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A 6-DoF position sensor for bearingless slice motors.

Krishan Kant1, David L Trumper2

  • 1Electrical Engineering and Computer Science Department, Massachusetts Institute of Technology, Cambridge, 02139, USA.

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|June 17, 2024
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Summary

A novel six degrees of freedom (DoF) position sensor for bearingless slice motors was developed. This eddy current sensor enables precise rotor control, achieving high resolution for critical radial measurements.

Keywords:
Levitated slice motoreddy current sensorsinductive sensorposition sensorsynchronous demodulation

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Area of Science:

  • Mechanical Engineering
  • Electrical Engineering
  • Sensor Technology

Background:

  • Bearingless motors require precise rotor position sensing for active control.
  • Existing sensors may have limitations in space constraints and measurement capabilities.
  • Integration of sensing within compact motor designs is a key challenge.

Purpose of the Study:

  • To design and demonstrate a compact six degrees of freedom (DoF) position sensor for bearingless slice motors.
  • To enable advanced active control of the rotor by providing comprehensive positional data.
  • To develop a sensor that fits entirely under the rotor, optimizing packaging.

Main Methods:

  • Utilized eddy current principles for non-contact position sensing.
  • Developed a two-part sensor to measure radial, axial, angular, and tip/tilt DoF.
  • Employed a conductive target on the rotor's underside to modulate magnetic fields.
  • Implemented signal processing techniques for accurate measurement extraction.

Main Results:

  • Achieved a resolution of for critical radial DoF measurements.
  • Attained a bandwidth of 1 kHz for dynamic rotor position monitoring.
  • Successfully demonstrated the sensor's capability to measure six DoF.
  • Presented the design, fabrication, and signal processing of the sensor.

Conclusions:

  • The developed eddy current sensor effectively measures six DoF for bearingless slice motors.
  • The sensor's compact design facilitates integration and enables advanced active control.
  • High-resolution radial measurements are crucial for stable rotor levitation in bearingless applications.