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Elevator system including regenerative drive and rescue operation circuit for normal and power failure conditions

  • US 8,146,714 B2
  • Filed: 12/14/2006
  • Issued: 04/03/2012
  • Est. Priority Date: 12/14/2006
  • Status: Active Grant
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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