Characteristic Of Losses And Temperature-rise In Giant Magnetostrictive Transducer

Giant magnetostrictive transducer is such a mechanical device that transformselectromagnetic energy into mechanical vibrations by using giant magnetostrictive material.Because of its compact structure, high energy density and high output power, goodreliability, it has a broad prospect in the biomedical and military industries and other fields.Therefore, the researching and optimizing the losses and temperature rise characteristics ofthe magnetostrictive transducer has great practical significance and scientific value.Due to the low resistivity, the coercivity force and remanence become large, whichbrings a lot of hysteresis loss and eddy current loss when the transducer works at the highfrequencies. These energy losses will be manifested in the form of heat, resulting intemperature rise of transducer. What’s more, giant magnetostrictive materials are sosensitive to temperature changes that the transducer could not work properly and theefficiency of the transducer is reduced.Firstly, the transducer eddy current loss, hysteresis loss and coil resistance loss areanalyzed mainly from two aspects in this paper using the theory of analytical calculationand finite element simulation to obtain more accurate energy losses. Then some measuresare proposed to reduce the energy losses in the giant magnetostrictive transducer. Secondly,the temperature rise characteristic is studied and analyzed based on the analysis of energylosses in giant magnetostrictive transducer. The characteristic of temperature are analyzedwith magnetic-thermal unidirectional coupling method and bidirectional coupling methodto get the temperature distribution of the transducer was. Finally, by analyzing andcomparing magnetic-thermal unidirectional coupling results, two-way coupling analysisresults and experimental results, the more accurate temperature distribution of thetransducer is obtained using the second method, making the transducer become closer to theactual working conditions.