Elevator system including regenerative drive and rescue operation circuit for normal and power failure conditions
First Claim
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1. A system for continuously driving an elevator hoist motor during normal and power failure conditions, the system comprising:
- a regenerative drive for delivering power to the hoist motor, the regenerative drive having inputs for receiving power from a main power supply during normal operation; and
a rescue operation circuit including a backup power supply that is operable in the event of a failure of the main power supply to simultaneously disconnect the inputs of the regenerative drive from the main power supply and connect the backup power supply to the inputs of the regenerative drive to supply DC power to the inputs.
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Abstract
A system continuously drives an elevator hoist motor during normal and power failure conditions. A regenerative drive delivers power from a main power supply to the hoist motor during normal operation. A rescue operation circuit includes a backup power supply and is operable in the event of a failure of the main power supply to disconnect the regenerative drive from the main power supply and connect the back up power supply to the regenerative drive to provide substantially uninterrupted power to the hoist motor.
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Citations
24 Claims
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1. A system for continuously driving an elevator hoist motor during normal and power failure conditions, the system comprising:
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a regenerative drive for delivering power to the hoist motor, the regenerative drive having inputs for receiving power from a main power supply during normal operation; and a rescue operation circuit including a backup power supply that is operable in the event of a failure of the main power supply to simultaneously disconnect the inputs of the regenerative drive from the main power supply and connect the backup power supply to the inputs of the regenerative drive to supply DC power to the inputs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An elevator drive system comprising:
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a regenerative drive having outputs connected to an elevator hoist motor and having inputs connected to a main power supply of AC power by a first set of switches and a backup power supply of DC power by a second set of switches; a voltage sensor for measuring a main power supply voltage; and a controller for closing the first set of switches and opening the second set of switches if the measured main power supply voltage is within a normal operating range, and for opening the first set of switches and closing the second set of switches if the measured main power supply voltage is below the normal operating range. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A method for providing substantially uninterrupted power to an elevator hoist motor during normal and power failure conditions of a main power supply, the method comprising:
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measuring a main power supply voltage; connecting the main power supply to inputs of a regenerative drive that drives the elevator hoist motor if the measured main power supply voltage is within a normal operating range; and disconnecting the main power supply from the inputs of the regenerative drive and connecting a backup power supply to the inputs of the regenerative drive if the measured main power supply voltage is below the normal operating range, wherein the main power supply provides AC power to the inputs, and the backup power supply provides DC power to the inputs. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification