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Electromagnetic torque measuring instrumentation for a rotating shaft

  • US 4,444,064 A
  • Filed: 06/14/1982
  • Issued: 04/24/1984
  • Est. Priority Date: 06/14/1982
  • Status: Expired due to Term
First Claim
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1. Torque monitoring instrumentation for continuously measuring torque between first and second axially separate locations on a rotating shaft, comprising:

  • first and second electromagnetic probes fixed with respect to said shaft and located in proximity to the surface thereof at said first and second locations, respectively, said first and second probes being operable in a first mode to induce a fixed circumferential magnetic pattern on to the surface of said shaft at said first and second locations, respectively, and being operable in a second mode to produce first and second output signals, respectively, in response to the movement of said magnetic patterns as said shaft is rotating, said first and second output signals each having a frequency indicative of the instantaneous angular velocity of said shaft at said first and second locations, respectively;

    switching means operable to switch said first and second probes between said first and second modes;

    excitation means for generating an excitation signal and for supplying said signal to said first and second probes in said first mode to cause said probes to induce said fixed circumferential magnetic patterns, said excitation means including means for synchronizing the frequency of said excitation signal with shaft speed so that said fixed circumferential magnetic pattern is invariant with shaft speed in said first mode; and

    phase detection means operable in combination with said first and second probes in said second mode to receive said first and second output signals and to produce a phase signal indicative of the phase relationship between said first and second output signals, said phase relationship being indicative of the torque on said shaft between said first and second locations.

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