Method and system for controlling a permanent magnet machine

摘要

Method and system for controlling a permanent magnet machine (12) are provided. The method provides a sensor assembly (14) for sensing rotor sector position relative to a plurality of angular sectors. The method allows starting the machine in a brushless direct current mode of operation using a calculated initial rotor position based on angular sector position information from the sensor assembly. Upon reaching a predefined mode-crossover criterion, the method allows switching to a sinusoidal mode of operation using rotor angle position based on extrapolating angular sector position information from the sensor assembly.