Simulation and Test Study on Direct Force Control for Permanent Magnet Linear Synchronous Motor

Permanent magnet linear synchronous motor (PMLSM), which has the advantages of simple structure, small volume, high force, is a research focus and difficulties because of the thrust ripple and control problems for PMLSM. In this paper, in order to reduce thrust ripple and improve system control performance, the space voltage vector pulse width modulation technology (SVPWM) was introduced into the directing force control (DFC) strategy of PMLSM. In the running process, the temperature of PMLSM will rise, which changes the resistance of the primary winding. Full consideration of the change of the resistance in the motor running process, the error between the flux observed value and the actual value was analyzed. And then a new flux dynamic compensation algorithm based on flux dynamic compensation was proposed. The novel dynamic compensator was built to improve the observation accuracy of the primary flux, which solved effectively the wrong voltage vector choice and the system control performance failure due to the error of the primary flux. The Simulation and test results show that the PMLSM DFC based on SVPWM and the flux dynamic compensation has better control performance.