Examination of Effect of Stress-relief Annealing of Motor Core Materials using Induced Magnetic Field

Abstract

　The authors have been proposed a new strain annealing method by using induced magnetic field with aim of developing a simple and short-time strain annealing technique for motor cores. In this paper, the stress relief annealing effect in the induced magnetic field heating method is examined in detail. At first, the magnetic properties of ring cores, heated with an electric furnace and the induced magnetic field heating method are compared. Next, the effects on difference of the heating conditions are examined.