B - Operations – Transporting – 66 – B
Patent
B - Operations, Transporting
66
B
364/23
B66B 1/00 (2006.01) B66B 1/24 (2006.01) H02M 5/458 (2006.01)
Patent
CA 1197330
Abstract This invention prevents the large charging current from flowing to the capacitor at the start of the elevator for preventing damage of the elements of the rectifier device. Thus the present device provides a control device for an a.c. elevator comprising a commercial a.c. source, a capacitor for smoothing the output voltage of the commercial a.c. source. an inverter for converting the smoothed output voltage of the capacitor into an a.c. power of the variable frequency, an a.c. motor for driving the elevator car by the a.c. power supplied from said inverter, and means for rectifying the voltage of the commercial a.c. source and charging said capacitor by the thus rectified voltage at least when the car is stopped.
408592
Marks & Clerk
Mitsubishi Denki Kabushiki Kaisha
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