Oil-cooled flat wire motor heat dissipation structure and motor

Abstract

The application provides an oil cooling flat wire motor heat dissipation structure and motor. The heat dissipation structure is provided with oil injection ports on the side close to the stator winding. There are at least two groups of oil injection ports, and the multiple groups of oil injection ports are arranged along the axial direction of the stator winding. In the multiple groups of oil injection ports, at least one group of oil injection ports corresponds to the position of the end part of the stator winding, and at least one group of oil injection ports corresponds to the position of the end part of the stator winding close to the stator core. The cooling medium is sprayed to the position of the end part of the stator winding and the end part of the stator winding close to the stator core, so that the cooling medium flows along the direction from the end part of the stator winding to the stator core and the direction from the position of the end part of the stator winding close to the stator core to the end part of the stator winding, and flows through the inner layer of the stator winding. The beneficial effect of the application is that, under the influence of the shape of the stator winding and the gravity of the cooling medium, the cooling medium changes from random flow to directional flow, the contact area of the cooling medium and the stator winding is increased, and the heat dissipation performance of the motor is improved.

Description

Technical Field

[0001] This invention belongs to the field of motor technology, and in particular relates to a heat dissipation structure and motor for an oil-cooled flat wire motor. Background Technology

[0002] In recent years, new energy vehicles have developed rapidly. Major automobile and parts manufacturers are developing new energy vehicles and their supporting facilities to meet market demands. As one of the core components, the motor has begun to be integrated with the gearbox or controller. With the increasing power density requirements, the heat dissipation problem has become more important, whether it is a whole or a single motor. Therefore, there are higher requirements for cooling methods.

[0003] Currently, heat dissipation for similar integrated structure motors mainly adopts oil cooling at the stator ends and the middle of the stator core, with the rotor discharging oil to both sides of the stator ends. This approach is more suitable for distributed winding stators. For concentrated winding stators, this method has limitations in heat dissipation due to the shorter ends, more dispersed end structures, and larger gaps.

[0004] During motor operation, the main heat-generating component is the stator coil. When alternating current passes through it, the stator coil generates a rotating magnetic field, which interacts with the rotor's magnetic field to produce electromagnetic torque, thus causing the motor to rotate. Therefore, temperature rise control of the stator coil becomes very important. Summary of the Invention

[0005] In view of the above problems, the present invention provides a heat dissipation structure and motor for an oil-cooled flat wire motor, so as to solve the above or other problems existing in the prior art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an oil-cooled flat wire motor heat dissipation structure, corresponding to any end of the stator core, wherein the heat dissipation structure is provided with an oil spray port on the side near the stator winding, and there are at least two sets of oil spray ports, with multiple sets of oil spray ports arranged along the axial direction of the stator winding; among the multiple sets of oil spray ports, at least one set of oil spray ports corresponds to the end position of the stator winding, and at least one set of oil spray ports corresponds to the end position of the stator winding near the stator core, so that the cooling medium is sprayed to the end of the stator winding and the position near the end of the stator core, and the cooling medium flows along the direction from the end of the stator winding to the stator core and from the position near the end of the stator core to the end of the stator winding, and flows through the inner layer of the stator winding.

[0007] Furthermore, a set of oil nozzles located at the end of the stator winding corresponds to the position of the bend protrusion of the conductor insertion end in the stator winding, and a set of oil nozzles located near the end of the stator core corresponds to the position of the bend recess of the conductor insertion end in the stator winding.

[0008] Furthermore, each injection port is configured to correspond to the position of a set of conductors, such that each set of conductors is sprayed with cooling medium that flows along the surface of the conductors.

[0009] Furthermore, the oil injection port corresponds to the injection position of the stator winding. The injection position is the outer surface of the end of each set of conductors in the stator winding and the outer surface of each set of conductors in the stator winding near the end of the stator core, so that the cooling medium flows along the surface of the conductors of the stator winding and flows radially along the stator winding.

[0010] Furthermore, multiple oil injection ports in each group are arranged along the circumference of the stator core, and the projection areas of two adjacent groups of oil injection ports on the stator winding are arranged adjacently, with the two adjacent groups of oil injection ports on different circumferences.

