Perfect Power Transmission for Fractional Horse Power Motors ...

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Perfect Power Transmission for Fractional Horse Power Motors ...

Best Materials for Power ToolsSchunk patent.Carbon brush withsignalling wire.With switch-offdevice and currenttransmissionwithin the smallestpossible space(a = 10 mm)Modern Carbon Brushes – IntegralComponents of the Motor SystemsCarbon brushes with a signalling wireand a switch-off device form one exampleof the innovative power of Schunk.Schunk was the first company to implementthis double function in one asingle carbon brush within the smallestpossible space.8 to10 operating hours prior to the endof the wearing stage the signallingwire issues the signal for exchange ofthe brush itself. This means that theprofessional tool user knows that histool will be in full working order foranother working day and he is thusable to plan the exchange of the brushaccordingly. On the part of the motormanufacturers this creates the possibilityof determining the service intervalswith the help of the carbon brush.When the wear and tear threshold levelis reached, an automatic switch-offdevice lifts the brush off the commutator,cuts off the flow of the currentand prevents commutator demage. Withthe help of new ideas and new developmentsin this field carbon brushesand associated systems can be increasinglyused as integral components ofthe motor system.Tailor-Made Materials for Useunder the Toughest ConditionsPossibleProfessional appliances and power toolsplace the highest demands on electricmotors. Schunk carbon brushesand systems have shown excellent performancein this field. In addition toresearch and development it is mainlythe right materials choice combinedwith the superior process technologyin our mixing plant in conjunction withour modern production technologywhich ensures the high quality of ourproducts.Schunk materials and modules forpower tools are tailor-made specificallyfor use under difficult conditionssuch as:High current densitiesVibrationDust formationHigh rotational speedsExposure to weather conditionsetc.In this context the expectations comprisea long operating life with thepossibility to refit new components aswell as a high operational reliability.Circular saw.Schunk carbonbrushes alsoguarantee a longoperating life athigh rotationalspeedsDrills and compactrotary hammers.Long service life ofthe carbon brushesas well as easyservicingare requiredOrbital sander withSchunk carbonbrushes. Low radiointerferences levelsalso during functionalvibrationsPermanent vibrationsand adverseenvironmentalconditions. Hedgeclippers requirethe best-possiblecommutationSystemTechnologyIn case of extremeloads. Carbonbrushes with specialprotectionof the commutatorCarbon brush withCarbon brush for orbitalCarbon brushes andSolution for professionalHigh degree of dimen-helical spring, flexiblesanders. Brush holderbrush holders with con-hedge trimmers. Thesional accuracy andwire and terminalwith special insulationstant pressure springbrass holders optimisenarrow tolerances. Brushheat disspipation result-card for high-qualitying in the system stay-compact rotary hammersing cooler


Best Performance for Household AppliancesHigh requirementsare needed to vacuumcleaner carbonbrushes: up to60,000 rpm andlong operating lifeSpecial Requirements forMaterial and DesignCarbon brushes and brush holderassemblies used in household appliancesdemand special requirements ofboth material and design. Today’smotors are designed to be smaller andlighter, whilst simultaneously increasingrotational speeds. The Small MotorTechnology Division reacted to thistrend in development trend many yearsago. In this context special value isplaced on the continuous improvementof the commutation behaviour as wellas a steady increase of efficiency.Carbon Graphite Materials –Versatile MaterialsAt Schunk carbon graphite materialsare primarily used in universal motorsdestined for household appliancesand hand-operated power tools. Theyare versatile to use and are suitablefor very diverse solutions to difficultproblems.They offer the followingadvantages:Wide range of resistivityHigh materials strengthsStability against electrical burn-offGood cleaning effect with sufficientMechanical dampingCarbon graphite carbon brushes can The Schunk Advantage –be produced with very high specific Possibility to Save Radioresistances in ranges from 35 to 3,000 Interference Suppression Coilsµ Ω m. In order to improve runningbehavior additional impregnations are Generally, Schunk carbon brushes ensurea low levels of radio interference.recommended in principle.In many cases, motor developers cando so even entirely without radio interferencesuppression coils. This resultsResin-bonded Graphitein cost reduction as well as the spaceCarbon brushes made of resin-bonded savings.graphite lead to low to medium abrasivenessduring the operation of thebrushes so that stains developingon the surface of the commutator canbe ground off. The materials haveexcellent damping and sliding propertiesand can also be used at relativelylow current loads as well as at extremelyhigh peripheral speeds.Electrographite, a material, which isvery pure and has excellent slidingproperties, is particularly suitable forapplications with high current densitiesand a low operational voltage.PerfectCarbon brush witha copper-cased steelspring for use inslicing machines.The transmission ofpower is possible toup to 5.5 A withoutflexible wireCarbon brush withlateral grooves asan assembly aid incompliance with ULregulationsCommutationCarbon brushes andholders for washingmachine motors.Optimum commutationwith direct currentand alternating currentsupplySpecial development bySchunk. This laminatedcarbon brush which consistsof two parts gluedtogether with a centralinsulating layer ensuresa decisive reduction ofcommutating currents


