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1、940IEEETRANSACTIONSONMAGNETICS,VOL.37,NO.2,MARCH2001LifetimePredictionMethodforPiggybackPZTActuatorShigeoNakamura,IrizoNaniwa,KazutakaSato,KeiYasuna,andShozoSaegusaAbstract—TheexperimentallifetimepredictiveequationforapiggybackPZTactuatorwasderived.Apiggybackactuatorisafineactua
2、torofadual-stageservosystemthatisessentialtoincreasetherecordingdensityofharddiskdrives(HDD’s).TheobtainedequationagreeswithArrhenius’equation.Thelifetimeofourdevelopedactuatorwasestimatedtobelongerthan5yearsunderheavyuseconditions.Thislifetimepredictionmethodisusefulfordesignin
3、gpiggybackPZTactuatorsforhigh-performanceHDD’s.IndexTerms—Dual-stageservosystem,harddiskdrive,headpo-sitioningsystem,lifetimeprediction,PZTactuator.I.INTRODUCTIONFig.1.Schematicviewofaharddiskdrive.ARDDISKdrives(HDD’s)arethemostusefulex-Hternalstoragedevicesforcomputersystemsand
4、homeinformationequipment.Fig.1showsthemajormechatronicslider-typeactuatorthatislocatedbetweenthesuspensionandcomponentsofaconventionalHDD.Digitalinformationtheslider[3],[4].Theadvantageofthisactuatorisco-locationisrecordedinconcentrictracksofthedisksbymeansofoftheactuatorandsens
5、or,whichmakespossibleaservominiaturizedread/write(R/W)heads.R/Wheadsaremountedbandwidthof5kHzormore[8].However,thetotalthicknessofonself-lubricatedsub-micronflyingsliders.Theseslidersthesuspensionandactuatorislarge,anditsassemblyprocessareconnectedtostainless-steelsuspensionstha
6、tareinturnisalittlebitcomplicated.ThethirdtypeofpiggybackactuatorconnectedtoanE-blockandavoicecoilmotor(VCM).ThisisplacedbetweenasliderandaR/WheadtodrivetheR/Wsetupallowsforcross-trackseekandtrack-followingoperationhead[5].Intheory,alargeservobandwidthcanbeachievedoftheR/Wheads.
7、ifthefineactuatorislocatedclosertoheadelement,howeverApiggybackactuatorisafineactuatorofadual-stageitisdifficulttofabricatethisactuatorinthepresentindustrialservosystemforanHDD.TherecordingdensityofHDD’sinfrastructure.hasbeenincreasingby60to100%peryear.Thedual-stageTheyareveryus
8、efultoexpandservobandwidthofHDD’s,servosystemex
