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Method for monitoring the radial gap between the rotor and the stator of electric generators and device for carrying out said method

  • US 20030011397A1
  • Filed: 06/20/2002
  • Published: 01/16/2003
  • Est. Priority Date: 12/20/1999
  • Status: Abandoned Application
First Claim
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1. A method for monitoring the radial gap (10) between the rotor (6) and the stator (8) of an electrical machine, characterized by the following steps:

  • a) influencing variables (80) which govern the operating state are in each case recorded, basic measurements are carried out, and basic reference characteristic variables for the intact air gap geometry measured in the respective operating state are formed in advance for various defined operating states;

    b) during subsequent operation, the size of the radial gap (10) is recorded at a number of measurement points, which are distributed around the circumference of the machine, and at least one instantaneous influencing variable (80) of the instantaneous operating state is recorded;

    c) the variables (100), (80) obtained in step b) are used to form instantaneous characteristic variables (120), and the basic reference characteristic variables obtained in step a) are used to form instantaneous reference characteristic variables, which correspond to an intact air gap for the instantaneous values of the influencing variables (80);

    d) at least the instantaneous characteristic variables (120) obtained in step c) are compared with the corresponding instantaneous reference characteristic variables of the radial gap; and

    if at least one of the instantaneous characteristic variables (120) differs from the reference characteristic variable by more than a specified amount, a warning is produced.

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