Production and Quality AssuranceProduction hall with modular automaticround table machinesOn Site for You as a Global PlayerSince we have various production sitesall over the world, we are one of theglobal players in carbon brushes andcarbon brush holders manufactureas well as of entire modules for smallmotors and for miniature motors.We are prepared to place productionand logistics as close as possible toour customers’ sites and we manufacturewith manual, semi-automaticand with fully automated systems.“Made by Schunk“ MeansTop QualityWe have a clearly defined commitmentto quality as well as a firmly establishedquality management throughoutthe entire small-power motor technologydivision. The individual enterpriseswithin our group are certified accordingto ISO 9001, in some casesthey are even certified according toQS 9000.In the context of an established projectmanagement for new parts, all knownquality planning and clearance processesare covered. These comprise: productionquality forward planning andpotential Failure Mode and EffectsAnalysis (FMEA) as well as a numberof further quality assurance measures.Intensive DevelopmentConsultationIn the cooperation with Schunk manymotor developers actively use ourchemistry and physics laboratories, ourradio interference measurement roomas well as the different applicationtechnologytest-benches which wehave at our disposal. We would be verypleased to test your developmentsand advise you concerning the followingsubjects:Materials: physical valuesand propertiesBrush designBrush guide, brush clearanceand brush pressureRFI – Radio FrequencyInterference suppressionImpregnationsCarbon brush running-inCarbon brush operating behaviourSwitch-off and signalling devicesMounting of two different brushmaterials in one motorQualityAssuranceFully automatic processing of carbonbrushes on automatic roundtable machines ensures a continuouslyhigh qualityRadio interference meas-Documentation andWashing machines sub-Endurance testing withCircular saw. Testing ofLong-term testingurements of electricallyprocessing of radiomitted to long-term test-professional toolsthe carbon brush oper-of permanent magnetoperated householdinterference measure-ing in order to achieveating life under variousmotorsappliances and powerment data obtainedoptimum service life forload conditionstoolscarbon brushes


GermanySchunk Kohlenstofftechnik GmbHGermany/HeuchelheimTelephone: +49 (641) 60 80Schunk Motorensysteme GmbHGermany/GanderkeseeTelephone: +49 (4222) 4 30Gerhard Präzisionspreßtechnik GmbHGermany/ObernzennTelephone: +49 (9844) 9 71 10EuropeSchunk Nordiska ABSweden/LenhovdaTelephone: +46 (474) 2 95 00Schunk UK Ltd.Great Britain/PudseyTelephone: +44 (113) 2 56 72 38Schunk Electrographite SASFrance/Nanterre CedexTelephone: +33 (1) 41 19 52 52Schunk AGSwitzerland/KilchbergTelephone: +41 (1) 7 16 46 46Schunk Wien Ges.m.b.H.Österreich/WienTelephone: +43 (1) 6 16 68 07Hoffmann & Co. Elektrokohle AGAustria/SteegTelephone: +43 (6135) 40 00Schunk Italia S.r.l.Italy/MagentaTelephone: +39 (02) 9 72 19 01Schunk Iberica S.A.Spain/PintoTelephone: +34 (91) 6 91 25 11SIRMA Elektrik KömürleriTurkey/KaraköyTelephone: +90 (212) 2 70 35 65Schunk Romania SRLRumania/BukarestTelephone: +40 (21) 3 37 28 60AmericaSchunk Graphite Technology LLCUSA/Menomonee FallsTelephone: +1 (262) 2 53 87 20Schunk Electro Carbón, S.A. de C.VMexico/OcoyoacacTelephone: +52 (728) 2 82 78 90Schunk do Brasil Ltda.Brazil/São PauloTelephone: +55 (11) 46 13 32 00AustraliaSchunk (Aust) Pty., Ltd.Australia/RowvilleTelephone: +61 (3) 97 53 35 88AsiaSchunk Metal & Carbon (I) PVT. Ltd.India/BangaloreTelephone: +91 (80) 8 51 67 08Pichit Industrial Works Co., Ltd.Thailand/PichitTelephone: +66 (56) 6 32 10 12Schunk General Carbon (Panyu) Co., Ltd.China/PanyuTelephone: +86 (20) 84 71 47 61Schunk Carbon (M) Sdn. Bhd.Malaysia/PuchongTelephone: +60 (3) 58 82 29 70Schunk General Carbon Ltd.China/Hong KongTelephone: +852 (2) 4 08 66 88Seung Lim Carbon Metal Co., Ltd.South Korea/Ansan-CityTelephone: +82 (31) 4 91 27 22Schunk Praha s.r.o.Czech Republic/PilsenTelephone: +420 (377) 45 41 1113.02e/2004Schunk Kohlenstofftechnik GmbHRodheimer Strasse 5935452 HeuchelheimGermanyTelephone: +49 (641) 608-0Telefax: +49 (641) 608-12 23www.schunk-group.comE-Mail: infobox@schunk-group.com

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