The flux-weakening control strategy based on an integrated SVPWM modulation algorithm in permanent magnet synchronous motors

This paper proposes an optimal flux-weakening control strategy to improve the flux-weakening performance of permanent magnet synchronous motor. Based on the successful implementation of integrated SVPWM algorithm, the strategy calculates the voltage difference between the input and output of integrated SVPWM module according to the two adjacent basic voltage vector times and the zero voltage vector time, and then adjusts the flux-weakening current pass by a first-order low pass filter. The optimized strategy can be simply and easily implemented without requiring the accurate motor parameters. Experimental results show that the strategy not only improves the utilization rate of the inverter dc bus voltage, but also increases the flux-weakening basic speed turning point and expands the steady state running region.