A motor cooling structure

Abstract

This invention discloses a motor cooling structure, relating to the field of motor cooling technology, comprising a motor housing, a stator core, and coil windings; the motor housing is provided with an oil inlet and an oil outlet; the stator core is disposed within the motor housing, forming an oil passage between the stator core and the motor housing; the motor housing is provided with a housing oil passage communicating with the oil passage, and / or the stator core is provided with a core oil passage communicating with the oil passage; an oil groove channel is provided at the axial end of the coil windings, and the oil groove channel communicates with the oil passage channel. The motor cooling structure provided by this invention improves the applicability of oil cooling by placing the oil groove channel at the axial end of the coil windings; by providing channels communicating with the oil passage on the motor housing and stator core, it not only improves the heat dissipation effect of oil cooling but also effectively reduces the pressure drop of the coolant at the inlet and outlet of the motor housing.

Description

Technical Field

[0001] This invention relates to the field of motor cooling technology, and more specifically, to a motor cooling structure. Background Technology

[0002] During normal operation, the coils and stator core of a motor generate heat and transfer it outwards. Insufficient heat dissipation can cause the motor temperature to become excessively high. For the stator, excessive heat can damage the coil insulation, leading to a short circuit and ultimately causing the motor to burn out. To ensure safe and reliable motor operation, a cooling system is needed to dissipate heat. Motor cooling methods mainly include air cooling, water cooling, and oil cooling, with oil cooling offering the best cooling effect among the three.

[0003] In existing technologies, most oil-cooling solutions rely on adjacent flat copper wires forming oil channels within the slots. Whether these channels can flow smoothly and whether the coolant is evenly distributed across the slots largely depends on the manufacturing process of the flat wires. Furthermore, this method of forming oil channels with adjacent copper wires is unsuitable for round copper coils, resulting in poor applicability of oil cooling. Moreover, the heat generated by the stator core is only dissipated through these oil channels, leading to low heat dissipation efficiency for the stator core. This limits the overall cooling effect of oil cooling in motors, impacting overall motor cooling and reducing motor efficiency.

[0004] Furthermore, changing the number of coil turns requires constantly adjusting the flat wire specifications, which increases the overall manufacturing cost of the motor.

[0005] Therefore, how to improve the heat dissipation effect of motor oil cooling has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a motor cooling structure to improve the heat dissipation effect of motor oil cooling.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] An electric motor cooling structure, comprising:

[0009] The motor housing is provided with an oil inlet and an oil outlet.

[0010] A stator core is disposed inside the motor housing, and an oil passage is formed between the stator core and the motor housing. The oil inlet and the oil outlet are respectively connected to the oil passage, and the stator core includes teeth, with winding grooves formed between adjacent teeth.

[0011] The motor housing is provided with a housing oil passage that communicates with the oil passage, and / or the stator core is provided with a core oil passage that communicates with the oil passage;

[0012] A coil winding is sleeved on the toothed 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 passage channel so that coolant flows into the oil groove channel through the oil passage channel to cool and dissipate heat from the coil winding.

[0013] Optionally, in the above-mentioned motor cooling structure, the stator core includes a yoke, the yoke has a first side and a second side disposed opposite to each other, the teeth are connected to the first side of the yoke, the second side of the yoke is in close contact with the motor housing, the coil winding has a first side and a second side disposed opposite to each other, the first side of the coil winding is close to the first side of the yoke, and the core oil passage is disposed on the second side of the yoke.

[0014] The motor housing includes a bottom wall that is close to the second side of the yoke. The housing oil passage is provided on the bottom wall of the motor housing. A sealing plate is provided inside the motor housing. The sealing plate is located on the second side of the coil winding. The sealing plate is uniformly provided with a plurality of raised ribs along the circumferential direction. The raised ribs correspond to the winding groove.

[0015] Optionally, in the above-described 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 passage includes a first oil passage and a second oil passage. The first oil passage is located on one side of the inner ring end face of the stator core, and the second oil passage is located on one side of the outer ring end face of the stator core. The oil groove passage is connected to the first oil passage and the second oil passage respectively, and the oil inlet and the oil outlet are connected to the second oil passage respectively.

[0016] Optionally, in the above-mentioned motor cooling structure, a plurality of first grooves are provided on the second side of the yoke, and each of the first grooves is distributed along the circumference of the stator core to form the oil passage of the core.

[0017] The first groove extends from the inner ring end face of the stator core to the outer ring end face of the stator core, so that the first groove is connected to the first oil passage and the second oil passage respectively.

[0018] Optionally, in the above-mentioned motor cooling structure, the motor housing includes an inner ring wall and an outer ring wall disposed opposite to each other, and the inner ring wall, the outer ring wall and the bottom wall surround to form an installation cavity for installing the stator core. A plurality of second grooves are provided on the bottom wall of the motor housing, and each of the second grooves is distributed along the circumference of the motor housing to form the housing oil passage.

