| 摘要 |
PURPOSE:To stably control phase even if current phase leads as compared with voltage phase. CONSTITUTION:In a control circuit of a power control element for energizing an electric motor 7 and an ignition circuit 2 for controlling the phase of the power control element and then the electric motor 7 for detecting an error 12 between a command speed 1 and a detection 9 of the number of rotations. phase can be controlled by combining a circuit 15 for judging voltage polarity and a thyristor which is a power control element. |
