Velocity control apparatus for elevator

Details Velocity control apparatus for elevator Velocity control apparatus for elevator

1984-08-10

1986-09-16

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

B66B 130

Patent

active

046116893

ABSTRACT:
A velocity control apparatus for an elevator wherein an inverter is controlled by a velocity command signal so as to generate a three-phase alternating current of variable voltage and variable frequency, a three-phase induction motor is driven by the three-phase alternating current, a load acting on the three-phase induction motor is detected by a tachometer generator, and a correction circuit is disposed which adjusts the voltage to be produced from the inverter, in accordance with an absolute value signal of a difference between the detected velocity signal of the tachometer generator and the velocity command signal.

REFERENCES:
patent: 4213517 (1980-07-01), Ando
patent: 4319665 (1982-03-01), Komuro et al.
patent: 4475631 (1984-10-01), Nomura
patent: 4501343 (1985-02-01), Salihi

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