Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1977-04-29
1978-09-26
Schaefer, Robert K.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
B66B 130
Patent
active
041163060
ABSTRACT:
A generator, hoist motor, and hoist motor brake for controlling the drive of an elevator car in a hoistway in accordance with speed and direction inputs. A generator-motor-brake unit is powered by an AC power source and also receives the speed and direction inputs. The speed and direction inputs are converted to elevator car command signals. A master waveform generator receives the AC power signal and provides a precise waveform synchronous with the AC power signal. The precise waveform and command signals are connected to a number of comparator triggers which provide a generator field trigger signal, a motor field trigger signal, and as hoist motor brake trigger signal. The trigger signals are each connected to individual power metering elements connected between the AC power source and each of the generator and motor fields, and the hoist motor brake. Power is thereby metered to the generator field, the motor field, and the hoist motor brake in accordance with the speed and direction inputs. When the generator is driven rotationally and the generator field is excited, the generator produces an output which is connected to the motor winding. The polarity of the generator output dictates the direction of rotation of the motor when the motor field is excited. The hoist motor brake is disengaged by the metered power while the elevator car is in motion and engages the motor shaft to fix the car in position in the hoist way when the motor is stopped.
REFERENCES:
patent: 3250972 (1966-05-01), Morris
patent: 3297110 (1967-01-01), Bagnasco
patent: 3379285 (1968-04-01), Leitz
patent: 3741348 (1973-06-01), Caputo
patent: 3902572 (1975-09-01), Ostrander
Duncanson Jr. W. E.
Elevator Industries
Schaefer Robert K.
LandOfFree
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