Patent ID: 7078875

Claim:
A DC motor control apparatus comprising: a DC motor; moving means for receiving drive torque from the DC motor to move a driven body, wherein the moving means includes a torque transmission member which transmits torque from the DC motor, and a predetermined force is generated from the torque transmission member at a stop timing of the driven body; encoder means for periodically outputting a pulse signal according to movement of the driven body; information acquiring means for acquiring velocity information and position information of the driven body based on a time interval of the pulse signal; controlling means for controlling the moving means based on the velocity information and the position information acquired by the information acquiring means; calculating means for calculating a time required in order that the driven body travels a distance corresponding to the amount of shift of a stop position of the driven body by the predetermined force based on at least one of a phase for mechanical periodic disturbance of the moving means, velocity information at a time before a predetermined time period from timing when a stopping process should be performed, a velocity parameter of the controlling means, and a change in load owing to moving conditions; and determining means for determining timing when the stopping process for stopping the driven body should be performed based on the time calculated by the calculating means, wherein the controlling means performs the stopping process for stopping the driven body based on the timing when the stopping process should be performed.