Permanent magnet motor rotor with radial and axial magnetism gathering characteristics

Abstract

The invention discloses a permanent magnet motor rotor with radial and axial magnetism gathering characteristics. The permanent magnet motor rotor comprises a motor shaft, a radial permanent magnet array, a radial magnet yoke array, an axial permanent magnet array and an axial back yoke. The radial permanent magnet array comprises a plurality of first permanent magnets, the first permanent magnetsare distributed on the outer cylindrical surface of the motor shaft in a circumferential array mode, each first permanent magnet is magnetized tangentially, and the magnetizing directions of every two adjacent first permanent magnets are opposite; the radial magnet yoke array comprises a plurality of cylindrical magnet yokes, and the first permanent magnet is embedded between two adjacent cylindrical magnet yokes; and the axial permanent magnet array comprises a plurality of second permanent magnets magnetized in the axial direction, and the magnetizing directions of every two adjacent secondpermanent magnets are opposite. The magnetizing directions of the first permanent magnet and the second permanent magnet which are magnetized in the tangential direction and the axial direction are opposite, axial end magnetic flux leakage is restrained, a radial and axial mixed magnetic gathering magnetic circuit is formed, and the air gap flux density is increased.

Description

technical field [0001] The invention belongs to the technical field of motors, in particular to a permanent magnet motor rotor with radial and axial magnetic concentration characteristics. Background technique [0002] Permanent magnet motors have high torque density and high efficiency, and are widely used in electric vehicles, wind power generation, aerospace and other occasions. Since the permanent magnet of the built-in permanent magnet motor is placed inside the rotor core, the safety of the rotor can still be guaranteed when the rotor runs at high speed. In addition, permanent magnets are inserted into the rotor core of the built-in permanent magnet motor, and the shape of the permanent magnet can be designed according to different performance requirements to effectively use the space of the rotor core. However, the built-in permanent magnet motor in the prior art has magnetic flux leakage in its core structure, resulting in a partial waste of magnetic performance, su...

AI Technical Summary

Problems solved by technology

Although the two patented solutions form a mixed magnetic circuit to improve the torque quality, they both complicate the structure of the motor, and the two sets of windings increase the copper loss and reduce the efficiency.

Images