| 摘要 |
PURPOSE:To enable to switch the operating speed of a motor in two stages with a simple structure by selectively interposing an impedance element in a current path of the motor in response to the ON and OFF operating circuit of a manual switch. CONSTITUTION:When a manual switch 5 is opened OFF after once closed, a PUT 20 is closed due to the discharge of condensers 24, 26. When the switch 5 is again closed, a voltage signal Va is not applied to constant-voltage diodes 14, 15. Accordingly, a triac 7 is not triggered, and a reactor 8 is interposed in the current path of the motor 1. Accordingly, the motor 1 is rotated at a low speed. Since the operating speed of the motor 1 is switched by the manual switch 5 of one circuit type in this manner, the wiring work can be facilitated as compared with the conventional one. |
