Novel PMSM field-weakening control method

Voltage phase control is a novel field-weakening scheme for PMSM which was reported as more stable in high speed region. This paper provides a current ripple reduce method and a frequency-compensation method. The current ripple reduce method deals with the problem that the voltage phase control has bigger current ripple compared to the tradition method. The frequency-compensation method decreases the frequency reference before entering the unstable region. Experimental results show that the proposed methods are effective in current noise reduce and stable running region limit.