Motor heat dissipation structure

Abstract

The application discloses a motor heat dissipation structure, which comprises a motor outer shell, a motor inner shell and an annular water channel between the motor inner shell and the motor outer shell, wherein the annular water channel comprises a cooling liquid inlet, a plurality of layers of cold water channels and a cooling liquid outlet, the cooling liquid inlet and the cooling liquid outlet are located on the motor outer shell, the cooling liquid inlet is communicated with the plurality of layers of cold water channels, the cooling liquid flows into the plurality of layers of cold water channels after entering the cooling liquid inlet, and the cooling liquid in the plurality of layers of cold water channels flows out from the cooling liquid outlet after being converged in one cold water channel. The motor heat dissipation structure adopts the design of the multi-directional flow channel, the cooling liquid in the flow channel only needs to pass through part of the surface to be cooled, the flow path of the cooling liquid is short, the rate of temperature rise of the cooling liquid is reduced, the temperature difference between the cooling liquid and the motor is large, and the heat dissipation efficiency of the motor is improved.

Description

Technical Field

[0001] This invention relates to the field of motor thermal control technology, and in particular to a heat dissipation structure for an automotive water-cooled motor. Background Technology

[0002] Most liquid cooling channels used in new energy vehicle motors adopt unidirectional flow, that is, the coolant enters from the inlet and flows in one direction to the outlet. As the coolant flows from the inlet to the outlet, the temperature of the coolant gradually increases, the temperature difference between the motor and the coolant gradually decreases, and the heat exchange effect of the coolant gradually deteriorates. This is not conducive to the uniformity of the motor temperature field, and the highest temperature of the motor generally occurs in the parts with poor heat exchange efficiency.

[0003] The unidirectional water cooling method involves arranging spiral or axial zigzag flow channels on the casing. The cross-section of the water channels is rectangular or fan-shaped. The coolant is a mixture of water and ethylene glycol in a 1:1 ratio. The heat inside the motor is transferred to the casing through layers of materials and then carried away by the coolant.

[0004] The main problems with existing technologies are:

[0005] 1. In a unidirectional flow channel, when the coolant flow rate or velocity increases continuously, the coolant contact time is short, which will lead to thermal saturation of the water flow. That is, the coolant has a critical saturation water volume, which causes the motor temperature to decrease and the speed to slow down as the flow rate increases.

[0006] 2. Existing water-cooled motor cooling channels have risks such as leakage, misalignment, and localized heat accumulation in the motor, and the flow resistance fluctuates greatly.

[0007] 3. Figure 1 This is a schematic diagram of a unidirectional water-cooled spiral flow channel in the prior art. Due to its unidirectional flow characteristics, the unidirectional spiral flow channel will result in one end being cold and the other end being hot after the motor is running. The highest temperature of the motor generally occurs at the hot end.

[0008] 4. Figure 2 This is a schematic diagram of a unidirectional water-cooled axial flow channel in the prior art. Due to the multiple 180° bends in the unidirectional axial reversal flow channel, in addition to the problem of high local resistance, secondary flow is prone to occur at the bends, which can create local dead water zones and reduce the effective heat exchange area. Therefore, motors using this flow channel are prone to local heat accumulation, high energy consumption of the required water pump, and low heat exchange efficiency.

[0009] 5. Existing spiral water channels and axial water channels have high requirements for the position of the motor inlet and outlet. The inlet and outlet cannot be arbitrarily arranged according to the needs of the whole vehicle. If the position of the motor inlet and outlet is not arranged on both sides in the traditional way, but is arbitrarily arranged in the middle, it will increase the difficulty of the traditional water channel layout, reduce the effective coverage area of ​​the water channel, and easily create dead water areas and cause local heat accumulation in the motor. Summary of the Invention

[0010] The purpose of this invention is to provide a heat dissipation structure for automotive water-cooled motors with multi-directional coolant flow.

