Patent ID: 7068007

Claim:
A stepping motor driving system for driving a stepping motor having an independent winding, said stepping motor driving system comprising: a switching element for controlling current that flows through a motor coil; a current detecting means for detecting said current flowing through said motor coil; and a switching element controlling means for controlling said switching element on the basis of a motor current detection value that is an output of said current detection means; said switching element controlling means being adapted to control said switching element in such a manner that motor supply current is passed through said motor coil until said coil current detection value reaches an upper limit set point, motor reflux current is passed through said motor coil until predetermined time passes since said motor supply current begins to flow after said coil current detection value reached said upper limit set point, motor regeneration current is passed through said motor coil until said coil current detection value reaches a lower limit set point when said predetermined time passes, and motor reflux current is passed through said motor coil until predetermined time passes since said motor regeneration current begins to flow after said coil current detection value reached said lower limit set point.