[0019] The second groove extends from the inner ring wall of the motor housing to the outer ring wall of the motor housing, so that the second groove communicates with the first oil passage and the second oil passage respectively.

[0020] Optionally, in the above-described motor cooling structure, a first metal pressure plate is provided in the winding groove, and the first metal pressure plate is located on the first side of the coil winding or the second side of the coil winding.

[0021] Optionally, in the above-described motor cooling structure, the first metal pressure plate is disposed on the first side of the coil winding and is in close contact with the coil winding. The oil groove channel is formed between the first metal pressure plate and the first side of the yoke. A first slot wedge is disposed on the second side of the coil winding, and the first slot wedge is used to fix the coil winding.

[0022] Optionally, in the above-described motor cooling structure, the first metal pressure plate is disposed on the second side of the coil winding, and the first side of the coil winding is in close contact with the first side of the yoke, and the oil groove channel is formed between the first metal pressure plate and the rib of the sealing plate.

[0023] Optionally, in the above-mentioned motor cooling structure, the coil winding includes a bottom winding and a top winding. The bottom winding is in close contact with the first side of the yoke. 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 groove channel is formed between the bottom winding and the top winding.

[0024] Optionally, in the above-mentioned motor cooling structure, a second metal pressure plate is fixed to the bottom of the top layer winding and the top of the bottom layer winding, and the oil groove channel is located between the two second metal pressure plates.

[0025] Optionally, in the above-mentioned motor cooling structure, the coil winding is fixed by dripping varnish, impregnation with varnish, or potting glue.

[0026] Optionally, in the above-mentioned motor cooling structure, the coil winding is formed by winding round copper wire around the tooth portion, and the round copper wire of each tooth portion is arranged closely along the axial and radial directions of the tooth portion, and the round copper wires of adjacent teeth portions are closely attached, and an adhesive layer is provided between each round copper wire.

[0027] Optionally, in the above-mentioned motor cooling structure, multiple flow-blocking elements are evenly distributed along the circumference of the oil passage to allow the coolant to flow in a directional manner.

[0028] The motor cooling structure provided by this invention features an oil inlet and an oil outlet on the motor housing, with the stator core housed within the housing and forming an oil passage between it and the housing. The oil inlet and outlet are connected to this oil passage. A coil winding is fitted onto the teeth of the stator core, positioned within a winding slot formed between adjacent teeth. An oil groove channel is located within this winding slot, at the axial end of the coil winding. This oil groove channel connects to the oil passage, allowing coolant to enter the oil passage channel from the oil inlet on the motor housing, flow into the oil groove channel, and cool the coil winding within the winding slot. Finally, the coolant exits from the oil outlet on the motor housing, thus achieving heat dissipation for the coil winding. Meanwhile, a housing oil passage connected to the oil passage can be provided on the motor housing, allowing coolant to flow into the housing oil passage from the oil passage, thereby improving the heat dissipation effect of the motor housing and stator core. Alternatively, a core oil passage connected to the oil passage can be provided on the stator core, allowing coolant to flow into the core oil passage from the oil passage, thereby increasing the contact area between the coolant and the stator core and improving the heat dissipation efficiency of the stator core.

[0029] Compared with existing technologies, the motor cooling structure provided by this invention, by setting the oil groove channel at the axial end of the coil winding, eliminates the need for oil passages formed between adjacent flat copper wires. The oil groove channel is located within the winding slot and is connected to the oil passage channel, allowing coolant to enter the oil passage channel from the oil inlet of the motor housing, flow into the oil groove channel through the oil passage channel, cool the coil winding within the winding slot, and finally flow out from the oil outlet of the motor housing, thus achieving heat dissipation for the coil winding. By forming the oil groove channel in the axial direction of the coil winding, the coil winding is not limited to flat copper wire but can also be used with round copper wire, thereby realizing oil cooling and improving the applicability of the oil cooling method. Simultaneously, by setting the housing oil passage channel on the motor housing and the core oil passage channel on the stator core, not only is the heat dissipation effect of the motor oil cooling method improved, but the pressure drop of the coolant at the oil inlet and outlet of the motor housing is also effectively reduced. Furthermore, when changing the number of coil turns, the round copper wire does not need to be adjusted in specifications like the flat copper wire, and the manufacturing cost of the motor coil does not increase. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0031] Figure 1 This is an exploded view of the motor cooling structure provided in Embodiment 1 of the present invention;

[0032] Figure 2 This is a schematic diagram of the motor cooling structure provided in Embodiment 1 of the present invention;

[0033] Figure 3 This is a schematic diagram of the oil passage structure in the tank provided in Embodiment 1 of the present invention;

[0034] Figure 4 This is a schematic diagram of the oil passage structure in the tank provided in Embodiment 2 of the present invention;

[0035] Figure 5 This is a schematic diagram of the oil passage in the tank provided in Embodiment 3 of the present invention;

[0036] Figure 6 This is a schematic diagram of the oil passage in the tank provided in Embodiment 4 of the present invention;

[0037] Figure 7 This is a schematic diagram of the stator core structure provided in Embodiment 1 of the present invention;

[0038] Figure 8 This is a schematic diagram of the structure of the motor housing provided in Embodiment 1 of the present invention;

[0039] Figure 9 This is a schematic diagram of the coil winding arrangement provided in an embodiment of the present invention.

