Speed control system for elevators

Details Speed control system for elevators Speed control system for elevators

1989-04-18

1991-01-08

Pellinen, A. D.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

318803, B66B 130

Patent

active

049828169

ABSTRACT:
In an elevator provided with an inverter driven induction motor, output torque is determined by direct current of an inverter, slip frequency is determined from the thusly determined torque, the gap between an open-loop dictated speed pattern and the actual speed is compensated by the slip calculated during acceleration and constant speed movement, so that the open-loop control may be improved in terms of stop position precision.

REFERENCES:
patent: 4330741 (1982-05-01), Nagase et al.
patent: 4366427 (1982-12-01), Walker et al.
patent: 4483419 (1984-11-01), Salihi et al.
patent: 4600088 (1986-07-01), Yonemoto
patent: 4602701 (1986-07-01), Tanahashi
patent: 4625834 (1986-12-01), Tanahashi
patent: 4677361 (1987-06-01), Yonemoto

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