Electric-motor cooling structure

Abstract

The present invention relates to the technical field of electric-motor cooling. Disclosed is an electric-motor cooling structure, comprising: an electric-motor housing, a stator core and a coil winding, wherein the electric-motor housing is provided with an oil inlet and an oil outlet; the stator core is arranged in the electric-motor housing, an oil path channel is formed between the stator core and the electric-motor housing, and the oil inlet and the oil outlet are respectively in communication with the oil path channel; the stator core comprises toothed portions, and winding slots are formed between adjacent toothed portions; the coil winding is sleeved on the toothed portions, such that the coil winding is located in the winding slots; and oil trough channels are provided inside the winding slots, and the oil trough channels are located at an axial end portion of the coil winding, and are in communication with the oil path channel, such that a cooling liquid flows into the oil trough channels through the oil path channel to cool the coil winding and dissipate heat therefrom. In the electric-motor cooling structure provided by the present invention, by means of arranging the oil trough channels at the axial end portion of the coil winding, there is no need to rely on oil passages formed between adjacent flat copper wires, thereby improving the applicability of the oil cooling mode.

Description

Motor cooling structure

[0001] This application claims priority from the following Chinese patent applications, the entire contents of which are incorporated herein by reference.

[0002] Application number: 202311724288.2 Application date: December 14, 2023 Invention name: A motor cooling structure

[0003] Application number: 202311726164.8 Application date: December 14, 2023 Name of invention: A motor cooling structure. Technical Field

[0004] The present invention relates to the technical field of motor cooling, and more particularly to a motor cooling structure. Background Art

[0005] During normal motor operation, heat is generated and transferred from the coils and stator core. If the motor's heat dissipation capacity is insufficient, the motor temperature can overheat. Excessive stator temperature damages the coil insulation, leading to a short circuit and motor burnout. To ensure safe and reliable motor operation, a cooling mechanism is required. Motor cooling methods primarily include air cooling, water cooling, and oil cooling, with oil cooling being the most effective.

[0006] In the existing technology, most oil cooling solutions use adjacent flat copper wires to form oil circuits in the slots. Whether the entire oil circuit can flow normally and whether the coolant in each slot can be evenly distributed depends largely on the manufacturing process of the flat wires. At the same time, the method of forming oil circuits in the slots with the help of adjacent copper wires cannot be applied to the scenario of round copper coils, resulting in poor applicability of the oil cooling method.

[0007] In addition, when changing the number of coil turns, the specifications of the flat wire need to be continuously adjusted, which will increase the overall production cost of the motor.

[0008] Therefore, how to improve the applicability of the oil cooling method has become a technical problem that needs to be solved urgently by those skilled in the art.

[0009] Summary of the Invention

[0010] In view of this, an object of the present invention is to provide a motor cooling structure to improve the applicability of the oil cooling method.

[0011] To achieve the above object, the present invention provides the following technical solutions:

[0012] A motor cooling structure, comprising:

[0013] A motor housing, wherein the motor housing is provided with an oil inlet and an oil outlet;

[0014] a stator core disposed in the motor housing, an oil passage formed between the stator core and the motor housing, the oil inlet and the oil outlet being respectively connected to the oil passage, and the stator core including teeth, with winding slots formed between adjacent teeth;

[0015] The coil winding is sleeved on the tooth portion so that the coil winding is located in the winding groove. An oil groove channel is provided in the winding groove, and the oil groove channel is located at the axial end of the coil winding. The oil groove channel is connected to the oil path channel so that the coolant flows into the oil groove channel through the oil path channel to cool the coil winding and dissipate heat.

[0016] Optionally, in the above motor cooling structure, the stator core includes a yoke connected to the lower end of the tooth portion, the coil winding has a first side and a second side arranged opposite to each other, and the first side of the coil winding is close to the yoke of the stator core;

[0017] A sealing plate is provided in the motor housing, and the sealing plate is located on the second side of the coil winding. The sealing plate is evenly provided with a plurality of ribs along the circumferential direction, and the ribs correspond to the winding grooves.

[0018] Optionally, in the above motor cooling structure, a first metal pressing plate is provided in the winding groove, and the first metal pressing plate is located on the first side of the coil winding or the second side of the coil winding.

[0019] Optionally, in the above-mentioned motor cooling structure, the first metal pressure plate is arranged on the first side of the coil winding, and the first metal pressure plate is tightly attached to the coil winding, the oil groove channel is formed between the first metal pressure plate and the yoke of the stator core, and a first slot wedge is provided on the second side of the coil winding, and the first slot wedge is used to fix the coil winding.

[0020] Optionally, in the above-mentioned motor cooling structure, the first metal pressure plate is arranged on the second side of the coil winding, and the first side of the coil winding is tightly attached to the yoke of the stator core, and the oil groove channel is formed between the first metal pressure plate and the rib of the sealing plate.

[0021] Optionally, in the above-mentioned motor cooling structure, the coil winding includes a bottom winding and a top winding, the bottom winding is tightly attached to the yoke of the stator core, a second slot wedge is provided between the top winding and the rib of the sealing plate, the second slot wedge is used to fix the top winding, and the oil tank channel is formed between the bottom winding and the top winding.

[0022] Optionally, in the above motor cooling structure, a second metal pressing plate is fixed to the bottom of the top winding and the top of the bottom winding respectively, and the oil groove channel is located between the two second metal pressing plates.

[0023] Optionally, in the above motor cooling structure, the coil winding is fixed by dripping paint, dipping paint or pouring glue.

[0024] Optionally, in the above-mentioned motor cooling structure, the stator core has an inner ring end face and an outer ring end face, the inner ring end face is the end face close to the motor shaft, and the outer ring end face is the end face away from the motor shaft, the oil circuit channel includes a first oil circuit channel and a second oil circuit channel, the first oil circuit channel is arranged on one side of the inner ring end face of the stator core, and the second oil circuit channel is arranged on one side of the outer ring end face of the stator core, and the oil tank channel is respectively connected to the first oil circuit channel and the second oil circuit channel, and the oil inlet and the oil outlet are respectively connected to the second oil circuit channel.

[0025] Optionally, in the above-mentioned motor cooling structure, the coil winding is formed by round copper wire wrapped around the tooth portion, the round copper wire of each tooth portion is closely arranged in sequence along the axial and radial directions of the tooth portion, and the round copper wires of adjacent teeth portion are tightly fitted, and an adhesive layer is provided between each round copper wire.

[0026] Optionally, in the above motor cooling structure, a plurality of flow-blocking members are evenly distributed along the circumferential direction on the oil channel to allow the coolant to flow in a directional manner.

[0027] The motor cooling structure provided by the present invention is characterized by providing an oil inlet and an oil outlet on the motor housing, and the stator core is provided in the motor housing, and an oil passage is formed between the stator core and the motor housing, and the oil inlet and the oil outlet are respectively connected to the oil passage. At the same time, the coil winding is sleeved on the teeth of the stator core so that the coil winding is located in the winding groove formed between adjacent teeth, and an oil groove passage is provided in the winding groove. The oil groove passage is located at the axial end position of the coil winding, and the oil groove passage is connected to the oil passage, so that the coolant enters the oil passage from the oil inlet of the motor housing, flows into the oil groove through the oil passage, cools the coil winding in the winding groove, and finally flows out from the oil outlet of the motor housing, thereby achieving the effect of heat dissipation for the coil winding.

