Performance of current controllers for VSI-fed IPMSM drive

The current-controlled voltage-source-inverter-fed interior permanent-magne t synchronous motor (IPMSM) has received widespread interest in high-precis ion industrial drive applications, This paper presents a detailed compariso n of various current controller schemes, particularly hysteresis and ramp c omparator controllers for the IPMSM drive based on performance at different speeds. The hysteresis and the ramp comparator controllers are getting mor e attention due to their simplicity and high dynamic responses. In this pap er, fixed, sinusoidal, and mixed-band hysteresis current controllers, as we ll as conventional ramp and improved ramp comparator controllers, are consi dered. The harmonic spectra of the motor line currents for various current controllers are obtained using a fast Fourier transform for comparison purp oses. The comparison is based on experimental results. In order to compare the performance of various controllers, the complete drive system is implem ented in real time using the digital signal processor controller board DS-1 102.