[0011] Furthermore, within each group of fuel injectors, multiple fuel injectors are not equidistantly spaced.

[0012] Furthermore, the heat dissipation structure also includes:

[0013] The oil pipe body has an internal cavity, and the oil injection port is connected to the internal cavity of the oil pipe body to facilitate the flow of cooling medium.

[0014] The oil inlet is connected to the oil pipe body and communicates with the internal cavity of the oil pipe body to facilitate the entry of the cooling medium into the oil pipe body.

[0015] Furthermore, the oil pipe body has an arc-shaped structure, or there are multiple oil pipe bodies arranged in an arc shape with the axis of the stator winding as the center.

[0016] Furthermore, a baffle is provided inside the oil pipe body. The baffle is located between adjacent oil injection ports, and the adjacent baffles form a receiving space to distribute the cooling medium to each oil injection port.

[0017] Furthermore, the spoiler is arranged to intersect the axis of the fuel injector, and the distance between the free end of the spoiler and the side wall of the fuel pipe body where the fuel injector is located is 1 / 5 to 4 / 5 of the width of the internal cavity of the fuel pipe body.

[0018] An oil-cooled flat wire motor includes the aforementioned oil-cooled flat wire motor heat dissipation structure.

[0019] The above technical solution makes the heat dissipation structure of the oil-cooled flat wire motor convenient to use and simple in structure. It has at least two oil spray nozzles, corresponding to the ends of the stator windings and the end near the stator core, to spray the conductors at the ends of the stator windings and the end near the stator core. Simultaneously, each oil spray nozzle corresponds to the spray position on the stator winding, allowing the cooling medium to be sprayed in a directional manner. Under the influence of the shape of the stator winding and the gravity of the cooling medium, the cooling medium flows along the surface of the conductors of the stator winding and simultaneously enters the inner layer of the stator winding. The surface flow of the inner conductor and the flow of the cooling medium at the stator winding ends change from random to directional flow, increasing the contact area between the cooling medium and the stator winding and improving the heat dissipation performance of the motor. The heat dissipation structure is equipped with baffles, which are positioned between adjacent oil injection ports, so that the cooling medium flows into the space between adjacent baffles in sequence, distributing the cooling medium. The flow rate of the cooling medium in the oil pipe body is affected by the baffles, so that the cooling medium flows out evenly from each oil injection port. Combined with the shape of the stator winding, the cooling medium is sprayed at specific points, improving the temperature uniformity of the stator winding. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the heat dissipation structure in the installation state according to an embodiment of the present invention;

[0021] Figure 2 This is a cross-sectional view of a heat dissipation structure according to an embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of a heat dissipation structure according to an embodiment of the present invention;

[0023] Figure 4 This is a cross-sectional view of a heat dissipation structure according to another embodiment of the present invention.

[0024] Figure 5 This is a schematic diagram of the flow direction of the cooling medium according to an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram showing the spray position and flow direction of the cooling medium according to an embodiment of the present invention;

[0026] Figure 7 yes Figure 1 An enlarged structural diagram of part A;

[0027] Figure 8 This is a schematic diagram of the structure of an embodiment of the present invention, showing an angle corresponding to the spray position of the oil injector and the conductor of the stator winding.

[0028] In the picture:

[0029] 1. Heat dissipation structure; 2. Stator core; 3. Stator winding; 4. Injection position; 5. Flow direction; 100. Injector; 101. Inlet; 102. Baffle; 103. Internal cavity; 104. Oil pipe body; 6. Turning protrusion; 7. Turning recess. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0031] Figure 1 The diagram shows a structural schematic of an embodiment of the present invention. This embodiment relates to a heat dissipation structure and motor for an oil-cooled flat wire motor, applicable to flat wire motors in new energy vehicles. The structure cools the flat wire motor during operation by spraying a cooling medium through an oil nozzle onto the corresponding spray positions of the stator winding. This allows the cooling medium to flow along the surface of the stator winding conductors. Under the combined action of gravity and the shape of the stator winding, the cooling medium flows in a directional direction, passing over more winding surfaces, increasing the contact area between the cooling medium and the stator winding, and improving the motor's heat dissipation capacity.

