Patent ID: 6597268
Filing Date: 2003-07-22
Classification: B06B,G08B,H02K

Abstract:
An electromagnetic device comprising:a coil bobbin supporting an excitation coil; a U-shaped iron piece constructed of a soft magnetic material, having one side being inserted through and fixed to said coil bobbin in a direction of an axis of said excitation coil and having a remaining side being bent from said one side to oppose to said one side and to have a resilient force acting so as to move away from said one side, and a pair of iron cores being inserted through and fixed to said coil bobbin so as to overlap on said one side of said U-shaped iron piece to add a magnetomotive force of said U-shaped iron piece to a magnetomotive force of said iron cores, one of said iron cores having a first rising section formed by bending one end portion thereof toward said remaining side of said U-shaped iron piece so that a flux linkage is increased, the other of said iron cores having a second rising section adjacent to said first rising section and formed by bending one end portion of the other of said iron cores toward said remaining side of said U-shaped iron piece so that said flux linkage is increased, said remaining side of said U-shaped iron piece being opposite to said first and second rising sections at a predetermined distance away, and said remaining side and the bent portion of said U-shaped iron piece being held movably against said resilient force of said remaining side of said U-shaped iron piece by a magnetomotive force of said excitation coil.