Direct-current motor assembly of constant-speed air conditioner outdoor unit, and constant-speed air conditioner outdoor unit

Abstract

The present application discloses a direct-current motor assembly of a constant-speed air conditioner outdoor unit, and a constant-speed air conditioner outdoor unit. The direct-current motor assembly of the constant-speed air conditioner outdoor unit comprises: a direct-current motor body; an input interface, configured to be connected to a mains supply; a power supply module, an input end of the power supply module being connected to the input interface, and the power supply module being configured to convert the connected mains supply into a direct-current power supply and then output the direct-current power supply; and a driving module, a power input end of the driving module being connected to an output end of the power supply module, an output end of the driving module being connected to the direct-current motor, and the driving module being configured to convert the direct-current power supply into a driving power supply and then output the driving power supply to the direct-current motor body, so as to drive the direct-current motor body to work at a predetermined rotating speed.

Description

DC motor assembly of fixed-speed air conditioner outdoor unit and fixed-speed air conditioner outdoor unit

[0001] This application claims priority to Chinese patent application No. 202311028671.4 filed on August 15, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of constant-speed air conditioners, and in particular to a DC motor assembly of a constant-speed air conditioner outdoor unit and the constant-speed air conditioner outdoor unit. Background Art

[0003] Most current fixed-speed air conditioner outdoor units lack an electronic control board. Therefore, their outdoor fan motors are typically AC asynchronous motors, with the live and neutral wires of the AC power supply connected directly to the motor terminals. However, the current technical solution of using AC asynchronous motors for fixed-speed outdoor motors has numerous drawbacks. The AC motor's speed lacks closed-loop control and is easily affected by fluctuations in the mains power supply. Furthermore, unstable mains power can easily cause excessive motor temperature rise, triggering the protector and causing the unit to trip. Furthermore, due to the torque curve characteristics of single-phase asynchronous AC motors, the high-efficiency speed range is very narrow, and the maximum efficiency is limited. Typically, a 50Hz motor has a maximum efficiency of 50%-65%, while a 60Hz motor has a maximum efficiency of 40%-55%. Furthermore, the maximum speed is affected by the AC motor's slip and is generally set within 900 rpm. Therefore, the overall unit's performance and energy efficiency are significantly affected by the AC motor's input power and speed. Technical issues

[0004] The main purpose of this application is to propose a DC motor assembly for a constant-speed air conditioner outdoor unit, aiming to solve the problem that the constant-speed air conditioner outdoor unit is easily affected by the input power supply. Technical Solutions

[0005] To achieve the above-mentioned purpose, the present application proposes a DC motor assembly for a constant-speed air conditioner outdoor unit, wherein the DC motor assembly for the constant-speed air conditioner outdoor unit comprises:

[0006] DC motor body;

[0007] Input interface, used to access the mains power;

[0008] A power supply module, the input end of which is connected to the input interface, and the power supply module is used to convert the input mains power into a DC power supply for output;

[0009] A driving module, wherein the power input end of the driving module is connected to the output end of the power module, and the output end of the driving module is connected to the DC motor. The driving module is used to convert the DC power supply into a driving power supply and output it to the DC motor body to drive the DC motor body to operate at a predetermined speed.

[0010] In one embodiment, the driving module and the power supply module are integrated into the DC motor body.

[0011] In one embodiment, the DC motor body includes a housing and an end cover matched with the housing, wherein the end cover and the housing are matched to form a receiving cavity;

[0012] The driving module and the power supply module are arranged on a side surface of the end cover close to the housing.

[0013] In one embodiment, the driving module further has a first power supply terminal and a second power supply terminal;

[0014] The first power supply output end of the power supply module is connected to the first power supply end of the driving module, and the second power supply output end of the power supply module is connected to the second power supply end of the driving module. The power supply module is also used to convert the connected mains power into a first power supply and output it from the first power supply output end, and convert the connected mains power into a second power supply and output it from the second power supply output end to power the driving module.

[0015] In one embodiment, the driving module includes:

[0016] a motor drive circuit, wherein the input end of the motor drive circuit is connected to the output end of the power module, and the motor drive circuit is used to convert the DC power supply into a drive power supply and output it to the DC motor body, so as to drive the DC motor body to operate at a predetermined speed;

[0017] A control circuit, wherein the control end of the control circuit is connected to the controlled end of the motor drive circuit, and the control circuit is used to control the motor drive circuit to convert the DC power supply into a drive power supply and output it to the DC motor, so as to drive the DC motor body to operate at a predetermined speed.

[0018] In one embodiment, the power module includes:

[0019] a rectifier circuit, wherein the input end of the rectifier circuit is connected to the input interface, and the rectifier circuit is used to convert the input AC mains power into DC power for output;

[0020] a switching power supply circuit, wherein the input end of the switching power supply circuit is connected to the output end of the rectifier circuit, the output end of the switching power supply circuit is connected to the power supply end of the motor drive circuit, and the switching power supply circuit is used to convert the DC power supply into a first power supply and output it to power the motor drive circuit;

[0021] A voltage stabilizing circuit, wherein the input end of the voltage stabilizing circuit is connected to the output end of the switching power supply circuit, and the output end of the voltage stabilizing circuit is connected to the power supply end of the control circuit. The voltage stabilizing circuit is used to convert the first power supply into a second power supply and output it to power the control circuit.

[0022] In one embodiment, the DC motor assembly of the fixed-speed air conditioner outdoor unit further includes:

[0023] A bus voltage sampling circuit is electrically connected to the power module, and is used to detect the DC bus voltage and output a corresponding voltage detection signal to the drive module, so that the drive module drives the DC motor to work / stop working according to the voltage detection signal.

[0024] In one embodiment, the DC motor assembly of the fixed-speed air conditioner outdoor unit further includes:

[0025] A current sampling circuit is electrically connected to the driving module. The current sampling circuit is used to detect the output current of the driving module and output a corresponding current detection signal to the driving module, so that the driving module drives the DC motor to work / stop working according to the current detection signal.

[0026] In one embodiment, the DC motor assembly of the fixed-speed air conditioner outdoor unit further includes:

[0027] A temperature sampling circuit is electrically connected to the driving module. The temperature sampling circuit is used to detect the operating temperature of the DC motor body and output a corresponding temperature detection signal to the driving module, so that the driving module drives the DC motor to start / stop working according to the temperature detection signal.

[0028] The present application also proposes a constant-speed air-conditioning outdoor unit, which includes the above-mentioned DC motor component of the constant-speed air-conditioning outdoor unit. Beneficial effects

[0029] In the technical solution of the present application, a DC motor is used to replace the AC motor in the existing air-conditioning outdoor unit, and the DC motor is driven to work at a predetermined speed, so that the external power supply fluctuation will not affect the operation of the motor at the set speed, thereby improving the stability of the fixed-speed air-conditioning outdoor unit. Moreover, since it is a DC motor body, the efficiency is completely equivalent to the efficiency of the variable-frequency motor or even higher, thereby greatly improving the efficiency of the motor. In addition, although the material cost of the power module and drive module of the newly designed fixed-speed DC motor is equivalent to or slightly higher than that of the AC motor, due to the significant improvement in motor efficiency, the input power drops significantly, driving down the cost of related materials such as the evaporator, condenser and compressor, thereby significantly reducing the overall cost of the entire machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0031] FIG1 is a functional module diagram of an embodiment of a DC motor assembly of a fixed-speed air conditioner outdoor unit of the present application;

[0032] FIG2 is a functional module diagram of another embodiment of a DC motor assembly of a fixed-speed air conditioner outdoor unit of the present application;

[0033] FIG3 is a circuit diagram of an embodiment of a motor drive circuit for a fixed-speed air conditioner outdoor unit of the present invention;

[0034] FIG4 is a circuit diagram of an embodiment of a control circuit for a fixed-speed air conditioner outdoor unit according to the present invention;

[0035] FIG5 is a circuit diagram of an embodiment of a rectifier circuit of a fixed-speed air conditioner outdoor unit of the present application;

