Motor stator, motor and vehicle power system

Abstract

The utility model provides a motor stator, a motor and a vehicle power system, and the motor stator comprises a stator core which is provided with a plurality of winding installation grooves which penetrate through the stator core in the axial direction of the stator core; the windings are installed in the winding installation grooves, the winding contained in each winding installation groove comprises a plurality of wires, and the wires are arranged in the winding installation grooves in the radial direction of the stator core; the elastic fixing parts integrally extend in the axial direction of the stator core, the windings are installed and positioned in the winding installation grooves through the elastic fixing parts, in the same winding installation groove, the elastic fixing parts are arranged between two adjacent wires, each elastic fixing part comprises a wave-shaped section, the cross section of each wave-shaped section is in a wave shape or an arc shape, and the cross section of each wave-shaped section is in a wave shape or an arc shape. And a gap is formed between two adjacent wires in the same winding mounting groove in the radial direction due to the waveform sections, and the gap forms a cooling oil channel penetrating through the stator core in the axial direction.

Description

Technical Field

[0001] The present application relates to a motor stator, a motor and a vehicle power system. Background Art

[0002] Compared with water-cooled motors, oil-cooled motors allow the oil to directly contact the heat-generating components. For example, cooling oil channels are formed between the wires or between the wires and the winding mounting grooves. The oil flows through the cooling oil channels to directly cool the heat-generating components, allowing the motor to continuously output high power, which has a good development prospect in high-performance vehicles.

[0003] Patent application CN109617319A discloses an oil cooling structure in a flat wire motor slot, in which an oil channel is formed in the gap between the wires of the winding or the gap between the winding and the winding mounting slot. The oil can enter from one axial end of the stator and flow out from the other axial end of the stator, thereby taking away the heat generated by the winding.

[0004] Patent application WO2022236776A1 discloses a flat copper wire and winding for a motor, which forms an oil channel by setting slots on the winding wire. The oil can enter from one axial end of the stator and flow out from the other axial end of the stator, thereby taking away the heat generated by the winding.

[0005] The formation of concave-convex structures on the winding installation grooves or the wires will make their structures complicated, increase the production and assembly costs of the components themselves, and the wire making process is likely to damage the surface coating, posing quality risks.

[0006] Patent application CN108599491A discloses a method and device for filling glue on a motor stator, and patent application CN114039433A discloses a shell-stator assembly of a flat wire motor and its assembly method. They both use colloid to firmly fix the winding in the winding installation slot of the stator core. This can prevent the wire from moving in the winding installation slot under the action of electromagnetic force or other external forces, and prevent problems such as paint wear on the wire surface and abnormal noise.

[0007] The above-mentioned technical solution of using colloid to fix the windings, even if the cooling oil channels formed between the wires or between the wires and the winding mounting grooves are protected, is difficult to completely prevent the glue from penetrating into the cooling oil channels, and the solidified glue is likely to cause blockage of the oil channels. Utility Model Content

[0008] The present application aims to provide a motor stator, a motor and a vehicle power system, so that the manufacturing cost of the motor stator is lower, especially in the formation of cooling oil channels.

[0009] The embodiment of the present application provides a motor stator, comprising:

[0010] A stator core, wherein the stator core is provided with a plurality of winding installation slots penetrating the stator core in an axial direction of the stator core;

[0011] A winding, the winding being installed in the winding installation slot, the winding accommodated in each winding installation slot comprising a plurality of wires, the plurality of wires being arranged in the winding installation slot along the radial direction of the stator core; and

[0012] an elastic fixing member, wherein the elastic fixing member extends along the axial direction of the stator core as a whole, and the winding is installed and positioned in the winding installation groove through the elastic fixing member,

[0013] In the same winding installation groove, the elastic fixing part is arranged between two adjacent conductive wires, and the elastic fixing part includes a corrugated segment, and the cross-section of the corrugated segment is wavy or arc-shaped. The corrugated segment enables a gap in the radial direction between two adjacent conductive wires in the same winding installation groove, and the gap forms a cooling oil channel that penetrates the stator core along the axial direction.

[0014] In at least one possible embodiment, the elastic fixing member further includes two curved sections, the two curved sections are respectively connected to two ends of the waveform section in the width direction, and the two curved sections clamp the wire.

[0015] In a natural state before the elastic fixing piece is deformed by force, the width of the elastic fixing piece along the circumferential direction of the stator core is greater than the width of the winding mounting groove along the circumferential direction, and the elastic fixing piece is squeezed and deformed in the winding mounting groove, so that the elastic fixing piece is installed in the winding mounting groove.

[0016] In at least one possible embodiment, the bending section includes a bending portion, an inner bending section and an outer bending section, the bending portion connects the inner bending section and the outer bending section, the inner bending section is in contact with the wire, the outer bending section is in contact with the side wall of the winding mounting groove, there is a gap between the inner bending section and the outer bending section, and the bending section enables the elastic fixing member to be elastically compressed along the circumferential direction.

[0017] In at least one possible implementation, the bending portion is arc-shaped, and can guide the wire to be inserted between the two bending segments from an opening between the two bending segments.

[0018] In at least one possible embodiment, the elastic fixing member also includes two ends, the two ends are respectively connected to the two curved segments, the curved segments and the ends are located on both sides of the waveform segment in the radial direction of the stator core, and the two curved segments and the two ends respectively clamp the two wires.

[0019] In at least one possible implementation, the two ends form a gradually expanding opening, and the end protrudes toward the inner side between the two ends to form an arc shape.

[0020] In at least one possible implementation manner, the cross section of the wire is generally rectangular, and each side of the cross section of the wire is a straight line.

[0021] In at least one possible implementation, the winding is mounted on the stator core only through the elastic fixing member, and the axial ends of the winding are not fixed by colloid.

[0022] In the axial direction of the motor stator, the length of the elastic fixing member is greater than the length of the stator core, and both axial ends of the elastic fixing member protrude from the axial end surface of the stator core.

[0023] An embodiment of the present application further provides a motor, comprising a motor stator as described in any one of the above technical solutions.

[0024] An embodiment of the present application further proposes a vehicle power system, comprising a motor stator as described in any one of the above technical solutions.

[0025] By adopting the above technical solution, the elastic fixing part can form a cooling oil channel that runs through the stator core between two adjacent wires, without the need to process the oil channel on the wire or winding mounting groove. It is easier to manufacture the elastic fixing part than to process the concave and convex structure on the wire or winding mounting groove, so the manufacturing cost of the motor stator is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A cross-sectional view of a stator of a motor according to an embodiment of the present application is shown.

[0027] Figure 2 Shows Figure 1 A partial enlarged view of .

[0028] Figure 3 A partial enlarged view of a stator of a motor according to an embodiment of the present application is shown.

[0029] Figure 4 A schematic structural diagram of an elastic fixing member of a motor stator according to an embodiment of the present application is shown.

[0030] Figure 5 A cross-sectional view of an elastic fixing member of a motor stator according to an embodiment of the present application is shown.

[0031] Description of Reference Numerals

[0032] 1 stator core 11 winding installation slot 12 isolation strip

[0033] 2 windings 21 wires

[0034] 3 elastic fixing member 31 wave section 32 curved section 321 bending portion 322 bent inner section 323 bent outer section 33 end

[0035] A axial direction C circumferential direction R radial direction DETAILED DESCRIPTION

[0036] In order to more clearly explain the above-mentioned purposes, features and advantages of the present application, the specific implementation methods of the present application are described in detail in this section in conjunction with the accompanying drawings. In addition to the various implementation methods described in this section, the present application can also be implemented in other different ways. Without violating the spirit of the present application, those skilled in the art can make corresponding improvements, deformations and substitutions, so the present application is not limited by the specific embodiments disclosed in this section. The scope of protection of the present application shall be subject to the claims.

[0037] like Figures 1 to 5 As shown, the embodiments of the present application provide a motor stator, a motor and a vehicle power system including the motor stator or the motor, and the vehicle power system can be applied to a pure electric vehicle or a hybrid electric vehicle.

[0038] The vehicle power system includes a motor, the motor includes a stator and a rotor, the stator includes a stator core 1, a winding 2 and an elastic fixing member 3, the winding 2 can be installed on the stator core 1 through the elastic fixing member 3, and the axial ends of the winding 2 can be fixed without using colloid.

[0039] It can be understood that in the following description, unless otherwise specified, the axial direction A refers to the axial direction of the motor stator, and the radial direction R refers to the radial direction of the motor stator.

[0040] like Figure 1 and Figure 3 As shown, the stator core 1 is cylindrical, and the stator core 1 is provided with a winding installation groove 11, which penetrates the stator core 1 along the axial direction A of the stator core 1, and a plurality of winding installation grooves 11 can be provided along the circumferential direction C of the stator. The winding installation groove 11 can be provided at the inner periphery of the stator core 1, and an isolation bar 12 can be provided at the opening of each winding installation groove 11, and the isolation bar 12 can prevent the oil passing through the winding installation groove 11 from leaking to the rotor. The isolation bar 12 can contact the winding 2, and the isolation bar 12 can fix the winding 2 in the radial direction R of the stator, so that the winding 2 is kept in the winding installation groove 11.

[0041] The winding 2 and the elastic fixing member 3 are both arranged in the winding installation slot 11. The winding 2 installed in each winding installation slot 11 may include, for example, a plurality of 8 wires 21. The plurality of wires 21 may be arranged in the winding installation slot 11 along the radial direction R of the motor stator. In the same winding installation slot 11, the elastic fixing member 3 is arranged between two adjacent wires 21. For example, there are 8 wires 21 and 7 elastic fixing members 3 are arranged. The elastic fixing member 3 may be arranged on the radial inner side of each wire 21 except the wire 21 located at the most radial inner side of the winding installation slot 11.

[0042] like Figure 2 and Figure 3 As shown, the cross section of the wire 21 may be a rectangle (including a rounded rectangle), the long side of the rectangle may correspond to the circumferential direction C of the stator core 1, and the short side of the rectangle may correspond to the radial direction R of the stator core 1. Each side of the cross section of the wire 21 may be a straight line without any bend (it can be understood that the edges between two adjacent sides of the wire 21 may form a chamfer), and without a convex or concave structure. Such a wire 21 is easy to manufacture and purchase, and the winding process of the wire 21 to form a winding is simple and the cost is low.

[0043] The wire 21 may be made of a conductive metal material such as copper or a copper alloy. The surface of the wire 21 may be wrapped with insulating paper.

[0044] like Figures 2 to 4 As shown, the elastic fixing member 3 extends as a whole along the axial direction A of the stator core 1. Observing along the cross section of the elastic fixing member 3, the elastic fixing member 3 includes a wave section 31, a curved section 32 and an end 33, the two curved sections 32 are connected to the two ends of the wave section 31 in the width direction, and the two ends 33 are respectively connected to the two curved sections 32. The cross section of the elastic fixing member 3 can be (roughly) H-shaped or I-shaped.

[0045] The curved section 32 and the end 33 are located on both sides of the wave section 31 in the radial direction R of the stator core 1, and the two curved sections 32 and the two end sections 33 respectively clamp the two wires 21. In this embodiment, the curved section 32 is located on the radial outer side of the wave section 31, and the end section 33 is located on the radial inner side of the wave section 31. Of course, the use of the elastic fixing member 3 is not limited to this. For example, the end section 33 can be located on the radial outer side of the wave section 31. For example, referring to Figure 2 The elastic fixing member 3 can be used after being rotated 180 degrees in a clockwise or counterclockwise direction.

[0046] The waveform section 31 may be wavy or arc-shaped, that is, the waveform section 31 has one crest (trough) or multiple crests (troughs). In this embodiment, the waveform section 31 has one crest and two troughs, which can make the processing difficulty of the elastic fixing member 3 relatively small.

[0047] The crest and trough of the wave segment 31 are respectively in contact with the long sides of the cross section of the wire 21 on both sides of the wave segment 31. The wave segment 31 can separate two adjacent wires 21 in the same winding installation slot 11 in the radial direction R of the stator and form a cooling channel between the wave segment 31 and the wire 21, so that the oil can flow through the gap between the two adjacent wires 21 and the wave segment 31 along the axial direction A of the stator, and the oil can directly contact the wire 21 for cooling, and the cooling effect is better.

[0048] The bending section 32 includes a bending portion 321, a bending inner section 322 and a bending outer section 323. The bending portion 321 can connect the bending inner section 322 and the bending outer section 323. The bending inner section 322 and the bending outer section 323 can be parallel or substantially parallel. The bending portion 321 is in an arc shape and can be bent, for example, 180 degrees. There can be a gap between the bending inner section 322 and the bending outer section 323. The bending section 32 enables the elastic fixing member 3 to be elastically compressed along the circumferential direction C of the stator.

[0049] The inner bending section 322 can contact the conductor 21, and the outer bending section 323 can contact the side wall of the winding installation slot 11. In the natural state before the elastic fixing member 3 is deformed by force (i.e., the state before the elastic fixing member 3 is installed on the stator core 1), the distance D1 of the opening formed between the inner bending sections 322 of the two bent sections 32 can be less than or equal to the dimension E of the long side of the cross section of the conductor 21, and the distance between (the circumferential outer side surfaces of) the two outer bending sections 323 can be greater than or equal to the width F of the winding installation slot 11 along the circumferential direction C, so that the two bent sections 32 can clamp (or clamp after deformation) the conductor 21.

[0050] The arc of the bent portion 321 has a guiding function, which allows the wire 21 to be easily inserted from the opening between the two bent sections 32 .

[0051] In a natural state, the minimum dimension D2 of the opening formed between the two ends 33 of the elastic fixing member 3 may be smaller than the dimension E of the long side of the cross section of the wire 21 , so that the two ends 33 may clamp the wire 21 .

[0052] In a natural state, the width D3 of the elastic fixing member 3 along the circumferential direction C (i.e., the distance between the two bent outer sections 323 (circumferential outer sides)) can be greater than or equal to the width F of the winding installation slot 11 along the circumferential direction C. The bent section 32 is elastic by bending to form the bent inner section 322 and the bent outer section 323. The elastic fixing member 3 is squeezed and deformed in the winding installation slot 11. When the elastic fixing member 3 is pressed into the winding installation slot 11, a tool can be used to limit the width of the elastic fixing member 3.

[0053] The two ends 33 of the elastic fixing member 3 can form a gradually expanding opening, so that the two ends 33 can guide the wire 21 to be inserted between the two ends 33. The end 33 can protrude inwardly between the two ends 33 to form an arc shape, and the inwardly protruding part is the narrowest part of the opening formed between the two ends 33.

[0054] like Figure 3 As shown, in the axial direction A of the motor stator, the length of the elastic fixing member 3 can be greater than the length of the stator core 1 , and the axial ends of the elastic fixing member 3 can protrude from the axial end surface of the stator core 1 .

[0055] The thickness of each part of the cross section of the elastic fixing member 3 may be the same, and the elastic fixing member 3 may be integrally formed.

[0056] The elastic fixing member 3 may be made of insulating material or an insulating coating may be attached to the surface of the metal frame. The metal frame can make the insulating sleeve elastic and meet the requirements of strength and rigidity, and the insulating coating can make the elastic fixing member 3 non-conductive.

[0057] Adjacent elastic fixing members 3 in the same winding installation slot 11 may not contact each other in the radial direction R, so that there is a gap. The gap between the winding installation slot 11 and the wire 21 and the gap between adjacent wires 21 (or the gap between the conductor 21 and the elastic fixing member 3) can form a cooling oil channel, and the cooling oil channel penetrates the stator core 1 along the axial direction A. The oil passing through the cooling oil channel can flow from one axial end of the stator to the other axial end of the stator, and the oil can cool the stator core 1 and the winding 21.

[0058] It can be understood that, in another example, the oil can be supplied to the cooling oil channel from the axial middle position of the stator, and flows out of the cooling oil channel from the axial ends of the stator.

[0059] Optionally, the bottom (radially outer end) of the winding installation slot 11 may be provided with a groove 111, and the groove 111 allows a gap between the wire 21 near the bottom of the winding installation slot 11 and the winding installation slot 11, and the gap may also form a cooling oil channel. It can be understood that the groove 111 is not necessary, and except for the opening position of the winding installation slot 11, the wall of the winding installation slot 11 may be a plane without a convex or concave structure.

[0060] When the winding 2 and the elastic fixing member 3 are installed in the winding installation groove 11, the multiple wires 21 and the elastic fixing member 3 in one winding installation groove 11 can be first combined together and then inserted into the winding installation groove 11 along the axial direction. Then, a radial external force is applied to compress the multiple wires 21 and the elastic fixing member 3, and finally the isolation strip 12 is inserted. After the applied external force is released, the wires 21 are clamped and fixed. The elastic fixing member 3 has a simple structure, is easy to manufacture, and the assembly process of installing the winding 2 and the elastic fixing member 3 into the winding installation groove 11 is simple. Of course, the assembly method or steps of the stator in this embodiment are not limited to this.

[0061] The present application is not limited to the above embodiments, and those skilled in the art can make various modifications to the above embodiments of the present application under the guidance of the present application without departing from the scope of the present application. In addition, the following description is also made.

[0062] (1) In the above embodiment, the winding installation groove 11 is provided at the inner periphery of the stator core 1, but the present application is not limited thereto. In other possible embodiments, the winding installation groove may be provided at the outer periphery of the stator core 1. In other words, the motor of the present application may be an inner rotor motor or an outer rotor motor.

[0063] (2) In the above embodiment, the curved section 32 is located radially outside the waveform section 31, and the end section 33 is located radially inside the waveform section 31, but the present application is not limited to this. In other possible embodiments, the curved section may be located radially inside the waveform section, and the end section may be located radially outside the waveform section.

[0064] (3) In the above embodiment, the curved section 32 is elastic by bending to form a curved inner section 322 and a curved outer section 323, but the present application is not limited thereto. In other possible embodiments, the curved section may be formed into a wave shape or an arc shape.

[0065] The motor stator, motor and vehicle power system of the present application may have the following beneficial effects.

[0066] (1) A cooling oil passage penetrating the stator core 1 can be formed between two adjacent wires 21 by means of the elastic fixing member 3, and the oil passage does not need to be processed on the wires 21 or the winding mounting groove 11. It is easier to manufacture the elastic fixing member 3 than to process the concave-convex structure on the wires 21 or the winding mounting groove 11, so the manufacturing cost of the motor stator is lower.

[0067] (2) The winding can be clamped by the elastic fixing part 3, and the elastic fixing part 3 squeezes the wall of the winding mounting groove 11 to fix it. The winding and the elastic fixing part 3 will not move against each other, thereby protecting the winding from winding wear and improving the noise, vibration and acoustic roughness (NVH) problems.

[0068] (3) It is easy to manufacture standardized elastic fixing members 3 according to wires 21 of different specifications and sizes, which is suitable for mass production and helps to reduce costs.

[0069] It should be understood that at least some aspects or features of the above-mentioned implementation modes, embodiments or examples may be appropriately combined.

[0070] It is understood that in the present application, when the number of parts or components is not particularly limited, the number may be one or more, and the multiple here means two or more. For the case where the number of parts or components shown in the drawings and / or described in the specification is a specific number such as two, three, four, etc., the specific number is usually exemplary and not restrictive, and it can be understood as multiple, that is, two or more, but this does not mean that the present application excludes the case of one.

[0071] In the present application, unless otherwise clearly stated or limited, the terms such as "install", "assemble", "assemble", "connect", "connect", "couple", "link", "abut", "connect", "interconnect", "intercommunication", "conduction", "fixation", "fastening" and the like should be understood in a broad sense, for example, they can be direct or indirect. For example, regarding connection, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly stated or limited. For example, regarding connectivity / conduction, it can be direct connectivity / conduction, or it can be indirect connectivity / conduction via an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0072] In the present application, unless otherwise clearly stated or limited, a component disposed on / installed on / located on / accommodated on / placed in, within, inside, etc. another component may be any of the following two situations: a part or most of the one component is located in the other component; and the one component is completely accommodated in the other component.

[0073] Although the present application is described in detail using the above-mentioned embodiments, it is obvious to those skilled in the art that the present application is not limited to the embodiments described in this specification. The present application can be modified and implemented as a modified embodiment without departing from the subject matter and scope of the present application as determined by the claims. Therefore, the description in this specification is for the purpose of illustration and does not have any restrictive meaning for the present application.

Claims

1. A motor stator, characterized in that: include: A stator core, wherein the stator core is provided with a plurality of winding installation slots penetrating the stator core in an axial direction of the stator core; A winding, the winding being installed in the winding installation slot, the winding accommodated in each winding installation slot comprising a plurality of wires, the plurality of wires being arranged in the winding installation slot along the radial direction of the stator core; and an elastic fixing member, wherein the elastic fixing member extends along the axial direction of the stator core as a whole, and the winding is installed and positioned in the winding installation groove through the elastic fixing member, In the same winding installation groove, the elastic fixing part is arranged between two adjacent conductive wires, and the elastic fixing part includes a corrugated segment, and the cross-section of the corrugated segment is wavy or arc-shaped. The corrugated segment enables a gap in the radial direction between two adjacent conductive wires in the same winding installation groove, and the gap forms a cooling oil channel that penetrates the stator core along the axial direction.

2. The motor stator according to claim 1, characterized in that: The elastic fixing member further comprises two curved sections, the two curved sections are respectively connected to two ends of the wave-shaped section in the width direction, and the two curved sections clamp the wire. In a natural state before the elastic fixing piece is deformed by force, the width of the elastic fixing piece along the circumferential direction of the stator core is greater than the width of the winding mounting groove along the circumferential direction, and the elastic fixing piece is squeezed and deformed in the winding mounting groove, so that the elastic fixing piece is installed in the winding mounting groove.

3. The motor stator according to claim 2, characterized in that: The bending section includes a bending portion, a bending inner section and a bending outer section, the bending portion connects the bending inner section and the bending outer section, the bending inner section is in contact with the wire, the bending outer section is in contact with the side wall of the winding mounting groove, there is a gap between the bending inner section and the bending outer section, and the bending section enables the elastic fixing member to be elastically compressed along the circumferential direction.

4. The motor stator according to claim 3, characterized in that: The bending portion is in an arc shape, and can guide the wire to be inserted between the two bending segments from the opening between the two bending segments.

5. The motor stator according to claim 2, characterized in that: The elastic fixing member also includes two ends, which are respectively connected to the two curved segments, the curved segments and the ends are located on both sides of the wave-shaped segment in the radial direction of the stator core, and the two curved segments and the two ends clamp the two wires respectively.

6. The motor stator according to claim 5, characterized in that: The two end portions form a gradually expanding opening, and the end portion protrudes toward the inner side between the two end portions to form an arc shape.

7. The motor stator according to claim 1, characterized in that: The cross section of the wire is generally rectangular, and each side of the cross section of the wire is a straight line.

8. The motor stator according to claim 1, characterized in that: The winding is mounted on the stator core only through the elastic fixing member, and the axial ends of the winding are not fixed by colloid. In the axial direction of the motor stator, the length of the elastic fixing member is greater than the length of the stator core, and both axial ends of the elastic fixing member protrude from the axial end surface of the stator core.

9. A motor, characterized in that: A motor stator comprising any one of claims 1 to 8.

10. A vehicle power system, characterized in that: A motor stator comprising any one of claims 1 to 8.

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