Apparatus for controlling elevators

Details Apparatus for controlling elevators Apparatus for controlling elevators

1984-10-09

1986-07-15

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

046000887

ABSTRACT:
An apparatus for controlling an elevator having an induction motor for lifting the cage, a speed instruction device which produces a running speed instruction signal for the cage, a speed controller which generates a torque instruction for the induction motor, a current controller which produces a primary current for the induction motor to control it, a first speed detector which is coupled to the induction motor via a mechanism that increases the input speed to the detector and which feeds speed detection signals back to the speed controller, and a second speed detector which is directly coupled to the rotary shaft of the induction motor and which supplies speed detection signals to the current controller.

REFERENCES:
patent: 4085823 (1978-04-01), Caputo et al.
patent: 4161235 (1979-07-01), Caputo et al.
patent: 4263988 (1981-04-01), Inaba et al.
patent: 4308936 (1982-01-01), Caputo et al.
patent: 4354577 (1982-10-01), Yonemoto
patent: 4493398 (1985-01-01), Kindler

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