A concentrated winding axially cooled motor stator and motor

Abstract

The present invention provides a concentrated winding axially cooled motor stator, comprising a blocking member and an axial oil supply device. The blocking member is provided on the stator core, contacts the stator winding, and blocks the slot of the stator core. The blocking member and two adjacent groups of stator winding coils located in the slot of the stator core form a cooling medium circulation cavity. The axial oil supply device is provided at either end of the stator core, or the axial oil supply device is connected to the housing, and the position of the axial oil supply device corresponds to either end of the stator core. The axial oil supply device is provided with an oil spray hole on the side close to the stator winding, and the axis of the oil spray hole is arranged to intersect obliquely with the axis of the stator winding, spraying the oil onto the blocking member and / or the stator winding, so that the cooling medium flows along the axial inner surface of the stator winding toward the two ends of the stator winding. The beneficial effect of the present invention is that the axial oil supply device is located at the output end or the non-output end of the motor stator, which increases the heat exchange contact area between the cooling medium and the winding, thereby improving the heat dissipation capacity.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors, and in particular relates to a concentrated winding axially cooled motor stator and a motor. Background Art

[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 demand. As one of the core components, the motor has begun to be integrated with the gearbox or controller. As the power density requirements become higher and higher, the heat dissipation problem has become more important, whether as a whole or a single motor. Therefore, there are also higher requirements for cooling methods.

[0003] During motor operation, the main heat-generating component is the stator coil. When alternating current flows through it, it generates a rotating magnetic field, which interacts with the rotor's magnetic field to produce electromagnetic torque, causing the motor to rotate. When current passes through the stator coil, energy is lost due to resistance, primarily converted into heat. Therefore, it is crucial to better control the temperature rise of the stator coil. Currently, similar oil-cooled motors primarily dissipate heat by cooling the stator ends and the middle of the stator core with oil being thrown from the rotor to the ends of the stator. This approach is more suitable for distributed winding stators. Concentrated winding stators have shorter ends, a more dispersed structure, and larger gaps, so this approach has limitations in dissipating heat. Summary of the Invention

[0004] In view of the above problems, the present invention provides a concentrated winding axially cooled motor stator and a motor to solve the above or other problems existing in the prior art.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a concentrated winding axial cooling motor stator is arranged on the housing, including a stator core and a stator winding, the stator winding is arranged on the stator core, and also includes a blocking member and an axial oil supply device, wherein,

[0006] The blocking member is provided on the stator core and contacts the stator winding to block the slot of the stator core;

[0007] The axial oil supply device is provided at either end of the stator core, or the axial oil supply device is connected to the housing, and the position of the axial oil supply device corresponds to either end of the stator core; and

[0008] An oil spray hole is provided on the side of the axial oil supply device close to the stator winding. The axis of the oil spray hole is arranged to intersect obliquely with the axis of the stator winding, so that the outflow line of the cooling medium is inclined, extending from the oil spray hole to one end of the axis of the stator winding, and spraying onto the blocking member and / or the stator winding, so that the cooling medium flows along the axial inner surface of the stator winding to both ends of the stator winding.

[0009] Furthermore, the blocking member and the two adjacent groups of stator winding coils located in the slots of the stator core form a cooling medium circulation cavity, and the oil injection hole corresponds to the cooling medium circulation cavity. The blocking member blocks the cooling medium flowing out of the oil injection hole and guides the flow path of the cooling medium so that the cooling medium flows along the axial inner surface of the stator winding to the two ends of the stator winding.

[0010] Furthermore, the axis of the oil injection hole extends obliquely from the oil injection hole toward an end away from the stator winding where the axial oil supply device is provided.

[0011] Furthermore, there are multiple oil injection holes, and each cooling medium circulation cavity corresponds to the position of at least one oil injection hole;

[0012] Alternatively, the plurality of oil spray holes are arranged such that adjacent oil spray holes are spaced apart by a cooling medium circulation cavity;

[0013] Alternatively, the plurality of oil spray holes are arranged as follows: some of the oil spray holes correspond to some of the cooling medium circulation cavities, and in another portion of the oil spray holes, adjacent oil spray holes are arranged with one cooling medium circulation cavity between them, so that each coil of the stator winding is sprayed with cooling medium.

[0014] Furthermore, the axial oil supply device also includes:

[0015] The oil pipe body has a cavity inside, and the oil injection hole is connected to the cavity inside the oil pipe body to facilitate the flow of cooling medium;

[0016] The oil inlet is connected to the oil pipe body and communicates with the internal cavity of the oil pipe body to facilitate the cooling medium to enter the interior of the oil pipe body.

[0017] Furthermore, the cross-sectional shape of the oil pipe body is circular or polygonal.

[0018] Furthermore, the oil pipe body is an annular structure, or there are multiple oil pipe bodies, and the multiple oil pipe bodies are arranged in an annular shape with the axis of the stator winding as the center.

[0019] Furthermore, the blocking member has a guide portion, which is arranged opposite to the oil injection hole and is used to change the flow direction of the cooling medium.

[0020] Furthermore, the blocking member is a slot wedge, a frame or insulating paper.

[0021] A concentrated winding motor comprises the above-mentioned concentrated winding axially cooled motor stator.

[0022] Due to the adoption of the above technical solution, the structure of the concentrated winding axial cooling motor stator is simple and easy to use. It has an axial oil supply device, which is located at the outlet end or non-outlet end of the motor stator, and sprays the cooling medium from one end of the motor stator. The axis of the oil spray hole of the axial cooling structure is arranged to be obliquely intersected with the axis of the stator winding, so that the cooling medium outflow line is inclined to spray toward the other end of the motor stator, sprayed onto the blocking member and blocked by the blocking member. The blocking member has a guide portion to divert the cooling medium and change the flow direction of the cooling medium, so that the cooling medium is divided into two parts and sprayed onto the axial inner surface of the concentrated winding stator coil, and flows along the axial inner surface of the coil to the two ends of the stator winding and flows out from the two ends, thereby increasing the heat exchange contact area between the cooling medium and the winding, and improving the heat dissipation capacity. The cooling medium flows through the entire axial inner surface of the coil, solving the problems of excessive temperature rise in the middle of the concentrated winding coil and excessive temperature difference between the two ends, thereby improving the power density.

[0023] The different inclination angles of the oil injection hole axis result in different flow rates of the cooling medium flowing to the two ends. Different oil outlet angles can adjust the axial flow distribution to the two ends, so that the axial oil supply device can cool different types of stator windings and has a wide range of applications.

[0024] The axial oil supply device comprises an oil pipe body with an internal cavity, and a plurality of oil injection holes are provided on a side of the oil pipe body facing the stator winding. The oil pipe body is arranged around the circumference of the stator winding and is installed in the yoke space at either end of the motor stator, making full use of the stator yoke and being fixed to the housing together with the stator, thereby improving space utilization. Alternatively, the axial oil supply device is installed on the housing, or the axial oil supply device is integrated into the housing, and when the motor stator is installed, the axial oil supply device corresponds to the position of the stator yoke, thereby making full use of the internal space of the housing and improving space utilization of the housing.

[0025] The gearbox lubricating oil is used as the cooling medium. After flowing out of the gearbox, the lubricating oil enters the axial oil supply device to cool the motor stator, making the gearbox oil circuit design simpler, requiring less space, and easier to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural schematic diagram of an axial oil supply device according to an embodiment of the present invention;

[0027] Figure 2 This is another structural schematic diagram of an axial oil supply device according to an embodiment of the present invention;

[0028] Figure 3 This is a structural schematic diagram of an axial oil supply device installed at the outlet end of a stator according to an embodiment of the present invention;

[0029] Figure 4This is a schematic structural diagram of an axial oil supply device installed at a non-outlet end of a stator according to an embodiment of the present invention;

[0030] Figure 5 This is a structural schematic diagram of an axial oil supply device according to an embodiment of the present invention, which is mounted on a housing and matched with a stator end mounting position;

[0031] Figure 6 This is a schematic diagram of the stator structure with an axial oil supply device installed in one embodiment of the present invention;

[0032] Figure 7 This is a schematic diagram of the axial flow of the cooling medium when the axial oil supply device of one embodiment of the present invention is provided at the outlet end of the stator winding coil;

[0033] Figure 8 This is a schematic diagram of the axial flow of the cooling medium when the axial oil supply device of one embodiment of the present invention is provided at the non-outlet end of the stator winding coil;

[0034] Figure 9 This is a schematic diagram of the axial flow of the cooling medium when the axial oil supply device of one embodiment of the present invention is provided on the housing and corresponds to the non-outlet end of the stator winding coil;

[0035] Figure 10 This is another schematic diagram of the axial flow of the cooling medium when the axial oil supply device of one embodiment of the present invention is provided on the housing and corresponds to the non-outlet end of the stator winding coil;

[0036] Figure 11 This is a schematic diagram of the axial flow of the cooling medium when the axial oil supply device of one embodiment of the present invention is provided on the housing and corresponds to the output end of the stator winding coil;

[0037] Figure 12 This is another schematic diagram of the axial flow of the cooling medium when the axial oil supply device of one embodiment of the present invention is provided on the housing and corresponds to the outlet end of the stator winding coil;

[0038] Figure 13 1 is a schematic diagram of the end flow of the cooling medium according to an embodiment of the present invention;

[0039] Figure 14 1 is a schematic structural diagram of a slot wedge according to an embodiment of the present invention;

[0040] Figure 15 1 is a schematic diagram of the end structure of a slot wedge according to an embodiment of the present invention;

[0041] Figure 16 It is a schematic structural diagram of a skeleton of an embodiment of the present invention;

[0042] Figure 17This is a schematic structural diagram of the corresponding relationship between an oil injection hole and a cooling medium circulation cavity according to an embodiment of the present invention;

[0043] Figure 18 This is a schematic structural diagram of another embodiment of the present invention showing the corresponding relationship between the oil injection hole and the cooling medium circulation cavity;

[0044] Figure 19 This is a simulation diagram of the present invention's scheme of using a cooling medium to spray the gap axially for cooling;

[0045] Figure 20 This is a simulation diagram of a scheme for cooling the stator ends and the middle of the core by radial spraying in the prior art.

[0046] In the picture:

[0047] 1. Axial oil supply device 2. Stator winding 3. Slot wedge

[0048] 4. Stator core 5. Fixing bolt 6. Wire outlet

[0049] 7. Non-outlet terminal 100, oil pipe body 101, oil inlet

[0050] 102, oil injection hole 103, connection part 104, cooling medium outflow line

[0051] 300, guide portion L, slot wedge height W, slot wedge width

[0052] 8. Frame 800, frame guide part DETAILED DESCRIPTION

[0053] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0054] Figure 1 The structure of an embodiment of the present invention is shown, specifically the structure and connection relationship of this embodiment. This embodiment relates to a concentrated winding axially cooled motor stator and motor for new energy vehicles. The axial oil supply device is provided to axially cool the concentrated winding axially cooled motor stator. The cooling medium is directly sprayed onto the axial inner surface of the concentrated winding stator coil, and the cooling medium flows along the inner surface of the stator coil to the two ends of the stator winding and flows out from the two ends, thereby increasing the heat exchange contact area between the cooling medium and the winding, improving the heat dissipation capacity, solving the problems of excessive temperature rise in the middle of the concentrated winding coil and excessive temperature difference between the two ends, and improving power density; at the same time, the axial oil supply device is installed on the yoke at either end of the stator core, or installed on the housing and matched with the output end or non-output end position of the stator winding, thereby improving the space utilization of the hybrid box and the single motor housing.

[0055] A concentrated winding axially cooled motor stator, such as Figure 3-6As shown, it is arranged on the housing, which can be a hybrid housing, a single motor housing, or other housings, and is set according to actual needs;

[0056] The concentrated winding axially cooled motor stator comprises a stator core 4 and a stator winding 2. The stator winding 2 is arranged on the stator core 4 to form an electromagnetic circuit to generate a rotating magnetic field. The stator winding 2 adopts a centralized wiring method.

[0057] It also includes an axial oil supply device 1 and a blocking member, wherein:

[0058] The blocking member is provided on the stator core 4 and contacts the positioning winding 2 to fix the stator winding 2 and seal the slot of the stator core 4. The blocking member and the stator winding coils on both sides of the slot of the stator core 4 form a cooling medium circulation cavity, so that the cooling medium flowing out of the axial oil supply device 1 flows and is convenient for the cooling medium to be sprayed onto the axial inner surface of the stator winding coil. The cooling medium circulation cavity is formed by the blocking member and the slot portion of the stator winding coil located on both side walls of the slot of the stator core to facilitate the flow of the cooling medium.

