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Position Sensors for Industrial Applications Based on Electromagnetic Encoders.

Ferran Paredes1, Cristian Herrojo1, Ferran Martín1

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This study introduces novel electromagnetic encoders for precise linear and angular measurement, functioning similarly to optical encoders but using electromagnetic signals. These new encoders offer accurate position and velocity tracking, with potential for quasi-absolute positioning using additive manufacturing techniques.

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Area of Science:

  • Measurement Science
  • Electromagnetism
  • Materials Science

Background:

  • Traditional optical and magnetic encoders are industry standards for displacement and velocity measurement.
  • Existing encoder technologies have limitations that drive the need for alternative solutions.

Purpose of the Study:

  • To propose and investigate a novel electromagnetic encoder system for linear and rotary measurements.
  • To demonstrate the feasibility of implementing electromagnetic encoders using various materials and manufacturing processes.

Main Methods:

  • Utilized a transmission line structure (stator) perturbed by a chain of inclusions (metallic, dielectric, or apertures) on a substrate.
  • Analyzed amplitude modulation of a harmonic signal by the encoder chain to extract position and velocity information.
  • Investigated linear encoders with metallic and dielectric inclusions, including additive manufacturing prototypes.

Main Results:

  • Electromagnetic encoders successfully measure linear/angular displacements and velocities via pulse counting principles.
  • The envelope function of the modulated harmonic signal accurately encodes position and velocity data.
  • Demonstrated the potential for synchronous electromagnetic encoders to provide quasi-absolute position, velocity, and direction.

Conclusions:

  • Electromagnetic encoders present a viable alternative to traditional optical and magnetic systems.
  • Additive manufacturing techniques like 3D printing and screen printing are suitable for fabricating these novel encoders.
  • The developed electromagnetic encoder technology offers accurate and potentially quasi-absolute position sensing capabilities.