VP10-04: A 2-D Magnetic Measuring System under the Co-loading of Temperature and Stress

Temperature and stress are two influence factors of the magnetic properties of silicon steel, which means they affect the performance of electrical devices that use silicon steel sheets as cores. Accurate measurement and simulation of magnetic properties such as hysteresis and loss of magnetic materials under multiple working conditions are essential to their application in the design and improvement of new electromagnetic equipment. There are few devices that could measure the rotational magnetic properties under simultaneous loading of temperature and stress at present [1]. In order to obtain the magnetic properties of silicon steel sheets under a specific working condition, a 2-D magnetic measuring system that could apply temperature and stress at the same time is developed in this paper. The silicon steel sample is cut into a cross shape to fit the excitation structure consists of two orthogonal double-C yokes. An aluminum alloy plate with heating wires is used to locally heat the middle area of the sample. The uniformity and gradient changes of temperature loading were analyzed through simulation and experiment. Two stepper electrical cylinders are connected to the legs of the sample through stabilizers to apply stress. The magnetic flux density B and magnetic field intensity H in the middle area of the sample are measured by a combined B-H sensor which is able to withstand high temperatures above 200°C. The magnetic properties under different temperature and under different uniaxial stress of non-oriented silicon steels B25AV1300 are measured, which is under alternating magnetization. The hysteresis loop of magnetization along the rolling direction at different temperatures at a frequency of 400Hz and a magnetic flux density of 1T is shown in Fig. 1. Fig. 2 shows the power loss when different tensile and compress stress are applied along the rolling direction at different temperatures， at a frequency of 200Hz and a magnetic flux density of 1T. Results of rotational magnetic measurement will be presented in the full manuscript.References: [1] D. Zhang, K. Shi, Z. Ren, et al. Measurement of Stress and Temperature Dependent Vector Magnetic Properties of Electrical Steel Sheet, IEEE Transactions on Industrial Electronics, vol. 69, no. 1, pp. 980-990 (2022)