Interaction and multiscale mechanics

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Design and simulation of resonance based DC current sensor

  • Santhosh Kumar, B.V.M.P. (Department of Instrumentation and Control Engineering, National Institute of Technology) ;
  • Suresh, K. (Department of Instrumentation and Control Engineering, National Institute of Technology) ;
  • Varun Kumar, U. (Department of Instrumentation and Control Engineering, National Institute of Technology) ;
  • Uma, G. (Department of Instrumentation and Control Engineering, National Institute of Technology) ;
  • Umapathy, M. (Department of Instrumentation and Control Engineering, National Institute of Technology)
  • Received : 2010.04.22
  • Accepted : 2010.09.14
  • Published : 2010.09.25
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Abstract

A novel resonance based proximity DC current sensor is proposed. The sensor consists of a piezo sensed and actuated cantilever beam with a permanent magnet mounted at its free end. When the sensor is placed in proximity to a wire carrying DC current, resonant frequency of the beam changes with change in current. This change in resonant frequency is used to determine the current through the wire. The structure is simulated in micro and meso scale using COMSOL Multi physics software and the sensor is found to be linear with good sensitivity.

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References

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