Motor winding structure
By designing a stepped structure at the end of the motor winding, the problem of cooling oil in the prior art cannot be uniformly covered, achieving uniform cooling of the winding and increasing the motor power density.
Patent Information
- Application Number
- CN202411830064.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-03-18
AI Technical Summary
The oil-cooling cooling method of existing motors is high in the winding end height, resulting in the cooling oil not being evenly covered, resulting in uneven distribution of winding temperature rise, limiting the increase in the motor power density.
The end of the transposition winding adopts a stepped structure in the axial direction, the end of the winding located at the bottom of the groove is lower than the end of the winding located at the top of the groove, and decreases layer by layer, increasing the contact area of the cooling oil and promoting oil flow and heat exchange.
Through the end step structure, the uniform flow and heat exchange of cooling oil on the winding are improved, the winding temperature difference is reduced, and the heat dissipation ability and power density of the motor winding are improved.
Smart Images
Figure CN119651962A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of motor cooling. Background Art
[0002] At present, the main forms of motor cooling are air cooling, water cooling, oil cooling, and other mixed cooling methods to improve the power density of the motor. Since the motor winding is the hub for realizing electromechanical energy conversion, the temperature of the winding is higher than that of other parts on the motor. In the prior art, the cooling method used for flat wire motor windings is oil cooling. Winding cooling is mainly a method of removing heat by spraying oil at the end, which can improve the cooling and heat dissipation efficiency of the winding. The transposed winding motor has a higher end winding height due to the transposed structure of the winding. The cooling oil sprayed at the end of the conventional stator winding cannot evenly cover the end winding, making the temperature of some areas of the end winding higher. When oil cooling is used, the cooling fluid medium cannot directly contact the high temperature points of the winding in the stator slot, and the oil spray pipeline design makes it difficult to evenly cover the end winding with cooling oil, which seriously affects the heat dissipation effect of the motor, thereby reducing the energy conversion efficiency of the motor, thereby limiting the further improvement of the motor power density.
[0003] Take the winding structure of the transposed winding motor as an example to illustrate: Figure 1 The winding structure is transposed close to the slot, with the outermost winding close to the slot bottom and the inner winding close to the slot. Figure 2 This is a cross-sectional view of the transposed winding end structure. The outermost winding is L1, the notch is the eighth winding layer is L8, the end heights of the L1 to L6 windings are the same, and the end heights of the L7 and L8 windings are higher than those of other layers. Due to the high height of the end windings of the transposed winding motor, it is difficult to increase the uniform coverage of the cooling oil on the windings by using the end windings for oil spray cooling, resulting in uneven distribution of the winding temperature rise, which can easily lead to local overheating of the motor windings, which will limit the improvement of the motor power density. Summary of the invention
[0004] The present invention aims to solve the problem that the oil cooling method of the existing motor is subject to temperature rise limit requirements, and the cooling structure is difficult to further improve the uniform cooling effect of the motor winding, resulting in uneven distribution of the motor temperature rise. A motor winding structure is now provided.
[0005] A motor winding structure is a transposed winding, the end of the motor winding structure is a stepped structure along the axial direction, and the winding end located at the bottom of the slot is lower than the winding end located at the top of the slot.
[0006] Furthermore, the winding located at the bottom of the slot decreases layer by layer to the winding end located at the top of the slot.
[0007] Furthermore, the motor winding structure includes a multi-layer winding combination, and the windings in the same combination are adjacent and have the same end height.
[0008] Furthermore, the same combination mentioned above includes two layers of windings.
