Research on Thrust Ripple Suppression of Multi-Sided Assembly Permanent-Magnet Linear Motor Under Rectangular Outline Constraints

To address the issue that thrust ripple in permanent magnet linear motors (PMLMs) adversely affects high-precision motion control performance, this paper studies a multi-sided assembly permanent magnet linear motor, focusing on the generation mechanism and suppression methods of thrust ripple. Firstly, the topology and key parameters of the studied PMLM are elaborated, the characteristics of end force fluctuations under no-load conditions are analyzed. Then, the influence of asymmetry in three-phase winding parameters on loaded thrust fluctuations is examined, and corresponding solutions to suppress these fluctuations are proposed. Furthermore, a method to suppress thrust ripple by adjusting the primary position and reconstructing the windings is proposed. Simulation results demonstrate that the proposed method can effectively smooth the electromagnetic thrust, providing a reference for enhancing the performance of high-precision direct-drive systems.