| 摘要 |
PURPOSE:To suppress the useless consumption of electric power, by separating an exciting phase of a balanced motor from a power source at the time of balance. CONSTITUTION:An output signal E of an AC amplifier 5 is zero at the time of balance, and increases in the positive direction at the time of unbalance from zero. A zero detecting circuit 9 detects the zero state of the output signal E and turns OFF a switch circuit 8. As a result, the exciting current is not flowed to the balanced motor 6 at the time of balance. |
