AC elevator control system

Details AC elevator control system AC elevator control system

1983-06-27

1985-03-12

Dobeck, B.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

363 49, B66B 106

Patent

active

045039380

ABSTRACT:
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.

REFERENCES:
patent: 3321694 (1967-05-01), Corey
patent: 4282569 (1981-08-01), Hardwick et al.
patent: 4441584 (1984-04-01), Mitsui et al.

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