Thermal Analysis And Temperature Control Device Research Of Giant Magnetostrictive Material Smart Component

Giant magnetostrictive material smart component is a new type of electric-magnetic-mechanical energy conversion device based on Giant Magnetostrictive Material (GMM), which is widely used in, sonar transducer, active vibration control, ultra-precision machining and other occasions in micro drive area because of its high positioning accuracy, high frequency response, large output displacement and other characteristics.However, when GMM smart component is working, the coils generate a great deal of joule heat. At the same time, eddy current loss and magnetic hysteresis loss is generated on GMM under the action of alternating magnetic field. If the heat is not dissipated in time, the temperature of GMM will rise, which leads to thermal expansion and unstablility of magnetostriction coefficient, which will ultimately affect the output precision of the smart components.To solve the problems above, a literature research is given first, which contains a review of characteristics and application status of giant magnetostrictive material and a summary of temperature control methods for smart component. Then the thermal properties and temperature control requirements of a certain smart component are analyzed. Calculating methods of different heat source are put forward. Three kinds of temperature control devices with different cooling structures—annular structure, spiral structure and structure with baffle rings—are designed. The finite element model for temperature field simulation of the smart component is built. After the machining and assembly of the three temperature control devices, a platform for temperature control experiment is built. With different cooling structures and strategies, several groups of experiments are conducted. The experimental results show that heat convection is strengthened and temperature control accuracy is improved when cooling structure with baffle rings is used. The experimental results also prove that the temperature control device designed with phase-change material and cooling structure with baffle rings meets the design requirements.