Motor winding and motor

Abstract

The motor winding comprises a stator assembly, a supporting assembly and a heat conduction assembly, and the stator assembly is provided with a plurality of connecting grooves; the supporting assembly comprises a plurality of slot wedges and separators, one ends of the slot wedges are inserted into the connecting grooves, the other ends of the slot wedges extend out of the connecting grooves in the axial direction, the slot wedges form an annular supporting structure, and the separators are arranged outside the supporting structure in a sleeving mode to form an inner ring of the heat conduction cavity; the heat conduction assembly comprises a heat conduction part, a cooling pipeline and a heat transfer part, the heat conduction part is connected with the stator assembly to form an outer ring of the heat conduction cavity, and the cooling pipeline penetrates through the heat conduction part which fills the heat conduction cavity. The motor includes a motor winding. According to the motor winding provided by the invention, the slot wedge is mounted on the stator assembly, and the heat transfer piece is filled between the slot wedge and the heat conduction piece, so that heat of the end part of the motor winding can be transferred to the cooling pipeline through the heat transfer piece and the heat conduction piece, and the problem of poor heat dissipation of the end part is effectively solved.

Description

Technical Field

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

[0002] In order to improve performance indicators such as power density, permanent magnet motors now have increased their thermal load, resulting in increased temperature. This will cause the motor insulation to always be in a high-temperature working state, greatly reducing the motor's service life.

[0003] Traditional permanent magnet motors often use in-slot water cooling or in-slot water cooling plus base water cooling composite cooling technology to cool the motor. However, the heat at the winding end is difficult to transfer, which increases the temperature of the motor winding end and affects the service life of the motor. Summary of the invention

[0004] The purpose of the present invention is to overcome the above technical deficiencies and to provide a motor winding and a motor to solve the technical problem of poor heat dissipation at the winding end of a permanent magnet motor in the prior art.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a motor winding, comprising: a stator assembly, a support assembly and a heat conduction assembly, The stator assembly has a plurality of connection slots, and the connection slots are arranged in an annular structure around the central axis of the motor winding; The support assembly includes a plurality of slot wedges and a separator, wherein the slot wedges correspond to the connection slots one by one, one end of the slot wedge is inserted into the connection slot, and the other end thereof extends axially to the outside of the connection slot, and the plurality of slot wedges form an annular support structure, and the separator is sleeved outside the support structure to form an inner ring of the heat conduction cavity; The heat conduction assembly comprises a heat conduction member, a cooling pipe and a heat transfer member. The heat conduction member is connected to the stator assembly to form an outer ring of a heat conduction cavity. The cooling pipe runs through the heat conduction member. The heat transfer member fills the heat conduction cavity.

[0006] In some embodiments, the motor winding is a symmetrical structure at both ends, the connecting slots are arranged parallel to the central axis, and two ends of each connecting slot are respectively connected to two slot wedges.

[0007] In some embodiments, the stator assembly includes a frame and a stator core, the stator core is arranged around the central axis and has the connecting groove, the stator core is fixedly connected to the frame, and the heat conductor is fixedly connected to the frame.

[0008] In some embodiments, the stator core is formed by stacking a plurality of stator punching sheets, a yoke of the stator punching sheet is formed with an open slot, and the cooling pipe passes through each of the open slots in sequence.

[0009] In some embodiments, the separator has insulating properties.

[0010] In some embodiments, the heat transfer element is a potting compound, and the heat conduction cavity is filled with the heat transfer element through a vacuum potting process.

[0011] In some embodiments, the motor winding is a rotationally symmetrical structure around the central axis, and the connecting grooves and the slot wedges are arranged in a circular ring structure around the central axis.

[0012] In some embodiments, a collector ring assembly is also included, which includes a fixing frame and a collector ring. Two fixing frames are symmetrically arranged at both ends of the frame, and the fixing frames are insulating. The collector ring is sleeved on the fixing frames.

[0013] In some embodiments, a connecting piece is further included, and an end of the slot wedge away from the connecting slot is connected to the fixing frame through the connecting piece.

[0014] In a second aspect, the present invention further provides a motor, comprising a motor winding.

[0015] Compared with the prior art, the motor winding provided by the present invention installs slot wedges on the stator assembly and fills heat transfer parts between the slot wedges and the heat conductor. The heat at the end of the motor winding can be transferred to the cooling pipe through the heat transfer parts and the heat conductor, and then carried away by the coolant in the cooling pipe, thereby effectively solving the problem of poor heat dissipation at the end. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the structure of a motor winding provided by an embodiment of the present invention; Figure 2 yes Figure 1 The enlarged view of point A in the middle; Figure 3 It is a partial cross-sectional view of the motor winding end provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0018] In order to solve the technical problem of poor heat dissipation at the end of a motor winding, the present invention provides a motor winding, the end of the motor winding has good heat dissipation performance and can extend the service life of the motor winding.

[0019] See also Figures 1 to 3 , Figure 1is a schematic diagram of the structure of a motor winding provided by an embodiment of the present invention; Figure 2 yes Figure 1 The enlarged view of point A in the middle; Figure 3 It is a partial cross-sectional view of the motor winding end provided by an embodiment of the present invention.

[0020] The motor winding has a central axis, and comprises a stator component 1 , a support component 2 and a heat conduction component 3 .

[0021] The stator assembly 1 has a plurality of connection slots 11 , which are arranged in an annular structure around the central axis of the motor winding.

[0022] The support assembly 2 includes a plurality of slot wedges 21 and a separator 22. The slot wedges 21 correspond to the connection slots 11 one by one. One end of the slot wedge 21 is inserted into the connection slot 11, and the other end extends axially to the outside of the connection slot 11. The plurality of slot wedges 21 form an annular support structure. The separator 22 is sleeved outside the support structure to form an inner ring of the heat conduction cavity.

[0023] The heat conducting assembly 3 includes a heat conducting member 31, a cooling pipe 32 and a heat transfer member 33. The heat conducting member 31 is connected to the stator assembly 1 to form an outer ring of a heat conducting cavity. The cooling pipe 32 runs through the heat conducting member 31. The heat transfer member 33 fills the heat conducting cavity.

[0024] When the motor winding is working, the heat generated at the end can be transferred to the cooling pipe 32 through the heat transfer member 33 and the heat conductive member 31, and then taken away by the coolant in the cooling pipe 32, thereby effectively solving the problem of poor heat dissipation at the end.

[0025] See also Figure 1 In some embodiments, the motor winding is a symmetrical structure at both ends, that is, both ends of the stator component 1 are connected to the same support component 2 and heat conduction component 3, and the heat is dissipated at both ends of the stator component 1, that is, the two ends of the motor winding. Accordingly, the connecting slots 11 are arranged parallel to the central axis, and two slot wedges 21 are connected to the two ends of each connecting slot 11.

[0026] In some embodiments, the motor winding is a rotationally symmetrical structure around the central axis, and accordingly, the connecting slots 11 and the slot wedges 21 are arranged in a circular ring structure around the central axis. The inner ring composed of the separators 22 and the outer ring composed of the heat conducting member 31 are also circular ring structures.

[0027] In some embodiments, the stator assembly 1 includes a frame 12 and a stator core 13 . The stator core 13 is arranged around the central axis and has a connecting slot 11 . The stator core 13 is fixedly connected to the frame 12 .

[0028] In some embodiments, the stator core 13 is formed by laminating a plurality of stator punching sheets. It is easy to understand that the stator punching sheets have slots for forming the connection slots 11. In this embodiment, the yoke of the stator punching sheets is formed with open slots, and the cooling pipe 32 passes through each open slot in sequence. The heat generated by the stator punching sheets can also be directly taken away by the coolant through the cooling pipe 32, further improving the heat dissipation performance.

[0029] In some embodiments, along the central axis direction, the end of the slot wedge 21 away from the connecting slot 11 exceeds the heat conducting member 31, that is, Figure 1 From the perspective of FIG. 1 , the upper end of the slot wedge 21 at the upper end is higher than the heat conducting member 31 .

[0030] In some embodiments, the separator 22 has insulating properties. For example, NMN insulating paper may be used. NMN insulating paper is a soft composite material composed of a middle layer of polyester film and Nomex paper on both sides, with a heat resistance grade of F (155°C), and has good mechanical properties, such as tensile strength and edge tear resistance, as well as good electrical strength.

[0031] In some embodiments, the heat conducting member 31 is fixedly connected to the frame 12. In this embodiment, the heat conducting member 31 is installed on the frame 12 by screws. In other embodiments, feasible connection methods such as adhesion, welding, and clamping can also be used. It is easy to understand that the heat conducting member 31 has good thermal conductivity and can be made of metal. At the same time, in order to avoid rust, the material is preferably stainless steel.

[0032] The heat conducting member 31 may be an integral structure or a combined structure composed of a plurality of monomers. A channel for accommodating the cooling pipe 32 is formed inside the heat conducting member 31. In order to facilitate the installation of the cooling pipe 32, a gap exists between the cooling pipe 32 and the heat conducting member 31. In order to improve the heat transfer efficiency between the cooling pipe 32 and the heat conducting member 31, in this embodiment, the gap between the cooling pipe 32 and the heat conducting member 31 is filled by a vacuum pressure dipping process.

[0033] In some embodiments, the coolant in the cooling pipe 32 is pure water, and in other embodiments, mineral oil or other coolants may also be used. Similar to the heat conducting member 31, the cooling pipe 32 needs to have good thermal conductivity and can be made of metal. At the same time, in order to avoid rust, the material is preferably stainless steel.

