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Rotation sensor

  • US 4,275,291 A
  • Filed: 08/21/1978
  • Issued: 06/23/1981
  • Est. Priority Date: 08/21/1978
  • Status: Expired due to Term
First Claim
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1. Flow measuring apparatus comprising means for defining a fluid-flow passage and including a non-magnetic wall, a flow-activated rotor in said passage bearing first rotary means opposite to said nonmagnetic wall, second rotary means outside said wall coaxial with said first rotary means, said first and second rotary means having first and second localized portions, respectively, of magnetic material opposite each other and a said localized portion of at least one of said rotary means being magnetized for causing the first and second rotary means to rotate in unison, said first and second localized portions staying opposite each other and moving in respective mutually opposite circular paths, a detector that yields changing electrical output in response to changes in imposed magnetic field, said detector being disposed outside said wall between said circular paths for providing a succession of signals proportional to the number of rotations of said flow-activated rotor, and means for indicating a measure of the rotation of rotary device, said last-named means being coupled to said detector and responsive thereto.

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