Elevator drive control apparatus for smooth start-up

Details Elevator drive control apparatus for smooth start-up Elevator drive control apparatus for smooth start-up

1988-05-26

1989-05-09

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 144

Patent

active

048280755

ABSTRACT:
An elevator control apparatus suppresses the jerk at the start-up of speed controlled elevator installations in both directions of travel, not only the friction jerk at the transition from the static friction to the sliding friction, but also the imbalance jerk at unbalanced car loads. A set point signal multiplier is connected to the output side of a set point memory in the hoist motor drive control and the set point multiplying factor can be controlled by way of an on/off circuit. The multiplier is switched, prior to the start of the movement, by the on/off circuit to a value greater than one, and is switched back to one at start of movement in the direction of travel. The motor driving force is controlled to a value which, when summed with the imbalance force, is equal to the sliding friction force at start-up. This suppression of jerks is eminently suitable for the refitting of controlled elevator drives and increases, due to the earlier start of movement, their elevating capacity.

REFERENCES:
patent: 3614996 (1971-10-01), Saito et al.
patent: 4380275 (1983-04-01), Kahkiputo
patent: 4738337 (1988-04-01), Caputo

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