Experimental characterization of slinky-laminated core and iron loss analysis of electric machine

Abstract

The manufacturing of the magnetic parts of electrical machines requires several industrial processes. These may have effects on the magnetic properties of the material, especially in terms of iron losses [1]-[3]. With the development of the manufacturing technique and production machines, the slinky lamination method is now being used to significantly reduce the material waste [4]. For this process, a long iron band is rolled up in a spiral way and is bonded [1]. Thus, stresses (compressive and tensile) and strain occur simultaneously in the core. As a result, the magnetic properties are deteriorated, and it is hard to estimate the deteriorated properties of the slinky-laminated material. There have been several studies on the influence of stress on the magnetic properties [5]-[7]. In these studies, the deteriorated magnetic properties caused by shrink fitting were investigated. Only the impact of the compressive stress was examined, however, and this was done through a test using laminated specimens. This cannot be considered suitable for accurately analyzing the iron loss of the slinky-laminated core in electrical machines.