| 摘要 |
PROBLEM TO BE SOLVED: To improve the current detecting accuracy of current detecting resistors so as to prevent the deterioration of the control of the drive of a stepping motor by means of a stepping motor driving circuit by feeding back the results of the comparison between a reference voltage which, provides for the phase current of a stepping motor and detected voltages to a control section. SOLUTION: The electric current flowing to a stepping motor M is detected by means of current detecting resistors R11-R16 and inputted to comparators C11-C16 where the currents are compared with a reference voltage having a sine waveform from a control section 11. The compared results are fed back to the section 11. The section 11 drives the motor M so that a phase current following the reference voltage having the sine waveform can flow to the motor M. Therefore, the detecting accuracy of the resistors R11-R16 can be improved and the deterioration of the control of the drive of the motor M can be prevented. |