[0036] FIG6 is a circuit diagram of an embodiment of a switching power supply circuit of a fixed-speed air conditioner outdoor unit of the present application;

[0037] FIG7 is a circuit diagram of an embodiment of a voltage stabilizing circuit for a fixed-speed air conditioner outdoor unit of the present invention;

[0038] FIG8 is a circuit diagram of an embodiment of a bus voltage sampling circuit for a fixed-speed air conditioner outdoor unit of the present invention;

[0039] FIG9 is a circuit diagram of an embodiment of a current sampling circuit for a fixed-speed air conditioner outdoor unit of the present invention;

[0040] FIG10 is a schematic diagram of the circuit structure of an embodiment of an overcurrent protection circuit of an outdoor unit of a constant-speed air conditioner according to the present application.

[0041] Description of Figure Numbers:

[0042] Reference number name Reference number name 10 drive module 11 motor drive circuit 20 power module 12 control circuit 30 bus voltage sampling circuit 21 rectifier circuit 40 current sampling circuit 22 switching power supply circuit 50 temperature sampling circuit 23 voltage stabilizing circuit

[0043] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. Modes for Carrying Out the Invention

[0044] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0045] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), such directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0046] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0047] Currently, most fixed-speed air conditioner outdoor units do not have an electronic control panel. Therefore, their outdoor fan motors are typically AC asynchronous motors, with the neutral and live wires of the AC power supply connected directly to the AC motor terminals. However, the current technical solution of using AC asynchronous motors for fixed-speed outdoor motors has the following main drawbacks:

[0048] 1. Unstable speed and temperature rise - The speed of the AC motor has no closed-loop control and is easily affected by the fluctuation of the mains power. At the same time, the instability of the mains power can easily cause the temperature rise of the motor to exceed the tolerance, causing the protector to operate and the machine to trip.

[0049] 2. Low efficiency: Due to the torque curve characteristics of single-phase asynchronous AC motors, the high-efficiency speed range of AC motors is very narrow, and the maximum efficiency is limited. Generally, the maximum efficiency of 50HZ motors is 50%-65%, and the maximum efficiency of 60HZ motors is 40%-55%. In addition, the maximum speed is affected by the slip rate of the AC motor and is generally set within 900rpm. Therefore, the overall energy efficiency of the machine is greatly affected by the input power and speed of the AC motor.

[0050] 3. High cost: To meet the energy efficiency requirements of fixed-speed air conditioners, especially in the Middle East, the number of evaporator rows and AC motor materials used in fixed-speed air conditioners are very high.

[0051] To solve the above problems, the present application proposes a DC motor assembly for a fixed-speed air conditioner outdoor unit. Referring to FIG. 1 to FIG. 3 , in one embodiment, the DC motor assembly for the fixed-speed air conditioner outdoor unit includes:

[0052] DC motor body;

[0053] An input interface, used to connect to the mains electricity to supply power to the DC motor body;

[0054] A power module 20, the input end of which is connected to the input interface, and the power module 20 is used to convert the incoming mains power into a DC power supply for output;

[0055] The driving module 10 has a power input terminal connected to the output terminal of the power module 20, and the output terminal of the driving module 10 is connected to the DC motor. The driving module 10 is used to convert the DC power supply into a driving power supply and output it to the DC motor body to drive the DC motor body to operate at a predetermined speed.

[0056] In one embodiment, the DC motor can be a permanent magnet DC motor, a separately excited DC motor, or a self-excited DC motor, and is used to convert electrical energy into mechanical energy to drive the fan in the fixed-speed air conditioner outdoor unit to rotate. The DC motor body can be composed of a housing, an end cover, a stator, a rotor, a rotating shaft, and other parts. The housing and the end cover can be fixedly installed by screws, clips, or slots, thereby forming the motor shell and forming a housing cavity inside for accommodating the motor's stator, rotor, and rotating shaft. When current passes through the rotor to generate a magnetic field, which interacts with the stator's magnetic field, torque is generated, causing the motor to rotate. By controlling the magnitude and direction of the rotor current, the speed and direction of the DC motor can be controlled. The drive module 10 can be composed of a motor drive circuit 11 and a control circuit 12 for controlling the motor drive circuit 11. The motor drive circuit 11 can, based on the control of the control circuit 12, convert the DC power output by the power module 20 into a drive power and output it to the DC motor body to drive the DC motor to work, thereby converting the DC motor's electrical energy into mechanical energy to drive the fan in the fixed-speed air conditioner outdoor unit to rotate. The power module 20 may be composed of a rectifier circuit 21. The power module 20 can convert the incoming AC mains power into a DC power supply and output it to the driver module 10. In addition, the power module 20 may also be provided with a corresponding power supply circuit such as a DC-DC conversion circuit or an LDO voltage regulator circuit 23 to convert the DC power supply into a lower voltage power supply to power the IPM module or MCU in the driver module 10.

