System for controlling a motor

Details System for controlling a motor System for controlling a motor

1984-12-21

1987-02-03

Shoop, Jr., William M.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

318807, B66B 130

Patent

active

046403892

ABSTRACT:
An alternating current having a variable voltage and frequency which is converted by an inverter is supplied to an induction motor for driving an elevator so that a speed command value is decreased and the output frequency of the inverter is decreased at the energy saved operation. Thus, energy saved operation may be accomplished without adversing the efficiency even if the speed of the cage is decreased. Since the output voltage of the convertor is increased simultaneously with this, the power factor is improved so that saving in energy is furthermore enhanced.

REFERENCES:
patent: 3866097 (1975-02-01), Anzai et al.
patent: 4402387 (1983-09-01), Tsuji et al.
patent: 4503937 (1985-03-01), Cervenec et al.
patent: 4545464 (1985-10-01), Nomura
"Theory and Characteristics of a New Induction Motor Drive System Having Linear Transfer Function", IPEC Conference Record, pp. 462-473, H. Sugimoto et al, Mar. 27-31, 1983.

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