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Rotational Speed Measurement Based on LC Wireless Sensors.

Yi Zhou1, Lei Dong1, Chi Zhang1

  • 1Key Laboratory of MEMS of the Ministry of Education, Southeast University, Nanjing 210096, China.

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Summary
This summary is machine-generated.

This study introduces a wireless rotational speed detection method using inductor-capacitor (LC) sensors. The system accurately measures speed by analyzing signal peaks generated from mutual coupling during rotation.

Keywords:
LC sensorinductive couplingrotational speedwireless sensor

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Area of Science:

  • Electrical Engineering
  • Sensor Technology
  • Wireless Communication

Background:

  • Traditional rotational speed sensors can be complex or require physical connections.
  • Wireless sensing offers advantages in environments where wiring is challenging.

Purpose of the Study:

  • To develop and validate a wireless method for detecting rotational speed using inductor-capacitor (LC) resonant tanks.
  • To demonstrate the feasibility of using mutual coupling between LC tanks for speed measurement.

Main Methods:

  • The proposed system utilizes two identical LC resonant tanks, one on the rotating component and one in the readout circuit.
  • Maximum mutual coupling, indicated by a peak amplitude in the readout LC tank, is achieved during coaxial alignment.
  • Advanced Design System (ADS) software was employed for simulation and optimization, alongside a synchronous detection circuit.

Main Results:

  • Experimental validation was performed on an electric motor's rotational speed.
  • The method demonstrated accurate measurements within a range of 16 to 41 rotations per second (rps).
  • The maximum error observed in the rotational speed measurements was 0.279 rps.

Conclusions:

  • The developed wireless LC sensor system provides an effective and accurate means for rotational speed detection.
  • The correlation between signal peak periods and rotational speed is confirmed.
  • This wireless sensing approach offers a practical solution for monitoring rotational dynamics in various applications.