Spliced stator and motor

Abstract

The utility model discloses a spliced stator and a motor. The spliced stator comprises a stator core and a winding, the stator core comprises an annular stator yoke part and a stator tooth part concentrically arranged on the inner circumference of the stator yoke part, and an accommodating space is formed in a stator groove; the winding comprises a plurality of conductors, each conductor comprises two parallel plugging ends, the first ends of the two plugging ends are connected through a connecting end, the second ends of the two plugging ends are respectively bent to form two pins, and the two plugging ends are respectively arranged in the accommodating spaces of different stator slots in a penetrating manner along the axial direction; and the connecting ends and the pins respectively extend to the exteriors of the two ends of the accommodating space. According to the scheme, the defects that a conventional wave winding line type is too hard in hardness and the wave winding is difficult to enter a groove are overcome, higher groove fullness rate and copper fullness rate under the same size are achieved, higher and more performance output is guaranteed, and then the high torque power density ratio, high consistency and high efficiency are achieved.

Description

Technical Field

[0001] The utility model relates to the field of motors, and in particular to a spliced ​​stator and a motor. Background Art

[0002] In the electric drive motors currently used in the new energy vehicle industry, the common stator structure is a tooth-yoke integrated structure, in which the stator teeth are typically configured in a T-shaped structure, thereby forming a limit structure outside the stator slots. For example, the utility model patent with authorization announcement number CN206977169U provides a 54-slot stator core for electric vehicle motors, comprising a plurality of stacked annular stator punchings, with 54 slots evenly spaced on the inner ring of the annular stator punchings. The teeth formed between any two adjacent slots are generally T-shaped. This motor stator has the characteristics of being compact and material-saving. However, due to the T-shaped structure of its teeth, it forms a limit at the slot opening, so the winding can only pass through the stator slot axially, making the winding process more complicated. In addition, in the prior art, the stator slots are basically parallel slot structures, that is, the cross-section of the stator slots is generally rectangular. In order to ensure the tooth thickness between the stator slots, the cross-sectional area of ​​the stator slots for accommodating the windings is limited, and therefore the slot fill rate that can be achieved is also limited. Utility Model Content

[0003] Therefore, in order to solve the above problems, the present invention provides a spliced ​​stator and motor.

[0004] The utility model is realized through the following technical solutions:

[0005] A spliced ​​stator comprises: a stator core and a winding, wherein the stator core comprises an annular stator yoke and a stator tooth portion concentrically arranged on the inner periphery of the stator yoke, wherein the stator tooth portion comprises a gear ring and stator teeth arranged at equal angles on the outer periphery of the gear ring, wherein each stator tooth on the outer periphery of the gear ring is a rectangular stator tooth of the same shape, so that the gap between two adjacent stator teeth forms a trapezoidal stator slot that gradually expands from the inside to the outside, the outer ends of the stator slots are open, and the inner periphery of the stator yoke is provided with limiting slots of the same number and shape as the stator teeth, and the outer ends of the stator teeth are all embedded in their corresponding In the limiting groove, a limiting block matching the opening at the outer end of the stator slot is formed between two adjacent limiting grooves, and the limiting blocks are all embedded in the opening of the stator slot corresponding to them, and an accommodating space is formed between each limiting block and the stator slot corresponding to it; the winding includes a plurality of conductors, and the conductor includes two plug-in ends arranged in parallel, the first ends of the two plug-in ends are connected by a connecting end, and the second ends of the two plug-in ends are each bent to form two pins, and the two plug-in ends are respectively axially arranged in the accommodating spaces of different stator slots, and the connecting end and the pins respectively extend to the outside of the two ends of the accommodating space.

[0006] Preferably, each conductor includes a first plug-in end and a second plug-in end, the first plug-in end is close to the inner end of the stator slot, and the second plug-in end is close to the outer end of the stator slot. The cross-sections of the first plug-in end and the second plug-in end are both trapezoidal, and the long side width of the cross-section of the first plug-in end is less than or equal to the short side width of the second plug-in end.

[0007] Preferably, the plug-in ends of the conductors are formed by integrally punching a plurality of trapezoidal copper foil sheets.

[0008] Preferably, the accommodation space of each stator slot is provided with 2-4 layers of plug-in parts in sequence from the inside to the outside.

[0009] Preferably, the stator teeth are formed by stacking and punching multiple layers of first silicon steel sheets of the same shape, and the stator yoke is formed by stacking and punching multiple layers of second silicon steel sheets of the same shape.

[0010] Preferably, an insulating member is further provided between the plug-in end of the conductor and the inner wall of the accommodating space, and both ends of the insulating member extend to the outside of both ends of the accommodating space.

[0011] Preferably, a plurality of cooling through holes are distributed at equal angles along the circumferential direction on the stator yoke, and the cooling through holes are arranged along the axial direction of the stator yoke.

[0012] Preferably, a magnetic isolation groove is provided at the inner end of each stator slot on the gear ring, the magnetic isolation groove is arranged along the radial direction of the gear ring, and the width of the magnetic isolation groove is smaller than the width of the inner end of the stator slot.

[0013] A motor comprising any of the above-described spliced ​​stators.

[0014] The beneficial effects of the technical solution of this utility model are mainly reflected in:

[0015] 1. The stator core adopts a separate stator tooth and yoke structure, and the tooth slot is set as a trapezoidal slot structure. On the one hand, the separated tooth and yoke structure combined with the structural design of the stator slot that is narrow inside and wide outside facilitates the pressing of the excitation line wave winding from the outer end of the stator slot. Subsequently, the stator yoke is installed on the outer periphery of the stator tooth, which solves the shortcomings of conventional wave winding line hardness and difficulty in slot insertion. On the other hand, the trapezoidal slot design achieves higher slot fill rate and copper fill rate under the same size, ensuring higher and more performance output, thereby achieving a high torque power density ratio, high consistency, and high efficiency.

[0016] 2. The stator yoke is provided with limit slots that match the stator teeth. At the same time, the limit blocks between the limit slots match the tooth slots between the stator teeth, so that the stator yoke and the stator teeth are plugged into each other to achieve assembly. While solving the process solution for external press-fit winding, it can save additional link welding or rivet structure, and realize rapid assembly while ensuring reliability and strength, thereby improving processing efficiency and reducing process costs.

[0017] 3. In a preferred embodiment, the conductor's plug-in ends are integrally stamped from a plurality of trapezoidal copper foil sheets. The shape of the copper foil sheets can be adjusted to match the plug-in ends with the stator slot's accommodation space. This allows more conductors to be inserted into the stator with the same inner and outer diameters, thereby maximizing the stator slot fill rate and thereby improving the stator's output performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a top view of the stator core;

[0019] Figure 2 yes Figure 1 Enlarged view of part A;

[0020] Figure 3 is a top view of the stator yoke;

[0021] Figure 4 is a top view of the stator teeth;

[0022] Figure 5 This is a schematic diagram of the connection between two adjacent conductors and the stator core when two layers of winding are set;

[0023] Figure 6 It is a structural diagram of a spliced ​​stator;

[0024] Figure 7 It is a schematic diagram of the structure of the conductor;

[0025] Figure 8 It is a schematic diagram of the local structure of copper foil stacking and stamping. DETAILED DESCRIPTION

[0026] To more clearly and in detail illustrate the objectives, advantages, and features of the present invention, the following non-limiting description of preferred embodiments is provided for illustration and explanation. This embodiment is merely a typical example of the application of the present invention's technical solution. Any technical solution formed by equivalent substitution or equivalent transformation falls within the scope of protection claimed by the present invention.

[0027] It is also stated that in the description of the scheme, it should be noted that the terms "center", "up", "down", "left", "right", "front", "back", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] Furthermore, the terms "first" and "second" in this solution are used for descriptive purposes only and should not be construed as indicating or implying a ranking of importance or implicitly specifying the number of technical features shown. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of such features. In this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0029] The utility model discloses a spliced ​​stator, comprising: a stator core and a winding, such as Figure 1-Figure 4 As shown, the stator core adopts a tooth-yoke separation structure, including a ring-shaped stator yoke portion 1 and a stator tooth portion 2 concentrically arranged on the inner periphery of the stator yoke portion 1 .

[0030] The stator tooth portion 2 includes a gear ring 203 and stator teeth 201 arranged at equal angles on the outer periphery of the gear ring 203. Each stator tooth 201 on the outer periphery of the gear ring 203 is a rectangular stator tooth 201 of the same shape, so that the gap between two adjacent stator teeth 201 forms a trapezoidal stator slot 202 that gradually expands from the inside to the outside. The outer end of the stator slot 202 is open, and the inner periphery of the stator yoke 1 is provided with a limiting slot with the same number and matching shape as the stator teeth 201. 102, the outer ends of the stator teeth 201 are embedded in the corresponding limiting grooves 102, and a limiting block 101 matching the opening of the outer end of the stator slot 202 is formed between two adjacent limiting grooves 102, and the limiting blocks 101 are embedded in the opening of the corresponding stator slot 202. Through the one-to-one cooperation between the stator teeth 201 and the limiting grooves 102, and the stator slots 202 and the limiting blocks 101, a tight connection between the stator tooth part 2 and the stator yoke part 1 is ensured.

[0031] An accommodating space is formed between each of the limit blocks 101 and its corresponding stator slot 202, and the accommodating space is used to pass through the winding. The winding includes a plurality of conductors 3, and the conductor 3 includes two parallel plug-in ends. The first ends of the two plug-in ends are connected by a connecting end 303. In some embodiments, the connecting end 303 is integrally formed with the two plug-in ends, and the connecting end 303 is formed by twisting the first ends of the two plug-in ends. The second ends of the two plug-in ends are each bent to form two pins 304. The two plug-in ends are respectively axially passed through the accommodating spaces of different stator slots 202, and the connecting end 303 and the pins 304 respectively extend to the outside of the two ends of the accommodating space. In a preferred embodiment, all conductors 3 in the winding have the same shape.

[0032] like Figure 7 As shown, in some embodiments, each conductor 3 includes a first plug-in end 301 and a second plug-in end 302, the first plug-in end 301 is close to the inner end of the stator slot 202, and the second plug-in end 302 is close to the outer end of the stator slot 202. The cross-sections of the first plug-in end 301 and the second plug-in end 302 are both trapezoidal, and the long side width of the cross-section of the first plug-in end 301 is less than or equal to the short side width of the second plug-in end 302. The accommodating space of each stator slot 202 is sequentially provided with 2-4 layers of plug-in parts from the inside to the outside. In one embodiment, as shown in FIG. Figure 5 、 Figure 6 As shown, it is a two-layer winding structure, wherein each stator slot 202 is filled with a first plug-in end 301 and a second plug-in end 302. The first plug-in end 301 is close to the inner end of the stator slot 202, and the first plug-in ends 301 of all conductors 3 together form a first layer of winding, and the second plug-in end 302 is close to the outer end of the stator slot 202, and the second plug-in ends 302 of all conductors 3 together form a second layer of winding, thereby simplifying the winding structure and production process; in other embodiments, on the basis of the two-layer winding structure, 1-2 layers of windings can be further superimposed according to the size of the accommodating space in the stator slot 202, so that 3-4 layers of plug-in parts are sequentially provided in the accommodating space of each stator slot 202 from the inside to the outside. The specific winding method of the multi-layer winding can adopt the existing technology and will not be repeated here.

[0033] like Figure 7 、 Figure 8As shown, in some embodiments, the plug-in ends of the conductors 3 are integrally punched from a plurality of trapezoidal copper foil sheets 5. In one embodiment, the pins 304 are formed by bending the second end of the plug-in end. The connecting end 303 and the plug-in end are separate structures, and the connecting end 303 is welded to the first ends of the two plug-in ends respectively. In one embodiment, the conductors 3 are integrally punched from a plurality of trapezoidal copper foil sheets 5, and are bent in sequence after stamping to form a connecting portion, a plug-in end and a pin 304. Specifically, the middle portion of the conductor 3 is bent to form the connecting end 303 at the bending portion of the middle portion, and two parallel plug-in ends are formed at both ends of the connecting end 303. Subsequently, the other ends of the two plug wires are bent outward to form two pins 304.

[0034] In one embodiment, the stator tooth portion 2 is formed by stacking and stamping multiple layers of first silicon steel sheets of the same shape, and the stator yoke portion 1 is formed by stacking and stamping multiple layers of second silicon steel sheets of the same shape, wherein the stator tooth portion 2 is formed by axially stacking and integrally stamping multiple first silicon steel sheets, and the stator yoke portion 1 is formed by axially stacking and integrally stamping multiple second silicon steel sheets.

[0035] An insulating member 4 is further provided between the plug-in end of the conductor 3 and the inner wall of the accommodating space, and both ends of the insulating member 4 extend to the outside of both ends of the accommodating space. In one embodiment, the insulating member 4 is insulating paper wrapped around the outer periphery of the plug-in end.

