Elevator Power System
First Claim
1. A power system for operating a plurality of hoist motors, each hoist motor for controlling movement of one of a plurality of elevators, the power system comprising:
- a power bus;
a converter connected across the power bus for converting alternating current (AC) power from an AC power source to direct current (DC) power and delivering the DC power to the power bus;
a plurality of inverters connected across the power bus, each inverter connected to a hoist motor and operable to drive the hoist motor when the hoist motor is motoring by converting the DC power from the power bus into AC power, each inverter further operable to convert AC power produced by the hoist motor when the motor is generating DC power and to deliver the DC power to the power bus; and
a controller for managing power on the power bus by controlling operation of the converter and the inverters to drive a motoring hoist motor with power provided to the power bus by the converter and generating hoist motors.
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Accused Products
Abstract
A power system (10) operates a plurality of hoist motors (18a, 18b, 18c), each of which controls movement of one of a plurality of elevators (12a, 12b, 12c). The power system (10) includes a power bus (11) and a converter (22) connected across the power bus (11) for converting alternating current (AC) power from an AC power source (20) to direct current (DC) power and delivering the DC power to the power bus (11). The power system (10) also includes a plurality of inverters (26a, 26b, 26c) connected across the power bus (11). Each inverter (26a, 26b, 26c) is connected to a hoist motor (18a, 18b, 18c) and is operable to drive the hoist motor (18a, 18b, 18c) when the hoist motor (18a, 18b, 18c) is motoring by converting the DC power from the power bus (11) into AC power. Each inverter (26a, 26b, 26c) is further operable to convert AC power produced by the hoist motor (18a, 18b, 18c) when the motor is generating to DC power and to deliver the DC power to the power bus (11). A controller (31) manages power on the power bus (11) by controlling operation of the converter (22) and the inverters (26a, 26b, 26c) to drive a motoring hoist motor with power delivered to the power bus (11) by the converter (22) and generating hoist motors.
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Citations
20 Claims
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1. A power system for operating a plurality of hoist motors, each hoist motor for controlling movement of one of a plurality of elevators, the power system comprising:
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a power bus; a converter connected across the power bus for converting alternating current (AC) power from an AC power source to direct current (DC) power and delivering the DC power to the power bus; a plurality of inverters connected across the power bus, each inverter connected to a hoist motor and operable to drive the hoist motor when the hoist motor is motoring by converting the DC power from the power bus into AC power, each inverter further operable to convert AC power produced by the hoist motor when the motor is generating DC power and to deliver the DC power to the power bus; and a controller for managing power on the power bus by controlling operation of the converter and the inverters to drive a motoring hoist motor with power provided to the power bus by the converter and generating hoist motors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A power system for operating a plurality of hoist motors, each hoist motor for controlling movement of one of a plurality of elevators, the power system comprising:
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a direct current (DC) power bus; a power source connected to the DC power bus; a plurality of inverters, each inverter connected between the DC power bus and one of the plurality of hoist motors; and a controller for operating each inverter to deliver electrical energy from the DC power bus to a hoist motor when the hoist motor is operating as a motor and to deliver regenerated electrical energy from the hoist motor to the DC power bus when the hoist motor is operating as a generator. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method for operating a plurality of hoist motors connected to a common power bus, each hoist motor for controlling movement of one of a plurality of elevators, the method comprising:
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delivering electrical energy generated by a generating hoist motor to the common power bus; delivering electrical energy from the common power bus to a motoring hoist motor; and controlling dispatching of the elevators based on power demands of the hoist motors. - View Dependent Claims (18, 19, 20)
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Specification