Study On High Frequency Loss And Temperature-Rise In Giant Magnetostrictive Transducer

Giant magnetostrictive transducer is a device which can converse different kinds of energies,and the core component of the transducer is the giant magnetostrictive material Terfenol-D rod.Giant magnetostrictive transducer has many advantages such as large strain displacement,fast response,high energy conversion efficiency and large output power.It has been widely used in industry,precision control,military engineering and other engineering fields.When the giant magnetostrictive transducer works in the condition of high-frequency magnetic field,there are many types of serious loss and large heat release.It makes the efficiency reduce and even not work normally.This research has great theoretical guidance and scientific value for optimizing the structure of transducers and improving working efficiency.Firstly,the structure of the giant magnetostrictive transducer was introduced in this paper.The structure parameters of the giant magnetostrictive transducer were calculated by the general composite oscillator model.The relationship between the static magnetostriction and prestress of the giant magnetostrictive material Terfenol-D under different prestress was tested experimentally.The coil parameters of the giant magnetostrictive transducer were determined.Secondly,the hysteresis loss and coil loss were analyzed in theory.The internal magnetic field distribution of the giant magnetostrictive rod in stack structure under the time-harmonic excitation magnetic field was calculated based on the Maxwell equation.The dynamic eddy current loss model of magnetostrictive rod in stack structure was built,and the accuracy of this model was validated by finite element simulation.The magnetic induction intensity of the model was corrected by error analysis,and the characteristics of the transducer eddy current loss were analyzed.It provides a theoretical basis for the practical application of the giant magnetostrictive transducer.At last,the temperature distribution of the giant magnetostrictive transducer with different cooling medium was obtained by analyzing the energy dissipation of the transducer.The temperature rise of the transducer indicates that the working temperature of the stack structure GMM transducer is lower and it is more conducive to the stable operation under the high frequency.The research results provide a theoretical support for the design of radiator of the magnetostrictive transducer.