Rotor punching sheet, driving motor and vehicle

Abstract

The utility model discloses a rotor punching sheet, a driving motor and a vehicle, the rotor punching sheet comprises a punching sheet body, the punching sheet body is provided with a plurality of magnetic pole units along the circumferential direction, each magnetic pole unit is provided with an inner layer magnetic steel groove group and an outer layer magnetic steel groove group, the outer-layer magnetic steel groove group is arranged on the outer side of the inner-layer magnetic steel groove group in the radial direction of the punching sheet body; the inner layer magnetic steel groove group and the outer layer magnetic steel groove group are V-shaped; two first auxiliary grooves are formed in the outer circle of each magnetic pole unit, and the two first auxiliary grooves are symmetrical about the central axis of the inner-layer magnetic steel groove group; the punching sheet body is provided with a circle center, the included angles between the two end points of the inner-layer magnetic steel groove group in the circumferential direction of the punching sheet body and the circle center are beta, and the positions of the first auxiliary grooves are related to the included angles beta. According to the utility model, the torque ripple of the motor can be reduced, the counter potential waveform sine degree of the motor is improved, the electromagnetic force of the motor is reduced, and the NVH of the motor is improved.

Description

Technical Field

[0001] This utility model relates to new energy vehicles, specifically to a rotor lamination, a drive motor, and a vehicle. Background Technology

[0002] As new energy vehicles represent a mainstream trend in the automotive industry, the performance optimization of their core component—the drive motor system—is particularly crucial. Among these, NVH (Noise, Vibration, and Harshness) characteristics are a key indicator for evaluating the quality of a drive motor system, directly impacting the driving and riding comfort of the driver and passengers. Improper NVH control of the drive motor can lead to undesirable phenomena such as motor whine and vibration transmission to the vehicle body, severely reducing passenger comfort and potentially causing strong customer dissatisfaction and frequent complaints, thereby affecting the product's market reputation and competitiveness. Therefore, in-depth optimization of the drive motor's NVH characteristics has become an indispensable and crucial step in the design of new energy vehicle powertrains. Existing technologies often employ short-pitch double-layer windings, which can improve the electromotive force and magnetomotive force waveforms to reduce motor NVH, but the effect is not significant. Other solutions use skewed poles or slots to reduce electromagnetic force, but this increases the manufacturing difficulty of the motor and reduces its output torque, affecting overall vehicle performance. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a rotor lamination, a drive motor and a vehicle that can optimize the magnetic circuit structure to improve the magnetic flux path, thereby reducing the torque ripple of the motor, improving the sinusoidal nature of the back EMF waveform of the motor, reducing the electromagnetic force of the motor and improving the NVH of the motor.

[0004] This utility model discloses a rotor lamination, comprising a lamination body, wherein multiple magnetic pole units are arranged circumferentially on the lamination body, and each magnetic pole unit is provided with an inner layer magnetic steel slot group and an outer layer magnetic steel slot group. In the radial direction of the lamination body, the outer layer magnetic steel slot group is located outside the inner layer magnetic steel slot group; both the inner layer magnetic steel slot group and the outer layer magnetic steel slot group are V-shaped; two first auxiliary slots are formed on the outer circumference of each magnetic pole unit, and the two first auxiliary slots are symmetrical about the central axis of the inner layer magnetic steel slot group.

[0005] The lamination body has a center, and the two endpoints of the inner magnetic steel groove group in the circumferential direction of the lamination body form an angle β with the center; wherein the angle between the line connecting one of the first auxiliary grooves to the center of the lamination body and the line connecting the other first auxiliary groove to the center of the lamination body is φ2; wherein, 0.5β≤φ2≤0.95β.

[0006] Furthermore, two second auxiliary slots are formed on the outer circumference of each magnetic pole unit, and the two second auxiliary slots are symmetrical about the central axis of the outer magnetic steel slot group;

[0007] The angle between the two endpoints of the outer magnetic steel groove group on the circumferential direction of the lamination body and the center of the circle is α; wherein the angle between the line connecting one of the second auxiliary grooves and the center of the lamination body and the line connecting the other second auxiliary groove and the center of the lamination body is φ1; wherein, 0.5α≤φ1≤0.95α.

[0008] Furthermore, the number of magnetic pole units is N; where, and

[0009] Furthermore, the V-angle of the outer magnetic steel groove group is θ1, and the V-angle of the inner magnetic steel groove group is θ2; wherein, 155°≤θ1≤175°, and 80°≤θ2≤100°.

[0010] Furthermore, the depths of the first auxiliary groove and the second auxiliary groove are 0.5mm-1.2mm.

[0011] Furthermore, the first auxiliary groove and the second auxiliary groove are semi-circular, semi-elliptical, triangular or polygonal.

