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Monitoring the bearing temperature of an electrical machine

  • US 7,652,587 B2
  • Filed: 01/31/2006
  • Issued: 01/26/2010
  • Est. Priority Date: 02/02/2005
  • Status: Expired due to Fees
First Claim
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1. A method for monitoring a temperature of at least one bearing of an electric machine which has a plurality of machine components, comprising the steps of:

  • defining a temperature model for the machine,simulating thermal conditions in the electric machine based on a multiple-mass model,continuously measuring an electric current in the electric machine and supplying the measured electric current as an input variable for the temperature model,continuously measuring a rotation speed of the electric machine as an input variable for the temperature model,deriving from the temperature model at least one calculated bearing power loss, which corresponds to a temperature of a bearing or a temperature of a bearing inner ring,emitting a first warning message if the calculated bearing power loss is greater than a predetermined comparison value, oremitting a second warning message if a calculated temperature difference between a bearing inner ring and an associated bearing outer ring exceeds a predetermined temperature difference, or both.

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