioner according to claim 1, characterized in that: The controller is pre-set with a third threshold and a fourth threshold; The controller is further configured to: after the outdoor drive motor runs for a third threshold time, compare the difference between the temperature of the outdoor drive motor and the outdoor ambient temperature with the fourth threshold; if the absolute value of the difference between the two is greater than or equal to a fourth reference value, determine that the outdoor drive motor has an overload fault.

6. The air conditioner according to claim 5, characterized in that: The controller is further configured to: at a third moment after the outdoor drive motor is started, obtain the temperature of the outdoor drive motor and the outdoor ambient temperature and calculate the difference between the two as a third difference; At a fourth moment after the outdoor drive motor is started, obtaining the temperature of the outdoor drive motor and the outdoor ambient temperature and calculating the difference between the two as a fourth difference; If the absolute value of the difference between the third difference and the fourth threshold and the absolute value of the difference between the fourth difference and the fourth threshold are both greater than or equal to a fourth reference value, it is determined that an overload fault occurs in the outdoor drive motor.

7. The air conditioner according to claim 1, characterized in that: The first motor temperature sensor is installed on the surface of the outdoor drive motor and is used to detect the temperature of the surface of the outdoor drive motor.

8. The air conditioner according to claim 1, characterized in that: The first motor temperature sensor is installed inside the outdoor drive motor and is used to detect the temperature inside the outdoor drive motor.

9. An air conditioner, comprising an indoor unit, characterized in that: The indoor unit comprises: An indoor casing, which includes at least an indoor air inlet and an indoor air outlet; An indoor heat exchanger, which is arranged in the indoor casing and is used to heat the air passing through the indoor heat exchanger to form air-conditioned air; An indoor heat exchange fan is arranged in the indoor casing, and the indoor heat exchange fan operates to introduce air into the indoor casing from the indoor air inlet, and outputs air from the indoor air outlet after heat exchange in the indoor heat exchanger; An indoor drive motor is used to drive the indoor heat exchange fan to operate; the fault types of the indoor drive motor include open circuit fault, stall fault and overload fault; a second motor temperature sensor, which is installed on the indoor drive motor and is used to detect the temperature of the indoor drive motor; An indoor temperature sensor, used to detect the ambient temperature of the indoor drive motor; A controller is connected to the second motor temperature sensor and the indoor temperature sensor respectively; the controller is configured as follows: Controlling the indoor drive motor to work; Whether the outdoor driving motor for driving the indoor fan to operate is faulty and the type of the fault is determined according to the temperature information detected by the indoor temperature sensor and the temperature information detected by the second motor temperature sensor.

10. The air conditioner according to claim 9, characterized in that: The second motor temperature sensor is installed on the surface or inside of the indoor drive motor.

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