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ID:40103319
大小:211.65 KB
页数:8页
时间:2019-07-21
《Technical_Information-brush_wear》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、SchunkKohlenstofftechnikTechnicalInformationNon-uniformbrushwearManycustomersask:„Whydobrushesonaspecificmachineshowanon-uniformbrushwear?“Fluctuationsinthebrushgradeareoftenheldresponsible.Belowwewouldliketoprovideyouasmallsuitcaseofarguments.Bymeansoftheseargu-mentsyoucanshow,thatalotofotherparam
2、etersmightberesponsiblefornon-uniformbrushwear1.Non-uniformout-of-roundnessfromonebrushtracktothenextNocommutator-surfaceisexactlyroundanditwillnotbecomebetterduringoperation.OncedamageditwillalsonothealbyitselfCommutators/slipringscanstayinastablestatebutbecomeworseovertheyearsifnotmaintainedprope
3、rlyAdmissiblevaluesoftheout-of-roundnessdependamongstothersontheperipheralspeed;what’sgoodat500rpmmustnotbegoodat3000rpm.Commutatorprofilesoflargemachinescanbemuchdifferentfromtheinnertotheoutertracks.Stabilityofthecommutator,vibrationsofthebrushholderstud,non-uniformcur-rentsharingetc.canbeaccount
4、ableforthat.2.Non-uniformbrushpressureThetoleranceofthepressureofapressurespringis±10%.Thiscanbeassigneddi-rectlytothebrushwear.Ithastobeconsideredthatspringsdon’tlastforever.Thepres-suredropsoffcontinuously,duetoafatigueeffectduringoperation.Aslargertheout-of-roundnessasmorethefatigue,duetotheperm
5、anentupanddownmovementofthebrushes.brushwear.doceIndex:1Page:1of:8SchunkKohlenstofftechnikTechnicalInformation3.Non-uniformtotaldownforceTheweightofacarbonbrushhasaninfluenceonthebrushwear,eventhoughitisrela-tivelylow.Thenetforceofbrushesin6o’clockand12o’clockpositioncanbedifferent.Thisnaturallybec
6、omesmoreofafactorwithheavymetalgraphitebrushes.4.Non-uniformcharacteristicsofthespringpressurewiththebrushwearThepressurecharacteristicsofapressurespringdependsonthespringtype.Thespiralspring,predominantlyusedintraction,hasgotaheavilydecliningcharacteristic,whereasthepressuregradientofextensionsspr
7、ingsandconstantcoilspringsisvirtuallinear.Withadjustablespringsitmustbeborneinmind,thatthepressuredifferentialbymeansofhandlingfailures.SpiralspringExtensionspringbrushwear.doceIndex:1Page:2of:8SchunkKohlen
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