Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1982-10-12
1985-02-26
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
318803, B66B 130
Patent
active
045013438
ABSTRACT:
A polyphase induction motor propels an elevator car. The motor is powered by a multiphase inverter which receives power from a battery. The inverter is controlled in such a way as to control the frequency and amplitude of the power supplied to the motor in order to control the motor's speed, acceleration, and slip. That inverter control is accomplished by sensing the motor's speed and in response providing predetermined slip and torque signals. The slip can be controlled over a range which can provide negative slip, by which power is regenerated into the battery, which is thereby charged, and positive slip for motoring torque. A charger also charges the battery. The motor and its controls are thereby ostensibly isolated from the power system that supplies power to the charger, the battery handling the peak power requirements. Loop gain is adjustable in relation to cab loading, and offsets are applied within the loop to adjust the production of the slip and torque signal to reflect cab load and to modify car motion as the car is slowed when approaching the floor for a stop.
REFERENCES:
patent: 4319665 (1982-03-01), Komuro et al.
patent: 4327315 (1982-04-01), Kawada et al.
patent: 4376471 (1983-03-01), Uchino et al.
Duncanson Jr. W. E.
Greenstein Robert E.
Otis Elevator Company
Shoop William M.
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