[0034] In some embodiments, the heat transfer element 33 is a potting glue, and the heat transfer cavity is filled with the heat transfer element 33 through a vacuum potting process. Under vacuum conditions, bubbles in the heat transfer element 33 can be reduced. At the same time, it is best to heat during the potting process to improve the thermal conductivity of the heat transfer element 33. The heat transfer element 33 can be made of epoxy resin or silicone grease. And when potting the heat transfer element 33, the heat transfer element 33 cannot exceed the heat transfer element 31. That is, according to Figure 1From the perspective in FIG. 1 , the height of the upper heat conducting member 33 is slightly lower than that of the heat conducting member 31 .

[0035] In some embodiments, the motor winding further includes a collector ring assembly 4, which includes a fixing frame 41 and a collector ring 42. Two fixing frames 41 are symmetrically arranged at both ends of the frame 12, and two collector rings 42 are respectively sleeved on the two fixing members 41. The fixing frame 41 is insulating and made of insulating material, such as epoxy board.

[0036] In some embodiments, the motor winding further comprises a connecting member 5, and the end of the slot wedge 21 away from the connecting slot 11 is connected to the fixing frame 41 through the connecting member 5 to enhance the connection strength of the slot wedge 21 after installation. This prevents displacement when the heat transfer element 33 is potted, thereby affecting the potting effect. In this embodiment, the connecting member 5 uses a binding belt 8 to bind the slot wedge 21 and the fixing frame 41. In other embodiments, other methods such as rods and plates can also be used to connect the slot wedge 21 and the fixing frame 41, as long as the connection strength of the slot wedge 21 after installation can be enhanced.

[0037] In other embodiments, the present invention further provides a motor, comprising the above-mentioned motor winding.

[0038] In order to better understand the present invention, the following Figures 1 to 3 The technical solution of the present invention is described in detail: The motor winding adopts the above structure, and the heat generated at both ends during operation can be transferred to the cooling pipe 32 through the heat transfer member 33 and the heat conductive member 31, and then taken away by the coolant in the cooling pipe 32. The problem of poor heat dissipation at the ends is effectively solved, the excessive temperature caused by heat accumulation at the ends is avoided, and the service life of the motor winding is extended.

[0039] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A motor winding, characterized in that: It includes: A stator assembly having a plurality of connection slots arranged in an annular structure around a central axis of the motor winding; A support assembly, comprising a plurality of slot wedges and a separator, wherein the slot wedges correspond to the connection slots one by one, one end of the slot wedge is inserted into the connection slot, and the other end thereof extends axially to the outside of the connection slot, and the plurality of slot wedges form an annular support structure, and the separator is sleeved outside the support structure to form an inner ring of the heat conduction cavity; as well as The heat conduction component comprises a heat conduction member, a cooling pipe and a heat transfer member, wherein the heat conduction member is connected with the stator component to form an outer ring of a heat conduction cavity, the cooling pipe runs through the heat conduction member, and the heat transfer member fills the heat conduction cavity.

2. The motor winding according to claim 1, characterized in that: The motor winding is a symmetrical structure at both ends, the connecting slots are arranged parallel to the central axis, and two ends of each connecting slot are respectively connected to two slot wedges.

3. The motor winding according to claim 2, characterized in that: The stator assembly comprises a frame and a stator core, the stator core is arranged around the central axis and has the connecting groove, the stator core is fixedly connected to the frame, and the heat conducting member is fixedly connected to the frame.

4. The motor winding according to claim 3, characterized in that: The stator core is formed by stacking a plurality of stator punching sheets, a yoke of the stator punching sheets is formed with open slots, and the cooling pipe passes through each of the open slots in sequence.

5. The motor winding according to claim 1, characterized in that: The separator has insulating properties.

6. The motor winding according to claim 1, characterized in that: The heat transfer element is potting glue, and the heat conduction cavity is filled with the heat transfer element through a vacuum potting process.

7. The motor winding according to claim 1, characterized in that: The motor winding is a rotationally symmetrical structure around the central axis, and the connecting grooves and the slot wedges are arranged in a circular ring structure around the central axis.

8. The motor winding according to claim 3, characterized in that: It also includes a collector ring assembly, which includes a fixing frame and a collector ring. Two fixing frames are symmetrically arranged at both ends of the frame. The fixing frames are insulating, and the collector ring is sleeved on the fixing frames.

9. The motor winding according to claim 8, characterized in that: It also includes a connecting piece, and one end of the slot wedge away from the connecting slot is connected to the fixing frame through the connecting piece.

10. A motor, characterized in that: Comprising the motor winding as claimed in any one of claims 1-9.

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