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.

Precision positioning and vibration isolation are two main challenges for the sensitive payloads, to realize high quality observation. It means that on the one hand the sensitive payload should keep pace with the changes of target location for achieving alignment; on the other hand, the micro-vibrations from space cabin equipment should be suppressed for avoiding image jitter. A six-degree-of-freedom platform with simultaneous positioning and vibration suppression capabilities is proposed for replacing the original scheme with series connection of a positioning platform and a vibration isolation platform. The theoretical model of the platform with rigid payload is established and then is utilized as a constraint to conduct the passive vibration suppression optimization. Subsequently, a finite element model is constructed to verify the optimization results. Finally, experimental setups are built and tests are carried out to validate the performances. The test results demonstrate that the proposed platform possesses good simultaneous positioning and vibration suppression capabilities.

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