Luenberger current observer with adaptive gain for permanent magnet synchronous machines in automotive application

Abstract

A method for operating a motor drive to supply power to an electric motor comprises: measuring at least one phase current in the electric motor; measuring a rotational speed of the electric motor; adjusting, based on the rotational speed of the electric motor, at least one observer gain coefficient of an observer gain matrix of a Luenberger Current Observer (LCO); and determining, using the LCO, an estimated motor current of the electric motor. A motor drive comprises: an inverter operable to supply AC power to an electric motor, a current sensor, a speed sensor, and a controller configured to: adjust, based on the rotational speed of the electric motor, at least one observer gain coefficient of an observer gain matrix of a Luenberger Current Observer (LCO). The controller is also configured to determine, using the LCO, an estimated motor current of the electric motor.

Dependencies are inferred from the claim text.