Speed control apparatus for elevator

Details Speed control apparatus for elevator Speed control apparatus for elevator

1985-02-27

1986-11-25

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

318806, H02P 736

Patent

active

046243437

ABSTRACT:
A speed control apparatus for an elevator is so constructed that an operating period of time is limited on the basis of a predetermined current command value or an output from a detector for detecting current to be supplied to an induction motor, thereby to render a load time factor of the induction motor a predetermined value or less and to maintain at or below a permissible value a temperature rise value based on a quantity of heat generated by a winding of the induction motor.
Thus, the induction motor is prevented from burning even when the induction motor is operated at low speed in, for example, a manual operation mode for installation, maintenance and inspection, or the like.

REFERENCES:
patent: 4414499 (1983-11-01), Hedges
patent: 4479565 (1984-10-01), Nomura
patent: 4533862 (1985-08-01), Salihi
patent: 4542324 (1985-09-01), Leuthen
patent: 4567419 (1986-01-01), Watanabe

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