New Three-Pole Combined Radial-Axial Magnetic Bearing for Industrial Bearingless Motor Systems

This article investigates combined radial-axial magneticbearing (CRAMB) technology as an enabling component for shafted bearingless motor systems. The unique requirements of high-speed bearingless motors designed for significant power levels are used to guide a literature review on CRAMB designs. Fu...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2021-11, Vol.57 (6), p.6754-6764
Main Authors: Hemenway, Nicholas R., Gjemdal, Henrik, Severson, Eric L.
Format: Article
Language:English
Subjects:
Bearingless motor
Bibliographies
Design
FEA
Finite element method
Force
high speed
Inverters
Literature reviews
magnetic bearing
Magnetic bearings
Magnetic levitation
magnetic suspension
Rotor dynamics
Shafts
Stators
Switches
Topology
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Summary:This article investigates combined radial-axial magneticbearing (CRAMB) technology as an enabling component for shafted bearingless motor systems. The unique requirements of high-speed bearingless motors designed for significant power levels are used to guide a literature review on CRAMB designs. Fundamental bearing topology aspects are identified and compared. Based on the outcome of this review, a new CRAMB topology is proposed and developed to meet the needs of a bearingless motor. Key features of the proposed design include a three-pole radial force stage (driven by a three-phase motor drive) and utilization of an optimal bias flux that improves radial force density by approximately 15% (improved rotor dynamics). A full design procedure for the new bearing topology is developed and it is shown that compared to a conventional four-pole side-by-side CRAMB, this topology decreases the bearing shaft length and requires two fewer power electronic switches (6 instead of 8). The new bearing is validated via finite-element analysis and experimental test results.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2021.3068089