EP0136865A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Electromagnetic bearing
Assignee: Toshiba Corp
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Filing: 1984-09-18
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Granted: —
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Expires: 2004-09-18
Abstract
Abstract A group of magnetic poles (74, 78) is formed on each end of a columnar yoke (72). The magnetic pole groups each include four magnetic poles (74a, 74b, 74c, 74d, 78a, 78b, 78c, 78d) which protrude from the center of the yoke at right angles to one another and to the longitudinal direction of the yoke. A cylindrical supported body (54) surrounds the yoke and the magnetic poles. A ring-shaped member (68) formed of a ferromagnetic material is fixed to the inner peripheral surface of the supported body so that both end portions of the ring-shaped member are in alignment with the centers of their corresponding magnetic poles of the magnetic pole groups. Coils (76a, 76b, 76c, 76d, 80a, 80b, 80c, 80d) are wound around the individual magnetic poles of the magnetic pole groups, whereby loops are formed along which magnetic fluxes delivered from each aligned pair of magnetic poles enter the ring-shaped member substantially at right angles to the peripheral surface thereof, and return to those original magnetic poles via another pair of magnetic poles adjacent thereto. Thus, the supported body is supported in its radial direction. A coil (82) is wound around the yoke, whereby loops are formed along which magnetic fluxes pass through the yoke along its longitudinal direction, enter one end face of the ring-shaped member at right angles thereto via the magnetic poles of the first magnetic pole group, pass through the ring-shaped member along its longitudinal direction, and enter the magnetic poles of the second magnetic pole group via the other end face of the ring-shaped member. Thus, the supported body is supported in its longitudinal direction.
Inventors
- 👤 Hajime Sudo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 20:12
CPC Classifications
F; F16; F16C; F16C32/00; F16C32/04; F16C32/0406; F16C32/044; F16C32/0459; F16C32/0461; F16C32/0465; F16C32/0474; H; H01; H01J; H01J35/00; H01J35/02; H01J35/04; H01J35/08; H01J35/10; H01J35/101; H01J35/1017; H01J35/103; F16C2300/00; F16C2300/20; F16C2380/00; F16C2380/16
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
307 words
An electromagnetic bearing comprising: magnetic supporting means (70, 120) including an elongated yoke (72, 122), first and second groups of magnetic poles (74, 78, 124, 128) on the yoke spaced along the longitudinal direction of the yoke, each member of said group including a plurality of magnetic poles (74a, 74b, 74c, 74d, 78a, 78b, 78c, 78d, 124a, 124b, 124c, 124d, 128a, 128b, 128c, 128d) protruding from the yoke perpendicular to the longitudinal direction of the yoke, first and second groups of coils (76, 80, 126, 130) including a plurality of first and second coils (76a, 76b, 76c, 76d, 80a, 80b, 80c, 80d, 126a, 126b, 126c, 126d, 130a, 130b, 130c, 130d) wound around the first and second groups of magnetic poles, each of said coil being adapted to produce magnetic flux along the protruding direction of each corresponding pole, and a third coil (82, 132) for producing magnetic flux along the longitudinal direction of the yoke; and a supported body (54, 140) including a magnetic coupling member (68, 148) formed of a ferromagnetic material, characterized in that said magnetic coupling member (68, 148) extends along the longitudinal direction of the yoke (72, 122) and has end portions aligned individually with the first and second groups of magnetic poles (74, 78, 124, 128), whereby magnetic fluxes (4, 6) in order to enter and leave the magnetic coupling member in the direction substantially perpendicular to the longitudinal direction of the magnetic coupling member are formed between the magnetic poles and the magnetic coupling member by the first and second coils, and magnetic fluxes (2) which enter and leave the magnetic coupling member substantially at right angles to the end faces thereof are formed between the magnetic poles and the magnetic coupling member by the third coil, so that the supported body is supported in suspension by the magnetic supporting means.
Claim 2
Dependent Claim
307 words
An electromagnetic bearing comprising: magnetic supporting means (70, 120) including an elongated yoke (72, 122), first and second groups of magnetic poles (74, 78, 124, 128) on the yoke spaced along the longitudinal direction of the yoke, each member of said group including a plurality of magnetic poles (74a, 74b, 74c, 74d, 78a, 78b, 78c, 78d, 124a, 124b, 124c, 124d, 128a, 128b, 128c, 128d) protruding from the yoke perpendicular to the longitudinal direction of the yoke, first and second groups of coils (76, 80, 126, 130) including a plurality of first and second coils (76a, 76b, 76c, 76d, 80a, 80b, 80c, 80d, 126a, 126b, 126c, 126d, 130a, 130b, 130c, 130d) wound around the first and second groups of magnetic poles, each of said coil being adapted to produce magnetic flux along the protruding direction of each corresponding pole, and a third coil (82, 132) for producing magnetic flux along the longitudinal direction of the yoke; and a supported body (54, 140) including a magnetic coupling member (68, 148) formed of a ferromagnetic material, characterized in that said magnetic coupling member (68, 148) extends along the longitudinal direction of the yoke (72, 122) and has end portions aligned individually with the first and second groups of magnetic poles (74, 78, 124, 128), whereby magnetic fluxes (4, 6) in order to enter and leave the magnetic coupling member in the direction substantially perpendicular to the longitudinal direction of the magnetic coupling member are formed between the magnetic poles and the magnetic coupling member by the first and second coils, and magnetic fluxes (2) which enter and leave the magnetic coupling member substantially at right angles to the end faces thereof are formed between the magnetic poles and the magnetic coupling member by the third coil, so that the supported body is supported in suspension by the magnetic supporting means.
