Motor controller, motor and control method thereof

Abstract

The present invention provides a motor controller, a motor, and a control method thereof. The motor controller includes an electrical box, a control board, a PFC inductor, an insulating frame, and a cooling device. The electrical box has a receiving chamber, the control board covers the open end of the receiving chamber, the insulating frame is located in the receiving chamber, the PFC inductor is located on the insulating frame and is electrically connected to the control board, and the cooling device is located in the receiving chamber. The cooling device includes a circulating pump, a temperature sensor, and a cooling pipe. The circulating pump is electrically connected to the control board, and a first end of the circulating pump is used to communicate with a coolant tank, a second end of the circulating pump is connected to the cooling pipe, and the temperature sensor is disposed in the cooling pipe and is electrically connected to the control board. The motor controller of the present invention can achieve the purpose of reducing the overall size of the motor, saving installation space, and reducing production costs, and enhances the heat dissipation effect of the PFC inductor and the interior of the electrical box. It can also monitor the operating temperature in real time and improve the working efficiency of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a motor controller, a motor having the controller, and a control method for the motor. Background Art

[0002] With the advancement of ventilation technology, the demand for intelligent and energy-efficient industrial ventilation is increasing. With the introduction of new energy efficiency requirements, traditional AC motors are gradually being replaced by energy-saving, efficient, and intelligently integrated brushless DC motors. While brushless DC motors are significantly replacing traditional AC motors, the market is also placing more stringent lifespan requirements on them.

[0003] A brushless DC motor, consisting of a motor and a controller, is a typical mechatronic product. The controller generates a significant amount of heat during operation, primarily from components such as the inductor, capacitors, and power transistors. If this heat cannot be dissipated promptly, it will accumulate inside the controller housing, impacting the motor controller's performance and shortening its lifespan, ultimately affecting the lifespan of the motor.

[0004] At present, the PFC inductor (power factor correction inductor) of the brushless DC motor is installed externally on the motor body. The PFC inductor needs to be fixed at the same time as it is installed. This installation method greatly increases the size and cost of the motor. At the same time, the large amount of heat generated by the PFC inductor during operation cannot be dissipated in a timely and effective manner, and there is a lack of real-time monitoring, which seriously restricts the working efficiency of the motor. Summary of the Invention

[0005] The first object of the present invention is to provide a motor controller that integrates the PFC inductor into the electrical box, thereby reducing the size of the entire motor, saving installation space, and lowering production costs, and effectively enhancing the heat dissipation effect of the PFC inductor and the inside of the electrical box, and being able to monitor the operating temperature of the motor controller in real time, thereby improving the working efficiency of the motor.

[0006] A second object of the present invention is to provide a motor having the above motor controller.

[0007] A third object of the present invention is to provide a control method for the above motor.

[0008] In order to achieve the first object of the present invention, the present invention provides a motor controller, including an electrical box, a control board, a PFC inductor, an insulating frame and a cooling device, the electrical box is provided with a accommodating cavity, the control board covers the open end of the accommodating cavity, the insulating frame is located in the accommodating cavity, the PFC inductor is located on the insulating frame and is electrically connected to the control board, the cooling device is located in the accommodating cavity, the cooling device includes a circulating pump, a temperature sensor and a cooling pipe, the circulating pump is electrically connected to the control board, and the first end of the circulating pump is used to communicate with the coolant tank, the second end of the circulating pump is connected to the cooling pipe, and the temperature sensor is arranged in the cooling pipe and is electrically connected to the control board.

[0009] As can be seen from the above scheme, the motor controller of the present invention installs the PFC inductor into the accommodating cavity of the electrical box through an insulating frame. Compared with the existing PFC inductor which is installed externally on the motor body, the present invention integrates the PFC inductor into the electrical box of the motor controller, which can effectively achieve the purpose of reducing the volume of the entire motor, saving installation space, and reducing production costs. In addition, the insulating frame insulates the PFC inductor from the electrical box, avoiding contact between the PFC inductor and the electrical box to form a conduction and cause electric shock safety accidents, thereby improving the safety of the motor controller. At the same time, the motor controller of the present invention is provided with a cooling device in the electrical box. The control board controls the operation of the circulating pump of the cooling device, so that the coolant circulates in the cooling pipe, which can effectively and quickly remove the heat of the PFC inductor and the internal heat of the electrical box, thereby enhancing the heat dissipation effect of the PFC inductor, greatly improving the heat dissipation efficiency and reducing the temperature in the electrical box, thereby improving the working efficiency of the motor. Furthermore, a temperature sensor installed within the cooling tube monitors the temperature within the cooling tube in real time, reflecting the operating temperature within the electrical enclosure. When the temperature detected by the temperature sensor exceeds a preset temperature, the control board activates the circulating pump. When the temperature detected by the temperature sensor falls below the preset temperature, the circulating pump stops, effectively conserving energy and achieving optimal control of power consumption and cooling effectiveness. Therefore, the motor controller of the present invention addresses the issues of existing motors with external PFC inductors, which increase costs, poor space utilization within the electrical enclosure, and high operating temperatures of the PFC inductor.

[0010] A preferred solution is that a fixing groove is provided in the accommodating cavity, the insulating frame and the PFC inductor are located in the fixing groove, and the PFC inductor is potted in the fixing groove by an electrically insulating and thermally conductive potting compound.

[0011] A further solution is that the cooling pipe includes a first branch pipe, and the first branch pipe is located on a side of the PFC inductor away from the control board.

[0012] A further solution is that the control board is provided with a capacitor, the capacitor is located in the accommodating cavity, the cooling pipe includes a second branch pipe, and the second branch pipe is located on a side of the capacitor away from the control board.

[0013] A further solution is to provide an electrically insulating and heat-conducting patch in the accommodating cavity, and the patch is located on a side of the capacitor away from the control board.

[0014] A further solution is that a power device electrically connected to the control board is provided in the accommodating cavity, and a gap between the power device and the inner wall of the accommodating cavity is filled with thermal conductive glue.

[0015] A further solution is that a first fin structure is provided on an outer end surface of the electrical box away from the control panel; and / or a second fin structure is provided on an outer peripheral surface of the electrical box.

[0016] A further solution is that the first fin structure is formed with a first ︺-type heat dissipation gap and a second ︺-type heat dissipation gap, and the first ︺-type heat dissipation gap and the second ︺-type heat dissipation gap are arranged in a mirror image.

[0017] A further solution is that the first fin structure further forms a first V-shaped heat dissipation gap and a second V-shaped heat dissipation gap, and the first V-shaped heat dissipation gap and the second V-shaped heat dissipation gap are arranged in a mirror image.

[0018] A further solution is that the first fin structure also forms a first strip-shaped heat dissipation gap and a second strip-shaped heat dissipation gap, the first strip-shaped heat dissipation gap is located on a side of the first ︺-type heat dissipation gap away from the second ︺-type heat dissipation gap, and the second strip-shaped heat dissipation gap is located on a side of the second ︺-type heat dissipation gap away from the first ︺-type heat dissipation gap.

[0019] A further solution is that the second fin structure is formed with an axial heat dissipation gap connected to the heat dissipation gap formed by the first fin structure, and the axial heat dissipation gap extends from the outer end surface of the electrical box to the open end.

[0020] In order to achieve the second object of the present invention, the present invention provides a motor, including a motor controller, which is the above-mentioned motor controller.

[0021] In order to achieve the third purpose of the present invention, the present invention provides a motor control method, the motor is the above-mentioned motor, and the control method includes: determining whether the operating temperature obtained by the temperature sensor of the motor controller is greater than the first preset temperature; if so, turning on the circulation pump of the motor controller.

[0022] A further solution is to determine whether the operating temperature is between the first preset temperature and the second preset temperature. If so, the circulation pump operates at a first preset power; the first preset power is a first preset multiple of the rated power of the circulation pump, and the second preset temperature is greater than the first preset temperature.

[0023] A further solution is to determine whether the operating temperature is between the second preset temperature and the third preset temperature. If so, the circulating pump operates at a second preset power; the second preset power is a second preset multiple of the rated power of the circulating pump, the third preset temperature is greater than the second preset temperature, and the second preset multiple is greater than the first preset multiple.

