| 摘要 |
PURPOSE:To enable a current control adapted for the speed or position control, etc., of a motor by correcting data of a storage element according to the difference of a detected current from a current command value and by determining the conduction ratio of other pulses using a commutating period from said data of the storage element. CONSTITUTION:As electric current is once detected by a current detecting element 8, a current error between a detected current value 11 and a command current value corresponding to said detected current value 11 is integrated and, after the end of one commutating period, conduction ratio data 36 are corrected according to the integrated value of the current error during said commutating period. Also, the conduction ratio of an outputted pulse-duration modulation signal 10 is determined and a correction for each commutating period is repeated by the operation of the conduction ratio data 36 corrected already until the last commutating period and the percentage data 37 of said conduction ratio read successively from a read-around storage element 7-2b. |
