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Design and Analysis of Hybrid Stator Bearingless SRM

  • Lee, Dong-Hee ;
  • Ahn, Jin-Woo
  • Received : 2010.06.03
  • Accepted : 2010.07.30
  • Published : 2011.01.01

Abstract

This paper presents a novel bearingless switched reluctance motor (BLSRM) with decoupled torque and suspending stator poles. BLSRM is different from conventional bearingless switched reluctance motors (SRMs) because its suspending poles are separated from the torque poles. Perpendicularly placed suspending poles are designed to produce a continuous radial force to suspend the rotor. Due to the independent suspending and torque poles, BLSRM produces a suspending force with excellent linearity according to the rotor position and independent characteristics of the torque current. The air-gap is easier to control than in conventional SRMs with their linear and independent characteristics. Furthermore, to verify the proposed structure, a mathematical model for the suspending force is derived. Finite element analysis is also employed to compare BLSRM and conventional SRMs expressions of suspending force. A prototype motoris designed and manufactured to verify the effectiveness of the proposed bearingless structure.

Keywords

SRM;Bearingless structure;Hybrid stator;FEM analysis;Suspending force;Separated poles

References

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  3. Comparative Analysis of Bearingless Switched Reluctance Motors With Decoupled Suspending Force Control vol.51, pp.1, 2015, https://doi.org/10.1109/TIA.2014.2331422
  4. Characteristics Analysis of Segmental Rotor Type 3-Phase SRMs vol.21, pp.1, 2016, https://doi.org/10.6113/TKPE.2016.21.1.1
  5. Design and Analysis of Novel 12/14 Hybrid Pole Type Bearingless Switched Reluctance Motor with Short Flux Path vol.7, pp.5, 2012, https://doi.org/10.5370/JEET.2012.7.5.705
  6. Drive Characteristics of Outer-rotor Type SRM Considering Dual Operating Modes vol.63, pp.7, 2014, https://doi.org/10.5370/KIEE.2014.63.7.903
  7. A Novel Technique for Controlling Speed and Position of Bearingless Switched Reluctance Motor Employing Sensorless Sliding Mode Observer 2017, https://doi.org/10.1007/s13369-017-3027-8
  8. Improved Radial Force Modeling and Rotor Suspension Dynamics Simulation Studies for Double-winding Bearingless Switched Reluctance Motor vol.45, pp.1, 2017, https://doi.org/10.1080/15325008.2016.1236852
  9. Variable speed operation of SRM with dual rating using proper voltage excitation vol.40, pp.4, 2016, https://doi.org/10.5916/jkosme.2016.40.4.348
  10. Design and Analysis of a Segmental Rotor Type 12/8 Switched Reluctance Motor vol.14, pp.5, 2014, https://doi.org/10.6113/JPE.2014.14.5.866
  11. Prototype of 6-DOF Magnetically Levitated Stage Based on Single Axis Lorentz force Actuator vol.11, pp.5, 2016, https://doi.org/10.5370/JEET.2016.11.5.1216

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)