[0032] A heat dissipation structure for an oil-cooled flat wire motor, corresponding to any end of the stator core 2, such as: the heat dissipation structure 1 can be installed on the hybrid housing, the heat dissipation structure 1 can be integrated into the hybrid housing, or it can be fixedly installed on the hybrid housing by bolts or other connecting parts, depending on actual needs; when installed, the heat dissipation structure 1 corresponds to the position of any end of the stator core 2, that is, the heat dissipation structure 1 can correspond to the position of the insertion end of the stator winding 3, or the heat dissipation structure 1 can correspond to the position of the welding end of the stator winding 3, depending on actual needs, and the cooling medium is sprayed onto one end of the stator winding.

[0033] like Figure 1-6As shown, the heat dissipation structure 1 has an oil spray port 100 on the side near the stator winding 3. There are at least two sets of oil spray ports 100. Multiple sets of oil spray ports 100 are arranged along the axial direction of the stator winding 3 to spray the cooling medium onto the stator winding 3 from different positions. Among the multiple sets of oil spray ports 100, at least one set of oil spray ports 100 corresponds to the end position of the stator winding 3 and at least one set of oil spray ports 100 corresponds to the end position of the stator winding 3 near the stator core 2, so that the cooling medium is sprayed onto the end position of the stator winding 3 and the position near the end position of the stator core 2, so that the cooling medium flows from one end of the stator winding 3 to the other end along the axial and radial directions of the stator winding 3. The stator winding 3 is mounted on the stator core 2. The insertion end and welding end of the stator winding 3 are located at both ends of the stator core 2, respectively, and are located outside both ends of the stator core 2. Multiple sets of oil spray nozzles 100 of the heat dissipation device are arranged along the axial direction of the stator winding 3 from the end of the stator winding 3 to the end of the stator core 2. At least one set of oil spray nozzles 100 corresponds to the end of the stator winding 3 (the end of the stator winding 3 furthest from the stator core 2) to spray cooling medium onto the end of the stator winding 3. At least one set of spray nozzles corresponds to the end of the stator winding 3 closest to the stator core 2 to spray cooling medium onto the stator winding 3 at that location. The medium flows along the conductor surface of the stator winding 3. Under the influence of the shape of the conductor of the stator winding 3, it flows through the inner surface of the stator winding 3. The heat dissipation structure 1 is located outside the stator winding 3. Therefore, the cooling medium sprayed from the oil nozzle 100 sprays onto the conductor of the stator winding 3 located outside the stator core 2. The stator winding 3 has multiple windings. Under the action of gravity, the cooling medium flows to the conductor of the inner winding of the stator winding 3 and flows along the surface of the inner conductor. Under the influence of gravity and the shape of the stator winding 3, the cooling medium flows through each winding of the stator winding 3, increasing the contact area between the cooling medium and the stator winding 3 and improving the heat dissipation performance of the motor.

[0034] The stator winding 3 is composed of multiple hairpin coils with similar structures, rotated and stacked according to certain rules. These hairpin coils are U-shaped conductors, so the cooling medium flows along the surface of the conductor, and the flow direction 5 is influenced by the shape of the conductor, flowing along its shape. To enable the oil spray nozzles 100 to spray multiple conductors, multiple oil spray nozzles 100 in each group are arranged circumferentially along the stator core 2, and are located on the same circumference. The projection areas of adjacent groups of oil spray nozzles 100 on the stator winding 3 are adjacent, but adjacent groups are not on the same circumference. That is, multiple groups of oil spray nozzles 100 are arranged axially along the stator winding 3, and adjacent groups of oil spray nozzles 100 are arranged in two radial directions along the stator winding 3. In the first radial direction... Upward, a set of oil injection nozzles 100 is arranged on the first circumference, and another set of oil injection nozzles 100 is arranged on the adjacent circumference in the second radial direction. A third set of oil injection nozzles 100 is arranged on the adjacent circumference in the first radial direction, and a fourth set of oil injection nozzles 100 is arranged on the adjacent circumference in the second radial direction. This arrangement continues, with multiple sets of oil injection nozzles 100 arranged on different circumferences in two adjacent radial directions. The number of sets of oil injection nozzles 100 and the number of oil injection nozzles 100 in each set are selected according to the shape and size of the actual stator winding 3.

