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Testing inverter driven electric motor shut-off path

  • US 7,545,111 B2
  • Filed: 12/22/2006
  • Issued: 06/09/2009
  • Est. Priority Date: 12/22/2006
  • Status: Active Grant
First Claim
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1. A method of testing automotive vehicle electric traction motor shut-off paths, the method comprising the steps of:

  • providing a three-phase electric motor having at least one shut-off path that is an electric traction motor of an automotive vehicle, a source of electric current, a current injection circuit connected to the source of electric current and to the three-phase electric motor, and current measurement circuitry and electrical communication with the three-phase electrical motor;

    injecting current into the three-phase electric motor;

    applying at least one of a short or an open to the three-phase electric motor for a predetermined length of time;

    calculating a rate of decay of the current;

    comparing the rate of decay wit predetermined decay criteria; and

    determining that testing of the at least one shut-off path of the three-phase electric motor has passed if the rate of decay meets the predetermined decay criteria and that the at least one shut-off path has failed if the rate of decay does not meet the predetermined decay criteria.

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