Transcription of BRUSHESFORELECTRICALMACHINES
1 ISO 900 1: 200 0 I ISO 14 00 1 BRUS HESFOR ELECTRICAL MACHINESTech nic al gu ide3 Dataher ein con taine d are pro videdfor generalinfor mationpurp ose on ly and are no t bi ndi ng. CA RBONELORRAINE shallhaveno liab ility whatsoever with respectto , repr oductionor translationof anyinf or mati on containe d he re in, in who le or in part,is strictlypr oh ibitedwith ou t pri or wr itte n co nsentof CARBONE s Th e grad e gr oups4 Pr in cipal ch aracteris tic s of br us h gra des6 Rati onal izati on of br ush grades8 Ap plic ati on s9 Important remarks11 Sh apesand maindimensi ons of brushes12 Fi tti ngs an d mou nting methods13 Fi tti ngs for dividedbru sh es14 Th e br us h on th e machine15 Rec om men dations for fitti ng brusheson ma chi nes20 Othe r avai lablese rvic es23 On ordering bru shes23 AEGLF C4 THE GRADEGR OUPSThe re are five princ ipa l gr oups ea ch correspondingto a particularmod e of cer tainpr incipal gr oupsit is convenientto adjoinon e subgro up concerningimp reg nat ed Note
2 STA BE 16-22tr eatsthis subjectand indicatesthe particular pr opertiesof thesespe cial gi ve be low a sum ma ry on the methodof man ufacture of each gr oup,the mai n characterist ic s of eachgro up (givenund er th e con ventionalheadingson pag es 6 and 7) , the principal applicationsand the lim it s ofapp li cati on for the ma jo rity of gr adesin the OG RA PHI TIC BRUSHESThe se are mad e fr om mixtur es composedof amo rphouscarbon powders,natura l and artificialgra phitesgro und , selectedand agglo merated witha pow der s thusmoistenedand dr yed are compressed and the platesthusobtainedare cookedin ord er tocoke the bind characterBrus he s ha vinga good co mm uta ting abil ity, witha good polishingaction and a me diumvaluecontact dr op.
3 The y res ist hightem pera tu res and va in cipalapplicati onsOld slowmac hin es wi th or wi thou t in te rpoles and generally at lo w vol machines workingwi thpermanentmagnets, serv omo tor s, universal mot t of appl icat ionCur re nt den sity 8 to 16 A/cm2(ma ximum), dep endingon case le per ipheralspeed:up to 25 eThe re is a ra nge of carb ographiticgrad es fo r universal motor s of fractionalpo wer and up to se se products are not sta ted in thi s ,ask for the spe cif ic lit erat ur IC BR USHESPr eparedfromcarbo n po wders and coketheyare thensubject ed to otherthermal tre atm entsparticula rly athigh te mperat ure (above 2,50 0 C )
4 In orderto transformthe basicamorphouscarboninto ar n char ac terThese brushes ha ve medium cont act dropan d low or medium fr iction,theyhav e reducedlo ssesand areparti cularlyada pt ed to hig h in cipalapplicati onsFor all industrial mode rn ma chi nes whether stationaryor for trac tion,highsp eeds,low,mediumand highvoltageand constant or va h current densities:8 to 12 A/c m2(ma xi mum)und er stea dy conditions,20 to 25 A/ cm2(max im um) for shor t dur atio n pea le per ipheralspeed:up to 50 PHI TE BR USHESThe bas e constitue nt is purifiednaturalgraphiteor previouslygr oundartif icialgraphite,the n mixe d withot herconstituentsin well definedqua ntities,agglomeratedwithapp rop ri ate bind ers and fir ed in or der to cokethebinde characterSoft, plas tic bru sheshavingver y goodre sistanceto shockand mechanicalvib cleaningpr oper inci pal applicatio nsSte el and stainlesssteelring s fo r highspeedsynchronous it of applicati onBr ush cur rent density:10 to 13 A/c m2(m aximum).
5 Adm iss ible per ipheralspeed:65 to 90 m/s (evento 100m/ s).MET AL GRA PHI TE BR USHES(CG - MC - CA)The se bru she s are madeby mixingin suitableproportions purified naturalgraphiteand copper in pow der formwi th the ad ditionof pow de rs of othe r mixedpo wdersar e then compressedand bak ed in anatmosphere and at a temperatur e chosento give the degr ee of solidity and cohe siondesir ed .Eq uallya partof the met al gra phitegro up ar e tho se brushes(EG andA) wh ich are impregnatedun derpress ure withpure mo lte n copperor a mixture of mo ltencop per,si lveror salt s (of metalimpregnatedpag e 7).Maincharacte rDe nse or ve ry densebrusheswithlow friction and very lo w contact dro p ther efor e le adingto very low loss esand hi gh curr inci pal applicatio nsDC machine s of slowspeedand low or verylo w voltage.