[0059] The blocking member is a slot wedge 3 or a skeleton 8 or insulating paper. When the blocking member is a slot wedge 3, the slot wedge 3 is provided at the notch of the slot of the stator core 4, contacts the stator winding 2, fixes the stator winding 2, and prevents the stator winding 2 from coming out of the slot of the stator core 4; when the blocking member is a skeleton 8, the skeleton 8 is provided on the tooth portion of the stator core 4, is sleeved on the stator core 4, contacts the stator winding 2, fixes the stator winding 2, and prevents the stator winding 2 from coming out of the slot of the stator core 4; or, the blocking member is insulating paper, which is provided on the inner wall of the slot of the stator core 4 and seals the notch of the slot of the stator core 4, contacts the stator winding 2, and prevents the stator winding 2 from coming out of the slot of the stator core 4; or other structures are selected according to actual needs, and no specific requirements are made here.

[0060] The axial oil supply device 1 is provided at either end of the stator core 4, or the axial oil supply device 1 is connected to the housing, and the position of the axial oil supply device 1 corresponds to either end of the stator core 4; and, an oil spray hole 102 is provided on the side of the axial oil supply device 1 close to the stator winding 2, and the oil spray hole 102 corresponds to the cooling medium circulation cavity. The blocking member blocks the cooling medium flowing out of the oil spray hole 102 and guides the flow path of the cooling medium so that the cooling medium flows along the axial inner surface of the stator winding 2 to the two ends of the stator winding 2. The cooling medium flowing out of the axial oil supply device 1 flows in the cooling medium circulation cavity and sprays onto the blocking member and / or the stator winding. On the coil of group 2, the cooling medium sprayed onto the coil of stator winding 2 flows along the axial inner surface of the stator winding coil, and sprayed onto the cooling medium on the blocking member. The blocking member blocks the cooling medium and changes the flow line direction of the cooling medium, dividing the cooling medium into two parts. The two parts of cooling medium flow along the axial inner surface of the stator winding coil respectively, one part of the cooling medium flows to one end of the stator winding 2, and the other part of the cooling medium flows to the other end of the stator winding 2, so that the cooling medium flows through the entire axial inner surface of the stator winding 2, and the cooling medium is in full contact with the entire stator winding coil, thereby increasing the heat exchange contact area and improving the heat dissipation capacity.

[0061] Specifically, the axial oil supply device 1 is provided at either end of the stator core 4. Figure 3 、 4 As shown in Figure 5, the axial oil supply device 1 is connected to the stator core 4 and is provided at the outlet terminal 6 of the stator winding 2, or the axial oil supply device 1 is connected to the stator core 4 and is provided at the non-outlet terminal 6 of the stator winding 2. The axial oil supply device 1 is installed in the yoke space of the stator core 4, and the yoke space on both sides of the stator core 4 can be installed, so that the yoke space of the stator core 4 is fully utilized, the oil path cross-sectional area is increased, and the space occupied by the corresponding housing is reduced. The axial oil supply device 1 is fixedly connected to the stator core 4, which improves the space utilization rate of the housing and reduces the complexity of the housing design. When the axial oil supply device 1 is installed at either end of the stator core 4, the oil pipe body 100 of the axial oil supply device 1 is provided with a connecting portion 103, and the connecting portion 103 is provided with a mounting hole. The axial oil supply device 1 is fixedly installed in the yoke space at either end of the stator core 4 by the fixing bolt 5. At the same time, the motor stator is fixedly installed in the housing by the fixing bolt 5.

[0062] like Figure 7 As shown, the axial oil supply device 1 is fixedly mounted on the outlet end of the stator core 4. The axial oil supply device 1 is arranged around the circumference of the outlet end of the stator winding 2. The axis of the oil injection hole 102 is arranged obliquely and intersects with the axis of the stator winding 2.

[0063] like Figure 8As shown, the axial oil supply device 1 is fixedly mounted on the non-outlet end of the stator core 4. The axial oil supply device 1 is arranged around the circumference of the non-outlet end of the stator winding 2. The axis of the oil injection hole 102 is arranged obliquely and intersects with the axis of the stator winding 2.

[0064] Under the above two structures, the cooling medium is sprayed out obliquely from the oil spray hole 102, splashing onto the blocking member and / or the coil of the stator winding 2. The cooling medium sprayed onto the coil of the stator winding 2 flows along the axial inner surface of the stator winding coil. The cooling medium sprayed onto the blocking member, the blocking member blocks the cooling medium sprayed from the oil spray hole 102, changes the flow direction of the cooling medium, guides the flow line of the cooling medium, and divides the cooling medium into two parts. Both parts of the cooling medium are sprayed onto the coil of the stator winding 2, so that the cooling medium flows along the axial inner surface of the coil of the stator winding 2, a part of the cooling medium flows toward one end of the stator winding 2, and the other part of the cooling medium flows toward the other end of the stator winding 2, and flows out from both ends of the stator winding 2, thereby increasing the contact area of ​​heat exchange between the cooling medium and the stator winding 2 and improving the heat dissipation efficiency.

[0065] Or, as Figure 5 As shown, the axial oil supply device 1 is connected to the housing, and the position of the axial oil supply device 1 corresponds to either end of the stator core 4, that is, the axial oil supply device 1 is fixedly mounted on the housing, or the axial oil supply device 1 is integrated with the housing. When the motor stator is installed in the housing, the position of the axial oil supply device 1 corresponds to the position of the output terminal 6 or the non-output terminal 7 of the motor stator. The axial oil supply device 1 is arranged in a ring around the circumference of the stator winding 2, in contact with the end surface of the stator winding 2 at this end, or at a certain distance from the end surface of the stator winding 2 at this end. It is set according to actual needs. The axial oil supply device 1 sprays the cooling medium on the coil of the stator winding 2. The axial oil supply device 1 can be connected to the housing by fixing bolts 5 and other connecting parts, or the axial oil supply device 1 can be integrally formed inside the housing. When the motor stator is installed in the housing, it cooperates with the axial oil supply device 1, so that the axial oil supply device 1 is arranged around the circumference of the stator winding 2, spraying the cooling medium on the output terminal 6 or the non-output terminal 7 of the stator winding 2, and cooling the stator winding 2.

