A Parameter Insensitive Rotor Angle Extraction Approach using Carrier Frequency Components by Phase Shifted Carrier PWM for PMSM Drives

This paper presents an anisotropy based sensorless control of PMSM using carrier frequency injection with a parameter insensitive rotor angle demodulation process ensuring higher bandwidth and robust tracking. Conventional methods make use of an additional high frequency signal which limits the system's bandwidth. In this paper, the triangular carrier wave is time shifted by one-third of its period, creating a carrier frequency rotating field. The carrier frequency current response is then used for extracting the rotor information. The effectiveness of the method is simulated in MatLab Simulink environment.