BH Curve Tracing Method Based on Magnetic Contact Force

This paper proposes a novel method for tracing the BH curve of electrical steel based on magnetic contact force. Generally, the BH curve of electrical steel is measured using methods such as the Epstein frame or the vibrating sample magnetometer (VSM). However, these conventional methods have inherent limitations. The Epstein frame struggles with accurate measurements at high magnetic fields, while the VSM is costly and difficult to miniaturize. The proposed method addresses these challenges by precisely measuring the magnetic contact force between a sensor and a core to trace the magnetic flux density and field strength within the sample. By employing a DC magnetic field, this approach eliminates errors caused by harmonics. Additionally, the system utilizes a simple closed-loop magnetic circuit without air gaps, significantly enhancing measurement accuracy. This design enables the generation of high magnetic fields with minimal energy, allowing for a cost-effective and compact implementation that differentiates it from existing methods. To validate the proposed method, a simple electromagnet model was developed, and its performance was assessed by comparing numerical calculations with experimental measurements. The results demonstrate the effectiveness and feasibility of this innovative approach for BH curve measurement.