US3813566A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic motive device
Assignee: Lewis Engineering Co
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Filing: 1972-12-26
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Granted: 1974-05-28
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Expires: 1992-12-26
Abstract
Abstract A high torque electromagnetic motive device comprising a permanent magnet slab having north and south poles respectively at its opposite sides, and comprising two essentially flat pole pieces each of annular configuration and each having a pair of corresponding portions engaged broadside with the opposite sides of the permanent magnet. Other portions of the pole pieces are disposed in spaced relation to one another so as to define an air gap. The device includes a coil in the form of a loop, which links one of the pole pieces, and means for movably mounting the coil to enable it to travel in an arcuate path in said air gap and along an annular portion of the pole piece that it links. The arrangement is such that an especially large angular displacement of the coil in excess of 200* is made possible, combined with high torque and low power consumption.
Inventors
- 👤 H Edwards
- 👤 L Pannullo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:03
CPC Classifications
G; G01; G01R; G01R5/00; G01R5/02; G01R5/08
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
105 words
A high torque electromagnetic motive device comprising, in combination: a. a permanent magnet having north and south poles respectively at its opposite sides, b. a pair of pole pieces of annular configuration having corresponding face portions disposed respectively against the opposite sides of said magnet, c. other portions of said pole pieces being disposed in spaced apart relation with respect to each other and forming an air gap, d. a loop-shaped coil physically linking one of said pole pieces, and e. means mounting the coil for arcuate movement along an annular portion of said one pole piece and in a path containing said air gap.
Claim 2
Dependent Claim
105 words
A high torque electromagnetic motive device comprising, in combination: a. a permanent magnet having north and south poles respectively at its opposite sides, b. a pair of pole pieces of annular configuration having corresponding face portions disposed respectively against the opposite sides of said magnet, c. other portions of said pole pieces being disposed in spaced apart relation with respect to each other and forming an air gap, d. a loop-shaped coil physically linking one of said pole pieces, and e. means mounting the coil for arcuate movement along an annular portion of said one pole piece and in a path containing said air gap.
Claim 3
Dependent Claim
145 words
The invention as defined in claim 1, and further including: a. an additional permanent magnet having north and south poles respectively at its opposite sides, b. said magnet having one of its sides disposed against a face portion of one of said pole pieces opposite the face portion thereof engaged by said first magnet, like poles of the magnets engaging said one pole piece, and c. an additional pole piece of annular configuration having a face portion disposed against the other side of said additional magnet, d. other portions of said additional pole piece being disposed in spaced relation with respect to said one pole piece, whereby the latter constitutes the center one of the pole pieces, e. a portion of said coil travelling in a path defined by the space between said other portion of the additional pole piece and said one pole piece.
Claim 4
Dependent Claim
43 words
The invention as set forth in claIm 2, wherein: a. said center pole piece has a thickness greater than that of the other two pole pieces, to enable it to carry the combined magnetic flux of the other two substantially without increased saturation.
Claim 5
Dependent Claim
21 words
The invention as set forth in claim 1, wherein: a. said pole pieces comprise flat rings respectively, having substantially circular outlines.
Claim 6
Dependent Claim
34 words
The invention as set forth in claim 1, wherein: a. one of said pole pieces has a radially extending slot to enable portions of it to be inserted in the coil for linkage therewith.
Claim 7
Dependent Claim
33 words
The invention as set forth in claim 2, wherein: a. said center pole piece has a radially extending slot to enable portions of it to be inserted in the coil for linkage therewith.
Claim 8
Dependent Claim
30 words
The invention as set forth in claim 1, wherein: a. said permanent magnet comprises a flat slab having opposite sides of relatively large expanse as compared with the thickness thereof.
Claim 9
Dependent Claim
30 words
The invention as set forth in claim 2, wherein: a. said permanent magnets comprise flat slabs, respectively, having opposite sides of relatively large expanse as compared with the thicknesses thereof.
Claim 10
Dependent Claim
43 words
The invention as set forth in claim 2, wherein: a. at least one of said pole pieces has a tapered thickness to render more uniform the magnetic flux density in the air gaps between said center pole piece and the other pole pieces.
Claim 11
Dependent Claim
31 words
The invention as set forth in claim 2, wherein: a. the two outer pole pieces each have tapered thicknesses to render more uniform the magnetic flux density in the air gaps.
Claim 12
Dependent Claim
48 words
The invention as set forth in claim 2, wherein: a. at least two said pole pieces are disposed in convergent planes to render more uniform the magnetic flux density in the air gap, b. said magnets being disposed between the most widely spaced portions of the pole pieces.
Claim 13
Dependent Claim
37 words
The invention as set forth in claim 1, wherein: a. at least one of said pole pieces has a tapered width to render more uniform the magnetic flux density in the air gap between the pole pieces.
Claim 14
Dependent Claim
41 words
The invention as set forth in claim 2, wherein: a. at least one of said pole pieces has a tapered width to render more uniform the magnetic flux density in at least one of the air gaps between the pole pieces.
Claim 15
Dependent Claim
21 words
The invention as set forth in claim 13, wherein: a. the center one of the pole pieces has the tapered width.
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) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |