用三角波电流励磁改进交流磁滞回线实验

Improving AC Hysteresis Loop Experiment Using Triangular Current Magnetic-exciting

改进了交流磁滞回线实验的励磁方法。研制了三角波电流交流恒流源驱动励磁线圈励磁,使软磁环形样品被交流磁化双向交替达到饱和,磁化场H的波形仍为三角波。维持三角波电流的周期和幅值不变,可使H变化的波形和变化的速率不变,可在H匀速变化的条件下观测样品的交流磁滞回线;能在磁化场相同的条件下观测不同样品的交流磁滞回线;还可直接观测样品的微分磁导率曲线。

It ameliorated magnetizing method for AC hysteresis loop experiment, h researched AC con- stant current circuit of triangular wave is used to drive the magnetic-exciting coil. Even when the sam ple is AC magnetized to saturation,magnetizing field H waveform is still triangular wave. If makes the triangular wave current period and amplitude unchanged, the H changing rate shall be unchanged. In which case, the change regulation of the magnetic induction intensity in the sample can be observed un- der the H uniform change condition. AC hysteresis loop of different samples can he observed under the same magnetizing field conditions. The differential permeability curve can also be directly displayed.