Magnetic bearing element for a rotor shaft using high-T.sub.C superconducting materials
First Claim
1. A magnetic bearing element for a rotor shaft having radially restoring magnetic forces in the event of a deflection of the rotor shaft from a reference position, said element comprising:
- a) a rotor body containing a first bearing part attached to the rotor shaft;
b) a second, fixed-position bearing part surrounding said rotor body;
c) one of the two bearing parts containing an arrangement of a plurality of alternately and axially polarized permanent magnetic elements which are mutually set apart by intervening spaces, said spaces each being completely filled in by an intermediate element made of a ferromagnetic material;
d) the other of the two bearing parts having a structure including high-Tc superconducting material;
e) the rotor shaft, in at least one tubular edge area facing the first bearing part, having a non-magnetic material;
f) the ferromagnetic intermediate elements serving to concentrate the magnetic flux exiting from the permanent magnetic elements on the side facing the superconducting structure;
g) the superconducting structure having grains made of the high-Tc superconducting material, of which the majority each have an average grain size which is larger than at least the axial thickness of each of the permanent magnetic elements.
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Accused Products
Abstract
A magnetic bearing element contains a first bearing part attached to a shaft and a second, fixed-position, bearing part surrounding the first bearing part. One of the bearing parts contains an arrangement of a plurality of alternately polarized permanent magnetic elements between which there are ferromagnetic elements and the other bearing part contains a superconducting structure. This superconducting structure should have grains made of high-Tc superconducting material, whose respective grain size is larger than the thickness of each of the permanent magnetic elements. In addition, the rotor shaft should be made of a non-magnetic material. The rotor shaft may contain the bearing part with permanent magnetic elements or the structure with the high-Tc superconducting material.
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Citations
22 Claims
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1. A magnetic bearing element for a rotor shaft having radially restoring magnetic forces in the event of a deflection of the rotor shaft from a reference position, said element comprising:
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a) a rotor body containing a first bearing part attached to the rotor shaft; b) a second, fixed-position bearing part surrounding said rotor body; c) one of the two bearing parts containing an arrangement of a plurality of alternately and axially polarized permanent magnetic elements which are mutually set apart by intervening spaces, said spaces each being completely filled in by an intermediate element made of a ferromagnetic material; d) the other of the two bearing parts having a structure including high-Tc superconducting material; e) the rotor shaft, in at least one tubular edge area facing the first bearing part, having a non-magnetic material; f) the ferromagnetic intermediate elements serving to concentrate the magnetic flux exiting from the permanent magnetic elements on the side facing the superconducting structure; g) the superconducting structure having grains made of the high-Tc superconducting material, of which the majority each have an average grain size which is larger than at least the axial thickness of each of the permanent magnetic elements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification