×

Method and apparatus for detection of brush sparking and spark erosion on electrical machines

  • US 7,649,470 B2
  • Filed: 03/10/2005
  • Issued: 01/19/2010
  • Est. Priority Date: 09/10/2002
  • Status: Active Grant
First Claim
Patent Images

1. A method for detection of spark activity in an electrical machine having a shaft, the method comprising:

  • measuring at least one of a shaft voltage and a shaft current so as to obtain a measured signal;

    performing an analysis of the measured signal using an analysis unit;

    detecting the spark activity based on the analysis;

    tapping off at least one of the shaft voltage and the shaft current using a low-impedance ground connected to the shaft via a contact apparatus and connected to ground, the low-impedance ground including a low resistance connected to the contact apparatus, a high resistance connected to the ground, and a fuse disposed in parallel with the high resistance so as to provide a tapped off signal; and

    sending the tapped off signal to the analysis unit for analysis.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×