[0066] like Figure 9 As shown, the axial oil supply device 1 is fixedly connected to the housing, and the axial oil supply device 1 corresponds to the non-outlet end of the stator core 4. The axial oil supply device 1 is a certain distance away from the non-outlet end of the stator winding 2. The side of the axial oil supply device 1 provided with the oil injection hole 102 is arranged substantially parallel to the end surface of the non-outlet end of the stator winding 2, and the axis of the oil injection hole 102 is arranged to obliquely intersect with the end surface of the non-outlet end of the stator winding 2.

[0067] like Figure 10As shown, the axial oil supply device 1 is fixedly connected to the housing, and the axial oil supply device 1 corresponds to the non-outlet end of the stator core 4. The axial oil supply device 1 is a certain distance away from the non-outlet end of the stator winding 2. The side of the axial oil supply device 1 provided with the oil injection hole 102 corresponds to the side surface of the non-outlet end of the stator winding 2. The axis of the oil injection hole 102 is arranged to obliquely intersect with the side surface of the non-outlet end of the stator winding 2.

[0068] like Figure 11 As shown, the axial oil supply device 1 is fixedly connected to the housing, and the axial oil supply device 1 corresponds to the outlet end of the stator core 4. The axial oil supply device 1 is a certain distance away from the outlet end of the stator winding 2. The side of the axial oil supply device 1 provided with the oil injection hole 102 is arranged substantially parallel to the end face of the outlet end of the stator winding 2, and the axis of the oil injection hole 102 is arranged to obliquely intersect with the end face of the outlet end of the stator winding 2.

[0069] like Figure 12 As shown, the axial oil supply device 1 is fixedly connected to the housing, and the axial oil supply device 1 corresponds to the outlet end of the stator core 4. The axial oil supply device 1 is a certain distance away from the outlet end of the stator winding 2. The side of the axial oil supply device 1 provided with the oil injection hole 102 corresponds to the side of the outlet end of the stator winding 2. The axis of the oil injection hole 102 is arranged to obliquely intersect with the side of the outlet end of the stator winding 2.

[0070] Under the above four structures, the cooling medium is sprayed out from the oil spray hole 102 at an angle, splashing onto the blocking member and / or the coil of the stator winding 2. The cooling medium sprayed onto the coil of the stator winding 2 flows along the axial inner surface of the stator winding coil. The cooling medium sprayed onto the blocking member blocks the cooling medium sprayed from the oil spray hole 102, changes the flow direction of the cooling medium, guides the flow line of the cooling medium, and divides the cooling medium into two parts. Both parts of the cooling medium are sprayed onto the coil of the stator winding 2, so that the cooling medium flows along the axial inner surface of the coil of the stator winding 2, a part of the cooling medium flows toward one end of the stator winding 2, and the other part of the cooling medium flows toward the other end of the stator winding 2, and flows out from both ends of the stator winding 2, thereby increasing the contact area of ​​heat exchange between the cooling medium and the stator winding 2 and improving the heat dissipation efficiency.

[0071] Regardless of which installation method of the axial oil supply device 1 is used, the axial oil supply device 1 is located at the output terminal 6 or the non-output terminal 7 of the motor stator, and the cooling medium is sprayed on the axial inner surface of the coil of the stator winding 2 at this end. The cooling medium flows along the axial inner surface of the coil of the stator winding 2, and flows toward the two ends of the coil of the stator winding 2, and flows out from the two ends, thereby increasing the contact area of ​​heat exchange between the cooling medium and the stator winding 2, and improving the heat dissipation efficiency. The cooling medium flows along the axial inner surface of the coil of the stator winding 2, and flows toward the two ends of the coil of the stator winding 2, and flows out from the two ends, flowing through the entire axial inner surface of the coil of the stator winding 2, thereby solving the problem of excessive temperature rise in the middle of the coil of the stator winding 2 and excessive temperature difference between the two ends, thereby improving the power density.

[0072] The blocking member is connected to the stator core 4 and is arranged at the notch of the slot of the stator core 4. The blocking member is in contact with the stator winding 2 to fix the stator winding 2 and seal the notch of the slot of the stator core 4 to prevent the coil of the stator winding 2 from coming out from the inside of the slot of the stator core 4. The oil spray hole 102 of the axial oil supply device 1 corresponds to the slot of the stator core 4, and the oil spray hole 102 of the axial oil supply device 1 corresponds to the cooling medium circulation cavity in the slot of the stator core 4, so that after the cooling medium flows out from the oil spray hole 102, it flows in the cooling medium circulation cavity and sprays onto the blocking member. The blocking member blocks the cooling medium sprayed from the oil spray hole 102, changes the flow direction of the cooling medium, guides the flow line of the cooling medium, and divides the cooling medium into two parts. Both parts of the cooling medium are sprayed onto the coil of the stator winding 2, so that the cooling medium flows along the axial inner surface of the coil of the stator winding 2, part of the cooling medium flows toward one end of the stator winding 2, and the other part of the cooling medium flows toward the other end of the stator winding 2, and flows out from both ends of the stator winding 2, thereby increasing the contact area of ​​heat exchange between the cooling medium and the stator winding 2 and improving the heat dissipation efficiency.

[0073] The above-mentioned axial oil supply device 1, such as Figure 1 As shown, the cooling medium flows through the axial oil supply device 1 into the stator of the concentrated winding axially cooled motor, and is sprayed onto the axial inner surface of the stator winding 2 coil under the action of the blocking member, and flows along the axial inner surface of the coil to the two ends of the stator winding 2, which includes:

[0074] The oil pipe body 100 has a cavity inside to facilitate the flow of cooling medium. The cooling medium flows in the internal cavity of the oil pipe body 100 and flows to the positions of the coils of the stator winding 2. The cooling medium cools the coils of the stator winding 2.

[0075] The oil inlet 101 is connected to the oil pipe body 100 and communicates with the internal cavity of the oil pipe body 100 to facilitate the entry of the cooling medium into the oil pipe body 100. The cooling medium enters the internal cavity of the oil pipe body 100 from the oil inlet 101 and flows in the internal cavity of the oil pipe body 100.

