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Stresses of an AMB-Supported Rotor Arising From the Sudden Contact With Backup Bearings

[+] Author Affiliations
Eerik Sikanen, Oskari Halminen, Janne Heikkinen, Jussi Sopanen, Aki Mikkola, Marko Matikainen

Lappeenranta University of Technology, Lappeenranta, Finland

Paper No. IMECE2015-51373, pp. V04AT04A039; 8 pages
doi:10.1115/IMECE2015-51373
From:
  • ASME 2015 International Mechanical Engineering Congress and Exposition
  • Volume 4A: Dynamics, Vibration, and Control
  • Houston, Texas, USA, November 13–19, 2015
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5739-7
  • Copyright © 2015 by ASME

abstract

High speed technology has a fundamental advantage when compared to conventional motors. Active magnetic bearings (AMBs) are often needed in the high speed motors, as they can provide almost frictionless support and allowing control for the dynamics of the system. AMBs require backup bearings to avoid damage resulting from a failure in the component itself, in the power system, or in the control system. During a rotor-bearing contact event, substantial impact forces may occur between the backup bearing and the rotor.

In this study the rotor model is implemented using a finite element approach including backup bearings which are modelled as simplified cageless ball bearings. Based on results of this study, the increase in backup bearing misalignment can have proportional impact on the rotor bending and shear stresses in touchdown situation.

Copyright © 2015 by ASME
Topics: Stress , Bearings , Rotors

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