[0011] To achieve the above objectives, the technical solution of this invention is as follows:

[0012] A motor heat dissipation structure includes a motor housing, a motor inner housing, and an annular water channel located between the motor inner housing and the motor housing. The annular water channel includes a coolant inlet, multiple layers of cold water channels, and a coolant outlet. The coolant inlet and coolant outlet are both located on the motor housing. The coolant inlet is connected to multiple cold water channels in multiple directions. After entering through the coolant inlet, the coolant simultaneously flows into multiple cold water channels in different directions. The coolant in the multiple cold water channels in different directions converges in one cold water channel and then flows out from the coolant outlet.

[0013] Furthermore, the coolant inlet is connected to two L-shaped cold water channels with opposite radial directions.

[0014] Furthermore, the coolant inlet is located in the third layer of cold water channel. The axial water channel where the coolant inlet is located crosses the third and second layers of cold water channels. The axial water channel where the coolant inlet is located and the portion of the first left radial cooling water channel located in front of the annular water channel form an L-shaped water channel. The vertical water channel where the coolant inlet is located and the portion of the first right radial cooling water channel located in front of the annular water channel also form an L-shaped water channel. The two L-shaped water channels are in opposite directions, and the coolant inlet is directly connected to the two L-shaped cold water channels in opposite directions.

[0015] Furthermore, diversion guide ribs are provided at the corners of the two L-shaped cold water channels with opposite radial directions.

[0016] Furthermore, the annular water channel includes at least six layers axially, and the six-layer annular water channel includes six layers of cold water channels from the first to the sixth layer; the first layer of cold water channel includes a first left radial cooling water channel and a first right radial cooling water channel; the second layer of cold water channel includes a second left radial cooling water channel and a second right radial cooling water channel; the third layer of cold water channel includes a third left radial cooling water channel and a third right radial cooling water channel; and the fourth layer of cold water channel includes a fourth left radial cooling water channel and a fourth right radial cooling water channel.

[0017] Furthermore, the first left radial cooling channel, the second left radial cooling channel, and the third left radial cooling channel are respectively the first layer cooling channel, the second layer cooling channel, and the third layer cooling channel located on the left radial portion of the annular channel; the fourth left radial cooling channel includes the left radial portion of the fourth layer cooling channel and the axial portion spanning the fourth left radial cooling channel, the fifth layer, and the sixth layer, a total of three layers of cooling channels.

[0018] The first right radial cooling channel, the second right radial cooling channel, and the third right radial cooling channel are respectively the first layer cooling channel, the second layer cooling channel, and the third layer cooling channel located on the right radial portion of the annular channel; the fourth right radial cooling channel includes the right radial portion of the fourth layer cooling channel and the axial portion spanning the fourth right radial cooling channel, the fifth layer, and the sixth layer, a total of three layers of cooling channels.

[0019] Furthermore, the first left radial cooling water channel and the second left radial cooling water channel are connected by a 180° elbow flow channel; the first right radial cooling water channel and the second right radial cooling water channel are connected by a 180° elbow flow channel.

[0020] The second left radial cooling channel and the third left radial cooling channel are connected by a 180° bend flow channel; the second right radial cooling channel and the third right radial cooling channel are connected by a 180° bend flow channel.

[0021] The third left radial cooling channel and the radial portion of the fourth left radial cooling channel are connected by a 180° elbow flow channel; the third right radial cooling channel and the radial portion of the fourth right radial cooling channel are connected by a 180° elbow flow channel.

[0022] The fourth left radial cooling water channel is connected to the sixth cooling water channel by a 90° bend flow channel; the fourth right radial cooling water channel is connected to the sixth cooling water channel by a 90° bend flow channel.

[0023] Furthermore, the fourth left radial cooling channel and the fourth right radial cooling channel are both connected to the sixth cooling channel; the sixth cooling channel is connected to the fifth cooling channel.

[0024] Furthermore, a first baffle is provided at the connection between the first left radial cooling water channel and the second left radial cooling water channel and at the connection between the first right radial cooling water channel and the second right radial cooling water channel. The first baffle axially spans two layers of water channels, and the first baffle separates the first left radial cooling water channel from the first right radial cooling water channel, and at the same time separates the second left radial cooling water channel from the second right radial cooling water channel.

[0025] A second baffle is provided at the connection between the third left radial cooling water channel and the radial portion of the fourth left radial cooling water channel and at the connection between the third right radial cooling water channel and the radial portion of the fourth right radial cooling water channel; the second baffle axially spans two layers of water channels and is used to separate the third left radial cooling water channel from the third right radial cooling water channel, and at the same time separate the fourth left radial cooling water channel from the fourth right radial cooling water channel.

[0026] The first or second partition plate is provided with pressure equalization holes.

[0027] Furthermore, a confluence guide rib is provided at the intersection of the fourth left radial cooling water channel, the fourth right radial cooling water channel, and the sixth cooling water channel.

[0028] The beneficial effects of this invention are:

[0029] 1. Traditional designs use a unidirectional flow channel, where the coolant must flow through all surfaces to be cooled in one direction. This results in a long coolant flow path, leading to a decreasing temperature difference between the coolant and the motor during the cooling process and a decline in heat dissipation efficiency. This invention employs a multidirectional flow channel design, where the coolant only needs to pass through a portion of the surfaces to be cooled. The shorter flow path reduces the rate at which the coolant temperature rises, and the larger temperature difference between the coolant and the motor further improves the motor's heat dissipation efficiency.

[0030] 2. This invention employs a design combining multi-directional and unidirectional flow channels. When using a unidirectional flow channel, due to the limitations of the unidirectional flow channel structure, the coolant reaches a critical saturation point when it reaches a certain volume, and further increasing the coolant flow rate will not significantly improve the cooling capacity. In this invention, the coolant inlet is connected to multiple cold water channels in multiple directions, allowing coolant to enter multiple channels simultaneously. This increases the critical saturation point and enables more areas of the motor to be cooled to exchange heat with the low-temperature coolant. Compared to traditional solutions, this invention provides a larger heat exchange area for the low-temperature coolant, which is more conducive to the heat dissipation of high-power motors.

[0031] 3. This invention features L-shaped flow-dividing guide ribs at the flow-dividing channels and confluence guide ribs at the coolant confluence points. The use of guide ribs effectively reduces the local resistance coefficient, and by setting the guide ribs, flow distribution control can be achieved at a physical level. Furthermore, the guide ribs create small-sized, uniform channels, which can balance the pressure of multiple flow channels, resulting in more uniform flow distribution. This also reduces the flow resistance of the coolant at channel corners, which is beneficial for improving heat dissipation efficiency.

[0032] 4. The present invention provides pressure equalization holes on the partition between the two water channels. The pressure equalization holes can make the pressure in the water channels on both sides the same. The same pressure in the water channels on both sides can make the liquid flow in the two channels even and stable. On the other hand, the even and stable flow of the liquid can prevent the coolant from crossing the water channels during the flow process.

[0033] 5. The coolant inlet and outlet arrangement of this invention is flexible and has low dependence on the position of the inlet and outlet. It can ensure effective heat exchange area coverage regardless of the position of the inlet and outlet. The design of the coolant inlet and outlet is also a necessary factor to consider in the water channel design. Traditional unidirectional water channels are highly dependent on the position of the inlet and outlet, that is, the inlet and outlet cannot be arranged arbitrarily. When the inlet and outlet are not ideal, the effective heat exchange area is usually sacrificed to achieve the purpose of water channel arrangement.

[0034] 6. In this invention, the multi-layer flow channels are arranged in parallel in the axial direction. The depth and height of each flow channel can be independently designed according to the motor's heat generation requirements. In areas with high cooling requirements, the flow channels of the corresponding layer can be designed to be deeper or wider, allowing more coolant to pass through the high-temperature areas, thereby sacrificing flow resistance to improve heat exchange efficiency. In areas with low cooling requirements, the thickness and width of the flow channels of the corresponding layer can be designed to be thinner and narrower, thereby sacrificing heat exchange to reduce flow resistance, thus optimizing and balancing heat exchange performance and flow resistance. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of a unidirectional water-cooled spiral flow channel in existing technology.

