CN-224218165-U - Reinforced built-in permanent magnet motor rotor structure and driving motor

Abstract

The application discloses a reinforced built-in permanent magnet motor rotor structure which comprises a rotor iron core, a plurality of groups of first permanent magnets, second permanent magnets and reinforcing ribs, wherein each group of first permanent magnets and second permanent magnets are arranged on the rotor iron core, one reinforcing rib is arranged between each group of first permanent magnets and each group of second permanent magnets, and the polarities of the first permanent magnets and the second permanent magnets on two sides of the reinforcing rib are the same. The application can solve the problems that the traditional method for increasing the thickness of the magnetism isolating bridge to improve the reliability of the rotor can cause the magnetic leakage to become large, the utilization rate of the permanent magnet is reduced, and the power density of the motor is not obviously improved.

Inventors

• Gan Baoping
• GONG ZUO
• ZHAO YOUKUN
• LI JI

Assignees

• 西安微电机研究所有限公司

Dates

Publication Date

20260508

Application Date

20250411

Claims (10)

1. 1. The reinforced built-in permanent magnet motor rotor structure is characterized by comprising a rotor core (1), a plurality of groups of first permanent magnets (2), second permanent magnets (3) and reinforcing ribs (4); Each group of first permanent magnets (2) and second permanent magnets (3) are arranged on the rotor core (1), a reinforcing rib (4) is arranged between each group of first permanent magnets (2) and the second permanent magnets (3), and the polarities of the first permanent magnets (2) and the second permanent magnets (3) on two sides of the reinforcing rib (4) are the same.
2. 2. The reinforced interior permanent magnet motor rotor structure according to claim 1, wherein the rotor punching sheet on the rotor core (1) is provided with a caulking groove, and each group of the first permanent magnet (2) and the second permanent magnet (3) are inlaid in the caulking groove.
3. 3. The rotor structure of a reinforced permanent magnet motor according to claim 1, wherein each of the first permanent magnet (2) and the second permanent magnet (3) is arranged in any one of a straight shape, a V shape, a U shape, and a hybrid shape.
4. 4. The enhanced interior permanent magnet motor rotor structure of claim 1, further comprising at least one third permanent magnet disposed on: between the first permanent magnet (2) and the second permanent magnet (3), or, The side of the first permanent magnet (2) far away from the second permanent magnet (3), or, The second permanent magnet (3) is far away from one side of the first permanent magnet (2); The reinforcing ribs are respectively arranged between the adjacent first permanent magnet (2), second permanent magnet (3) and third permanent magnet.
5. 5. A reinforced permanent magnet motor rotor structure according to claim 1, wherein the reinforcing ribs (4) are shaped with two large ends and a small middle.
6. 6. The reinforced internal permanent magnet motor rotor structure according to claim 1, wherein the reinforcing ribs (4) are made of a non-magnetic conductive material, and the non-magnetic conductive material is high-strength stainless steel.
7. 7. The reinforced built-in permanent magnet motor rotor structure according to claim 1, wherein an anti-slip structure is arranged at the joint of the reinforcing rib (4) and the rotor core (1), and the anti-slip structure is a joint protrusion or a groove.
8. 8. The reinforced interior permanent magnet motor rotor structure according to claim 1, wherein the first permanent magnet (2) and the second permanent magnet (3) are provided with glue layers on the walls of the slots.
9. 9. The reinforced built-in permanent magnet motor rotor structure according to claim 1, wherein the rotor core (1) is formed by laminating a plurality of silicon steel sheets, and an insulating layer is arranged between adjacent silicon steel sheets.
10. 10. A drive motor comprising a reinforced interior permanent magnet motor rotor structure according to any one of claims 1-9.

Description

Reinforced built-in permanent magnet motor rotor structure and driving motor Technical Field The application belongs to the technical field of permanent magnet motors, and particularly relates to a reinforced built-in permanent magnet motor rotor structure and a driving motor. Background Permanent magnet synchronous motors are widely applied in the fields of electric automobiles, aerospace and the like due to the characteristics of high efficiency and high power density. The rotor topology of the permanent magnet motor is mainly divided into a surface-mounted type rotor and a built-in type rotor. The built-in rotor topology can generate reluctance torque due to unequal AC-DC axis inductances, so that the power density and the torque density of the motor are effectively increased, and the built-in rotor topology is particularly widely applied. However, the design of the in-rotor topology faces the dual challenges of strength and permanent magnet utilization. The strength design of the rotor is mainly dependent on the size of the magnetically isolated bridge. When the design of the width of the magnetic isolation bridge is larger, although the rotor stress can be reduced, the leakage flux is increased, and the utilization rate of the permanent magnet is affected. With the development of the permanent magnet motor to high voltage and high speed, the increase of the rotation speed of the rotor puts higher demands on the reliability of the rotor. The traditional method is to increase the thickness of the magnetism isolating bridge to improve the reliability of the rotor, but the problem of magnetism leakage is aggravated, so that the utilization rate of the magnetic steel is low, and the improvement of the power density of the motor is not obvious. In particular, finite element analysis shows that the maximum stress position of the rotor magnetic isolation bridge is the joint of two pieces of magnetic steel with the same pole. The design of the magnetic isolation bridge is wider, so that larger homopolar magnetic leakage is easy to generate. In order to solve this problem, a new rotor structure that can ensure the strength of the rotor and reduce the leakage magnetic flux needs to be proposed. Disclosure of utility model The embodiment of the application aims to provide a reinforced built-in permanent magnet motor rotor structure and a driving motor. The method for increasing the thickness of the magnetic isolation bridge to improve the reliability of the rotor solves the problems that the magnetic leakage is increased, the utilization rate of the permanent magnet is reduced, and the power density of the motor is not obviously improved. In order to achieve the above purpose, the application adopts the following technical scheme: In a first aspect, a reinforced interior permanent magnet motor rotor structure is provided, including a rotor core, a plurality of groups of first permanent magnets, second permanent magnets and reinforcing ribs; Each group of the first permanent magnet and the second permanent magnet are arranged on the rotor core, a reinforcing rib is arranged between each group of the first permanent magnet and the second permanent magnet, and the polarities of the first permanent magnet and the second permanent magnet on two sides of the reinforcing rib are the same. In one possible implementation manner, the rotor punching sheet on the rotor core is provided with a caulking groove, and each group of the first permanent magnet and the second permanent magnet are inlaid in the caulking groove. In one possible implementation manner, each group of the first permanent magnet and the second permanent magnet is arranged in any one of a straight shape, a V shape, a U shape or a mixed shape. In one possible implementation manner, the method further comprises at least one third permanent magnet, where the third permanent magnet is disposed on: Between the first permanent magnet and the second permanent magnet, or, The side of the first permanent magnet away from the second permanent magnet, or, And one side of the second permanent magnet, which is far away from the first permanent magnet. In one possible implementation, the reinforcing ribs are in the shape of large ends and small middle ends. In one possible implementation, the reinforcing ribs are made of a non-magnetic material, and the non-magnetic material is high-strength stainless steel. In one possible implementation manner, two ends of the reinforcing rib are in clamping connection with the rotor core, and when the rotor rotates, the two ends of the reinforcing rib tighten the rotor core. In one possible implementation manner, an anti-slip structure is arranged at the joint of the reinforcing rib and the rotor core, and the anti-slip structure is a joint protrusion or a groove. In one possible implementation, the first permanent magnet and the second permanent magnet are provided with glue layers on the walls of the slots. In one possible implementa