Magnetic Energy Losses and Temperature Control System for Giant Magnetostrictive Transducer

Abstract

The giant magnetostrictive transducer (GMT) can be widely used in ultra-precision machining in precision-fluid-control fields. The temperature stability of GMT is critical for the reliable generation of output characteristics. This study presents a magnetic-energy-losses method for the GMT working at high frequency, and designs a temperature-stable control system to improve energy transmission and heat dissipation. Based on the loss-separation theory and experimental data, the temperature-rise characteristics of the transducer are analyzed. The temperature rise considers the effects of hysteresis loss, the eddy-current loss, the anomalous loss and the Joule heat. A constitutive relation among losses, frequency and magnetic-flux density is given. The temperature distribution of the transducer can be quickly and accurately calculated, using the constitutive equation. According to the convective heat-transfer and the thermal-compensation method, a temperature-control system is designed. A prototype of the system is then fabricated and tested to verify the feasibility and efficacy of the proposed design methods. The results demonstrate that the output- displacement deviation can be controlled at less than 0.65 μm, and the temperature difference is less than 3 °C.

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“…Magnetic spinel nanoparticles as polar materials can enhance the efficiency of MW heating, and enhance heat through hysteresis losses activated in magnetic fields released from MWA ( Fig. 3 A) [ 57 , 58 ]. The spinel MgFe 2 O 4 NP, which is soft magnetic mental oxide, can absorb microwave due to its narrow energy band gap, great magnetic heating capability, and lower thermal conductivity, resulting in low heat loss during heating [ 59 ].…”

Dynamic Characteristic Model of Giant Magnetostrictive Transducer with Double Terfenol-D Rods

“…The magnetic circuit is closed through magnetic yoke. The structure parameters of the giant magnetostrictive transducer are presented in Table 2 [ 21 ].…”

“…The prediction accuracy of the magnetic energy losses is critical for the reliable generation of output characteristics. The hysteresis loss and eddy current loss have been studied [ 21 ]. Moreover, a cooling system must match the overall heat generated during operation.…”