High-power-density rotor punching sheet structure, motor and vehicle

Abstract

The utility model discloses a high power density rotor punching sheet structure, a motor and a vehicle, the high power density rotor punching sheet structure 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 a first magnetic steel groove group, a second magnetic steel groove group and a third magnetic steel groove group, the first magnetic steel groove group, the second magnetic steel groove group and the third magnetic steel groove group are sequentially arranged from outside to inside in the radial direction of the punching sheet body; the first magnetic steel groove group is V-shaped or linear, and the second magnetic steel groove group and the third magnetic steel groove group are both V-shaped. According to the utility model, the output power can be effectively improved in a full rotating speed section, and the performance of outputting higher torque power with smaller weight and volume and lower material cost is achieved.

Description

Technical Field

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

[0002] As the core of new energy vehicles, the drive motor system is increasingly focused on lightweight design as technology advances. For the entire vehicle, a compact drive motor that is lighter while maintaining advanced performance significantly enhances product competitiveness. Currently, most permanent magnet rotor components in drive motors utilize single-layer magnets (including single "V" type and single "I" type) and double-layer magnets (including "V+I" type, double "V" type, and "U+I" type). Under the same input voltage and current, the output power of these five types of permanent magnet rotors is limited by the rotor structure and magnet arrangement, preventing them from reaching a power output closer to the theoretical maximum. A few structures, such as double-V, may increase output power by significantly increasing the amount of electromagnetic materials, but this leads to increased motor cost, size, and weight. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a high power density rotor lamination structure, motor and vehicle that can effectively improve output power across the entire speed range, achieving higher torque power performance with smaller weight, volume and lower material cost.

[0004] This utility model discloses a high power density rotor lamination structure, including a lamination body. The lamination body is provided with multiple magnetic pole units along the circumferential direction. Each magnetic pole unit is provided with a first magnetic slot group, a second magnetic slot group, and a third magnetic slot group. In the radial direction of the lamination body, the first magnetic slot group, the second magnetic slot group, and the third magnetic slot group are arranged sequentially from the outside to the inside. The first magnetic slot group is V-shaped or I-shaped, and the second and third magnetic slot groups are both V-shaped.

[0005] Furthermore, the number of magnetic pole units is N; the lamination body has a center, the angle between the two endpoints of the first magnetic slot group on the circumferential direction of the lamination body and the center is α, the angle between the two endpoints of the second magnetic slot group on the circumferential direction of the lamination body and the center is β, and the angle between the two endpoints of the third magnetic slot group on the circumferential direction of the lamination body and the center is γ; wherein,

[0006] Furthermore, when the first magnet trough group is in the shape of an "I" line, its included angle is 180°; when the first magnet trough group is in the shape of a "V" line, its included angle of the V is φ1; wherein, 150°≤φ1<180°.

[0007] Furthermore, the included angle of the V-shape of the second magnet slot group is φ2; wherein, 120°≤φ2≤150°.

[0008] Furthermore, the V-shaped included angle of the third magnet slot group is φ3; wherein, 80°≤φ3≤120°.

[0009] Furthermore, the first magnetic steel trough group includes two first magnetic steel troughs, and each of the two first magnetic steel troughs is provided with a permanent magnet. A "I"-shaped magnetic isolation bridge is provided between the two first magnetic steel troughs, or no magnetic isolation bridge is provided between the two first magnetic steel troughs.

[0010] Furthermore, the second magnetic steel trough assembly includes two second magnetic steel troughs, and each of the two second magnetic steel troughs is provided with a permanent magnet, and a magnetic isolation bridge in the shape of an "I" or a "V" is provided between the two second magnetic steel troughs.

[0011] Furthermore, the third magnet slot group includes two third magnet slots, and each of the two third magnet slots is provided with a permanent magnet, and a "I"-shaped or "Eight"-shaped magnetic isolation bridge is provided between the two third magnet slots.

[0012] One type of motor in this invention includes the aforementioned high power density rotor lamination structure.

[0013] One type of vehicle according to this utility model includes the aforementioned motor.

