段间移相90°两单元永磁直线同步电机的建模与控制器设计

Modeling and Controller Design of Subsection Moving-phase 90° Two-module Permanent Magnet Linear Synchronous Motor

针对高精度数控机床用永磁直线同步电机(PMLSM)端部效应引起的推力波动问题,提出了两单元电机段间移相优化设计的思想。通过两单元移相90°形成的四个端部磁导进行相位调节,使磁导端部效应引起的推力波动中的二次谐波成分互相抵消,有效地削弱了端部效应力。为了进一步减小推力波动,在建立这种新型电机数学模型的基础上,对电机进行了自抗扰控制器设计,将端部效应力视为扰动,对其进行观测和补偿。仿真结果表明,采用自抗扰控制器的伺服系统有较好的动态性能及较强的抗干扰性、鲁棒性,较好地抑制了推力波动的影响。

In order to restrain thrust ripples caused by end effects for the permanent magnet linear synchronous motors (PMLSM) used in the high precision numerically controlled (NC) machine, the optimized design method of two-module subsection moving-phase motors is put forward. Second harmonic component in thrust ripples caused by permeance end effects can cancel out by phase adjusting of four end permeance formed by two-module moving-phase 90°.This method can restrain end force effectively. Based on founding mathem...