Driving apparatus and driving system for electric motor

摘要

An apparatus for controlling the drive of an electric motor, having a current detector (4) for detecting the current through an externally connected electric motor (3) ; a controller (1) for generating a control signal to control the electric motor (3) on the basis of the current detected by the current detector (4) and the speed command for specifying the rotational speed of the electric motor (3); wherein the apparatus includes a load estimator (10) for estimating the mechanical load condition associated with the electric motor (3) on the basis of the current detected by the current detector (4) and the speed command, and the controller (1) controls the electric motor current on the basis of the detected current, the speed command and the estimated load condition.