[0028] Compared with the prior art, the motor cooling structure provided by the present invention, by arranging the oil trough channel at the axial end position of the coil winding, does not need to rely on the oil path formed between adjacent flat copper wires, and the oil trough channel is located in the winding slot, and the oil trough channel is connected to the oil path channel, so that the coolant enters the oil path channel from the oil inlet of the motor housing, and flows into the oil trough channel through the oil path channel to cool the coil winding in the winding slot, and finally flows out from the oil outlet of the motor housing, thereby achieving the effect of heat dissipation for the coil winding. By forming the oil trough channel in the axial direction of the coil winding, the coil winding is not limited to flat copper wire, but is also applicable to round copper wire, thereby realizing the heat dissipation method of oil cooling and improving the applicability of the oil cooling method. In addition, when the number of coil turns is changed, the round copper wire does not need to adjust the specifications like the flat copper wire, and the production cost of the motor coil will not increase. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0030] FIG1 is an exploded view of a motor cooling structure provided by an embodiment of the present invention;

[0031] FIG2 is a schematic structural diagram of a motor cooling structure provided by an embodiment of the present invention;

[0032] FIG3 is a schematic structural diagram of an oil circuit in a tank according to an embodiment of the present invention;

[0033] FIG4 is a schematic structural diagram of an oil circuit in a tank according to another embodiment of the present invention;

[0034] FIG5 is a schematic structural diagram of an oil circuit in a tank according to another embodiment of the present invention;

[0035] FIG6 is a schematic structural diagram of an oil circuit in a tank according to another embodiment of the present invention;

[0036] FIG. 7 is a schematic diagram showing the arrangement of coil windings according to an embodiment of the present invention.

[0037] In Figure 1-7, 100a is the motor housing, 101a is the oil inlet, 102a is the oil outlet, 103a is the sealing plate, 1031a is the rib, and 104a is the motor shaft; 200a is the stator core, 201a is the tooth portion, 202a is the winding slot, 2021a is the first metal pressure plate, 2022a is the first slot wedge, 2023a is the second slot wedge, 2024a is the second metal pressure plate, 203a is the yoke, 204a is the inner ring end face, 2041a is the first oil passage, 205a is the outer ring end face, 2051a is the second oil passage, and 206a is the flow blocking member; 300a is the coil winding, 301a is the oil groove passage, 302a is the bottom winding, 303a is the top winding, 304a is the round copper wire, and 305a is the adhesive layer.

[0038] FIG8 is an exploded view of a motor cooling structure provided by an embodiment of the present invention;

[0039] FIG9 is a schematic structural diagram of a motor cooling structure provided by an embodiment of the present invention;

[0040] FIG10 is a schematic structural diagram of an oil circuit in a tank according to an embodiment of the present invention;

[0041] FIG11 is a schematic structural diagram of an oil circuit in a tank according to another embodiment of the present invention;

[0042] FIG12 is a schematic structural diagram of an oil circuit in a tank according to another embodiment of the present invention;

[0043] FIG13 is a schematic structural diagram of an oil circuit in a tank according to another embodiment of the present invention;

[0044] FIG14 is a schematic structural diagram of a stator core provided in an embodiment of the present invention;

[0045] FIG15 is a schematic structural diagram of a motor housing provided in an embodiment of the present invention;

[0046] FIG16 is a schematic diagram showing the arrangement of coil windings according to an embodiment of the present invention.

[0047] In Figure 8-16, 100b is the motor housing, 101b is the oil inlet, 102b is the oil outlet, 103b is the sealing plate, 1031b is the rib, 104b is the motor shaft, 105b is the housing oil passage, 106b is the inner ring wall, 107b is the outer ring wall, and 108b is the bottom wall; 200b is the stator core, 201b is the tooth portion, 202b is the winding slot, 2021b is the first metal pressure plate, 2022b is the first slot wedge, and 202 3b is the second slot wedge, 2024b is the second metal pressure plate, 203b is the yoke, 2031b is the iron core oil channel, 204b is the inner ring end face, 2041b is the first oil channel, 205b is the outer ring end face, 2051b is the second oil channel, and 206b is the flow blocking member; 300b is the coil winding, 301b is the oil tank channel, 302b is the bottom winding, 303b is the top winding, 304b is the round copper wire, and 305b is the adhesive layer. DETAILED DESCRIPTION

[0048] Example 1

[0049] The core of the present invention is to provide a motor cooling structure to improve the applicability of the oil cooling method.

[0050] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0051] As shown in Figure 1, an embodiment of the present invention discloses a motor cooling structure, including a motor housing 100a, a stator core 200a and a coil winding 300a. It should be noted that in the prior art, most oil cooling solutions use adjacent flat copper wires to form an oil circuit in the slot, so that whether the entire oil circuit can circulate normally and whether the coolant in each slot can be evenly distributed depends largely on the manufacturing process of the flat wire. At the same time, the method of forming an oil circuit in the slot with the help of adjacent copper wires cannot be applied to the scenario of round copper coils, resulting in poor applicability of the oil cooling method. In addition, when changing the number of coil turns, it is necessary to continuously adjust the specifications of the flat wire, which will increase the overall manufacturing cost of the motor. The motor cooling structure disclosed in the embodiment of the present invention achieves heat dissipation for the coil winding 300a by disposing the oil trough channel 301a at the axial end of the coil winding 300a, eliminating the need for an oil path formed between adjacent flat copper wires. The oil trough channel 301a is located within the winding slot 202a and communicates with the oil passage. This allows coolant to enter the oil passage from the oil inlet 101a of the motor housing 100a, flow through the oil passage into the oil trough channel 301a, and cool the coil winding 300a within the winding slot 202a before finally flowing out of the oil outlet 102a of the motor housing 100a. This provides heat dissipation for the coil winding 300a. By forming the oil trough channel 301a axially in the coil winding 300a, the coil winding 300a is not limited to flat copper wire but is also applicable to round copper wire, thereby achieving an oil-cooled heat dissipation method and improving the applicability of the oil cooling method. Furthermore, when the number of coil turns is changed, the round copper wire does not need to be adjusted in size like the flat copper wire, and the cost of manufacturing the motor coil does not increase.

[0052] As shown in Figures 1 and 2, the motor housing 100a is provided with an oil inlet 101a and an oil outlet 102a, respectively, so that coolant enters the motor housing 100a through the oil inlet 101a and flows out through the oil outlet 102a, thereby dissipating heat and cooling the stator core 200a and coil winding 300a within the motor housing 100a. It should be noted that in this application, unless otherwise specified, cooling oil is used as the coolant to achieve an oil-cooling cooling method.

[0053] As shown in Figures 1 and 2, the stator core 200a is disposed within the motor housing 100a. An oil passage is formed between the stator core 200a and the motor housing 100a, with the oil inlet 101a and the oil outlet 102a respectively connected to the oil passage. Furthermore, the stator core 200a includes teeth 201a, with winding slots 202a formed between adjacent teeth 201a. The coil winding 300a is sleeved over the teeth 201a, such that the coil winding 300a is positioned within the winding slots 202a. Furthermore, as shown in Figure 2, an oil trough passage 301a is provided within the winding slots 202a. The oil trough passage 301a is located at an axial end of the coil winding 300a, i.e., an axial end face of the coil winding 300a. The oil trough passage 301a is connected to the oil passage, allowing coolant to flow through the oil passage into the oil trough passage 301a to cool the coil winding 300a. When coolant enters the oil channel through the oil inlet 101a of the motor housing 100a and flows into the oil trough 301a through the oil channel, it cools the coil winding 300a within the winding slot 202a, and finally flows out through the oil outlet 102a of the motor housing 100a, thereby achieving the effect of dissipating heat from the coil winding 300a. By forming the oil trough 301a in the axial direction of the coil winding 300a, the coil winding 300a is not limited to flat copper wire, but is also applicable to round copper wire, thereby achieving oil cooling heat dissipation and improving the applicability of oil cooling. In addition, when the number of coil turns is changed, the round copper wire does not need to be adjusted in specifications like flat copper wire, and the cost of motor coil production does not increase.