[0057] It is worth noting that, in one embodiment, the drive module 10 is configured to drive the DC motor body to operate at a predetermined speed. That is, the DC motor rotates at a predetermined speed, i.e., operates at a constant speed. The predetermined speed can be set based on the energy efficiency of the air conditioner or user needs. It is understood that setting the DC motor to operate at a constant speed prevents the DC motor's speed from being affected by fluctuations in the external power supply, thereby improving the stability of the fixed-speed air conditioner outdoor unit.

[0058] In the technical solution of the present application, a DC motor is used to replace the AC motor in the existing air-conditioning outdoor unit, and the DC motor is driven to work at a predetermined speed, so that external power supply fluctuations will not affect the operation of the motor at the set speed, thereby improving the stability of the fixed-speed air-conditioning outdoor unit. Moreover, since it is a DC motor body, the efficiency is completely equivalent to or even higher than the efficiency of the variable-frequency motor, thereby greatly improving the efficiency of the motor. In addition, although the material cost of the power module 20 and the drive module 10 of the newly designed fixed-speed DC motor is equivalent to or slightly higher than that of the AC motor, due to the significant improvement in motor efficiency, the input power is significantly reduced, which drives down the cost of related materials such as the evaporator, condenser and compressor, thereby significantly reducing the overall cost of the entire machine.

[0059] 1 to 3 , in one embodiment, the driving module 10 and the power module 20 are integrated into the DC motor body.

[0060] It is understandable that the outdoor fan motors in existing fixed-speed air conditioner outdoor units are basically AC asynchronous motors. The AC power supply neutral and live wires are directly connected to the AC motor terminals, and the AC mains directly provides driving power to drive the AC motor. Therefore, existing fixed-speed air conditioner outdoor units are not equipped with electronic control boards, which also makes the AC motor speed have no closed-loop control and is easily affected by the fluctuation of the mains power.

[0061] In one embodiment, if the AC motor is replaced with a DC motor, an electronic control unit is required to control the speed of the DC motor, ensuring constant speed rotation. Therefore, the driver module 10 and power module 20 can be integrated into the DC motor itself, meaning that there is no external electronic control unit on the DC motor. This eliminates the need for an electronic control board for the fixed-speed air conditioner outdoor unit. It is understood that when the driver module 10 and power module 20 are integrated within the DC motor, the DC motor's input terminals can be connected to the mains power supply as an input interface. The driver module 10 and power module 20 within the motor then convert the mains power into a driving power source to drive the motor. With this configuration, with the power module 20, driver module 10, and motor body integrated within the motor, a direct connection to an external power source allows for stable and efficient operation at a set speed. This achieves the same energy efficiency and speed as a variable-frequency DC motor, while also enabling operation without external electronic control. This significantly improves the energy efficiency, overall cost, and product competitiveness of fixed-speed models. In addition, the AC motor used in the existing fixed-speed air-conditioning outdoor unit is more prone to generating double-frequency noise and electromagnetic noise problems due to the harmonic interference of the mains power and the limitations of its own electromagnetic solution, especially the 60HZ model. The present application replaces the AC motor with a DC motor and integrates the power module 20 and the drive module 10 into the DC motor, which can reduce interference such as harmonics of the mains power, especially the inherent peak noise such as the double frequency of the AC motor can be completely solved.

