Research On Speed Sensor And Property Measurement Method Of Magnetoelectric Composite

The magnetoelectric material is a kind of new functional material with magnetoelectric effect or inverse magnetoelectric effect.The magnetoelectric composite material has attracted wide attention and research because of its good magnetoelectric properties at room temperature.The layered magnetoelectric composite is the most promising research hotspot because of its simple composite method and good magnetoelectric properties.Most of the previous studies on magnetoelectric materials focus on how to improve the magnetic properties,magnetic materials for the device design research is relatively small.In this paper,the study of magnetoelectric properties,focusing on the development of magnetoelectric materials designed into the device,and to study its actual working conditions.In addition,based on the existing magnetic performance test system is relatively large,it is difficult to miniaturization of the development of the status quo,the design of a small test device.In this paper,Ni/PZT,Metal-glass/PZT magnetic composite materials were prepared by using Ni and amorphous as magnetostrictive materials,lead zirconate titanate(PZT)as piezoelectric material and 502 as binder.A set of sensor test platforms for testing the performance of magnetized samples prepared as speed sensors.In addition,compared with the traditional coil sensor,the magnetic sample speed sensor and coil sensor at different speeds,especially at low speed under the work of the situation.In this paper,we invent a measuring device of micro-dynamic magnetic effect of shielding coil,the main content is to change the previous electromagnetic shielding method,by shielding the electromagnetic coil,the effective shielding of the electromagnetic field generated by the electromagnetic field.It is also possible to increase the sample space from the shielded sample to the shielded coil.The device only need to shield the coil,test different samples do not need to be replaced every time,to simplify the operation of the purpose,it is not easy to damage the sample,is conducive to maintaining the stability of the overall test system.The design provides a miniaturization,easy to embed the low temperature system of the dynamic method of magnetic effect test device.we designed a dynamic method to measure magnetoelectric effect by shielding coil according to Faraday's law of induction.Through the design of single flat coil and shielding coil,the micro test device can shield of the electric field effectively and expand the space of test sample.The actual test results shown that the test method can be very compatible with the PPMS system,as PPMS expansion function,we believe it will become a common method of magnetoelectric performance mesurement.