Adjustable power density type permanent magnet auxiliary synchronous reluctance motor rotor punching sheet
By designing the rotor punching plate of the adjustable power density permanent magnet assisted synchronous magnet reluctance motor, the use of rare earth magnet steel is flexibly adjusted, and the problem of high production cost of rare earth permanent magnet motors is solved, and the flexible adaptability and resource saving of motor performance is achieved.
Patent Information
- Application Number
- CN202422364342.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-09-27
AI Technical Summary
The use of rare earth magnet steel for the existing rare earth permanent magnet assisted synchronous reluctance motor is fixed, resulting in high production costs and difficult to adapt to different performance requirements. The non-renewable rare earth resources and price fluctuations affect the promotion.
A rotor punching sheet of a permanent magnet assisted synchronous magnetoresistive reluctance motor is designed. The structure is equipped with six sets of punching grooves, each group consisting of three U-shaped magnetic steel grooves. By adjusting the number and position of the magnetic steel, the amount of rare earth magnetic steel is flexibly adjusted to meet different performance needs.
It has achieved the reduction of the amount of rare earth magnet under the same performance, reduced production costs, adapted to different motor performance requirements, and saved rare earth resources.
Smart Images
Figure CN223194478U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a structure of a motor rotor punching sheet, in particular to a punching sheet structure of an adjustable power density type rare earth permanent magnet assisted synchronous reluctance motor. Background Art
[0002] Under the guidance of the energy conservation and emission reduction policy, with the popularization of electronic power equipment and the maturity of rare earth applications, the market acceptance of high-efficiency permanent magnet motors is gradually increasing. Currently, the high-efficiency permanent magnet motors produced and sold on the market generally use rare earth magnetic steels as the main component. However, as a non-renewable resource, rare earth resources have the problems of irreversibility and high cost. On the other hand, the price of rare earth fluctuates greatly with the market, resulting in certain difficulties in promoting rare earth permanent magnet motors in some occasions.
[0003] In the existing technology, the amount of rare earth magnetic steel used in the rotor punching sheet of a rare earth permanent magnet assisted synchronous reluctance motor is generally fixed. Because the slot type of the rotor punching sheet is fixed, for motors with different performance requirements, rotor punching sheets with different slot types need to be designed, resulting in higher production costs. Summary of the Utility Model
[0004] The adjustable power density type permanent magnet assisted synchronous reluctance motor rotor punching sheet proposed by the utility model aims to overcome the above-mentioned deficiencies existing in the prior art and realize the switching of the amount of rare earth magnetic steel according to different performance requirements of the motor, thereby reducing the cost of the motor.
[0005] The technical solution of the utility model: An adjustable power density type permanent magnet assisted synchronous reluctance motor rotor punching sheet, the structure of which includes a rotor punching sheet body. Six groups of identical and circumferentially arrayed punching sheet slot types are provided on the rotor punching sheet body. Each group of punching sheet slot types consists of three first magnet slots, three second magnet slots, and three third magnet slots. In each group of punching sheet slot types, the three first magnet slots are arranged at intervals, the three second magnet slots are arranged at intervals, and the three third magnet slots are arranged at intervals. In each group of punching sheet slot types, the three first magnet slots are U-shaped, the three second magnet slots are U-shaped, and the three third magnet slots are U-shaped. The U-shaped first magnet slots, second magnet slots, and third magnet slots are arranged parallel to each other at intervals. Rare earth magnetic steel is placed or not placed in the three first magnet slots, three second magnet slots, and three third magnet slots in each group of punching sheet slot types. With different numbers and positions of permanent magnets placed, the ratio between the permanent magnet torque and the reluctance torque of the motor can be adjusted, and the amount of permanent magnet used can be reduced under the same performance conditions.
[0006] Preferably, the positions and quantities of the rare earth magnetic steel placed in each group of the punching sheet slot types are the same.
[0007] Or, preferably, the positions and quantities of the rare earth magnetic steel placed in each group of the punching sheet slot types are different. The performance of the motor can be further flexibly adjusted.
[0008] Preferably, the ratio of the distance between adjacent first magnet slots and the distance between adjacent second magnet slots is 0.725.
[0009] Preferably, a punching shaft hole is provided at the center of the rotor punching sheet body, and a pair of axially extending and oppositely arranged positioning key grooves are provided in the punching shaft hole, and the connection line of the two positioning key grooves passes through the center of the punching shaft hole.
[0010] Advantages of the present utility model: The structure is reasonably designed, enabling the switching of the rare earth magnet usage according to the motor performance requirements. With a single set of rotor punching sheet groove types, it can be adapted to motors with different performance requirements, effectively saving and reducing the usage of rare earth magnets, and reducing the production cost of the motor. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 is a schematic structural view of a rotor punching sheet of an adjustable power density type permanent magnet assisted synchronous reluctance motor of the present utility model.
