A rotor structure for a drive motor

Abstract

This invention provides a rotor structure for a drive motor, comprising: rotor laminations having a plurality of magnetic slots; and a magnetic block embedded in the magnetic slots, wherein the magnetic block is a single-pole integrated structure, and the overall shape of the magnetic block is adapted to the inner cavity of the magnetic slot. This invention, by designing the traditional multi-piece, separate magnetic block as a single-pole integrated magnetic block, perfectly matches the shape of the rotor magnetic slot, achieving an assembly effect of "pole formation upon placement." This fundamentally eliminates the inherent process redundancy and accumulated tolerance problems of multi-piece assembly, thereby improving rotor assembly efficiency, magnetic pole positioning accuracy, and mechanical reliability, and effectively improving the torque output performance of the motor.

Description

Technical Field

[0001] This utility model relates to the field of rotor magnet design technology, specifically to a rotor structure for a drive motor. Background Technology

[0002] As a core component of new energy electric drive systems, the performance and reliability of permanent magnet synchronous motors directly affect the energy efficiency and quality of the entire vehicle. In rotor design, the arrangement and fixing method of magnets have a significant impact on the motor's electromagnetic performance, mechanical stability, and manufacturing process.

[0003] Currently, rotor magnet designs widely adopt built-in rotor topologies such as V-type or double V-type, for example... Figure 1 As shown, its magnetic poles are typically composed of multiple independent individual magnets assembled to meet the requirements of magnetic circuit design and magnetization direction. However, existing multi-piece split magnet structures have the following problems in practical applications: First, the assembly process is complex and cumbersome. Each magnetic pole requires the sequential installation of multiple independent magnet units. Operators (or automated equipment) need to perform multiple actions of picking up, placing, positioning, adjusting, and fixing, which significantly increases the assembly steps and time for a single motor, reduces the production cycle, and restricts the improvement of production capacity.

[0004] Secondly, since each individual magnet has individual positioning errors during installation, such as position offset and angle deviation, the errors of multiple magnets will accumulate within a magnetic pole or even the entire circumference, resulting in a decrease in the overall positional accuracy of the magnets. This not only affects the performance consistency of a single magnetic pole, but may also lead to overall rotor dynamic balance problems, increased air gap magnetic field harmonics, and thus deteriorate the NVH (noise, vibration and harshness) performance and efficiency of the motor.

[0005] It is evident that there is an urgent need to design a magnet rotor topology that can simplify the magnet assembly process of permanent magnet motor rotors and improve assembly efficiency and precision. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides a rotor structure for a drive motor, comprising: The rotor laminations have several magnetic slots; A magnetic steel block is embedded in the magnetic steel groove. The magnetic steel block has a single magnetic pole integrated structure, and the overall shape of the magnetic steel block is adapted to the inner cavity of the magnetic steel groove.

[0007] Furthermore, the magnetic block has a double V-shaped structure.

[0008] Furthermore, the magnet block includes a first V-shaped portion, a second V-shaped portion, and a connecting portion connecting the first V-shaped portion and the second V-shaped portion, wherein the first V-shaped portion, the second V-shaped portion, and the connecting portion are integrally formed.

[0009] Furthermore, the connecting portion is parallel to the center line of the rotor lamination.

[0010] Furthermore, the thicknesses of the first V-shaped portion, the second V-shaped portion, and the connecting portion are denoted as W1, W2, and W3, respectively, and they satisfy the relationship: 1.5mm < W3 < W2 < W1.

[0011] Furthermore, the included angle of the V-shaped portion formed by the second V-shaped portion is greater than the included angle of the opening of the first V-shaped portion.

[0012] Furthermore, the ends of the first V-shaped portion and the second V-shaped portion are provided with grooves, and the grooves cooperate with the protruding structure of the inner cavity of the magnet groove for positioning.

[0013] Furthermore, the magnet block and the magnet groove are fitted with a clearance, and the contact surfaces of the magnet block and the magnet groove are coated with an adhesive.

[0014] Compared with the prior art, the present invention has the following beneficial effects: This invention redesigns the traditional multi-piece split magnet block into a single-pole integrated magnet block, making it perfectly compatible with the shape of the rotor magnet slot. This achieves the "pole formation upon placement" assembly effect, fundamentally eliminating the inherent process redundancy and cumulative tolerance problems of multi-piece assembly. This improves rotor assembly efficiency, magnetic pole positioning accuracy, and mechanical reliability, and effectively enhances the torque output performance of the motor. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a magnet block structure in the prior art, showing a split structure of the magnet block; Figure 2 This is a schematic diagram of the magnet block structure disclosed in an embodiment of the present utility model, showing the integrated structure of the magnet block; Figure 3 This is a schematic diagram of the rotor structure disclosed in an embodiment of the present utility model; Figure 4 A comparison curve of output torque between a conventional rotor design and the rotor design provided by this utility model.