[0035] In this embodiment, preferably, there are two sets of oil spray nozzles 100. Since the stator is horizontal in the motor, the heat dissipation device is located above the end of the stator core 2, spraying cooling medium onto the upper half of the stator winding 3. This divides the upper half of the stator winding 3 into left and right sections. One set of oil spray nozzles 100 corresponds to the left half of the stator winding 3, and the other set corresponds to the right half. The two sets of oil spray nozzles 100 correspond to two adjacent radial stator windings 3. The two sets of oil spray nozzles 100 are arranged on adjacent circumferences along the axial direction of the stator winding 3. One set of oil spray nozzles 100 corresponds to the end of the stator winding 3, and the other set corresponds to the end of the stator winding 3. The positions of the two sets of oil spray nozzles 100 corresponding to the ends of the stator core 2 on the stator winding 3 cover the upper half of the stator winding 3, spraying the upper half of the stator winding 3 with cooling medium. The cooling medium sprayed onto the winding flows in two directions. One part of the cooling medium flows from the end of the stator winding 3 towards the end near the stator core 2 along the surface of the conductor, and the other part of the cooling medium flows from the end of the stator winding 3 near the stator core 2 towards the end of the stator winding 3 along the surface of the conductor. Under the action of its own gravity and the shape of the conductor, the cooling medium flows through the surface of each layer of conductor of the stator winding 3, increasing the contact area between the cooling medium and the stator winding 3 and improving the heat dissipation capacity of the motor.

[0036] In this embodiment, preferably, the heat dissipation structure 1 corresponds to the insertion end of the stator winding 3. A set of oil spray nozzles located at the end of the stator winding corresponds to the position of the turning protrusion 6 of the insertion end of the conductor in the stator winding. A set of oil spray nozzles 100 located at the end of the stator winding 3 is close to the turning protrusion 6 of the insertion end of the conductor in the stator winding 3. The cooling medium is sprayed from the oil spray nozzles 100 and then sprayed onto the surface of the turning protrusion 6. A set of oil spray nozzles 100 located near the end of the stator core 2 corresponds to the position of the turning recess 7 of the insertion end of the conductor in the stator winding. A set of oil spray nozzles 100 located near the end of the stator core 2 is close to the turning recess 7 of the insertion end of the conductor in the stator winding 3. The cooling medium is sprayed from the oil spray nozzles 100 and then sprayed onto the surface of the turning recess 7. The cooling medium is sprayed from two locations, so that the cooling medium flows in two directions. The bend protrusion 6 is located on one side of the bend at the conductor's insertion end, and the bend recess 7 is located on the other side of the bend at the conductor's insertion end. The bend protrusion 6 is connected to the inside of one slot of the conductor, and the bend recess 7 is connected to the inside of the other slot of the conductor. Since the two slots are located in different slots, in the stator winding, the bend protrusion 6 protrudes in the direction of the oil injector 100, and the bend recess 7 is recessed in the direction of the oil injector 100. The bend protrusion 6 of the conductor is closer to the oil injector 100 than the bend recess 7. When the cooling medium is sprayed by the oil nozzle 100 corresponding to the position of the bend protrusion 6 on the outside of the stator winding under the action of gravity, the cooling medium is sprayed onto the bend protrusion 6 of the conductor, and then flows along the surface of the bend protrusion 6, flowing towards the inner winding along the shape of the bend protrusion 6; when the cooling medium is sprayed by the oil nozzle 100 corresponding to the position of the bend recess 7 on the inside of the stator winding, the cooling medium is sprayed onto the bend recess 7 of the conductor, and then flows along the surface of the bend recess 7, flowing towards the outer winding along the shape of the bend recess 7. A set of oil nozzles 100 located at the end of the stator winding always corresponds to the position of the bend protrusion 6 of the conductor insertion end in the stator winding. A set of oil nozzles 100 located near the end of the stator core 2 always corresponds to the position of the bend recess 7 of the conductor insertion end in the stator winding. When the bend recess 7 is blocked by the bend protrusion 6, the position of the oil nozzle 100 corresponds to the position of the bend recess 7 located in the gap between the bend protrusions 6.

[0037] like Figure 5-8As shown, each oil nozzle 100 is configured to correspond to the position of a group of conductors, such that each group of conductors is sprayed with cooling medium. The cooling medium flows along the surface of the conductor under the influence of the conductor shape. The stator core 2 has multiple radial layers, and conductors are provided in each slot of each layer. The conductors in the same radial direction at the plug end constitute a group of conductors. Each oil nozzle 100 corresponds to the position of a group of conductors, and the outermost conductor of each group of conductors is sprayed with cooling medium. Therefore, the number of oil nozzles 100 in each group is selected according to the number of conductor groups in the projection area of ​​the oil nozzles 100 on the stator winding 3.

[0038] In order to enable the cooling medium to flow in a directional manner, the oil nozzle 100 corresponds to the spray position 4 of the stator winding 3 according to the shape of the conductor and flows along the surface of the conductor. The spray position 4 is the outer surface of the end of the conductor in each group of conductors of the stator winding 3 or the outer surface of the conductor near the end of the stator core 2. This allows the cooling medium to flow along the surface of the conductor of the stator winding 3 and in the radial direction of the stator winding 3. In this embodiment, preferably, at the end of the stator winding 3, the spray position 4 is the outer surface of the bend protrusion 6 of the conductor's insertion end, and at the end of the stator winding 3 near the stator core 2, the spray position 4 is the outer surface of the bend recess 7 of the conductor's insertion end.

[0039] In each group of fuel injectors 100, the multiple fuel injectors 100 can be arranged at equal intervals or at non-equal intervals. The shape and size of the stator winding 3 are selected. In this embodiment, since the stator winding 3 is a ring structure, when the stator winding 3 is arranged horizontally, the distance between the middle conductor group is large and the distance between the conductor groups on both sides is small in the projection on the horizontal plane. The multiple fuel injectors 100 are not arranged at equal intervals, and the distance between adjacent fuel injectors 100 gradually decreases from the center position of the upper half of the stator winding 3 to both sides. The arrangement is based on the position of the conductor groups in the stator winding 3.

[0040] The axis of the oil injection port 100 can be set vertically or inclined, depending on the position of the conductor group in the stator winding 3. In this embodiment, preferably, the axis of the oil injection port 100 is set vertically, and the axes of multiple oil injection ports 100 are parallel, so that the cooling medium flows vertically to the surface of the stator winding 3 after being sprayed from the oil injection port 100, so that the cooling medium can flow to the conductor of the inner layer of the stator winding 3 under the action of the power of spraying and its own gravity.

[0041] The distance between two adjacent sets of fuel injectors 100 is selected according to the size and shape of the stator winding 3, and no specific requirements are made here.

[0042] like Figure 2-4As shown, the heat dissipation structure 1 also includes an oil pipe body 104, which has an internal cavity. An oil spray nozzle 100 communicates with the internal cavity 103 of the oil pipe body 104 to facilitate the flow of the cooling medium. An oil inlet 101 is also included, connected to the oil pipe body 104 and communicating with the internal cavity 103 of the oil pipe body 104 to allow the cooling medium to enter the interior of the oil pipe body 104. The cooling medium enters the internal cavity 103 of the oil pipe body 104 through the oil inlet 101, flows within the cavity, and is then sprayed out from each of the oil spray nozzles 100, achieving continuous spraying of the cooling medium.

[0043] The oil pipe body 104 has an arc-shaped structure, or there are multiple oil pipe bodies 104 arranged in an arc shape with the axis of the stator winding 3 as the center. The selection is made according to actual needs. In this embodiment, preferably, the oil pipe body 104 has an arc-shaped structure, which is adapted to the curvature of the stator winding 3, and sprays the upper half of the conductor of the stator winding 3.

[0044] To ensure uniform spraying of the cooling medium from each injection port 100, a baffle 102 is provided within the internal cavity 103 of the oil pipe body 104. The baffle 102 is positioned between adjacent injection ports 100, creating a single injection port 100 between each adjacent baffle 102, thus distributing the cooling medium to each injection port 100. The baffle 102 is a plate-shaped structure, fixedly installed on the inner wall of the oil pipe body 104 where the injection ports 100 are located. The baffle 102 is positioned along the width of the oil pipe body 104, and its width can be the same as or different from the width of the internal cavity 103, depending on actual needs. A single injection port 100 is positioned between adjacent baffles 102, creating a receiving space between the two adjacent baffles 102 and the inner wall of the oil pipe body 104 to facilitate the distribution of the cooling medium. The cooling medium enters the oil pipe body 104 through the inlet 101. After entering the internal cavity 103 of the tube body 104, the cooling medium first enters the space between the two baffles 102 corresponding to the oil inlet 101. Simultaneously, the cooling medium flows out from the corresponding oil injection port 100. When the cooling medium in this space exceeds the top of the baffle 102, it overflows from the top of the baffle 102 and flows into the space between the baffles 102 on both sides. The cooling medium then flows out from the oil injection ports 100 on both sides. This sequential flow continues until all the spaces between the baffles 102 contain cooling medium, which then flows out from each oil injection port 100. The baffles 102 ensure that the cooling medium is evenly distributed into each injection port, thereby rationally distributing the outflow of cooling medium from each injection port 100, resulting in better temperature uniformity of the stator winding 3.

[0045] The spoiler 102 is arranged to intersect the axis of the fuel injector 100. The distance between the free end of the spoiler 102 and the side wall of the oil pipe body 104 where the fuel injector 100 is located is 1 / 5 to 4 / 5 of the width of the internal cavity 103 of the oil pipe body 104. The height of the spoiler 102 is less than the height of the internal cavity 103 of the oil pipe body 104. This distance is selected according to the total flow rate of the cooling medium in the oil inlet 101, so that the flow rate of the cooling medium entering the internal cavity 103 of the oil pipe body 104 can be uniformly discharged from each fuel injector 100, thereby controlling the flow rate of the cooling medium in each fuel injector 100.

[0046] An oil-cooled flat wire motor includes the aforementioned oil-cooled flat wire motor heat dissipation structure 1.

[0047] The heat dissipation structure of this oil-cooled flat wire motor is fixedly installed on the hybrid housing during use, corresponding to the end of the stator core 2 where the stator winding 3 is inserted. The cooling medium enters the internal cavity 103 of the oil pipe body 104 from the oil inlet 101, and under the action of the baffles 102, enters the space between adjacent baffles 102 in sequence, and is sprayed out from the oil nozzle 100 corresponding to the space, spraying the spray position 4 at the end of the stator winding 3 and the spray position 4 at the end of the stator winding 3 near the stator core 2. The oil nozzle 100 sprays the stator winding 3 at the corresponding spray position 4. The cooling medium flows along the conductor surface in two directions under the influence of gravity and the shape of the conductor. One direction of the cooling medium is from the end of the stator winding 3 to the end near the stator core 2, and the other direction of the cooling medium is from the end of the stator winding 3 near the stator core 2 to the end of the stator winding 3, along the conductor surface. Under the influence of gravity and the jet velocity, the cooling medium enters the inner layer of the stator winding 3 and flows along the surface of the inner conductor. Under the influence of gravity and the shape of the conductor, it flows across the entire surface of the conductor of the stator winding 3.

[0048] By using the above-mentioned heat dissipation structure to cool the motor, the contact area between the cooling medium and the stator winding is increased by 40%, and the heat dissipation performance of the motor is improved by 35%.

[0049] The above technical solution makes the heat dissipation structure of the oil-cooled flat wire motor convenient to use and simple in structure. It has at least two oil spray nozzles, corresponding to the ends of the stator windings and the end near the stator core, to spray the conductors at the ends of the stator windings and the end near the stator core. Simultaneously, each oil spray nozzle corresponds to the spray position on the stator winding, allowing the cooling medium to be sprayed in a directional manner. Under the influence of the shape of the stator winding and the gravity of the cooling medium, the cooling medium flows along the surface of the conductors of the stator winding and simultaneously enters the inner layer of the stator winding. The surface flow of the inner conductor and the flow of the cooling medium at the stator winding ends change from random to directional flow, increasing the contact area between the cooling medium and the stator winding and improving the heat dissipation performance of the motor. The heat dissipation structure is equipped with baffles, which are positioned between adjacent oil injection ports, so that the cooling medium flows into the space between adjacent baffles in sequence, distributing the cooling medium. The flow rate of the cooling medium in the oil pipe body is affected by the baffles, so that the cooling medium flows out evenly from each oil injection port. Combined with the shape of the stator winding, the cooling medium is sprayed at specific points, improving the temperature uniformity of the stator winding.

