CA1099323A - Removable magnetic suspension system - Google Patents
Removable magnetic suspension systemInfo
- Publication number
- CA1099323A CA1099323A CA294,659A CA294659A CA1099323A CA 1099323 A CA1099323 A CA 1099323A CA 294659 A CA294659 A CA 294659A CA 1099323 A CA1099323 A CA 1099323A
- Authority
- CA
- Canada
- Prior art keywords
- detector
- rotor
- bearing
- electromagnetic
- radial
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
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
- F16C32/047—Details of housings; Mounting of active magnetic bearings
-
- 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
-
- 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
- F16C32/048—Active magnetic bearings for rotary movement with active support of two degrees of freedom, e.g. radial magnetic bearings
-
- 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
- F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
Abstract
ABSTRACT
A removable magnetic suspension system for a rotor comprising at least one electromagnetic bearing constituted by an armature supported by a casing fast with the rotor and a stator mounted on a fixed support, and at least one electro-magnetic rotor-position detector constituted by a fixed stator cooperating with a part forming an armature integral with the rotor for controlling the bearing characterised in that the detector is mounted independently of the bearing which it controls and comprises a stator fixedly mounted on a fixed support and disposed directly in register with a reference surface formed on the rotor and independent of the casing supporting the bearing armature.
A removable magnetic suspension system for a rotor comprising at least one electromagnetic bearing constituted by an armature supported by a casing fast with the rotor and a stator mounted on a fixed support, and at least one electro-magnetic rotor-position detector constituted by a fixed stator cooperating with a part forming an armature integral with the rotor for controlling the bearing characterised in that the detector is mounted independently of the bearing which it controls and comprises a stator fixedly mounted on a fixed support and disposed directly in register with a reference surface formed on the rotor and independent of the casing supporting the bearing armature.
Description
This invention relates to a dismountable magnetic suspension system for a rotor of the type comprising at least one electro-magnetic bearing constituted by an armature supported by a sleeve removeably affixed to the rotor and a stator mounted opposite to the armature on a fixed support, and at least one electromagnetic, rotor-position detector constituted by a fixed stator cooperating with a part forming an armature integral with the rotor to control the bearing.
It is known removably to mount by such bearings a rotor inside a frame. Thus, in finishing lathes, for example, a shaft is temporarily mounted on magnetic bearings to allow high precision working. Such working mus-t be done, for example, on printing rollers which will eventualli be mounted in roller bearings for printing purposes but which having been engraved must be finished to give a perfectly regular curve~ This finishing operation is effected by a lathe in which the printing roller is mounted by a dismountable magnetic suspension.
In known magnetic suspension systems, each electro-magnetic bearing comprises a stator fixed to a frame and an armature fast with a sleeve engaged on the end of the rotor. The electromagnetic detector serving to control the bearing is itself mounted alongside the bearing which it controls and comprises a fixed stator arranged relative to an armature fast with the sleeve. Such an arrangement has drawbacks. Indeed, the removable sleeve of the bearing is always engaged on the rotating shaft slightly inprecisely. Errors in centering or fixing the bearing are of relatively limited importance insoEar as there is no contact between stator and rotor but this does not hold good for the detector which must not transmit erroneous indications of the rotor position. Consequently, a mounting 3~3 such as described above in which the detectors associated with the bearings acting in cooperation with the removable sleeve is not satisfactory.
The present invention obviates or mitigates the aforesaid drawbacks by providing a removable magnetic suspenSion in which the detection of the rotor position is improved.
This is achieved by a suspension system for a rotor of the type mounted above in which, according to the invention, the detector is mounted lndependently of the bearing it controls and comprises a stator removably mounted on a frame and arranged directly opposite to a reference surface formed on the rotor and independently of the sleeve carrving the armature of the bearing.
The bearing and associated detector can be radial or axial.
The invention applies equally to a mounting comprising one or more radial bearings and one or more axial bearings associated respectively with one or more radial or axial detectors. In this case, each detector is mounted independently of the bearing it controls and each detector comprises a stator removably mounted on a fixed support and disposed directly opposite an annular reference surface on the rotor.
Thus, according to the invention, the detectorscooperate directly with the rotor and more precisely with a reference sur~ace on the rotor so that a substantial precision in the detection of the position of the rotor is ensured.
In one embodiment, the reference surface associated with a radial detector is constituted by a finished surface portion already formed on the rotor and to be received in a roller 3Q bearing.
Thus, the reference surface selected for a detector need --3~
not necessarily be formed exclusively with a view ~o mounting an electromagnetic bearing associated with the detector but can equally serve to be mounted in a roller bearing.
An annular reference surface associated with an axial bearing and formed in a radial plane of the rotor ls constituted by a shoulder formed on the rotor. Sometimes, this annular plane s~lrface is constituted by the end of the rotor.
It is advantageous, since it is not indispensable, that a radial detector be disposed below the sleeve carrying the armature o~ the radial bearing controlled b~ the detector in the same radial position as the radial bearing.
An embodiment of the present invention will now be Aescribed, by way of example, with reference to the drawing which is a half-sectional longitudinal view of a rotor mounted on electromagnetic bearings according to the invention.
A sleeve 2 supporting one part of an electromagnetic bearing is mounted on the end portion of the shaft 1. The shaft 1 is s~lown in known manner in different successive portions la, lb, lc, ld whereof the respec~ive diameters can be slightly increased starting from end portion la which is smallest.
The sleeve 2 is fitted on an end of the sha~t 1 and is ma`intained in position by a gripper 35 supported on a fixed men~er 25 integral with a fixed frame 7. The sleeve 2 supports on its external face the armature 4 of a radial bearing 3 which the stator 5, 6 integral with the fixed frame 7 surrounds and is spaced from the armature 4 by a small distance epr. The stator 5, 6 comprises a core 5 and a winding 6 with two supply conductors 8, 9.
A disc 11 is fixed on the sleeve 2 and has a peripheral part 12 constituting the armature of an axial hearing 10. The armature 12 cooperates with two s-tators on opposite sides of -the armature 12 and spaced a small distance epa. Each stator 13, 15 has a winding 14, 16. The stators 13, 14 and 15, 16 are fixed on the fixed frame 7.
The axial bearing 10 may naturally comprise only one stator, say 13, 14, surrounding the axis of shaft 1.
Axial electromagnetic detectors are disposed, in known manner, immediately adjacent the axial bearing 10. Thus, the annular seatings 18 and 20 formed respectively in fixed members 21 and 22, supporting the stators of bearing 10 can accommodate detector stators cooperating with annular armatures 17, 19 of ferromagnetic sheet material respectively which are incorporated .in the disc 11.
Similarly, a detector for the radial position of the rotor 1 is located immediately adjacent the radial bearing 3 and comprises a fixed stator associated with an armature integral with sleeve 2. Such embodiments would sometimes be relatively inaccurate, since the sleeve 2 is engaged on the shaft 1 with certain centering errors and consequent:Ly the surfaces connected to the sleeve 2 and formi.ng the detector armature do not provide an exact reference for rotor position.
According to the invention, a radial electromagnetic detector 46 is mounted independently of the sleeve 2.to cooperate directly with a finished surface 47 of rotor 1. The detector 46 comprises a stator 48, 49 comprising a sheet iron core 48 and a windin~ 49 mounted on a support 50. The reference surface 47 is constituted by a cylindrical finished (or trued) surface portion of the rotor periphery and serves as an armature for the detector 46 and is spaced ~rom the stator by a distance ear. The surface 47 may be destined eventually to be housed in a roller bearing when the bearing 3 have been removed and shaft 1 installed ln its lequired instal~ation position.
''. ~ , ~93~3 The portion 50 supporting armature 4g, 49 i.s fixed by a connector 51 on a ring 58 mounted on the end of a member 45 fixed to frame 7 by intermediate elements 41. The as~embly 41, 45, 58, to the end of which is secured t'he detector 46 may be released from the frame 7 by unscrewing bolts 43, 44 when the sleeve 2 is released.
