Adaptive Voltage Controller for Flux-weakening Operation in PMa-SynRM Drives

An adaptive gain for voltage controller in flux weakening control of permanent magnet assisted synchronous reluctance motor (PMa-SynRM) is introduced. The voltage feedback controller can adjust the current control locus and utilize the DC link voltage in the flux-weakening region based on the voltage angle control scheme. The voltage controller is controlled using the difference between voltage reference magnitude and a proper inverter limit value. The analysis of the voltage controller is performed, taking into account the modulation delay to issue the compensation performance with different voltage feedback gains from different PMa-SynRM operating conditions. The adaptive gain of the voltage controller is applied with forwarding feedback voltages and current vector to improve dynamic response with smaller voltage errors. The verification results on a 1-kW PMa-SynRM platform demonstrate the effectiveness of the proposed method.