[0012] Furthermore, the inner layer magnetic steel groove group includes two inner layer grooves, and a permanent magnet is respectively disposed inside the two inner layer grooves; the outer layer magnetic steel groove group includes two symmetrically arranged outer layer grooves, and a permanent magnet is respectively disposed inside the two outer layer grooves.

[0013] Furthermore, a magnetic isolation hole is provided between the two inner layer grooves, and the magnetic isolation hole and the two inner layer grooves form a "V" or "A" shaped magnetic isolation bridge.

[0014] One type of drive motor in this invention includes the aforementioned rotor laminations.

[0015] One type of vehicle according to this utility model includes the aforementioned drive motor.

[0016] The beneficial effects of this utility model are: this utility model can optimize the magnetic circuit structure to improve the magnetic flux path, thereby reducing the torque ripple of the motor, improving the sinusoidal nature of the back EMF waveform of the motor, reducing the electromagnetic force of the motor, and improving the NVH of the motor. Attached Figure Description

[0017] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the following drawings are provided for illustration:

[0018] Figure 1This is a schematic diagram of the magnetic pole unit of this utility model (only the first auxiliary slot is provided, but the second auxiliary slot is not provided);

[0019] Figure 2 This is a schematic diagram of the structure of the magnetic pole unit of this utility model (with a first auxiliary slot and a second auxiliary slot provided simultaneously);

[0020] Figure 3 This is a schematic diagram showing the positions of the included angles α, φ1, β, and φ2 of the magnetic pole unit of this utility model;

[0021] Figure 4 This is a schematic diagram showing the positions of the included angles θ1 and θ2 of the magnetic pole unit of this utility model;

[0022] Figure 5 This is a schematic diagram comparing the simulated peak inflection point electromagnetic force density of this invention with that of the prior art;

[0023] Figure 6 This is a schematic diagram comparing the electromagnetic force density at the simulated high-speed resonance point of this utility model with that of the prior art;

[0024] Figure 7 This is a schematic diagram comparing the noise levels of this invention and existing technologies when applied to an electric drive system.

[0025] The following labels are used in the attached diagram: 1-Inner layer magnet groove group, 2-Outer layer magnet groove group, 3-First auxiliary groove, 4-Second auxiliary groove, 5-Magnetic isolation hole, 6-Magnetic isolation bridge. Detailed Implementation

[0026] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0027] like Figures 1-4 As shown, a rotor lamination in this embodiment includes a lamination body. The lamination body has multiple magnetic pole units arranged circumferentially. Each magnetic pole unit has an inner magnetic slot group 1 and an outer magnetic slot group 2. In the radial direction of the lamination body, the outer magnetic slot group 2 is located outside the inner magnetic slot group 1. Both the inner magnetic slot group 1 and the outer magnetic slot group 2 are V-shaped. Two first auxiliary slots 3 are formed on the outer circumference of each magnetic pole unit, and the two first auxiliary slots 3 are symmetrical about the central axis of the inner magnetic slot group 1.

[0028] The lamination body has a center, and the two endpoints of the inner magnetic steel groove group 1 in the circumferential direction of the lamination body form an angle β with the center; wherein the angle between the line connecting one of the first auxiliary grooves 3 and the center of the lamination body and the line connecting the other first auxiliary groove 3 and the center of the lamination body is φ2; wherein, 0.5β≤φ2≤0.95β.

[0029] The angle β between the two endpoints of the inner layer magnet slot group 1 in the circumferential direction of the lamination body and the center of the circle refers to: Figure 3 In the design, the center of the lamination body is point O. The angle between the line connecting the upper endpoint A of the inner magnetic slot group 1 to the center O and the line connecting the lower endpoint B of the inner magnetic slot group 1 to the center O is β. φ2 is related to β, and can be, for example, 0.5β, 0.6β, 0.7β, 0.85β, 0.95β, etc. By setting the second auxiliary slot 4, the magnetic circuit structure can be optimized to improve the magnetic flux path, thereby reducing the motor's torque ripple, improving the sinusoidal nature of the motor's back EMF waveform, reducing the motor's electromagnetic force, and improving the motor's NVH (noise, vibration, and harshness).

