Abstract
A nested conical passive magnetic bearing is presented. The bearing consists of a nested conical rotor inside a conical stator, i.e. two coaxial tilted rings of permanent magnets, both with a rectangular cross section. Varying the cone or tilt angle of the rotor and stator we determine the rotor radius that provides the highest force for three different magnetization cases. For this optimal rotor radius, we show that the bearing with the highest volume normalized force also has the highest stiffness, and furthermore often also the highest varying stiffness with axial displacement. Finally, we show that a conical bearings with a tilt angle of 60^circ has an almost constant stiffness and a linearly varying force with axial displacement, making it ideal as a bearing.
Highlights
A nested conical passive magnetic bearing is presented
A variation study was conducted to determine the optimal geometry of a bearing as function of the tilt angle and the bearing type
We presented a concentric magnetic bearing consisting of two coaxial nested concentric rings of opposing permanent magnets as the rotor and stator
Summary
A nested conical passive magnetic bearing is presented. The bearing consists of a nested conical rotor inside a conical stator, i.e. two coaxial tilted rings of permanent magnets, both with a rectangular cross section. The idea is that if the bearing is shaped like two nested conical rings, with the rotor inside the stator, the magnetic forces will both have a component providing a lifting force along the axis of the bearing, and a component along the radial direction, which might allow the stiffness along this direction to be designed as desired.
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