Method and apparatus for providing pre-travel balancing energy t

Details Method and apparatus for providing pre-travel balancing energy t Method and apparatus for providing pre-travel balancing energy t

1987-11-05

1988-12-27

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

187131, B66B 144

Patent

active

047934425

ABSTRACT:
A method and apparatus for providing pre-travel energy to an electrical elevator drive includes a load cell assembly for sensing the actual suspended weight of an elevator car and its passengers and a microprocessor which utilizes logic subroutines to manipulate this load data and data from a distance tachometer and car mounted sensors. The subroutines include an initializing subroutine which determines the empty car weight and balancing torques at the limits of travel, a normalizing subroutine which normalizes this data and determines the actual weight of the car and passengers and a rope compensation subroutine which calculates the torque required to balance the weight of the cables suspended from the elevator car. From the foregoing data, the microprocessor provides a pre-travel electrical signal to the elevator drive which corresponds to the torque level required to maintain the elevator car stationary during the interval between release of the brake and application of drive pattern power.

REFERENCES:
patent: 1003913 (1911-09-01), Kilcoyne
patent: 1862603 (1932-06-01), McNaught
patent: 2604782 (1952-07-01), Rissler et al.
patent: 2886137 (1959-05-01), Lund et al.
patent: 3244957 (1966-04-01), Spiess et al.
patent: 3486101 (1969-12-01), Rufli
patent: 3847251 (1974-11-01), Maltby et al.

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