| 摘要 |
A speed control system for a motor comprising a main motor circuit supplying motor current to the motor from an A.C. power source through a semiconductor element provided with a control electrode, trigger voltage supplying means supplying trigger voltage to the control electrode of the semiconductor element, motor voltage detecting means for detecting voltage induced in the motor, and automatically variable resistance means having its resistance value varied automatically depending on the detected motor voltage. In the system, the trigger voltage supplied by the trigger voltage supplying means is controlled depending on the variation in the resistance value of the automatically variable resistance means, and the firing angle of the semiconductor element is retarded in response to an increase in the detected motor voltage and advanced in response to a decrease in the detected motor voltage. |
| 申请人 |
YAMAMOTO ELECTRIC INDUSTRIAL CO., LTD., SUKAGAWA, FUKUSHIMA (JAPAN) |
发明人 |
SOEDA, KATSUJI;SAKUMA, FUMIO;OOYAMA, MITSUHIRO |
