Measurement And Analysis Of Electromagnetic Characteristics Of Fe-Ga Alloy

Fe-Ga alloy has the advantages of low saturated magnetic field,high magnetostrictive ratio,good mechanical properties,strong environmental adaptability,economic applicability and so on.It is the preferred material for various magnetostrictive devices such as new actuators,sensors,micro-motors and so on.The measurement and analysis of the electromagnetic characteristics of Fe-Ga alloy have important reference significance for the research and application of Fe-Ga alloy.In this paper,the electromagnetic characteristics of Fe-Ga alloy are measured and analyzed.The output characteristics of the transducer are measured and analyzed.Based on the impedance analyzer and the self-designed magnetostrictive material multi-field coupling characteristic measurement system,the compliance coefficient S₃₃ and magneto-mechanical coupling coefficient K₃₃ of Fe-Ga alloy are determined by measuring the impedance frequency characteristics of Fe-Ga alloy under different magnetic fields.The impedance frequency characteristics of rod and sheet samples under different magnetic fields were measured,the resonance and antiresonance frequencies were determined,the compliance coefficient S₃₃ and magnetomechanical coupling coefficient K₃₃ were calculated,and the characteristic parameters of sheet and rod samples were compared and analyzed.The hysteresis characteristics of Fe-Ga alloy were measured and analyzed.The magnetostrictive multi-field coupling measurement system is used to measure the hysteresis loops at quasi-static and dynamic frequencies.The variation characteristics of the hysteresis loops with the prestressing force are obtained by changing the prestressing force.The variation law of coercivity,remanence,initial permeability and maximum permeability with prestressing force under quasi-static state is determined by hysteresis loop.The variation characteristics of hysteresis loop,coercivity,remanence,dynamic permeability and energy produced by magnetization process with frequency and prestressing force under low frequency dynamic state are determined.The static output characteristics of the double-excitation coils Fe-Ga alloy transducer under different prestressing force are analyzed,and the established model is verified.Based on the finite element method,the dynamic output characteristics are calculated and compared with the experimental results.The dynamic output characteristics of transducer at different frequencies under different prestressing are measured and analyzed.The hysteresis loops at different frequencies are measured,the magnetic field values and magnetic induction intensity values at different frequencies are determined,and the hysteresis angles at different frequencies are obtained by using the curves.Finally,the relationship between frequency and mechanical energy output under different prestressing force is determined by using the principle of magnetic energy conservation and magnetic energy mechanical energy conversion.