[0024] A further solution is to determine whether the operating temperature is between the third preset temperature and the limit preset temperature. If so, the circulating pump operates at the second preset power, and the limit preset temperature is greater than the third preset temperature; and determine whether the operating temperature greater than the third preset temperature continues for more than a preset time. If so, the operating power of the motor is adjusted to a third preset multiple of the rated power of the motor, and the third preset multiple is less than 1.

[0025] A further solution is that the first preset temperature is 0.7 times the limit preset temperature; and / or, the second preset temperature is 0.8 times the limit preset temperature; and / or, the third preset temperature is 0.9 times the limit preset temperature.

[0026] A further solution is to set the preset time to ten minutes. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a front view of an embodiment of a motor controller of the present invention.

[0028] Figure 2 1 is a structural diagram of a control board in an embodiment of a motor controller of the present invention.

[0029] Figure 3 It is a front view of the local structure of an embodiment of a motor controller of the present invention.

[0030] Figure 4 It is a partial structural sectional view of an embodiment of a motor controller of the present invention.

[0031] Figure 5 It is a partial structural stereogram of an embodiment of a motor controller of the present invention.

[0032] Figure 6 1 is a structural diagram of a cooling device in an embodiment of a motor controller of the present invention.

[0033] Figure 7 It is a cross-sectional view of the cooperation between the electrical box and the cooling device in the embodiment of the motor controller of the present invention.

[0034] Figure 8 This is a first-view structural diagram of the electrical box in an embodiment of the motor controller of the present invention.

[0035] Figure 9 This is a structural diagram of the electrical box from a second perspective in an embodiment of the motor controller of the present invention.

[0036] Figure 10 It is a front view of the electrical box in the motor controller embodiment of the present invention.

[0037] Figure 11 It is a cross-sectional view of an electrical box in an embodiment of a motor controller of the present invention.

[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0039] Motor controller example:

[0040] See also Figures 1 to 7 This embodiment discloses a motor controller 1, comprising an electrical box 11, a control board 12, a PFC inductor 18, an insulating frame 19, and a cooling device. The electrical box 11 defines a housing chamber 111, and the control board 12 covers the open end 112 of the housing chamber 111. The insulating frame 19 is located within the housing chamber 111, and the PFC inductor 18 is located on the insulating frame 19 and electrically connected to the control board 12. The cooling device is located within the housing chamber 111 and includes a circulating pump 15, a temperature sensor (not shown), and a cooling pipe 16. The circulating pump 15 is electrically connected to the control board 12, with a first end of the circulating pump 15 communicating with an external coolant tank (not shown). A second end of the circulating pump 15 communicates with the cooling pipe 16. The temperature sensor is disposed within the cooling pipe 16 and electrically connected to the control board 12. The cooling pipe 16 includes a first branch pipe 161 located on the side of the PFC inductor 18 away from the control board 12.

[0041] In this embodiment, the motor controller 1 installs the PFC inductor 18 into the accommodating cavity 111 of the electrical box 11 through the insulating frame 19. Compared with the existing PFC inductor that is externally installed on the motor body, this embodiment integrates the PFC inductor 18 into the electrical box 11 of the motor controller 1, which can effectively achieve the purpose of reducing the volume of the entire motor, saving installation space, and reducing production costs. In addition, the insulating frame 19 makes the PFC inductor 18 and the electrical box 11 in an electrically insulated state, avoiding contact and conduction between the PFC inductor 18 and the electrical box 11, thereby preventing electric shock safety accidents, thereby improving the safety of the motor controller 1. At the same time, the motor controller 1 of this embodiment is provided with a cooling device within the electrical box 11. The control board 12 controls the operation of the circulating pump 15 of the cooling device, causing the coolant to circulate within the cooling pipe 16. Since the cooling pipe 16 includes a first branch pipe 161, and the first branch pipe 161 is located on the side of the PFC inductor 18 away from the control board 12, the coolant flowing through the first branch pipe 161 can effectively and quickly remove the heat of the PFC inductor 18, thereby enhancing the heat dissipation effect of the PFC inductor 18, greatly improving the heat dissipation efficiency and reducing the temperature within the electrical box 11, thereby improving the operating efficiency of the motor. In addition, a temperature sensor provided within the cooling pipe 16 can monitor the temperature within the cooling pipe 16 in real time. This temperature reflects the operating temperature within the electrical box 11 in real time. When the temperature detected by the temperature sensor exceeds a preset temperature, the control board 12 controls the circulating pump 15 to start operating. When the temperature detected by the temperature sensor is lower than the preset temperature, the circulating pump 15 stops operating. This can effectively save energy, thereby achieving optimal control of power consumption and cooling effect. Therefore, the motor controller 1 of this embodiment can solve the problems of increased cost due to external PFC inductors in existing motors, poor space utilization inside the electrical box, and high operating temperature of the PFC inductors.