[0040] Among them, 100 is the motor housing, 101 is the oil inlet, 102 is the oil outlet, 103 is the sealing plate, 1031 is the rib, 104 is the motor shaft, 105 is the housing oil passage, 106 is the inner ring wall, 107 is the outer ring wall, and 108 is the bottom wall.

[0041] 200 is the stator core, 201 is the tooth section, 202 is the winding slot, 2021 is the first metal pressure plate, 2022 is the first slot wedge, 2023 is the second slot wedge, 2024 is the second metal pressure plate, 203 is the yoke section, 2031 is the core oil passage, 204 is the inner ring end face, 2041 is the first oil passage, 205 is the outer ring end face, 2051 is the second oil passage, and 206 is the flow obstruction component;

[0042] 300 is the coil winding, 301 is the oil groove channel, 302 is the bottom winding, 303 is the top winding, 304 is the round copper wire, and 305 is the adhesive layer. Detailed Implementation

[0043] The core of this invention lies in providing a self-locking electrical connection structure to improve the heat dissipation effect of motor oil cooling.

[0044] Another core aspect of this invention is to provide a high-voltage switchgear having the aforementioned self-locking electrical connection structure.

[0045] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0046] like Figure 1As shown, this invention discloses a motor cooling structure, including a motor housing 100, a stator core 200, and a coil winding 300. It should be noted that in the prior art, most oil cooling solutions rely on adjacent flat copper wires forming oil channels within slots. Whether the oil channels can flow normally, and whether the coolant is evenly distributed in each slot, largely depends on the manufacturing process of the flat wires. Furthermore, the method of forming oil channels with adjacent copper wires within slots cannot be applied to round copper coils, resulting in poor applicability of oil cooling. Moreover, the heat generated by the stator core is only dissipated and cooled through the oil channels formed by adjacent flat copper wires within slots, leading to low heat dissipation efficiency of the stator core. This limits the heat dissipation effect of the motor's oil cooling method, affecting the overall heat dissipation of the motor and reducing its operating efficiency. In addition, changing the number of coil turns requires continuous adjustment of the flat wire specifications, increasing the overall manufacturing cost of the motor. The motor cooling structure disclosed in this invention, by placing the oil groove channel 301 at the axial end of the coil winding 300, eliminates the need for an oil passage formed between adjacent flat copper wires. The oil groove channel 301 is located within the winding slot 202 and communicates with the oil passage, allowing coolant to enter the oil passage from the oil inlet 101 of the motor housing 100 and flow into the oil groove channel 301 through the oil passage to cool the coil winding 300 within the winding slot 202. Finally, the coolant flows out from the oil outlet 102 of the motor housing 100, thus achieving heat dissipation for the coil winding 300. By forming the oil groove channel 301 in the axial direction of the coil winding 300, the coil winding 300 is not limited to flat copper wire but can also be used with round copper wire, thereby realizing an oil-cooled heat dissipation method and improving the applicability of the oil cooling method. Meanwhile, by providing a housing oil passage 105 on the motor housing 100 and a core oil passage 2031 on the stator core 200, not only is the heat dissipation effect of the motor oil cooling method improved, but the pressure drop of the coolant at the oil inlet 101 and oil outlet 102 on the motor housing 100 is also effectively reduced. Furthermore, when changing the number of coil turns, round copper wire does not require specification adjustment like flat copper wire, thus not increasing the manufacturing cost of the motor coil.

[0047] Among them, such as Figure 1 and Figure 2 As shown, the motor housing 100 is provided with an oil inlet 101 and an oil outlet 102, so that coolant enters the motor housing 100 through the oil inlet 101 and flows out through the oil outlet 102, thereby dissipating heat and cooling the stator core 200 and coil winding 300 inside the motor housing 100. It should be noted that, unless otherwise specified, in this application, cooling oil is used as the coolant to achieve oil cooling.

