Patent ID: 8519649

Claim:
A control device of a synchronous machine comprising: an inverter configured to provide an output current to drive the synchronous machine; a controller configured to generate a gate command, wherein the gate command controls the output current, wherein the controller comprises a current tracking pulse width modulation method controller and a voltage type pulse width modulation method controller, wherein the current tracking pulse width modulation method controller only chooses a non-zero vector and generates the gate command by using the chosen non-zero vector at a time when the inverter transitions from not driving the synchronous machine with the output current to driving the synchronous machine, wherein the voltage type pulse width modulation method controller is configured to control the output current of the inverter at a time after the inverter transitions to driving the synchronous machine; and a phase angle and angular velocity estimating section configured to estimate a phase angle and an angular velocity of a rotor of the synchronous machine based, at least in part, on an inductance value, an induction voltage value, the gate command, and the output current to be supplied to the synchronous machine; wherein the controller is further configured to control the output current based, at least in part, on the phase angle and the angular velocity.