Optimal Design of 50kW Concentrated Winding Bearingless Motor

Ye Gu Kang, Eric L. Severson

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

11 Scopus citations

Abstract

Bearingless motor technology offers an integrated and compact alternative to active magnetic bearings for developing contact-free and oil-free industrial compressor systems. These systems require high speed motors designed for significant power levels. This paper considers the optimal design of a 50kW, 30,000 r/min bearingless motor. This design is based around a topology with a fractional slot-concentrated winding and a surface mount permanent magnet motor (the popular 4-pole, 6-slot design), making it a practical and potentially cost-effective design to manufacture. A parallel no voltage combined winding is designed so that the same coils that create torque can also be used to create suspension forces. The rotor magnets are retained via a carbon fiber banding, which is designed within the proposed optimization process. A multi-physics design framework is developed based around the differential evolution algorithm that considers both the electromagnetic design and the structural integrity of the rotor. Design metrics unique to bearingless motors are described and implemented. The final design achieves a maximum efficiency of nearly 96%, a safety factor of approximately 2 in the rotor structural analysis, and is able to support the rotor weight with only 2.5% of the rated armature current.

Original languageEnglish
Title of host publication2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages4411-4418
Number of pages8
ISBN (Electronic)9781479973118
DOIs
StatePublished - 3 Dec 2018
Event10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018 - Portland, United States
Duration: 23 Sep 201827 Sep 2018

Publication series

Name2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018

Conference

Conference10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018
Country/TerritoryUnited States
CityPortland
Period23/09/1827/09/18

Keywords

  • Bearingless motor
  • Differential evolution
  • Magnetic levitation
  • Multi-Physics
  • Optimization
  • Self-bearing motor

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