SYNCHRONOUS MOTOR CONTROL DEVICE AND METHOD

摘要

A conventional synchronous motor control method constitutes a vector control based on a speed estimation and, therefore, requires a gain control in a speed control system by inertia of a load connected with a motor shaft and a comparatively complex operation. A device and a method for a synchronous motor control which can provide a control system not requiring a gain control by inertia of a load with a smaller quantity of operation, by detecting a current, subjecting the detected current to coordinate transformation to a gamma - delta axis assumed on a rotor, determining a correction term from an induced current and an arbitrarily given correction current command, and by adding to a voltage equation in a stationary state of the synchronous motor the correction term multiplied by a proper gain to determine a gamma - delta axis voltage command.