Permanent magnet segmented PWM array sine wave disc type motor

Abstract

The invention relates to the field of disc type motors, in particular to a sine wave disc permanent magnet synchronous motor, and discloses a permanent magnet segmented PWM array sine wave disc type motor. The permanent magnet segmented PWM array sine wave disc type motor comprises rotor discs, stator discs and permanent magnets, and the permanent magnets are mounted on the rotor discs. The stator discs are mounted between every two stator discs, and the number of the rotor discs is larger than the number of the stator discs by one. The stator discs and the rotor discs are coaxially mounted, and the stator discs and the rotor discs are alternately arrayed in the axial direction. The permanent magnets of each pole on the rotor discs are arranged in a segmented mode, the number of the permanent magnet segments under each pole is an odd number, and the width of each permanent magnet segment is determined according to the PWM principle. The harmonic component of the induced electromotive force of the motor is lowered, and the harmonic loss of the motor is reduced. The vortex loss of the permanent magnets is lowered, the temperature of the permanent magnets on rotors is lowered, the high-temperature demagnetization risk of the permanent magnets is lowered, and the efficiency of the motor is improved. The permanent magnets of each pole are the same in thickness and are beneficial to processing and designing. Meanwhile, after multiple segments of permanent magnets are divided, the mounting process can be better simplified.

Description

technical field [0001] The invention relates to a sine wave disc motor with segmental PWM arrangement of permanent magnets, which relates to the field of disc motors, in particular to a sine wave disc permanent magnet synchronous motor. Background technique [0002] In the field of motors, permanent magnet motors have been receiving extensive attention from academia and industry due to their compact structure and high power density. As an important branch of permanent magnet motor, disc motor has been further developed with the development of permanent magnet materials, especially the emergence of high-performance NdFeB permanent magnet materials. Compared with the radial permanent magnet synchronous motor, the disc permanent magnet synchronous motor has important characteristics such as small axial size and strong overload capacity, so it has high application value in some occasions with high environmental requirements. [0003] Although the disc motor has the characterist...

AI Technical Summary

Problems solved by technology

It should be noted that although the application of Halbach array permanent magnets in permanent magnet motors has many advantages such as improving the sine degree of the air gap magnetic field and the magnitude of flux density, the magnetization direction of each segment of the permanent magnet of the Halbach array under each pole is different. , which increases the difficulty of processing the permanent magnets, and also brings many problems that are difficult to install on the rotor

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