关键词: 永磁直线同步电机, 法向电磁力, 谐波电流注入, 振动抑制, 磁致伸缩效应

Abstract: The fluctuation of the normal electromagnetic force of the motor and the magnetostrictive effect of the core material are the main causes of the motor vibration. The harmonic current injection method can effectively suppress motor vibration. The fluctuation of normal electromagnetic force and magnetostriction effect are closely related to the structure and magnetic field distribution of the motor, and there is a coupling relationship between structure and magnetic aspects, which affects the effect of the above suppression method. The relevant mechanism is still unclear.
The main frequency of the normal electromagnetic force wave of the permanent magnet linear motor was analyzed. By means of harmonic current injection, the four-frequency normal electromagnetic force of the motor was weakened and the four-frequency vibration of the motor was suppressed. The influence of magnetostriction effect on core vibration was analyzed, and whether the change of magnetostriction effect on motor vibration affects the selection of harmonic current was explored.

Key words: permanent magnet linear synchronous motor, normal electromagnetic force, harmonic current injection, vibration suppression, magnetostriction effect