US5334893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monophase electromagnetic rotary actuator of travel between 60 and 120 degrees
Assignee: Moving Magnet Technologie SA
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Filing: 1993-02-26
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Granted: 1994-08-02
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Expires: 2013-02-26
Abstract
Abstract This invention relates to a monophase electromagnetic rotary actuator of angular travel between 70/N and 110/N degrees exhibiting a high torque/mass ratio and a torque that is approximately independent of the angular position of the rotor. A relation between the magnetized width Y a measured on the mean diameter of the magnets, the width of the angular arc C through which the rotor passes on the mean diameter of the magnets, the width S measured on the mean diameter of the magnets between two adjacent stator poles, the radial length of the magnets L, and the constant length E of the air gap is: Y.sub.a =C+S +2 E' where E' is between E/2 and E. Furthermore, C+2 E'/E >6 and L/E>0.75.
Inventors
- 👤 Claude Oudet
- 👤 Daniel Prudham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:03
CPC Classifications
H; H02; H02K; H02K26/00; H01; H01F; H01F7/00; H01F7/06; H01F7/08; H01F7/14; H01F7/145
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
203 words
A monophase electromagnetic rotary actuator of angular travel between 70/N and 110/N degrees comprising: a rotor exhibiting 2N magnets, N being equal to 1 or to 2, and a core of a material of high magnetic permeability; a stator exhibiting two pole pieces joined by at least one connecting part supporting at least one coil, the two pole pieces and the core of the rotor defining between them an air gap of constant length E, wherein the 2N magnets have a reversible permeability close to 1 and wherein a relation between a magnetized width Y a of one of the 2N magnets measured on a mean diameter of the magnets, a width of an angular arc C through which the rotor passes on the mean diameter of the magnets, a width S measured on the mean diameter of the magnets between two adjacent stator poles and a constant length E of the air gap is Y.sub.a =C+S+2 E' where: E' is between E/2 and E and wherein: C+2 E'/E and wherein L/E>0.75; L designating a radial length of one of the 2N magnets; to obtain a high torque/mass ratio and a torque that is approximately independent of the angular position of the rotor.
Claim 2
Dependent Claim
203 words
A monophase electromagnetic rotary actuator of angular travel between 70/N and 110/N degrees comprising: a rotor exhibiting 2N magnets, N being equal to 1 or to 2, and a core of a material of high magnetic permeability; a stator exhibiting two pole pieces joined by at least one connecting part supporting at least one coil, the two pole pieces and the core of the rotor defining between them an air gap of constant length E, wherein the 2N magnets have a reversible permeability close to 1 and wherein a relation between a magnetized width Y a of one of the 2N magnets measured on a mean diameter of the magnets, a width of an angular arc C through which the rotor passes on the mean diameter of the magnets, a width S measured on the mean diameter of the magnets between two adjacent stator poles and a constant length E of the air gap is Y.sub.a =C+S+2 E' where: E' is between E/2 and E and wherein: C+2 E'/E and wherein L/E>0.75; L designating a radial length of one of the 2N magnets; to obtain a high torque/mass ratio and a torque that is approximately independent of the angular position of the rotor.
Claim 3
Dependent Claim
75 words
The monophase electromagnetic rotary actuator according to claim 1, wherein the 2N magnets of the rotor comprise radially magnetized magnets in a shape of cylindrical tiles with the peripheral width Y a measured on the mean diameter D m of the magnets, wherein said 2N magnets extend over angular sections between 80/N degrees and 130/N degrees, and wherein the stator part has 2N pole pieces cooperating with the magnet, connected by a U-shaped connecting part.
Claim 4
Dependent Claim
54 words
The monophase electromagnetic rotary actuator according to claim 1, wherein the 2N magnets of the rotor comprise transversely magnetized magnets in a shape of disk sectors extending over angular sections between 80/N and 130/N degrees, and wherein the stator part has 2N pole pieces cooperating with the magnet, connected by a U-shaped connecting part.
Claim 5
Dependent Claim
33 words
The monophase electromagnetic rotary actuator according to either of claims 2 or 3, wherein a median section plane of the U-shaped connecting part is perpendicular to an axis of rotation of the rotor.
Claim 6
Dependent Claim
43 words
The monophase electromagnetic rotary actuator according to either of claims 2 or 3, wherein a median section plane of the U-shaped connecting part is parallel to a plane of symmetry of the pole pieces and contains an axis of rotation of the rotor.
Claim 7
Dependent Claim
39 words
The monophase electromagnetic rotary actuator according to any one of claims 1-3, wherein the stator part has two coils each surrounding one of the two pole pieces, said two pole pieces being joined by at least one connecting part.
Claim 8
Dependent Claim
35 words
The monophase electromagnetic rotary actuator according to any one of claims 2 or 3, wherein the two pole pieces of the stator are joined by two diametrically opposite connecting parts each carrying an excitation coil.
Claim 9
Dependent Claim
72 words
The monophase electromagnetic rotary actuator according to any one of claims 1-3, wherein the width S measured on the mean diameter D m of the magnets between two consecutive stator poles is between E/2 and E, and wherein the peripheral width Y a of the magnets measured on the mean diameter D m of the magnets is: Y.sub.a =C+2 E'+S≈C+3 E', and wherein the two magnets extend over arcs less than 180°/N.
Claim 10
Dependent Claim
68 words
The monophase electromagnetic rotary actuator according to any one of claims 1-3, wherein a width Y s of a stator pole measured on the mean diameter D m of the magnets is equal to: Y.sub.s =C+2 E'+T ≈C+3 E', where T designates a transition zone between two adjacent magnets of the rotor, T being less than E, and wherein the 2N magnets extend over arcs less than 180°/N.
Claim 11
Dependent Claim
49 words
The monophase electromagnetic rotary actuator according to either of claims 2 or 3, wherein a section of the stator connecting part is approximately equal to C×Z, where: Z designates a height of the magnets, measured according to a dimension perpendicular to their displacement and to their direction of magnetization.
Claim 12
Dependent Claim
105 words
The monophase electromagnetic rotary actuator according to either of claims 2 or 3, wherein the stator structure comprises two parallel lamination packets, said packets being assembled perpendicularly, the first of said lamination packets defining the stator pole pieces comprising laminations placed perpendicularly to the axis of rotation, the second lamination packet defining the U-shaped connecting part and comprising laminations parallel to a plane of symmetry of the stator passing through the middle of the stator poles and containing the axis of rotation of the rotor and passing through the stator poles, the laminations exhibiting cutouts for the relative fitting and positioning of said lamination packets.
Claim 13
Dependent Claim
56 words
The monophase electromagnetic rotary actuator according to claim 11, wherein the first lamination packet defining pole pieces comprises two series of pole laminations with a shape that is symmetrical in relation to the median plane of the actuator and has at each end a single lamination corresponding to said pole laminations joined by 2N saturable isthmuses.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-08-01 | 1998-01-31 | 1998-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-01 | 2002-01-31 | 2002-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-01 | 2006-01-31 | 2006-08-02 | $7700.00 | Window Closed / Lapsed |