The Analysis of Ironless Moving-Permanent-Magnet Synchronous Linear Motor Thrust Fluctuation

Wherein, the thrust fluctuation is an important factor affecting the positioning accuracy of the workpiece table. Many scholars have studied the thrust fluctuation reduction methods to improve the motor performance. Some articles optimized structure size [1], or the analytical method ignoring the end effect [2], or using look-up tables [3]. Another scholars have adopted active control strategy to compensate for the thrust fluctuations [4]. For IMPMSLM, the factors that cause the thrust fluctuation include motor size, end-effect of permanent magnet array, magnetic field distribution of permanent magnet array, the number of driving phases and the form of driving current, etc. This paper analyzes these factors respectively.