[0054] 1 and 2 , the stator core 200a has an inner ring end face 204a and an outer ring end face 205a that are relatively arranged, wherein the inner ring end face 204a is the end face close to the motor shaft 104a, and the outer ring end face 205a is the end face away from the motor shaft 104a. In addition, the oil passage includes a first oil passage 2041a and a second oil passage 2051a. The first oil passage 2041a is arranged on one side of the inner ring end face 204a of the stator core 200a, that is, between the inner ring end face 204a of the stator core 200a and the inner ring wall of the motor housing 100a. The second oil passage 2051a is arranged on one side of the outer ring end face 205a of the stator core 200a, that is, between the outer ring end face 205a of the stator core 200a and the outer ring wall of the motor housing 100a. The oil tank passage 301a is respectively connected to the first oil passage 2041a and the second oil passage 2051a, and the oil inlet 101a and the oil outlet 102a are respectively connected to the second oil passage 2051a. It should be noted that the stator core 200a is sleeved on the outside of the inner ring wall of the motor housing 100a, so that the inner ring wall of the motor housing 100a is located on the inner side of the inner ring end face 204a of the stator core 200a, and the outer ring wall of the motor housing 100a is located on the outside of the outer ring end face 205a of the stator core 200a.

[0055] Furthermore, as shown in FIG2 , to ensure directional flow of the coolant, multiple flow blockers 206a are provided on the oil passage. Each flow blocker 206a is provided with a socket, allowing the flow blockers 206a to be plugged into the protruding portion of the protruding tooth portion 201a of the coil winding 300a through the socket, thereby better matching the flow blockers 206a with the coil winding 300a. The flow blockers 206a are also secured by gluing. Specifically, for ease of understanding, the flow blockers 206a provided in the first oil passage 2041a are defined as first flow blockers, and the flow blockers 206a provided in the second oil passage 2051a are defined as second flow blockers. At the same time, the tooth portion 201a of the stator core 200a has a proximal end and a distal end that are relatively arranged. The proximal end of the tooth portion 201a is an end close to the motor shaft 104a, and the distal end of the tooth portion 201a is an end away from the motor shaft 104a. In addition, the first baffle is plugged into the protrusion of the protruding tooth portion 201a proximal end of the coil winding 300a through a socket to hinder the coolant from flowing along the first oil channel 2041a, thereby ensuring that the coolant flows from the first oil channel 2041a to the oil tank channel 301a, and from the oil tank channel 301a to the second oil channel 2051a, thereby achieving a directional flow effect of the coolant flowing from the first oil channel 2041a to the oil tank channel 301a to the second oil channel 2051a. Similarly, the second flow blocker is plugged into the protrusion at the distal end of the protruding tooth portion 201a of the coil winding 300a via a socket to block the flow of coolant along the second oil passage 2051a. This ensures that the coolant flows from the second oil passage 2051a to the oil trough passage 301a, and from the oil trough passage 301a to the first oil passage 2041a, thereby achieving a directional flow effect, with the coolant flowing from the second oil passage 2051a through the oil trough passage 301a to the first oil passage 2041a. It should be noted that the arrows in FIG. 2 indicate the direction of coolant flow.

[0056] As shown in FIG2 , in one specific embodiment, there are three first baffles and four second baffles. To ensure that the coolant is evenly distributed within the oil trough channel 301a and that the entire oil cooling circuit is properly circumferentially circumferentially oriented, the first baffles and the second baffles are alternately arranged, i.e., a first baffle or a second baffle is arranged every three oil trough channels 301a, thereby achieving alternating three-in, three-out flow of the coolant, which ultimately flows out through the oil outlet 102a on the motor housing 100a. Of course, the number of first and second baffles is not limited to the aforementioned embodiment, nor is it limited to the arrangement described in the aforementioned embodiment. For example, if there are four first baffles and three second baffles, the specific implementation is similar to that of the aforementioned embodiment and will not be further described herein. It should be noted that, in the above embodiment, the three inlets of the coolant refer to the coolant entering the first oil channel 2041a from the second oil channel 2051a through the three adjacent oil tank channels 301a; the three outlets of the coolant refer to the coolant flowing from the first oil channel 2041a through the three adjacent oil tank channels 301a to the second oil channel 2051a.

[0057] The motor cooling structure disclosed in an embodiment of the present invention is configured by setting an oil inlet 101a and an oil outlet 102a on the motor housing 100a, and the stator core 200a is set in the motor housing 100a, and an oil passage is formed between the stator core 200a and the motor housing 100a, and the oil inlet 101a and the oil outlet 102a are respectively connected to the oil passage. At the same time, the coil winding 300a is sleeved on the tooth portion 201a of the stator core 200a, so that the coil winding 300a is located in the winding groove 202a formed between adjacent tooth portions 201a, and an oil groove channel 301a is provided in the winding groove 202a. The oil groove channel 301a is located at the axial end position of the coil winding 300a. The oil groove channel 301a is connected with the oil passage, so that the coolant enters the oil passage from the oil inlet 101a of the motor housing 100a, and flows into the oil groove channel 301a through the oil passage to cool the coil winding 300a in the winding groove 202a, and finally flows out from the oil outlet 102a of the motor housing 100a, thereby achieving the effect of heat dissipation for the coil winding 300a.

[0058] Compared to the prior art, the motor cooling structure disclosed in the embodiments of the present invention eliminates the need for an oil path formed between adjacent flat copper wires by positioning the oil trough channel 301a at the axial end of the coil winding 300a. Furthermore, the oil trough channel 301a is located within the winding slot 202a and communicates with the oil path. This allows coolant to enter the oil path channel from the oil inlet 101a of the motor housing 100a, flow through the oil path channel into the oil trough channel 301a, and cool the coil winding 300a within the winding slot 202a before finally flowing out of the oil outlet 102a of the motor housing 100a, thereby dissipating heat from the coil winding 300a. By forming the oil trough channel 301a in the axial direction of the coil winding 300a, the coil winding 300a is not limited to flat copper wires but is also applicable to round copper wires, thereby achieving an oil-cooled heat dissipation method and improving the applicability of the oil cooling method. In addition, when changing the number of coil turns, the round copper wire does not need to adjust the specifications like the flat copper wire, and the production cost of the motor coil will not increase.

[0059] Furthermore, as shown in Figure 1, the stator core 200a includes a yoke 203a connected to the lower end of the tooth portion 201a, and the coil winding 300a has a first side and a second side disposed opposite each other. The first side of the coil winding 300a is adjacent to the yoke 203a of the stator core 200a, while the second side of the coil winding 300a is further away from the yoke 203a of the stator core 200a. Furthermore, a sealing plate 103a is disposed within the motor housing 100a. The sealing plate 103a is located on the second side of the coil winding 300a and has a plurality of ribs 1031a uniformly arranged along the circumferential direction, with the ribs 1031a corresponding to the winding slots 202a. Specifically, the sealing plate 103a has a first side and a second side disposed opposite each other, with the ribs 1031a disposed on the first side of the sealing plate 103a to increase its rigidity. At the same time, the second side surface of the sealing plate 103a is the surface in contact with the air gap, which is the gap between the stator and the rotor. The second side surface of the sealing plate 103a is a smooth plane, and the friction coefficient is reduced, which can effectively reduce the loss caused by friction with the air when the rotor rotates, thereby reducing the temperature rise of the magnetic steel and improving the efficiency of the motor.

[0060] Furthermore, as shown in Figures 3 and 4, in one embodiment, a first metal pressure plate 2021a is disposed within the winding slot 202a. The first metal pressure plate 2021a is located on either the first side or the second side of the coil winding 300a. Specifically, as shown in Figure 3, the coil winding 300a is first sleeved onto the teeth 201a of the stator core 200a, with the first side of the coil winding 300a in close contact with the yoke 203a of the stator core 200a. Simultaneously, the first metal pressure plate 2021a is pressed into the second side of the coil winding 300a, thereby forming an oil trough channel 301a between the first metal pressure plate 2021a and the rib 1031a of the sealing plate 103a. This allows coolant to flow into the oil trough channel 301a to dissipate heat from the coil winding 300a. By setting the first metal pressure plate 2021a on the second side of the coil winding 300a, it can act as a slot wedge, fixing the coil winding 300a in the winding slot 202a, and better transfer the heat generated by the coil winding 300a to the coolant in the oil tank channel 301a, thereby improving the heat dissipation efficiency.

[0061] Of course, as shown in Figure 4, the first metal pressure plate 2021a can also be disposed on the first side of the coil winding 300a, with the first metal pressure plate 2021a in close contact with the coil winding 300a, forming an oil groove channel 301a between the first metal pressure plate 2021a and the yoke 203a of the stator core 200a. To secure the coil winding 300a, a first slot wedge 2022a is disposed on the second side of the coil winding 300a. A certain gap exists between the first slot wedge 2022a and the rib 1031a of the sealing plate 103a. This prevents the force exerted on the coil winding 300a during motor operation from being transferred to the sealing plate 103a through the first slot wedge 2022a, thereby reducing the sealing effect. By arranging the first metal pressing plate 2021a on the first side of the coil winding 300a, the eddy current loss of the first metal pressing plate 2021a can be reduced, while the contact area between the coolant and the stator core 200a is increased, thereby improving the heat dissipation effect of the motor.

[0062] As shown in Figure 5, in another specific embodiment, the coil winding 300a includes a bottom winding 302a and a top winding 303a. The bottom winding 302a is tightly attached to the yoke 203a of the stator core 200a. A second slot wedge 2023a is provided between the top winding 303a and the rib 1031a of the sealing plate 103a to secure the top winding 303a. A certain gap exists between the second slot wedge 2023a and the rib 1031a of the sealing plate 103a to prevent forces acting on the coil winding 300a from being transferred to the sealing plate 103a through the second slot wedge 2023a during motor operation, thereby reducing the sealing effect. Furthermore, an oil channel 301a is formed between the bottom winding 302a and the top winding 303a. In this embodiment, the bottom winding 302a and the top winding 303a can be secured by dripping, dipping, or potting with glue. By forming an oil tank channel 301a between the bottom winding 302a and the top winding 303a, the coolant directly contacts the coil winding 300a, so that the heat dissipation effect is optimized and the motor slot fill rate is improved, but the fixing process of the coil winding 300a is relatively complicated.

[0063] 7 , the coil winding 300a is formed by winding the round copper wire 304a around the tooth portion 201a. Specifically, the round copper wire 304a of each tooth portion 201a is closely arranged in sequence along the axial direction and radial direction of the tooth portion 201a, and the round copper wires 304a of adjacent teeth 201a are closely fitted together. In this embodiment, as shown in FIG7 , the number of round copper wires 304a arranged horizontally (from the perspective of FIG7 ), i.e., along the radial direction of the tooth portion 201a, within the same winding slot 202a is 10, and the number arranged longitudinally (from the perspective of FIG7 ), i.e., along the axial direction of the tooth portion 201a, is 12. Furthermore, when the oil tank channel 301a is disposed between the bottom winding 302a and the top winding 303a, the number of bottom winding 302a and top winding 303a arranged longitudinally (from the perspective of FIG7 ) can be 6, respectively. This fully utilizes the space within the winding slot 202a, thereby increasing the motor slot fill rate. Furthermore, as shown in FIG7 , an adhesive layer 305a is disposed between each round copper wire 304a. In this embodiment, the adhesive layer 305a is formed between each round copper wire 304a through a glue potting process, thereby bonding and securing each round copper wire 304a to each other.

[0064] Of course, as shown in Figure 6, to reduce the difficulty of securing the coil winding 300a, a second metal pressing plate 2024a is secured to the bottom of the top winding 303a and the top of the bottom winding 302a, respectively, forming an oil trough 301a between the two second metal pressing plates 2024a. By providing two second metal pressing plates 2024a and positioning the oil trough 301a in the middle of the coil winding 300a, the coil winding 300a is divided into the bottom winding 302a and the top winding 303a. This reduces the difficulty of securing the coil winding 300a while improving the heat dissipation of the motor.

[0065] The terms "first," "second," and the like in the specification, claims, and accompanying drawings of the present invention are used to distinguish between different items, not to describe a specific order. Furthermore, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements and may include steps or elements that are not listed.

[0066] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

[0067] Example 2

[0068] The core of the present invention is to provide a self-locking electrical connection structure to improve the heat dissipation effect of the motor oil cooling method.

[0069] Another core of the present invention is to provide a high-voltage switchgear having the above-mentioned self-locking electrical connection structure.

[0070] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0071] As shown in Figure 8, an embodiment of the present invention discloses a motor cooling structure, including a motor housing 100b, a stator core 200b and a coil winding 300b. It should be noted that in the prior art, most oil cooling solutions use adjacent flat copper wires to form an oil circuit in the slot, so that whether the entire oil circuit can circulate normally and whether the coolant in each slot can be evenly distributed depends largely on the manufacturing process of the flat wire. At the same time, the method of using adjacent copper wires to form an oil circuit in the slot cannot be applied to the scenario of round copper coils, resulting in poor applicability of the oil cooling method. In addition, the heat generated by the stator core is only dissipated and cooled by forming an oil circuit in the slot by adjacent flat copper wires, resulting in low heat dissipation efficiency of the stator core, which limits the heat dissipation effect of the motor oil cooling method, thereby affecting the heat dissipation of the entire motor and reducing the working efficiency of the motor. In addition, when changing the number of coil turns, it is necessary to continuously adjust the flat wire specifications, which will increase the overall production cost of the motor. The motor cooling structure disclosed in the embodiment of the present invention achieves heat dissipation for the coil winding 300b by disposing the oil trough channel 301b at the axial end of the coil winding 300b, eliminating the need for an oil path formed between adjacent flat copper wires. The oil trough channel 301b is located within the winding slot 202b and communicates with the oil path. This allows coolant to enter the oil path channel from the oil inlet 101b of the motor housing 100b, flow through the oil path channel into the oil trough channel 301b, and cool the coil winding 300b within the winding slot 202b before finally flowing out of the oil outlet 102b of the motor housing 100b. This allows the coolant to dissipate heat for the coil winding 300b. By forming the oil trough channel 301b in the axial direction of the coil winding 300b, the coil winding 300b is not limited to flat copper wires but is also applicable to round copper wires, thereby achieving an oil-cooled heat dissipation method and improving the applicability of the oil cooling method. Furthermore, by providing housing oil passages 105b on motor housing 100b and core oil passages 2031b on stator core 200b, the heat dissipation effect of the motor oil cooling method is improved, while also effectively reducing the pressure drop of the coolant at the oil inlet 101b and oil outlet 102b on motor housing 100b. Furthermore, when the number of coil turns is changed, the round copper wire does not need to be adjusted in size, unlike flat copper wire, and the cost of motor coil production does not increase.

[0072] As shown in Figures 8 and 9, the motor housing 100b is provided with an oil inlet 101b and an oil outlet 102b, respectively, so that coolant enters the motor housing 100b through the oil inlet 101b and flows out through the oil outlet 102b, thereby dissipating heat and cooling the stator core 200b and coil winding 300b within the motor housing 100b. It should be noted that in this application, unless otherwise specified, cooling oil is used as the coolant to achieve an oil-cooling cooling method.

