US5861695A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite inductor for electric rotary machines comprising sintered permanent magnets coated with a ferromagnetic binder
Assignee: Ugimag SA
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Filing: 1996-02-13
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Granted: 1999-01-19
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Expires: 2016-02-13
Abstract
Abstract An inductor for an electrical rotary machine having a hollow or solid cylindrical yoke with a side wall to which is attached at least one sintered magnet having a pole face disposed facing an armature. The magnet is attached to the yoke by an over-molding which coats at least the pole face with a composite over-molding material containing a ferromagnetic material dispersed in a solid non-magnetic binder.
Inventors
- 👤 Serge Brassard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:10
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/22; H02K1/27; H02K1/2786; H02K1/2787; H02K1/2788; H02K1/12; H02K1/17
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
71 words
An inductor for an electric rotary machine comprising a hollow or solid cylindrical yoke having a side wall to which is attached at least one sintered magnet having a pole face disposed facing an armature, the at least one sintered magnet being attached to the yoke by an over-molding which coats at least said pole face with a composite over-molding material comprising a ferromagnetic material dispersed in a solid non-magnetic binder.
Claim 2
Dependent Claim
71 words
An inductor for an electric rotary machine comprising a hollow or solid cylindrical yoke having a side wall to which is attached at least one sintered magnet having a pole face disposed facing an armature, the at least one sintered magnet being attached to the yoke by an over-molding which coats at least said pole face with a composite over-molding material comprising a ferromagnetic material dispersed in a solid non-magnetic binder.
Claim 3
Dependent Claim
37 words
An inductor according to claim 1, wherein the cylindrical yoke is hollow and the at least one sintered magnet is attached to an inner side wall of the yoke, with the armature being disposed inside the inductor.
Claim 4
Dependent Claim
37 words
An inductor according to claim 1, wherein the cylindrical yoke is solid or hollow and the at least one sintered magnet is attached to an outer side wall of the yoke, the armature thus surrounding the inductor.
Claim 5
Dependent Claim
19 words
An inductor according to claim 1, wherein an air gap is defined between the over-molding material and the armature.
Claim 6
Dependent Claim
18 words
An inductor according to claim 4, wherein the air gap has a thickness always less than 0.7 mm.
Claim 7
Dependent Claim
18 words
An inductor according to claim 5, wherein the air gap has a thickness always less than 0.3 mm.
Claim 8
Dependent Claim
22 words
An inductor according to claim 1, wherein the over-molding material covering the pole face has a thickness between 0.5 and 5 mm.
Claim 9
Dependent Claim
39 words
An inductor according to claim 1, wherein the over-molding material and the at least one magnet form a rigid assembly inserted into the yoke or obtained by the injection, extrusion, compaction or molding of said material into the yoke.
Claim 10
Dependent Claim
22 words
An inductor according to claim 1, wherein leaks of magnetic flux along lateral surfaces of the at least one magnet are minimized.
Claim 11
Dependent Claim
22 words
An inductor according to claim 9, wherein the over-molding material along the lateral surfaces has a thickness of less than 5 mm.
Claim 12
Dependent Claim
23 words
An inductor according to claim 1, wherein the at least one magnet is a permanent magnet based on ferrites or on rare earths.
Claim 13
Dependent Claim
17 words
An inductor according to claim 1, wherein the over-molding material has a magnetic permeability greater than 2.
Claim 14
Dependent Claim
18 words
An inductor according to claim 12, wherein the over-molding material has a magnetic permeability between 4 and 40.
Claim 15
Dependent Claim
35 words
An inductor according to claim 1, wherein the ferromagnetic material dispersed in the non-magnetic binder is a soft ferromagnetic metal containing at least one element selected from the group consisting of Fe, Co and Ni.
Claim 16
Dependent Claim
18 words
An inductor according to claim 1, wherein the solid magnetic binder is based on thermosetting or thermoplastic resin.
References Cited (Backward Citations)
US3899702A
Cited
FR2617344A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-01-18 | 2002-07-20 | 2003-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-01-18 | 2006-07-20 | 2007-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-01-18 | 2010-07-20 | 2011-01-19 | $7700.00 | Window Closed / Lapsed |