Patent ID: 7999496

Claim:
Control system for an electric machine comprising a multi-phase multipole motor having a machine stator, and a machine rotor, comprising: a voltage source inverter generating phase voltages applied to the electric machine in response to final voltage commands provided to the voltage source inverter; a resolver assembly comprising a resolver rotor operably connected to the machine rotor and a resolver stator operably connected to the machine stator, said resolver stator providing an electrical signal output; and a controller providing stationary frame voltages, providing stationary frame currents based upon measured phase currents from the electric machine, summing voltage signals at a predetermined high frequency with the stationary frame voltages to generate the final voltage commands, providing the final voltage commands to the voltage source inverter, deriving a machine rotor position based upon the stationary frame currents and the predetermined high frequency, measuring a resolver rotor position from the electrical signal output provided from the resolver stator, determining an offset parameter as a difference between the derived machine rotor position and the measured resolver rotor position, and controlling the voltage source inverter based upon the measured resolver rotor position and the offset parameter.