[0042] To further enhance the heat dissipation of the PFC inductor 18, a fixing slot 117 is provided within the housing cavity 111 of the electrical box 11 of this embodiment. The insulating frame 19 and the PFC inductor 18 are positioned within the fixing slot 117. The PFC inductor 18 is then potted within the fixing slot 117 using an electrically insulating and thermally conductive potting compound (not shown). This ensures that the PFC inductor 18 is electrically insulated from the electrical box 11 while being covered and potted within the fixing slot 117 by the potting compound. This ensures that the PFC inductor 18 is securely positioned within the electrical box 11 and dissipates heat. The output terminals of the PFC inductor 18 are electrically connected to the pin headers 14 on the control board 12, thereby enabling electrical signal transmission.

[0043] Among them, the control board 12 of the motor controller 1 of this embodiment is provided with a capacitor 13, and the capacitor 13 is located in the accommodating cavity 111 of the electrical box 11. The cooling pipe 16 also includes a second branch pipe 162, and the second branch pipe 162 is located on the side of the capacitor 13 away from the control board 12. The control board 12 is installed upside down at the open end 112 of the electrical box 11, so that the capacitor 13 is located in the accommodating cavity 111 of the electrical box 11. The coolant flowing through the second branch pipe 162 can effectively and quickly take away the working heat of the capacitor 13, enhance the heat dissipation effect of the capacitor 13, greatly improve the heat dissipation efficiency and reduce the temperature in the electrical box 11, and solve the problem that the existing capacitor is easy to heat up, causing capacitor failure and affecting the life of the motor, thereby improving the working efficiency of the motor and extending the life of the motor. In order to further enhance the heat dissipation effect of the capacitor 13, an electrically insulating and heat-conductive patch 3 is provided in the accommodating cavity 111. The patch 3 is located on the side of the capacitor 13 away from the control board 12, and the patch 3 then dissipates heat from the capacitor 13. Preferably, the side of the capacitor 13 away from the control board 12 contacts the patch 3, so that the patch 3 expels the air between the capacitor 13 and the bottom surface of the inner cavity of the accommodating cavity 111, better allowing the capacitor 13 to dissipate heat. At the same time, the space of the accommodating cavity 111 of the electrical box 11 is reasonably utilized. In addition, the patch 3 has an electrical insulating effect, so that the capacitor 13 and the electrical box 11 are in an electrically isolated state, thereby better preventing the capacitor 13 from short-circuiting. In order to limit the position of the patch 3 and thus improve the heat dissipation effect, a limiting groove 116 is provided on the bottom surface of the inner cavity of the accommodating cavity 111, and the patch 3 is located within the limiting groove 116.

[0044] In order to firmly fix the control board 12 on the open end 112 of the electrical box 11, a support column 113 can be provided in the accommodating cavity 111 of the electrical box 11, and a screw hole 114 is provided on the support column 113. At the same time, a through hole 121 corresponding to the position of the screw hole 114 is provided on the control board 12. The control board 12 is placed and supported on the support column 113, and the control board 12 and the electrical box 11 can be fixedly connected together by screws 2.

