Yoke-free closed slot type multi-plate permanent magnet motor

Abstract

The invention discloses a yoke-free closed slot type multi-plate permanent magnet motor comprising a motor housing, a plurality of rotors, and a plurality of stators. The motor housing consists of a rotating shaft, a bearing, a front end cover, a rear end cover and a casing; the plurality of rotors are fixed with the rotating shaft; and the stators are arranged among the adjacent rotors. Each stator has a yoke-free closed slot structure formed by two stator outer teeth, a stator inner tooth between the two stator outer teeth, a stator inner plug, a stator outer plug, and a winding. Each rotor with a combined oblique pole structure includes a plurality of rotor plates that are distributed coaxially at intervals along the axial direction and fan-shaped permanent magnets contacted to the rotor plates. According to the invention, the provided yoke-free closed slot type multi-plate permanent magnet motor has advantages of improved slot full rate, iron core material saving, torque quality improvement, torque density enhancement, and improvement of whole operation efficiencies of the low speed and light load.

Description

technical field [0001] The invention belongs to the technical field of motors, and more specifically relates to a multi-disk permanent magnet motor. Background technique [0002] The most notable feature of electric vehicles today is frequent start and stop, acceleration and deceleration, rather than running at a certain constant speed. Based on the performance requirements of electric vehicles, the motor system used in them is required to have high instantaneous power and power density. It should have higher high and low speed comprehensive efficiency. Due to its own characteristics, the axial permanent magnet motor is very suitable for electric vehicle driving occasions, while the multi-disk permanent magnet motor can further improve the torque density and instantaneous power, and can also effectively solve the problem of the drive system at low speed and low load through winding switching. The problem of low efficiency under working conditions. [0003] Invention patent...

AI Technical Summary

Problems solved by technology

Both of the above two patents propose a multi-disk permanent magnet motor, but the structure is complex, there is a stator core yoke, and the material utilization rate is not high enough, which has a certain impact on the system efficiency

[0004] In addition, the cogging torque of the existing multi-disk permanent magnet motor is generally formed by the superposition of the cogging torque generated by the single-disc motor. The cogging torque is large, which affects the reliability of the motor operation, control positioning accuracy, etc. have brought adverse effects and caused problems such as vibration and noise

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