[0048] like Figure 1 and Figure 2As shown, the stator core 200 is disposed within the motor housing 100, and an oil passage is formed between the stator core 200 and the motor housing 100. The oil inlet 101 and oil outlet 102 are respectively connected to the oil passage. The stator core 200 includes teeth 201, and winding slots 202 are formed between adjacent teeth 201. The coil winding 300 is fitted onto the teeth 201 so that the coil winding 300 is located within the winding slots 202. Furthermore, as... Figure 2 As shown, an oil groove channel 301 is provided within the winding groove 202, and the oil groove channel 301 is located at the axial end of the coil winding 300, i.e., the end face of the coil winding 300 in the axial direction. The oil groove channel 301 is connected to an oil passage channel, allowing coolant to flow into the oil groove channel 301 through the oil passage channel to cool the coil winding 300. When coolant enters the oil passage channel from the oil inlet 101 of the motor housing 100 and flows into the oil groove channel 301, it cools the coil winding 300 within the winding groove 202, and finally flows out from the oil outlet 102 of the motor housing 100, thus achieving the effect of heat dissipation for the coil winding 300. By forming the oil groove channel 301 in the axial direction of the coil winding 300, the coil winding 300 is not limited to flat copper wire but can also be used with round copper wire, thereby realizing an oil-cooled heat dissipation method and improving the applicability of the oil cooling method. Furthermore, when changing the number of coil turns, round copper wire does not require specification adjustments like flat copper wire, so the manufacturing cost of the motor coil does not increase.

[0049] At the same time, such as Figure 7 and Figure 8 As shown, a housing oil passage 105 communicating with an oil passage is provided on the motor housing 100, allowing coolant to flow into the housing oil passage 105, thereby improving the heat dissipation effect of the motor housing 100 and the stator core 200. Alternatively, a core oil passage 2031 communicating with an oil passage can be provided on the stator core 200, allowing coolant to flow into the core oil passage 2031, increasing the contact area between the coolant and the stator core 200, and improving the heat dissipation efficiency of the stator core 200. Of course, a housing oil passage 105 can also be provided on the motor housing 100, and a core oil passage 2031 can be provided on the stator core 200, thereby increasing the contact area between the coolant and the stator core 200. By providing a housing oil passage 105 on the motor housing 100 and a core oil passage 2031 on the stator core 200, the heat dissipation effect of the motor oil cooling method is not only improved, but the pressure drop of the coolant at the oil inlet 101 and oil outlet 102 on the motor housing 100 can also be effectively reduced.

[0050] Furthermore, such as Figure 1 and Figure 7As shown, the stator core 200 includes a yoke 203, and the yoke 203 has two opposing sides. For ease of understanding, the two sides of the yoke 203 are defined as the first side and the second side, respectively. The teeth 201 of the stator core 200 are connected to the first side of the yoke 203, and the second side of the yoke 203 is in close contact with the motor housing 100. Meanwhile, the core oil passage 2031 is provided on the second side of the yoke 203. Furthermore, the coil winding 300 has a first side and a second side opposing to each other, wherein the first side of the coil winding 300 is close to the first side of the yoke 203, and the second side of the coil winding 300 is away from the yoke 203 of the stator core 200. Also, as... Figure 1 and Figure 8 As shown, the motor housing 100 includes a bottom wall 108 that is tightly fitted to the second side of the yoke 203, and the housing oil passage 105 is disposed on the bottom wall 108 of the motor housing 100. A sealing plate 103 is disposed inside the motor housing 100, located on the second side of the coil winding 300. The sealing plate 103 has a plurality of ribs 1031 evenly distributed along the circumferential direction, and the ribs 1031 correspond to the winding grooves 202. Specifically, the sealing plate 103 has a first side and a second side disposed opposite to each other, and the ribs 1031 are disposed on the first side of the sealing plate 103 to improve the rigidity of the sealing plate 103. Meanwhile, the second side of the sealing plate 103 is the surface in contact with the air gap, which is the gap between the stator and the rotor. The second side of the sealing plate 103 is a smooth plane, reducing the coefficient of friction and effectively reducing the losses caused by friction between the rotor and air during rotation, thereby reducing the temperature rise of the magnets and improving motor efficiency.

[0051] Furthermore, combined Figure 1 , Figure 2 and Figure 8It is understood that the motor housing 100 includes an inner ring wall 106 and an outer ring wall 107 disposed opposite to each other, and the inner ring wall 106, the outer ring wall 107 and the bottom wall 108 surround to form a mounting cavity for mounting the stator core 200. The stator core 200 has an inner ring end face 204 and an outer ring end face 205 disposed opposite to each other, wherein the inner ring end face 204 is the end face close to the motor shaft 104, and the outer ring end face 205 is the end face away from the motor shaft 104, and the stator core 200 is sleeved on the outside of the inner ring wall 106 of the motor housing 100, so that the inner ring wall 106 of the motor housing 100 is located inside the inner ring end face 204 of the stator core 200, while the outer ring wall 107 of the motor housing 100 is located outside the outer ring end face 205 of the stator core 200. The oil passage includes a first oil passage 2041 and a second oil passage 2051. The first oil passage 2041 is located on one side of the inner ring end face 204 of the stator core 200, that is, between the inner ring end face 204 of the stator core 200 and the inner ring wall 106 of the motor housing 100. The second oil passage 2051 is located on one side of the outer ring end face 205 of the stator core 200, that is, between the outer ring end face 205 of the stator core 200 and the outer ring wall 107 of the motor housing 100. The oil groove passage 301 is connected to the first oil passage 2041 and the second oil passage 2051 respectively. The oil inlet 101 and the oil outlet 102 are connected to the second oil passage 2051 respectively.

