US3710291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permanent magnet
Assignee: SERMAG
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Filing: 1971-11-17
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Granted: 1973-01-09
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Expires: 1991-11-17
Abstract
Abstract A permanent magnet is described, which is particularly adapted for use in stators of electric motors or in attraction devices which should present an involved attracting surface, together with high magnetic performance. A plurality of small ferrites pieces are stuck, closely juxtaposed on a flexible sheet of magnetic or non magnetic material. Preferably, the supporting sheet is non magnetic, and the ferrite pieces have a magnetization pattern which alternates the polarities according to a predetermined pitch.
Inventors
- 👤 G Nicoud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:23
CPC Classifications
H; H02; H02K; H02K23/00; H02K23/02; H02K23/04; H01; H01F; H01F7/00; H01F7/02; H01F7/0205; H01F7/021; H01F7/0215; H02K1/00; H02K1/06; H02K1/12; H02K1/17; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/4902; Y10T29/49075
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
88 words
A permanent magnet stator tile apparatus comprising: a supporting member; a plurality of pieces of magnetic material attached to said supporting member at a relatively narrow bottom face thereof each of said pieces of magnetic material aligned relatively closely spaced to the next succeeding piece and magnetized in a direction substantially at right angles therewith, wherein each of said pieces has a thickness dimension substantially smaller than its height; the support member comprises at least one thin and flexible sheet on which the same magnetic pieces are stuck.
Claim 2
Dependent Claim
88 words
A permanent magnet stator tile apparatus comprising: a supporting member; a plurality of pieces of magnetic material attached to said supporting member at a relatively narrow bottom face thereof each of said pieces of magnetic material aligned relatively closely spaced to the next succeeding piece and magnetized in a direction substantially at right angles therewith, wherein each of said pieces has a thickness dimension substantially smaller than its height; the support member comprises at least one thin and flexible sheet on which the same magnetic pieces are stuck.
Claim 3
Dependent Claim
33 words
The permanent magnet stator tile apparatus as described in claim 1, wherein the said magnetic pieces have a magnetization pattern which is uniform, the said support being then made of a magnetic mater-ial.
Claim 4
Dependent Claim
47 words
The permanent magnet as described in claim 1, wherein the said magnetic pieces are shaped as parallelepipeds each having its height dimension at right angles with the support surface, the interval between any two adjacent parallelepipeds being small as compared to the thickness dimension of the parallelepiped,
Claim 5
Dependent Claim
49 words
The permanent magnet as described in claim 1, wherein the said magnetic pieces are ferrite material shaped as parallelepipeds, and stuck to said flexible member comprised of a metal ribbon forming a pole piece and shaped as at least a section of a comparatively thin ring with radial magnetization.
Claim 6
Dependent Claim
105 words
The permanent magnetic stator tile apparatus as described in claim 1, wherein said magnetic pieces are ferrite material shaped as parallelepipeds having a length dimension substantially transverse of said support member, a thickness dimension substantially tangent thereto and a height dimension substantially normal thereto said pieces being magnetized in a direction substantially perpendicular with said support member, wherein each of said pieces are separated by a distance substantially less than its thickness dimension at the point of contact with the support means, and each piece of magnetic material is oriented so as to produce a magnetic field of one polarity in the stator tile assembly.
Claim 7
Dependent Claim
35 words
The apparatus as described in claim 5, further including the stator assembly of selected inner diameter for supporting each stator tile apparatus forming a pole piece shaped as a section of a comparatively thin ring.
Claim 8
Dependent Claim
50 words
The apparatus as described in claim 1, wherein the pieces are lined in a row having their longest side adjacent to each other for a selected number of pieces and spacing between each piece is relatively narrow compared to the thickness of the lower face attached to the support member.
Claim 9
Dependent Claim
53 words
The apparatus as described in claim 1 further including a stator member for supporting an opposite narrow face of each of said pieces within an annular opening thereof, thereof said plurality of pieces and their support member forming a pole piece shaped as a section of a relatively thin ring with radial magnetization.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |