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Method for determining the short-circuit inductance of an asynchronous machine

  • US 5,477,162 A
  • Filed: 08/24/1994
  • Issued: 12/19/1995
  • Est. Priority Date: 01/09/1992
  • Status: Expired due to Fees
First Claim
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1. Method of determining an instantaneous short circuit inductance in an asynchronous machine during operation thereof, comprising the steps of:

  • measuring a first stator voltage value and a first stator current derivative value;

    generating a step change in the stator voltage immediately after the measurement of said first stator voltage value and the measurement of said first stator current value;

    measuring a second stator voltage value and a second stator current derivative value immediately after said step change in the stator voltage;

    determining the difference between the first and the second stator voltage values and the first and the second stator current derivative values, respectively, anddetermining the instantaneous short circuit inductance by forming the quotient of the difference of said first and second stator voltage values and the difference of said first and second stator current derivative values.

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