Abstract
The effect of variable compressive stress on hysteresis, eddy-current, and anomalous losses in magnetostrictive materials is investigated by the built magnetic characteristic testing system. Based on experimental results of Terfenol-D and loss separation theory, the trends of loss coefficients of three variables, magnetic frequency f, peak flux magnetic density Bm, and compressive stress σ, are analyzed. The reasons for the change in losses are explained from the point of view of micro-magnetism and physical mechanism. A variable coefficient magnetic energy loss calculating model considering compressive stress is derived using the algorithm of Levenberg–Marquardt and the method of multivariate parametric regression. The experimental and computed results of magnetic energy losses are compared and analyzed under different operating conditions. The analysis results show that the proposed model could well predict the losses under compressive stress at high-frequencies (5–20 kHz). The average error of the computed and experimental results is 5.5%. This research has improving significance in giving theoretical guidance for magneto-mechanical design in the high-frequency operated conditions of magnetostrictive devices.
Highlights
Rare-earth-iron Terfenol-D (TbxDy1−xFe1.9−2.0, 0.27 ≤ x ≤ 0.3) alloys have attracted considerable attention as important ferromagnetic materials owing to giant magnetostriction and high energy density
In Refs. 10 and 11, based on the high-frequency dynamic hysteresis loop and loss testing data of Terfenol-D, an improved variable scitation.org/journal/adv coefficient magnetic energy loss model was proposed and the variation trend of loss coefficients changing with magnetic frequency and peak magnetic density was explored
A variable coefficient magnetic energy loss model considering the compressive stress is established by extracting parameters from experimental tests
Summary
Rare-earth-iron Terfenol-D (TbxDy1−xFe1.9−2.0, 0.27 ≤ x ≤ 0.3) alloys have attracted considerable attention as important ferromagnetic materials owing to giant magnetostriction and high energy density They have been widely applied in various scenarios, such as magnetostrictive sensors, ultrasonic devices, and sonar transducers.. Based on the Bertotti loss separation theory, a kind of loss calculating model for giant magnetostrictive materials considering variable compressive stress is established. In this model, the loss coefficients are modified by introducing compressive stress-related terms. Losses of the additional magnetic frequency term and peak magnetic density term are introduced to realize accurate calculation for considering the influence of dynamic magnetic characteristics and skin effect This proposed loss model has well correctness by comparing computed results and the experimental data
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