Patent ID: 6380705
Filing Date: 2002-04-30
Classification: H02P

Abstract:
A chopping energization control device comprising:first switching means interposed between one end of an electric coil of an electric motor and one terminal of a power supply; second switching means interposed between the other end of the electric coil and the other terminal of the power supply; signal generation means for generating an energization indication signal which makes the first switching means and the second switching means conductive in order to establish a chopping energization of the electric coil at a frequency on the basis of a target driving torque and a motor speed value of the electric motor; and control means for reducing the chopping frequency while the motor speed value of the electric motor is equal to or less than a predetermined value so that the chopping frequency while the motor speed value is equal to or less than the predetermined value is lower than the chopping frequency while the motor speed value is greater than the predetermined value.