Maximum Thrust Control for Variable Magnetic Flux Linear Synchronous Motor with Half-Wave-Rectified Self-Excitation

Abstract

This study proposes a maximum thrust control method for a linear synchronous motor with half-wave-rectified self-excitation. First, we formulate the currents to realize the maximum thrust per ampere control for the linear motor to make it simple and practical. Subsequently, a new field weakening control and maximum thrust per volt control schemes are proposed to determine the current components such that the thrust is truly maximum within the current and voltage limits. The proposed control methods can be used to obtain a maximum thrust control method over the full velocity range for the linear motor that produces maximum thrust within the current and voltage limits. The operation characteristics of the proposed control method are clarified through simulations. The results show that the proposed control method improves the thrust in the high-velocity region.