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Performance comparisons in a bearingless motor with and without passive magnetic bearings are presented. The bearingless motor is actively controlled in two perpendicular x-y axes. The axial and conical movements are supported by passive magnetic bearings. The experimental results are compared to the calculated ones by three-dimensional finite element method. Effectiveness of passive magnetic bearings is analytically and experimentally investigated in both static and dynamic tests. It is found that a rotational test is successful only with the passive magnetic bearings.

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