ELEVATOR CAR SPEED CONTROL IN A BATTERY POWERED ELEVATOR SYSTEM
First Claim
1. An elevator system comprising:
- a battery;
a machine having a motor for imparting motion to an elevator car;
an inverter for converting DC power from the battery to AC power for the machine in motoring mode and converting AC power from the machine to DC power for the battery in regenerative mode; and
a controller to control the inverter, the controller implementing at least one of;
detecting an overload at the battery in motoring mode and reducing car speed in response to the overload;
detecting an overcharge at the battery in regenerative mode and reducing car speed in response to the overcharge;
detecting motor direct current in a motor field weakening mode and reducing car speed in response to the motor direct current; and
detecting car load and adjusting car speed in response to car load.
1 Assignment
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Accused Products
Abstract
An elevator system includes a battery; a machine having a motor for imparting motion to an elevator car; an inverter for converting DC power from the battery to AC power for the machine in motoring mode and converting AC power from the machine to DC power for the battery in regenerative mode; and a controller to control the inverter, the controller implementing at least one of: detecting an overload at the battery in motoring mode and reducing car speed in response to the overload; detecting an overcharge at the battery in regenerative mode and reducing car speed in response to the overcharge; detecting motor direct current in a motor field weakening mode and reducing car speed in response to the motor direct current; and detecting car load and adjusting car speed in response to car load.
31 Citations
17 Claims
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1. An elevator system comprising:
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a battery; a machine having a motor for imparting motion to an elevator car; an inverter for converting DC power from the battery to AC power for the machine in motoring mode and converting AC power from the machine to DC power for the battery in regenerative mode; and a controller to control the inverter, the controller implementing at least one of; detecting an overload at the battery in motoring mode and reducing car speed in response to the overload; detecting an overcharge at the battery in regenerative mode and reducing car speed in response to the overcharge; detecting motor direct current in a motor field weakening mode and reducing car speed in response to the motor direct current; and detecting car load and adjusting car speed in response to car load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification