Electric motor stator and assembly method therefor, and electric motor

Abstract

An electric motor stator, comprising: an iron core (1), which is provided with a plurality of slots (1c) spaced apart in a circumferential direction (C); and a winding (2), which is mounted on the iron core (1) and comprises extension portions (22) that extend towards both axial sides from each slot (1c). The electric motor stator further comprises limiting assemblies (3), wherein the limiting assemblies (3) are located on an axial end face of the iron core (1) and are fixed to the iron core (1); and each limiting assembly (3) encloses a limiting hole (3h), the inner peripheral wall of the limiting hole (3h) abutting against the extension portion (22) that passes through the limiting hole (3h), such that, by means of limitation of the limiting assemblies (3), at least some of the extension portions (22) are fixed relative to the iron core (1) in a radial direction (R) and the circumferential direction (C). In this way, a relatively simple mechanical structure is used to avoid possible wire movement in the radial direction and circumferential direction of the electric motor stator. Further provided are an assembly method for the electric motor stator, and an electric motor which comprises the electric motor stator.

Description

Motor stator, assembly method thereof, and motor Technical Field

[0001] The present application relates to the field of motors, and in particular to a motor stator and an assembly method thereof, as well as a motor including the motor stator. Background Art

[0002] In the electric drive system of existing vehicles, an electric motor is used to drive the vehicle. In the motor stator of the motor, a wire (such as a flat copper wire) is installed on the iron core and forms a predetermined electrical circuit, thereby forming a winding; in addition, insulating paper is arranged in the slot of the iron core to improve the insulation properties between the various components of the motor stator. In order to smoothly install the wire and arrange the insulating paper, it is necessary to leave a gap between the wire and the insulating paper, and between the insulating paper and the slot wall of the iron core. In this case, after the motor stator is installed in place, due to the action of electromagnetic force or other external forces, the wire may move relative to the iron core in the radial and circumferential directions of the motor, thereby causing the NVH performance to deteriorate and the wire may produce unexpected wear.

[0003] To prevent this type of wire movement, conventional technology involves injecting adhesive into the core slots after the wires and insulation paper are installed. However, this technology faces significant challenges in slot-cooled motors. Because the adhesive is highly fluid before curing, it can flow into the cooling channels formed within the core slots, potentially blocking them.

[0004] Summary of the Invention

[0005] This application is made in light of the technical problems existing in the above-mentioned prior art. One object of this application is to provide a motor stator and an assembly method thereof, which can prevent the cooling channels within the iron core slots from being blocked by injected adhesive while also preventing the conductors from moving radially and circumferentially within the motor stator. Another object of this application is to provide a motor including the above-mentioned motor stator.

[0006] In order to achieve the above objectives, the present application may adopt the following technical solutions.

[0007] The present application provides a motor stator having axial, radial and circumferential directions, and comprising:

[0008] an iron core formed with a plurality of slots spaced apart in the circumferential direction; and

[0009] A winding is mounted on the core, the winding including a protruding portion extending from each slot toward both axial sides,

[0010] The motor stator also includes a limiting assembly, which is located on the axial end face of the iron core and is fixed to the iron core. The limiting assembly surrounds and forms a limiting hole, and the inner circumferential wall of the limiting hole abuts against the protruding portion passing through the limiting hole, thereby at least a portion of the protruding portion is fixed relative to the iron core in the radial and circumferential directions by the limiting assembly.

[0011] In an optional solution, the limiting assembly includes a first ring, a plurality of wedge-shaped members and a second ring, wherein the first ring and the plurality of wedge-shaped members surround and define the limiting hole, a portion of the wedge-shaped member extends between adjacent protruding portions, the first ring and the second ring are respectively located on both radial sides of the protruding portions, and the second ring squeezes the wedge-shaped member toward the first ring.

[0012] In another optional solution, the first ring abuts against the protruding portion from the radial inside, and

[0013] Each of the wedge-shaped pieces includes an insertion portion and a limiting portion fixed to each other, the insertion portion includes a first end, a second end, and a central portion located between the first end and the second end, the first end is inserted into the first ring, the two limiting portions extend from the second end toward both sides of the circumference and abut against the protruding portions from the radial outside, and the central portion is located between the two protruding portions adjacent to each other in the circumferential direction and abuts against the two protruding portions.

[0014] In another optional solution, the first ring abuts against the protruding portion from the radial outside, and

[0015] Each of the wedge-shaped pieces includes an insertion portion and a limiting portion fixed to each other, the insertion portion includes a first end, a second end, and a central portion located between the first end and the second end, the first end is inserted into the first ring, the two limiting portions extend from the second end toward both circumferential sides and abut against the protruding portions from the radial inner side, and the central portion is located between two adjacent protruding portions and abuts against the two protruding portions.

[0016] In another optional solution, the first ring is formed with a plurality of grooves, and the first end portion is inserted into the corresponding grooves to limit the first ring in the axial direction and the circumferential direction.

[0017] In another optional scheme, the first ring includes a main body portion and a plurality of protrusions fixed to each other, the main body portion extends continuously along the entire circumference, the main body portion abuts the iron core and the protruding portion, and the plurality of protrusions protrude from the main body portion in a direction away from the iron core, so that the groove is defined between the protrusions adjacent in the circumferential direction.

[0018] In another optional solution, the first end portion and the central portion form a step structure, and the main body portion and the central portion are always spaced apart in the radial direction.

[0019] In another optional solution, the device further includes insulating paper, wherein the first ring and the wedge-shaped member abut against the protruding portion via the insulating paper.

[0020] The radial end of the wedge-shaped member away from the first ring is located between the second ring and the core in the axial direction.

[0021] The second ring presses the wedge toward the first ring via an inclined surface.

[0022] The present application also provides a method for assembling a motor stator according to any one of the above technical solutions, characterized in that the assembly method includes:

[0023] a first ring assembling step, wherein the first ring is moved in the axial direction to a position abutting against the axial end surface of the core so that the first ring abuts against the protruding portion in the radial direction;

[0024] a wedge member assembling step, wherein each of the wedge members is inserted between the protruding portions along a different radial direction; and

[0025] A second ring assembling step includes moving the second ring along the axial direction to a position abutting against the axial end surface, and during the movement of the second ring, the second ring causes the wedge to move toward the first ring.

[0026] The present application also provides a motor, comprising the motor stator described in any one of the above technical solutions.

[0027] By adopting the above-mentioned technical solution, the present application provides a motor stator. The motor stator of the present application includes an assembled iron core, a winding, and a retaining assembly. The iron core is formed with a plurality of slots spaced apart in the circumferential direction. The winding is mounted on the iron core and includes protrusions extending axially from each slot. The protrusions extending from different slots are electrically connected in a predetermined pattern, thereby forming a predetermined electrical circuit for the winding. The retaining assembly is located on an axial end face of the iron core and is fixed to the iron core. The retaining assembly surrounds and forms a retaining hole. The inner circumferential wall of each retaining hole abuts against the protrusion extending through the retaining hole in the radial and circumferential directions. As a result, at least some of the protrusions are radially and circumferentially fixed relative to the iron core by the retaining assembly. In this way, the retaining holes of the retaining assembly are used to prevent the conductors from moving radially and circumferentially in the motor stator with a relatively simple mechanical structure. Moreover, since no adhesive is injected into the iron core slots, the cooling flow path within the iron core slots is prevented from being blocked by the injected adhesive. A motor comprising the motor stator is also provided, and the motor has the same effect.

[0028] The present application also provides a method for assembling a motor stator. The method includes a first ring assembly step, a wedge assembly step, and a second ring assembly step, performed sequentially. In the first ring assembly step, the first ring is moved axially into a position abutting the axial end face of the core, radially abutting the protruding portion of the winding. In the wedge assembly step, each wedge is inserted along a different radial direction between the protruding portions. In the second ring assembly step, the second ring is moved axially into a position abutting the axial end face. During the axial movement of the second ring, the second ring moves the wedge toward the first ring. This makes the assembly method easy to implement and does not affect the installation of the windings on the core. In other words, the assembly of the stopper assembly of the present application does not affect the process of inserting the windings into the core, twisting them, and electrically connecting them. Instead, the stopper assembly can be assembled after the windings are already assembled and form the predetermined electrical circuit. Of course, the assembly timing of the stopper assembly is not limited to this; for example, the stopper assembly can be installed before the windings are fully formed. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] FIG1A is a perspective schematic diagram showing a stator of a motor according to an embodiment of the present application.

[0030] FIG. 1B is another schematic perspective view showing the stator of the motor in FIG. 1A .

[0031] FIG. 1C is a schematic diagram illustrating an exploded structure of the motor stator in FIG. 1A .

[0032] FIG. 1D is a schematic front view showing the stator of the motor in FIG. 1A .

[0033] FIG. 1E is a schematic cross-sectional view of the motor stator in FIG. 1A taken along the axial direction and one radial direction, in which hatching is omitted.

[0034] 1F , 1G and 1H are schematic cross-sectional perspective views showing different partial structures of the motor stator in FIG. 1A , in which hatching is omitted.

[0035] FIG. 2 is a perspective schematic diagram showing a first ring of a limiting assembly of the motor stator in FIG. 1A .

[0036] 3A and 3B are perspective schematic views showing a wedge-shaped member of a limiting assembly of the motor stator in FIG. 1A .

[0037] 4A and 4B are perspective schematic views showing a second ring of the limiting assembly of the motor stator in FIG. 1A .

[0038] 5A to 5F are schematic diagrams for explaining a method of assembling the motor stator in FIG. 1A .

[0039] Description of Reference Numerals

[0040] 1 iron core; 1c slot; 1p cooling flow path;

[0041] 2 winding; 21 slot part; 22 protruding part;

[0042] 3 limit components; 3h limit holes;

[0043] 31 first ring; 31c groove; 311 main body; 312 raised portion;

[0044] 32 wedge-shaped member; 32s driven surface; 321 insertion portion; 3211 first end portion; 3212 second end portion; 3213 central portion; 322 limiting portion;

[0045] 33 second ring; 33s driving surface; 331 annular body portion; 332 lug portion;

[0046] 4. Insulation paper;

[0047] 5. Connectors;

[0048] A is axial; R is radial; C is circumferential. DETAILED DESCRIPTION

[0049] The specific embodiments of the present application will be described in detail below in conjunction with the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, and are not intended to exhaust all possible methods of the present application, nor to limit the scope of the present application.

[0050] In this application, unless otherwise specified, "axial," "radial," and "circumferential" refer to the axial, radial, and circumferential directions of the motor stator (iron core), respectively. Furthermore, "one axial side" refers to, for example, the right side in Figures 1E and 1G , and "the other axial side" refers to, for example, the left side in Figures 1E and 1G .

[0051] In this application, an "extending portion" refers to the portion of all conductors (such as flat copper wires) in a slot of the iron core where the winding extends outward from the iron core toward either axial side, and each extending portion corresponds to only one slot of the iron core. The connection parts of different extending portions can be considered to be located at the axial ends of the winding.

[0052] The motor stator according to the present application is described below with reference to the accompanying drawings.

[0053] As shown in FIG. 1A to FIG. 1H , a motor stator according to an embodiment of the present application includes an iron core 1 , a winding 2 , a limiting assembly 3 , insulating paper 4 , and a connector 5 that are assembled together.