[0073] As shown in Figures 8 and 9, the stator core 200b is disposed within the motor housing 100b, with an oil passageway formed between the stator core 200b and the motor housing 100b. The oil inlet 101b and the oil outlet 102b are each connected to the oil passageway. Furthermore, the stator core 200b includes teeth 201b, with winding slots 202b formed between adjacent teeth 201b. The coil winding 300b is sleeved over the teeth 201b, such that the coil winding 300b is positioned within the winding slots 202b. Furthermore, as shown in Figure 9, an oil trough passage 301b is provided within the winding slots 202b. The oil trough passage 301b is located at an axial end of the coil winding 300b, i.e., an axial end face of the coil winding 300b. The oil trough passage 301b is connected to the oil passageway, allowing coolant to flow through the oil passageway into the oil trough passage 301b, thereby cooling the coil winding 300b. When the coolant enters the oil channel through the oil inlet 101b of the motor housing 100b and flows into the oil groove channel 301b through the oil channel, it cools the coil winding 300b in the winding groove 202b, and finally flows out through the oil outlet 102b of the motor housing 100b, thereby achieving the effect of dissipating heat for the coil winding 300b. By forming the oil groove channel 301b in the axial direction of the coil winding 300b, the coil winding 300b is not limited to flat copper wire, but is also applicable to round copper wire, thereby achieving an oil-cooled heat dissipation method and improving the applicability of the oil cooling method. In addition, when the number of coil turns is changed, the round copper wire does not need to be adjusted in specifications like flat copper wire, and the cost of manufacturing the motor coil does not increase.

[0074] At the same time, as shown in Figures 14 and 15, a housing oil passage 105b is provided on the motor housing 100b and is connected to the oil passage. This allows coolant to flow from the oil passage into the housing oil passage 105b, thereby improving the heat dissipation effect of the motor housing 100b and the stator core 200b. Alternatively, a core oil passage 2031b is provided on the stator core 200b and is connected to the oil passage. This allows coolant to flow from the oil passage into the core oil passage 2031b, thereby increasing the contact area between the coolant and the stator core 200b and improving the heat dissipation efficiency of the stator core 200b. Of course, the housing oil passage 105b can also be provided on the motor housing 100b, and the core oil passage 2031b can also be provided on the stator core 200b, thereby increasing the contact area between the coolant and the stator core 200b. By providing a housing oil passage 105b on the motor housing 100b and a core oil passage 2031b on the stator core 200b, not only the heat dissipation effect of the motor oil cooling method is improved, but also the pressure drop of the coolant at the oil inlet 101b and the oil outlet 102b on the motor housing 100b can be effectively reduced.

[0075] Furthermore, as shown in Figures 8 and 14 , the stator core 200b includes a yoke 203b, which has two opposing side surfaces. For ease of understanding, the two side surfaces of the yoke 203b are defined as a first side surface and a second side surface, respectively. The teeth 201b of the stator core 200b are connected to the first side surface of the yoke 203b, and the second side surface of the yoke 203b is in close contact with the motor housing 100b. The core oil passage 2031b is disposed on the second side surface of the yoke 203b. Furthermore, the coil winding 300b has a first side and a second side opposing each other, with the first side of the coil winding 300b being closer to the first side surface of the yoke 203b and the second side of the coil winding 300b being further away from the yoke 203b of the stator core 200b. As shown in Figures 8 and 15 , the motor housing 100b includes a bottom wall 108b that abuts the second side surface of the yoke 203b, and the housing oil passage 105b is disposed on the bottom wall 108b of the motor housing 100b. A sealing plate 103b is disposed within the motor housing 100b, positioned on the second side of the coil winding 300b. The sealing plate 103b is uniformly provided with a plurality of ribs 1031b along the circumferential direction, and the ribs 1031b correspond to the winding grooves 202b. Specifically, the sealing plate 103b has a first side surface and a second side surface that are disposed opposite each other, and the ribs 1031b are disposed on the first side surface of the sealing plate 103b to increase the rigidity of the sealing plate 103b. At the same time, the second side surface of the sealing plate 103b is the surface in contact with the air gap, which is the gap between the stator and the rotor. The second side surface of the sealing plate 103b is a smooth plane, and the friction coefficient is reduced, which can effectively reduce the loss caused by friction with the air when the rotor rotates, thereby reducing the temperature rise of the magnetic steel and improving the efficiency of the motor.

[0076] 8 , 9 and 15 , the motor housing 100 b includes an inner annular wall 106 b and an outer annular wall 107 b that are relatively arranged, and the inner annular wall 106 b , the outer annular wall 107 b and the bottom wall 108 b form an installation cavity for installing the stator core 200 b . The stator core 200b has an inner ring end face 204b and an outer ring end face 205b that are arranged opposite to each other, wherein the inner ring end face 204b is the end face close to the motor shaft 104b, and the outer ring end face 205b is the end face away from the motor shaft 104b, and the stator core 200b is sleeved on the outside of the inner ring wall 106b of the motor housing 100b, so that the inner ring wall 106b of the motor housing 100b is located on the inner side of the inner ring end face 204b of the stator core 200b, and at the same time, the outer ring wall 107b of the motor housing 100b is located on the outside of the outer ring end face 205b of the stator core 200b. The oil passage includes a first oil passage 2041b and a second oil passage 2051b. The first oil passage 2041b is arranged on one side of the inner ring end face 204b of the stator core 200b, that is, between the inner ring end face 204b of the stator core 200b and the inner ring wall 106b of the motor housing 100b. The second oil passage 2051b is arranged on one side of the outer ring end face 205b of the stator core 200b, that is, between the outer ring end face 205b of the stator core 200b and the outer ring wall 107b of the motor housing 100b, and the oil groove passage 301b is respectively connected to the first oil passage 2041b and the second oil passage 2051b, and the oil inlet 101b and the oil outlet 102b are respectively connected to the second oil passage 2051b.

[0077] Furthermore, as shown in FIG14 , in one embodiment, a plurality of first grooves are formed on the second side surface of the yoke 203b, and each of the first grooves is distributed along the circumference of the stator core 200b to form a core oil passage 2031b. Specifically, the first grooves are elongated grooves and extend from the inner ring end surface 204b of the stator core 200b to the outer ring end surface 205b of the stator core 200b, so that the first grooves are connected to the first oil passage 2041b and the second oil passage 2051b, respectively. This ensures that the coolant can circulate between the first oil passage 2041b, the core oil passage 2031b, and the second oil passage 2051b, thereby increasing the contact area between the coolant and the stator core 200b, improving the heat dissipation efficiency of the stator core 200b, and effectively reducing the pressure drop of the coolant at the oil inlet 101b and the oil outlet 102b on the motor housing 100b. Of course, the first groove is not limited to a long strip groove, but can also be an annular groove distributed radially along the stator core 200b, and each annular groove is interconnected through the long strip groove, thereby increasing the contact area between the coolant and the stator core 200b and improving the heat dissipation effect of the motor oil cooling method.

[0078] Furthermore, as shown in FIG15 , in one embodiment, a plurality of second grooves are formed on the bottom wall 108b of the motor housing 100b, and each second groove is distributed along the circumference of the motor housing 100b to form the housing oil passage 105b. Specifically, the second grooves are elongated grooves extending from the inner annular wall 106b of the motor housing 100b to the outer annular wall 107b of the motor housing 100b, such that the second grooves are connected to the first oil passage 2041b and the second oil passage 2051b, respectively. This ensures that the coolant can circulate between the first oil passage 2041b, the housing oil passage 105b, and the second oil passage 2051b, thereby increasing the contact area between the coolant and the motor housing 100b and the stator core 200b, improving the heat dissipation efficiency of the stator core 200b, and effectively reducing the pressure drop of the coolant at the oil inlet 101b and the oil outlet 102b of the motor housing 100b. Of course, the second groove is not limited to a long strip groove, but can also be an annular groove distributed radially along the motor housing 100b, and each annular groove is interconnected through the long strip groove, thereby increasing the contact area between the coolant and the motor housing 100b and the stator core 200b, and improving the heat dissipation effect of the motor oil cooling method.