[0036] Figure 2 This is a schematic diagram of a unidirectional water-cooled axial flow channel in existing technology.

[0037] Figure 3 This is a schematic diagram of the motor of the present invention.

[0038] Figure 4 This is a cross-sectional view of the motor of the present invention.

[0039] Figure 5 This is a schematic diagram of the coolant flow direction according to the present invention.

[0040] Figure 6 This is a schematic diagram of the annular waterway of the present invention.

[0041] Figure 7 This is a frontal schematic diagram of the annular waterway of the present invention.

[0042] Figure 8 This is a schematic diagram of the back of the annular waterway of the present invention.

[0043] Wherein: First left radial cooling water channel 1a; First right radial cooling water channel 1b; Second left radial cooling water channel 2a; Second right radial cooling water channel 2b; Third left radial cooling water channel 3a; Third right radial cooling water channel 3b; Fourth left radial cooling water channel 4a; Fourth right radial cooling water channel 4b; Fifth cooling water channel 5; Sixth cooling water channel 6; Motor housing 7; Motor inner housing 8; Stator core 9; Winding 10; Rotor core 11; Annular water channel 12; Friction welding position at the insertion end 13; Friction welding position at the outlet end 14; Coolant inlet 15; Coolant outlet 16; Diverting channel 17; 180° elbow flow channel 18; 90° elbow flow channel 19; Diverting guide rib 20; Converging guide rib 21; First partition 22; Second partition 23; Equalizing hole 24. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0045] like Figure 3 and Figure 4 As shown, a liquid cooling structure for a new energy vehicle motor is disclosed. The motor includes a motor housing 7, a motor inner housing 8, a stator core 9, windings 10, and a rotor core 11. The cooling structure includes an annular water channel 12 formed between the motor inner housing 7 and the motor housing 8. The motor housing 7 and the motor inner housing 8 are connected by friction welding, which is mainly performed at the friction welding positions 13 at the plug-in end and 14 at the output end.

[0046] The annular water channel 12 includes a coolant inlet 15, multiple layers of cold water channels, and a coolant outlet 16.

[0047] In this invention, the coolant inlet 15 is connected to multiple cold water channels in different directions. After entering through the coolant inlet 15, the coolant flows into multiple cold water channels in different directions simultaneously. The coolant in the multiple cold water channels in different directions converges in one cold water channel and then flows out from the coolant outlet 16. This invention is illustrated by an example of an annular water channel 12 including six layers of cold water channels.

[0048] The annular water channel 12 includes six axial layers of cooling water channels, from the first to the sixth layer; the first layer of cooling water channels includes a first left radial cooling water channel 1a and a first right radial cooling water channel 1b; the second layer of cooling water channels includes a second left radial cooling water channel 2a and a second right radial cooling water channel 2b; the third layer of cooling water channels includes a third left radial cooling water channel 3a and a third right radial cooling water channel 3b; and the fourth layer of cooling water channels includes a fourth left radial cooling water channel 4a and a fourth right radial cooling water channel 4b.

[0049] like Figure 5 , Figure 7 and Figure 8 As shown, Figure 7 This is a front view of the annular waterway 12. Figure 8 This is a rear view of the annular water channel 12. The first left radial cooling water channel 1a, the second left radial cooling water channel 2a, and the third left radial cooling water channel 3a are respectively the first layer cooling water channel, the second layer cooling water channel, and the third layer cooling water channel located on the left radial side of the annular water channel 12. The fourth left radial cooling water channel 4a includes the left radial side of the fourth layer cooling water channel and the axial portion that spans the fourth left radial cooling water channel 4a, the fifth layer, and the sixth layer, a total of three layers of cooling water channels.

