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ELEVATOR BRAKING IN A BATTERY POWERED ELEVATOR SYSTEM

  • US 20160194179A1
  • Filed: 08/13/2013
  • Published: 07/07/2016
  • Est. Priority Date: 08/13/2013
  • Status: Active Grant
First Claim
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1. An elevator system comprising:

  • a battery;

    a machine having a motor to impart motion to an elevator car;

    an inverter having a plurality of switches to convert DC power from the battery to AC power for the machine in a motoring mode;

    a speed sensor coupled to the machine, the speed sensor to generate a speed signal indicative of machine speed; and

    a controller to apply braking signals to a group of the switches in a braking mode, the braking signals having a duty cycle in response to the speed signal.

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