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Method and apparatus for layer short detection of electric rotating machine

  • US 7,772,870 B2
  • Filed: 08/09/2007
  • Issued: 08/10/2010
  • Est. Priority Date: 09/27/2006
  • Status: Expired due to Fees
First Claim
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1. An electric rotating machine, for detecting a layer short of a field winding by measuring a leakage flux generated from the field winding, wherein the electric rotating machine includes a rotor shaft, a bearing rotatably supporting the rotor shaft, a rotor iron core mounted on the rotor shaft and wound by the field winding to generate a magnetic flux including the leakage flux, and a stator iron core facing to the rotor iron core with a gap therebetween to generate a magnetic force between the rotor iron core and the stator iron core, and wherein the electric rotating machine further includes a magnetically permeable member having a first part facing closely to the rotor shaft and a second part contacting the stator iron core to enable the leakage flux to pass through the magnetically permeable member,wherein the field winding generates the magnetic flux, including the leakage flux, flowing inside and outside the electric rotating machine,wherein the leakage flux flows from the field winding inside the electric rotating machine to the magnetically permeable member outside the electric rotating machine, andwherein a field detector installed outside the electric rotating machine where the leakage flux from the field winding flows, detects the leakage flux passing through the magnetically permeable member, and measures outside the electric rotating machine the leakage flux of the field winding in operation to detect a layer short of the field winding by detecting the increase in the leakage flux or asymmetry of waveform of the leakage flux resulting from the layer short and passing through the magnetically permeable member.

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