In ~ne advanta~eous embodiment, as illustrated, the detector 46 is disposed under the sleeve 2 below the radial bearing 3 so that the latter and detector 46 are in closely adjacent radial planes. The sleeve 2 has a reduced thickness in 20ne 22 so as to provide a free space between rotor 1 and sleeve 2 and permit location of detector 46 opposite surface 47 without contact between the fixed stator 48, 49 and sleeve 2.
An axial electromagnetic detector 52 for controlling axial electromagnetic bearing 10 is mounted independently of the sleeve 2 opposite a reference surface 53 of rotor 1. The plane annular surface 53 perpendicular to the rotor axis is constituted by a shoulder formed at the junction between two rotor portions lc and ld. The surface 53 constitutes the armature of the axial detector 52 which is spaced a distanc,e eda from the detector stator formed~by an annular core 54 pro~ided with a winding 55. The stator 54, 55 is incorporated in a support 56 removabl~ mounted by a connector 57 on a member unitary with the frame 7. The support 56 can itself be mounted on a part 42 of a member such that the member contributes to the support of the stator of radial detector 46.
Thus the detectors 46 and 52 have stators removably affixed on the fixed frame 7 independently of the bearings they control and disposed directly opposite reference surfaces 47/
53 respectively. The detectors 46 and 52 precisely determine the rotor positlon . ' ' ' ' ~ . ' 93~3 whatever the errorsin the positioning of the sleeve 2 removably secured to the end o~ the rotor~
The structure of the stators of the bearings and detectors do not form part of the invention. For example, the annular stators 13, 14, 15, 16; 54, 55 of axial bearing lO
and axial detector 52 comprise a ferromagnetic body 13, 15, 54 coaxial with the shaft 1 and an excitation winding 14, 16, 55.
The radial bearing 3 comprises a stator 5, 6 whereof the core 5 is formed a pole piece or an iron core on which is mounted an assembly of windings 6.
Constitution of the stator of radial detector 46 is advantageously that disclosed in French Patent No. 2214890.
The excitation current of winding 6 of radial bearing 3 is controlled by signals delivered by the detector 46. The control of bearing 3 by detector 46 can be effected by circuits as disclosed in French Patent No. 2149644. Naturally, it is possible to operate several detectors such as detector 46, different detectors being mounted in a manner so as to cooperate with re~erence surfaces on rotor 1, the stators being removably mounted on the frame 7.
The electric cables going to windings 49, 55, of detectors 46 and 52 respectively, not shown in the drawings, are introduced into tubular cavities provided in members 58, 56 and 45.
The figure shows a magnetic suspension removably mounted on one end o~ the rotor but it will be manifest that a rotor can be supported at each end by such a suspension.
Various modifications may be made without departing from the scope of the accompan~.;.ng claims~
For example, it often appears that harmful effects due to synchronous parasitic perturbations arising out an imbalance - ~ .
93~3 arising frol~ the fact that the rotor 1 is not ~nounted in beaxing 3 such that its axis of inertia coincides exP~ctly ~lith the axis of rotation of the bearlng.s. It is possible to reduce these harmful effects, to control the bearin~rs such as 3 by detectors such as 46 and control circui-ts such as are disclo~sed in ~rench Patent No. 2336602.
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It is known removably to mount by such bearings a rotor inside a frame. Thus, in finishing lathes, for example, a shaft is temporarily mounted on magnetic bearings to allow high precision working. Such working mus-t be done, for example, on printing rollers which will eventualli be mounted in roller bearings for printing purposes but which having been engraved must be finished to give a perfectly regular curve~ This finishing operation is effected by a lathe in which the printing roller is mounted by a dismountable magnetic suspension.
In known magnetic suspension systems, each electro-magnetic bearing comprises a stator fixed to a frame and an armature fast with a sleeve engaged on the end of the rotor. The electromagnetic detector serving to control the bearing is itself mounted alongside the bearing which it controls and comprises a fixed stator arranged relative to an armature fast with the sleeve. Such an arrangement has drawbacks. Indeed, the removable sleeve of the bearing is always engaged on the rotating shaft slightly inprecisely. Errors in centering or fixing the bearing are of relatively limited importance insoEar as there is no contact between stator and rotor but this does not hold good for the detector which must not transmit erroneous indications of the rotor position. Consequently, a mounting 3~3 such as described above in which the detectors associated with the bearings acting in cooperation with the removable sleeve is not satisfactory.
The present invention obviates or mitigates the aforesaid drawbacks by providing a removable magnetic suspenSion in which the detection of the rotor position is improved.
This is achieved by a suspension system for a rotor of the type mounted above in which, according to the invention, the detector is mounted lndependently of the bearing it controls and comprises a stator removably mounted on a frame and arranged directly opposite to a reference surface formed on the rotor and independently of the sleeve carrving the armature of the bearing.
The bearing and associated detector can be radial or axial.
The invention applies equally to a mounting comprising one or more radial bearings and one or more axial bearings associated respectively with one or more radial or axial detectors. In this case, each detector is mounted independently of the bearing it controls and each detector comprises a stator removably mounted on a fixed support and disposed directly opposite an annular reference surface on the rotor.
Thus, according to the invention, the detectorscooperate directly with the rotor and more precisely with a reference sur~ace on the rotor so that a substantial precision in the detection of the position of the rotor is ensured.
In one embodiment, the reference surface associated with a radial detector is constituted by a finished surface portion already formed on the rotor and to be received in a roller 3Q bearing.
Thus, the reference surface selected for a detector need --3~
not necessarily be formed exclusively with a view ~o mounting an electromagnetic bearing associated with the detector but can equally serve to be mounted in a roller bearing.
An annular reference surface associated with an axial bearing and formed in a radial plane of the rotor ls constituted by a shoulder formed on the rotor. Sometimes, this annular plane s~lrface is constituted by the end of the rotor.
It is advantageous, since it is not indispensable, that a radial detector be disposed below the sleeve carrying the armature o~ the radial bearing controlled b~ the detector in the same radial position as the radial bearing.
An embodiment of the present invention will now be Aescribed, by way of example, with reference to the drawing which is a half-sectional longitudinal view of a rotor mounted on electromagnetic bearings according to the invention.
A sleeve 2 supporting one part of an electromagnetic bearing is mounted on the end portion of the shaft 1. The shaft 1 is s~lown in known manner in different successive portions la, lb, lc, ld whereof the respec~ive diameters can be slightly increased starting from end portion la which is smallest.
The sleeve 2 is fitted on an end of the sha~t 1 and is ma`intained in position by a gripper 35 supported on a fixed men~er 25 integral with a fixed frame 7. The sleeve 2 supports on its external face the armature 4 of a radial bearing 3 which the stator 5, 6 integral with the fixed frame 7 surrounds and is spaced from the armature 4 by a small distance epr. The stator 5, 6 comprises a core 5 and a winding 6 with two supply conductors 8, 9.
A disc 11 is fixed on the sleeve 2 and has a peripheral part 12 constituting the armature of an axial hearing 10. The armature 12 cooperates with two s-tators on opposite sides of -the armature 12 and spaced a small distance epa. Each stator 13, 15 has a winding 14, 16. The stators 13, 14 and 15, 16 are fixed on the fixed frame 7.
The axial bearing 10 may naturally comprise only one stator, say 13, 14, surrounding the axis of shaft 1.
Axial electromagnetic detectors are disposed, in known manner, immediately adjacent the axial bearing 10. Thus, the annular seatings 18 and 20 formed respectively in fixed members 21 and 22, supporting the stators of bearing 10 can accommodate detector stators cooperating with annular armatures 17, 19 of ferromagnetic sheet material respectively which are incorporated .in the disc 11.
