The transient magnetization process and operations in the plunger type electromagnet

D.C. electromagnets are generally used in electric devices such as an electromagnetic switch, an electro-magnetic relay, an electromagnetic value, etc.. The transient magnetization affects the determination of the electromagnetic force and the performance characteristic. However, there are few reports on the details of the transient phenomena in an electromagnet. The purpose of this paper is to describe two phenomena which are obtained from the numerical analyses and some experiments. One is the time lag of magnetic flux due to the skin effect. The other is the transient magnetization process near the gap in the plunger type electromagnet made of solid core.