[0054] In this embodiment, as shown in Figures 1A to 1H, the core 1 has a generally cylindrical shape. The core 1 may be a laminate formed by stacking silicon steel sheets in the axial direction A. The core 1 includes a yoke and a plurality of teeth. The yoke extends continuously along the entire circumference in the circumferential direction C. The plurality of teeth extend radially inward from the yoke and are spaced apart in the circumferential direction C, such that the plurality of teeth define a plurality of slots 1c evenly spaced apart in the circumferential direction C. The slots 1c have a rectangular cross-sectional shape, and each slot 1c is open outward at both axial ends, with the radially outer end of the slot 1c closed and the radially inner end open. In addition, the outer circumferential surface of the yoke of the core 1 is formed with a plurality of ribs, each of which extends linearly along the axial direction A and extends the entire axial length of the core 1, and each rib is formed with a connecting hole extending through the axial direction A.

[0055] In this embodiment, as shown in Figures 1A to 1H , the winding 2 is a hairpin-style winding comprised of multiple hairpin units. Each hairpin unit can be formed by bending a single wire conductor, such as a flat copper wire having a rectangular (or substantially rectangular) cross-section. When the winding 2 is mounted on the core 1, the winding 2 includes an in-slot portion 21 inserted into a slot 1c of the core 1 and a protruding portion 22 extending axially from each slot 1c of the core 1. The protruding portions 22 extending from different slots 1c can be electrically connected by twisting and then welding, thereby forming a predetermined electrical circuit for the winding 2. Furthermore, as shown in Figures 1E to 1H , the in-slot portion 21 of the flat copper wire in each slot 1c is arranged in layers in the radial direction R, and the protruding portions 22 are also arranged in layers in the radial direction R.

[0056] In this embodiment, as shown in Figures 1A to 1H, two limiting assemblies 3 are respectively located on the two axial end surfaces of the core 1 and are fixed to the core 1. The components in each limiting assembly 3 can be made of insulating material, and each limiting assembly 3 is surrounded by a plurality of limiting holes 3h. The inner circumferential wall of each limiting hole 3h abuts against the protruding portion 22 passing through the limiting hole 3h in the radial direction R and the circumferential direction C, thereby all the protruding portions 22 are fixed relative to the core 1 in the radial direction R and the circumferential direction C by the limiting assembly 3. The limiting assembly 3 located on one axial side limits the protruding portion 22 of the winding 2 located on one axial side, and the limiting assembly 3 located on the other axial side limits the protruding portion 22 of the winding 2 located on the other axial side. Specifically, as shown in Figure 1C, each limiting assembly 3 includes a first ring 31, a plurality of wedges 32, and a second ring 33 assembled together. The first ring 31 and the plurality of wedges 32 surround and define the plurality of limiting holes 3h.

[0057] As shown in FIG1D , when the first ring 31 is installed in place, the inner circumferential surface of the first ring 31 is substantially flush with the radial inner end surface of the tooth portion of the core 1, and the outer circumferential surface of the first ring 31 abuts the radially innermost flat copper wire of each protruding portion 22 of the winding 2. Furthermore, as shown in FIG2 , the first ring 31 includes a main body portion 311 and a plurality of protrusions 312 formed as one body. The main body portion 311 extends continuously along the entire circumference along the circumferential direction C. The main body portion 311 abuts the axial end surface of the core 1 (the axial end surface of the tooth portion of the core 1), and the main body portion 311 is located radially inward of the protruding portion 22 of the winding 2 and abuts all the protruding portions 22, thereby achieving an interference fit between the first ring 31 and all the protruding portions 22. Multiple protrusions 312 protrude from the main body 311 in a direction away from the iron core 1, that is, the multiple protrusions 312 of the first ring 31 located on one axial side of the iron core 1 protrude toward one axial side relative to the main body 311, and the multiple protrusions 312 of the first ring 31 located on the other axial side of the iron core 1 protrude toward the other axial side relative to the main body 311, so that a groove 31c is defined between adjacent protrusions 312 in the circumferential direction C.

[0058] As shown in Figures 3A and 3B, each wedge member 32 has a T-shaped structure and includes an integral insertion portion 321 and a stopper portion 322. The insertion portion 321 includes a first end 3211, a second end 3212, and a central portion 3213 located between the first and second ends 3211 and 3212. In this embodiment, the first end 3211 of the insertion portion 321 is the radially inner end of the insertion portion 321 and is inserted into the groove 31c of the first ring 31. The second end 3212 of the insertion portion 321 is the radially outer end of the insertion portion 321. Two stoppers 322 extend circumferentially from the second end 3212. The radially inner end surfaces of the two stoppers 322 abut against the radially outermost rectangular copper wires of the protruding portion 22 of the core from the radially outer side. The central portion 3213 is located between two adjacent protruding portions 22 in the circumferential direction C and abuts against them. Furthermore, when installed in place, the limiting portions 322 of two adjacent wedge members 32 in the circumferential direction C can contact each other or have only a very small gap therebetween, thereby forming the aforementioned limiting hole 3h surrounded by the protruding portion 312 of the first ring 31, the central portion 3213 of the insertion portion 321 of the two adjacent wedge members 32 in the circumferential direction C, and the limiting portions 322 of the two wedge members 32. Furthermore, the first end portion 3211 and the central portion 3213 form a stepped structure, with the main portion 311 and the central portion 3213 always spaced apart in the radial direction R. Therefore, in the second ring assembly step of the assembly method described below, the wedge member 32 can be pushed radially inward by the second ring 33, and during this process, the main portion 311 and the central portion 3213 do not hinder the movement of the wedge member 32.

[0059] As shown in Figures 4A and 4B, the second ring 33 includes an integrally formed annular body portion 331 and a lug portion 332. The annular body portion 331 extends continuously along the entire circumference in the circumferential direction C. A plurality of lug portions 332 protrude radially outward from the annular body portion 331. These lug portions 332 are arranged at intervals in the circumferential direction C, and each lug portion 332 is formed with a connecting hole extending therethrough in the axial direction A.

[0060] 1G and 1H , the radial end of the wedge 32 away from the first ring 31 is located between the second ring 33 and the core 1 in the axial direction A. That is, in this embodiment, the radially outer end of the wedge 32 is located between the second ring 33 and the core 1 in the axial direction A. As shown in Figures 3A and 3B, the end face of the wedge 32 at the radial outer end is formed with a driven surface 32s inclined relative to the axial direction A and the radial direction R, and the driven surface 32s is also formed as an arc surface extending along the circumferential direction C. The inner circumference of the annular main body 331 of the second ring 33 is formed with a driving surface 33s that matches the shape of the driven surface 32s, so that in the process of the second ring 33 moving along the axial direction A to the axial end face of the iron core 1, the second ring 33 causes the wedge 32 to move toward the first ring 31 through the driving surface 33s and the driven surface 32s that abut against each other until the limiting portion 322 abuts against the protruding portion 22 and the limiting portion 322 and the first ring 31 clamp the protruding portion 22 in the radial direction R.

[0061] In this embodiment, as shown in Figures 1G and 1H, the insulating paper 4 is substantially located within the slot 1c of the core 1 and between the slot portion 21 of the winding 2 and the core 1, thereby improving the insulation performance of the motor stator. Furthermore, the insulating paper 4 extends axially from the slot 1c of the core 1, thereby allowing the first ring 31 and the wedge 32 to abut against the protruding portion 22 of the winding 2 through the insulating paper 4. Alternatively, the first ring 31 and the wedge 32 abut against the protruding portion 22 of the winding 2 via the insulating paper 4. In the axial direction A, the insulating paper 4 may, but is not limited to, slightly protrude axially from the stop assembly 3 or the stop hole 3h.

[0062] It can be understood that in the present application, the inner circumferential wall of the limiting component 3 or the limiting hole 3h abuts against the protruding part 22 in the following situations: the inner circumferential wall of the limiting component 3 or the limiting hole 3h abuts against the protruding part 22 directly and indirectly (for example, via the insulating paper 4).

[0063] In this embodiment, as shown in Figures 1A to 1F, a plurality of connectors 5 secure the limiting assemblies 3 located on both axial sides of the iron core 1 to the iron core 1. Each connector 5 passes through the connection holes of the second rings 33 of the two limiting assemblies 3 and the corresponding connection holes of the iron core 1, so that the connectors 5 can be threadedly engaged with nuts (not shown in the figures) to secure the limiting assemblies 3 to the iron core 1, thereby securing the iron core 1 to the two limiting assemblies 3.

[0064] The following describes a method for assembling a motor stator according to an embodiment of the present application.

[0065] In this assembly method, a first ring assembly step, a wedge assembly step, and a second ring assembly step may be included, which are performed in sequence. Specifically, after the insulating paper 4 and the winding 2 are installed in place, an intermediate body as shown in FIG5A is assembled. Further, in the first ring assembly step, as shown in FIG5B , the first ring 31 is moved along the axial direction A to a position abutting against the axial end face of the core 1, the first ring 31 abuts (or at least abuts after the protruding portion 22 is radially squeezed by the wedge 32) the protruding portion 22, and the first ring 31 achieves an interference fit with all the protruding portions 22. Thereafter, in the wedge assembly step, as shown in FIG5C , each wedge 32 is inserted between different protruding portions 22 along different radial directions R, so that each wedge 32 is located between the corresponding two protruding portions 22, but the radial inner end of the wedge 32 may not be inserted into or partially inserted into the groove 31c of the first ring 31. Then, as shown in FIG5D , in the second ring assembly step, the second ring 33 is moved along the axial direction A to a position abutting the axial end face of the core 1. During the movement of the second ring 33, via the abutting driving surface 33s and the driven surface 32s, the second ring 33 causes the wedge 32 to move toward the first ring 31 and press the outer circumferential surface of the protruding portion 22. At least at this time, the radially inner end of the wedge 32 is inserted into the groove 31c of the first ring 31. Ultimately, the stopper 322 of the wedge 32 and the first ring 31 clamp the protruding portion 22 of the winding 2 in the radial direction R, and the protruding portion 22 is clamped by the wedges 32 on both sides in the circumferential direction C, and the second ring 33 abuts the axial end face of the core 1 (see FIG5E ). Furthermore, the assembly of the stopper assembly 3 on the other axial side can be completed according to the same steps as above. FIG5F shows the intermediate body with the two stopper assemblies 3 installed in place. Furthermore, as shown in FIG5F , in order to move the second ring 33 of the stopper assembly 3 along the axial direction A toward the axial end face of the iron core 1, each connector 5 can be passed through the connection holes of the second ring 33 of the stopper assembly 3 on both sides and the connection holes of the iron core 1. The above-mentioned movement of the second ring 33 can be achieved by the connector 5 cooperating with a nut (not shown). Ultimately, these connectors 5 are used to secure the iron core 1 and the two stopper assemblies 3 together.

[0066] It should be understood that the above embodiments are merely illustrative and are not intended to limit the present application. Those skilled in the art may, based on the teachings of this application, make various modifications and alterations to the above embodiments without departing from the scope of this application. The following is a supplementary explanation of the technical solution of this application.

[0067] i. This application also provides a motor including the aforementioned motor stator, which exhibits all the technical effects of the motor stator described herein. The aforementioned motor stator or motor can typically be applied to an electric bridge drive system or a hybrid powertrain system, which may include an assembled motor and a transmission.

[0068] ii. In the above embodiments, the motor stator is a motor stator using a hairpin winding, but the present application is not limited thereto. For example, the motor stator of the present application may also be a motor stator using a wave winding.

[0069] iii. In the above embodiment, all protruding portions 22 of the winding 2 are restrained by the restraining holes 3h of the restraining assembly 3 formed by the first ring 31, the second ring 33, and the wedge 32, but the present application is not limited thereto. For example, in an alternative embodiment, only a portion of the protruding portions 22 are restrained by the restraining assembly 3 to be fixed relative to the core 1 in the radial direction R and the circumferential direction C. In this embodiment, a hairpin winding's hairpin unit, after being inserted into different slots 1c of the core 1, will correspond to multiple protruding portions 22. Thus, the restraining assembly 3 on one axial side can restrain one of the multiple protruding portions 22 corresponding to the same hairpin unit. In this way, the other protruding portions 22 corresponding to the hairpin unit do not need to be restrained by the restraining assembly 3. Thus, only a portion of the protruding portions 22 are restrained relative to the core 1 in the radial direction R and the circumferential direction C by the restraining assembly 3. In one example, the number of wedges can be less than the number of teeth on the core.

[0070] iv. In the above embodiment, the first end 3211 of the wedge 32 is inserted into the groove 31c of the first ring 31 to form a clearance fit with the first ring 31. However, the present application is not limited to this embodiment. To improve the structural stability of the stop assembly 3, the first end 3211 may have an interference fit with the first ring 31. It will be understood that regardless of the assembly method used for the first end 3211 and the first ring 31, all wedges 32 can prevent relative movement of the first ring 31 in the axial direction A and the circumferential direction C. Furthermore, the groove 31c may be a through-hole extending in the radial direction R.

[0071] In addition, in order to further position the wedge 32 and the first ring 31 on the shaft A, the motor stator may also include an oil ring that cooperates with the iron core 1. The oil ring can surround the iron core 1 to form an annular oil chamber while abutting against the wedge 32 and the first ring 31 from the axial direction A.

[0072] v. The scheme in the above embodiment is applicable to a motor with an outer stator and inner rotor layout, but the present application is not limited to this. The scheme of the present application can also be applied to a motor with an outer rotor and inner stator layout. To this end, in an optional scheme, the radial outer end of the slot of the iron core is open and the radial inner end is closed. Further, the first ring abuts against the protruding portion from the radial outer side. Each wedge-shaped member includes an insert and a limiting portion, the insert including a first end, a second end, and a central portion located between the first end and the second end, the first end being fixed to the first ring, the two limiting portions extending from the second end toward both circumferential sides and abutting against the protruding portion from the radial inner side, and the central portion being located between two adjacent protruding portions and abutting against the two protruding portions. In the above optional scheme, the first end is the radial outer end of the wedge-shaped member, and the second end is the radial inner end of the wedge-shaped member. Moreover, the radial inner end of the wedge-shaped member away from the first ring is axially located between the second ring and the iron core.

[0073] vi. In the technical solution of the present application, as shown in FIG1F , grooves extending along the axial direction A can be machined on the surface of each conductor to form a cooling flow path 1p for cooling fluid to flow within the groove 1c and between adjacent conductors and between the conductors and the insulating paper.

[0074] Here, the motor stator of the present application is preferably, but not necessarily, a slot-cooled stator. The slot-cooled stator here refers to a stator in which the cooling fluid flows through the slots 1c of the iron core that accommodate the conductors, such as the above-mentioned cooling flow path 1p, and can directly cool the conductors.

[0075] vii. In the technical solution of the present application, the use of a relatively simple structure and easy-to-assemble limit assembly 3 can prevent the winding 2 from moving relative to the core 1 in the radial direction R and the circumferential direction C, and also avoids the situation in the prior art where the adhesive is injected into the slot 1c of the core 1, resulting in the cooling flow path 1p being blocked. In addition, the assembly process of the limit assembly 3 of the present application will not affect the insertion, twisting and welding process of the winding 2 of the motor stator, but the limit assembly 3 can be assembled after the winding 2 has been assembled in place and a predetermined electrical circuit has been formed. Therefore, the assembly process of the limit assembly 3 of the present application will not have an adverse effect on the structure, size and assembly process of the existing motor stator, and also enables the solution of the present application to be applied to motor stators of different types and structures.

Claims

1. A motor stator having an axial direction (A), a radial direction (R), and a circumferential direction (C), and comprising: A core (1) formed with a plurality of slots (1c) spaced apart in the circumferential direction (C); And A winding (2) mounted on the core (1), the winding (2) including extending portions (22) extending from each of the slots (1c) towards both axial sides, Characterized in that the motor stator further comprises a limiting assembly (3), the limiting assembly (3) is located at the axial end face of the core (1) and is fixed to the core (1), the limiting assembly (3) encloses and forms a limiting hole (3h), and the inner peripheral wall of the limiting hole (3h) abuts against the extending portion (22) passing through the limiting hole (3h), whereby at least a part of the extending portion (22) is fixed relative to the core (1) in the radial direction (R) and the circumferential direction (C) by the limitation of the limiting assembly (3).

