Measurement of Stress and Temperature Dependent Vector Magnetic Properties of Electrical Steel Sheet

Abstract

In addition to the excitation condition, the magnetic properties of electrical steel sheet (ESS) also depend on stress and temperature. This article proposes one systematic measurement method of measuring the vector magnetic properties (VMPs) of ESS. In the proposed method, the coupling effect of temperature and stress are considered. The uniform magnetic field distribution is generated in the measurement area of the specimen using a vertical-type orthogonal double-U shaped yoke. Since the specimen is cross shaped, the mechanical stress can be applied conveniently. The B-probe method and the double compound H-coil method are adopted to measure vector magnetic flux density ( <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">B</i> ) and magnetic field intensity ( <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">H</i> ). Moreover, the vector B-H sensor is assembled into a ceramic frame from within, which can withstand high temperature. A linear actuator can apply tensile or compressive stress along the rolling direction and transverse direction of the specimen. The variable temperature measurement conditions are achieved by a temperature controller and ceramic heating sheets. The stress and temperature dependent VMPs of nongrain oriented ESS and grain-oriented ESS are measured to verify the effectiveness of the proposed measurement method. The change regulation of VMPs with temperature and stress is summarized.