A driving motor active cooling system, automobile and method

Abstract

The application provides a driving motor active cooling system, an automobile and a method. The cooling system comprises: an oil cooling machine shell, a cooling oil channel is formed between the oil cooling machine shell and the stator core, and a spraying oil channel is formed between the oil cooling machine shell and the end winding; an oil supply assembly is configured to supply cooling oil to the cooling oil channel and the spraying oil channel; an oil pump is configured to pump the cooling oil in the cooling oil channel and the spraying oil channel back to the oil supply assembly; and a temperature sensor is configured to obtain the temperature of the end winding. When the temperature of the end winding is greater than a temperature threshold, the controller is configured to control the oil supply assembly to supply oil to the cooling oil channel and the spraying oil channel, and control the oil pump to pump the cooling oil in the cooling oil channel and the spraying oil channel back to the oil supply assembly. The driving motor active cooling system, the automobile and the method provided by the application can simultaneously cool the stator core and the end winding, improve the cooling effect, and simultaneously monitor the temperature of the end winding and accurately cool the motor.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of motor cooling, in particular to a driving motor active cooling system, a vehicle and a method. BACKGROUND

[0002] The higher the temperature of the motor, the greater the direct current resistance of the stator or rotor winding, and the greater the loss at the same current. It can be said that the temperature of the motor is one of the key factors affecting the output power of the motor.

[0003] At present, there are mainly two kinds of oil cooling technologies for motor cooling on the market:

[0004] 1. Using cooling oil to spray the outgoing line part of the motor stator to cool it;

[0005] 2. Make the cooling oil flow through the motor iron core to cool the iron core from the inside.

[0006] In the above two ways, the first one can only cool the outgoing line part of the motor stator, and cannot cool the high-temperature area in the middle of the motor iron core. The second one cannot cool the outgoing end of the motor, and in fact the heat is mainly concentrated on the stator iron core and the end winding, which makes both methods have the problem of low cooling efficiency and difficulty in effectively cooling the motor. SUMMARY

[0007] The present application provides a driving motor active cooling system, a vehicle and a method to solve the above-mentioned problem of difficult motor cooling.

[0008] In order to solve the above-mentioned problem, the present application adopts the following technical scheme:

[0009] The first aspect of the embodiment of the present application provides a driving motor active cooling system, the driving motor comprising a stator iron core and an end winding, and the cooling system comprising:

[0010] An oil cooling shell, the oil cooling shell being located outside the stator iron core and the end winding, and a cooling oil channel being formed between the oil cooling shell and the stator iron core, and a spraying oil channel being formed between the oil cooling shell and the end winding;

[0011] A oil supply assembly for providing cooling oil for the cooling oil channel and the spraying oil channel;

[0012] An oil pump for sending the cooling oil in the cooling oil channel and the spraying oil channel back to the oil supply assembly for circulation;

[0013] A temperature sensor for acquiring the temperature of the end winding;

[0014] The controller is configured to acquire the temperature of the end winding, and when the temperature of the end winding is greater than a temperature rise threshold, control the oil supply assembly to supply oil to the cooling oil channel and the spray oil channel, and control the oil pump to send the cooling oil in the cooling oil channel and the spray oil channel back to the oil supply assembly until the temperature of the end winding is less than or equal to the temperature rise threshold.

[0015] In a possible design, the controller is specifically configured to:

[0016] control the oil supply assembly to supply oil to the cooling oil channel and the spray oil channel until the temperature of the end winding is less than a set threshold, and start the oil pump (301) to send the cooling oil in the cooling oil channel and the spray oil channel back to the oil supply assembly.

[0017] In a possible design, the oil supply assembly includes an oil tank and an electromagnetic valve that controls the opening and closing of an oil outlet of the oil tank, and in the vertical direction, the liquid level of the cooling oil in the oil tank is located above the motor, and the controller is specifically configured to:

[0018] when the temperature of the end winding is greater than a temperature rise threshold, control the electromagnetic valve to open, so that the cooling oil in the oil tank enters the cooling oil channel and the spray oil channel.

