Stator-rotor double-permanent-magnet-type-vernier motor

Abstract

The invention discloses a stator-rotor double-permanent-magnet-type-vernier motor which comprises a stator (1) and a rotor (2) coaxial with the stator (1). An air gap (9) is arranged between the stator (1) and the rotor (2). The stator (1) comprises a stator yoke and stator teeth (8) which extend in the radial direction from the outer surface of the stator yoke. A stator groove is formed by adjacent stator teeth (8) and the stator yoke. Stator permanent magnets (5) are arranged in each stator groove. The stator permanent magnets (5) in the same stator groove are arranged at certain spacing distance. An armature inner layer winding (3) is wound between adjacent stator teeth (8). According to the motor, rotor side permanent magnet flux leakage is obviously restrained, torque density is improved to the maximum degree, permanent magnets in a claw pole groove have a slot wedge effect, a claw pole winding is fixed in a groove, so that the structure is compact, the magnetizing directions of the permanent magnets are the same, and machining is easy.

Description

technical field [0001] The invention is a permanent magnet synchronous motor with high torque density, which is especially suitable for low-speed direct drive occasions and belongs to the field of permanent magnet motors. [0002] Background technique [0003] The vernier motor is suitable for low-speed and high-torque occasions, especially for the driving device of the carrying equipment, such as electric vehicles, electric locomotives, etc. [0004] To make the vernier motor generate high torque at low speed, it is often necessary to arrange permanent magnets with more pole pairs on the rotor, which results in more magnetic flux leakage. Although its low-speed torque output capability will be improved to a certain extent, The power density of the motor will decrease. Therefore, this occasion is particularly suitable for using an embedded permanent magnet arrangement with a single magnetization direction, thereby reducing magnetic flux leakage to a certain extent, but it i...

AI Technical Summary

Problems solved by technology

[0004] To make the vernier motor generate high torque at low speed, it is often necessary to arrange permanent magnets with more pole pairs on the rotor, which results in more magnetic flux leakage. Although its low-speed torque output capability will be improved to a certain extent, The power density of the motor will decrease. Therefore, this occasion is especially suitable for using an embedded permanent magnet arrangement with a single magnetization direction, thereby reducing magnetic flux leakage to a certain extent, but it is not ideal for increasing torque density.

[0005] Another shortcoming of the vernier motor is similar to that of the magnetic gear, that is, the space of the claw pole slot is not effectively used, which greatly reduces the torque density of the motor. The magnet is made into a magnetism-concentrating stator permanent magnet vernier motor similar to the Halbach array structure

However, this design requires a complex magnetization process, and there is no permanent magnet on the rotor, and the motor torque density is low

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