[0030] In this embodiment, two second auxiliary grooves 4 are formed on the outer circumference of each magnetic pole unit. The two second auxiliary grooves 4 are symmetrical about the central axis of the outer magnetic steel groove group 2. The central axis of the outer magnetic steel groove group 2 coincides with the central axis of the inner magnetic steel groove group 1. Figure 3 The middle is line l;

[0031] The angle between the two endpoints of the outer magnetic groove group 2 on the circumferential direction of the lamination body and the center of the circle is α; wherein the angle between the line connecting one of the second auxiliary grooves 4 and the center of the lamination body and the line connecting the other second auxiliary groove 4 and the center of the lamination body is φ1; wherein, 0.5α≤φ1≤0.95α. The angle between the two endpoints of the outer magnetic groove group 2 on the circumferential direction of the lamination body and the center of the circle is α means: in Figure 3 In the diagram, the center of the lamination body is point O. The angle between the line connecting the upper endpoint C of the outer magnetic slot group 2 and the center O, and the line connecting the lower endpoint D of the outer magnetic slot group 2 and the center O, is α. φ1 is related to α, and can be, for example, 0.5α, 0.6α, 0.7α, 0.85α, 0.95α, etc. By setting the second auxiliary slot 4, the magnetic circuit structure can be further optimized to improve the magnetic flux path, thereby further reducing the motor torque ripple, further improving the sinusoidal nature of the motor back EMF waveform, further reducing the motor electromagnetic force, and further improving the motor NVH. It is worth noting that the technical solution of only setting the first auxiliary slot 3 without setting the second auxiliary slot 4 (such as...) Figure 1 As shown), this can reduce the difficulty of motor NVH optimization and improve motor manufacturing processes. Meanwhile, the technical solution of simultaneously setting the first auxiliary slot 3 and the second auxiliary slot 4 (as shown) can reduce the difficulty of motor NVH optimization and improve motor manufacturing processes. Figure 2 As shown in the figure, the effect of improving motor NVH is better.

[0032] In this embodiment, the number of magnetic pole units is N; wherein, and The number of magnetic pole units is the number of poles of the drive motor; for example, N can be 8. In this case, 38.25°≤β≤42.75°, and 18°≤α≤22.5°. At this point, the motor has an optimal pole arc coefficient, which allows for a reasonable distribution of magnetic flow, improves the back EMF waveform, reduces harmonic content, lowers torque ripple, reduces electromagnetic force, and improves NVH (noise, vibration, and harshness).

[0033] In this embodiment, as Figure 4 As shown, the V-angle of the outer magnet slot group 2 is θ1, and the V-angle of the inner magnet slot group 1 is θ2; wherein 155°≤θ1≤175°, and 80°≤θ2≤100°. This results in a better magnetic flux distribution, with the amount of permanent magnets and magnetic circuit saturation within a reasonable range. This ensures that with a fixed amount of permanent magnets in the motor, a larger torque is output, thus improving the motor's output capacity.

[0034] In this embodiment, the depths of the first auxiliary groove 3 and the second auxiliary groove 4 are 0.5mm-1.2mm. The depths of the first auxiliary groove 3 and the second auxiliary groove 4 can be the same or different, allowing for adjustment of different levels of motor noise and optimization of motor NVH. For example, the depth of the first auxiliary groove 3 can be selected as 0.5mm, 0.7mm, 1.2mm, etc., and the depth of the second auxiliary groove 4 can be selected as 0.65mm, 0.8mm, 1.1mm, etc.

[0035] In this embodiment, the first auxiliary groove 3 and the second auxiliary groove 4 are semi-circular, semi-elliptical, triangular, or polygonal. Polygons can be rhomboid, quadrilateral, pentagonal, etc. The "line connecting the first auxiliary groove 3 to the center of the lamination body" mentioned above refers to the line connecting the deepest point (bottom of the groove) of the first auxiliary groove 3 to the center of the lamination body. Similarly, the "line connecting the second auxiliary groove 4 to the center of the lamination body" refers to the line connecting the deepest point (bottom of the groove) of the second auxiliary groove 4 to the center of the lamination body. It is worth noting that the shapes of the first auxiliary groove 3 and the second auxiliary groove 4 can be identical or different, allowing for adjustment of different levels of motor noise and optimization of motor NVH.

[0036] In this embodiment, the inner magnet slot group 1 includes two inner slots, each containing a permanent magnet; the outer magnet slot group 2 includes two symmetrically arranged outer slots, each containing a permanent magnet. The inner magnet slot group 1 and the outer magnet slot group 2 are V-shaped and consist of two separate slots, with a reasonably set included angle, which increases the magnetic flux area provided by the permanent magnets and improves the motor torque.

[0037] In this embodiment, a magnetic isolation hole 5 is provided between the two inner layer slots, forming a figure-eight or herringbone magnetic isolation bridge 6 between the magnetic isolation hole 5 and the two inner layer slots. This structure increases the length of the magnetic isolation bridge 6, effectively dispersing the stress caused by the high-speed rotation of the rotor and improving the strength of the motor rotor. Simultaneously, the longer path of the magnetic isolation bridge 6 effectively blocks the leakage flux generated by the permanent magnet, enhancing the motor's output capability.

