Research on the Single Current Regulator Flux-Weakening Control for Permanent Magnet Linear Synchronous Motor

In this paper, single current regulator flux-weakening control based on the d-q current cross-coupling effect for permanent magnet linear synchronous motor (PMLSM) is improved and a stable control process is implemented. When the speed exceeds a certain value, the control strategy is switched from the conventional double closed-loop control method to the flux-weakening control method. The method of taking the average value of multi-point sampling is used for mode switching judgment. And the improved switching method of the control mode achieves a stable switching process.