Elevator speed control circuit

Details Elevator speed control circuit Elevator speed control circuit

1997-06-07

1998-10-27

Nappi, Robert

Elevator, industrial lift truck, or stationary lift for vehicle

Having specific load support drive-means or its control

Includes control for power source of drive-means

187293, 187295, B66B 134

Patent

active

058280146

ABSTRACT:
In an elevator speed control circuit that has a proportional and integral speed amp 3 responsive to the deviation between a speed command .omega.* and actual motor speed .omega..sub.M, there is provided a car motion feedback circuit that amplifies the difference between a speed command .omega.* and actual car speed .omega..sub.car (or acceleration command and actual acceleration) with amp 12, extracts car vibration characteristics through band-pass filter 14, and changes these vibration components to the optimal phase in a phase correction filter 16 for feeding back. A load torque predictor 21 estimates load torque from signals from circuits 2-19 and from actual motor speed .omega..sub.M to improve speed feedback characteristics and the effectiveness of external disturbance suppression in elevator speed control. A variety of variable circuit elements are disclosed.

REFERENCES:
patent: 3631326 (1971-12-01), Virkala
patent: 4269286 (1981-05-01), Ishii et al.
patent: 4271931 (1981-06-01), Watanabe
patent: 4616733 (1986-10-01), Ishii
patent: 5070967 (1991-12-01), Katzy et al.
patent: 5542501 (1996-08-01), Ikejima et al.

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