Similarly, a detector for the radial position of the rotor 1 is located immediately adjacent the radial bearing 3 and comprises a fixed stator associated with an armature integral with sleeve 2. Such embodiments would sometimes be relatively inaccurate, since the sleeve 2 is engaged on the shaft 1 with certain centering errors and consequent:Ly the surfaces connected to the sleeve 2 and formi.ng the detector armature do not provide an exact reference for rotor position.
According to the invention, a radial electromagnetic detector 46 is mounted independently of the sleeve 2.to cooperate directly with a finished surface 47 of rotor 1. The detector 46 comprises a stator 48, 49 comprising a sheet iron core 48 and a windin~ 49 mounted on a support 50. The reference surface 47 is constituted by a cylindrical finished (or trued) surface portion of the rotor periphery and serves as an armature for the detector 46 and is spaced ~rom the stator by a distance ear. The surface 47 may be destined eventually to be housed in a roller bearing when the bearing 3 have been removed and shaft 1 installed ln its lequired instal~ation position.
''. ~ , ~93~3 The portion 50 supporting armature 4g, 49 i.s fixed by a connector 51 on a ring 58 mounted on the end of a member 45 fixed to frame 7 by intermediate elements 41. The as~embly 41, 45, 58, to the end of which is secured t'he detector 46 may be released from the frame 7 by unscrewing bolts 43, 44 when the sleeve 2 is released.
In ~ne advanta~eous embodiment, as illustrated, the detector 46 is disposed under the sleeve 2 below the radial bearing 3 so that the latter and detector 46 are in closely adjacent radial planes. The sleeve 2 has a reduced thickness in 20ne 22 so as to provide a free space between rotor 1 and sleeve 2 and permit location of detector 46 opposite surface 47 without contact between the fixed stator 48, 49 and sleeve 2.
An axial electromagnetic detector 52 for controlling axial electromagnetic bearing 10 is mounted independently of the sleeve 2 opposite a reference surface 53 of rotor 1. The plane annular surface 53 perpendicular to the rotor axis is constituted by a shoulder formed at the junction between two rotor portions lc and ld. The surface 53 constitutes the armature of the axial detector 52 which is spaced a distanc,e eda from the detector stator formed~by an annular core 54 pro~ided with a winding 55. The stator 54, 55 is incorporated in a support 56 removabl~ mounted by a connector 57 on a member unitary with the frame 7. The support 56 can itself be mounted on a part 42 of a member such that the member contributes to the support of the stator of radial detector 46.
Thus the detectors 46 and 52 have stators removably affixed on the fixed frame 7 independently of the bearings they control and disposed directly opposite reference surfaces 47/
53 respectively. The detectors 46 and 52 precisely determine the rotor positlon . ' ' ' ' ~ . ' 93~3 whatever the errorsin the positioning of the sleeve 2 removably secured to the end o~ the rotor~
The structure of the stators of the bearings and detectors do not form part of the invention. For example, the annular stators 13, 14, 15, 16; 54, 55 of axial bearing lO
and axial detector 52 comprise a ferromagnetic body 13, 15, 54 coaxial with the shaft 1 and an excitation winding 14, 16, 55.
The radial bearing 3 comprises a stator 5, 6 whereof the core 5 is formed a pole piece or an iron core on which is mounted an assembly of windings 6.
Constitution of the stator of radial detector 46 is advantageously that disclosed in French Patent No. 2214890.
The excitation current of winding 6 of radial bearing 3 is controlled by signals delivered by the detector 46. The control of bearing 3 by detector 46 can be effected by circuits as disclosed in French Patent No. 2149644. Naturally, it is possible to operate several detectors such as detector 46, different detectors being mounted in a manner so as to cooperate with re~erence surfaces on rotor 1, the stators being removably mounted on the frame 7.
The electric cables going to windings 49, 55, of detectors 46 and 52 respectively, not shown in the drawings, are introduced into tubular cavities provided in members 58, 56 and 45.
The figure shows a magnetic suspension removably mounted on one end o~ the rotor but it will be manifest that a rotor can be supported at each end by such a suspension.
Various modifications may be made without departing from the scope of the accompan~.;.ng claims~
For example, it often appears that harmful effects due to synchronous parasitic perturbations arising out an imbalance - ~ .
93~3 arising frol~ the fact that the rotor 1 is not ~nounted in beaxing 3 such that its axis of inertia coincides exP~ctly ~lith the axis of rotation of the bearlng.s. It is possible to reduce these harmful effects, to control the bearin~rs such as 3 by detectors such as 46 and control circui-ts such as are disclo~sed in ~rench Patent No. 2336602.
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. . . : ,, ~ , .
, .. . . . . .
'' ',: ' ' :' -, . .
- . . ~
.
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Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A removable suspension system for a rotor that revolves with respect to a stationary assembly, comprising :
(a) a sleeve removably affixed to said rotor ;
(b) at least one electromagnetic bearing inclu-ding a bearing armature supported by said sleeve and a stator mounted on a fixed support in operative position with respect to said bearing armature ;
(c) at least one electromagnetic rotor-position detector mounted on said fixed support independently from said at least one electromagnetic bearing, for control-ling said electromagnetic bearing, said electromagnetic rotor-position detector including :
(i) a reference surface formed on said rotor, said reference surface constituting a detector armature for said at least one electromagnetic rotor-position detector ; and (ii) a stator removably mounted on said fixed support disposed directly opposite said reference surface on said rotor and independent from said sleeve.
(a) a sleeve removably affixed to said rotor ;
(b) at least one electromagnetic bearing inclu-ding a bearing armature supported by said sleeve and a stator mounted on a fixed support in operative position with respect to said bearing armature ;
(c) at least one electromagnetic rotor-position detector mounted on said fixed support independently from said at least one electromagnetic bearing, for control-ling said electromagnetic bearing, said electromagnetic rotor-position detector including :
(i) a reference surface formed on said rotor, said reference surface constituting a detector armature for said at least one electromagnetic rotor-position detector ; and (ii) a stator removably mounted on said fixed support disposed directly opposite said reference surface on said rotor and independent from said sleeve.
2. A suspension system according to claim 1 in which the bearing and associated detector are axial.
3. A suspension system according to claim 1, in which the-bearing and associated detector are radial.
4. A suspension system according to claim 1 comprising at least one radial electromagnetic end bearing associated with at lease one radial electroma-gnetic detector, said at least one radial electromagne-tic detector including a first stator and first armature, and an axial electromagnetic bearing associated with an axial electromagnetic detector, said axial electromagne-tic detector including a second stator and second arma-ture, each said at least one radial electromagnetic de-tector and said axial electromagnetic detector being mounted independently of the bearing it controls and said first and second stators of said at least one radial electromagnetic detector and said axial electromagnetic detector, respectively, being removably mounted on fi-xed support in operative position opposite associated annular reference surfaces formed on said rotor, wherein each said annular reference surface constitutes an arma-ture for its respective detector.
5. A suspension system according to claim 2, in which the annular reference surface associated with said axial electromagnetic detector is flat and perpendicular to the longitudinal axis of the rotor and is constituted by a shoulder formed on the rotor.
6. A suspension system according to claim 3, in which the reference surface associated with the radial detector is constituted by a finished cylindrical surfa-ce portion of the rotor periphery suitable for accomo-dation in a roller bearing.
