| 摘要 |
<p>PURPOSE:To shorten the time from a start to phase lock-in by operating phase control means when the rotating speed of a motor at the motor starting time becomes substantially the same rotating speed at the phase lock-in time. CONSTITUTION:When the start signal (b) of a motor becomes H level, a phase comparator 8 is released from its reset, but its output (h) is in the state of the intermediate level. The rotating speed of the motor 1 is controlled to rotate at the same rotating speed as that after the phase lock-in by the output (h). When the rotating speed of the motor 1 becomes the same rotating speed as that after the phase lock-in, the output (c) of a rotation variation detector 14 becomes H level. Thus, D flip-flops 16, 17 are set, and the comparator 8 outputs a phase comparison signal (h). Thus, the time from the start to the phase lock-in can be shortened.</p> |
