Improvement of sensing characteristics of self-sensing active magnetic bearings

✍ Scribed by Kozo Morita; Toshiya Yoshida; Katsumi Ohniwa

• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 646 KB
• Volume: 166
• Category: Article
• ISSN: 0424-7760
• DOI: 10.1002/eej.20732

✦ Synopsis

Abstract

A winding‐current interference model of self‐sensing magnetic bearings (AMBs) and an improvement technique of position‐sensing characteristics are proposed. In the self‐sensing AMB systems, the electromagnets work not only as actuators suspending the rotor but also as position sensors. The self‐sensing position signal, however, includes errors because of nonlinearity of the magnetic circuits. In the proposed model, the current is directly transmitted to the self‐sensing position signal. This transmission means degradation of the self‐sensing characteristics. This winding‐current interference to the self‐sensing signal is reduced by the proposed compensation method. The characteristics of the proposed self‐sensing method agree well with a reference sensor signal up to over 1 kHz. © 2008 Wiley Periodicals, Inc. Electr Eng Jpn, 166(2): 70– 77, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.20732 Copyright © 2004 Wiley Periodicals, Inc.