US3652884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric motor for watches
Assignee: Girard Perregaux SA
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Filing: 1970-10-12
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Granted: 1972-03-28
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Expires: 1990-10-12
Abstract
Abstract The present invention concerns an electric motor for watches, composed of a rotor with permanent magnetization, a stator winding without core and with even spirals which presents a symmetrical plane parallel to the spirals and containing the axle of the rotor, a winding support made of nonmagnetic material and an annular yoke made of a ferromagnetic material with high permeability and low remanence surrounding the support.
Inventors
- 👤 Georges C Vuffray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:48
CPC Classifications
G; G04; G04C; G04C15/00; G04C13/00; G04C13/08; G04C13/10; G04C13/11; G04C3/00; G04C3/16; H; H02; H02K; H02K21/00; H02K21/12; H02K21/14; H02K37/00; H02K37/10; H02K37/12; H02K37/14
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
84 words
An electric motor for a watch, comprising: a permanently magnetized rotor; a stator having spiral windings defining a symmetrical plane substantially parallel to the axis of said rotor; a non-magnetic winding support; and an annular yoke of ferromagnetic material having high permeability and low remanence surrounding said support, said yoke including means having an axis of magnetization lying in a plane generally perpendicular to the axis of said yoke, said axis of magnetization being oblique with respect to the magnetic axis of said stator.
Claim 2
Dependent Claim
84 words
An electric motor for a watch, comprising: a permanently magnetized rotor; a stator having spiral windings defining a symmetrical plane substantially parallel to the axis of said rotor; a non-magnetic winding support; and an annular yoke of ferromagnetic material having high permeability and low remanence surrounding said support, said yoke including means having an axis of magnetization lying in a plane generally perpendicular to the axis of said yoke, said axis of magnetization being oblique with respect to the magnetic axis of said stator.
Claim 3
Dependent Claim
42 words
A motor according to claim 14, wherein said yoke comprises at least one pair of diametrically opposed openings extending to the level of said rotor, the central axis of said openings being oblique with respect to the magnetic axis of said stator.
Claim 4
Dependent Claim
33 words
A motor according to claim 14, characterized in that the yoke has a circular cylindrical shape and has two elongated openings both extending over an arc of a circle between 60* and 120*.
Claim 5
Dependent Claim
28 words
A motor according to claim 2, wherein said openings have a central axis inclined towards the magnetic axis of the stator winding by an angle of approximately 30*.
Claim 6
Dependent Claim
43 words
A motor according to claim 2, characterized in that the stretched out form of said openings is that of a rectangle with extremities in a semicircle, the width of the rectangle being at least approximately equal to the axial length of the rotor.
Claim 7
Dependent Claim
47 words
A motor according to claim 2, characterized in that the support is of a generally cylindrical shape, engaged in the yoke, and has two parallel annular grooves in its outside faces, said stator winding being distributed into two wound elements each one in one of said grooves.
Claim 8
Dependent Claim
54 words
A motor according to claim 5, characterized in that the winding support is composed of two elements attached coaxially one to the other, of a generally cylindrical form, defining between them a central cylindrical housing containing the rotor and being equipped with two coaxial bearings immersed in the opposite front surfaces of said housing.
Claim 9
Dependent Claim
32 words
A motor according to claim 6, characterized in that said coaxial support elements are maDe of a plastic material containing a charge of molybdenum bisulphide said bearings being manufactured with said elements.
Claim 10
Dependent Claim
34 words
A motor according to claim 5, characterized in that said yoke is mounted around the support so that it can be displaced rotatably so as to reverse the direction of rotation of the motor.
Claim 11
Dependent Claim
58 words
A motor according to claim 5, characterized in that the bearings of the rotor are interlocked with two elements of the frame of the movement of the watch connected to one another and in that the winding support is held in place between said frame elements by appropriate centering elements offered by the frame elements and the support.
Claim 12
Dependent Claim
24 words
A motor according to claim 9, characterized in that the winding support is composed of two independent coil elements, each element carrying a coil.
Claim 13
Dependent Claim
24 words
A motor according to claim 9 for a wrist watch, characterized in that said frame elements are the mounting plate and a movement bridge.
Claim 14
Dependent Claim
29 words
A motor according to claim 9, characterized in that the centering elements are composed of bases engaged in corresponding forms of the frame elements and of the winding support.
Claim 15
Dependent Claim
34 words
A motor according to claim 9, characterized in that the shaft of the rotor passes through one of the bearings and carries a pinion situated on the outside surface of the corresponding frame element.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-28 | 1975-09-27 | 1976-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-28 | 1979-09-27 | 1980-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-28 | 1983-09-27 | 1984-03-28 | $7700.00 | Window Closed / Lapsed |