Rotor punching sheet, rotor core and motor
By setting hole-shaped speed-increasing parts on the rotor punchings, the rotor strength and magnet heat dissipation problems of new energy vehicle motors in high power density and high speed designs are solved, the peak speed and cooling effect of the motor are improved, and the material and manufacturing costs are reduced.
Patent Information
- Application Number
- CN202422502207.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-16
- Publication Date
- 2025-10-10
- Estimated Expiration
- 2034-10-16
AI Technical Summary
In the high power density and high speed design of new energy vehicle motors, rotor strength and magnetic heat dissipation become challenges. Existing technical solutions have problems such as increased material costs, complex processes or reduced performance.
A speed-increasing member is provided on the rotor punching. The speed-increasing member is a hole-shaped structure used to increase the peak speed of the motor and to form a rotor core by stacking, thereby reducing weight and manufacturing costs, while optimizing the cooling effect of the magnetic steel.
It achieves the goal of increasing the peak speed of the motor within the high speed range, reducing the stress of the magnetic isolation bridge, reducing magnetic leakage, ensuring the performance of the motor, and reducing material and manufacturing costs.
Smart Images
Figure CN223428223U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to motor technical field, especially a rotor punching sheet, rotor core and motor. BACKGROUND
[0002] Now new energy automobile motor tends to high power density and high speed design, and this brings risk and challenge to the strength of rotor and magnetic steel heat dissipation. The prior art generally solves the strength risk through the following schemes: 1) directly using high-strength silicon steel sheet to improve the peak speed of rotor, the advantage is that design and manufacture are simple, and the disadvantage is that special material is needed to increase cost; 2) greatly increasing the thickness of the magnetic bridge to optimize the strength performance, the advantage is that ordinary silicon steel sheet is used without increasing cost, and the disadvantage is that serious magnetic leakage causes performance decline; 3) using carbon fiber binding technology, the advantage is that the peak speed can be greatly improved, and the disadvantage is that the process is complex, and the design and manufacturing cost is increased. CONTENT OF UTILITY MODEL
[0003] The utility model aims at providing a rotor punching sheet, rotor core and motor to solve the problems of rotor strength and magnetic steel heat dissipation in the process of high power density and high speed design of new energy automobile motor.
[0004] In a first aspect, the utility model provides a rotor punching sheet for being stacked to form a rotor core of a permanent magnet motor, comprising:
[0005] First magnetic steel slot, the first magnetic steel slot includes two, two the first magnetic steel slot is arranged in V type, two the V type opening formed by the first magnetic steel slot is towards the circumferential direction of the rotor punching sheet;
[0006] Second magnetic steel slot, the second magnetic steel slot includes two, two the second magnetic steel slot is arranged in V type, two the V type opening formed by the second magnetic steel slot is towards the circumferential direction of the rotor punching sheet, two the first magnetic steel slot is located in the V type opening formed by the second magnetic steel slot;
[0007] Speed increasing part, the speed increasing part is located in the V type opening formed by the second magnetic steel slot, between two the first magnetic steel slot and two the second magnetic steel slot, the speed increasing part is used to improve the peak speed of the permanent magnet motor.
[0008] The rotor punching sheet as described above, preferably, the speed increasing part is the hole structure through the rotor punching sheet.
[0009] A rotor punching as described above, wherein, preferably, the ends of the two first magnetic steel slots close to each other form a first magnetic isolation bridge, the ends of the two second magnetic steel slots close to each other form a second magnetic isolation bridge, and the speed increasing parts are an even number, and the even number of the speed increasing parts are symmetrically arranged along the line between the first magnetic isolation bridge and the second magnetic isolation bridge.
[0010] In the rotor punching as described above, preferably, the number of the speed increasing members is two, four or six.
[0011] In the rotor punching as described above, preferably, the speed increasing member is an inverted triangular through hole.
[0012] In the rotor punching as described above, preferably, the bottom edge of the speed increasing member close to the first magnetic steel slot is parallel to the edge line of the first magnetic steel slot away from the circumference of the rotor punching.
[0013] In the rotor punching as described above, preferably, the areas of the plurality of speed increasing members decrease gradually along a direction away from a line connecting the first magnetic isolation bridge and the second magnetic isolation bridge.
[0014] In the rotor punching as described above, preferably, the angle between the two first magnetic steel slots is greater than the angle between the two second magnetic steel slots.
[0015] In a second aspect, the present invention provides a rotor core formed by stacking the aforementioned rotor punchings.
[0016] In a third aspect, the present invention provides a motor comprising the aforementioned rotor core.
[0017] Compared with the prior art, the rotor punching of the utility model is provided with a speed-increasing member between the first magnetic steel slot and the second magnetic steel slot. The speed-increasing member can greatly increase the peak speed of the motor and ensure that the magnetic leakage coefficient of the motor does not increase. It also has the effect of cooling the magnetic steel, the processing technology is simple, and the manufacturing cost is low. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a schematic structural diagram of a rotor punching provided in an embodiment of the present utility model.
[0019] Description of reference numerals:
[0020] 100- rotor punching;
[0021] 10-first magnetic steel slot, 11-first magnetic isolation bridge;
[0022] 20-second magnetic steel slot, 21-second magnetic isolation bridge;
[0023] 30-speed increaser. DETAILED DESCRIPTION
[0024] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.
[0025] In a first aspect, the present invention provides a rotor punching 100 for forming a rotor core of a permanent magnet motor by stacking. The rotor punching 100 includes a first magnetic steel slot 10, a second magnetic steel slot 20, and a speed increasing member 30, wherein:
[0026] Reference Figure 1 As shown, the rotor punching 100 is fan-shaped, and includes two first magnetic steel slots 10 . The two first magnetic steel slots 10 are arranged in a V-shape, and the V-shaped opening formed by the two first magnetic steel slots 10 faces the circumferential direction of the rotor punching 100 .
[0027] The second magnetic steel slots 20 include two, and the two second magnetic steel slots 20 are arranged in a V-shape. The V-shaped opening formed by the two second magnetic steel slots 20 faces the circumferential direction of the rotor punching 100. The two first magnetic steel slots 10 are located in the V-shaped opening formed by the two second magnetic steel slots 20. Compared with the two first magnetic steel slots 10, the two second magnetic steel slots 20 are farther away from the circumference of the rotor punching 100.
[0028] The speed increasing member 30 is arranged in the V-shaped opening of the two second magnetic steel slots 20, and is located between the two first magnetic steel slots 10 and the two second magnetic steel slots 20. When the rotor core formed by stacking the rotor punchings 100 is set in the motor, the motor can reach a higher speed range through the joint action of multiple speed increasing members 30, thereby increasing the peak speed of the motor.
[0029] In the embodiment provided in this application, the speed increasing member 30 is a hole-shaped structure that penetrates the rotor punching 100. The speed increasing member 30 with a hole-shaped structure can, on the one hand, increase the peak speed of the motor, and on the other hand, can be used as a weight-reducing hole on the rotor punching 100 to reduce the weight of the rotor punching 100, thereby helping to reduce manufacturing costs. Figure 1 As shown, the ends of the two first magnetic steel slots 10 that are away from each other are close to the circumference of the rotor punching 100, and the ends that are close to each other are away from the circumference of the rotor punching 100, thereby forming a V-shaped arrangement. There is a gap between the ends of the two first magnetic steel slots 10 that are close to each other, and this gap is the first magnetic isolation bridge 11. The two second magnetic steel slots 20 form a V-shaped structure in the same manner. There is also a gap between the ends of the two second magnetic steel slots 20 that are close to each other, and this gap is the second magnetic isolation bridge 21. In order to achieve the speed-increasing effect of the speed-increasing member 30, an even number of speed-increasing members 30 are set, and the even number of speed-increasing members 30 are symmetrically arranged along the line connecting the first magnetic isolation bridge 11 and the second magnetic isolation bridge 21, so as to stabilize the peak speed of the motor after speeding up.
[0030] In one feasible embodiment, the number of speed-increasing members 30 can be two, four, or six, with one, two, or three speed-increasing members 30 respectively provided on both sides of the line connecting the first magnetic isolation bridge 11 and the second magnetic isolation bridge 21. The number of speed-increasing members 30 can be selected and set based on the peak speed of the motor and the structure of the rotor punching 100 after calculation, and is not limited here.
[0031] In the embodiment provided in this application, the speed increasing member 30 is an inverted triangular through hole. Figure 1 As shown, one vertex of the triangular through hole is close to the second magnetic steel slot 20, and the other two vertices are close to the first magnetic steel slot 10, and the base connecting these two vertices is parallel to the edge line of the first magnetic steel slot 10 away from the circumference of the rotor punching 100. Based on the fan-shaped structure of the rotor punching 100 of the present application, when the number of speed increasers 30 exceeds two, the area of the multiple speed increasers 30 gradually decreases in the direction away from the center line, with the line connecting the first magnetic isolation bridge 11 and the second magnetic isolation bridge 21 as the center line. Therefore, the positions of the multiple speed increasers 30 are reasonably arranged on the rotor punching 100 while achieving the function of the speed increasers 30.
[0032] Reference Figure 1 As shown, the angle between the two first magnetic steel slots 10 is greater than the angle between the two second magnetic steel slots 20, so that after the first magnetic steel slots 10 and the second magnetic steel slots 20 are installed with magnetic steel, the radial electromagnetic force and the tangential electromagnetic force and their harmonic components are small, and the torque fluctuation is small, which is beneficial to improving the motor efficiency and NVH performance.
[0033] Secondly, the present invention provides a rotor core formed by stacking the aforementioned rotor sheets 100. Because the rotor sheets 100 have a hole-like speed-increasing member 30, stacking multiple rotor sheets 100 to form the rotor core significantly reduces the weight of the rotor core, saving manufacturing costs while also facilitating an increase in the peak speed of the motor.
[0034] Thirdly, the present invention provides a motor comprising the aforementioned rotor core. Because the rotor core is formed by laminating rotor laminations 100 with speed-increasing members 30 having a hole-like structure, a motor equipped with this rotor core can operate within a higher speed range, with the peak speed being increased by 1000-2000 rpm. Alternatively, at the same peak speed, the stress at the root of the magnetic isolation bridge can be reduced by 20-40 MPa, thereby reducing the rotor's strength risk at high speeds.
[0035] Compared with the traditional method of optimizing the motor strength by increasing the thickness of the magnetic isolation bridge, the motor of the present application has basically no increase in the magnetic leakage coefficient, thereby ensuring the output performance of the motor.
[0036] The motor is installed with a rotor core having a hole-shaped speed-increasing member 30. The hole-shaped structure can also pass through the rotor oil circuit, thereby further improving the cooling effect of the magnetic steel (compared with the rotor punching 100 without a hole-shaped structure, the temperature of the magnetic steel is relatively reduced by 15-30°C). Under the premise of ensuring the anti-demagnetization ability of the motor, low coercive force magnetic steel can be selected to optimize the material cost of the magnetic steel.
[0037] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present invention, but the scope of implementation of the present invention is not limited to what is shown in the drawings. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which do not exceed the spirit covered by the description and drawings, should be within the scope of protection of the present invention.
Claims
1. A rotor punching for forming a rotor core of a permanent magnet motor, characterized in that: include: First magnetic steel slots, including two first magnetic steel slots, the two first magnetic steel slots are arranged in a V-shape, and the V-shaped opening formed by the two first magnetic steel slots faces the circumferential direction of the rotor punching; second magnetic steel slots, comprising two second magnetic steel slots, the two second magnetic steel slots being arranged in a V-shape, the V-shaped opening formed by the two second magnetic steel slots facing the circumferential direction of the rotor punching, and the two first magnetic steel slots being located within the V-shaped opening formed by the two second magnetic steel slots; A speed-increasing member is provided in a V-shaped opening formed by the two second magnetic steel slots and is located between the two first magnetic steel slots and the two second magnetic steel slots, and is used to increase the peak speed of the permanent magnet motor; The speed increasing member is a hole-shaped structure that passes through the rotor punching.
2. The rotor punching according to claim 1, characterized in that: The ends of the two first magnetic steel slots that are close to each other form a first magnetic isolation bridge, and the ends of the two second magnetic steel slots that are close to each other form a second magnetic isolation bridge. The speed increasing parts are an even number, and the even number of speed increasing parts are symmetrically arranged along the line between the first magnetic isolation bridge and the second magnetic isolation bridge.
3. The rotor punching according to claim 2, characterized in that: The number of the speed increasing members is two, four or six.
4. The rotor punching according to claim 3, characterized in that: The speed increasing member is an inverted triangular through hole.
5. The rotor punching according to claim 4, characterized in that: The bottom edge of the speed increasing member close to the first magnetic steel slot is parallel to the edge line of the first magnetic steel slot away from the circumference of the rotor punching sheet.
6. The rotor punching according to claim 5, characterized in that: Along a direction away from a line connecting the first magnetic isolation bridge and the second magnetic isolation bridge, areas of the plurality of speed increasing members decrease gradually.
7. The rotor punching according to claim 1, characterized in that: The included angle between the two first magnetic steel slots is greater than the included angle between the two second magnetic steel slots.
8. A rotor core, characterized in that: The rotor is formed by stacking the rotor sheets according to any one of claims 1 to 7.
9. A motor, characterized in that: Comprising the rotor core according to claim 8.