A COMPREHENSIVE ANALYSIS OF RADIAL THERMAL CONDUCTIVITY OF GRAIN-ORIENTED ELECTRICAL STEEL BASED ON THE INTERACTIVE APPROACH

The grain-oriented (GO) electrical steel coil has highly anisotropic conduction properties. These properties arise because, in one direction, thermal conductivity is that of the bulk conduction properties of electrical steel. In another direction, the conductivity is a fraction of bulk properties due to the thousands of laminations comprising a coil. There are two principal directions in which heat can be transferred in a coil, axially and radially. The temperature profile of a coil is determined by the proportion of total heat transferred in each direction. An electrical steel coil usually consists of thousands of laps, and each lap is a composite of steel and MgO coating on both surfaces. The heat entering the coil normal to the strip plane, i.e., radially, passes through coating, steel and the gas occupying the inter-lap gaps, and therefore, a high thermal resistance is associated with radial heat transfer. The conductivity of such a composite will be dependent upon the number of laminations and the thickness of individual layers. A series of experiments were conducted to measure the coil conduction in the radial direction to provide data for future research. Received: March 26, 2024Accepted: April 22, 2024