A leading angle flux-weakening speed control of permanent magnet synchronous motor applied on electric vehicle

This paper presents a leading angle flux-weakening control method for the wide-speed operation of permanent magnet synchronous motor (PMSM). The angle offset of flux-weakening is gained by integraling the error of given index and calculation index, which is the utilization of motor´s terminal voltage to the voltage of DC bus, and then a voltage loop is established to maintain the stability of flux-weakening system. In different speed region, the optimum d-axis and q-axis current command can be calculated according to the new electrical angle of PMSM. The method is suitable for flux-weakening control of any kind of PMSM. The results of simulation and experimentation demonstrate the feasibility of this strategy.