抄録
AC electromagnets are widely used for the operating magnets of magnetic contactors, relays and other electromagnetic devices. It is necessary for the optimum design of a new generation of AC electromagnetic devices to obtain the dynamic behavior of the electromagnets. It is very difficult to obtain the dynamic behavior by the 3-D nonlinear analysis, because the displacement of the armature and the applied voltage vary with time. Recently, the 3-D analysis method in which the 3-D electromagnetic field is coupled to the electric circuit and the mechanical system has been developed by the authors. In this paper, the method has been advanced and applied to analyze a clapper type AC electromagnet with a shading coil. The time variations of the exciting current, the attractive force and the displacement of the armature are calculated, and the results calculated are compared with the measurements. Then, it is clarified that the operating characteristics of the AC electromagnet can be accurately calculated.
