Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1987-07-29
1988-04-19
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
187116, B66B 144
Patent
active
047383372
ABSTRACT:
A method and apparatus for providing a load compensation signal for the drive motor control loop of a traction elevator system which includes an elevator car having a load responsive platform and a counterweight. The load compensation signal transfers unbalanced torque from the system brake to the drive motor at the start of the run, to provide smooth starts. The load compensation signal is heavily filtered to provide a response time which will follow changes in car loading but too slow to affect car dynamics. Thus, the load compensation signal is continuously connected to the motor control loop, eliminating switches and memories, and enabling the compensation signal to directly aid car landing. Non-linearities in the load responsive platform are partially compensated for by three initial adjustments, and a fourth adjustment is provided for periodically offsetting changes due to ageing of platform isolation materials.
The load compensation signal may be added directly to the motor control loop, or further processed to account for hoist cable weight compensation error at the location of the elevator car.
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patent: 4380275 (1983-04-01), Kahklpuro
patent: 4452341 (1984-06-01), Tanahashi
Duncanson Jr. W. E.
Lackey D. R.
Shoop Jr. William M.
Westinghouse Electric Corp.
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