Method of manufacturing stators for stepping motors
First Claim
1. A method of manufacturing stators for stepping motors of electronic watches, wherein the improvement comprises the steps of:
- partially blanking from a strip of ferromagnetic metal coil cores each having an elongated center portion and widened end portions,depositing a mask on the marginal zones of one face of said strip in such a way as to cover said widened portions,forming thin, adherent, insulating films of resin on the non-masked portions of said strip by electrophoresis,removing said mask,completing said blanking, andforming coils by winding insulated wire over said insulating films along each said center portion of said cores.
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Accused Products
Abstract
A stator for a stepping motor comprises a cylindrical coil of compact size formed by winding wire directly on the center portion of a core. This center portion is coated with a film formed of a hard, compact insulating material adhering strongly to the core. An electrophoresis operation is used to obtain a film of minimum thickness in an efficient manner. The core includes end lugs which are bare on one face so that metallic contact can be established with the pole pieces of the stator. Prior to electrophoresis, the faces of the lugs intended to be bare are covered with a mask of synthetic material, preferably deposited while dissolved in a suitable solvent.
14 Citations
6 Claims
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1. A method of manufacturing stators for stepping motors of electronic watches, wherein the improvement comprises the steps of:
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partially blanking from a strip of ferromagnetic metal coil cores each having an elongated center portion and widened end portions, depositing a mask on the marginal zones of one face of said strip in such a way as to cover said widened portions, forming thin, adherent, insulating films of resin on the non-masked portions of said strip by electrophoresis, removing said mask, completing said blanking, and forming coils by winding insulated wire over said insulating films along each said center portion of said cores. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification