Magnetic bearing device
First Claim
1. A magnetic bearing device comprising a rotary bearing fixed to a rotary shaft and a fixed bearing that supports said rotary bearing in non-contacting fashion, wherein said rotary bearing comprises a permanent magnet of convex cross-section formed with a convex portion towards the thrust direction of said rotary shaft, said fixed bearing comprises a permanent magnet of concave cross-section formed with a concave portion capable of fitting said convex portion and formed in said concave portion with a through-hole for insertion of said rotary shaft therethrough, said rotary shaft is supported in non-contacting fashion by the magnetic repulsive force that acts between said rotary bearing and fixed bearing when the convex portion of said rotary bearing is made to face the concave portion of said fixed bearing so as to fit therein with a minute gap, and the curve of the cross-section when the rotary bearing is sectioned in a plane parallel with the thrust direction of said rotary shaft is a parabola.
1 Assignment
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Accused Products
Abstract
A magnetic bearing device comprises a rotary bearing (20) fixed to a rotary shaft (10) and a fixed bearing (30) that supports the rotary bearing (20) in non-contacting fashion. The rotary bearing (20) comprises a permanent magnet of convex cross-section formed with a convex portion towards the thrust direction of the rotary shaft (10). The fixed bearing (30) comprises a permanent magnet of concave cross-section formed with a concave portion capable of fitting the convex portion and formed in the concave portion with a through-hole (35) for insertion of the rotary shaft (10) therethrough. The rotary shaft (10) is supported in non-contacting fashion by the magnetic repulsive force that acts between the rotary bearing (20) and the fixed bearing (30) when the convex portion of the rotary bearing (20) is made to face the concave portion of the fixed bearing (30) so as to fit therein with a minute gap.
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Citations
10 Claims
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1. A magnetic bearing device comprising a rotary bearing fixed to a rotary shaft and a fixed bearing that supports said rotary bearing in non-contacting fashion, wherein
said rotary bearing comprises a permanent magnet of convex cross-section formed with a convex portion towards the thrust direction of said rotary shaft, said fixed bearing comprises a permanent magnet of concave cross-section formed with a concave portion capable of fitting said convex portion and formed in said concave portion with a through-hole for insertion of said rotary shaft therethrough, said rotary shaft is supported in non-contacting fashion by the magnetic repulsive force that acts between said rotary bearing and fixed bearing when the convex portion of said rotary bearing is made to face the concave portion of said fixed bearing so as to fit therein with a minute gap, and the curve of the cross-section when the rotary bearing is sectioned in a plane parallel with the thrust direction of said rotary shaft is a parabola.
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4. A magnetic bearing device comprising a rotary bearing fixed to a rotary shaft and a fixed bearing that supports said rotary bearing in non-contacting fashion, wherein
said rotary bearing comprises a permanent magnet of concave cross-section formed with a concave portion towards the thrust direction of said rotary shaft, said fixed bearing comprises a permanent magnet of convex cross-section formed with a convex portion capable of fitting said concave portion and formed in said convex portion with a through-hole for insertion of said rotary shaft therethrough, said rotary shaft is supported in non-contacting fashion by the magnetic repulsive force that acts between said rotary bearing and fixed bearing when the concave portion of said rotary bearing is made to face the convex portion of said fixed bearing so as to fit therein with a minute gap, and the curve of the cross-section when the rotary bearing is sectioned in a plane parallel with the thrust direction of said rotary shaft is a parabola.
Specification