2. The motor stator according to claim 1, wherein The limiting assembly (3) includes a first ring (31), a plurality of wedges (32), and a second ring (33), the first ring (31) and the plurality of wedges (32) enclose and define the limiting hole (3h), a part of the wedge (32) extends between adjacent extending portions (22), the first ring (31) and the second ring (32) are respectively located on the radial two sides of the extending portion (22), and the second ring (32) presses the wedge (32) towards the first ring.

3. The motor stator according to claim 2, wherein, The first ring (31) abuts against the extending portion (22) from the radial inner side, and Each wedge (32) includes an insertion portion (321) and a limiting portion (322) fixed to each other, the insertion portion (321) includes a first end (3211), a second end (3212), and a central portion (3213) located between the first end (3211) and the second end (3212), the first end (3211) is inserted into the first ring (31), two limiting portions (322) extend from the second end (3212) towards both circumferential sides and abut against the extending portion (22) from the radial outer side, and the central portion (3213) is located between two adjacent extending portions (22) in the circumferential direction (C) and abuts against these two extending portions (22).

4. The motor stator according to claim 2, wherein, The first ring abuts against the extending portion from the radial outer side, and Each wedge includes an insertion portion and a limiting portion fixed to each other, the insertion portion includes a first end, a second end, and a central portion located between the first end and the second end, the first end is inserted into the first ring, two limiting portions extend from the second end towards both circumferential sides and abut against the extending portion from the radial inner side, and the central portion is located between adjacent extending portions and abuts against these two extending portions.

5. The motor stator according to claim 3 or 4, characterized in that, The first ring (31) is formed with a plurality of grooves (31c), and the first end (3211) is inserted into the corresponding groove (31c) to limit the first ring (31) in the axial direction (A) and the circumferential direction (C).

6. The stator of an electric machine according to claim 5, characterized in that, The first ring (31) includes a main body portion (311) and a plurality of protruding portions (312) fixed to each other. The main body portion (311) extends continuously in the circumferential direction (C) over the entire circumference. The main body portion (311) abuts against the iron core (1) and the protruding portion (22). The plurality of protruding portions (312) protrude from the main body portion (311) in a direction away from the iron core (1), such that the groove (31c) is defined between the adjacent protruding portions (312) in the circumferential direction (C).

7. The stator of an electric machine according to claim 6, characterized in that, The first end portion (3211) and the central portion (3213) form a stepped structure, and there is always a gap between the main body portion (311) and the central portion (3213) in the radial direction (R).

8. The motor stator according to any one of claims 2 to 4, characterized in that, It further includes insulating paper (4). The first ring (31) and the wedge member (32) abut against the protruding portion (22) with the insulating paper (4) therebetween. The radial end portion of the wedge member (32) away from the first ring (31) is located between the second ring (33) and the iron core (1) in the axial direction (A). The second ring presses the wedge member (32) toward the first ring through an inclined surface.

9. A method for assembling a motor stator according to any one of claims 2 to 8, characterized in that, The assembly method includes: A first ring assembly step, in which the first ring (31) is moved along the axial direction (A) to a position abutting against the axial end surface of the iron core (1), such that the first ring (31) abuts against the protruding portion (22) in the radial direction (R); A wedge member assembly step, in which each wedge member (32) is inserted between the protruding portions (22) along different radial directions (R); and A second ring assembly step, in which the second ring (33) is moved along the axial direction (A) to a position abutting against the axial end surface. During the movement of the second ring (33), the second ring (33) causes the wedge member (32) to move toward the first ring (31).

10. A motor, characterized in that, It includes a motor stator according to any one of claims 1 to 8.

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