Patent ID: 6118360
Filing Date: 2000-09-12
Classification: G01B,G05B,H01F

Abstract:
A linear actuator comprising:a body;a magnetic member mounted on said body and having a ferrite core to establish a permanent magnetic field;a bobbin having an outer surface and a length, and defining a longitudinal axis, said bobbin being slidingly mounted on said body and being formed with an aperture extending through said bobbin along said axis for receiving said ferrite core therethrough, said aperture establishing an inner surface for said bobbin, and said bobbin being formed with a gap to prevent current flow on said inner and outer surface of said bobbin during bobbin movement in said permanent magnetic field, said gap extending through said length and substantially parallel to said axis and intersecting said bobbin from said outer surface to said inner surface;a conductive winding for receiving an electrical current, said winding being wrapped around said outer surface of said bobbin;an electrically conductive cover laminated onto said ferrite core for reducing the magnetic flux from said conductive winding; andan electrical means connected to said winding for applying said current to said winding to generate an applied magnetic field for interaction with said permanent magnetic field to move said bobbin.