[0016] In the picture: 10. Rotor laminations; 20. Magnet block; 21. First V-shaped part; 22. Second V-shaped part; 23. Connecting part; 24. Groove. Detailed Implementation

[0017] To make the technical solutions and effects of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0018] This utility model aims to provide a rotor structure for a drive motor, mainly solving the problems of process redundancy and cumulative tolerance inherent in the assembly of multiple magnet blocks. Please refer to... Figure 1 It mainly includes rotor laminations 10 and magnet blocks 20, wherein the rotor laminations 10 are provided with several magnet slots along the circumference; the magnet blocks 20 are embedded in the magnet slots.

[0019] Please see Figure 2 , 3 The following provides further explanation of the magnet block 20.

[0020] In this design, the magnet block 20 is a single-pole integrated structure, and its overall shape is adapted to the inner cavity of the magnet groove. Furthermore, the magnet block 20 has a double V-shaped structure.

[0021] Specifically, the magnet block 20 includes a first V-shaped portion 21, a second V-shaped portion 22, and a connecting portion 23 connecting the first V-shaped portion 21 and the second V-shaped portion 22. The first V-shaped portion 21, the second V-shaped portion 22, and the connecting portion 23 are integrally formed. The included angle of the V-shape formed by the second V-shaped portion 22 is greater than the included angle of the opening of the first V-shaped portion 21. The connecting portion 23 is parallel to the center line of the rotor lamination 10. Let the thicknesses of the first V-shaped portion 21, the second V-shaped portion 22, and the connecting portion 23 be W1, W2, and W3, respectively, satisfying the relationship: 1.5mm < W3 < W2 < W1.

[0022] In a further embodiment, the magnet block 20 is fitted with the magnet groove with a clearance, and the contact surface between the magnet block 20 and the magnet groove is coated with an adhesive.

[0023] In a further embodiment, the axial ends of the first V-shaped portion 21 and the second V-shaped portion 22 are provided with grooves 24. The grooves 24 cooperate with the protruding structure of the inner cavity of the magnet slot to limit the movement. On the one hand, this eliminates the possibility of the magnet block 20 rotating relative to the rotor lamination 10. On the other hand, during the assembly process, the grooves 24 and the protruding structure can serve as guides and positioning references to ensure that workers or automated equipment can quickly and accurately place the magnet block 20 in the only correct position, achieving "one-time placement to form poles" assembly.

[0024] Please see Figure 4The comparison curves showing the output torque between the conventional rotor design and the rotor design provided by this invention demonstrate that the output torque of the rotor structure provided by this invention is greater than that of the conventional rotor design. This is because the integrated design of the double V-magnets eliminates the assembly gaps and positioning errors between the separate magnets, reducing the increase in magnetic circuit reluctance and magnetic field distortion caused by the assembly process. This allows the magnetic flux generated by the permanent magnets to more fully and accurately form an effective main magnetic flux through the air gap, thereby improving the torque output performance of the motor. Simultaneously, the integrated structure significantly enhances the rotor's reliability due to its increased mechanical robustness.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A rotor structure for a drive motor, characterized in that, include: The rotor lamination (10) has several magnetic slots; A magnetic steel block (20) is embedded in the magnetic steel groove. The magnetic steel block (20) is a single magnetic pole integrated structure. The overall shape of the magnetic steel block (20) is adapted to the inner cavity of the magnetic steel groove.

2. The rotor structure of the drive motor according to claim 1, characterized in that, The magnetic block (20) has a double V-shaped structure.

3. The rotor structure of the drive motor according to claim 1 or 2, characterized in that, The magnetic block (20) includes a first V-shaped part (21), a second V-shaped part (22), and a connecting part (23) connecting the first V-shaped part (21) and the second V-shaped part (22). The first V-shaped part (21), the second V-shaped part (22), and the connecting part (23) are integrally formed.

4. The rotor structure of the drive motor according to claim 3, characterized in that, The V-shaped angle formed by the second V-shaped part (22) is greater than the opening angle of the first V-shaped part (21).

5. The rotor structure of the drive motor according to claim 3, characterized in that, The connecting part (23) is parallel to the center line of the rotor lamination (10).

6. The rotor structure of the drive motor according to claim 3, characterized in that, The thicknesses of the first V-shaped portion (21), the second V-shaped portion (22), and the connecting portion (23) are denoted as W1, W2, and W3, respectively, and they satisfy the relationship: 1.5mm < W3 < W2 < W1.

7. The rotor structure of the drive motor according to claim 3, characterized in that, The ends of the first V-shaped part (21) and the second V-shaped part (22) are provided with grooves (24), and the grooves (24) cooperate with the protruding structure of the inner cavity of the magnet groove for positioning.

8. The rotor structure of the drive motor according to claim 1, characterized in that, The magnet block (20) is fitted with the magnet groove with a clearance, and the contact surface between the magnet block (20) and the magnet groove is coated with an adhesive.

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