| 摘要 |
<p>An AC electric motor (2) is started by applying a full voltage from an AC power supply (R, S, T) to the AC electric motor in a stop state on the unit of a positive or negative half-wave through a repetition of an ON time of a multiple of integer thereof and an OFF time subsequent thereto, and a ratio of the ON time to a sum of the ON time and the OFF time is gradually increased as the time elapses from by a factor of a certain number up to "1" during the starting process. <IMAGE></p> |