[0019] In a possible design, the oil-cooled motor shell is provided with a spiral groove extending in the axial direction of the driving motor, and when the oil-cooled motor shell is arranged outside the stator core, the spiral groove and the stator core form the cooling oil channel.

[0020] In a possible design, the oil-cooled motor shell and the stator core are in interference fit, and a sealant is arranged between the oil-cooled motor shell and the stator core.

[0021] In a possible design, the oil-cooled motor shell and the end winding form a cavity that communicates with the cooling oil channel, the spray oil channel includes an oil distribution ring that divides the cavity into an oil storage cavity and a spray cavity, and the spray cavity is in contact with the end winding, and the oil distribution ring is uniformly provided with a plurality of spray oil holes that communicate between the oil storage cavity and the spray cavity.

[0022] The cooling oil channel is provided with a cooling oil inlet and a cooling oil outlet, the oil supply assembly is connected with the cooling oil inlet, and the oil pump is connected with the cooling oil outlet.

[0023] In a possible design, the inner diameter of the spray oil hole gradually decreases towards the direction close to the spray cavity.

[0024] The second aspect of the embodiment of the present application provides an automobile, which comprises a driving motor and the driving motor active cooling system according to any one of the first aspect, and the driving motor active cooling system is used for cooling the driving motor.

[0025] The third aspect of the present application provides a driving motor active cooling method, which is applied to the driving motor active cooling system according to any one of the first aspect of the embodiment of the present application, and the method comprises the following steps of:

[0026] obtaining the temperature of the end winding;

[0027] If the temperature of the end winding is greater than a temperature rise threshold value, the oil supply assembly is controlled to supply cooling oil to the cooling oil channel and the spraying oil channel, and the oil pump is controlled to send the cooling oil in the cooling oil channel and the spraying oil channel back to the oil supply assembly for circulation, until the temperature of the end winding is less than the temperature rise threshold value, and the oil supply assembly and the oil pump are controlled to stop working.

[0028] In a possible design, before starting the oil pump to send the cooling oil in the cooling oil channel and the spraying oil channel back to the oil supply assembly for circulation, the method comprises the following steps of:

[0029] obtaining the temperature of the end winding;

[0030] If the temperature of the end winding is less than a set threshold value, the oil pump is started.

[0031] The present application provides a driving motor active cooling system, an automobile and a method, the driving motor active cooling system comprises an oil cooling machine shell, an oil supply assembly, an oil pump, a temperature sensor and a controller, the cooling oil channel is formed between the oil cooling machine shell and the stator core, and the spraying oil channel is formed between the oil cooling machine shell and the end winding, in use, the controller obtains the temperature of the end winding through the temperature sensor, and when the temperature of the end winding is greater than a temperature rise threshold value, the oil supply assembly is controlled to supply oil to the cooling oil channel and the spraying oil channel, and the oil pump is controlled to send the cooling oil in the cooling oil channel and the spraying oil channel back to the oil supply assembly for circulation, until the temperature of the end winding is less than or equal to the temperature rise threshold value, in the cooling process, the cooling oil directly contacts the stator core, and the stator core can be directly cooled, the cooling efficiency is greatly improved, and the temperature of the motor can be monitored in real time through the temperature sensor, so that the motor is accurately cooled, and the operation performance of the motor is ensured.

[0032] It should be understood that the content described in this part is not intended to identify key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0033] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the application and, together with the description, further serve to explain the principles of the application.

[0034] Figure 1 A driving motor active cooling system structure schematic diagram provided for embodiments of the application;

[0035] Figure 2 A driving motor active cooling system working process schematic diagram provided for embodiments of the application Figure One ;

[0036] Figure 3 A driving motor active cooling system working process schematic diagram provided for embodiments of the application Figure Two .

[0037] Reference signs:

[0038] 101 - end winding, 102 - oil cooling shell, 103 - stator core, 201 - oil spraying channel, 202 - cooling oil channel, 301 - oil pump, 302 - oil filter, 303 - oil tank, 304 - electromagnetic valve, 305 - temperature sensor, 306 - motor controller, 307 - vehicle controller.

