B - Operations – Transporting – 66 – B
Patent
B - Operations, Transporting
66
B
364/23
B66B 1/00 (2006.01) B66B 1/06 (2006.01) B66B 1/24 (2006.01) H02M 7/48 (2006.01)
Patent
CA 1199433
ABSTRACT OF THE DISCLOSURE The disclosed AC elevator control system comprises a converter for converting a three-phase AC power applied to it through an electromagnetic switch closed for the start of an associated elevator car, to a direct current, and an inverter for inverting the direct current smoothed by a smoothing capacitor to a three-phase AC power with a variable voltage at a variable frequency which is supplied to a three-phase induction motor for controllably traveling the elevator car. A rectifier is connected across the smoothing capacitor through an impedance element to continuously apply a rectified voltage from the firstmentioned AC power to the capacitor and a voltage sensor relay connected across the capacitor senses the voltage on the latter and prevents the electromagnetic switch from being closed when the sensed voltage is low.
431767
Marks & Clerk
Mitsubishi Denki Kabushiki Kaisha
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