Asymmetric notch punching sheet group structure and permanent magnet brushless motor stator structure
By adopting an asymmetric slot lamination group structure in the stator of a permanent magnet brushless motor, and utilizing a combination design of inclined and straight sides, the problem of increased cogging torque caused by traditional parallel symmetrical slots is solved, thereby improving the motor production qualification rate and cost.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU YONGLI AUTOMOBILE TECHNOLOGY CO LTD
- Filing Date
- 2025-03-26
- Publication Date
- 2026-04-17
AI Technical Summary
The slot shape of the stator of a traditional permanent magnet brushless motor is a parallel and symmetrical structure, which leads to an increase in cogging torque, affecting the motor's yield rate and production quality and cost.
An asymmetric slot lamination assembly structure is adopted, including a first lamination, a second lamination, and a third lamination. The asymmetric slots are formed by combining inclined and straight sides. The splicing is achieved by using protrusions and slots, which disrupts the symmetry of the slot effect during the rotor's passage through the slot.
This reduces cogging torque, improves the yield rate of motor production, and lowers production quality costs.
Smart Images
Figure CN224138774U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of motor positioning structure design technology, specifically to an asymmetric slot lamination assembly structure and a permanent magnet brushless motor stator structure. Background Technology
[0002] The slot shape of a permanent magnet brushless motor has a significant impact on the cogging torque. The slot width and shape affect the winding process, the lifespan of the die-cutting edge, and the magnitude of the cogging torque. Traditional permanent magnet brushless motor stator slots are designed with a specific width along the normal direction of the radius. The two sides of the slot adopt a parallel and symmetrical structure. The minimum gap is determined by installation experience and the wire diameter selected for the motor. Theoretically, no slots are ideal, but in practice, gaps are necessary due to process requirements. Parallel slot shapes increase the cogging torque of the motor, affecting the motor's yield rate and increasing production quality costs. Utility Model Content
[0003] To overcome the above-mentioned shortcomings, the purpose of this application is to provide an asymmetric slot lamination assembly structure and a permanent magnet brushless motor stator structure, thereby effectively solving the above-mentioned technical problems.
[0004] To achieve the above objectives, this application adopts the following technical solution:
[0005] In a first aspect, this application provides an asymmetric slotted lamination assembly structure, the lamination assembly including a first lamination, a second lamination, and a third lamination, the second lamination being located between the first lamination and the third lamination, a first side of the second lamination being spliced with the first lamination, and a second side of the second lamination opposite to the first side being spliced with the third lamination, the first lamination, the second lamination, and the third lamination having the same structure, each including a first end and a second end, the side of the first end being an inclined side, and the side of the second end being a straight side, a first slot being formed between the second end of the first lamination and the first end of the second lamination, and a second slot being formed between the second end of the second lamination and the first end of the third lamination, the first slot and the second slot being asymmetrically arranged.
[0006] Furthermore, the side of the first end of the second lamination is not parallel to the line of symmetry between the first lamination and the second lamination and forms an angle of 10 degrees.
[0007] Furthermore, the side of the second end of the second lamination is parallel to the line of symmetry between the second lamination and the third lamination.
[0008] Furthermore, the first, second, and third stampings each include a slot on a first side and a protrusion on a second side, wherein the protrusion is engaged in the slot to allow the first, second, and third stampings to be sequentially spliced together.
[0009] Secondly, this application also provides a permanent magnet brushless motor stator structure, which includes any of the asymmetric slot lamination group structures described in the previous application.
[0010] Beneficial effects
[0011] This application provides an asymmetric slot lamination assembly structure and a permanent magnet brushless motor stator structure. The asymmetric slot structure design allows the slot effect to be balanced and disrupted symmetrically during the rotor's passage through the slots, thereby reducing cogging torque, greatly improving the production yield, and reducing production quality costs. Attached Figure Description
[0012] The accompanying drawings are provided to illustrate the technical solutions of this disclosure and form part of the specification. They are used together with the embodiments of this disclosure to explain the technical solutions of this disclosure and do not constitute a limitation on the technical solutions of this disclosure. The shapes and sizes of the components in the drawings do not reflect actual proportions and are only intended to illustrate the content of this application.
[0013] Figure 1 This is a schematic diagram of a lamination assembly structure provided in an embodiment of this application.
[0014] Figure 2 This is a schematic diagram of a motor stator structure provided in another embodiment of this application.
[0015] Figure 3 A diagram showing the over-slot torque of a motor designed for a symmetrical slot structure.
[0016] Figure 4 A diagram showing the over-slot torque of a motor designed for an asymmetrical slot structure.
