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A b s t r n c f -AC electromagnets are widely used for electromagnetic devices.It is necessary to predict the dynamic behavior for the optimum design of AC electromagnets.The 3-D analysis method has been used to obtain the operating characteristics of an AC electromagnetic contactor.The electromagnet of the contactor has a complex load curve relating to the position of the armature.The time variations of the exciting current and the stroke of the electromagnet under the load are calculated by our method.It is clarified that the operating characteristics of the electromagnetic contactor can be accurately calculated by comparing it with the measurements.

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A new approximate method is developed for calculating three-dimensional magnetic fields in magnetic circuits composed of connected axisymmetric and rectangular regions. Using this new method, fairly accurate solutions can be obtained when the leakage flux from the magnetic circuit is small.In this paper, the new method is explained and then the usefulness of the technique is clarified by comparing calculated and measured flux densities.