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International Journal of Rotating Machinery
Volume 10 (2004), Issue 3, Pages 221-226

Limits for the Use of Auto-Balancing

Department of Mechanical Engineering, Linköping University, Linköping SE-581 83, Sweden

Copyright © 2004 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.


The principle for autobalancing by the use of balls running freely in a ring concentric with the rotor center has been known for a long time. However, only in recent times has it been used in real machinery, such as grinding machines and laundry machines. By the increased need for higher precision, it is likely to come into use more frequently in the future. This means that it is important to know its application possibilities better. By using a time averaging technique, it has been possible to find analytical solutions to a number of problems. This article deals with; (1) the case of a rotor with anisotropic bearings and damping, where precise conditions for possible balancing are presented; (2) influence from inaccuracy of balancing ring and a rotor with longitudinal extension and thus having not only a point mass but also a moment of inertia; and (3) using two balancing planes to allow both static and dynamic balancing.