[0052] Furthermore, such as Figure 7 As shown, in a specific embodiment, a plurality of first grooves are provided on the second side of the yoke 203, and each first groove is distributed along the circumference of the stator core 200 to form an oil passage 2031 for the core. Specifically, the first groove is an elongated groove, and the first groove extends from the inner ring end face 204 of the stator core 200 to the outer ring end face 205 of the stator core 200, so that the first groove is connected to the first oil passage 2041 and the second oil passage 2051 respectively, thereby ensuring that the coolant can circulate between the first oil passage 2041, the core oil passage 2031 and the second oil passage 2051, increasing the contact area between the coolant and the stator core 200, improving the heat dissipation efficiency of the stator core 200, and effectively reducing the pressure drop of the coolant at the oil inlet 101 and the oil outlet 102 on the motor housing 100. 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 200, and each annular groove is connected to the other through the long strip groove, thereby increasing the contact area between the coolant and the stator core 200 and improving the heat dissipation effect of the motor oil cooling method.

[0053] Furthermore, such as Figure 8As shown, in a specific embodiment, a plurality of second grooves are formed on the bottom wall 108 of the motor housing 100, and each second groove is distributed along the circumference of the motor housing 100 to form a housing oil passage 105. Specifically, the second groove is an elongated groove, and the second groove extends from the inner ring wall 106 of the motor housing 100 to the outer ring wall 107 of the motor housing 100, so that the second groove is connected to the first oil passage 2041 and the second oil passage 2051 respectively, thereby ensuring that the coolant can circulate between the first oil passage 2041, the housing oil passage 105 and the second oil passage 2051, increasing the contact area between the coolant and the motor housing 100 and the stator core 200, improving the heat dissipation efficiency of the stator core 200, and effectively reducing the pressure drop of the coolant at the oil inlet 101 and the oil outlet 102 on the motor housing 100. 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 100, and each annular groove is interconnected through the long strip groove, thereby increasing the contact area between the coolant and the motor housing 100 and the stator core 200, and improving the heat dissipation effect of the motor oil cooling method.

[0054] In addition, such as Figure 2As shown, to ensure the directional flow of coolant, multiple flow-blocking components 206 are provided on the oil passage, and each flow-blocking component 206 has a socket for insertion into the protruding part of the protruding tooth 201 of the coil winding 300. This allows the flow-blocking component 206 to better fit the coil winding 300, and it is fixed with adhesive. Specifically, for ease of understanding, the flow-blocking component 206 provided in the first oil passage 2041 is defined as the first flow-blocking component, and the flow-blocking component 206 provided in the second oil passage 2051 is defined as the second flow-blocking component. Meanwhile, the teeth 201 of the stator core 200 have a proximal end and a distal end that are arranged opposite to each other. The proximal end of the teeth 201 is the end that is close to the motor shaft 104, and the distal end of the teeth 201 is the end that is far away from the motor shaft 104. Furthermore, the first flow-blocking member is inserted into the protrusion of the coil winding 300 protruding from the proximal end of the teeth 201 through a socket to prevent the coolant from flowing along the first oil passage 2041. This ensures that the coolant flows from the first oil passage 2041 to the oil sump passage 301, and from the oil sump passage 301 to the second oil passage 2051, thereby achieving the directional flow effect of the coolant from the first oil passage 2041 through the oil sump passage 301 to the second oil passage 2051. Similarly, the second flow-blocking component is inserted into the protrusion at the distal end of the protruding tooth 201 of the coil winding 300 via a socket to prevent coolant from flowing along the second oil passage 2051. This ensures that the coolant flows from the second oil passage 2051 to the oil sump passage 301, and then from the oil sump passage 301 to the first oil passage 2041, thereby achieving a directional flow effect of coolant from the second oil passage 2051 through the oil sump passage 301 to the first oil passage 2041. It should be noted that... Figure 2 The arrows in the diagram indicate the direction of coolant flow.