[0079] In addition, as shown in FIG9 , to ensure that the coolant can flow in a directional manner, multiple flow blocks 206 b are provided on the oil passage, and each flow block 206 b is provided with a socket, so that the flow block 206 b can be plugged into the protruding portion of the protruding tooth portion 201 b of the coil winding 300 b through the socket, thereby better matching the flow block 206 b with the coil winding 300 b. The flow block 206 b is also fixed by gluing. Specifically, for ease of understanding, the flow block 206 b provided in the first oil passage 2041 b is defined as the first flow block, and the flow block 206 b provided in the second oil passage 2051 b is defined as the second flow block. At the same time, the tooth portion 201b of the stator core 200b has a proximal end and a distal end that are relatively arranged. The proximal end of the tooth portion 201b is an end close to the motor shaft 104b, and the distal end of the tooth portion 201b is an end away from the motor shaft 104b. In addition, the first baffle is plugged into the protrusion of the protruding tooth portion 201b proximal end of the coil winding 300b through the socket to hinder the coolant from flowing along the first oil channel 2041b, thereby ensuring that the coolant flows from the first oil channel 2041b to the oil tank channel 301b, and from the oil tank channel 301b to the second oil channel 2051b, thereby achieving a directional flow effect of the coolant flowing from the first oil channel 2041b to the oil tank channel 301b to the second oil channel 2051b. Similarly, the second flow blocker is plugged into the protrusion at the distal end of the protruding tooth portion 201b of the coil winding 300b via a socket to block the flow of coolant along the second oil passage 2051b, thereby ensuring that the coolant flows from the second oil passage 2051b to the oil trough passage 301b, and from the oil trough passage 301b to the first oil passage 2041b, thereby achieving a directional flow effect of the coolant flowing from the second oil passage 2051b through the oil trough passage 301b to the first oil passage 2041b. It should be noted that the direction of the arrow in Figure 9 represents the flow direction of the coolant.

[0080] As shown in FIG9 , in one specific embodiment, there are three first baffles and four second baffles. To ensure that the coolant is evenly distributed within the oil trough channel 301b and that the entire oil cooling circuit is properly circumferentially circumferentially regulated, the first baffles and the second baffles are alternately arranged, i.e., a first baffle or a second baffle is arranged every three oil trough channels 301b, thereby achieving alternating three-in, three-out flow of the coolant, which ultimately flows out through the oil outlet 102b on the motor housing 100b. Of course, the number of first and second baffles is not limited to the aforementioned embodiment, nor is it limited to the arrangement thereof. For example, if there are four first baffles and three second baffles, the specific implementation is similar to that of the aforementioned embodiment and will not be further described herein. It should be noted that, in the above embodiment, the three inlets of the coolant refer to the coolant entering the first oil channel 2041b from the second oil channel 2051b through the three adjacent oil tank channels 301b; the three outlets of the coolant refer to the coolant flowing from the first oil channel 2041b through the three adjacent oil tank channels 301b to the second oil channel 2051b.

[0081] It should be noted that the baffle 206b can not only hinder the flow of coolant along the oil channel, ensuring that the coolant circulates between the oil tank channel 301b and the oil channel in a predetermined direction, but also ensure that the coolant circulates between the oil channel and the core oil channel 2031b and the shell oil channel 105b in a predetermined direction, thereby forming a cooling circulation loop with inlet and outlet between the motor housing 100b and the stator core 200b, and finally discharged from the oil outlet 102b on the motor housing 100b, so as to achieve the effect of cooling and dissipating heat for the motor housing 100b and the stator core 200b.

[0082] The motor cooling structure disclosed in an embodiment of the present invention is configured by setting an oil inlet 101b and an oil outlet 102b on the motor housing 100b, and the stator core 200b is set in the motor housing 100b, and an oil passage is formed between the stator core 200b and the motor housing 100b, and the oil inlet 101b and the oil outlet 102b are respectively connected to the oil passage. At the same time, the coil winding 300b is sleeved on the tooth portion 201b of the stator core 200b, so that the coil winding 300b is located in the winding groove 202b formed between adjacent tooth portions 201b, and an oil groove channel 301b is provided in the winding groove 202b, and the oil groove channel 301b is located at the axial end position of the coil winding 300b. The oil groove channel 301b is connected with the oil passage, so that the coolant enters the oil passage from the oil inlet 101b of the motor housing 100b, and flows into the oil groove channel 301b through the oil passage to cool the coil winding 300b in the winding groove 202b, and finally flows out from the oil outlet 102b of the motor housing 100b, thereby achieving the effect of heat dissipation for the coil winding 300b. At the same time, a housing oil passage 105b connected to the oil passage can be provided on the motor housing 100b, so that the coolant flows from the oil passage into the housing oil passage 105b, thereby improving the heat dissipation effect of the motor housing 100b and the stator core 200b. A core oil passage 2031b connected to the oil passage can also be provided on the stator core 200b, so that the coolant flows from the oil passage into the core oil passage 2031b, thereby increasing the contact area between the coolant and the stator core 200b and improving the heat dissipation efficiency of the stator core 200b.

[0083] Compared to the prior art, the motor cooling structure disclosed in the embodiment of the present invention achieves heat dissipation for the coil winding 300b by positioning the oil trough channel 301b at the axial end of the coil winding 300b, eliminating the need for an oil path formed between adjacent flat copper wires. Furthermore, the oil trough channel 301b is located within the winding slot 202b and communicates with the oil path. This allows coolant to enter the oil path channel from the oil inlet 101b of the motor housing 100b, flow through the oil path channel into the oil trough channel 301b, and cool the coil winding 300b within the winding slot 202b before finally flowing out of the oil outlet 102b of the motor housing 100b. This allows coolant to dissipate heat for the coil winding 300b. By forming the oil trough channel 301b in the axial direction of the coil winding 300b, the coil winding 300b is not limited to flat copper wires but is also applicable to round copper wires, thereby achieving an oil-cooled heat dissipation method and improving the applicability of the oil cooling method. Furthermore, by providing housing oil passages 105b on motor housing 100b and core oil passages 2031b on stator core 200b, the heat dissipation effect of the motor oil cooling method is improved, while also effectively reducing the pressure drop of the coolant at the oil inlet 101b and oil outlet 102b on motor housing 100b. Furthermore, when the number of coil turns is changed, the round copper wire does not need to be adjusted in size, unlike flat copper wire, and the cost of motor coil production does not increase.

[0084] Furthermore, as shown in Figures 10 and 11, in one embodiment, a first metal pressure plate 2021b is provided in the winding slot 202b, and the first metal pressure plate 2021b is located on the first side or the second side of the coil winding 300b. Specifically, as shown in Figure 10, the coil winding 300b is first sleeved onto the tooth portion 201b of the stator core 200b, with the first side of the coil winding 300b in close contact with the first side surface of the yoke portion 203b of the stator core 200b. Simultaneously, the first metal pressure plate 2021b is pressed into the second side of the coil winding 300b, thereby forming an oil groove channel 301b between the first metal pressure plate 2021b and the rib 1031b of the sealing plate 103b, thereby allowing coolant to flow into the oil groove channel 301b to dissipate heat from the coil winding 300b. By setting the first metal pressure plate 2021b on the second side of the coil winding 300b, it can act as a slot wedge, fixing the coil winding 300b in the winding slot 202b, and better transfer the heat generated by the coil winding 300b to the coolant in the oil tank channel 301b, thereby improving the heat dissipation efficiency.

