Adaptive Voltage Controller for Flux-weakening Operation in PMSM Drives

An adaptive gain for voltage controller in fluxweakening control of permanent magnet synchronous motor (PMSM) is proposed. Based on voltage angle control scheme, voltage feedback controller can adjust control current locus and utilize the DC link voltage in flux-weakening region. The voltage controller is controlled using the difference between voltage reference magnitude and and a proper inverter limit value. The analysis of voltage controller is carried out, taking into account of modulation delay to issue the compensation performance with different voltage feedback gains from difference PMSM operating conditions. The adaptive gain of voltage controller is applied with forward feedback voltages and current vector to improve dynamic response with smaller voltage errors. The results of verification on a 7-kW PMSM platform demonstrate the effectiveness of the proposed method.