Study on Controlling of Heating Rate by Using a Sample Holder for Low-Frequency Induction Heating

Abstract

　In order to reduce power consumption, there is a strong demand for low-loss motors. Annealing of iron core materials after machining is an effective way to achieve lower loss in motors, but the time and economic cost of annealing in electric furnaces or gas furnaces, which are commonly used today, is a very high. Therefore, a sample holder for low-frequency induction heating was devised to shorten the annealing time and control the heating rate. In this paper, a comparison of the heat cycle with and without the sample holder is performed by using hybrid finite element analysis and measurement on actual specimens, and the results show that the sample holder is effective in improving the heating rate.