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在电表生产中,为了便于全面质量控制,需要知道某一块磁钢安装在电表中将产生多大的空气隙磁场。因此需将磁钢预先按在气隙中产生的磁场强度分类,这就需要标准磁钢,即在电表气隙中产生已知磁场强度的磁钢。本文介绍一种标定方法供同行参考。由磁电系仪表的工作原理可知: I=K(M/(SNB)) 经变化可得 B=(0.981M)/(SNI)式中,B——磁场强度。(T); M——扭转90°角时的游丝力矩(mg·cm); S——动圈有效面积(cm);
In the production of electric meters, in order to facilitate total quality control, you need to know how much air gap magnetic field will be generated when a piece of magnet is installed in an electric meter. Therefore, it is necessary to classify the magnet according to the intensity of the magnetic field generated in the air gap in advance. This requires a standard magnet, that is, a magnet that generates a known magnetic field strength in the air gap of the meter. This article describes a calibration method for peer reference. The work principle of the magnetoelectric instrument shows that I = K (M / (SNB)) can be obtained by the change B = (0.981M) / (SNI) where B is the magnetic field strength. (T); M - hairspring torque (mg · cm) when twisted by 90 °; S - active area of moving coil (cm);