[0017] In the above attached figures,
[0018] 1. First stamping; 2. Second stamping; 3. Third stamping; a. First end; b. Second end; 100. First slot; 200. Second slot; 4. Slot; 5. Protrusion. Detailed Implementation
[0019] The above-described solution will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of this application. The implementation conditions used in the embodiments may be further adjusted according to the conditions of specific manufacturers, and the implementation conditions not specified are generally those in routine experiments.
[0020] Unless otherwise defined, the technical or scientific terms used in the embodiments of this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. In this document, "electrical connection" includes the situation where constituent elements are connected together by an element having some electrical function. There is no particular limitation on the "electrically functioning element," as long as it enables the transmission and reception of electrical signals between the connected constituent elements. An "electrically functioning element" can be, for example, an electrode or wiring, a switching element such as a transistor, or other functional elements such as a resistor, inductor, or capacitor. "Up," "down," "left," and "right" are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.
[0021] In this application, the terms "upper," "lower," "inner," "middle," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.
[0022] Example 1
[0023] One embodiment of this application provides an asymmetric slotted lamination assembly structure, such as... Figure 1As shown, the stamping assembly includes a first stamping 1, a second stamping 2, and a third stamping 3. The second stamping 2 is located between the first stamping 1 and the third stamping 3. The first side of the second stamping 2 is joined to the first stamping 1, and the second side of the second stamping 2, opposite to the first side, is joined to the third stamping 3. The first stamping 1, the second stamping 2, and the third stamping 3 have the same structure, each including a slot 4 on the first side and a protrusion 5 on the second side. The protrusion 5 is engaged in the slot 4 to allow the first stamping 1, the second stamping 2, and the third stamping 3 to be sequentially joined. Simultaneously, the first stamping 1, the second stamping 2, and the third stamping 3 each include a first end a and a second end b. The side of the first end a is an inclined side, and the side of the second end b is a straight side. A first slot 100 is formed between the second end b of the first lamination 1 and the first end a of the second lamination 2, and a second slot 200 is formed between the second end b of the second lamination 2 and the first end a of the third lamination 3. The first slot 100 and the second slot 200 are asymmetrically arranged. The side of the first end a of the second lamination 2 is not parallel to the line of symmetry between the first lamination 1 and the second lamination 2 and forms an angle of 10 degrees. The side of the second end b of the second lamination 2 is parallel to the line of symmetry between the second lamination 2 and the third lamination 3. This application adopts an asymmetrical slot structure design. The asymmetrical structure makes the slot effect symmetrically balanced and disrupted during the rotor's passage through the slot, thereby reducing the cogging torque, greatly improving the production qualification rate, and reducing production quality costs.
[0024] Example 2
[0025] Another embodiment of this application also provides a stator structure for a permanent magnet brushless motor, such as... Figure 2 As shown, the stator structure of the permanent magnet brushless motor includes the asymmetric slot lamination group structure in Embodiment 1 above, such as... Figure 3 and Figure 4 As shown, Figure 3 and Figure 4 In the figure, the horizontal axis represents the angle of the circumference, and the vertical axis represents the energy value. The asymmetrical slot structure design shows that it reduces energy by 10-20% compared to the symmetrical slot structure.
[0026] The above embodiments are only for illustrating the technical concept and features of this application, and are intended to enable those skilled in the art to understand the content of this application and implement it accordingly. They should not be used to limit the scope of protection of this application. All equivalent changes or modifications made in accordance with the spirit and essence of this application should be included within the scope of protection of this application.
Claims
1. An asymmetric notched-blade pack configuration, characterized by: The stamping assembly includes a first stamping, a second stamping, and a third stamping. The second stamping is located between the first stamping and the third stamping. A first side of the second stamping is joined to the first stamping, and a second side of the second stamping opposite to the first side is joined to the third stamping. The first, second, and third stampings have the same structure, each including a first end and a second end. The side of the first end is an inclined side, and the side of the second end is a straight side. A first groove is formed between the second end of the first stamping and the first end of the second stamping, and a second groove is formed between the second end of the second stamping and the first end of the third stamping. The first groove and the second groove are asymmetrically arranged.
2. The asymmetric slotted lamination assembly structure as described in claim 1, characterized in that: The side of the first end of the second lamination is not parallel to the line of symmetry between the first lamination and the second lamination and forms an angle of 10 degrees.
3. The asymmetric slotted lamination assembly structure as described in claim 2, characterized in that: The side of the second end of the second lamination is parallel to the line of symmetry between the second lamination and the third lamination.
4. The asymmetric slotted lamination assembly structure as described in claim 1, characterized in that: The first, second, and third stampings each include a slot on a first side and a protrusion on a second side. The protrusion is engaged in the slot so that the first, second, and third stampings can be sequentially spliced together.
5. A permanent magnet brushless motor stator structure, characterized by: The stator structure of the permanent magnet brushless motor includes the asymmetric slot lamination group structure as described in any one of claims 1-4.