7. A suspension system according to claim 6, in which the radial detector is disposed within the sleeve below the radial bearing, substantially in the same radial plane as the radial plane of symmetry of the radial bearing.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7700921 | 1977-01-13 | ||
| FR7700921A FR2377551A1 (en) | 1977-01-13 | 1977-01-13 | REMOVABLE MAGNETIC SUSPENSION SYSTEM |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1099323A true CA1099323A (en) | 1981-04-14 |
Family
ID=9185456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA294,659A Expired CA1099323A (en) | 1977-01-13 | 1978-01-10 | Removable magnetic suspension system |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4302061A (en) |
| JP (1) | JPS5945847B2 (en) |
| CA (1) | CA1099323A (en) |
| DE (1) | DE2800999C2 (en) |
| FR (1) | FR2377551A1 (en) |
| GB (1) | GB1598800A (en) |
| IT (1) | IT1106523B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3150122A1 (en) * | 1981-12-18 | 1983-06-30 | Teldix Gmbh, 6900 Heidelberg | Magnetic bearing device |
| JPS607424U (en) * | 1983-06-28 | 1985-01-19 | 日本精工株式会社 | thrust magnetic bearing |
| US8522829B2 (en) * | 2006-11-29 | 2013-09-03 | 3M Innovative Properties Company | Microphere-containing insulation |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1257423A (en) * | 1970-04-11 | 1971-12-15 | ||
| DE2139614A1 (en) * | 1971-08-07 | 1973-05-30 | Dornier Ag | MAGNETIC MOUNTING, IN PARTICULAR FREE-FLOATING SUSPENSION FOR AN AXIALLY EXTENDED ROTOR WITH VERTICAL ROTARY AXIS |
| FR2149644A5 (en) * | 1971-08-18 | 1973-03-30 | France Etat | |
| DE2153180A1 (en) * | 1971-10-26 | 1973-05-30 | Dornier Ag | MAGNETIC MOUNTING, IN PARTICULAR FREE-FLOATING SUSPENSION FOR AN AXIALLY EXTENDED ROTOR WITH VERTICAL ROTARY AXIS |
| DE2213447C3 (en) * | 1972-03-20 | 1981-01-29 | Karl 5170 Juelich Boden | Magnetic storage |
| DE2213470B2 (en) * | 1972-03-20 | 1980-04-10 | Padana Ag, Zug (Schweiz) | Magnetic bearing |
| DE2213465C3 (en) * | 1972-03-20 | 1986-02-13 | Padana AG, Zug | Electromagnetic bearing element |
| US3787100A (en) * | 1972-12-11 | 1974-01-22 | Armement Direction Tech Engins | Devices including rotating members supported by magnetic bearings |
| US3955858A (en) * | 1974-01-03 | 1976-05-11 | Societe Nationale Industrielle Aerospatiale | Satellite momentum wheel |
| CH583856A5 (en) * | 1974-09-27 | 1977-01-14 | Balzers Patent Beteilig Ag | |
| FR2336602A1 (en) * | 1975-12-24 | 1977-07-22 | Europ Propulsion | COMPENSATION DEVICE FOR SYNCHRONOUS INTERRUPTIONS IN A MAGNETIC SUSPENSION OF A ROTOR |
-
1977
- 1977-01-13 FR FR7700921A patent/FR2377551A1/en active Granted
- 1977-12-30 GB GB54388/77A patent/GB1598800A/en not_active Expired
-
1978
- 1978-01-10 CA CA294,659A patent/CA1099323A/en not_active Expired
- 1978-01-11 DE DE2800999A patent/DE2800999C2/en not_active Expired
- 1978-01-12 IT IT67056/78A patent/IT1106523B/en active
- 1978-01-12 JP JP53002631A patent/JPS5945847B2/en not_active Expired
-
1979
- 1979-10-24 US US06/087,888 patent/US4302061A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| IT7867056A0 (en) | 1978-01-12 |
| DE2800999C2 (en) | 1985-11-07 |
| JPS5388444A (en) | 1978-08-03 |
| DE2800999A1 (en) | 1978-07-27 |
| FR2377551A1 (en) | 1978-08-11 |
| GB1598800A (en) | 1981-09-23 |
| FR2377551B1 (en) | 1979-04-20 |
| US4302061A (en) | 1981-11-24 |
| IT1106523B (en) | 1985-11-11 |
| JPS5945847B2 (en) | 1984-11-09 |
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