Claim 3
Dependent Claim
95 words
The electromagnetic bearing according to claim 1, characterized in that each of said first and second groups of magnetic poles (74, 78, 124, 128) includes four magnetic poles (74a, 74b, 74c, 74d, 78a, 78b, 78c, 78d, 124a, 124b, 124c, 124d, 128a, 128b, 128c, 128d), and a segment connecting the opposite two out of the four magnetic poles (74a, 74c, 78d, 78c, 124a, 124c, 128a, 128c) and a segment connecting the other two magnetic poles (74b, 74d, 78b, 78d, 124b, 124d, 128b, 128d) which intersect at right angles on the middle point of each said segment.
Claim 4
Dependent Claim
81 words
The electromagnetic bearing according to claim 2, characterized in that said supported body (54) includes a cylindrical member (56) formed of a nonmagnetic material, and said magnetic coupling member (68) is in the form of a hollow cylinder fixed inside the cylindrical member (56), and said magnetic supporting means (70) is disposed inside the magnetic coupling member so that the centers of arrangement of the magnetic poles (74, 78) are in alignment with the center of the magnetic coupling member (68).
Claim 5
Dependent Claim
38 words
The electromagnetic bearing according to claim 3, characterized in that said yoke (72) is columnar, and said third coil (82) is wound around that portion of the yoke between the first and second magnetic pole groups (74, 78).
Claim 6
Dependent Claim
81 words
The electromagnetic bearing according to claim 2, characterized in that said supported body (140) includes a cylindrical member (142) formed of a nonmagnetic material, and said magnetic coupling member (148) is in the form of a hollow cylinder fitted on the cylindrical member, and said magnetic supporting member (120) is disposed outside the magnetic coupling member (148) so that the centers of arrangement of the magnetic poles (124, 128) are in alignment with the center of the magnetic coupling member (148).
Claim 7
Dependent Claim
39 words
The electromagnetic bearing according to claim 5, characterized in that said yoke (122) is in the form of a hollow cylinder, and each of said magnetic (124, 128) poles protrudes from the yoke toward the axis of the yoke.
Claim 8
Dependent Claim
44 words
The electromagnetic bearing according to claim 6, characterized in that said third coil (132) is disposed in contact with the inner peripheral surface of the yoke (122) so that the axis of the third coil (132) is in alignment with that of the yoke.
Claim 9
Dependent Claim
44 words
The electromagnetic bearing according to claim 1, characterized by further comprising a permanent magnet (150) to form a magnetic flux (152) extending along the longitudinal direction of the yoke (72) and the magnetic coupling member (68) and serving as a DC bias magnetic force.
Claim 10
Dependent Claim
31 words
The electromagnetic bearing according to claim 7, characterized in that said yoke (72) is columnar, and said permanent magnetic (150) is in the form of a ring fitted on the yoke.
Claim 11
Dependent Claim
34 words
The electromagnetic bearing according to claim 1, characterized by further comprising a case (50) formed of a material capable of intercepting magentism and adapted to contain the magnetic supporting means and the supported body.
Claim 12
Dependent Claim
38 words
The electromagnetic bearing according to claim 1, characterized by further comprising a plurality of sensors (100, 102) for detecting the position of the supported body (54, 140) in the direction perpendicular to the longitudinal direction of the yoke.
Claim 13
Dependent Claim
31 words
The electromagnetic bearing according to claim 11, characterized by further comprising a sensor (104) for detecting the position of the supported body (54, 140) in the longitudinal direction of the yoke.
Claim 14
Dependent Claim
62 words
The electromagnetic bearing according to claim 1, characterized in that said supported body includes a cylindrical member (56, 142) formed of a nonmagnetic material, said electromagnetic bearing characterized by further comprising a motor (92) including a rotor (98) disposed on the outer peripheral surface of the cylindrical member and a stator (94) provided on the case, whereby the supported member is rotated.
Claim 15
Dependent Claim
70 words
The electromagnetic bearing according to claim 10, characterized in that said supported body includes a cylindrical member (56) having projecting peripheral wall portions (60, 62) formed at the upper and lower ends thereof, said electromagnetic bearing characterized by further comprising bearing means (90, 91) provided on the case (50) and adapted to engage the projecting peripheral wall portions when the supported body is not supported by the magnetic supporting means.
References Cited (Backward Citations)
No citation records indexed.
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