[0012] In the figure, 1 is the first magnet slot, 2 is the second magnet slot, 3 is the third magnet slot, 4 is the punching shaft hole, 5 is the positioning key groove, a is the distance between adjacent first magnet slots and the second magnet slot, and b is the distance between adjacent second magnet slots and the third magnet slot. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0013] The present utility model will be further described in detail below with reference to the embodiments and specific implementation manners.
[0014] As Figure 1 shown, an adjustable power density type permanent magnet assisted synchronous reluctance motor rotor punching sheet has a structure including a rotor punching sheet body. A punching shaft hole 4 is provided at the center of the rotor punching sheet body, and a pair of axially extending and oppositely arranged positioning key grooves 5 are provided in the punching shaft hole 4, and the connection line of the two positioning key grooves 5 passes through the center of the punching shaft hole 4.
[0015] Six groups of identical and circumferentially arrayed punching sheet groove types are provided on the rotor punching sheet body. Each group of punching sheet groove types consists of three first magnet slots 1, three second magnet slots 2, and three third magnet slots 3. In each group of punching sheet groove types, the three first magnet slots 1 are spaced apart, the three second magnet slots 2 are spaced apart, and the three third magnet slots 3 are spaced apart. In each group of punching sheet groove types, the three first magnet slots 1 are U-shaped, the three second magnet slots 2 are U-shaped, and the three third magnet slots 3 are U-shaped. The U-shaped first magnet slots 1, second magnet slots 2, and third magnet slots 3 are arranged parallel to each other and spaced apart, and the ratio of the distance a between adjacent first magnet slots and the second magnet slot to the distance b between adjacent second magnet slots and the third magnet slot is 0.725.
[0016] In each set of punching sheet groove types, rare earth magnets can be placed or not placed in the three first magnet grooves 1, the three second magnet grooves 2, and the three third magnet grooves 3. The positions and quantities of the rare earth magnets placed in each set of punching sheet groove types can be the same or different.
[0017] According to the above structure, the rotor punching sheet body is laminated on the motor shaft by using the positioning key groove 5 and the punching sheet shaft hole 4, ensuring that the first magnet groove 1, the second magnet groove 2, and the third magnet groove 3 on the punching sheet are neat and flat. According to the performance requirements of the motor, permanent magnets (rare earth magnets) can be selectively placed in the first magnet groove 1, the second magnet groove 2, and the third magnet groove 3, or permanent magnets can be selectively placed in the three magnet grooves in the U-shaped direction of the three groups of magnet grooves of the first magnet groove 1, the second magnet groove 2, and the third magnet groove 3, so as to adjust the power density of the motor.
[0018] With different quantities and positions of the permanent magnets placed, the ratio between the permanent magnet torque and the reluctance torque of the motor can be adjusted, reducing the usage of permanent magnets under the same performance conditions.
[0019] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the creative concept of the present invention, several modifications and improvements can be made, and these all belong to the protection scope of the present invention.
Claims
1. A rotor lamination for a permanent magnet assisted synchronous reluctance motor with adjustable power density, characterized in that: The invention comprises a rotor punching body, on which six groups of identical punching slots distributed in a circumferential array are provided, each group of punching slots consisting of three first magnetic steel slots (1), three second magnetic steel slots (2) and three third magnetic steel slots (3), in each group of punching slots, the three first magnetic steel slots (1) are arranged at intervals, the three second magnetic steel slots (2) are arranged at intervals, and the three third magnetic steel slots (3) are arranged at intervals, in each group of punching slots, the three first magnetic steel slots (1) are U-shaped, the three second magnetic steel slots (2) are U-shaped, and the three third magnetic steel slots (3) are U-shaped, the U-shaped first magnetic steel slots (1), the second magnetic steel slots (2) and the third magnetic steel slots (3) are arranged parallel to each other at intervals, and rare earth magnets are placed or not placed in the three first magnetic steel slots (1), the three second magnetic steel slots (2) and the three third magnetic steel slots (3) in each group of punching slots.
2. The adjustable power density permanent magnet assisted synchronous reluctance motor rotor lamination according to claim 1, characterized in that: The positions and quantities of the rare earth magnets placed in the punching slots of each group are the same.
3. The adjustable power density permanent magnet assisted synchronous reluctance motor rotor punching according to claim 1, characterized in that: The positions and quantities of rare earth magnets placed in the punching slots of each group are different.
4. The rotor lamination of a permanent magnet assisted synchronous reluctance motor with adjustable power density according to any one of claims 1 to 3, characterized in that: The ratio of the distance between the adjacent first magnetic steel slots and the second magnetic steel slots (a) to the distance between the adjacent second magnetic steel slots and the third magnetic steel slots (b) is 0.
725.
5. The rotor lamination of a permanent magnet assisted synchronous reluctance motor with adjustable power density according to any one of claims 1 to 3, characterized in that A punching shaft hole (4) is provided at the center of the rotor punching body. A pair of axially extending and oppositely arranged positioning key slots (5) are provided in the punching shaft hole (4). The connecting line of the two positioning key slots (5) passes through the center of the punching shaft hole (4).