[0050] The first right radial cooling channel 1b, the second right radial cooling channel 2b, and the third right radial cooling channel 3b are respectively the radial portions of the first, second, and third layer cooling channels located on the right side of the annular channel 12; the fourth right radial cooling channel 4b includes the radial portion on the right side of the fourth layer cooling channel and the axial portion spanning the fourth right radial cooling channel 4b, the fifth layer, and the sixth layer, a total of three layers of cooling channels.

[0051] like Figure 5 and Figure 7 As shown, the coolant inlet 15 is located in the third layer of the cold water channel. The vertical water channel where the coolant inlet 15 is located crosses the third layer and the second layer of the cold water channel. The vertical water channel where the coolant inlet 15 is located and the part of the first left radial cooling water channel 1a located in front of the annular water channel form an L-shaped water channel. The vertical water channel where the coolant inlet 15 is located and the part of the first right radial cooling water channel 1b located in front of the annular water channel also form an L-shaped water channel. The two L-shaped water channels are in opposite directions. The coolant inlet 15 is directly connected to the two L-shaped cold water channels in opposite directions.

[0052] Coolant outlet 16 is located at the end of the fifth cooling channel 5.

[0053] After the coolant enters through coolant inlet 15, it splits into two, simultaneously entering the first left radial cooling channel 1a and the first right radial cooling channel 1b; as... Figure 6 As shown, an L-shaped flow divider rib 20 is provided at the bi-flow channel 17 where the coolant is divided into two. The coolant flows in the annular water channel 12 by being pressurized by a pump. Under the action of pressure, the coolant flows in the annular water channel 12. When a large amount of coolant flows in the channel, the coolant is easily blocked at the corner of the channel. After the coolant is blocked at the corner, the current method is to increase the pump pressure to keep the coolant flowing continuously. The flow divider rib 20 plays a role in diverting the flow to reduce the liquid flow resistance and can reduce the pressure of the pump pressurization.

[0054] The coolant in the first left radial cooling channel 1a flows sequentially into the second left radial cooling channel 2a, the third left radial cooling channel 3a, and the fourth left radial cooling channel 4a before entering the sixth cooling channel 6. Then, it enters the fifth cooling channel 5 from the sixth cooling channel 6 and finally flows out from the coolant outlet 16 located at the end of the fifth cooling channel 5.

[0055] The coolant in the first right radial cooling channel 1b flows sequentially into the second right radial cooling channel 2b, the third right radial cooling channel 3b, and the fourth right radial cooling channel 4b before entering the sixth cooling channel 6. Then, it enters the fifth cooling channel 5 from the sixth cooling channel 6 and finally flows out from the coolant outlet 16 located at the end of the fifth cooling channel 5.

[0056] The coolant that enters the first left radial cooling channel 1a and the coolant that enters the first right radial cooling channel 1b respectively merge at the inlet of the sixth cooling channel 6. After merging, the coolant flows from the sixth cooling channel 6 to the fifth cooling channel 5 and then flows out from the coolant outlet 16 located at the end of the fifth cooling channel 5.

[0057] like Figure 8 As shown, the first left radial cooling water channel 1a and the radial portion of the second left radial cooling water channel 2a are connected by a 180° bend flow channel 18; the first right radial cooling water channel 1b and the radial portion of the second right radial cooling water channel 2b are connected by a 180° bend flow channel.

[0058] like Figure 7 As shown, the second left radial cooling water channel 2a and the third left radial cooling water channel 3a are connected by a 180° bend flow channel; the second right radial cooling water channel 2b and the third right radial cooling water channel 3b are connected by a 180° bend flow channel.

[0059] like Figure 8 As shown, the third left radial cooling channel 3a and the radial portion of the fourth left radial cooling channel 4a are connected by a 180° bend flow channel; the third right radial cooling channel 3b and the radial portion of the fourth right radial cooling channel 4b are connected by a 180° bend flow channel.

[0060] like Figure 7 As shown, the fourth left radial cooling water channel 4a and the sixth cooling water channel 6 are connected by a 90° bend flow channel 19; the fourth right radial cooling water channel 4b and the sixth cooling water channel 6 are connected by a 90° bend flow channel.