[0062] In one embodiment, the DC motor body includes a housing and an end cover matched with the housing, wherein the end cover and the housing are matched to form a receiving cavity;

[0063] The driving module 10 and the power module 20 are disposed on a surface of the end cover close to the housing.

[0064] In one embodiment, the housing of the DC motor can be divided into two parts: a housing and an end cover. The housing and the end cover can be fixedly installed by means of screws, clips, or slots, thereby forming the housing of the motor and forming a housing cavity inside for accommodating the stator, rotor, and shaft of the motor. The drive module 10 and the power module 20 are arranged on the side surface of the end cover close to the housing, that is, on the inner surface of the end cover. In this arrangement, the power module 20 and the drive module 10 are arranged in the motor housing, so that the motor can be directly connected to the neutral and live wires of the external power supply to operate stably and efficiently at the set speed. It can achieve the same energy efficiency and speed as the variable frequency DC motor, and can also achieve the effect of power operation without external electronic control, greatly improving the energy efficiency, overall cost and product competitiveness of the fixed speed model. In addition, the AC motor used in the existing fixed-speed air-conditioning outdoor unit is more prone to generating double-frequency noise and electromagnetic noise problems due to the harmonic interference of the mains power and the limitations of its own electromagnetic solution, especially the 60HZ model. The present application replaces the AC motor with a DC motor and integrates the power module 20 and the drive module 10 into the DC motor, which can reduce interference such as harmonics of the mains power, especially the inherent peak noise such as the double frequency of the AC motor can be completely solved.

[0065] 1 to 3 , in one embodiment, the driving module 10 further has a first power supply terminal and a second power supply terminal;

[0066] The first power supply output end of the power supply module 20 is connected to the first power supply end of the driving module 10, and the second power supply output end of the power supply module 20 is connected to the second power supply end of the driving module 10. The power supply module 20 is also used to convert the connected mains power into a first power supply and output it from the first power supply output end, and convert the connected mains power into a second power supply and output it from the second power supply output end to power the driving module 10.

[0067] In one embodiment, the power module 20 not only provides a DC power supply for the driving module 10, but also provides a first power supply and a second power supply for the driving module 10. The power module 20 can be composed of a rectifier circuit 21, a DC-DC conversion circuit and a voltage stabilizing circuit 23, etc., wherein the rectifier circuit 21 is used to provide a DC power supply for the driving module 10, so that the inverter part in the driving module 10 converts the DC power supply into a driving power supply to drive the motor to work, and the DC-DC conversion circuit and the voltage stabilizing circuit 23 are used to convert the DC power supply into the first power supply and the second power supply to provide working power for the IPM module or MCU and other parts in the driving module 10, so that the driving module 10 can drive the motor to work.

[0068] 1 to 3 , in one embodiment, the driving module 10 includes:

[0069] a motor drive circuit 11, wherein the input end of the motor drive circuit 11 is connected to the output end of the power module 20, and the motor drive circuit 11 is used to convert the DC power supply into a drive power supply and output it to the DC motor body, so as to drive the DC motor body to operate at a predetermined speed;

[0070] The control circuit 12 has a control end connected to a controlled end of the motor drive circuit 11. The control circuit 12 is used to control the motor drive circuit 11 to convert the DC power supply into a drive power supply and output it to the DC motor, so as to drive the DC motor body to operate at a predetermined speed.

[0071] In one embodiment, the motor drive circuit 11 can be composed of an IPM module or an inverter circuit, etc., and is used to convert DC power into drive power and output it to the DC motor to drive the motor. The control circuit 12 can be implemented by a microprocessor such as a CPLD, FPGA, or MCU. The control circuit 12 is used to output corresponding control signals to control the operation of the motor drive circuit 11. It is understood that the control circuit 12 can output a specific PWM signal based on actual application requirements, thereby controlling the motor drive circuit 11 to output a fixed drive power, thereby driving the motor to operate at a predetermined speed. Referring to Figures 3 and 4, Figure 3 is a schematic circuit structure diagram of one embodiment of the motor drive circuit. The motor drive circuit 11 is composed of an IPM chip and is used to convert DC power into drive power and output it to the DC motor to drive the motor. Figure 4 is a schematic circuit structure diagram of one embodiment of the control circuit 12. The control circuit 12 is composed of an MCU and peripheral circuits and is used to output corresponding PWM control signals to control the operation of the motor drive circuit 11.

[0072] In one embodiment, the power module 20 includes:

[0073] A rectifier circuit 21, the input end of which is connected to the input interface, and the rectifier circuit 21 is used to convert the incoming AC mains power into a DC power supply for output;

[0074] a switching power supply circuit 22, wherein the input end of the switching power supply circuit 22 is connected to the output end of the rectifier circuit 21, and the output end of the switching power supply circuit 22 is connected to the power supply end of the motor drive circuit 11, and the switching power supply circuit 22 is used to convert the DC power supply into a first power supply and output it to power the motor drive circuit 11;

[0075] A voltage stabilizing circuit 23, wherein the input end of the voltage stabilizing circuit 23 is connected to the output end of the switching power supply circuit 22, and the output end of the voltage stabilizing circuit 23 is connected to the power supply end of the control circuit 12. The voltage stabilizing circuit 23 is used to convert the first power supply into a second power supply and output it to power the control circuit 12.

[0076] In one embodiment, the rectifier circuit 21 is used to rectify the incoming AC mains power into a DC power supply, and output it to the motor drive circuit 11 and the switching power supply circuit 22. The switching power supply circuit 22 can be implemented by using a DC-DC conversion circuit and a buck circuit, etc. The switching power supply circuit 22 can convert the DC power output by the rectifier circuit 21 into a first power supply to power the motor drive circuit 11 of the drive module 10. The voltage stabilizing circuit 23 can be implemented by using an LDO chip, etc., and is used to convert the first power supply output by the switching power supply circuit 22 into a second power supply to power the control circuit 12 of the drive module 10. Referring to Figures 5 to 7, Figure 5 is a schematic diagram of the circuit structure of an embodiment of the rectifier circuit. The rectifier circuit 21 is composed of discrete components such as resistors, capacitors, and transformers, and is used to rectify the incoming AC 220V mains power into a DC 310V voltage, and output it to the switching power supply circuit 22. Figure 6 is a schematic diagram of the circuit structure of an embodiment of a switching power supply circuit. The switching power supply circuit 22 is composed of discrete components such as a switching power supply chip, capacitors, resistors, and diodes. It is used to convert the DC 310V output voltage of the rectifier circuit 21 into a DC 15V regulated output voltage, which provides the first power supply for the motor drive circuit 11 and the voltage regulator circuit 23 of the driver module 10. Figure 7 is a schematic diagram of the circuit structure of an embodiment of a voltage regulator circuit. The voltage regulator circuit 23 is implemented using an LDO voltage regulator chip. It is used to convert the DC 15V output voltage of the switching power supply circuit 22 into a 3.3V voltage to power the control circuit 12 of the driver module 10.

[0077] 1 to 3 , in one embodiment, the DC motor assembly of the fixed-speed air conditioner outdoor unit further includes:

[0078] The bus voltage sampling circuit 30 is electrically connected to the power module 20. The bus voltage sampling circuit 30 is used to detect the DC bus voltage and output a corresponding voltage detection signal to the drive module 10, so that the drive module 10 drives the DC motor to work / stop working according to the voltage detection signal.

[0079] In one embodiment, the bus voltage sampling circuit 30 can use a resistor divider or a series resistor to implement voltage acquisition. The bus voltage sampling circuit 30 can acquire the DC bus voltage and output a corresponding voltage detection signal to the control circuit 12 in the driver module 10, so that the driver module 10 can determine the bus voltage and drive the DC motor to operate or stop according to the bus voltage to implement functions such as overvoltage protection or undervoltage protection. For example, when the driver module 10 determines through the voltage detection signal that the bus voltage is greater than 420V and lasts for two milliseconds, the DC motor is driven to stop working to implement overvoltage protection. Alternatively, when the driver module 10 determines through the voltage detection signal that the bus voltage is less than 100V and lasts for two milliseconds, the DC motor is driven to stop working to implement undervoltage protection. Referring to Figure 8, Figure 8 is a circuit structure diagram of an embodiment of a bus voltage sampling circuit. The bus voltage sampling circuit 30 uses resistor voltage division to realize voltage acquisition. After the bus voltage sampling circuit uses resistor voltage division, the corresponding voltage detection signal is output to the control circuit 12 in the drive module 10, so that the drive module 10 can determine the bus voltage size, thereby driving the DC motor to work or stop working according to the bus voltage, so as to realize functions such as overvoltage protection or undervoltage protection.

[0080] 1 to 3 , in one embodiment, the DC motor assembly of the fixed-speed air conditioner outdoor unit further includes:

[0081] The current sampling circuit 40 is electrically connected to the driving module 10. The current sampling circuit 40 is used to detect the output current of the driving module 10 and output a corresponding current detection signal to the driving module 10, so that the driving module 10 drives the DC motor to start / stop working according to the current detection signal.

[0082] In one embodiment, the current sampling circuit 40 can use a current sensor or the like to implement current acquisition. The current sampling circuit 40 can acquire the output current of the driver module 10 and output a corresponding current detection signal to the control circuit 12 in the driver module 10, so that the driver module 10 can determine the magnitude of the output current, thereby driving the DC motor to operate or stop working according to the magnitude of the output current, thereby implementing functions such as current limiting protection or overcurrent protection. For example, when the driver module 10 determines through the current detection signal that the output current is greater than 1.04A and lasts for 10 milliseconds, the DC motor is driven to stop working to implement overcurrent protection. Referring to Figures 9 and 10, Figure 9 is a schematic diagram of the circuit structure of an embodiment of the current sampling circuit, and Figure 10 is a schematic diagram of the circuit structure of an embodiment of the overcurrent protection circuit. The current sampling circuit 40 uses a resistor divider to acquire voltage, and determines the corresponding current magnitude based on the acquired voltage magnitude to achieve current acquisition. Through the overcurrent protection circuit, the DC motor is driven to operate or stop working according to the magnitude of the output current, thereby implementing functions such as current limiting protection or overcurrent protection.

[0083] 1 and 2 , in one embodiment, the DC motor assembly of the fixed-speed air conditioner outdoor unit further includes:

[0084] The temperature sampling circuit 50 is electrically connected to the driving module 10. The temperature sampling circuit 50 is used to detect the operating temperature of the DC motor body and output a corresponding temperature detection signal to the driving module 10, so that the driving module 10 drives the DC motor to start / stop working according to the temperature detection signal.

[0085] In one embodiment, the temperature sampling circuit 50 can utilize a temperature sensor or the like to acquire temperature. The temperature sampling circuit 50 can acquire the operating temperature of the DC motor body and output a corresponding temperature detection signal to the control circuit 12 in the driver module 10, enabling the driver module 10 to determine the operating temperature and thereby drive or stop the DC motor based on the operating temperature to implement functions such as temperature protection. For example, if the driver module 10 determines, based on the current detection signal, that the operating temperature of the DC motor body is greater than 105°C and persists for 1 second, the DC motor is driven to stop operating to implement over-temperature protection.

[0086] The present application also proposes a constant-speed air-conditioning outdoor unit, which includes the DC motor assembly of the above-mentioned constant-speed air-conditioning outdoor unit. The specific structure of the DC motor assembly of the constant-speed air-conditioning outdoor unit refers to the above-mentioned embodiment. Since this constant-speed air-conditioning outdoor unit adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the effects brought about by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0087] The above description is merely an optional embodiment of the present application and does not limit the patent scope of the present application. All equivalent structural transformations made using the contents of the present application specification and drawings under the inventive concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A DC motor assembly for a constant speed air conditioner outdoor unit, wherein: The DC motor assembly of the fixed speed air conditioner outdoor unit comprises: DC motor body; Input interface, used to access the mains power; A power supply module, the input end of which is connected to the input interface, and the power supply module is used to convert the connected mains power into a DC power supply for output; A driving module, wherein the power input end of the driving module is connected to the output end of the power module, and the output end of the driving module is connected to the DC motor. The driving module is used to convert the DC power supply into a driving power supply and then output it to the DC motor body to drive the DC motor body to operate at a predetermined speed.

2. The DC motor assembly of the fixed speed air conditioner outdoor unit according to claim 1, wherein: The driving module and the power supply module are integrated in the DC motor body.

3. The DC motor assembly of the fixed speed air conditioner outdoor unit according to claim 2, wherein: The DC motor body comprises a housing and an end cover matched with the housing, wherein the end cover matches with the housing to form a receiving cavity; The driving module and the power supply module are arranged on a side surface of the end cover close to the housing.

4. The DC motor assembly of the fixed speed air conditioner outdoor unit according to claim 1, wherein: The driving module also has a first power supply end and a second power supply end; The first power supply output end of the power supply module is connected to the first power supply end of the driving module, and the second power supply output end of the power supply module is connected to the second power supply end of the driving module. The power supply module is also used to convert the connected AC power into a first power supply and output it from the first power supply output end, and convert the connected AC power into a second power supply and output it from the second power supply output end to power the driving module.

5. The DC motor assembly of the fixed speed air conditioner outdoor unit according to claim 1, wherein: The driving module comprises: A motor drive circuit, wherein the input end of the motor drive circuit is connected to the output end of the power module, and the motor drive circuit is used to convert the DC power supply into a drive power supply and then output it to the DC motor body, so as to drive the DC motor body to work at a predetermined speed; A control circuit, wherein the control end of the control circuit is connected to the controlled end of the motor drive circuit, and the control circuit is used to control the motor drive circuit to convert the DC power supply into a drive power supply and output it to the DC motor, so as to drive the DC motor body to operate at a predetermined speed.

6. The DC motor assembly of the fixed speed air conditioner outdoor unit according to claim 5, wherein: The power module comprises: A rectifier circuit, the input end of which is connected to the input interface, and the rectifier circuit is used to convert the connected AC mains power into a DC power supply for output; A switching power supply circuit, wherein the input end of the switching power supply circuit is connected to the output end of the rectifier circuit, the output end of the switching power supply circuit is connected to the power supply end of the motor drive circuit, and the switching power supply circuit is used to convert the DC power supply into a first power supply and then output it to power the motor drive circuit; A voltage stabilizing circuit, wherein the input end of the voltage stabilizing circuit is connected to the output end of the switching power supply circuit, the output end of the voltage stabilizing circuit is connected to the power supply end of the control circuit, and the voltage stabilizing circuit is used to convert the first power supply into a second power supply and then output it to power the control circuit.

7. The DC motor assembly of the fixed speed air conditioner outdoor unit according to claim 1, wherein: The DC motor assembly of the fixed speed air conditioner outdoor unit also includes: A bus voltage sampling circuit, the bus voltage sampling circuit is electrically connected to the power module, and the bus voltage sampling circuit is used to detect the DC bus voltage and output a corresponding voltage detection signal to the drive module, so that the drive module drives the DC motor to work / stop working according to the voltage detection signal.

8. The DC motor assembly of the fixed speed air conditioner outdoor unit according to claim 1, wherein: The DC motor assembly of the fixed speed air conditioner outdoor unit also includes: A current sampling circuit is electrically connected to the driving module, and is used to detect the output current of the driving module and output a corresponding current detection signal to the driving module, so that the driving module drives the DC motor to work / stop working according to the current detection signal.

9. The DC motor assembly of the fixed speed air conditioner outdoor unit according to claim 1, wherein: The DC motor assembly of the fixed speed air conditioner outdoor unit also includes: A temperature sampling circuit is electrically connected to the driving module. The temperature sampling circuit is used to detect the operating temperature of the DC motor body and output a corresponding temperature detection signal to the driving module so that the driving module drives the DC motor to work / stop working according to the temperature detection signal.

10. A constant speed air conditioner outdoor unit, wherein: The fixed-speed air-conditioning outdoor unit comprises a DC motor assembly of a fixed-speed air-conditioning outdoor unit as described in any one of claims 1-9.

Images