Method for providing a load compensation signal for a traction e

Details Method for providing a load compensation signal for a traction e Method for providing a load compensation signal for a traction e

1987-07-29

1988-07-05

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 128

Patent

active

047548509

ABSTRACT:
A method for providing a load compensation signal for the drive motor control loop of a traction elevator system which includes an elevator car, a counterweight, and a drive which includes a drive motor, brake, and traction drive sheave. The brake is mounted to provide an indication of the direction of unbalanced brake torque, with the method including the step of detecting unbalanced brake torque when the elevator car is stationary. A car load compensation signal is provided in response to the detecting step, with the compensation signal transferring the unbalanced torque from the brake to the drive motor, building up the motor current to provide motor torque sufficient to hold the car stationary while the brake torque is reduced to zero. The method then continues by using the motor current to provide car loading signals for use by the supervisory control portion of the elevator system.

REFERENCES:
patent: 3244957 (1966-04-01), Speiss et al.
patent: 3486101 (1969-12-01), Rufli
patent: 3614996 (1971-10-01), Saito et al.
patent: 3847251 (1974-11-01), Maltby et al.
patent: 4042068 (1977-08-01), Ostrander et al.
patent: 4553640 (1985-11-01), Inaba et al.

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