Method and system for controlling a permanent magnet machine are provided. The method provides a sensor assembly for sensing rotor sector position relative to a plurality of angular sectors. The method further provides a sensor for sensing angular increments in rotor position. The method allows starting the machine in a brushless direct current mode of operation using a calculated initial rotor position based on an initial angular sector position information from the sensor assembly. Upon determining a transition from the initial angular sector to the next angular sector, the method allows switching to a sinusoidal mode of operation using rotor position based on rotor position information from the incremental sensor.
This invention was made with U.S. Government support through Definitized Subcontract C-HEV-5A under MRI/CHRYSLER Subcontract No. ZAN-6-16334-01 under PRIME CONTRACT NO. DE-AC36-83CH10093 awarded by the Department of Energy, and in accordance with the terms set forth in said contracts, the U.S. Government may have certain rights in the invention.