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Motor drive circuit

  • US 8,049,363 B2
  • Filed: 08/15/2006
  • Issued: 11/01/2011
  • Est. Priority Date: 08/16/2005
  • Status: Active Grant
First Claim
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1. A motor circuit comprising:

  • a positive input terminal and a negative input terminal each for connection of the motor circuit to a DC supply;

    a DC link filter connected between said positive input terminal and said negative input terminal;

    an electric motor having at least two phases;

    a plurality of motor drive sub-circuits, each connected to a respective phase of said electric motor through an electrical path and which each motor drive sub-circuit controls a flow of current into or out of said respective phase of said motor that has been drawn from said DC supply through said DC link filter; and

    a switch provided in said electrical path between said DC link filter and said electric motor drive sub-circuits, said switch being movable between a closed position in which it connects said DC link filter to said motor drive sub-circuits, and an open position in which it isolates said DC link filter from said motor drive sub-circuits.

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