[0045] In addition, a power device 17 electrically connected to the control board 12 is disposed within the housing cavity 111 of the electrical box 11 of this embodiment. The gap between the power device 17 and the inner wall of the housing cavity 111 is filled with thermally conductive adhesive (not shown) to dissipate heat from the power device 17. Specifically, the power device 17 of this embodiment is an IPM intelligent power module, which is secured within the housing cavity 111 of the electrical box 11 using screws. The thermally conductive adhesive fills the gap between the IPM intelligent power module and the inner wall of the housing cavity 111, squeezing out air and enhancing the heat dissipation of the IPM intelligent power module.

[0046] In addition, in this embodiment, the outer end surface of the electrical box 11, away from the control board 12, is provided with a first fin structure, and the outer peripheral surface of the electrical box 11 is provided with a second fin structure. Heat removed from the PFC inductor 18 by the potting adhesive can be transferred to the outside air through the first and second fin structures for rapid heat dissipation. Heat removed from the capacitor 13 by the patch 3 can be transferred to the outside air through the first and second fin structures for rapid heat dissipation. Heat removed from the power device 17 by the thermally conductive adhesive can be transferred to the outside air through the first and second fin structures for rapid heat dissipation. This enhances the heat dissipation effect of the motor controller 1 and thus improves the motor's operating efficiency.

[0047] Because different components of the motor controller 1 have different heating capacities, the temperatures of various parts of the electrical box 11 are uneven. In this embodiment, the cooling tube 16 also includes a third branch tube (not shown) that surrounds the inner wall of the accommodating cavity 111, positioning the relevant heating components within the third branch tube. This effectively reduces the temperatures of the capacitor 13, PFC inductor 18, and power device 17, further improving the heat dissipation within the electrical box 11 and making the temperature uniform within the electrical box 11, thereby increasing the efficiency of the motor.

[0048] See also Figures 8 to 11 In this embodiment, the first fin structure on the outer end surface of the electrical box 11 is formed with a first ︺-shaped heat dissipation gap 118 and a second ︺-shaped heat dissipation gap 119, and the first ︺-shaped heat dissipation gap 118 and the second ︺-shaped heat dissipation gap 119 are arranged in a mirror image. At the same time, the first fin structure is also formed with a first V-shaped heat dissipation gap 1110 and a second V-shaped heat dissipation gap 1111, and the first V-shaped heat dissipation gap 1110 and the second V-shaped heat dissipation gap 1111 are arranged in a mirror image. In addition, the first fin structure is also formed with a first strip-shaped heat dissipation gap 1112 and a second strip-shaped heat dissipation gap 1113. The first strip-shaped heat dissipation gap 1112 is located on the side of the first ︺-shaped heat dissipation gap 118 away from the second ︺-shaped heat dissipation gap 119, and the second strip-shaped heat dissipation gap 1113 is located on the side of the second ︺-shaped heat dissipation gap 119 away from the first ︺-shaped heat dissipation gap 118. At the same time, the second fin structure of this embodiment forms an axial heat dissipation gap 1115 that is connected to the heat dissipation gap formed by the first fin structure. The axial heat dissipation gap 1115 extends from the outer end surface of the electrical box 11 to the open end 112.

[0049] The first ︺-shaped heat dissipation gap 118, the second ︺-shaped heat dissipation gap 119, the first V-shaped heat dissipation gap 1110, the second V-shaped heat dissipation gap 1111, the first strip heat dissipation gap 1112, the second strip heat dissipation gap 1113 and the axial heat dissipation gap 1115 are combined to form the external fin structure of the electrical box 11. The first ︺-shaped heat dissipation gap 118, the second ︺-shaped heat dissipation gap 119, the first V-shaped heat dissipation gap 1110, the second V-shaped heat dissipation gap 1111, the first strip heat dissipation gap 1112, the second strip heat dissipation gap 1113 and the axial heat dissipation gap 1115 have different shapes, thereby enhancing the disturbance ability of the airflow in the above-mentioned gaps, strengthening the heat exchange effect, and thus making the heat dissipation effect better, and the first fin structure dissipates heat evenly without forming heat accumulation.

