Patent ID: 6960850
Filing Date: 2005-11-01
Classification: H02K

Abstract:
1. An electromagnetic device mounted to an automotive transmission and used in an oil containing sulfur, said electromagnetic device comprising: an outer casing: a moveable shaft supported by said casing; a bobbin disposed inside said outer casing so as to be disposed around said moveable shaft on a common axis with said moveable shaft; a coil embedded in an outer molding, said coil being constructed by winding a conducting wire onto said bobbin, an electrically-insulating layer coated on said conducting wire; and means for preventing sulfur compounds present in the oil from permeating said electrically-insulating layer and attendantly reducing the formation of sulfur compounds on a surface of said conducting wire, thereby suppressing the reduction in adhesive of the electrically-insulating layer to said conducting wire, wire breakage, and short circuiting between said conducting wires, said preventing means comprising said electrically-insulating layer being of a material resistant to permeation by the sulfur compounds.