[0061] like Figure 7 As shown, the sixth cooling water channel 6 and the fifth cooling water channel 5 are connected by a 180° elbow flow channel.

[0062] The coolant in the fourth left radial cooling channel 4a and the coolant in the fourth right radial cooling channel 4b merge at the inlet of the sixth cooling channel 6 and enter the fifth cooling channel 5, and then flow out from the coolant outlet 16 located at the end of the fifth cooling channel 5.

[0063] A merging guide rib 21 is provided at the confluence of the coolant in the fourth left radial cooling channel 4a and the coolant in the fourth right radial cooling channel 4b. That is, the merging guide rib 21 is provided at the entrance of the sixth channel. The merging guide rib 21 can be a horizontal plate. The merging guide rib can play a role in diverting the flow during the merging process, so as to reduce the flow resistance of the coolant at the corner of the channel.

[0064] A first baffle 22 is provided at the connection between the first left radial cooling water channel 1a and the second left radial cooling water channel 2a, and at the connection between the first right radial cooling water channel 1b and the second right radial cooling water channel 2b; a second baffle 23 is provided at the connection between the radial portions of the third left radial cooling water channel 3a and the fourth left radial cooling water channel 4a, and at the connection between the radial portions of the third right radial cooling water channel 3b and the fourth right radial cooling water channel 4b; as a preferred embodiment, such as Figure 8 As shown, a small through hole, which is a pressure equalization hole 24, can be provided on the first partition 22 or the second partition 23. The first partition 22 axially spans two layers of water channels and is used to separate the first left radial cooling water channel 1a from the first right radial cooling water channel 1b, and at the same time separate the second left radial cooling water channel 2a from the second right radial cooling water channel 2b. The second partition 23 axially spans two layers of water channels and is used to separate the third left radial cooling water channel 3a from the third right radial cooling water channel 3b, and at the same time separate the fourth left radial cooling water channel 4a from the fourth right radial cooling water channel 4b. The pressure equalization hole 24 can make the pressure in the water channels on both sides the same. The same pressure in the water channels on both sides can make the liquid flow in the channels on both sides balanced and stable. On the other hand, the balanced and stable flow of the liquid can prevent the coolant from crossing the water channels during the flow.

[0065] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper" or "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

Claims

1. A motor heat dissipation structure, comprising a motor housing (7), a motor inner housing (8), and an annular water channel (12) located between the motor inner housing (7) and the motor housing (8), the annular water channel (12) comprising a coolant inlet (15), multiple layers of cold water channels, and a coolant outlet (16), wherein the coolant inlet (15) and the coolant outlet (16) are both located on the motor housing (1), characterized in that: The coolant inlet (15) is connected to multiple cold water channels in different directions. After entering through the coolant inlet (15), the coolant flows into multiple cold water channels in different directions at the same time. The coolant in the multiple cold water channels in different directions merges in one cold water channel and flows out from the coolant outlet (16). The annular water channel (12) includes at least six layers along the axis. The six-layer annular water channel (12) includes six layers of cold water channels, from the first to the sixth layer. The first layer of cold water channels includes a first left radial cooling water channel (1a) and a first right radial cooling water channel (1b). The second layer of cold water channels includes a second left radial cooling water channel (2a) and a second right radial cooling water channel (2b). The third layer of cold water channels includes a third left radial cooling water channel (3a) and a third right radial cooling water channel (3b). The fourth layer of cold water channels includes a fourth left radial cooling water channel (4a) and a fourth right radial cooling water channel (4b). The first left radial cooling channel (1a), the second left radial cooling channel (2a), and the third left radial cooling channel (3a) are the portions of the first, second, and third cooling channels located to the left of the annular channel (12), respectively; the fourth left radial cooling channel (4a) includes the radial portion to the left of the fourth cooling channel and the axial portion spanning the fourth left radial cooling channel (4a), the fifth layer, and the sixth layer, a total of three cooling channels; The first right radial cooling channel (1b), the second right radial cooling channel (2b), and the third right radial cooling channel (3b) are the portions of the first, second, and third layer cooling channels located to the right of the annular channel (12), respectively; the fourth right radial cooling channel (4b) includes the radial portion to the right of the fourth layer cooling channel and the axial portion spanning the fourth right radial cooling channel (4b), the fifth layer, and the sixth layer, a total of three layers of cooling channels; the first left radial cooling channel (1a) and the second left radial cooling channel (2a) are connected by a 180° bend flow channel (18); the first right radial cooling channel (1b) and the second right radial cooling channel (2b) are connected by a 180° bend flow channel; The second left radial cooling channel (2a) and the third left radial cooling channel (3a) are connected by a 180° elbow flow channel; the second right radial cooling channel (2b) and the third right radial cooling channel (3b) are connected by a 180° elbow flow channel. The third left radial cooling channel (3a) and the fourth left radial cooling channel (4a) are connected by a 180° elbow flow channel in their radial portions; the third right radial cooling channel (3b) and the fourth right radial cooling channel (4b) are connected by a 180° elbow flow channel in their radial portions. The fourth left radial cooling channel (4a) is connected to the sixth cooling channel (6) by a 90° bend flow channel (19); the fourth right radial cooling channel (4b) is connected to the sixth cooling channel (6) by a 90° bend flow channel.

2. The motor heat dissipation structure as described in claim 1, characterized in that: The coolant inlet (15) is connected to two L-shaped cold water channels with opposite radial directions.

3. The motor heat dissipation structure as described in claim 2, characterized in that: The coolant inlet (15) is located in the third layer of cold water channel. The axial water channel where the coolant inlet (15) is located crosses the third layer and the second layer of cold water channel. The axial water channel where the coolant inlet (15) is located and the part of the first left radial cooling water channel (1a) located in front of the annular water channel form an L-shaped water channel. The vertical water channel where the coolant inlet (15) is located and the part of the first right radial cooling water channel (1b) located in front of the annular water channel also form an L-shaped water channel. The two L-shaped water channels are in opposite directions. The coolant inlet (15) is directly connected to the two L-shaped cold water channels in opposite directions.

4. The motor heat dissipation structure as described in claim 2, characterized in that: Diversion guide ribs (20) are provided at the corners of the two L-shaped cold water channels with opposite radial directions.

5. The motor heat dissipation structure as described in claim 1, characterized in that... The fourth left radial cooling channel (4a) and the fourth right radial cooling channel (4b) are both connected to the sixth cooling channel (6); the sixth cooling channel (6) is connected to the fifth cooling channel (5).

6. The motor heat dissipation structure as described in claim 1, characterized in that... A first partition (22) is provided at the connection between the first left radial cooling water channel (1a) and the second left radial cooling water channel (2a) and at the connection between the first right radial cooling water channel (1b) and the second right radial cooling water channel (2b). The first partition (22) spans the two water channels axially. The first partition (22) separates the first left radial cooling water channel (1a) and the first right radial cooling water channel (1b), and at the same time separates the second left radial cooling water channel (2a) and the second right radial cooling water channel (2b). A second partition (23) is provided at the connection between the radial portions of the third left radial cooling water channel (3a) and the fourth left radial cooling water channel (4a) and at the connection between the radial portions of the third right radial cooling water channel (3b) and the fourth right radial cooling water channel (4b); the second partition (23) spans the two water channels axially and is used to separate the third left radial cooling water channel (3a) and the third right radial cooling water channel (3b), and at the same time separate the fourth left radial cooling water channel (4a) and the fourth right radial cooling water channel (4b); The first partition (22) or the second partition (23) is provided with pressure equalization holes (24).

7. The motor heat dissipation structure as described in claim 1, characterized in that... A confluence guide rib (21) is provided at the intersection of the fourth left radial cooling water channel (4a), the fourth right radial cooling water channel (4b) and the sixth cooling water channel (6).

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