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Motor disconnect arrangement for a variable speed drive

  • US 7,193,826 B2
  • Filed: 02/27/2004
  • Issued: 03/20/2007
  • Est. Priority Date: 02/27/2004
  • Status: Active Grant
First Claim
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1. A drive system for a plurality of motors comprising:

  • a variable speed drive, the variable speed drive comprising;

    a converter stage to convert an input AC voltage to a DC voltage, the converter stage being configured to be electrically connectable to an AC power source;

    a DC link stage to filter and store energy from the converter stage, the DC link stage being electrically connected to the converter stage;

    an inverter stage comprising a plurality of inverters electrically connected in parallel to the DC link stage, each inverter of the plurality of inverters being configured to convert a DC voltage to an output AC voltage to power a corresponding motor of a plurality of motors, and each inverter of the plurality of inverters being configured to operate substantially independently of other inverters of the plurality of inverters; and

    wherein the converter stage is configured to provide a boosted DC voltage to the DC link stage and each inverter of the plurality of inverters is configured to provide an output AC voltage greater than the input AC voltage; and

    a plurality of connecting mechanisms, each connecting mechanism of the plurality of connecting mechanisms being connected in series between an inverter of the plurality of inverters and a corresponding motor of the plurality of motors, and wherein each connecting mechanism being configured to disconnect an inverter from a corresponding motor in response to receiving a control signal.

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