As a signal source device, micro-transformer is widely used in various power metering devices. In these working situations, the performance of micro-transformer directly affects the accuracy of measurement.
At present, the three kinds of iron core materials commonly used in micro-current transformers are silicon steel, ultra-microcrystalline and slope mo alloys, and the properties of iron core materials directly affect the transfer characteristics of transformers. In other words, for this type of product, the material used in the iron core components will directly determine the precision of the production. At present, three kinds of iron core materials commonly used are silicon steel core, ultra-microcrystalline iron core, slope mo alloy iron core. Comparatively speaking, the miniature transformer made of slope mo alloy Iron core material has more advantages in performance.
Its transmission characteristics are measured by the angular difference F and the ratio difference delta. According to the relevant data, the error of micro-transformer is mainly generated by the excitation current provided by flux, and the main determining factor of excitation current is the performance of iron core material. First of all, we understand the properties of silicon steel core materials, silicon steel core material saturation magnetic density bs/t in about 2.1T, rectangle is lower than br/bs, the initial magnetic conductivity μi around 1K, the maximum magnetic conductivity μm around 40K.
Silicon steel core materials low price, accuracy is generally not more than 0.5 levels , precision is difficult to achieve. The saturated magnetic density of bs/t core material is around 1.23T, the rectangle is higher than the Br/bs low, the initial magnetic conductivity μi is around 3M, the maximum magnetic conductivity μm is around 4M, the playing force HC is 064a/m, the price of ultra-microcrystalline iron core material is more expensive than silicon steel, suitable for micro-transformer,
Accuracy can reach 0.2 levels. Usually, the saturated magnetic density of the bs/t alloy iron core material is around 1.6T, the rectangle is lower than the br/bs, the initial magnetic conductivity is μi at about 3M, the maximum magnetic conductivity is μm around 4M, the playing force HC is 064a/m, and the density D is 8.25g/cm3. The price of slope mo alloy Iron core material is more expensive than ultra-microcrystalline, suitable for micro-transformer, the accuracy can reach 0.1 levels.