Magnetic suspension bearing

• US 20040113502A1
• Filed: 10/02/2003
• Published: 06/17/2004
• Est. Priority Date: 10/25/2000
• Status: Active Grant

• Current Assignee: Guo-Kun Li, Xiaobo Li, Xiaopeng Li
• Original Assignee: Guo-Kun Li, Xiaobo Li, Xiaopeng Li
• Inventors: Li, Xiaobo, Li, Xiaopeng, Li, Guo-Kun
• Granted Patent: US 7,262,531 B2
• Time in Patent Office: Days
• US Class Current: 310/90.5
• CPC Class Codes: F16C 32/0408 Passive magnetic bearings
• CPC Class Codes: F16C 32/0412 for radial load mainly
• CPC Class Codes: F16C 32/0417 for axial load mainly

Abstract

The present invention relates to a magnetic suspension bearing supported by magnetic force, which comprises one or more magnets fixed on a shaft directly or indirectly which can rotate with said shaft, and matching magnets provided in a certain space, wherein the magnetic polarity and magnitude of magnetic force of the matching magnets match with the magnetic polarity and magnitude of magnetic force of said one or more magnets to achieve the full suspension rotation of said shaft, and said magnets and/or matching magnets are permanent magnets. The present invention is of simple design and large power.

Claims

1. A magnetic suspension bearing, characterized in that the bearing comprises one or more magnets fixed on a shaft directly or indirectly which can rotate with said shaft, and matching magnets provided in certain space, wherein the magnetic polarity and magnitude of magnetic force of the matching magnets match with the magnetic polarity and magnitude of magnetic force of said one or more magnets to achieve the full suspension rotation of said shaft, and that said magnets and/or matching magnets are permanent magnets.

2. The magnetic suspension bearing as claimed in claim 1, characterized in that said magnets and said matching magnets form at least two sets of radial stable magnetic rings and at least one set of axial stable magnetic rings provided between said radial stable magnetic rings, wherein said radial stable magnetic ring comprises a radial static magnetic ring formed by said matching magnets fixed to a bearing housing and a radial movable magnetic ring formed by said magnets which is parallel to the radial static magnetic ring and fixed to a shaft sleeve which extends in radial direction, said radial static magnetic ring and said radial movable magnetic ring both comprise more than two cross magnetic poles which are closely connected in the radial direction, the magnetic poles corresponding to said radial static magnetic ring and said radial movable magnetic ring along the radial direction have the same magnitude of magnetic force with opposite polarities;

said axial stable magnetic ring comprises an axial static magnetic ring formed by said matching magnets fixed to a bearing housing and an axial movable magnetic ring formed by said magnets which is parallel to the axial static magnetic ring and fixed to a shaft sleeve which extends in the axial direction, both said axial static magnetic ring and said axial movable magnetic ring comprise more than two cross magnetic poles which are closely connected in the axial direction, the magnetic poles corresponding to said axial static magnetic ring and said axial movable magnetic ring along the axial direction have the same magnitude of magnetic force with opposite polarities.

3. The magnetic suspension bearing as claimed in claim 2, characterized in that said closely connected cross magnetic poles are formed by jointing two or more ring-shaped permanent magnets together, each one of the ring-shaped permanent magnets is a single ring-shaped permanent magnet.

4. The magnetic suspension bearing as claimed in claim 2, characterized in that said closely connected cross magnetic poles are formed by jointing two or more ring-shaped permanent magnets together, that each one of the ring-shaped permanent magnets is formed by sticking two or more permanent magnetic blocks together.

5. The magnetic suspension bearing as claimed in claim 2, characterized in that said closely connected cross magnetic poles are formed by way of a multiple-pole magnetizing method.

7. The magnetic suspension bearing as claimed in claim 6, characterized in that said magnets and/or matching magnets are permanent magnets.

8. The magnetic suspension bearing as claimed in claim 1, characterized in that said magnets are two cylindrical magnets having the same polarity and magnitude of magnetic force provided respectively in central bottoms of two circular-basin-shaped magnetizers face to face, said matching magnets are two arc magnets which are respectively fixed on the edges of the basins of the two magnetizers and form into two hollow cylindrical multiple-pole magnets, and that the corresponding magnetic poles of the two hollow cylindrical multiple-pole magnets have the same magnitude of magnetic force with opposite directions.

6. The magnetic suspension bearing as claimed in claim 2, characterized in that said closely connected cross magnetic poles have four magnetic poles.

6-1. A magnet suspension bearing, characterized in that the bearing comprises one or more magnets fixed on a shaft directly or indirectly which can rotate with said shaft, and matching magnets provided in a certain space, wherein the magnetic polarity and magnitude of magnetic force of the matching magnets match with the magnetic polarity and magnitude of magnetic force of said one or more magnets to realize the complete magnetic suspension rotation of said shaft.

7-2. The magnetic suspension bearing as claimed in claim 1, characterized in that said magnets is an adaxial ring-shaped permanent magnet fixed on the shaft directly or indirectly, there are three matching magnets, an abaxial ring-shaped permanent magnet fixed on a ring-shaped magnetizer, which has the same polarity and magnitude of magnetic force as said adaxial ring-shaped permanent magnet, a left side ring-shaped permanent magnet and a right side ring-shaped permanent magnet provided on the each side of said abaxial ring-shaped permanent magnet respectively, which are fixed on said magnetizer and have the same polarity as said abaxial ring-shaped permanent magnet.