Speed control apparatus for elevator

Details Speed control apparatus for elevator Speed control apparatus for elevator

1985-04-24

1986-12-16

Miska, Vit W.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

318798, B66B 130

Patent

active

046290354

ABSTRACT:
A speed control apparatus for an elevator in which a temperature detector for detecting the ambient temperature of an induction motor is disposed, and an arithmetic unit employing a microcomputer is additionally furnished with the function of evaluating the component of temperature rise of a rotor and obtaining the resistance value of the rotor by the use of this component of temperature rise and the temperature detection signal of the temperature detector, to evaluate the optimum instantaneous current command by the use of the temperature-compensated resistance value, whereby the overvoltage and the insufficient torque of the induction motor can be obviated.

REFERENCES:
patent: 4471855 (1984-09-01), Nomura
patent: 4510548 (1985-04-01), Boothman
patent: 4541747 (1985-09-01), Imaizumi et al.
patent: 4542324 (1985-09-01), Leuthen
patent: 4567419 (1986-01-01), Watanabe

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