Elevator – industrial lift truck – or stationary lift for vehicle – Having specific load support drive-means or its control – Includes control for power source of drive-means
Patent
1996-09-27
1998-07-14
Nappi, Robert
Elevator, industrial lift truck, or stationary lift for vehicle
Having specific load support drive-means or its control
Includes control for power source of drive-means
187281, 187393, B66B 514, B66B 128, B66B 134
Patent
active
057807868
ABSTRACT:
A control apparatus for use in an elevator is constructed in a compact and low-cost design without degrading the quality of service of the elevator by minimizing the current flowing through a hoisting motor. The control apparatus includes a load sensor and a speed command generator. The speed command generator alters acceleration and deceleration according to an elevator car net load and the direction of run by setting both the acceleration during acceleration phase and the deceleration during deceleration phase to be a first acceleration when the car net load is within a normal load region, setting the acceleration to be a second acceleration that is lower than the first acceleration and the deceleration to be a third acceleration that is higher than the first acceleration when the car is in a lower operation with the car net load in a light load region, setting the acceleration to be the third acceleration and the deceleration to be the second acceleration when the car is in a raise operation with the car net load being within the light load region, setting the acceleration to be the second acceleration and the deceleration to be the third acceleration when the car is in the raise operation with the car net load being within a heavy load region, and setting the acceleration to be the third acceleration and the deceleration to be the second acceleration when the car is in the lower operation with the car net load being within the heavy load region.
REFERENCES:
patent: 3735221 (1973-05-01), Bell et al.
patent: 4155426 (1979-05-01), Booker, Jr.
patent: 5229558 (1993-07-01), Hakala
patent: 5266757 (1993-11-01), Krapek et al.
Mitsubishi Denki & Kabushiki Kaisha
Nappi Robert
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