[0039] The above drawings have shown the specific embodiments of the application, which will be described in more detail hereinafter. These drawings and the written description are not intended to limit the scope of the inventive concept in any way, but to illustrate the inventive concept for the skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0040] The exemplary embodiments will be described in detail herein with reference to the attached drawings. The following description is made with reference to the accompanying drawings in which like reference numerals represent like elements, unless the context dictates otherwise. The following exemplary embodiments described in the following examples are not intended to be representative of all embodiments consistent with the application.

[0041] First, some of the terms involved in the embodiments of the application are explained:

[0042] Stator core: The motor is composed of a stator and a rotor. The stator generates alternating current, and the rotor forms a rotating magnetic field. The stator is the stationary part of the motor, which is composed of a stator core, a stator winding and a machine base. The stator core is an important part of the stator and the main component of the motor magnetic circuit, which is mainly composed of fan-shaped pieces, ventilation groove pieces, positioning ribs, upper and lower tooth pressure plates, tension bolts and supporting plates, etc.

[0043] End winding: The part of the stator winding protruding from the end of the stator.

[0044] At present, oil cooling is a relatively common cooling method in motor cooling, and in the related art, mainly through the cooling oil spraying the motor copper wire to cool the motor stator appearing part, or through the cooling oil flowing through the motor iron core inside, these two ways can only cool part of the motor, resulting in low cooling efficiency, and it is difficult to achieve ideal motor cooling effect.

[0045] The driving motor active cooling system provided in the application includes an oil cooling shell, an oil supply assembly, an oil pump, a temperature sensor and a controller. The oil cooling shell forms a cooling oil channel with the stator core and a spraying oil channel with the end winding. In use, the controller obtains the temperature of the end winding through the temperature sensor, and when the temperature of the end winding is greater than a temperature rise threshold, the controller controls the oil supply assembly to supply oil to the cooling oil channel and the spraying oil channel, and controls the oil pump to send the cooling oil in the cooling oil channel and the spraying oil channel back to the oil supply assembly for circulation until the temperature of the end winding is less than or equal to the temperature rise threshold. The stator core and the end winding can be cooled simultaneously through the cooling oil channel and the spraying oil channel, improving the cooling effect of the motor. In the cooling process, the cooling oil directly contacts the stator core, which can directly cool the stator core, further improving the cooling efficiency. In addition, the temperature of the motor can be monitored in real time through the temperature sensor, so that the motor can be accurately cooled, and the operation performance of the motor can be ensured.

[0046] The technical solutions of the embodiments of the application will be described in detail below with reference to the accompanying drawings, wherein it can be understood that the following embodiments can be combined arbitrarily, and similar designs in different embodiments can not be repeatedly described.

[0047] Figure 1 The driving motor active cooling system provided in the application is shown in the structural schematic diagram of the driving motor active cooling system provided in the application, and the driving motor active cooling system provided in the application includes an oil cooling shell 102, an oil supply assembly, an oil pump 301, a temperature sensor 305 and a controller. Figure 1

[0048] It can be understood that the driving motor active cooling system mentioned in the embodiments of the application is mainly used for cooling the motor, and the motor to be cooled includes a stator core 103 and an end winding 101.

[0049] ​Specifically, the oil cooling shell 102 is located outside the stator core 103 and the end winding 101, and the cooling oil channel 202 is formed between the oil cooling shell 102 and the stator core 103, and the spraying oil channel 201 is formed between the oil cooling shell 102 and the end winding 101, that is, the cooling oil can contact the stator core 103 through the cooling oil channel 202 and contact the end winding 101 through the spraying oil channel 201 to cool the motor; the oil supply assembly stores the cooling oil and is connected with the cooling oil channel 202 and the spraying oil channel 201 to provide the cooling oil for the cooling oil channel 202 and the spraying oil channel 201 when the motor is cooled; the oil pump 301 is also connected with the cooling oil channel 202 and the spraying oil channel 201, and the cooling oil in the cooling oil channel 202 and the spraying oil channel 201 is sent back to the oil supply assembly during the cooling process to assist the circulation of the cooling oil; the temperature sensor 305 is arranged at the end winding 101 of the motor, that is, the temperature sensor 305 is connected to the three-phase winding of the motor to measure the temperature of the end winding 101 in real time and send it to the controller; the controller is used to receive the temperature of the end winding 101, and when the temperature of the end winding 101 is greater than the temperature rise threshold, the oil supply assembly is controlled to supply oil to the cooling oil channel 202 and the spraying oil channel 201, and the oil pump 301 is controlled to send the cooling oil in the cooling oil channel 202 and the spraying oil channel 201 back to the oil supply assembly until the temperature of the end winding 101 is less than or equal to the temperature rise threshold.

[0050] Through the above scheme, at least the following effects can be achieved:

[0051] 1. When the temperature of the motor is too high, the stator core 103 and the end winding 101 can be cooled at the same time through the cooling oil channel 202 and the spraying oil channel 201, which greatly improves the cooling effect of the cooling system and can assist the motor to cool more quickly;

[0052] 2. The cooling oil can directly contact the stator core 103 after entering the cooling oil channel 202, which can improve the cooling effect of the stator core and further improve the cooling efficiency of the cooling system;

[0053] 3. The temperature of the motor can be monitored in real time by the temperature sensor 305, so that the motor can be cooled accurately and the operation performance of the motor can be guaranteed.

[0054] As a specific embodiment of the oil supply assembly, the oil supply assembly comprises an oil tank 303 and an electromagnetic valve 304 for controlling the opening and closing of the oil outlet of the oil tank 303, and in the vertical direction, the cooling oil level in the oil tank 303 is located above the motor. As long as the electromagnetic valve 304 is opened, the cooling oil in the oil tank 303 will automatically flow into the cooling oil channel 202 and the spraying oil channel 201 under the action of gravity, which not only helps to reduce the cost, but also reduces the space occupied by the cooling system, and facilitates the arrangement on the automobile. In addition, when it is necessary to supply oil to the cooling oil channel 202 and the spraying oil channel 201, the controller directly controls the electromagnetic valve 304 to be opened, and when it is necessary to stop supplying oil, the controller controls the electromagnetic valve 304 to be closed, and the control is also very simple.

[0055] In addition, an oil filter 302 can be arranged between the oil pump 301 and the oil tank 303 for filtering to remove impurities in the cooling oil and prevent the pipeline from being blocked. The oil tank 303 can also be connected to a heat exchange device to adjust the temperature of the cooling oil.

[0056] Of course, the oil supply assembly can also be a combination of the oil tank 303 and the pump, and the cooling oil is sent into the cooling oil channel 202 and the spraying oil channel 201 by the pump to cool the motor.

[0057] On the basis of the above embodiment, the oil-cooled motor shell 102 is provided with a spiral groove extending along the axial direction of the driving motor, and when the oil-cooled motor shell 102 is arranged outside the stator core 103, the spiral groove and the stator core 103 form the cooling oil channel 202. The cooling oil flows in the spiral groove and contacts the stator core 103 to cool the stator core 103, and the cooling oil channel 202 is arranged as a spiral groove, which not only guarantees the anti-deformation ability of the oil-cooled motor shell 102, but also effectively transports the cooling oil to cool the stator core 103.

[0058] Of course, it can be understood that the oil-cooled motor shell 102 and the stator core 103 are in sealed connection, and the oil-cooled motor shell 102 and the end winding 101 are in sealed connection, so as to prevent the cooling oil from leaking, for example, by sealing the end part by a sealing ring. In order to facilitate installation, the oil-cooled motor shell 102 and the stator core 103 can be in interference fit, and a sealing glue is arranged between the oil-cooled motor shell 102 and the stator core 103 for sealing.

[0059] As a specific embodiment of the spray oil channel 201, the oil cooling shell 102 and the end winding 101 form a cavity in communication with the cooling oil channel 202, and the cooling oil can flow between the cooling oil channel 202 and the spray oil channel 201. The spray oil channel 201 includes an oil distribution ring that separates the cavity into an oil storage cavity and a spray cavity, and the spray cavity is in contact with the end winding 101, that is, the spray cavity surrounds the outside of the end winding 101, and the oil storage cavity surrounds the outside of the spray cavity. The oil distribution ring is uniformly provided with a plurality of spray oil holes that communicate between the oil storage cavity and the spray cavity, the cooling oil channel 202 is provided with a cooling oil inlet and a cooling oil outlet, the oil supply assembly is connected with the cooling oil inlet, and the oil pump 301 is connected with the cooling oil outlet.

