Bias torque for elevator hoist drive to avoid rollback, rollforw

Details Bias torque for elevator hoist drive to avoid rollback, rollforw Bias torque for elevator hoist drive to avoid rollback, rollforw

1994-09-28

1996-07-02

Wong, Peter S.

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

187392, B66B 144, B66B 134

Patent

active

055312942

ABSTRACT:
Armature current I.sub.ARM is measured at full load and empty load. These two values are used to calculate a pre-torque armature current gain (MBIAS) and an overbalance correction is included in calculation of an elevator pre-torque armature current I.sub.ARM to compensate for an erroneous overbalance value for providing an armature current I.sub.ARM which does not cause rollback or rollforward of an elevator hoist motor.
Samples of elevator car load and armature current I.sub.ARM are taken after the elevator brake is lifted, with the car at zero velocity, over a number of runs for continually recalibrating the pre-torque armature current gain (MBIAS) and offset, thereby compensating for any drift in performance of the loadweighing system.

REFERENCES:
patent: 4754850 (1988-07-01), Caputo
patent: 4793442 (1988-12-01), Heckler et al.
patent: 4939679 (1990-07-01), David et al.
patent: 5172782 (1992-12-01), Yoo et al.
patent: 5343003 (1994-08-01), Jamieson et al.
patent: 5407030 (1995-04-01), Burton et al.

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