[0076] The oil spray hole 102 is provided on the side of the axial oil supply device 1 close to the stator winding 2, that is, the oil spray hole 102 is provided on the side of the oil pipe body 100 close to the coil surface of the stator winding 2, and the oil spray hole 102 is connected to the internal cavity of the oil pipe body 100 to facilitate the outflow of the cooling medium. The number of the oil spray holes 102 is multiple, so that the cooling medium sprays and cools each coil of the stator winding 2 from different positions and directions; wherein, the axis of the oil spray hole 102 is arranged to intersect with the axis of the stator winding 2 at an angle, so that the outflow line of the cooling medium is in an inclined state, extending from the oil spray hole 102 to one end of the axis of the stator winding 2, and spraying onto the blocking member and / or the coil of the stator winding 2, so that the cooling medium flows along the axial inner surface of the stator winding 2 to the two ends of the stator winding 2, and the axis of the stator winding 2 is coaxial with the axis of the oil pipe body 100, that is, the axis of the oil spray hole 102 is arranged to intersect with the axis of the oil pipe body 1 00 is arranged to intersect at an angle, so that the outflow line of the cooling medium is in an inclined state, extending from the oil spray hole 102 to one end of the axis of the oil pipe body 100, and the cooling medium flowing out of the oil spray hole 102 is sprayed out from the oil pipe body 100 at an angle, sprayed onto the blocking member and / or the coil of the stator winding 2, and the cooling medium sprayed onto the coil of the stator winding 2 flows along the axial inner surface of the stator winding coil, and the cooling medium sprayed onto the blocking member. The blocking member changes the flow direction of the cooling medium and divides the cooling medium into two parts, so that the two parts of the cooling medium are sprayed onto the axial inner surface of the stator winding 2 coil, and the cooling medium flows along the inner surface of the stator winding 2 coil, a part of the cooling medium flows toward one end of the stator winding 2, and the other part of the cooling medium flows toward the other end of the stator winding 2, so that the cooling medium flows through the entire axial inner surface of the stator winding 2 coil, and cools the stator winding 2 coil.

[0077] The axis of the oil injection hole 102 is tilted in the direction from the oil injection hole 102 to the end away from the stator winding 2 where the axial oil supply device 1 is provided. The axis of the oil injection hole 102 is tilted. Since the axial oil supply device 1 is located at one end of the stator winding 2, in order to allow the cooling medium to be sprayed onto the blocking member and change the flow direction of the cooling medium through the blocking member and spray onto the coil of the stator winding 2, the axis of the oil injection hole 102 is tilted in the direction from the oil injection hole 102 to the end of the stator winding 2, and the stator winding end is away from the end where the axial oil supply device 1 is provided. For example, if the axial oil supply device 1 is provided at the outlet end 6 of the stator winding 2, then the axis of the oil injection hole 102 is tilted to extend from the oil injection hole 102 to the non-outlet end 7 of the stator winding 2.

[0078] There are multiple oil spray holes 102, and each cooling medium circulation cavity corresponds to the position of at least one oil spray hole 102, so that the cooling medium flowing out of the oil spray hole 102 is sprayed onto the blocking member, that is, there is a cooling medium circulation cavity in the slot of each stator core 4, and each cooling medium circulation cavity corresponds to at least one oil spray hole 102, that is, each cooling medium circulation cavity can correspond to one oil spray hole 102, or each cooling medium circulation cavity can correspond to two or more oil spray holes 102, and it is set according to actual needs.

[0079] Or, as Figure 17 As shown, the plurality of oil spray holes 102 are arranged as follows: adjacent oil spray holes 102 are spaced apart by a cooling medium circulation cavity, the plurality of oil spray holes 102 are spaced apart from the plurality of cooling medium circulation cavities, and there is a cooling medium circulation cavity between adjacent oil spray holes 102, that is, the number of oil spray holes 102 is half the number of cooling medium circulation cavities, when one oil spray hole 102 corresponds to one cooling medium circulation cavity, the two cooling medium circulation cavities on both sides of the cooling medium circulation cavity do not correspond to the oil spray hole 102, and there is a cooling medium circulation cavity between adjacent oil spray holes 102, which does not correspond to the oil spray hole 102, so that one side of each coil is sprayed with cooling medium to cool the coil.

[0080] Or, as Figure 18 As shown, the plurality of oil injection holes 102 are arranged as follows: some of the oil injection holes 102 correspond to some of the cooling medium circulation cavities, and in another part of the oil injection holes 102, adjacent oil injection holes 102 are arranged with one cooling medium circulation cavity between them, some of the oil injection holes 102 correspond to some of the cooling medium circulation cavities, and another part of the oil injection holes 102 are arranged with intervals between them, that is, some of the oil injection holes 102 correspond to some of the cooling medium circulation cavities one by one, and each oil injection hole 102 corresponds to one cooling medium circulation cavity; the other part of the oil injection holes 102 correspond to one of the cooling medium circulation cavities. The number of oil holes 102 is less than half the number of the other part of the cooling medium circulation cavity. In the correspondence between the oil spray holes 102 in this part and the cooling medium circulation cavity, when one oil spray hole 102 corresponds to one cooling medium circulation cavity, the two cooling medium circulation cavities on both sides of the cooling medium circulation cavity do not correspond to the oil spray hole 102, and there is a cooling medium circulation cavity between the two adjacent oil spray holes 102 that does not correspond to the oil spray hole 102, so that one side of the two coils in this part of the cooling medium circulation cavity is sprayed with cooling medium for cooling.

[0081] The setting mode of the oil injection hole 102 is selected according to the actual oil volume of the oil circuit, and no specific requirements are made here.

[0082] In order to achieve the above-mentioned cooling of each coil of the stator winding 2, the cooling medium can be sprayed onto each coil of the stator winding 2. In this embodiment, preferably, each cooling medium circulation cavity corresponds to an oil spray hole 102, each oil spray hole 102 corresponds to a slot of the stator core 4, and the distance between adjacent oil spray holes 102 is consistent with the distance between two adjacent slots of the stator core 4, so that the oil spray holes 102 correspond to the cooling medium circulation cavity. The plurality of oil spray holes 102 are arranged at equal intervals, that is, the oil spray holes 102 are located on the side of the oil pipe body 100 facing the stator winding 2, so that the cooling medium After being sprayed out from the oil pipe body 100, the cooling medium is directly sprayed onto the coils of the stator winding 2. The number of the oil spray holes 102 is consistent with the number of the slots of the stator core 4. The position of each oil spray hole 102 corresponds to each slot of the stator core 4, so that the cooling medium flowing out of the oil spray hole 102 is sprayed onto the coils of the stator winding 2. Each oil spray hole 102 corresponds to a slot of the stator core 4. When the stator winding 2 is a centralized winding, each slot of the stator core 4 has slot portions for two groups of coils inside. There is a gap between the slot portions of the two coils. The slot portions of the two coils and the blocking member form a cooling medium circulation cavity. The oil injection hole 102 corresponds to the cooling medium flow cavity. When the cooling medium is ejected from the oil injection hole 102, it flows along the cooling medium flow cavity. Due to the existence of the cooling medium flow pressure, the cooling medium has a certain length when it is ejected from the oil injection hole 102 and is directly sprayed onto the blocking member. At the same time, the axis of the oil injection hole 102 is arranged to intersect with the axis of the oil pipe body 100. Different inclination angles correspond to different cooling medium ejection angles of the oil injection hole 102, thereby adjusting the flow rate of the cooling medium flowing axially to the two ends of the stator winding 2. Then, the cooling medium ejected from the oil injection hole 102 is directed toward the inner side of the stator winding 2. The cooling medium is sprayed out at an inclined surface, and the cooling medium outflow line 104 has a certain inclination angle, which can be sprayed on various blocking members inside the slot of the same stator core 4. The blocking members change the flow line direction of the cooling medium sprayed from each oil spray hole 102, and divide the cooling medium into two parts, so that the two parts of the cooling medium are sprayed onto the stator winding 2 coil. The cooling medium flows along the axial inner surface of the coil, one part flows toward one end of the stator winding, and the other part flows toward the other end of the stator winding 2, so that the cooling medium flows through the entire stator winding 3 coil, thereby increasing the heat exchange contact area and cooling the stator winding 2.

[0083] The shape of the oil injection hole 102 can be circular, square, triangular, polygonal, or other shapes, which can be selected according to actual needs and no specific requirements are given here.

[0084] The cooling medium enters the internal cavity of the oil pipe body 100 from the oil inlet 101, flows in the internal cavity of the oil pipe body 100, and flows out from the oil spray hole 102. Since the axis of the oil spray hole 102 is arranged to intersect with the axis of the oil pipe body 100 at an angle, the cooling medium flowing out of the oil spray hole 102 is sprayed out at an angle, and the extension lines of multiple sprayed cooling media intersect on the same straight line, forming a conical cooling medium spray network with the axis of the oil pipe body 100 as the axis, spraying the cooling medium on the stator winding 2 coil from different positions and angles. The cooling medium is sprayed on the axial inner surface of the stator winding 2 coil, flows along the axial inner surface of the stator winding 2 coil, flows toward the two ends of the stator winding 2, flows out from the two ends, and flows through the entire axial inner surface of the stator winding 2 coil, thereby increasing the heat exchange contact area between the cooling medium and the stator winding 2, and cooling the stator winding coil.

[0085] like Figure 1 As shown, the oil pipe body 100 has a cavity inside to facilitate the flow of cooling medium. In order to cool down all stator coils, the oil pipe body 100 is arranged around the circumference of the stator winding 2, and the stator winding 2 is surrounded therein, so that after the cooling medium is sprayed out from the oil pipe body 100, the flow direction is changed by the blocking member and then sprayed onto the axial inner surface of each coil of the stator winding 2. The cooling medium flows along the inner surface of the stator winding coil and flows out from both ends of the coil, thereby increasing the heat exchange contact area between the cooling medium and the stator winding 2, so that the cooling medium takes away the heat generated by the stator coil as much as possible, thereby achieving stator cooling and avoiding excessively high temperature in the middle of the coil of the stator winding 2 and excessive temperature difference at both ends.

[0086] In order to realize the above-mentioned surrounding arrangement of the oil pipe body 100 on the stator winding 2, the oil pipe body 100 may be an annular structure, such as Figure 1 As shown, the oil pipe body 100 is disposed around the exterior of the stator winding 2 and coaxially with the stator winding 2. A plurality of oil injection holes 102 are provided on the side of the oil pipe body 100 facing the stator winding 2. The axis inclination direction and angle of the oil injection holes 102 are determined based on the installation location of the oil pipe body 100. The cross-sectional shape of the oil pipe body 100 can be circular or polygonal, that is, the cross-sectional shape of the oil pipe body 100 can be circular, elliptical, square, trapezoidal, or other shapes, depending on actual needs and not specified here. When the oil pipe body 100 has an annular structure, it has at least one oil inlet 101 to supply cooling medium to the oil pipe body 100. The oil inlet 101 can be located on a side of the oil pipe body 100 away from the oil injection holes 102, or on a side of the oil pipe body 100 perpendicular to the side of the oil injection holes 102. Other configurations are also possible, depending on actual needs and not specified here.

[0087] Or, as Figure 2 As shown, there are multiple oil pipe bodies 100, which are arranged in a ring-shaped pattern around the axis of the stator winding 2. The multiple oil pipe bodies 100 form a ring-shaped structure, surrounding the stator winding 2 along its axial direction. Each oil pipe body 100 is provided with multiple oil injection holes 102 on the side facing the stator winding 2, and each oil pipe body 100 is provided with at least one oil inlet 101. This allows cooling medium to flow through each oil pipe body 100. The oil injection holes 102 of each oil pipe body 100 spray cooling medium, cooling the coils of the stator winding 2 from different positions and angles. The cross-sectional shape of any oil pipe body 100 can be circular or polygonal, i.e., the cross-sectional shape of any oil pipe body 100 can be circular, elliptical, square, trapezoidal, or other shapes, depending on actual needs and not specified herein. For example, there are two oil pipe bodies 100, which are arranged along the circumference of the stator winding 2 and surround the circumference of the stator winding 2. Each oil pipe body 100 is provided with a plurality of oil spray holes 102 on the side facing the stator winding 2 to spray the cooling medium on the coils of the stator winding 2. The oil inlets 101 of the two oil pipe bodies 100 are arranged relatively close to each other, so that the oil inlets 101 of the two oil pipe bodies 100 can be connected to the same external oil inlet pipe for the input of cooling medium.

[0088] Preferably, in this embodiment, the cross-section of the oil pipe body 100 is square, which makes it easy to adjust the position and angle of the oil injection hole 102 (the outflow line 104 of the cooling medium), and the oil injection hole 102 is easy to operate during processing.

[0089] The cross-sectional shape of the internal cavity of the oil pipe body 100 can be the same as the cross-sectional shape of the oil pipe body 100, or the cross-sectional shape of the internal cavity of the oil pipe body 100 can be different from the cross-sectional shape of the oil pipe body 100. It is set according to actual needs and no specific requirements are made here.

