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A Novel Single-Excitation Capacitive Angular Position Sensor Design.

Bo Hou1, Bin Zhou2, Mingliang Song3

  • 1Engineering Research Center for Navigation Technology, Department of Precision Instrument, Tsinghua University, Beijing 100084, China. houb15@mails.tsinghua.edu.cn.

Sensors (Basel, Switzerland)
|August 3, 2016
PubMed
Summary
This summary is machine-generated.

This study introduces a high-precision capacitive angular position sensor (CAPS) that uses a single excitation voltage. The novel CAPS design achieves high accuracy and resolution for precise angular measurements at a low cost.

Keywords:
amplitude modulationangular position sensorcapacitance sensitivesingle-excitationsinusoidal circular electrodes

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Area of Science:

  • Electrical Engineering
  • Sensor Technology
  • Measurement Science

Background:

  • Traditional angular position sensors often suffer from matching errors due to multi-excitations.
  • There is a need for high-precision, low-cost angular sensing solutions in various applications.

Purpose of the Study:

  • To present a novel high-precision capacitive angular position sensor (CAPS).
  • To demonstrate the sensor's capability for accurate and high-resolution angular measurements.
  • To highlight the cost-effectiveness and potential applications of the developed CAPS.

Main Methods:

  • The CAPS utilizes petal-form sinusoidal electrodes for encoding angular position into amplitude-modulated signals.
  • A single voltage excitation is employed to eliminate multi-excitation matching errors.
  • Resolver demodulation techniques are used for digital decoding of the angular position.

Main Results:

  • A prototype CAPS achieved an accuracy of 0.0036°.
  • The sensor demonstrated a resolution of 0.0009°.
  • Nonlinearity was measured at 0.008° after compensation over the full range.

Conclusions:

  • The developed CAPS offers high precision and resolution in angular position sensing.
  • The single excitation voltage design simplifies the system and reduces errors.
  • The CAPS presents a promising, low-cost solution for high-precision applications.