Speed control apparatus for an elevator

Details Speed control apparatus for an elevator Speed control apparatus for an elevator

1986-05-05

1987-06-09

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

318798, B66B 130

Patent

active

046713891

ABSTRACT:
A speed control apparatus for an elevator utilizing variable command values of the primary current of an induction motor for controlling the operation of the motor. When the cage is running at a rated speed, the terminal voltage of the induction motor is detected and supplied to a microcomputer to calculate an exact secondary resistance with respect to the temperature condition of the induction motor so as to determine the aforementioned command value of the primary current that is necessary for high speed precision control.

REFERENCES:
patent: 4451770 (1984-05-01), Boettner et al.
patent: 4475631 (1984-10-01), Nomura
patent: 4519479 (1985-05-01), Tanahashi
patent: 4546301 (1985-10-01), Tinebor et al.
patent: 4567419 (1986-01-01), Watanabe
patent: 4576253 (1986-03-01), Tanahashi et al.
patent: 4602702 (1986-07-01), Tanahashi
patent: 4624343 (1986-11-01), Tanahashi et al.

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