An RSST for 2-D Magnetic Testing of Electrical Steel Under Controlled Temperatures

Electrical machines and transformers use iron cores that operate in high-temperature environments, impacting their magnetic properties and performance. This research presents the development of a cross-shaped rotational single-sheet tester (RSST) designed to measure the magnetic properties of electrical steel sheets under controlled temperatures and 2-D supply conditions. To ensure uniform heating and prevent specimen deformation, two heating sheets connected to a controller are positioned on either side of the specimen. A vector H-coil featuring a ceramic frame has been engineered to minimize the impact of thermal expansion on the cross-sectional area, enhancing the accuracy of measurements. Furthermore, integrated B and H sensors were proposed to shorten the leads of the B- and H-coils and reduce the environmental noise. 1-D and 2-D measurements were successfully performed on non-oriented and grain-oriented specimens from room temperature to 200 °C.