[0038] One type of drive motor in this embodiment includes the rotor laminations described above.

[0039] The rotor laminations of the drive motor adopt the following technical solution: It has 8 magnetic pole units, each magnetic pole unit is provided with two first auxiliary slots 3 and two second auxiliary slots 4, α=20°, β=40°, φ2=0.75β, φ1≤0.85α, θ1=175°, and θ2=100°. The depth of the first auxiliary slots 3 and the second auxiliary slots 4 is 0.7mm. The first auxiliary slots 3 and the second auxiliary slots 4 are triangular, and the magnetic isolation bridge 6 is in the shape of an "8". Figure 5 and Figure 6 As shown, simulations of the drive motor reveal that, compared to existing technologies, the electromagnetic force density of each order is significantly reduced under low-speed, high-torque conditions and high-speed resonance point conditions. In particular, the amplitude of the 48th order electromagnetic force density decreases by over 70%, resulting in a significant improvement in NVH (Noise, Vibration, and Harshness). Figure 7 As shown, the actual motor was installed and applied to a certain electric drive system. The subjective NVH of the electric drive system was significantly reduced (sample A in the figure is the existing technical solution, and sample B is the technical solution of this embodiment). The low-speed 48th-order noise amplitude was reduced by 10dB, and the high-speed 48th-order noise amplitude was reduced by 20dB. Furthermore, after objective data testing and analysis of the whole vehicle, the motor noise was reduced by 4.5dB, the overall vehicle NVH was significantly improved, and the overall vehicle driving comfort was enhanced.

[0040] One vehicle in this embodiment includes the aforementioned drive motor.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A rotor lamination, characterized in that: The device includes a lamination body, which has multiple magnetic pole units arranged circumferentially. Each magnetic pole unit is provided with an inner magnetic steel groove group (1) and an outer magnetic steel groove group (2). In the radial direction of the lamination body, the outer magnetic steel groove group (2) is located outside the inner magnetic steel groove group (1). Both the inner magnetic steel groove group (1) and the outer magnetic steel groove group (2) are V-shaped. Two first auxiliary grooves (3) are opened at the outer circle of each magnetic pole unit. The two first auxiliary grooves (3) are symmetrical about the central axis of the inner magnetic steel groove group (1). The lamination body has a center, and the two endpoints of the inner magnetic steel groove group (1) in the circumferential direction of the lamination body form an angle β with the center; wherein the angle between the line connecting one of the first auxiliary grooves (3) and the center of the lamination body and the line connecting the other first auxiliary groove (3) and the center of the lamination body is φ2; wherein, 0.5β≤φ2≤0.95β.

2. The rotor lamination according to claim 1, characterized in that: Two second auxiliary slots (4) are formed on the outer circumference of each magnetic pole unit, and the two second auxiliary slots (4) are symmetrical about the central axis of the outer magnetic steel slot group (2); The angle between the two endpoints of the outer magnetic steel groove group (2) on the circumferential direction of the lamination body and the center of the circle is α; wherein the angle between the line connecting one of the second auxiliary grooves (4) and the center of the lamination body and the line connecting the other second auxiliary groove (4) and the center of the lamination body is φ1; wherein, 0.5α≤φ1≤0.95α.

3. The rotor lamination according to claim 2, characterized in that: The number of magnetic pole units is N; where... ,and .

4. The rotor lamination according to any one of claims 1-3, characterized in that: The V-angle of the outer magnetic steel groove group (2) is θ1, and the V-angle of the inner magnetic steel groove group (1) is θ2; wherein, 155°≤θ1≤175°, and 80°≤θ2≤100°.

5. The rotor lamination according to claim 2, characterized in that: The depths of the first auxiliary groove (3) and the second auxiliary groove (4) are 0.5mm-1.2mm.

6. The rotor lamination according to claim 5, characterized in that: The first auxiliary groove (3) and the second auxiliary groove (4) are semicircular, semielliptical, triangular or polygonal.

7. The rotor lamination according to claim 1, characterized in that: The inner layer magnetic steel groove group (1) includes two inner layer grooves, and a permanent magnet is respectively arranged inside the two inner layer grooves; the outer layer magnetic steel groove group (2) includes two symmetrically arranged outer layer grooves, and a permanent magnet is respectively arranged inside the two outer layer grooves.

8. The rotor lamination according to claim 7, characterized in that: A magnetic isolation hole (5) is provided between the two inner layer grooves, and the magnetic isolation hole (5) and the two inner layer grooves form a "V" or "H" shaped magnetic isolation bridge (6).

9. A drive motor, characterized in that: Includes the rotor laminations as described in any one of claims 1-7.

10. A vehicle, characterized in that: Includes the drive motor as described in claim 9.

Images