[0085] Of course, as shown in Figure 11, the first metal pressure plate 2021b can also be disposed on the first side of the coil winding 300b, and the first metal pressure plate 2021b is in close contact with the coil winding 300b to form an oil groove channel 301b between the first metal pressure plate 2021b and the first side surface of the yoke 203b of the stator core 200b. To secure the coil winding 300b, a first slot wedge 2022b is disposed on the second side of the coil winding 300b. A certain gap exists between the first slot wedge 2022b and the rib 1031b of the sealing plate 103b. This prevents the force exerted on the coil winding 300b during motor operation from being transferred to the sealing plate 103b through the first slot wedge 2022b, thereby reducing the sealing effect. By arranging the first metal pressing plate 2021b on the first side of the coil winding 300b, the eddy current loss of the first metal pressing plate 2021b can be reduced, while the contact area between the coolant and the stator core 200b is increased, thereby improving the heat dissipation effect of the motor.

[0086] As shown in Figure 12, in another specific embodiment, the coil winding 300b includes a bottom winding 302b and a top winding 303b. The bottom winding 302b is in close contact with the first side surface of the yoke 203b of the stator core 200b. A second slot wedge 2023b is provided between the top winding 303b and the rib 1031b of the sealing plate 103b to secure the top winding 303b. A certain gap exists between the second slot wedge 2023b and the rib 1031b of the sealing plate 103b to prevent forces acting on the coil winding 300b from being transferred to the sealing plate 103b through the second slot wedge 2023b during motor operation, thereby reducing the sealing effect. Furthermore, an oil channel 301b is formed between the bottom winding 302b and the top winding 303b. In this embodiment, the bottom winding 302b and the top winding 303b can be secured by dripping paint, dipping paint, or potting with glue. By forming an oil tank channel 301b between the bottom winding 302b and the top winding 303b, the coolant directly contacts the coil winding 300b, so that the heat dissipation effect is optimized and the motor slot fill rate is improved, but the fixing process of the coil winding 300b is relatively complicated.

[0087] 16 , the coil winding 300b is formed by winding the round copper wire 304b around the tooth portion 201b. Specifically, the round copper wire 304b of each tooth portion 201b is closely arranged in sequence along the axial direction and radial direction of the tooth portion 201b, and the round copper wires 304b of adjacent teeth 201b are closely fitted together. In this embodiment, as shown in FIG16 , the number of round copper wires 304b located in the same winding slot 202b arranged horizontally (from the perspective of FIG16 ), i.e., along the radial direction of the tooth portion 201b, is 10, and the number arranged longitudinally (from the perspective of FIG16 ), i.e., along the axial direction of the tooth portion 201b, is 12. Furthermore, when the oil groove channel 301b is provided between the bottom winding 302b and the top winding 303b, the number of bottom winding 302b and top winding 303b arranged longitudinally (from the perspective of FIG16 ) can be 6, respectively. This fully utilizes the space within the winding slot 202b, thereby improving the motor slot fill rate. Furthermore, as shown in FIG16 , an adhesive layer 305b is provided between each round copper wire 304b. In this embodiment, the adhesive layer 305b is formed between each round copper wire 304b through a glue potting process, thereby bonding and fixing each round copper wire 304b to each other.

[0088] Of course, as shown in Figure 13, to reduce the difficulty of securing the coil winding 300b, a second metal pressing plate 2024b is secured to the bottom of the top winding 303b and the top of the bottom winding 302b, respectively, forming an oil trough 301b between the two second metal pressing plates 2024b. By providing two second metal pressing plates 2024b and positioning the oil trough 301b in the middle of the coil winding 300b, the coil winding 300b is divided into the bottom winding 302b and the top winding 303b. This reduces the difficulty of securing the coil winding 300b while improving the heat dissipation of the motor.

[0089] The terms "first," "second," and the like in the specification, claims, and accompanying drawings of the present invention are used to distinguish between different items, not to describe a specific order. Furthermore, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements and may include steps or elements that are not listed.

[0090] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A motor cooling structure, characterized in that: include: A motor housing (100a), wherein the motor housing (100a) is respectively provided with an oil inlet (101a) and an oil outlet (102a); A stator core (200a) is arranged in a motor housing (100a), an oil passage is formed between the stator core (200a) and the motor housing (100a), the oil inlet (101a) and the oil outlet (102a) are respectively connected to the oil passage, and the stator core (200a) comprises a tooth portion (201a), and a winding groove (202a) is formed between adjacent tooth portions (201a); A coil winding (300a), wherein the coil winding (300a) is sleeved on the tooth portion (201a) so that the coil winding (300a) is located in the winding groove (202a), an oil groove channel (301a) is provided in the winding groove (202a), and the oil groove channel (301a) is located at an axial end of the coil winding (300a), and the oil groove channel (301a) is connected to the oil passage, so that coolant flows into the oil groove channel (301a) through the oil passage to cool and dissipate heat for the coil winding (300a).

2. The motor cooling structure according to claim 1, characterized in that: The stator core (200a) comprises a yoke (203a) connected to the lower end of the tooth portion (201a); the coil winding (300a) comprises a first side and a second side arranged opposite to each other, and the first side of the coil winding (300a) is close to the yoke (203a) of the stator core (200a); A sealing plate (103a) is arranged in the motor housing (100a), and the sealing plate (103a) is located on the second side of the coil winding (300a). The sealing plate (103a) is evenly provided with a plurality of convex ribs (1031a) along the circumferential direction, and the convex ribs (1031a) correspond to the winding grooves (202a).

3. The motor cooling structure according to claim 2, characterized in that: A first metal pressing plate (2021a) is arranged in the winding groove (202a), and the first metal pressing plate (2021a) is located on a first side of the coil winding (300a) or a second side of the coil winding (300a).

4. The motor cooling structure according to claim 3, characterized in that: The first metal pressure plate (2021a) is arranged on the first side of the coil winding (300a), and the first metal pressure plate (2021a) is tightly attached to the coil winding (300a), the oil groove channel (301a) is formed between the first metal pressure plate (2021a) and the yoke (203a) of the stator core (200a), and a first slot wedge (2022a) is arranged on the second side of the coil winding (300a), and the first slot wedge (2022a) is used to fix the coil winding (300a).

5. The motor cooling structure according to claim 3, characterized in that: The first metal pressure plate (2021a) is arranged on the second side of the coil winding (300a), and the first side of the coil winding (300a) is tightly attached to the yoke (203a) of the stator core (200a), and the oil groove channel (301a) is formed between the first metal pressure plate (2021a) and the rib (1031a) of the sealing plate (103a).

6. The motor cooling structure according to claim 2, characterized in that: The coil winding (300) comprises a bottom winding (302a) and a top winding (303a); the bottom winding (302a) is in close contact with the yoke (203a) of the stator core (200a); a second slot wedge (2023a) is provided between the top winding (303a) and the convex rib (1031a) of the sealing plate (103a); the second slot wedge (2023a) is used to fix the top winding (303a); and the oil groove channel (301a) is formed between the bottom winding (302a) and the top winding (303a).

7. The motor cooling structure according to claim 6, characterized in that: A second metal pressing plate (2024a) is fixed to the bottom of the top winding (303a) and the top of the bottom winding (302a), respectively, and the oil groove channel (301a) is located between the two second metal pressing plates (2024a).

8. The motor cooling structure according to claim 6, characterized in that: The coil winding (300a) is fixed by means of dripping paint, dipping paint or pouring glue.

9. The motor cooling structure according to claim 1, characterized in that: The stator core (200a) comprises an inner ring end face (204a) and an outer ring end face (205a), wherein the inner ring end face (204a) is an end face close to the motor shaft (104a), and the outer ring end face (205a) is an end face away from the motor shaft (104a), and the oil passage comprises a first oil passage (2041a) and a second oil passage (2051a), wherein the first oil passage (2041a) is arranged on the stator core. The second oil passage (2051a) is arranged on one side of the inner ring end surface (204a) of the stator core (200a), the second oil passage (2051a) is arranged on one side of the outer ring end surface (205a) of the stator core (200a), and the oil groove passage (301a) is respectively connected to the first oil passage (2041a) and the second oil passage (2051a), and the oil inlet (101a) and the oil outlet (102a) are respectively connected to the second oil passage (2051a).

