Abstract
Giant magnetostrictive transducer with micro and nano precision has a wide application prospect in the field of remote sensing. However, excessive heat loss of components could generate during the energy conversion and transfer from electric energy to magnetic energy, and magnetic energy to mechanical energy, thereby affecting its long-term service and also reducing energy utilization. In this paper, a new magnetostrictive transducer is proposed and its excitation coil, internal and external magnetic circuit are optimized from the perspective of reducing heat loss. With the help of theoretical and finite element analysis, the response law between key parameters and heat loss of key components are summarized, which provides a basis for reducing heat loss. Finally, according to the optimization scheme, the prototype is processed, and the temperature rise and dynamic output performance of the transducer are tested by constructing an experimental setup. The results show that the transducer has a low temperature rise and good frequency response characteristics, which can provide support for long-time precise actuation on-orbit.
Highlights
As a kind of intelligent transducer with fast response capability which can achieve more than 1500 ppm magnetostriction [1], giant magnetostrictive transducer (GMT) has been widely used in the manufacture of ultra-precision hydraulic servo valve [2], precision tool positioning [3] and ultrasonic transducer [4] and vibration control [5], etc
There are still some questions and difficulties in the applications on-orbit, especially the heat loss which reduces energy utilization and brings burdens to the design of heat dissipation instrument. From another perspective, the heat loss occurs in each process during the energy conversion and transfer from electric energy to mechanical energy
It can be found from the scheme that the giant magnetostrictive material (GMM) rod is located in the center of the coil and is slightly shorter than the axial size of the excitation coil
Summary
As a kind of intelligent transducer with fast response capability which can achieve more than 1500 ppm magnetostriction [1], giant magnetostrictive transducer (GMT) has been widely used in the manufacture of ultra-precision hydraulic servo valve [2], precision tool positioning [3] and ultrasonic transducer [4] and vibration control [5], etc. There are still some questions and difficulties in the applications on-orbit, especially the heat loss which reduces energy utilization and brings burdens to the design of heat dissipation instrument. Other researchers put forward their own views on designing a GMT with different aims, such as low eddy current loss characteristics, temperature compensation design, the effect of core geometry on the performance, etc. Aiming at the design of a closed magnetic yoke, we consider the heat loss, and take the mass of the yokes into account. In this way, it could provide some basis for on-orbit applications in future.
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