Automobile driving motor with cooling oil circuit structure and cooling method thereof

Abstract

The invention discloses an automobile driving motor with a cooling oil way structure and a cooling method thereof, and relates to the field of new energy automobile driving motor cooling, the automobile driving motor comprises a motor shell, the motor shell is hollow, and a rotor oil way inlet, a stator oil way inlet and an oil drainage port are formed in the motor shell; the rotor oil duct inlet and the stator oil duct inlet are used for connecting a cooling oil pump; the motor stator is coaxially fixed on the inner wall of the motor shell, a stator cooling oil duct communicated with the interior of the motor shell is formed in the motor stator, and the stator cooling oil duct is communicated with the stator oil duct inlet; and the motor rotor and the motor stator are coaxially arranged, a rotor cooling oil duct communicated with the interior of the motor shell is formed in the motor rotor, and the rotor cooling oil duct is communicated with the rotor oil duct inlet. The technical problem in the prior art that the central areas of the stator and the rotor in the driving motor are difficult to effectively cool through a conventional water cooling mode is solved.

Description

Technical Field

[0001] The present invention relates to the field of cooling of new energy vehicle drive motors, and in particular to an automobile drive motor with a cooling oil circuit structure and a cooling method thereof. Background Art

[0002] With the increasing global awareness of environmental protection and the transformation of energy structure, the new energy vehicle market is experiencing unprecedented vigorous development. This trend has not only promoted the popularization of new transportation tools such as electric vehicles and hybrid vehicles, but also put forward more stringent technical requirements for the core components of vehicles - drive motors. In particular, the power density and speed of the drive motor, as important indicators to measure its performance, are increasingly demanding as the market's expectations for vehicle range, acceleration performance and energy efficiency ratio increase.

[0003] The traditional water-cooled motor heat dissipation method performed well in dealing with early motors with lower performance requirements, but with the continuous advancement of motor technology and the increase in performance requirements, its limitations have gradually become apparent. The water cooling system is limited by the thermal conductivity of the coolant and the design of the flow path, and it is difficult to effectively deal with the large amount of heat generated by high-performance motors under high-load operation. In addition, the water cooling system is usually designed with pipes on the outside of the drive motor. For the stator and rotor center areas inside the drive motor, this heat is more concentrated and difficult to effectively dissipate through conventional water cooling methods. This not only causes the internal temperature of the motor to rise, exacerbating the heat loss, but also directly affects the efficiency, reliability and service life of the motor, thereby limiting the performance output and driving experience of the entire new energy vehicle. Summary of the invention

[0004] The present application provides an automobile drive motor with a cooling oil circuit structure and a cooling method thereof, which can solve the technical problem in the prior art that it is difficult to effectively cool the stator and rotor center areas inside the drive motor through conventional water cooling methods.

[0005] In a first aspect, an embodiment of the present application provides an automotive drive motor with a cooling oil circuit structure, comprising:

[0006] A motor housing, wherein the motor housing is hollow and is provided with a rotor oil passage inlet, a stator oil passage inlet and an oil drain port, wherein the rotor oil passage inlet and the stator oil passage inlet are used to connect to a cooling oil pump;

[0007] A motor stator, the motor stator is coaxially fixed on the inner wall of the motor housing, the motor stator is provided with a stator cooling oil channel connected to the inside of the motor housing, and the stator cooling oil channel is connected to the stator oil channel inlet;

[0008] And, a motor rotor, the motor rotor is rotatably arranged in the motor stator, and the motor rotor is coaxially arranged with the motor stator, and a rotor cooling oil channel connected to the inside of the motor housing is opened in the motor rotor, and the rotor cooling oil channel is connected to the rotor oil channel inlet.

[0009] In combination with the first aspect, in one implementation, the motor stator includes:

[0010] A stator core, wherein the stator core is fixed to the inner wall of the motor housing, and the stator cooling oil channel is opened along the length direction of the stator core and communicated with the interior of the motor housing;

[0011] And, a stator winding coil, wherein the stator winding coil is arranged on the side walls at both ends of the stator core in the length direction.

[0012] In combination with the first aspect, in one implementation, the connecting opening between the stator cooling oil channel and the motor housing is located between the stator winding coil and the motor housing.

[0013] In combination with the first aspect, in one implementation, the motor rotor includes:

[0014] A rotor core, the rotor core is rotatably arranged in the motor stator, and the rotor core and the motor stator are coaxially arranged;

[0015] And, a motor shaft, wherein the motor shaft is coaxially arranged in the rotor core, and the rotor cooling oil channel is opened on the motor shaft and communicated with the interior of the motor housing through the rotor core.

[0016] In combination with the first aspect, in one implementation, the rotor cooling oil passage includes:

[0017] A first oil passage, the first oil passage is opened on the motor shaft along the length direction of the motor shaft and is connected to the rotor oil passage inlet;

[0018] a second oil passage, the second oil passage being opened on the rotor core along the length direction of the rotor core and communicating with the interior of the motor housing;

[0019] And, a connecting oil passage, both ends of which connect the first oil passage and the second oil passage.

[0020] In combination with the first aspect, in one implementation, the motor rotor further includes:

[0021] The rotor end plate is arranged on the side walls at both ends of the rotor core in the length direction, and the rotor end plate is provided with an oil outlet channel corresponding to the opening of the rotor cooling oil channel.

[0022] In combination with the first aspect, in one implementation, the oil outlet channel is inclined from the motor shaft direction toward the motor stator direction.

[0023] In combination with the first aspect, in one embodiment, a vehicle drive motor with a cooling oil circuit structure further includes:

[0024] An oil storage tank is also provided at the bottom of the motor housing on the side wall of the motor housing. The oil drain port is provided at a position corresponding to the oil storage tank, and the oil drain port is used to connect to an oil cooler.

[0025] In a second aspect, an embodiment of the present application provides a cooling method for an automotive drive motor with a cooling oil circuit structure, which comprises the following steps:

[0026] Connecting a cooling oil pump to the rotor oil passage inlet and the stator oil passage inlet;

[0027] The cooling oil pump is turned on, and the cooling oil flows into the motor housing from the electronic cooling oil passage and the rotor cooling oil passage.

[0028] In conjunction with the second aspect, in one embodiment, a cooling method for an automotive drive motor with a cooling oil circuit structure further includes:

[0029] Connect the oil cooler to the oil drain port on the motor housing before starting the cooling oil pump;

[0030] The cooling oil pump and the oil cooler are turned on, and the cooling oil flows from the oil storage tank into the oil cooler.

[0031] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0032] By opening a stator cooling oil channel and a rotor cooling oil channel in the motor stator and the motor rotor, connecting the cooling oil pump with the rotor oil channel inlet and the stator oil channel inlet, and turning on the cooling oil pump, the cooling oil pump can enter the motor housing through the electronic cooling oil channel and the rotor cooling oil channel. The cooling oil takes away the heat of the motor stator and the motor rotor to cool the motor stator and the motor rotor, and is discharged through the oil drain port on the motor housing. At the same time, the cooling oil can also lubricate the motor stator and the motor rotor during the flow process, thereby solving the problem in the prior art that it is difficult to effectively cool the stator and rotor center areas inside the drive motor through conventional water cooling methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. 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 these drawings without creative work.

[0034] Figure 1 A cross-sectional top view of an automobile drive motor with a cooling oil circuit structure in the present application;

[0035] In the figure: 1. motor housing; 11. rotor oil passage inlet; 12. stator oil passage inlet; 2. motor stator; 21. stator cooling oil passage; 22. stator core; 23. stator winding coil; 3. motor rotor; 31. rotor cooling oil passage; 311. first oil passage; 312. second oil passage; 313. connecting oil passage; 32. motor shaft; 33. rotor core; 331. rotor end plate; 332. oil outlet passage; 4. oil storage tank. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0037] The embodiment of the present application provides an automobile drive motor with a cooling oil circuit structure and a cooling method thereof, which can solve the problem in the prior art that it is difficult to effectively cool the stator and rotor center areas inside the drive motor through conventional water cooling methods.

[0038] Reference Figure 1The present application discloses an automobile drive motor with a cooling oil circuit structure, comprising a motor housing 1, a motor stator 2 and a motor rotor 3. The motor housing 1 is hollow, and the motor stator 2 and the motor rotor 3 are coaxially arranged in the motor housing 1 in the axial direction of the motor housing 1 in sequence. The motor housing 1 is provided with a rotor oil channel inlet 11, a stator oil channel inlet 12 and an oil drain port, wherein the rotor oil channel inlet 11 and the stator oil channel inlet 12 are both used to connect a cooling oil pump so that the cooling oil of the cooling oil pump can enter the interior of the motor. The motor stator 2 is welded and fixed on the side wall inside the motor housing 1. A stator cooling oil channel 21 is opened on the motor stator 2. The stator cooling oil channel 21 is communicated with the stator oil channel inlet 12, so that the cooling oil of the cooling oil pump enters the stator cooling oil channel 21 through the stator oil channel inlet 12. The cooling oil is continuously pressurized and pumped into the cooling oil by the cooling oil pump, so that the cooling oil can flow through the stator cooling oil channel 21 to take away the heat generated when the motor stator 2 rotates; the motor rotor 3 is rotatably arranged in the motor stator 2, and a rotor cooling oil channel 31 is opened in the motor rotor 3. The rotor cooling oil channel 31 is communicated with the rotor oil channel inlet 11, so that the cooling oil of the cooling oil pump can pass through the rotor oil channel inlet 11. Entering the rotor cooling oil channel 31, the rotor can throw the cooling oil into the motor housing 1 during rotation, thereby taking away the heat of the motor rotor 3. The cooling oil flows out from the stator cooling oil channel 21 and the rotor cooling oil channel 31 of the motor stator 2 and the motor rotor 3, and finally gathers at the bottom of the motor housing 1 due to its own gravity, and is discharged through the oil drain port, so as to cool the motor stator 2 and the motor rotor 3. At the same time, the cooling oil can also lubricate the motor stator 2 and the motor rotor 3 during the flow process, thereby solving the problem in the prior art that it is difficult to effectively cool down the stator and rotor center areas inside the drive motor through conventional water cooling methods.