[0055] Among them, such as Figure 2As shown, in one specific embodiment, there are three first flow-blocking elements and four second flow-blocking elements. To ensure the coolant is evenly distributed within the oil tank channels 301 and to guarantee the normal flow of the entire oil cooling circulation loop, the first and second flow-blocking elements are alternately arranged circumferentially, meaning one first or second flow-blocking element is installed every three oil tank channels 301. This achieves alternating flow of coolant with three inlets and three outlets, ultimately flowing out through the oil outlet 102 on the motor housing 100. Of course, the number of first and second flow-blocking elements is not limited to the above embodiment, nor is the arrangement limited to the above embodiments. For example, there could be four first flow-blocking elements and three second flow-blocking elements, etc. The specific implementation method is similar to the above embodiment, and will not be repeated here. It should be noted that in the above embodiments, the three-way entry of coolant refers to the coolant entering the first oil passage 2041 from the second oil passage 2051 through three adjacent oil tank passages 301; the three-way exit of coolant refers to the coolant flowing out from the first oil passage 2041 through three adjacent oil tank passages 301 to the second oil passage 2051.

[0056] It should be noted that the flow-blocking component 206 not only prevents the coolant from flowing along the oil passage, ensuring that the coolant circulates between the oil tank passage 301 and the oil passage in a predetermined direction, but also ensures that the coolant circulates between the oil passage, the iron core oil passage 2031, and the housing oil passage 105 in a predetermined direction. This forms a cooling circulation loop with both inlet and outlet between the motor housing 100 and the stator iron core 200, and finally discharges from the oil outlet 102 on the motor housing 100, thereby achieving the effect of cooling and heat dissipation for the motor housing 100 and the stator iron core 200.

[0057] The motor cooling structure disclosed in this embodiment of the invention provides an oil inlet 101 and an oil outlet 102 on the motor housing 100, and the stator core 200 is disposed inside the motor housing 100, forming an oil passage between the stator core 200 and the motor housing 100. The oil inlet 101 and the oil outlet 102 are respectively connected to the oil passage. Meanwhile, the coil winding 300 is fitted onto the teeth 201 of the stator core 200 so that the coil winding 300 is located in the winding groove 202 formed between adjacent teeth 201. An oil groove channel 301 is provided in the winding groove 202. The oil groove channel 301 is located at the axial end of the coil winding 300 and is connected to the oil passage so that coolant enters the oil passage from the oil inlet 101 of the motor housing 100 and flows into the oil groove channel 301 through the oil passage to cool the coil winding 300 in the winding groove 202. Finally, it flows out from the oil outlet 102 of the motor housing 100, thereby achieving the effect of heat dissipation for the coil winding 300. Meanwhile, a housing oil passage 105 communicating with the oil passage can be provided on the motor housing 100, so that the coolant flows into the housing oil passage 105 from the oil passage, thereby improving the heat dissipation effect of the motor housing 100 and the stator core 200. Alternatively, a core oil passage 2031 communicating with the oil passage can be provided on the stator core 200, so that the coolant flows into the core oil passage 2031 from the oil passage, thereby increasing the contact area between the coolant and the stator core 200 and improving the heat dissipation efficiency of the stator core 200.

[0058] Compared with the prior art, the motor cooling structure disclosed in this embodiment of the invention, by setting the oil groove channel 301 at the axial end position of the coil winding 300, eliminates the need for an oil passage formed between adjacent flat copper wires. Furthermore, the oil groove channel 301 is located within the winding slot 202 and is connected to the oil passage channel, allowing coolant to enter the oil passage channel from the oil inlet 101 of the motor housing 100 and flow into the oil groove channel 301 through the oil passage channel to cool the coil winding 300 within the winding slot 202. Finally, the coolant flows out from the oil outlet 102 of the motor housing 100, thereby achieving the effect of heat dissipation for the coil winding 300. By forming the oil groove channel 301 in the axial direction of the coil winding 300, the coil winding 300 is not limited to flat copper wire but can also be used with round copper wire, thus realizing an oil-cooled heat dissipation method and improving the applicability of the oil cooling method. Meanwhile, by providing a housing oil passage 105 on the motor housing 100 and a core oil passage 2031 on the stator core 200, not only is the heat dissipation effect of the motor oil cooling method improved, but the pressure drop of the coolant at the oil inlet 101 and oil outlet 102 on the motor housing 100 is also effectively reduced. Furthermore, when changing the number of coil turns, round copper wire does not require specification adjustment like flat copper wire, thus not increasing the manufacturing cost of the motor coil.

[0059] Furthermore, such as Figure 3 and Figure 4As shown, in one specific embodiment, a first metal pressure plate 2021 is provided in the winding groove 202, and the first metal pressure plate 2021 is located on the first side or the second side of the coil winding 300. Specifically, as shown... Figure 3 As shown, the coil winding 300 is first fitted onto the toothed portion 201 of the stator core 200, ensuring that the first side of the coil winding 300 is in close contact with the first side of the yoke portion 203 of the stator core 200. Simultaneously, a first metal pressure plate 2021 is pressed into the second side of the coil winding 300, forming an oil groove channel 301 between the first metal pressure plate 2021 and the protruding rib 1031 of the sealing plate 103. This allows coolant to flow into the oil groove channel 301 to dissipate heat from the coil winding 300. By placing the first metal pressure plate 2021 on the second side of the coil winding 300, it acts as a slot wedge, fixing the coil winding 300 within the winding slot 202. Furthermore, it allows for better heat transfer from the coil winding 300 to the coolant within the oil groove channel 301, improving heat dissipation efficiency.

