| 摘要 |
PURPOSE:To prevent a capacitor from being quickly charged at starting time by charging in advance the capacitor by the second rectifier at stopping time. CONSTITUTION:A 3-phase AC power source is supplied through the contacts 12a-12c of an operation electromagnetic contactor which is closed at operating time and opened at stopping time, a rectifier 1, a smoothing condenser 2, and an inverter 3 to a 3-phase induction motor 4. The condenser 2 is charged by a rectifier 15 and an impedance 16 even during the stopping of a cage 10. Accordingly, even if the contacts 12a-12c are closed at starting time, the quick charging of the condenser 2 is avoided by a low impedance DC current by the rectifier 1. |
