Device for controlling an electric motor and method for monitoring an abnormal operation of an electric motor

Device for controlling an electric motor comprising a terminal control section generating a control signal to control the motor, a driving section generating a driving signal based on the control signal to drive the motor, a counting section counting periods of the driving signal output from the driving section, and an abnormality judging section judging whether or not the driving section is in an abnormal operating condition based on the control signal and a counting result of the counting section.