Stepping motor with rotor-positioning magnet
AssigneeFabriques d'Horlogerie de Fontainemelon S.A.
InventorJean-Pierre Calame
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Abstract
A ring (16) of non-magnetic material is engaged in the opening bounded by the pole shoes (6,7) of a pole plate (5), between the pole shoes and the rotor (12). A magnet (18) serving to define the position of rest of the rotor is mounted on this ring, which can be accurately positioned by means of a slot (11) provided in the pole plate.
Claims9
A miniature stepping motor comprising a stator having two pole shoes bounding a generally circular opening, two bearings, a rotor located in said opening and pivotally mounted on said bearings, a ring of a non-magnetic material provided with a socket and engaged in said opening between said rotor and said pole shoes and a magnet disposed in said socket, said magnet defining a position of rest of said rotor.
Dependencies are inferred from the claim text.