1、Ultra magnetostriction execution and its control partapplication in fluid Dietmar Reinert, Emmanuelle Bruna and Eva Flasplera aBG-Institute for Occupational Safety and Health (BGIA), Alte Heerstrae 111, D-53757 Sankt Augustin, Germany Abstract：The ultra magnetostriction material is one kind of newfu
2、nction material， in the consult massive literature foundatio，introduced the ultra magnetostriction execution principle andclassified and its in the fluid control part applied research presentsituation， and has carried on the forecast to the ultramagnetostriction execution in the fluid machinery appl
3、icationprospect.Key word： Ultra magnetostriction Execution Fluid control part 0. IntroductionThe hydraulic servo performance mainly is decided to composes thissystem the valve, pumps with fluid and so on oil motor controls thepart the performance. Therefore enhances the fluid to control the partthe
4、performance always is peoples diligently goal. The traditionalfluid control part mainly uses the electric motor, the electro-magnetachievement actuates the part. In recent years, along with some newfunction materials appearances, made large scale to enhance the fluidto control the part the performan
5、ce possibly to become. The ultramagnetostriction material is one kind of new electricity (magnetism) -the mechanical energy transformation material, has under the roomtemperature should the variable lamda big, energy density high, thespeed of response is quick and so on the characteristic, overseas
6、byapplies it to the servo valve, the proportion valve and miniaturepumps and so on in the fluid control part, and has made some progress.This article makes an introduction on this aspect situation.1. Ultra magnetostriction execution 1.1 ultra magnetostriction materials 1 2 The ultra magnetostriction
7、 material (Giant Magnetostrictive Material)does not have to the traditional magnetostriction material (Fe, Co, Niand so on), is Dr. Clark which refers to the American water surfaceweapon center to the beginning of the 70s first discovers in roomtemperature and under the low magnetic field has the ve
8、ry bigmagnetostriction coefficient three Yuan thin crude iron compound, thetypical material is TbxDy1-xFe2-y. The in the formula x expressedratio of the Tb/Dy, y represents ratio of the R/Fe, x generally is0.27 0.35, y is 0.1 0.05. This kind of three Yuan rare earth alloymaterial has realized the co
9、mmercialized production, the typicalcommodity trademark is Terfenol-D (USS Edge Technologies Corporation)or Magmek86 (Swedens Feredyn AB Corporation), represents theingredient is Tb0.27Dy0.73Fe1.93.With the piezoelectricity material (PZT) and traditionalmagnetostriction material Ni, Co and so on com
10、pare, the ultramagnetostriction material has the unique performance: Is very bigunder the room temperature strain value (1,500 2000ppm), is nickel40 50 times, is piezoelectricity ceramics 5 8 times; The energydensity is high (14,000 25000J/m), is nickel 400 500 times, ispiezoelectricity ceramics 10
11、14 times; The mechanical and electricalcoupling coefficient is big; The speed of response is quick (achievesmu the s level); The output strength is big, may reach 220 880N. Because ultra magnetostriction material above fine performance, thusis in particular good in many domains in the execution cent
12、erapplication prospect.1.2 ultra magnetostriction executionsThe ultra magnetostriction execution structure simple, moves big, theoutput strength strong, is easy to realize the microminiaturization,and may use the wireless control. The ultra magnetostriction executionmay divide into following three k
13、ind of types according to thestructure:1.2.1 direct drives 3 This kind of ultra magnetostriction execution mainly uses the clavateultra magnetostriction alloy direct drive execution component, doesnot use the enlargement organization, its general structure like chart1 shows. Because the ultra magnet
14、ostriction material compressivestrength is bigger than its tensile strength by far, therefore usesthe precompression spring to cause it to work under the certainpressure. In the chart about two permanent magnets use for to providethe certain leaning magnetic field, causes the ultra magnetostrictions
15、tick to work in the appropriate linear scope. This kind of ultramagnetostriction execution structure relatively simple, moves, theoutput strength in a big way is strong, mainly is applied in the watersound transducer, the new motor, the micro displacement controller andthe fluid valve.1.2.2 displace
16、ments (strength) enlargement 2The displacement (strength) the enlargement ultra magnetostrictionexecution may divide into the release lever according to the principleto enlarge the type and the hydraulic pressure enlargement type twokinds. The release lever enlarges the type ultra magnetostrictionexecution mainly to use the release lever organization to obtain abigger displacement or the strength output, but also
