Study On Tubeless Cooling Of Rare Earth Giant Magnetostrictive Actuator

Rare earth giant magnetostrictive actuator(GMA)is a micro-displacement output device which uses magnetostrictive effect to work.Because of its large expansion and strong reliability,it has been widely used in energy conversion,drive and other engineering fields,but the problem of GMA heating has always been a difficult problem in the industry.By analyzing the hysteresis loss,eddy current effect and resistance loss of coils produced by GMA,this paper explains the causes of heating.It also introduces the thermal expansion compensation,flexible support mechanism compensation,software control method,forced cooling temperature control,temperature control using phase change materials or semiconductor materials and other temperature control methods adopted by GMA at this stage,and compares each temperature control method in detail.Advantages and disadvantages of control measures and their application occasions.Through the comparison of various schemes,it is concluded that the research of GMA temperature control at this stage is mainly solved by restraining heat diffusion and exporting heat.In this paper,through the analysis of the widely used forced water cooling scheme,a tube-less cooling method is proposed to cool the heat source in GMA.Various factors affecting cooling efficiency in tubeless cooling system are studied and analyzed by means of analysis model,innovative scheme,ANSYS simulation experiment and data orthogonal experiment.During the whole research process,it was found that there were a lot of invalid spaces in GMA.Most of the cooling systems contacted with heat sources belonged to point-tosurface or point-to-point contacts,which directly led to the reduction of cooling efficiency by using forced water cooling method.Therefore,a tube-less cooling method was designed to increase the contact area between coolant and heat sources,so as to increase the cooling efficiency.Get promoted.In the process of research,non-conductive pure water was used to cool the cooling system to prevent conductive hazards.In the process of modeling,the uniform distribution of coolant in the system was optimized.Using ANSYS simulation software,the velocity and pressure of coolant and the size of coolant inlet and outlet in cooling system are studied in detail.It is concluded that when the coolant velocity is 1.2m/s,the cooling efficiency is reasonable and the energy consumption is the lowest.When the diameter of coolant inlet and outlet is 10 mm,the GMM rod is at the optimum working temperature,at which time the GMA working efficiency is the highest and the output is the lowest.The displacement is the largest,and the pressure in the cooling system has little effect on the temperature in GMA.Through SPSS software,orthogonal experiments and two-way interaction experiments were carried out on the obtained simulation data.The results show that the change of flow rate and the size of the entrance and exit has a greater impact on the internal temperature of GMA,while the cooling hydraulic pressure has a smaller impact on the internal temperature of GMA.The conclusion of the simulation experiment is verified.Through two-to-two interaction experiments,it is concluded that the cooling efficiency is the best when the flow rate is 1.2m/s,the pressure is 1000 Pa and the diameter of the inlet is 10 mm.Finally,the sealing problem in the whole cooling system is discussed.The sealing gasket is used to seal the shell and the cork plug is used to seal the coil outlet to ensure the good sealing of the whole device.The research has formed a relatively complete set of innovative schemes to study GMA temperature control measures.The research provides theoretical data support for engineering practice,and further explores the temperature control research of the actuator.This topic has reference significance for the temperature control research of rare earth giant magnetostrictive actuator.