Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1983-03-09
1985-05-14
Witkowski, Stanley J.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
318801, 318807, 363 97, 363 98, 363131, B66B 502
Patent
active
045166641
ABSTRACT:
An apparatus for controlling an A-C powered elevator wherein: when a frequency instruction value lies within a predetermined frequency range, an inverter in the apparatus produces an A-C electric power having a frequency which lies outside said predetermined frequency range, so that the frequency of the electrical power supplied from said inverter to the motor driving an elevator cage will be out of the resonant frequency range of the mechanical system of the elevator. Namely, an inverter is connected to a D-C power supply, the inverter is controlled by a voltage instruction value and a frequency instruction value, a D-C electric power is converted into the A-C electric power having a variable voltage and a variable frequency by said inverter, and an A-C electric motor is powered by the thus converted A-C electric power to drive an elevator cage, wherein a frequency conversion computer is provided which, when said frequency instruction value lies within a predetermined frequency range, sends to said inverter a frequency instruction value which lies outside said frequency range.
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Anzai Nobuo
Ikejima Hiroyuki
Ip Paul Shik Luen
Mitsubishi Denki & Kabushiki Kaisha
Witkowski Stanley J.
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