Elevator regenerative drive with automatic rescue operation
First Claim
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1. A system for continuously driving an elevator hoist motor during normal and power failure operating conditions, the system comprising:
- a regenerative drive operable to deliver power to the hoist motor from a main power supply during the normal operating condition and from a backup power supply during the power failure operating condition; and
a controller for operating the regenerative drive to provide available power on the regenerative drive to the backup power supply during the normal operating condition;
wherein the regenerative drive comprises a converter connected to a power bus, the converter operable to convert alternating current (AC) power from the main power supply into direct current (DC) power deliverable to the power bus and to step-up DC power at a first voltage from the backup power supply to a second voltage deliverable to the power bus.
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Abstract
A system (10) continuously drives an elevator hoist motor (14) during normal and power failure operating conditions. A regenerative drive (30, 34, 36) delivers power to the hoist motor (14) from a main power supply (17) during the normal operating condition and from a backup power supply (24) during the power failure operating condition. A controller (12) operates the regenerative drive (30, 34, 36) to provide available power on the regenerative drive (30, 34, 36) to the backup power supply (24) during the normal operating condition.
72 Citations
23 Claims
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1. A system for continuously driving an elevator hoist motor during normal and power failure operating conditions, the system comprising:
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a regenerative drive operable to deliver power to the hoist motor from a main power supply during the normal operating condition and from a backup power supply during the power failure operating condition; and a controller for operating the regenerative drive to provide available power on the regenerative drive to the backup power supply during the normal operating condition; wherein the regenerative drive comprises a converter connected to a power bus, the converter operable to convert alternating current (AC) power from the main power supply into direct current (DC) power deliverable to the power bus and to step-up DC power at a first voltage from the backup power supply to a second voltage deliverable to the power bus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for continuously driving an elevator hoist motor, the system comprising:
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a converter operable to convert alternating current (AC) power from a main power supply into direct current (DC) power; an inverter operable to drive the hoist motor by converting the DC power from the converter into AC power and, when the hoist motor is generating, to convert AC power produced by the hoist motor to DC power; a power bus connected between the converter and the inverter to receive DC power from the converter and the inverter; a rescue operation circuit including a backup power supply connected between the main power supply and the converter, wherein the rescue operation circuit is operable to disconnect the main power supply from the converter and connect the backup power supply to the converter in the event of a failure of the main power supply, and wherein the rescue operation circuit is further operable to connect the backup power supply to the main power supply through the converter to charge the backup power supply. - 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, the method comprising:
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connecting a main power supply to a converter in a regenerative drive that drives the elevator hoist motor if the main power supply voltage is within a normal operating range; disconnecting the main power supply from the converter in the regenerative drive and connecting a backup power supply to the converter in the regenerative drive if the main power supply voltage is below the normal operating range; and charging the backup power supply from the main power supply by connecting the main power supply and the backup power supply through the converter in the regenerative drive if the backup power supply voltage is below a threshold voltage. - View Dependent Claims (20, 21, 22, 23)
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Specification