Electric motor for watches

Claim 2

An electric motor for a watch comprising: a cylindrical rotor diametrically permanently magnetized; a non-magnetic coil support; two stator coils having flat turns parallel to the axis of said rotor carried on said support member; wherein, in an area adjacent said rotor, said stator coils are supported on said support at their end portions, with central portions of said coils extending unsupported over the adjacent surfaces of said rotor.

Claim 3

A motor according to claim 1, wherein said coil support is formed of two bodies, each having a concave face in the shape of a cylindrical arc, each bearing at least a first portion of said stator coil and fastened opposite each other between said frame elements such that said central portions of said coils at least partially enclose said cylindrical rotor.

Claim 4

A motor according to claim 2, wherein said coil bodies are positioned between said frame elements by guide feet.

Claim 5

A motor according to claim 1, wherein said coil support comprises a part cylindrically shaped member having an axial bore therethrough and having in its cylindrical side face and its front faces two annular grooves extending along planes parallel to the axis of said member.

Claim 6

An electric motor for a wrist watch, comprising: a cylindrical rotor diametrically permanently magnetized; a coil support member made of a single piece of a non-magnetic material; a cylindrical passage extending through said support member for lodging said rotor; a pair of annular grooves provided in the outer side face and both front faces of said support member, said grooves extending parallel to one another and symmetrically with respect to the axis of said cylindrical passage and parallel to said axis; a pair of driving coils having flat turns and wound each in one of said grooves, said coils having front sides which are supported only at their end portions by said support member, whereas the central portion of each front side extends unsupported over the adjacent surface of sAid rotor.

Claim 7

An electric motor for a wrist watch, comprising: a cylindrical rotor diametrically permanently magnetized; a coil support member made of a single piece of a non-magnetic material; a cylindrical passage extending through said support member for lodging said rotor; a pair of annular grooves provided in the outer side face and both front faces of said support member, said grooves extending parallel to one another and symmetrically with respect to the axis of said cylindrical passage and parallel to said axis; a pair of driving coils having flat turns and wound each in one of said grooves, said coils having front sides which are supported only at their end portions by said support member, whereas the central portion of each front side extends unsupported over the adjacent surface of sAid rotor.

Claim 8

An electric motor according to claim 5, further comprising: two frame elements fixedly connected to one another; a pair of bearings each secured to one of said frame elements; and a shaft which supports said rotor; said support member being secured between said frame elements, and said shaft having two end portions each engaging one of said bearings.

Claim 9

An electric motor according to claim 6, wherein said support member side face is of cylindrical shape and wherein a cylindrical shield member of a ferromagnetic material of high permeability and low remanence is provided, said shield member extending around said support member and said coils and being held in place by said frame elements.

Claim 10

A motor according to claim 7, wherein said frame elements comprise the pillor plate and a bridge of said watch.

Claim 11

A motor according to claim 7, wherein said frame elements are fastened to each other, and said coil support is positioned between these frame elements by guide feet.

Claim 12

An electric motor for a wrist watch, comprising: a cylindrical rotor diametrically permanently magnetized; a coil support comprising two parts of a non-magnetic material, each part having a concave inner side face in the shape of a cylindrical arc and an annular groove provided in the outer side and the front faces of each part, parallel to the axis of said cylindrical face; a pair of driving coils having flat turns and wound each in one of said grooves, said coils having front sides which extend each at one end of said concave faces and are supported at their end portions by one of the support parts; a pair of frame elements fixedly connected to one another; a pair of bearings each secured to one of said frame elements; and a shaft which supports said rotor; both said support parts being held by said frame elements in such positions that said concave faces surround said rotor coaxially, and central portions of each front side of the coils extend unsupported over an adjacent surface of said rotor, said shaft having two end portions which each engage one of said bearings.

Claim 13

An electric motor for a wrist watch, comprising: a cylindrical rotor diametrically permanently magnetized; a coil support comprising two parts of a non-magnetic material, each part having a concave inner side face in the shape of a cylindrical arc and an annular groove provided in the outer side and the front faces of each part, parallel to the axis of said cylindrical face; a pair of driving coils having flat turns and wound each in one of said grooves, said coils having front sides which extend each at one end of said concave faces and are supported at their end portions by one of the support parts; a pair of frame elements fixedly connected to one another; a pair of bearings each secured to one of said frame elements; and a shaft which supports said rotor; both said support parts being held by said frame elements in such positions that said concave faces surround said rotor coaxially, and central portions of each front side of the coils extend unsupported over an adjacent surface of said rotor, said shaft having two end portions which each engage one of said bearings.

Claim 14

An electric motor according to claim 10, further comprising a cylindrical shield member of a ferromagnetic material of high permeability and low remanence, lodged between said frame elements, surrounding both said support parts and said coils and held in place by said frame elements.

Claim 15

A motor according to claim 7, wherein one of the end portions of said shaft projects through said bearing on the outer side of the corresponding frame element, said projecting end portion being intended to receive a pinion.