A Vector Magnetic Measurement System for Electrical Steel Sheet Under Controlled Temperature and Stress

The iron cores of electrical equipment, which is laminated with electrical steel sheets, typically operate within specific temperature and stress ranges. However, conventional measurement methods often fail to account for the impact of these factors on magnetic properties. This article proposes a vector magnetic properties measurement system for electrical steel sheet featuring simultaneous loading of stress and temperature. The sample temperature is regulated by an aluminum heating plate positioned beneath the cross-shaped sample, within which the electric heating wires are deliberately arranged in an antiparallel manner to minimize any potential disturbances from the currents. Detailed specifications for mechanical stress application are also provided. The alternating magnetic properties of nonoriented (NO) steel are evaluated and compared with the results from the standard Epstein frame (EF) to verify the effectiveness of the developed system. Furthermore, both alternating and rotational magnetic properties under varying temperatures and stress are summarized and analyzed. The obtained magnetic-thermo-mechanical coupling data are essential for accurate modeling of the magnetic properties of electrical steel in operational conditions.