[0050] In order to further enhance the heat dissipation effect of the power device 17, the bottom surface of the inner cavity of the accommodating cavity 111 of this embodiment is provided with a boss 115 protruding toward the open end 112 for mounting the power device 17, and the outer end surface of the electrical box 11 is provided with a notch groove (not marked) corresponding to the boss 115, and the first fin structure forms a third ︺-shaped heat dissipation gap 1114 in the notch groove.

[0051] Motor control method embodiment:

[0052] The motor control method of this embodiment is a motor control method having the above-mentioned motor controller 1, and the control method includes: determining whether the operating temperature T0 obtained by the temperature sensor of the motor controller 1 is greater than the first preset temperature T1, and if so, turning on the circulation pump 15 of the motor controller 1.

[0053] When the operating temperature T0 acquired by the temperature sensor is lower than the first preset temperature T1, it indicates that all the heating components of the motor controller 1 are in a good heat dissipation state, and the circulation pump 15 does not need to be turned on for coolant circulation.

[0054] When it is determined that the operating temperature T0 obtained by the temperature sensor is between the first preset temperature T1 and the second preset temperature T2, the circulation pump 15 operates at the first preset power P1, and the first preset power P1 is a first preset multiple of the rated power of the circulation pump 15. Preferably, in this embodiment, the first preset power P1 is 0.5 times the rated power of the circulation pump 15, and the second preset temperature T2 is greater than the first preset temperature T1.

[0055] When it is determined that the operating temperature T0 obtained by the temperature sensor is between the second preset temperature T2 and the third preset temperature T3, the circulation pump 15 operates at the second preset power P2, and the second preset power P2 is a second preset multiple of the rated power of the circulation pump 15, and the second preset multiple is greater than the first preset multiple. Preferably, in this embodiment, the second preset power P2 is 0.95 times the rated power of the circulation pump 15, and the third preset temperature T3 is greater than the second preset temperature T2.

[0056] When it is determined that the operating temperature T0 obtained by the temperature sensor is between the third preset temperature T3 and the limited preset temperature Ta, the circulating pump 15 operates at the second preset power P2, the limited preset temperature Ta is greater than the third preset temperature T3, and it is determined that the operating temperature T0 greater than the third preset temperature T3 continues for more than the preset time t. If so, the operating power P3 of the motor is adjusted to a third preset multiple of the rated power of the motor, and the third preset multiple is less than 1. Preferably, the operating power P3 of the motor in this embodiment is adjusted to 0.8 times the rated power of the motor. At the same time, the overtemperature signal can also be transmitted to the host computer, and the host computer can execute the motor shutdown or speed adjustment processing according to the needs; before the host computer issues an instruction, the motor continues to execute the stable 0.8 times rated power limit, thereby reducing the heating capacity of the heating component and extending the life of the motor.

[0057] The operating temperature of the power device 17 is generally 95°C, the operating temperature of the PFC inductor 18 is generally 105°C, and the operating temperature of the capacitor 13 is generally 85°C. To ensure that the temperature of the motor control system meets the operating requirements, the preset temperature Ta is limited to 85°C. The first preset temperature T1 is 0.7 times the preset temperature Ta, the second preset temperature T2 is 0.8 times the preset temperature Ta, and the third preset temperature T3 is 0.9 times the preset temperature Ta. Preferably, the preset time t in this embodiment is ten minutes.

[0058] The above embodiments are only preferred examples of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structure, features and principles of the patent application scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A motor controller comprising an electrical box and a control board, wherein the electrical box has a receiving cavity, and the control board covers the open end of the receiving cavity, characterized in that: The motor controller further includes a PFC inductor, an insulating frame, and a cooling device, wherein the insulating frame is located in the accommodating cavity, and the PFC inductor is located on the insulating frame and is electrically connected to the control board; The cooling device is located in the accommodating cavity, and includes a circulation pump, a temperature sensor, and a cooling pipe. The circulation pump is electrically connected to the control board, and a first end of the circulation pump is used to communicate with the coolant tank, and a second end of the circulation pump is connected to the cooling pipe. The temperature sensor is arranged in the cooling pipe and is electrically connected to the control board; A fixing groove is provided in the accommodating cavity, the insulating frame and the PFC inductor are located in the fixing groove, and the PFC inductor is potted in the fixing groove by an electrically insulating and thermally conductive potting compound; The cooling pipe includes a first branch pipe, and the first branch pipe is located on a side of the PFC inductor away from the control board.