[0009] The motor winding structure described in the present invention has a stepped structure at the end, which increases the contact area of the cooling oil on the winding, can promote the uniform flow of the cooling oil on the end winding, indirectly increase heat exchange, and improve the cooling effect of the cooling medium on the winding structure, thereby achieving a small temperature difference at the end winding, and further improving the heat dissipation capacity of the motor winding. In addition, the end stepped winding structure meets the installation requirements of the internal space of the motor in a limited space. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 The schematic diagram of the transposed winding motor structure described in the background technology;
[0011] Figure 2 A cross-sectional view of the transposed winding end structure described in the background technology;
[0012] Figure 3 This is a schematic diagram of the structure of the transposed winding motor described in the third specific implementation mode;
[0013] Figure 4 This is a schematic diagram of the stepped structure of the transposed winding end portion described in the third specific implementation mode;
[0014] Figure 5 This is a cross-sectional view of the stepped structure of the transposed winding end described in the third specific implementation mode.
[0015] Among them, 1 is the winding end, 2 is the stator core, 3 is the stator core cooling pipe, and 4 is the winding oil injection pipe. DETAILED DESCRIPTION
[0016] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.
[0017] Specific implementation method 1: The motor winding structure described in this implementation method is a transposed winding, and the end of the motor winding structure is a stepped structure along the axial direction, and the winding end at the bottom of the slot is lower than the winding end at the top of the slot. The winding at the bottom of the slot to the winding end at the top of the slot decreases layer by layer.
[0018] Specific implementation method 2: A motor winding structure described in this implementation method is a transposed winding, the end of the motor winding structure is a stepped structure along the axial direction, and the winding end at the bottom of the slot is lower than the winding end at the top of the slot. The motor winding structure includes a multi-layer winding combination, and the windings in the same combination are adjacent and have the same end height.
[0019] Specific implementation method three: refer to Figures 3 to 5 Specifically describe this embodiment, this embodiment uses the end step structure of the transposed winding as an example. The outermost winding is close to the bottom of the slot, and the two layers close to the slot are the inner transposed windings. The outermost winding is L1, the second layer is L2, and so on, until the eighth layer at the slot is L8.
[0020] The L1 layer winding and the L2 layer end winding have the same height, the L3 layer winding and the L4 layer end winding have the same height, but the L3 layer winding and the L4 layer winding are higher than the L1 layer winding and the L2 layer winding, the L5 layer winding and the L6 layer end winding have the same height, but the L5 layer winding and the L6 layer winding are higher than the L3 layer winding and the L4 layer winding, the L7 layer winding and the L8 layer end winding have the same height, and the L7 layer winding and the L8 layer winding are higher than the L5 layer winding and the L6 layer winding. In this way, the winding height increases from top to bottom in a stepped shape.
[0021] In practical applications, spraying oil on the end of the motor winding structure described in this embodiment can promote the flow of oil for heat exchange, reduce the temperature of the bottom winding, and help improve the cooling and heat dissipation capacity of the end winding, further improving the power density of the motor.
[0022] Furthermore, the heights of the windings L1, L2, L3, and L4 can be the same, the heights of the windings L5 and L6 can be greater than those of the windings L1, L2, L3, and L4, and the heights of the windings L7 and L8 can be greater than those of the windings L5 and L6. This step-shaped structure is beneficial to winding cooling.
[0023] To sum up, the winding described in the present invention is a transposed winding, and the winding end structure is stepped. A suitable winding end step structure can be selected to spray the cooling oil in the oil injection pipe to the end winding, thereby effectively improving the cooling efficiency of the motor winding and overcoming the problem of overcooling or insufficient cooling of some winding areas; at the same time, the end winding structure can meet the installation requirements of the internal space of the motor.
[0024] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that the features described in conjunction with a single embodiment may be used in other described embodiments.
Claims
1. A motor winding structure, wherein the motor winding structure is a transposed winding, characterized in that: The end of the motor winding structure is in a stepped structure along the axial direction, and the winding end located at the bottom of the slot is lower than the winding end located at the top of the slot.
2. A motor winding structure according to claim 1, characterized in that: The winding at the bottom of the slot decreases layer by layer to the winding end at the top of the slot.
3. The motor winding structure according to claim 1, characterized in that: The motor winding structure comprises a multi-layer winding combination, wherein the windings in the same combination are adjacent and have the same end height.
4. A motor winding structure according to claim 3, characterized in that: The same combination contains two layers of windings.