[0036] In some embodiments, the stator yoke 1 has multiple cooling holes 103 distributed at equal angles along the circumferential direction. The cooling holes 103 are arranged along the axial direction of the stator yoke 1 so that the cooling medium flows along the multiple cooling holes 103 evenly distributed in the stator yoke 1.

[0037] like Figure 1 、 Figure 2 、 Figure 4 As shown, in some embodiments, a magnetic isolation groove 204 is provided at the inner end of each stator slot 202 on the gear ring 203. The magnetic isolation groove 204 is arranged along the radial direction of the gear ring 203, and the width of the magnetic isolation groove 204 is smaller than the width of the inner end of the stator slot 202. The magnetic isolation groove 204 can reduce the excitation current, improve efficiency, avoid excessive torque fluctuations, and thus reduce the loss of the stator core.

[0038] The present invention also discloses a motor, comprising any of the above-described spliced ​​stators. Other structures of the motor can be referred to the prior art and will not be described in detail here.

[0039] There are many implementation methods for the present utility model, and all technical solutions formed by equivalent transformation or equivalent transformation fall within the protection scope of the present utility model.

Claims

1. Spliced ​​stator, characterized by: include: The stator core and windings, the stator core includes a ring-shaped stator yoke and a stator tooth portion concentrically arranged on the inner periphery of the stator yoke, the stator tooth portion includes a gear ring and stator teeth arranged at equal angles on the outer periphery of the gear ring, each stator tooth on the outer periphery of the gear ring is a rectangular stator tooth of the same shape, so that the gap between two adjacent stator teeth forms a trapezoidal stator slot that gradually expands from the inside to the outside, the outer end of the stator slot is open, the inner periphery of the stator yoke is provided with limiting slots of the same number and shape as the stator teeth, the outer ends of the stator teeth are all embedded in the corresponding limiting slots, A limit block matching the opening at the outer end of the stator slot is formed between two adjacent limit slots, and the limit blocks are all embedded in the opening of the stator slot corresponding to them, and an accommodation space is formed between each limit block and the stator slot corresponding to it; the winding includes a plurality of conductors, and the conductor includes two plug-in ends arranged in parallel, the first ends of the two plug-in ends are connected by a connecting end, and the second ends of the two plug-in ends are each bent to form two pins, and the two plug-in ends are respectively axially arranged in the accommodation space of different stator slots, and the connecting end and the pins respectively extend to the outside of the two ends of the accommodation space.

2. The spliced ​​stator according to claim 1, characterized in that: Each conductor includes a first plug-in end and a second plug-in end, the first plug-in end is close to the inner end of the stator slot, and the second plug-in end is close to the outer end of the stator slot. The cross-sections of the first plug-in end and the second plug-in end are both trapezoidal, and the long side width of the cross-section of the first plug-in end is less than or equal to the short side width of the second plug-in end.

3. The spliced ​​stator according to claim 2, characterized in that: The plug-in ends of the conductors are formed by integrally punching a plurality of trapezoidal copper foil sheets.

4. The spliced ​​stator according to claim 2, characterized in that: The accommodating space of each stator slot is provided with 2 to 4 layers of plug-in parts in sequence from the inside to the outside.

5. The spliced ​​stator according to claim 1, characterized in that: The stator teeth are formed by stacking and punching multiple layers of first silicon steel sheets with the same shape, and the stator yoke is formed by stacking and punching multiple layers of second silicon steel sheets with the same shape.

6. The spliced ​​stator according to claim 1, characterized in that: An insulating member is further provided between the plug-in end of the conductor and the inner wall of the accommodating space, and both ends of the insulating member extend to the outside of both ends of the accommodating space.

7. The spliced ​​stator according to claim 1, characterized in that: The stator yoke is provided with a plurality of cooling through holes distributed at equal angles along the circumferential direction, and the cooling through holes are arranged along the axial direction of the stator yoke.

8. The spliced ​​stator according to claim 1, characterized in that: A magnetic isolation groove is provided at the inner end of each stator slot on the gear ring. The magnetic isolation groove is arranged along the radial direction of the gear ring, and the width of the magnetic isolation groove is smaller than the width of the inner end of the stator slot.

9. The motor is characterized by: It comprises a spliced ​​stator as described in any one of claims 1-8.

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