[0090] The above-mentioned blocking member has a guide portion 300, which is arranged opposite to the oil injection hole 102. The cooling medium sprayed obliquely from the oil injection hole 102 flows in the cooling medium flow cavity and splashes on the guide portion 300 of the blocking member. The guide portion 300 blocks the cooling medium. Figure 7-13As shown, the direction of the cooling medium flow line 104 is changed, and the cooling medium splashed on the guide part 300 is guided, so that the flow direction of the cooling medium is changed from a state of being obliquely intersected with the axial direction of the stator winding 2 to a state roughly parallel to the axis of the stator winding 2, and the cooling medium is divided into two parts. The two parts of the cooling medium flow along the axial inner surface of the coil of the stator winding 2, one part of the cooling medium flows toward one end of the stator winding 2, and the other part of the cooling medium flows toward the other end of the stator winding 2, wherein the cooling medium flowing away from the axial oil supply device 1 is relatively large, so that the cooling medium can flow through the entire axial inner surface of the stator winding coil; at the same time, the guide part 300 of the blocking member guides the flow of the cooling medium at the two ends of the stator winding 2, so that the cooling medium flows to the two ends of the multiple groups of coils located in the slots of the same stator core 4, and flows out from both ends.

[0091] like Figure 14 and 15 As shown, when the blocking member is a slot wedge 3, the slot wedge 3 has a slot wedge body, which is a plate-shaped structure. The guide portion 300 is provided on one side of the slot wedge body, and the number of the guide portions 300 is two, which are symmetrically provided on the same side of the slot wedge body. The plane where the guide portion 300 is located intersects with the side of the slot wedge body, and the planes where the two guide portions 300 are located also intersect, so that the two guide portions 300 are convexly provided on one side of the slot wedge body. The plane transition at the connection of the two guide portions 300 makes the cross-sectional shape of the structure formed by the two guide portions 300 and the slot wedge body a trapezoidal shape, that is, the cross-sectional shape of the slot wedge 3 It is trapezoidal, and the guide portion 300 is arranged opposite to the oil injection hole 102, so that the cooling medium splashed onto the guide portion 300 flows in two directions, so that the flow direction of the cooling medium is changed from a state of oblique intersection with the axial direction of the stator winding 2 to a state roughly parallel to the axis of the stator winding 2, so that the cooling medium is split at the end of the stator winding 2 close to the axial oil supply device 1, divided into two parts, and flows along the axial inner surface of the coil, one part flows toward one end of the stator winding, and the other part flows toward the other end of the stator winding, flowing through each coil of the stator winding 2, and cooling each coil of the stator winding 2.

[0092] The height L of the slot wedge 3 is adapted to the height of the stator winding 2. Specifically, the height L of the slot wedge 3 is greater than the height of the teeth of the stator core 4. The closer the height L of the slot wedge 3 is to the ends of the stator winding 2, the more coolant splashes onto the slot wedge 3, and the more coolant is directed to the ends of the stator winding 2, resulting in a larger heat dissipation contact area. The height L of the slot wedge 3 is selected based on actual needs and is not specified here.

[0093] The width W of the slot wedge 3 is adapted to the width of the slots in the stator core 4. The closer the width W of the slot wedge 3 is to the width of the slots in the stator core 4, the more cooling medium is concentrated at the ends of the stator winding 2, and the larger the cooling medium distribution area. The width W of the slot wedge 3 is selected based on actual needs and is not specified here.

[0094] like Figure 16 As shown, when the blocking member is a skeleton 8, the skeleton 8 is mounted on the tooth portion of the stator core 4, and the two adjacent skeleton guide parts 800 block the slots of the stator core 4 to prevent the stator winding 2 from coming out of the slots of the stator core 4. At the same time, the cooling medium splashed onto the skeleton guide parts 800 flows in two directions, so that the flow direction of the cooling medium is changed from a state of oblique intersection with the axial direction of the stator winding 2 to a state roughly parallel to the axis of the stator winding 2, so that the cooling medium is diverted at the end of the stator winding 2 close to the axial oil supply device 1, divided into two parts, and flows along the axial inner surface of the coil, one part flows toward one end of the stator winding 2, and the other part flows toward the other end of the stator winding 2, flows through each coil of the stator winding 2, and cools each coil of the stator winding 2.

[0095] A concentrated winding motor comprises the above-mentioned concentrated winding axially cooled motor stator.

[0096] The following examples are used to illustrate this in detail.

[0097] For example, the oil pipe body 100 is made into an annular structure with a square cross-section, that is, the oil pipe body 100 is an annular tubular structure, and the cross-section is square, and the cross-section of the internal cavity is circular. The oil pipe body 100 is fixedly installed in the yoke space at one end of the stator core 4 and is located at the outlet end 6 of the stator winding 2. A plurality of oil injection holes 102 are provided on the side of the oil pipe body 100 facing the stator winding 2. The position of each oil injection hole 102 corresponds to a slot of the stator core 4. The axis of the oil injection hole 102 is arranged to intersect obliquely with the axis of the stator winding 2, that is, the cooling medium sprayed from the oil injection hole 102 is sprayed obliquely toward the non-outlet end 6 of the stator winding 2. Under the action of pressure, the cooling medium is sprayed from the oil injection hole 102 and flows in the cooling medium circulation cavity. The cooling medium moves to the slot wedge 3 and contacts the guide portion 300 of the slot wedge 3. Since the guide portion 300 is inclined and there are two guide portions 300, the cooling medium is diverted and the direction of the cooling medium's outflow line 104 is changed. Part of the cooling medium flows toward the output terminal 6 of the stator winding 2, and part flows toward the non-output terminal 7 of the stator winding 2. Each portion of the cooling medium flows along the axial inner surface of the coil and flows out from both ends of the stator winding 2. This increases the heat exchange contact area between the cooling medium and the stator winding 2, improves the heat dissipation capacity, and solves the problems of excessive temperature rise in the middle of the concentrated winding coil and excessive temperature difference between the two ends, thereby improving the power density. The axial oil supply device 1 is installed on the yoke of the stator core 4, fully utilizing the space of the motor stator yoke and improving the space utilization of the housing. The cooling medium is preferably gearbox lubricant. After flowing out of the gearbox, the gearbox lubricant enters the axial oil circuit structure to cool the motor stator, making the gearbox oil circuit design simple, requiring less space, and easy to implement.

[0098] The simulation results of using axial spraying of cooling medium to cool the gap are compared with the existing radial spraying of the stator end and the middle of the core to cool the stator. Figure 19 and 20 As shown in the figure, the two simulation schemes use the same cooling oil flow rate, the same cooling oil temperature, and the motor works under the same working conditions. The results are: radial spray stator end and the middle of the core: the maximum stator temperature is 174℃ (located in the middle of the stator), and the stator end winding is 166℃; axial spray gap: the maximum stator temperature is 136℃ (located in the middle of the stator), and the stator end winding is 130℃.

[0099] From this we can know that the cooling effect is better when axial spraying is used.

[0100] Due to the adoption of the above technical scheme, the structure of the concentrated winding axial cooling motor stator is simple and easy to use. The axial oil supply device has an oil pipe body with an internal cavity, and a plurality of oil spray holes are provided on the side of the oil pipe body facing the stator winding. The oil pipe body is arranged around the circumference of the stator winding, and the oil pipe body is installed on the yoke space at either end of the motor stator, making full use of the stator yoke and being fixed to the housing together with the stator, thereby improving space utilization; alternatively, the axial oil supply device is installed on the housing, or the axial oil supply device is integrated on the housing, and the axial oil supply device corresponds to the position of the stator yoke when the motor stator is installed, making full use of the internal space of the housing and improving space utilization of the housing; the axial oil supply device is located at the output end or non-output end of the motor stator, and the cooling medium is sprayed from one end of the motor stator, and the axis of the oil spray hole of the axial cooling structure is arranged to intersect obliquely with the axis of the stator winding, so that the cooling medium outflow line is inclined to spray toward the other end of the motor stator, and is sprayed by the stator iron after passing through the stator winding coil. The blocking member in the core slot blocks the cooling medium, and the blocking member has a guide part to divert the cooling medium and change the flow direction of the cooling medium, so that the cooling medium is directly sprayed onto the axial inner surface of the concentrated winding stator coil, and flows along the axial inner surface of the coil to the two ends of the stator winding, and flows out from the two ends, thereby increasing the heat exchange contact area between the cooling medium and the winding, and improving the heat dissipation capacity. The cooling medium flows through the entire axial inner surface of the coil, which solves the problems of excessive temperature rise in the middle of the concentrated winding coil and excessive temperature difference between the two ends, and improves the power density; the inclination angle of the axis of the oil injection hole is different, and the flow rate of the cooling medium flowing to the two ends is different. Different oil outlet angles can adjust the flow distribution of the axial flow to the two ends, so that the axial oil supply device can cool different types of stator windings and has a wide range of applications; gearbox lubricating oil is used as the cooling medium. After the lubricating oil flows out of the gearbox, it enters the axial oil supply device to cool the motor stator, making the gearbox oil circuit design simpler, requiring less space, and easier to implement.

[0101] The embodiments of the present invention are described in detail above, but the contents described are only preferred embodiments of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A concentrated winding axially cooled motor stator, provided on a housing, comprising a stator core and a stator winding, wherein the stator winding is provided on the stator core, characterized in that: It also includes a blocking member and an axial oil supply device, wherein, The blocking member is provided on the stator core and contacts the stator winding to block the slot of the stator core; The axial oil supply device is provided at either end of the stator core, or the axial oil supply device is connected to the housing, and the position of the axial oil supply device corresponds to either end of the stator core; and An oil spray hole is provided on a side of the axial oil supply device close to the stator winding, and the axis of the oil spray hole is arranged to obliquely intersect with the axis of the stator winding, so that the outflow line of the cooling medium is in an inclined state, extending from the oil spray hole to one end of the axis of the stator winding, and spraying onto the blocking member and / or the stator winding, so that the cooling medium flows along the axial inner surface of the stator winding toward both ends of the stator winding; The axis of the oil injection hole extends obliquely from the oil injection hole toward an end away from the stator winding where an axial oil supply device is provided.

2. The concentrated winding axially cooled motor stator according to claim 1, characterized in that: The blocking member and the two adjacent groups of stator winding coils located in the slots of the stator core form a cooling medium circulation cavity, and the oil injection hole corresponds to the cooling medium circulation cavity. The blocking member blocks the cooling medium flowing out of the oil injection hole and guides the flow path of the cooling medium so that the cooling medium flows along the axial inner surface of the stator winding toward the two ends of the stator winding.

3. The concentrated winding axially cooled motor stator according to claim 2, characterized in that: There are multiple oil spray holes, and each of the cooling medium circulation cavities corresponds to the position of at least one of the oil spray holes; Alternatively, the plurality of oil spray holes are arranged such that adjacent oil spray holes are spaced apart by one cooling medium circulation cavity; Alternatively, the plurality of oil spray holes are arranged as follows: some of the oil spray holes correspond to some of the cooling medium circulation cavities, and in another portion of the oil spray holes, adjacent oil spray holes are arranged with one cooling medium circulation cavity between them, so that each coil of the stator winding is sprayed with cooling medium.

4. The concentrated winding axially cooled motor stator according to any one of claims 1 to 3, characterized in that: The axial oil supply device further includes: An oil pipe body, wherein a cavity is provided inside the oil pipe body, and the oil spray hole is connected to the cavity inside the oil pipe body to facilitate the flow of cooling medium; An oil inlet is connected to the oil pipe body and communicates with an internal cavity of the oil pipe body to facilitate the entry of cooling medium into the oil pipe body.

5. The concentrated winding axially cooled motor stator according to claim 4, characterized in that: The cross-sectional shape of the oil pipe body is circular or polygonal.

6. The concentrated winding axially cooled motor stator according to claim 5, characterized in that: The oil pipe body is an annular structure, or the oil pipe body is multiple, and the multiple oil pipe bodies are arranged in an annular shape with the axis of the stator winding as the center.

7. The concentrated winding axially cooled motor stator according to any one of claims 1 to 3 and 5 to 6, characterized in that: The blocking member has a guide portion, which is arranged opposite to the oil injection hole and is used to change the flow direction of the cooling medium.

8. The concentrated winding axially cooled motor stator according to claim 4, characterized in that: The blocking member has a guide portion, which is arranged opposite to the oil injection hole and is used to change the flow direction of the cooling medium.

9. The concentrated winding axially cooled motor stator according to claim 7, characterized in that: The blocking member is a slot wedge, a frame or insulating paper.

10. A concentrated winding motor, characterized in that: The invention comprises the concentrated winding axially cooled motor stator according to any one of claims 1 to 9.

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