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Temperature compensating device for torque measuring apparatus

  • US 5,307,690 A
  • Filed: 07/27/1992
  • Issued: 05/03/1994
  • Est. Priority Date: 07/29/1991
  • Status: Expired due to Term
First Claim
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1. A temperature compensating device for a torque measuring apparatus of the magneto-strictive type including a magnetically anisotropic portion formed on the periphery of a torque transmission shaft, and sensing coil means provided in corresponding relation to the magnetically anisotropic portion for outputting an alternating current signal corresponding to the magnitude of a torque applied to the torque transmission shaft from the sensing coil means for measurement of the magnitude of the torque, said temperature compensating device comprising:

  • means for detecting the direct current resistance of said sensing coil means thereby to detect the temperature of said sensing coil means,means for temperature-compensating the detecting characteristics of said torque measuring apparatus on the basis of a detection signal from said detecting means,voltage division resistor means for applying a DC voltage to the sensing coil meansmeans for detecting the direct current component only of the terminal voltage of the sensing coil means thereby to find the DC resistance of the sensing coil means, andmeans for deriving an alternating current component only out of an output signal from the sensing coil means thereby to provide a torque detection signal.

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