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Means and method of sensing motor rotation speed from stray escaping flux

  • US 4,495,448 A
  • Filed: 11/06/1981
  • Issued: 01/22/1985
  • Est. Priority Date: 11/06/1981
  • Status: Expired due to Fees
First Claim
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1. The method of deriving an electrical signal varying in characteristic as a function of the operational characteristics of a motor with electromagnetic stator and rotor windings comprising the steps of,operating the motor under rated conditions from a specified line power source,picking up signals from the stray magnetic flux field escaping from the motor stator and rotor interaction without requiring motor modifications for the purpose of providing a signal by placing an electromagnetic sensor responsive to the escaping magnetic flux within said field to sense the flux without any conductive or mechanical connections to the motor,

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