Technical_Information-brush_wear

《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