Patent ID: 6108279
Filing Date: 2000-08-22
Classification: G04C

Abstract:
A device for controlling a stepping motor, the stepping motor including a multi-poled rotor that is rotatably driveable within a stator having a drive coil, comprising:first driving means for supplying a first drive pulse to said drive coil for rotating said rotor, said first drive pulse having an effective power;rotation detection means for detecting whether said rotor has rotated in response to said first drive pulse;auxiliary means for supplying an auxiliary pulse having an effective power that is larger than said effective power of said first drive pulse when the rotation of said rotor is not detected;level adjustment means for decrementing the effective power of said first drive pulse after said rotor has rotated for a first predetermined number of times consecutively; andsecond driving means for applying a second drive pulse having an effective power that is higher than the effective power level of said first drive pulse and lower than said effective power of said auxiliary pulse, the effective power of said second drive pulse being adjusted by said level adjustment means, said second drive pulse being output for a second predetermined number of times after said auxiliary pulse is supplied.