Magnetic Energy Losses and Temperature Control System for Giant Magnetostrictive Transducer

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 mu m, and the temperature difference is less than 3 degrees C.

Automated summary

The giant magnetostrictive transducer (GMT) has a wide range of applications in precision-fluid-control fields in ultra-precision machining. This study introduces a magnetic-energy-losses method for high frequency GMT, and designs a temperature-stable control system for improved energy transmission and heat dissipation. The study also presents an analysis of the temperature rise characteristics of the transducer based on loss-separation theory and experimental data.