[0060] Of course, such as Figure 4 As shown, the first metal pressure plate 2021 can also be disposed on the first side of the coil winding 300, and the first metal pressure plate 2021 is in close contact with the coil winding 300 to form an oil groove channel 301 between the first metal pressure plate 2021 and the first side of the yoke 203 of the stator core 200. In order to fix the coil winding 300, a first slot wedge 2022 is provided on the second side of the coil winding 300, and there is a certain gap between the first slot wedge 2022 and the protruding rib 1031 of the sealing plate 103, which can prevent the force on the coil winding 300 during motor operation from being transmitted to the sealing plate 103 through the first slot wedge 2022, thereby reducing the sealing effect. By disposing of the first metal pressure plate 2021 on the first side of the coil winding 300, the eddy current loss of the first metal pressure plate 2021 can be reduced, and the contact area between the coolant and the stator core 200 can be increased, thereby improving the heat dissipation effect of the motor.

[0061] like Figure 5As shown, in another specific embodiment, the coil winding 300 includes a bottom winding 302 and a top winding 303. The bottom winding 302 is tightly attached to the first side of the yoke 203 of the stator core 200. A second slot wedge 2023 is provided between the top winding 303 and the rib 1031 of the sealing plate 103 to fix the top winding 303. A certain gap exists between the second slot wedge 2023 and the rib 1031 of the sealing plate 103 to prevent the force on the coil winding 300 during motor operation from being transmitted to the sealing plate 103 through the second slot wedge 2023, thus preventing a reduction in the sealing effect. Simultaneously, an oil groove channel 301 is formed between the bottom winding 302 and the top winding 303. In this embodiment, the bottom winding 302 and the top winding 303 can be fixed by dripping varnish, impregnation, or potting glue. By forming an oil groove channel 301 between the bottom winding 302 and the top winding 303, the coolant can directly contact the coil winding 300, thereby achieving the best heat dissipation effect and improving the motor slot fill factor. However, the fixing process of the coil winding 300 is relatively complex.

[0062] Furthermore, such as Figure 9 As shown, the coil winding 300 uses round copper wire 304, and the coil winding 300 is formed by winding the round copper wire 304 around the tooth portion 201. Specifically, the round copper wire 304 of each tooth portion 201 is arranged closely along the axial and radial directions of the tooth portion 201, and the round copper wire 304 of adjacent teeth portions 201 are tightly fitted together. In this embodiment, as... Figure 9 As shown, the round copper wires 304 located in the same winding groove 202 are arranged horizontally. Figure 9 The number of teeth (view angle) is 10 radially along the tooth section 201, arranged longitudinally ( Figure 9 The number of teeth (view angle) along the axial direction of the tooth 201 is 12, and when the oil groove channel 301 is located between the bottom winding 302 and the top winding 303, the bottom winding 302 and the top winding 303 are arranged longitudinally ( Figure 9 The number of (angles) can be 6 each, to fully utilize the space within the winding slot 202, thereby increasing the motor slot fill factor. Meanwhile, as... Figure 9 As shown, an adhesive layer 305 is provided between each round copper wire 304. In this embodiment, the adhesive layer 305 is formed between each round copper wire 304 through a potting process, so that the round copper wires 304 are bonded and fixed together.

[0063] Of course, such as Figure 6As shown, to reduce the difficulty of fixing the coil winding 300, second metal pressure plates 2024 are fixed at the bottom of the top layer winding 303 and the top of the bottom layer winding 302, forming an oil groove channel 301 between the two second metal pressure plates 2024. By setting two second metal pressure plates 2024 and positioning the oil groove channel 301 in the middle region of the coil winding 300, the coil winding 300 is divided into two parts: the bottom layer winding 302 and the top layer winding 303. This reduces the difficulty of fixing the coil winding 300 while improving the heat dissipation effect of the motor.

[0064] The terms "first" and "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units may include steps or units not listed, but rather steps or units not listed.

