Over-modulation Algorithm of PMSM Control System under Flux-weakening Operation

T. T. Liu, G. J. Chen, Z. H. Li, Q. H. Meng,

“Over-modulation Algorithm of PMSM Control System under Flux-weakening Operation”, Journal of Mechanical Engineering Research and Developments

ABSTRACT: In this paper, an over-modulation algorithm based on space vector pulse width modulation (SVPWM) is proposed. For purpose of improving the utilization ratio of inverter’s DC bus voltage, modulation region is judged by the action time of zero voltage vector. This over-modulation algorithm is applied in flux-weakening operation region of permanent magnet synchronous motor (PMSM) control system, which extends the operation region of flux-weakening control and increases the output torque and power of motor. The control strategy is verified by simulation experiments of PMSM control system, with over-modulation algorithm, the running effect of PMSM under flux-weakening operation is discussed.

Keywords: PMSM; SVPWM; Over-modulation; Flux weakening operation.