Method and circuit for controlling a position-controlling DC motor and a system for controlling linear displacement in accordance with the method

摘要

The present invention is drawn towards a method and a circuit for controlling a position-controlling DC motor, a system for controlling DC motor, and a system for controlling linear displacement in accordance with the method. The motor (3) has a shaft and is controlled in accordance with an error signal (&egr;) by generating a sequence of variable duty ratio pulses on the basis of the error signal, thereby controlling the motor. The mean value of the pulses is proportional to the difference between the instantaneous position of the motor shaft and a desired or set position at which the motor shaft should stop. Such apparatus may be used to control the orientation of a headlamp and/or an antenna.