B - Operations – Transporting – 66 – B
Patent
B - Operations, Transporting
66
B
364/34
B66B 1/28 (2006.01) B66B 1/30 (2006.01) H02P 23/06 (2006.01)
Patent
CA 1200937
Elevator Car Load and Position Dynamic Gain Compensation 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 fre- quency and amplitude of the power supplied to the motor in order to control the motor's speed, accel- eration, and slip. That inverter control is accom- plished 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 posi- tive 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.
438727
Gowling Lafleur Henderson Llp
Otis Elevator Company
LandOfFree
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