[0060] When the motor is cooled, the cooling oil enters the cooling oil channel 202 from the cooling oil inlet, enters the oil storage cavity through the cooling oil channel 202, and is sprayed into the spray cavity through the spray oil hole to contact the end winding 101, thereby cooling the end winding 101. The oil pump 301 extracts the cooling oil in the spray oil channel 201 and the cooling oil channel 202 after heat exchange with the motor through the cooling oil outlet, and sends it back to the oil tank 303 for circulation. During the entire process, the oil distribution ring is directly opposite to the end winding 101, and the cooling oil is sprayed on the end winding 101 through the spray oil hole, which can effectively cool the end winding 101.

[0061] Among them, the number of spray oil holes on the oil distribution ring can be designed according to the actual cooling demand, for example, 6, 8, 10, etc. In addition, the inner diameter of the spray oil hole can be gradually reduced towards the direction close to the spray cavity, that is, designed as a cone, which can effectively increase the spraying speed of the cooling oil and improve the cooling effect on the end winding 101.

[0062] Figure 2 The driving motor active cooling system control process provided by the embodiment of the application Figure One Please refer to Figure 2 The driving motor active cooling method of the embodiment includes the following steps based on the driving motor active cooling system of the above embodiment:

[0063] S201. Obtain the temperature of the end winding 101.

[0064] Specifically, the temperature sensor 305 can be connected with the three-phase winding of the motor, and the temperature of the end winding 101 can be obtained through the temperature sensor 305.

[0065] S202. According to the temperature of the end winding 101, determine whether to start the oil supply assembly and the oil pump 301.

[0066] Specifically, in the process of motor operation, if the temperature of the end winding 101 received by the controller is less than or equal to the temperature rise threshold, it indicates that the current temperature of the motor does not affect the performance of the motor, and cooling is not required.

[0067] When the temperature of the end winding 101 received by the controller is greater than the temperature rise threshold, it indicates that the temperature of the motor is too high at this time, which has affected the normal operation of the motor, and cooling is required to protect the operating performance of the motor. At this time, the controller controls the oil supply assembly to deliver cooling oil into the cooling oil channel 202 and the spraying oil channel 201 to cool the motor, and controls the oil pump 301 to pump out the cooling oil in the cooling oil channel 202 and the spraying oil channel 201 and deliver it to the oil supply assembly for circulation to cool the motor, until the temperature of the motor is no longer higher than the temperature rise threshold, thereby protecting the operating performance of the motor.

[0068] Figure 3 Control flow diagram of the driving motor active cooling system of the embodiment Figure Two Please refer to Figure 3 The driving motor active cooling method provided by the embodiment includes the following steps:

[0069] S301. Obtain the temperature of the end winding 101.

[0070] Specifically, the temperature sensor 305 is connected to the three-phase winding of the motor to directly measure the temperature of the end winding 101, and the controller receives the signal of the temperature sensor 305 to obtain the temperature of the end winding 101.

[0071] S302. If the temperature of the end winding 101 is greater than the temperature rise threshold, control the electromagnetic valve 304 to open, and the oil tank 303 supplies cooling oil to the cooling oil channel 202 and the spraying oil channel 201.

[0072] Specifically, in the process of motor operation, after the controller obtains the temperature of the end winding 101, the temperature of the end winding 101 is compared with the temperature rise threshold. If the temperature of the end winding 101 is less than the temperature rise threshold, the motor does not need to be cooled, and step S301 is repeated to obtain the temperature of the end winding 101, and the temperature of the motor is monitored.

[0073] If the temperature of the end winding 101 is greater than the temperature rise threshold, the electromagnetic valve 304 is controlled to open, so that the cooling oil automatically flows from the oil tank 303 into the cooling oil channel 202, enters the spraying oil channel 201 through the cooling oil channel 202, and cools the stator core 103 and the end winding 101 synchronously, so that the temperature of the motor decreases rapidly.

