Electromagnetic actuator

A method of manufacturing an electromagnetic actuator having a magnetic coil, a yoke, a moving core and a fixed core, comprising steps of:

• plastically deforming magnetic material to be magnetized by magnetic force exerted on energizing the magnetic coil so that the yoke is formed in shape of a cylinder having a bottom at an axial end and an opening at the other axial end;
• plastically deforming magnetic material to be magnetized by magnetic force exerted on energizing the magnetic coil so that the moving core is formed in a given shape;
• plastically deforming magnetic material to be magnetized by magnetic force exerted on energizing the magnetic coil so that the fixed core is formed in a given shape;
• axially moving and inserting the moving core into an inside of the yoke from the opening of the yoke toward the bottom thereof so that the moving core is assembled to the yoke;
• forming a primary resin part having first and second flange portions on an outer circumference of the fixed core by integral resin molding;
• winding the magnetic coil on the primary resin part between the first and second flange portions;
• forming a secondary resin part over an outer circumference of the magnetic coil by integral resin molding so that a coil assembly, in which the magnetic coil and the primary and secondary resin parts are integrated with the fixed core, is completed;
• and
• axially moving and inserting the coil assembly into a space between an inner circumference of the yoke and an outer circumference of the moving core from the opening of the yoke toward the bottom thereof so that the coil assembly is assembled to the yoke.