WO2002095899B1 - Magnetic thrust bearing with permanent bias flux - Google Patents

Magnetic thrust bearing with permanent bias flux

Info

Publication number
WO2002095899B1
WO2002095899B1 PCT/US2002/015778 US0215778W WO02095899B1 WO 2002095899 B1 WO2002095899 B1 WO 2002095899B1 US 0215778 W US0215778 W US 0215778W WO 02095899 B1 WO02095899 B1 WO 02095899B1
Authority
WO
WIPO (PCT)
Prior art keywords
thrust member
ferrous
electromagnetic bearing
control
flux path
Prior art date
Application number
PCT/US2002/015778
Other languages
French (fr)
Other versions
WO2002095899A1 (en
Inventor
Patrick T Mcmullen
Co Si Huynh
Original Assignee
Calnetix
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Calnetix filed Critical Calnetix
Publication of WO2002095899A1 publication Critical patent/WO2002095899A1/en
Publication of WO2002095899B1 publication Critical patent/WO2002095899B1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
    • F16C32/0406—Magnetic bearings
    • F16C32/044—Active magnetic bearings
    • F16C32/0459—Details of the magnetic circuit
    • F16C32/0461—Details of the magnetic circuit of stationary parts of the magnetic circuit
    • F16C32/0465—Details of the magnetic circuit of stationary parts of the magnetic circuit with permanent magnets provided in the magnetic circuit of the electromagnets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
    • F16C32/0406—Magnetic bearings
    • F16C32/044—Active magnetic bearings
    • F16C32/0474—Active magnetic bearings for rotary movement
    • F16C32/0476—Active magnetic bearings for rotary movement with active support of one degree of freedom, e.g. axial magnetic bearings

Abstract

A magnetic thrust bearing having a high speed rotation capability and low cost construction. The magnetic thrust bearing has permanent magnets to provide bias flux. The magnetic circuits of the control flux and bias fluxes are substantially non-coincident, which allows for a low reluctance and efficient path for the control flux. The flux paths of the permanent magnets are completely defined with minimized airgaps for achieving higher forces and efficiency and very low control currents produce extremely large forces. No radially magnetized permanent magnets are required and no permanent magnets are attached to the rotor.

Claims

AMENDED CLAMS[Received by the international Bureau on 12 November 2002 (12.11.02): original claim 1 replaced by amended claim 1]CLAIMS
1. An electromagnetic bearing for a thrust member having a distal region extending outwardly from a support comprising:
at least one continuously magnetic ferrous member having a coil, the ferrous member straddling the distal region of said thrust member, confronting surfaces of at least two extrusions of the ferrous member and thrust member defining control flux air gaps on opposite sides of the thrust member, and generating an electromagnetic control flux path through the air gaps whereby to axially position the ferrous member relative to the thrust member;
confronting surfaces of at least one permanent magnet and either the thrust member or the ferrous member, defining at least one magnetic air gap spaced from at least one of the control flex air gaps, and generating a bias flux path parallel and non-coincident with the control flux path for a substantial portion of its length, wherein the permanent magnet is outside the control flux path and the length of each air gap in said bearing is limited to the physical separation of the confronting surfaces.
2. The electromagnetic bearing as in Claim 1, wherein the support is a rotating shaft.
3. The electromagnetic bearing as in Claim 1 , wherein the thrust member is rotatable.
4. The electromagnetic bearing as in Claim 1, wherein the thrust member is a stationary linear rail.
5. The electromagnetic bearing as in Claim 13 wherein the permanent magnet is a superconducting magnet.
PCT/US2002/015778 2001-05-23 2002-05-16 Magnetic thrust bearing with permanent bias flux WO2002095899A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/865,015 2001-05-23
US09/865,015 US6700258B2 (en) 2001-05-23 2001-05-23 Magnetic thrust bearing with permanent bias flux

Publications (2)

Publication Number Publication Date
WO2002095899A1 WO2002095899A1 (en) 2002-11-28
WO2002095899B1 true WO2002095899B1 (en) 2003-11-27

Family

ID=25344535

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2002/015778 WO2002095899A1 (en) 2001-05-23 2002-05-16 Magnetic thrust bearing with permanent bias flux

Country Status (2)

Country Link
US (1) US6700258B2 (en)
WO (1) WO2002095899A1 (en)

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CN106438691A (en) * 2016-10-13 2017-02-22 中国人民解放军海军工程大学 Permanent magnet bias hybrid axial magnetic bearing
CN107060909B (en) * 2016-12-17 2019-10-11 山东天瑞重工有限公司 A kind of turbomachinery with novel thrust bearing
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Also Published As

Publication number Publication date
WO2002095899A1 (en) 2002-11-28
US6700258B2 (en) 2004-03-02
US20020175578A1 (en) 2002-11-28

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