[0074] Wherein, the temperature rise threshold is a temperature value or temperature range value which is actually calibrated according to the parameters of the motor and does not affect the operation performance of the motor. Through the monitoring of the temperature sensor 305, the temperature of the motor is continuously controlled at this temperature or within the temperature range, so as to guarantee the operation performance of the motor.

[0075] S303. The temperature of the end winding 101 is continuously acquired, and if the temperature of the end winding 101 is less than the set threshold, the oil pump 301 is started to send the cooling oil in the cooling oil channel 202 and the spraying oil channel 201 back to the oil tank 303 for circulation, until the temperature of the end winding 101 is less than or equal to the temperature rise threshold, and the electromagnetic valve 304 and the oil pump 301 are closed.

[0076] Specifically, the cooling oil mainly relies on the oil pump 301 to circulate. First, the cooling oil is allowed to enter the cooling oil channel 202 for a period of time, so that the cooling oil has sufficient time to exchange heat with the stator core 103 and the end winding 101, and the temperature of the motor is reduced to below the set threshold. Then, the oil pump 301 is started to send the cooling oil in the cooling oil channel 202 and the spraying oil channel 201 back to the oil tank 303 for circulation to cool the motor. When the temperature of the end winding 101 is reduced to below the temperature rise threshold, it indicates that the current temperature of the motor will not affect the performance of the motor, and the electromagnetic valve 304 and the oil pump can be closed to stop cooling the motor.

[0077] Wherein, the set threshold is a pre-set temperature value or temperature range value, which is of course slightly higher than the temperature rise threshold.

[0078] Wherein, the above driving motor active cooling system can be used on all motors, especially the current new energy vehicles. When used on vehicles, the controller can be composed of the vehicle controller 307 and the motor controller 306. After the temperature sensor 305 measures the temperature of the end winding 101, unidirectional signal transmission is performed between the temperature sensor 305 and the motor controller 306 through a low-voltage electrical signal. The motor controller 306 and the vehicle controller 307 interact through a CAN bus. After the motor controller 306 receives the temperature of the end winding 101 measured by the temperature sensor 305, the temperature of the end winding 101 is compared with the temperature rise threshold. If the temperature of the end winding 101 is greater than the temperature rise threshold, the vehicle controller 307 controls the electromagnetic valve 304 to open, so that the cooling oil enters the cooling oil channel 202 and the spraying oil channel 201 to cool the motor.

[0079] Specifically, when the motor is running, the temperature of the motor will rise, the temperature sensor 305 measures the temperature of the end winding and feeds back to the motor controller 306, the motor controller 306 makes a temperature value comparison, if the temperature value of the end winding fed back by the temperature sensor 305 is higher than the temperature rise threshold value set in advance for the motor controller 306, the motor controller 305 sends a command to the vehicle controller 307 through the CAN bus, the vehicle controller 307 controls the electromagnetic valve to open, the cooling oil enters the cooling oil channel 202 and the spraying oil channel 201, and cools the stator core 103 and the end winding 102. When the temperature of the end winding is less than the set threshold value, the oil pump 303 starts to work, and the cooling oil in the cooling oil channel 202 and the spraying oil channel 201 enters the oil filter 302 under the action of the oil pump 303, and then enters the oil tank 303 after being filtered, and the oil tank 303 is connected to the heat exchange device. At this time, the cooling oil has completed a complete cooling oil circuit in the motor. If the temperature value fed back by the temperature sensor 305 is lower than the threshold value set by the motor controller 306, the vehicle controller 307 closes the electromagnetic valve 304 and the oil pump 301.

[0080] In addition, the controller can also be separately provided, which at least includes a memory and a processor, the memory stores a computer software program, and the processor executes the computer software program stored in the memory to realize the above-mentioned driving motor active cooling method.

[0081] The processor can be a central processing unit, and can also be other general-purpose processors, digital signal processors, application-specific integrated circuits, etc. The general-purpose processor can be a microprocessor, or the processor can also be any conventional processor, etc. The steps of the method disclosed in the present application can be directly embodied as hardware processor execution, or executed by a combination of hardware and software modules in the processor.

[0082] The memory can include a high-speed RAM memory, and can also include a non-volatile storage NVM, such as at least one disk memory.

[0083] It should be understood that various forms of flow shown above can be used to reorder, add or delete steps. For example, the steps described in the present application can be executed in parallel, or in sequence, or in different order, as long as the desired results of the technical solutions disclosed in the present application can be achieved, which is not limited herein.

[0084] The above specific embodiments do not constitute a limitation on the scope of protection of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent replacement and improvement made within the principles of the present application shall be included in the scope of protection of the present application.

Claims

1. An active cooling system for a drive motor, the drive motor comprising a stator core and end windings, characterized in that, The cooling system includes: An oil-cooled housing is located outside the stator core and the end windings, and a cooling oil channel is formed between the oil-cooled housing and the stator core, and a spray oil channel is formed between the oil-cooled housing and the end windings. An oil supply assembly is used to supply cooling oil to the cooling oil passages and spray oil passages; An oil pump is used to return the cooling oil in the cooling oil passages and spray oil passages to the oil supply assembly for circulation. A temperature sensor is used to obtain the temperature of the end winding; The controller is used to acquire the temperature of the end winding, and when the temperature of the end winding is greater than the temperature rise threshold, control the oil supply assembly to supply oil to the cooling oil passage and the spray oil passage, until the temperature of the end winding is less than the set threshold, control the oil pump to send the cooling oil in the cooling oil passage and the spray oil passage back to the oil supply assembly, until the temperature of the end winding is less than or equal to the temperature rise threshold, control the oil supply assembly and the oil pump to stop working; The set threshold is a pre-set temperature value or temperature range value, and the set threshold is higher than the temperature rise threshold.

2. The active cooling system for the drive motor according to claim 1, characterized in that, The oil supply assembly includes an oil tank and a solenoid valve that controls the opening and closing of the oil outlet of the oil tank. Vertically, the level of the cooling oil in the oil tank is above the motor. The controller is specifically used for: When the temperature of the end winding exceeds the temperature rise threshold, the solenoid valve is opened to allow the cooling oil in the oil tank to enter the cooling oil passage and the spray oil passage.

3. The active cooling system for the drive motor according to claim 1, characterized in that, The oil cooler housing is provided with a spiral groove extending along the axial direction of the drive motor. When the oil cooler housing is arranged around the outside of the stator core, the spiral groove and the stator core form the cooling oil channel.

4. The active cooling system for the drive motor according to claim 3, characterized in that, The oil cooler housing and the stator core are interference-fitted, and a sealant is provided between the oil cooler housing and the stator core.

5. The active cooling system for the drive motor according to claim 3, characterized in that, A cavity communicating with the cooling oil passage is formed between the oil cooler housing and the end winding. The spray oil passage includes an oil distribution ring that divides the cavity into an oil storage chamber and a spray chamber. The spray chamber is connected to the end winding. A plurality of spray oil holes communicating with the oil storage chamber and the spray chamber are evenly distributed on the oil distribution ring. The cooling oil passage is provided with a cooling oil inlet and a cooling oil outlet. The oil supply component is connected to the cooling oil inlet, and the oil pump is connected to the cooling oil outlet.

6. The active cooling system for the drive motor according to claim 5, characterized in that, The inner diameter of the spray oil hole gradually decreases towards the spray cavity.

7. A car, characterized in that, It includes a drive motor and an active cooling system for the drive motor as described in any one of claims 1-6, wherein the active cooling system for the drive motor is used to cool the drive motor.

8. A method for actively cooling a drive motor, applied to the active cooling system for a drive motor as described in any one of claims 1-6, characterized in that, include: Obtain the temperature of the end winding; If the temperature of the end winding is greater than the temperature rise threshold, the oil supply assembly is controlled to supply cooling oil to the cooling oil passage and the spray oil passage until the temperature of the end winding is less than the set threshold. Then, the oil pump is controlled to send the cooling oil in the cooling oil passage and the spray oil passage back to the oil supply assembly for circulation until the temperature of the end winding is less than or equal to the temperature rise threshold. Then, the oil supply assembly and the oil pump are controlled to stop working. The set threshold is a pre-set temperature value or temperature range value, and the set threshold is higher than the temperature rise threshold.

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