2. The motor controller according to claim 1, wherein: The control board is provided with a capacitor, and the capacitor is located in the accommodating cavity; The cooling pipe includes a second branch pipe, and the second branch pipe is located on a side of the capacitor away from the control board.

3. The motor controller according to claim 2, wherein: An electrically insulating and heat-conductive patch is provided in the accommodating cavity, and the patch is located on a side of the capacitor away from the control board.

4. The motor controller according to claim 1, wherein: A power device electrically connected to the control board is arranged in the accommodating cavity, and a gap between the power device and the inner wall of the accommodating cavity is filled with thermal conductive glue.

5. The motor controller according to any one of claims 1 to 4, characterized in that: The outer end surface of the electrical box away from the control board is provided with a first fin structure; And / or, a second fin structure is provided on the outer peripheral surface of the electrical box.

6. The motor controller according to claim 5, characterized in that: The first fin structure is formed with a first ︺-shaped heat dissipation gap and a second ︺-shaped heat dissipation gap, and the first ︺-shaped heat dissipation gap and the second ︺-shaped heat dissipation gap are arranged in a mirror image.

7. The motor controller according to claim 5, characterized in that: The first fin structure further forms a first V-shaped heat dissipation gap and a second V-shaped heat dissipation gap, and the first V-shaped heat dissipation gap and the second V-shaped heat dissipation gap are arranged in a mirror image.

8. The motor controller according to claim 6, characterized in that: The first fin structure also forms a first strip-shaped heat dissipation gap and a second strip-shaped heat dissipation gap. The first strip-shaped heat dissipation gap is located on a side of the first ︺-shaped heat dissipation gap away from the second ︺-shaped heat dissipation gap, and the second strip-shaped heat dissipation gap is located on a side of the second ︺-shaped heat dissipation gap away from the first ︺-shaped heat dissipation gap.

9. The motor controller according to any one of claims 6 to 8, characterized in that: The second fin structure is formed with an axial heat dissipation gap that is connected to the heat dissipation gap formed by the first fin structure, and the axial heat dissipation gap extends from the outer end surface of the electrical box to the open end.

10. A motor, including a motor controller, characterized in that: The motor controller is the motor controller according to any one of claims 1 to 9.

11. A method for controlling a motor, characterized in that: The motor is the motor according to claim 10, and the control method includes: It is determined whether the operating temperature obtained by the temperature sensor of the motor controller is greater than a first preset temperature. If so, a circulation pump of the motor controller is turned on.

12. The control method according to claim 11, characterized in that: determining whether the operating temperature is between the first preset temperature and the second preset temperature, and if so, operating the circulating pump at a first preset power; The first preset power is a first preset multiple of the rated power of the circulation pump, and the second preset temperature is greater than the first preset temperature.

13. The control method according to claim 12, characterized in that: determining whether the operating temperature is between the second preset temperature and the third preset temperature, and if so, operating the circulating pump at a second preset power; The second preset power is a second preset multiple of the rated power of the circulation pump, the third preset temperature is greater than the second preset temperature, and the second preset multiple is greater than the first preset multiple.

14. The control method according to claim 13, wherein: determining whether the operating temperature is between the third preset temperature and the limit preset temperature; if so, operating the circulating pump at the second preset power, and the limit preset temperature is greater than the third preset temperature; It is also determined whether the operating temperature greater than the third preset temperature continues for more than a preset time. If so, the operating power of the motor is adjusted to a third preset multiple of the rated power of the motor, and the third preset multiple is less than 1.

15. The control method according to claim 14, characterized in that: The first preset temperature is 0.7 times the limit preset temperature; and / or, the second preset temperature is 0.8 times the limit preset temperature; And / or, the third preset temperature is 0.9 times the limit preset temperature.

16. The control method according to claim 14, wherein: The preset time is ten minutes.

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