10. The motor cooling structure according to claim 1, characterized in that: The coil winding (300a) is formed by winding a round copper wire (304a) around the tooth portion (201a); the round copper wire (304a) of each tooth portion (201a) is closely arranged in sequence along the axial direction and radial direction of the tooth portion (201a), and the round copper wires (304a) of adjacent tooth portions (201a) are closely fitted; and an adhesive layer (305a) is provided between each of the round copper wires (304a).

11. The motor cooling structure according to any one of claims 1 to 10, characterized in that: A plurality of flow-blocking components (206a) are evenly distributed along the circumferential direction on the oil passage to allow the coolant to flow in a directional direction.

12. A motor cooling structure, characterized in that: include: A motor housing (100b), wherein the motor housing (100b) is respectively provided with an oil inlet (101b) and an oil outlet (102b); A stator core (200b) is arranged in a motor housing (100b), an oil passage is formed between the stator core (200b) and the motor housing (100b), the oil inlet (101b) and the oil outlet (102b) are respectively connected to the oil passage, and the stator core (200b) comprises a tooth portion (201b), and winding grooves (202b) are formed between adjacent tooth portions (201b); The motor housing (100b) is provided with a housing oil passage (105b) in communication with the oil passage, and / or the stator core (200b) is provided with an iron core oil passage (2031b) in communication with the oil passage; A coil winding (300b) is sleeved on the tooth portion (201b) so that the coil winding (300b) is located in the winding groove (202b); an oil groove channel (301b) is provided in the winding groove (202b), and the oil groove channel (301b) is located at the axial end of the coil winding (300b); the oil groove channel (301b) is connected to the oil passage, so that coolant flows into the oil groove channel (301b) through the oil passage to cool the coil winding (300b) and dissipate heat.

13. The motor cooling structure according to claim 12, characterized in that: The stator core (200b) comprises a yoke (203b), the yoke (203b) having a first side surface and a second side surface that are arranged opposite to each other, the tooth portion (201b) is connected to the first side surface of the yoke (203b), the second side surface of the yoke (203b) is in close contact with the motor housing (100b), the coil winding (300b) has a first side and a second side that are arranged opposite to each other, the first side of the coil winding (300b) is close to the first side surface of the yoke (203b), and the core oil passage (2031b) is arranged on the second side surface of the yoke (203b); The motor housing (100b) comprises a bottom wall (108b) closely attached to the second side surface of the yoke (203b); the housing oil passage (105b) is arranged on the bottom wall (108b) of the motor housing (100b); a sealing plate (103b) is arranged in the motor housing (100b); the sealing plate (103b) is located on the second side of the coil winding (300b); and the sealing plate (103b) is evenly arranged in the circumferential direction. A plurality of convex ribs (1031b) are provided, and the convex ribs (1031b) correspond to the winding grooves (202b).

14. The motor cooling structure according to claim 13, characterized in that: The stator core (200b) comprises an inner ring end face (204b) and an outer ring end face (205b), wherein the inner ring end face (204b) is an end face close to the motor shaft (104b), and the outer ring end face (205b) is an end face away from the motor shaft (104b), and the oil passage comprises a first oil passage (2041b) and a second oil passage (2051b), wherein the first oil passage (2041b) is arranged on the stator core. The second oil passage (2051b) is arranged on one side of the inner ring end face (204b) of the stator core (200b), the second oil passage (2051b) is arranged on one side of the outer ring end face (205b) of the stator core (200b), and the oil groove passage (301b) is respectively connected with the first oil passage (2041b) and the second oil passage (2051b), and the oil inlet (101b) and the oil outlet (102b) are respectively connected with the second oil passage (2051b).

15. The motor cooling structure according to claim 14, characterized in that: A plurality of first grooves are formed on the second side surface of the yoke (203b), and each of the first grooves is distributed along the circumference of the stator core (200b) to form the core oil passage (2031b); The first groove extends from the inner ring end surface (204b) of the stator core (200b) to the outer ring end surface (205b) of the stator core (200b), so that the first groove is connected to the first oil channel (2041b) and the second oil channel (2051b) respectively.

16. The motor cooling structure according to claim 14, characterized in that: The motor housing (100b) comprises an inner annular wall (106b) and an outer annular wall (107b) which are arranged opposite to each other, and the inner annular wall (106b), the outer annular wall (107b) and the bottom wall (108b) are arranged to form a mounting cavity for mounting the stator core (200b), and a plurality of second grooves are formed on the bottom wall (108b) of the motor housing (100b), and each of the second grooves is distributed along the circumference of the motor housing (100b) to form the housing oil passage (105b); The second groove extends from the inner annular wall (106b) of the motor housing (100b) to the outer annular wall (107b) of the motor housing (100b), so that the second groove is connected to the first oil passage (2041b) and the second oil passage (2051b) respectively.

17. The motor cooling structure according to claim 13, characterized in that: A first metal pressing plate (2021b) is provided in the winding groove (202), and the first metal pressing plate (2021b) is located on a first side of the coil winding (300b) or a second side of the coil winding (300b).

18. The motor cooling structure according to claim 17, characterized in that: The first metal pressure plate (2021b) is arranged on the first side of the coil winding (300b), and the first metal pressure plate (2021b) is tightly attached to the coil winding (300b), the oil groove channel (301b) is formed between the first metal pressure plate (2021b) and the first side surface of the yoke (203b), and a first slot wedge (2022b) is arranged on the second side of the coil winding (300b), and the first slot wedge (2022b) is used to fix the coil winding (300b).

19. The motor cooling structure according to claim 17, characterized in that: The first metal pressure plate (2021b) is arranged on the second side of the coil winding (300b), and the first side of the coil winding (300b) is tightly attached to the first side surface of the yoke (203b), and the oil groove channel (301b) is formed between the first metal pressure plate (2021b) and the rib (1031b) of the sealing plate (103b).

20. The motor cooling structure according to claim 13, characterized in that: The coil winding (300b) comprises a bottom winding (302b) and a top winding (303b), wherein the bottom winding (302b) is in close contact with the first side surface of the yoke (203b), a second slot wedge (2023b) is provided between the top winding (303b) and the convex rib (1031b) of the sealing plate (103b), and the second slot wedge (2023b) is used to fix the top winding (303b), and the oil groove channel (301b) is formed between the bottom winding (302b) and the top winding (303b).

21. The motor cooling structure according to claim 20, characterized in that: Second metal pressing plates (2024b) are respectively fixed to the bottom of the top winding (303) and the top of the bottom winding (302b), and the oil groove channel (301b) is located between the two second metal pressing plates (2024b).

22. The motor cooling structure according to claim 20, characterized in that: The coil winding (300b) is fixed by means of dripping paint, dipping paint or pouring glue.

23. The motor cooling structure according to claim 12, characterized in that: The coil winding (300b) is formed by winding a round copper wire (304b) around the tooth portion (201b); the round copper wire (304b) of each tooth portion (201b) is closely arranged in sequence along the axial direction and radial direction of the tooth portion (201b), and the round copper wires (304b) of adjacent tooth portions (201b) are closely fitted; and an adhesive layer (305b) is provided between each of the round copper wires (304b).

24. The motor cooling structure according to any one of claims 12 to 23, characterized in that: A plurality of flow-blocking components (206b) are evenly distributed along the circumferential direction on the oil passage to allow the coolant to flow in a directional manner.

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