[0065] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those 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 invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A motor cooling structure, characterized in that, include: The motor housing (100) is provided with an oil inlet (101) and an oil outlet (102). A stator core (200) is disposed inside a motor housing (100). An oil passage is formed between the stator core (200) and the motor housing (100). The oil inlet (101) and the oil outlet (102) are respectively connected to the oil passage. The stator core (200) includes teeth (201), and a winding groove (202) is formed between adjacent teeth (201). The motor housing (100) is provided with a housing oil passage (105) that communicates with the oil passage, and / or the stator core (200) is provided with a core oil passage (2031) that communicates with the oil passage. A coil winding (300) is sleeved on the toothed portion (201) so that the coil winding (300) is located in the winding groove (202). An oil groove channel (301) is provided in the winding groove (202), and the oil groove channel (301) is located at the axial end of the coil winding (300). The oil groove channel (301) is connected to the oil passage channel so that coolant flows into the oil groove channel (301) through the oil passage channel to cool and dissipate heat from the coil winding (300). The stator core (200) includes a yoke (203), which has a first side and a second side arranged opposite to each other. The tooth (201) is connected to the first side of the yoke (203), and the second side of the yoke (203) is close to the motor housing (100). The coil winding (300) has a first side and a second side arranged opposite to each other. The first side of the coil winding (300) is close to the first side of the yoke (203), and the core oil passage (2031) is located on the second side of the yoke (203). The motor housing (100) includes a bottom wall (108) that is close to the second side of the yoke (203). The housing oil passage (105) is provided on the bottom wall (108) of the motor housing (100). A sealing plate (103) is provided inside the motor housing (100). The sealing plate (103) is located on the second side of the coil winding (300). The sealing plate (103) is uniformly provided with a plurality of ribs (1031) in the circumferential direction. The ribs (1031) correspond to the winding groove (202).

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

3. The motor cooling structure according to claim 2, characterized in that, The second side of the yoke (203) is provided with a plurality of first grooves, and each of the first grooves is distributed along the circumference of the stator core (200) to form the core oil passage (2031). The first groove extends from the inner ring end face (204) of the stator core (200) to the outer ring end face (205) of the stator core (200), so that the first groove is connected to the first oil passage (2041) and the second oil passage (2051) respectively.

4. The motor cooling structure according to claim 2, characterized in that, The motor housing (100) includes an inner ring wall (106) and an outer ring wall (107) disposed opposite to each other, and the inner ring wall (106), the outer ring wall (107) and the bottom wall (108) surround to form a mounting cavity for mounting the stator core (200). The bottom wall (108) of the motor housing (100) is provided with a plurality of second grooves, and each second groove is distributed along the circumference of the motor housing (100) to form the housing oil passage (105). The second groove extends from the inner ring wall (106) of the motor housing (100) to the outer ring wall (107) of the motor housing (100), so that the second groove communicates with the first oil passage (2041) and the second oil passage (2051) respectively.

5. The motor cooling structure according to claim 1, characterized in that, A first metal pressure plate (2021) is provided in the winding groove (202), and the first metal pressure plate (2021) is located on the first side of the coil winding (300) or the second side of the coil winding (300).

6. The motor cooling structure according to claim 5, characterized in that, The first metal pressure plate (2021) is disposed on the first side of the coil winding (300), and the first metal pressure plate (2021) is in close contact with the coil winding (300). The oil groove channel (301) is formed between the first metal pressure plate (2021) and the first side of the yoke (203). A first slot wedge (2022) is disposed on the second side of the coil winding (300), and the first slot wedge (2022) is used to fix the coil winding (300).

7. The motor cooling structure according to claim 5, characterized in that, The first metal pressure plate (2021) is disposed on the second side of the coil winding (300), and the first side of the coil winding (300) is in close contact with the first side of the yoke (203). The oil groove channel (301) is formed between the first metal pressure plate (2021) and the rib (1031) of the sealing plate (103).

8. The motor cooling structure according to claim 1, characterized in that, The coil winding (300) includes a bottom winding (302) and a top winding (303). The bottom winding (302) is close to the first side of the yoke (203). A second slot wedge (2023) is provided between the top winding (303) and the rib (1031) of the sealing plate (103). The second slot wedge (2023) is used to fix the top winding (303). The oil groove channel (301) is formed between the bottom winding (302) and the top winding (303).

9. The motor cooling structure according to claim 8, characterized in that, The bottom of the top winding (303) and the top of the bottom winding (302) are respectively fixed with second metal pressure plates (2024), and the oil groove channel (301) is located between the two second metal pressure plates (2024).

10. The motor cooling structure according to claim 8, characterized in that, The coil winding (300) is fixed by dripping varnish, impregnation with varnish or potting glue.

11. The motor cooling structure according to claim 1, characterized in that, The coil winding (300) is formed by winding round copper wire (304) around the tooth (201). The round copper wire (304) of each tooth (201) is arranged closely along the axial and radial directions of the tooth (201), and the round copper wire (304) of adjacent teeth (201) are tightly attached. An adhesive layer (305) is provided between each round copper wire (304).

12. The motor cooling structure according to any one of claims 1 to 11, characterized in that, Multiple flow-blocking elements (206) are evenly distributed along the circumference of the oil passage to allow the coolant to flow in a directional manner.

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