Effects of the Step-Lap Joints Configurations on the No-Load Losses of the Transformer

This paper investigates the core losses associated with different configurations of lap joints. Several step-lap arrangements are discussed in this study, with a focus on no-load losses. The main purpose of this study is to improve the lap joint design of the core of the transformer. The finite element analysis technique is used to analyze the no-load losses of the core with different step-lap joint configurations. Finite element results illustrate that the spread lap joints can provide lower no-load losses. However, the manufacturing cost and time are higher in these types of step-lap joint configurations. On the other hand, the two or three gaps together are easy to manufacture and the overall cost is also lower than a spread lap sheet due to the manufacturing and labor costs.