| 摘要 |
PURPOSE:To realize application of a current to a stator winding, at the time of initiating current feeding, which will never degrade efficiency even for change of rotating velocity by providing an apparatus for detecting current waveform and a loop for feeding information back to a current feed initiation signal generating circuit upon decision of current waveform. CONSTITUTION:When rotation starts, information of current waveform cannot be obtained and therefore CPU outputs a certain information to a current feed initiation signal generating circuit 5. When commutation is started, a current waveform is digitally converted and inputted to CPU until the commutation mode is switched. Upon completion of fetching of current waveform, it is decided whether t1=t2. When t1=t2, information is continuously outputted to the current feed initiation signal generating circuit, waiting for the next current feed initiation point. When t1>t2, information for ensuring leading of the commutation timing for a constant time is outputted to the current feed initiation signal generating circuit 5. When t1<t2, information for delaying the commutation timing for a constant time is outputted. The waiting time is here prepared, waiting for the next current feed initiation point. |
