US4879485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permanent magnet rotor
Assignee: Mavilor Systemes SA
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Filing: 1988-08-25
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Granted: 1989-11-07
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Expires: 2008-08-25
Abstract
Abstract It comprises a cylinder (2) forming the rotor body, extended on each side by the shaft (1), and eight curved permanent magnets (3A to 3H) disposed on the cylindrical surface of the rotor body (2). The magnets (3A to 3H) are secured by adhesive bonding to the rotor (2) and because of their shape leave between them, in the axial direction, V-shaped interstices (a to h). A thread (5) of carbon fibers passes in succession in each of the interstices (a to h) a plurality of times, applying compression forces to the inclined faces of the magnets (3A to 3H), which are thus firmly held against the rotor. The interstices are then filled with a resin to obtain a continuous cylindrical surface.
Inventors
- 👤 Giampiero Tassinario
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:39
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/22; H02K1/27; H02K1/2706; H02K1/272; H02K1/274; H02K1/2753; H02K1/278
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
110 words
A permanent magnet rotor for an electric motor, the rotor comprising a cylinder forming its body and provided with a plurality of curved permanent magnets disposed on the periphery of the cylinder, and secured in a predetermined manner to the body of the rotor, wherein the magnets are secured by adhesive bonding to the rotor and spaced apart in the peripheral direction so as to form axial interstices, wherein said interstices are partly filled with continuous tensioned thread of nonmagnetic material which passes from one interstice to another, passing alternately over plane faces of the rotor, and that the remainder of space in each interstice is filled with a resin.
Claim 2
Dependent Claim
110 words
A permanent magnet rotor for an electric motor, the rotor comprising a cylinder forming its body and provided with a plurality of curved permanent magnets disposed on the periphery of the cylinder, and secured in a predetermined manner to the body of the rotor, wherein the magnets are secured by adhesive bonding to the rotor and spaced apart in the peripheral direction so as to form axial interstices, wherein said interstices are partly filled with continuous tensioned thread of nonmagnetic material which passes from one interstice to another, passing alternately over plane faces of the rotor, and that the remainder of space in each interstice is filled with a resin.
Claim 3
Dependent Claim
33 words
A rotor as claimed in claim 1, wherein after having passed at least once in all the interstices the thread passes at least a second time in the opposite direction in the interstices.
Claim 4
Dependent Claim
43 words
A rotor as claimed in claim 2 wherein the plane faces of each magnet parallel to the axis of the rotor being inclined in such a manner that an adjacent plane face of two magnets following one another in peripheral direction diverge outwardly.
Claim 5
Dependent Claim
35 words
A rotor as claimed in claim 3, wherein the thread bears against a member of nonmagnetic material which is disposed at the bottom of each interstice and has a shape matching that of the interstice.
Claim 6
Dependent Claim
29 words
A rotor as claimed in claim 4, wherein the thread passes from one terstice to another in such a manner as to leave at least one interstice between them.
Claim 7
Dependent Claim
67 words
A rotor as claimed in one of claim 4, wherein the thread passes from one interstice to another in such a manner that that portion of the thread which bears against one of the plane faces of the rotor is at least approximately straight and as close as possible to the diameter of the plane face of the rotor, allowing for the presence of a rotor shaft.
Claim 8
Dependent Claim
15 words
A rotor as claimed in claim 6, wherein the thread is a carbon fiber thread.
Claim 9
Dependent Claim
15 words
A rotor as claimed in claim 6, wherein the thread is a glass fiber thread.
Claim 10
Dependent Claim
15 words
A rotor as claimed in claim 4, wherein said member is a folded brass plate.
Claim 11
Dependent Claim
23 words
A rotor as claimed in claim 9, wherein each magnetic pole is formed in the axial direction of a plurality of juxtaposed magnets.
Claim 12
Dependent Claim
27 words
A rotor as claimed in claim 10, wherein the outer surface of the rotor is a perfectly continuous cylinder after the interstices have been filled with resin.
References Cited (Backward Citations)
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Cited
GB774195A
Cited
SU454636A1
Cited
US4219752A
Cited
US4434546A
Cited
US4683388A
Cited
US4714852A
Cited
US4674178A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-06 | 1993-05-08 | 1993-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-06 | 1997-05-08 | 1997-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-06 | 2001-05-08 | 2001-11-07 | $7700.00 | Window Closed / Lapsed |