[0039] More specifically, the motor stator 2 includes a stator core 22 and a stator winding coil 23, which work together to achieve the conversion of electrical energy into mechanical energy. The stator core 22 is coaxially arranged with the motor housing 1, and is usually formed by stacking multiple layers of thin silicon steel sheets. The purpose of this is to reduce the eddy current loss generated by the stator core 22 during operation and improve the energy conversion efficiency. These silicon steel sheets are precisely stamped and cut to form a specific groove shape to accommodate and fix the stator winding coil 23. The stator core 22 is firmly welded and fixed to the inner wall of the motor housing 1 by welding technology to ensure that it maintains a stable position and shape inside the high-speed rotating motor. The stator winding coil 23 is a key component for realizing electrical energy conversion in the motor stator 2. The stator winding coil 23 is specifically composed of a plurality of insulated wires wound in the slots at both ends of the length direction of the stator core 22 according to a specific winding method and number of turns. When an external power source is applied to the stator winding coil 23, a rotating magnetic field is generated around the stator core 22. This magnetic field interacts with the permanent magnet or electromagnet in the motor rotor 3 to generate torque and drive the motor to rotate. The design and manufacturing quality of the stator winding coil 23 directly affect the output power, efficiency and operating stability of the motor. The stator cooling oil channel 21 is opened radially along the stator core 22 and communicated with the inside of the motor housing 1 to form a cooling channel for the cooling oil.

[0040] Furthermore, during the operation of the motor, the stator winding coil 23, as a key component of energy conversion, undertakes the important task of converting electrical energy into magnetic field energy. However, this conversion process is accompanied by a large amount of energy loss, which is mainly released in the form of heat energy. If this heat cannot be effectively dissipated, the temperature of the stator winding coil 23 will continue to rise, thereby affecting its electrical performance, such as increased resistance and decreased insulation performance. In severe cases, it may even cause insulation breakdown, short circuit and other faults, posing a serious threat to the stable operation of the motor. Therefore, in order to cool down the stator winding coil 23 at the same time, the connecting port between the stator cooling oil channel 21 and the motor housing 1 on the stator core 22 is located between the stator winding coil 23 and the motor housing 1. When the cooling oil pump continuously pumps cooling oil into the stator cooling oil channel 21 and pumps the cooling oil out from the connecting port between the stator cooling oil channel 21 and the motor housing 1, the cooling oil can flow through the stator winding coil 23 under the influence of the pressure of the cooling oil pump. This process not only reduces the temperature of the stator winding coil 23, but also improves the heat dissipation efficiency of the entire motor stator 2, effectively prolongs the service life of the motor, and improves the operating stability and reliability of the motor.

[0041] The motor rotor 3 includes a rotor core 33 and a motor shaft 32. The motor shaft 32 is coaxially rotatably penetrated in the motor stator 2, and the two ends of the motor shaft 32 in the length direction are rotatably connected to the two opposite side walls of the motor housing 1. The length direction of the motor shaft 32 is perpendicular to the axial direction of the motor stator 2; the motor shaft 32 is coaxially penetrated in the rotor core 33, and the two ends of the motor shaft 32 in the length direction axially penetrate from the rotor core 33 and are connected to the ends. The rotor cooling oil channel 31 is opened on the motor shaft 32 along the length direction of the motor shaft 32, and is connected to the inside of the motor housing 1 through the rotor core 33. When the cooling oil pump continuously pumps cooling oil toward the rotor cooling oil channel 31, the cooling oil flows through the motor shaft 32 and the rotor core 33 under the pumping pressure, and with the assistance of the rotation of the motor shaft 32 and the rotor core 33, the cooling oil is thrown into the motor housing 1 through the rotor cooling oil channel 31 to take away the heat of the motor shaft 32 and the two rotor cores 33, thereby cooling the motor rotor 3.

[0042] More specifically, the rotor cooling oil passage 31 includes a first oil passage 311, a second oil passage 312 and a connecting oil passage 313. The first oil passage 311 is opened on the motor shaft 32 along the length direction of the motor shaft 32, and one end of the first oil passage 311 is connected to the rotor oil passage inlet 11, so that cooling oil can be pumped into the motor shaft 32 to cool the motor shaft 32; the second oil passage 312 is opened on the rotor core 33 along the radial direction of the rotor core 33, and the second oil passage 312 is connected to the motor housing 1. In one embodiment of the present application, the second oil passage 312 runs through the rotor core 33 to uniformly cool the rotor core 33; the two ends of the connecting oil passage 313 connect the first oil passage 311 and the second oil passage 312, so that the cooling oil flows through the motor shaft 32 along the first oil passage 311 and then enters the second oil passage 312 through the connecting oil passage 313, and finally enters the motor housing 1, thereby synchronously cooling the motor shaft 32 and the rotor core 33.

[0043] Furthermore, since the rotor core 33 is composed of a plurality of rotor sheet units coaxially combined, in order to limit the position of the rotor core 33, rotor end plates 331 are further provided on the side walls at both ends of the length direction of the rotor core 33. The rotor end plates 331 are welded to the side walls of the rotor core 33, and an oil outlet channel 332 is provided at the opening of the rotor end plate 331 corresponding to the rotor cooling oil channel 31. The rotor end plate 331 can isolate a part of the influence of the interior of the motor housing 1 on the temperature of the rotor core 33, and at the same time can protect the side walls of the rotor core 33, and the setting of the oil outlet channel 332 does not affect the flow of cooling oil into the motor housing 1, which is more convenient to use.

[0044] Since the rotor core 33 rotates continuously during operation, the cooling oil pump will also throw the cooling oil out of the rotor cooling oil channel 31 through centrifugal force due to its rotation when pumping cooling oil. The stator core 22 and the stator winding coil 23 are both fixed on the motor housing 1. In order to assist in cooling the stator core 22 and the stator winding coil 23, the oil outlet channel 332 is inclined from the direction of the motor shaft 32 toward the direction of the motor stator 2, so that the cooling oil can fall on the stator winding coil 23 when it is thrown into the motor housing 1, and the side of the stator winding coil 23 facing the rotor core 33 is cooled, thereby improving the cooling efficiency.

[0045] In order to collect the cooling oil in the motor housing 1, an oil reservoir is also provided at the bottom of the motor housing 1. After the cooling oil flows into the motor housing 1 from the stator cooling oil channel 21 and the rotor cooling oil channel 31, it will naturally flow into the oil reservoir under the action of its own gravity. This natural flow process does not require additional power support, which saves energy and simplifies the structure of the cooling system. The oil drain port is opened at the position corresponding to the oil reservoir to facilitate the discharge of cooling oil from the motor housing 1. The oil reservoir is also used to connect the oil cooler so that the cooling oil with heat in the oil reservoir is discharged into the oil cooler. The oil cooler can cool the cooling oil. During actual installation, the oil cooler can be connected to the cooling oil pump to form a circulation loop of the motor cooling system to continuously cool the motor, which not only greatly improves the efficiency and reliability of the motor cooling system, but also makes the maintenance and maintenance of the motor simpler and more convenient. The staff only needs to regularly check the amount and quality of the cooling oil in the oil reservoir, as well as the working status of the oil cooler and the cooling oil pump, to ensure that the motor is always in the best working condition. In addition, due to the high degree of automation of the cooling oil circulation system, the frequency and intensity of manual intervention can be effectively reduced, further reducing the operating cost and maintenance cost of the motor, making it more convenient to use.

[0046] Based on the above-mentioned automobile drive motor with a cooling oil circuit structure, the present application also proposes a cooling method for an automobile drive motor with a cooling oil circuit structure, which specifically includes the following steps:

[0047] S1: Connect the cooling oil pump to the rotor oil passage inlet 11 and the stator oil passage inlet 12, connect the oil cooler and the oil drain port, and make the cooling oil pump and the oil cooler communicate with each other.

[0048] S2: Turn on the cooling oil pump and the oil cooler. The cooling oil flows into the stator cooling oil channel 21 and the rotor cooling oil channel 31, taking away the heat of the motor rotor 3 and the motor stator 2, and flows into the oil storage tank in the motor housing 1, and enters the oil cooler through the oil drain port. The discharged cooling oil is cooled by the oil cooler, and the cooled cooling oil returns to the cooling oil pump to perform a cooling cycle on the motor.

[0049] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0050] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0051] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. An automotive drive motor with a cooling oil circuit structure, characterized in that: It includes: A motor housing (1), the motor housing (1) being hollow, the motor housing (1) being provided with a rotor oil passage inlet (11), a stator oil passage inlet (12) and an oil drain port, the rotor oil passage inlet (11) and the stator oil passage inlet (12) being used for connecting a cooling oil pump; A motor stator (2), the motor stator (2) being coaxially fixed on the inner wall of the motor housing (1), the motor stator (2) being provided with a stator cooling oil passage (21) communicating with the interior of the motor housing (1), the stator cooling oil passage (21) being communicated with the stator oil passage inlet (12); And, a motor rotor (3), wherein the motor rotor (3) is rotatably disposed in the motor stator (2), and the motor rotor is coaxially disposed with the motor stator, and a rotor cooling oil passage (31) is provided in the motor rotor (3) and is connected to the interior of the motor housing (1), and the rotor cooling oil passage (31) is connected to the rotor oil passage inlet (11).

2. The automotive drive motor with a cooling oil circuit structure according to claim 1, characterized in that: The motor stator (2) comprises: A stator core (22), the stator core (22) being fixed on the inner wall of the motor housing (1), the stator cooling oil passage (21) being opened along the length direction of the stator core (22) and being in communication with the interior of the motor housing (1); And, a stator winding coil (23), wherein the stator winding coil (23) is arranged on the side walls at both ends of the stator core (22) in the length direction.

3. The automotive drive motor with a cooling oil circuit structure according to claim 2, characterized in that: The communication port between the stator cooling oil channel (21) and the motor housing (1) is located between the stator winding coil (23) and the motor housing (1).

4. The automotive drive motor with a cooling oil circuit structure according to claim 1, characterized in that: The motor rotor (3) comprises: A rotor core (33), the rotor core (33) being rotatably disposed in the motor stator (2), and the rotor core (33) and the motor stator (2) being coaxially disposed; And, a motor shaft (32), wherein the motor shaft (32) is coaxially inserted into the rotor core (33), and the rotor cooling oil passage (31) is opened on the motor shaft (32) and communicates with the interior of the motor housing (1) via the rotor core (33).

5. The automotive drive motor with a cooling oil circuit structure according to claim 4, characterized in that: The rotor cooling oil passage (31) comprises: A first oil passage (311), the first oil passage (311) being opened on the motor shaft (32) along the length direction of the motor shaft (32) and being in communication with the rotor oil passage inlet (11); a second oil passage (312), the second oil passage (312) being opened on the rotor core (33) along the length direction of the rotor core (33) and being in communication with the interior of the motor housing (1); And, a connecting oil passage (313), both ends of which connect the first oil passage (311) and the second oil passage (312).

6. The automotive drive motor with a cooling oil circuit structure according to claim 4, characterized in that: The motor rotor (3) further comprises: A rotor end plate (331), the rotor end plate (331) being arranged on the side walls at both ends of the rotor core (33) in the length direction, and the rotor end plate (331) being provided with an oil outlet channel (332) corresponding to the opening of the rotor cooling oil channel (31).

7. The automotive drive motor with a cooling oil circuit structure according to claim 6, characterized in that: The oil outlet channel (332) is arranged to be inclined from the direction of the motor shaft (32) toward the direction of the motor stator (2).

8. The automotive drive motor with a cooling oil circuit structure according to claim 1, characterized in that: Also includes: An oil storage tank is also provided at the bottom of the motor housing (1) and on the side wall of the motor housing (1); the oil drain port is provided at a position corresponding to the oil storage tank, and the oil drain port is used to connect to an oil cooler.

9. A cooling method for an automobile drive motor with a cooling oil circuit structure according to any one of claims 1 to 8, characterized in that: It includes the following steps: Connecting a cooling oil pump to the rotor oil passage inlet (11) and the stator oil passage inlet (12); The cooling oil pump is turned on, and the cooling oil flows from the electronic cooling oil channel and the rotor cooling oil channel (31) into the motor housing (1).

10. A cooling method for an automobile drive motor with a cooling oil circuit structure according to claim 9, characterized in that: Also includes: Before starting the cooling oil pump, connect the oil cooler to the oil drain port on the motor housing (1); The cooling oil pump and the oil cooler are turned on, and the cooling oil flows from the oil storage tank into the oil cooler.

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