传统的磁滞回线教学实验仪使用的变压器铁磁材料和线圈都已固定,不利于比较硬磁材料和软磁材料的磁性质,不利于学生深入理解磁滞现象与磁材料物性的关系.结合多层次实验教学规范,设计了"积木式"磁滞回线实验装置,可更换磁性材料,通过用 NI myDAQ采集次级线圈电压后,用数值积分获得磁感应强度,并使测量更准确、更直观,可加深学生对测量物理过程的理解.在教学上拓展到广义力(磁场强度)和广义位移(磁感应强度)概念,测量磁滞损耗(广义功)及其与磁场强度或磁感应强度之间的相位差关系.
Design and teaching practice of hysteresis loop experiment with building block setup and NI myDAQ
The traditional setup of hysteresis loop measurement for laboratory courses directly em-ployed a transformer,where the ferromagnetic material(silicon steel)and coils were fixed.It was not conducive for students to compare the magnetic properties between a hard and a soft magnetic materi-al.And it was inconvenient for students to learn the relation between the hysteresis and the properties of the magnetic material.Combining the multi-layer teaching norms,a building block hysteresis loop experimental setup was designed with the building blocks,where the magnetic material could be re-placed.The secondary coil voltage was collected with NI myDAQ,and the magnetic induction intensi-ty was obtained by numerical integration.It made the measurement principle of electromagnetic induc-tion more intuitive and more accurate,so as to deepen students'understanding of measuring physical processes.In teaching practice,it could be extended to the concepts of generalized force(magnetic field strength)and generalized displacement(magnetic induction strength),thus further obtained the hysteresis loss(generalized work),and the relationship with the phase difference between the mag-netic field strength or the magnetic induction strength.
NETL
NSTL
万方数据
