Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1982-12-01
1985-03-12
Shoop, 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 132
Patent
active
045039372
ABSTRACT:
The present invention relates to a control circuit for a low inertia elevator system which utilizes an AC motor in conjunction with an eddy current brake to control the elevator car position. The control circuit includes a pattern generator for generating a pattern signal to a motoring gain amplifier and a braking gain amplifier. The pattern signal represents the desired speed of the car and includes an acceleration portion, a full speed portion, and a deceleration portion. The motoring gain amplifier and the braking gain amplifier are responsive to the pattern signal and a tach signal representing the actual speed of the car for controlling the AC motor and the eddy current brake respectively. In order to minimize the bump when the car enters the deceleration pattern, the pattern generator sets the initial level of the deceleration pattern at a value which is a function of the level of the tach signal at that time. The control circuit also includes a sensing circuit for determining whether the car is in an overhauling condition. If an overhauling condition is detected, the response time of the braking gain amplifier is increased during deceleration in order to permit the motoring gain to fall off more rapidly. This results in a smoother deceleration run along with reduced power consumption.
REFERENCES:
patent: 4034856 (1977-07-01), Wehrli et al.
patent: 4083431 (1978-04-01), Oohira et al.
patent: 4084662 (1978-04-01), Tezuka et al.
Cervenec Stephen W.
Stender Ronald L.
Duncanson Jr. W. E.
Schindler Haughton Elevator Corporation
Shoop William M.
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