Procedure for fine positioning an alternating current lift

Details Procedure for fine positioning an alternating current lift Procedure for fine positioning an alternating current lift

1980-08-26

1982-10-26

Witkowski, Stanley J.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

B66B 128

Patent

active

043557040

ABSTRACT:
Procedure for exact aligning with the storey floor level of a lift cage driven by an alternating current motor, wherein the current in one or several phases of the lift's drive motor (2) is choked with a controllable choke element (22). The control is governed by a control unit (23) which receives information of the lift cage's (8) true velocity, constituting a feedback-connected control loop which imparts to the lift cage in fine adjustment running a low velocity from which the lift cage is able to stop at the storey floor level within a required tolerance range.

REFERENCES:
patent: 4052651 (1977-10-01), Kamaike
patent: 4083431 (1978-04-01), Oohira et al.
patent: 4150734 (1979-04-01), Ohira et al.
patent: 4181197 (1980-01-01), Tanabe et al.
patent: 4235309 (1980-11-01), Kuhl

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