[0014] The beneficial effects of this utility model are as follows: The magnets of the rotor laminations of this utility model are arranged in three layers (two "V" shapes + one "I" shape, or three "V" shapes). Under the same size parameters, the three-layer magnet arrangement can make full use of the rotor space, greatly increase the magnetic flux area, reduce the problem of limited output power caused by rotor magnetic circuit saturation due to other magnet arrangement technologies, and increase the proportion of reluctance torque and permanent magnet torque. Thus, the output power is effectively improved across the entire speed range, achieving higher torque power performance with smaller weight, volume and lower material cost. Attached Figure Description

[0015] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the following drawings are provided for illustration:

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2This is a schematic diagram showing the positions of the included angles α, β, and γ of this utility model;

[0018] Figure 3 This is a schematic diagram showing the positions of the included angles φ1, φ2, and φ3 of this utility model.

[0019] The following labels are used in the attached diagram: 1-First magnet slot group, 2-Second magnet slot group, 3-Third magnet slot group, 4-Permanent magnet. Detailed Implementation

[0020] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0021] like Figures 1-3 As shown, a high power density rotor lamination structure in this embodiment includes a lamination body. The lamination body is provided with multiple magnetic pole units along the circumferential direction. Each magnetic pole unit is provided with a first magnetic slot group 1, a second magnetic slot group 2, and a third magnetic slot group 3. In the radial direction of the lamination body, the first magnetic slot group 1, the second magnetic slot group 2, and the third magnetic slot group 3 are arranged sequentially from the outside to the inside. The first magnetic slot group 1 is V-shaped or I-shaped, and the second magnetic slot group 2 and the third magnetic slot group 3 are both V-shaped.

[0022] In this embodiment, the rotor laminations employ a three-layer magnet arrangement (two "V" shapes + one "I" shape, or three "V" shapes). Under the same dimensional parameters, this three-layer magnet arrangement fully utilizes the rotor space, significantly increases the magnetic flux area, reduces the output power limitation caused by rotor magnetic circuit saturation due to other magnet arrangement techniques, and increases the ratio of reluctance torque to permanent magnet torque. This effectively improves output power across the entire speed range, achieving higher torque and power performance with smaller weight, volume, and lower material costs. Under the premise of simulating the same output power, compared to traditional double-V and other structures, the rotor stack height in this embodiment is reduced by at least 5%, and the amount of magnets used is reduced by at least 10%, making it particularly suitable for applications with limited motor installation space and high output performance requirements.

[0023] In this embodiment, the number of magnetic pole units is N; the lamination body has a center, the two endpoints of the first magnetic slot group 1 in the circumferential direction of the lamination body form an angle α with the center, the two endpoints of the second magnetic slot group 2 in the circumferential direction of the lamination body form an angle β with the center, and the two endpoints of the third magnetic slot group 3 in the circumferential direction of the lamination body form an angle γ with the center; wherein, N can be 8, where 9°≤α≤18°, 20.25°≤β≤31.5°, and 33.75°≤γ≤40.5°. In this case, the motor has a better pole arc coefficient, which allows for a more reasonable distribution of magnetic flow, improves the back EMF waveform, and reduces harmonic content.

[0024] The angle α between the two endpoints of the first magnet slot group 1 in the circumferential direction of the lamination body and the center of the circle refers to: Figure 2 In the middle, the center of the lamination body is point O, and the angle between the line connecting the left end point A of the first magnet slot group 1 and the center O and the line connecting the right end point B of the first magnet slot group 1 and the center O is α.

[0025] The angle β between the two endpoints of the second magnet slot group 2 in the circumferential direction of the lamination body and the center of the circle refers to: Figure 2 In the middle, the center of the lamination body is point O, and the angle between the line connecting the left end point C of the second magnet slot group 2 and the center O and the line connecting the right end point D of the second magnet slot group 2 and the center O is β.

[0026] The angle γ between the two endpoints of the third magnet slot group 3 in the circumferential direction of the lamination body and the center of the circle refers to: Figure 2 In the middle, the center of the lamination body is point O, and the angle between the line connecting the left endpoint E of the third magnet groove group 3 and the center O and the line connecting the right endpoint F of the third magnet groove group 3 and the center O is γ.

[0027] In this embodiment, when the first magnet slot group 1 is in a straight line shape, its included angle is 180°; when the first magnet slot group 1 is in a V-shape, its included angle is φ1; wherein, 150°≤φ1<180°. For example, φ1 can be 150°, 160°, 170°, 177°, etc. In this embodiment, the included angle of the second magnet slot group 2 is φ2; wherein, 120°≤φ2≤150°. For example, φ2 can be 120°, 130°, 140°, 145°, etc. In this embodiment, the included angle of the third magnet slot group 3 is φ3; wherein, 80°≤φ3≤120°. For example, φ3 can be 80°, 90°, 100°, 110°, 120°, etc. By reasonably setting the included angles of the three magnet slots, the rotor space utilization rate can be further improved.

[0028] In this embodiment, the first magnet slot group 1 includes two first magnet slots, and a permanent magnet 4 is respectively provided in the two first magnet slots. A "I"-shaped magnetic isolation bridge is provided between the two first magnet slots, or no magnetic isolation bridge is provided between the two first magnet slots. Figure 1 In the middle section, no magnetic isolation bridge is set between the two first magnet slots.

[0029] In this embodiment, the second magnetic steel groove group 2 includes two second magnetic steel grooves, and a permanent magnet 4 is respectively arranged in the two second magnetic steel grooves. A "I"-shaped or "Eight"-shaped magnetic isolation bridge is arranged between the two second magnetic steel grooves. Figure 1 A “I”-shaped magnetic isolation bridge is set between the two second magnetic steel slots.

[0030] In this embodiment, the third magnet slot group 3 includes two third magnet slots, and a permanent magnet 4 is respectively provided in each of the two third magnet slots. A magnetic isolation bridge in the shape of an "I" or a "V" is provided between the two third magnet slots. Figure 1 A “I”-shaped magnetic isolation bridge is set between the two third magnetic steel slots in the middle.

[0031] One type of motor in this embodiment includes the high power density rotor lamination structure described above.

[0032] One vehicle in this embodiment includes the aforementioned motor.

[0033] 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 high power density rotor lamination structure, characterized in that: It includes a punching sheet body, and a plurality of magnetic pole units are arranged on the punching sheet body along the circumferential direction. A first magnet groove group (1), a second magnet groove group (2), and a third magnet groove group (3) are arranged on each of the magnetic pole units. In the radial direction of the punching sheet body, the first magnet groove group (1), the second magnet groove group (2), and the third magnet groove group (3) are arranged in sequence from outside to inside; the first magnet groove group (1) is in a "V" shape or a "one" shape, and the second magnet groove group (2) and the third magnet groove group (3) are both in a "V" shape.

2. The high power density rotor lamination structure according to claim 1, characterized in that: The number of magnetic pole units is N; the lamination body has a center, the two endpoints of the first magnetic slot group (1) on the circumferential direction of the lamination body form an angle α with the center, the two endpoints of the second magnetic slot group (2) on the circumferential direction of the lamination body form an angle β with the center, and the two endpoints of the third magnetic slot group (3) on the circumferential direction of the lamination body form an angle γ with the center; wherein, , .

3. The high power density rotor lamination structure according to claim 1 or 2, characterized in that: When the first magnet groove group (1) is in a "one" shape, its included angle is 180°; when the first magnet groove group (1) is in a "V" shape, its V-shaped included angle is φ1; where 150° ≤ φ1 < 180.

4. The high power density rotor lamination structure according to claim 3, characterized in that: The V-shaped included angle of the second magnet groove group (2) is φ2; where 120° ≤ φ2 ≤ 150°.

5. The high power density rotor lamination structure according to claim 4, characterized in that: The V-shaped included angle of the third magnet groove group (3) is φ3; where 80° ≤ φ3 ≤ 120°.

6. The high power density rotor lamination structure according to claim 1, characterized in that: The first magnet groove group (1) includes two first magnet grooves, and a permanent magnet (4) is respectively arranged in each of the two first magnet grooves. A "one" shaped magnetic isolation bridge is arranged between the two first magnet grooves or no magnetic isolation bridge is arranged between the two first magnet grooves.

7. The high power density rotor lamination structure according to claim 6, characterized in that: The second magnet groove group (2) includes two second magnet grooves, and a permanent magnet (4) is respectively arranged in each of the two second magnet grooves. A "one" shaped or "eight" shaped magnetic isolation bridge is arranged between the two second magnet grooves.

8. The high power density rotor lamination structure according to claim 7, characterized in that: The third magnet groove group (3) includes two third magnet grooves, and a permanent magnet (4) is respectively arranged in each of the two third magnet grooves. A "one" shaped or "eight" shaped magnetic isolation bridge is arranged between the two third magnet grooves.

9. An electric motor, characterized in that: It includes the high-power density rotor punching sheet structure according to any one of claims 1-8.

10. A vehicle, characterized in that: It includes the motor according to claim 9.

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