[0050] The embodiments of the present invention have been described in detail above, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A heat dissipation structure for an oil-cooled flat wire motor, corresponding to any end of the stator core, characterized in that: The heat dissipation structure is provided with an oil spray port on the side near the stator winding. There are at least two sets of oil spray ports, and multiple sets of oil spray ports are arranged along the axial direction of the stator winding. Among the multiple sets of oil spray ports, at least one set of oil spray ports corresponds to the end position of the stator winding, and at least one set of oil spray ports corresponds to the end position of the stator winding near the stator core. This allows the cooling medium to be sprayed onto the end position of the stator winding and the position near the end position of the stator core. The cooling medium flows along the direction from the end position of the stator winding to the stator core and from the position near the end position of the stator winding to the end position of the stator core, and flows through the inner layer of the stator winding. A set of oil nozzles located at the end of the stator winding corresponds to the position of the bend protrusion of the conductor insertion end in the stator winding, and a set of oil nozzles located near the end of the stator core corresponds to the position of the bend recess of the conductor insertion end in the stator winding.

2. The heat dissipation structure for an oil-cooled flat wire motor according to claim 1, characterized in that: Each of the oil injection nozzles is configured to correspond to the position of a set of conductors, such that each set of conductors is sprayed with a cooling medium that flows along the surface of the conductors.

3. The heat dissipation structure for an oil-cooled flat wire motor according to claim 2, characterized in that: The oil injection port corresponds to the injection position of the stator winding, which is the outer surface of the end of each set of conductors in the stator winding and the outer surface of each set of conductors in the stator winding near the end of the stator core, so that the cooling medium flows along the surface of the conductors of the stator winding and flows radially along the stator winding.

4. The heat dissipation structure for an oil-cooled flat wire motor according to claim 1, 2, or 3, characterized in that: The plurality of oil injection ports in each group are arranged along the circumference of the stator core, and the projection areas of two adjacent groups of oil injection ports on the stator winding are arranged adjacently, and the two adjacent groups of oil injection ports are on different circumferences.

5. The heat dissipation structure for an oil-cooled flat wire motor according to claim 4, characterized in that: In each group of fuel injectors, multiple fuel injectors are not equidistantly arranged.

6. The heat dissipation structure for an oil-cooled flat wire motor according to claim 1, 2, 3, or 5, characterized in that: The heat dissipation structure also includes: The oil pipe body has an internal cavity, and the oil injection port is connected to the internal cavity of the oil pipe body to facilitate the flow of the cooling medium. An oil inlet is provided, which is connected to the oil pipe body and communicates with the internal cavity of the oil pipe body to facilitate the entry of cooling medium into the oil pipe body.

7. The heat dissipation structure for an oil-cooled flat wire motor according to claim 6, characterized in that: The oil pipe body is an arc-shaped structure, or there are multiple oil pipe bodies arranged in an arc shape with the axis of the stator winding as the center.

8. The heat dissipation structure for an oil-cooled flat wire motor according to claim 6, characterized in that: The internal cavity of the oil pipe body is provided with a baffle plate, which is located between adjacent oil injection ports. The adjacent baffle plates form a receiving space to distribute the cooling medium to each oil injection port.

9. The heat dissipation structure for an oil-cooled flat wire motor according to claim 8, characterized in that: The spoiler is arranged intersecting the axis of the fuel injector. The distance between the free end of the spoiler and the side wall of the oil pipe body where the fuel injector is located is 1 / 5 to 4 / 5 of the width of the internal cavity of the oil pipe body.

10. An oil-cooled flat wire motor, characterized in that: Including the heat dissipation structure for oil-cooled flat wire motors as described in any one of claims 1-9.

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