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International Journal of Rotating Machinery
Volume 9 (2003), Issue 2, Pages 127-133

Mechatronical Design Studies on Small Brushless Motors

1LCM—Linz Center of Competence in Mechatronics at Johannes Kepler University, Linz, Austria
2Levitronix GmbH, Zurich, Switzerland
3LCM—Linz Center of Competence in Mechatronics at Johannes Kepler University of Linz, Altenbergerstrasse 69, Linz A-4040, Austria

Copyright © 2003 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Brushless DC- and AC-permanent-magnet motors controlled by powerful micro-controller electronics have opened up a significant share of the small motor market in the last years. Based on the mechanical low cost construction of single-phase motor the paper presents electronic drive concepts to improve the performance and for special applications also the lifetime of brushless motors. The tangential and radial forces acting on the rotor are controlled by special phase current curves to reduce the torque ripple and to avoid expendable machinery parts like ball or sliding bearings.