Thermal Analysis Of The GMA Based On FEA And Research On Its Temperature Controlling System

Giant Magnetostrictive Material(GMM)is a kind of new material with highly efficiency of conversion of magnetic energy to mechanical energy.As a strategic function material,GMM is considered to be helpful to improve the overall competitive power of national high science and technology in the 21 st century.With the advantages of large force,high resolution and quick response,etc,GMM has a wide and bright application prospect in the fields of ultra precision machining, microelectronics technology,biological engineering,optical fiber connection,and the manipulation and assembly of microparts,etc.Currently,Giant Magnetostrictive Actuator(GMA)based on Joule effect of GMM,becomes research focus in the field of precision actuation.Although many achievements have been made,research on GMA is at the experimental stage and many problems still exist,especially about the GMM thermal error,which greatly influenced its application.Aimed at the problem, research on the thermal analysis and its temperature controlling were carried out at the designing step in the dissertation in order to eliminate or control the bad impact by temperature increase,which can help the GMA be of better performance and higher precision.That can help to stimulate the application of GMA in precision and ultra precision fields.The development course,characteristic advantages and application of GMM and GMA were introduced.Current researches on controlling thermal deformation of GMA were compared. Based on it,the temperature controlling system was designed.The basic theories and steps of thermal analysis with ANSYS were presented. On the basis of it,the GMAs with non-temperature-controlling and single temperature controlling structures were analyzed thermally under the condition of large current and long time.The results showed that consistent temperature water-cooling method was effective to control the thermal error of GMA.However,it is not enough.Then a two water-cooling cavity structure of GMA was proposed.The thermal analysis was made under the same condition.And the results proved that two water-cooling cavity structure GMA is better.Optimization to the GMA with two water-cooling cavity was done.And the thermal analysis was also made,the results of which proved again that GMA with two water-cooling cavity have better performance.The experimental system for GMA was established.The conditions of thermal deformation experiment were determined.And the experiment was done.The results showed that the effects about thermal controlling of GMA with two water-cooling structure were satisfying.Finally,the whole content was concluded,and what can be done in the future was presented.