Stepping motor driving system and stepping motor driving process

A process for driving a stepping motor having an independent winding, utilizing a stepping motor driving system, 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;
• and
• said stepping motor driving process comprising the steps of:
• controlling said switching element by said switching element controlling means;
• causing motor supply current to flow through said motor coil until said coil current detection value reaches an upper limit set point;
• causing motor reflux current to flow through said motor coil until predetermined time elapses since said motor supply current begins to flow after said coil current detection value reached said upper limit set point;
• causing motor regeneration current to flow through said motor coil until said coil current detection value reaches a lower limit set point when said predetermined time has passed;
• and
• causing motor reflux current to flow through said motor coil until predetermined time elapses since said motor regeneration current begins to flow after said coil current detection value reached said lower limit set point.

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 supply time corresponding to said coil current detection value and a target current value elapses, motor reflux current is passed through said motor coil until predetermined time passes since said motor supply current begins to flow after said supply time passed, motor regeneration current is passed through said motor coil until regeneration time corresponding to a command speed elapses when said predetermined time has passed, and motor reflux current is passed through said motor coil until predetermined time passes since said motor regeneration current begins to flow after said regeneration time passed.

A process for driving a stepping motor having an independent winding, utilizing a stepping motor driving system, 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;
• and
• said stepping motor driving process comprising the steps of:
• controlling said switching element by said switching element controlling means;
• causing motor supply current to flow through said motor coil until supply time corresponding to said coil current detection value and a target current value elapses;
• causing motor reflux current to flow through said motor coil until predetermined time elapses since said motor supply current begins to flow after said supply time passed;
• causing motor regeneration current to flow through said motor coil until regeneration time corresponding to a command speed elapses when said predetermined time has passed;
• and
• causing motor reflux current to flow through said motor coil until predetermined time elapses since said motor regeneration current begins to flow after said regeneration time passed.