6 Br onz e ringsof slowspe ed as ynchronous mo tors ,heav ily loaded, withor without brushlifti ng gea r. Ring s of synchronousmotorsof low or medium gh cur rent collectionon rota ting collectors, specialmac hine s, slip -ringas sem blies .Lim it of applicati onBr ush cur rent density;12 to 30 A/cm2(maximum)continuously,about 100A/cm2insta nta neoustra nsientpeaksaccordingto me tal conte iss ible per ipheralspeed:up to 35 m/s,accordingto met al re is a ra nge of coppergr aphiteand metalgraphitegradeswhichperm it the unit ary mouldingof mas sprod uc ed brus hes fo r smalllow se products are not sta ted in thi s technical gui ase,contact E-GRAPHITE BR USHESNat ura l or ar tificial graphiteis grou nd and agg lomerated with a the rmo- hardeningresinof the bakelit e typ mix ture is compressedand polymerizedat a suitablete mpe rBr ushesare of highmechanica l and electrical resistance,good com mutatingpr ope rties.
7 Cleaningpro pe rtieswithhi gh con tact dropand ther wo rk at very lo w curr ent den sitie inci pal applicatio nsAC com mutator motorsof the Schrageor Schor ch DC machines,eithertraction or stationary,ofme di um speed an d it of applicati onBr ush cur rent density:va ry withgr ades(betteron lo w loa d mot ors ).Adm iss ible per ipheralspeed:up to 40 teThe re is a ra nge of resinag glo mer atedgradeswh ich permit s the unitarymo uldingof masspr oducedbrushesfor modern motorsof fr actiona l powerand severalkW. Pl eas e, NC IPAL CH ARA CT ER IS TICS OF BRU SHApparentdensityResistivityContactdropS horeHardnessFrictionFlexuralstrengthMaxi mumcurrentdensityUpperspeedlimitMetalcon tentCa rbo -gra phit icSof tgra phit icEl ec tr o-gra phit icImpregnatedelec tro-gra phit icGRADEGRAD EGROUP.
8 C mMPa U en VA/c m2m/ sec .% .inc hPSIA/ inch2ft/ se 12 11,752 2503026ML12 to 20 15(886 )(75 to 125 )( 49)A 12 21,6745 0002721HL10 to 12 15(17 716)(65 to 75)( 49)A 17 61,6052 5004020HL8 to 1030(20 670)(50 to 65)(98)A 21 01,5725 0003016ML8 to 10 25(9 840)(50 to 65)( 82)A 25 21,5745 0002716HL10 to 12 25(17 716)(65 to 75)( 82)LF C 5011,461 9001010ML6 to 1075(7 48 )(40 to 65)(246)LF C 5541,262 0001212ML11 to 1310 0(7 48 )(71 to 84)(328)EG 34 D1,6 01 1004025MM1250(4 33 )(75)(164)EG 389P1,491 6002919MM1250(6 30 )( 75)(164)EG 3961,521 6002719MM1250(6 30 )(75)(164)EG 3621,602 5003521MM1250(9 84 )(75)(164)EG 40P1,623 2005727MM1250(1 26 0)(75)(164)EG 3131,665 0005021ML1250(1 968)(75)(164)EG 3671,534 1005221MM1250(1 61 4)(75)(164)
9 EG 3321,524 2005221MM1250(1 653)(75)(164)EG 3871,603 5006031MM1250(1 378)(75)(164)EG 3001,574 2005824ML/M1250(1 65 3)(75)(164)EG 981,603 4006433MM1250(1 33 8)(75)(164)EG 3691,555 5006022MM1250(2 165)(75)(164)EG 319P1,467 2005226HM1250(2 834)(75)(164)EG 3211,467 2005226HM1250(2 834)(75)(164)EG 3651,625 3004015MM1250(2 08 0)(75)(164)EG 70991,721 1004034MM1245(4 33 )(75)(148)EG 95991,611 6003328MM1245(6 30 )(75)(148)EG 91171,693 3007736MM1250(1 30 0)(75)(164)EG 80191,774 7007731MM1245(1 85 0)(75)(148)EG 80671,673 9007736MM1245(1 53 5)(75)(148)EG 82201,825 0009048MM1250(1 968)(75)(164)EG 70971,684 0008035MM1250(1 57 5)(75)(164)EG 3411,577 2007434HM1250(2 834 )(75)(164)EG 64891,577 2007535HM1250(2 834 )(75)(164)EG 82851,705 4007127MM1250(2 126 )(75)(164)EG 76551,705 6006833MM1250(2 20 0)(75)(164)CON TAC T DROPThe val ue of conta ct dropand fr ic tion is givenby the useof symb ols ha vingth e fol lo wingsignificanceCon tact dro pSym bolInd icat io nin voltsFrictionSumof bothpolaritiesHHighH>3H> <M< <M< <L< < ry < VL < ry very lowVVL < (ACCORDINGTO STANDARDCEI 60413)GRA DEGRADEGROUP.
10 CmMPa U en VA/ cm2m/sec% .in chPSIA/ inch2ft/ secBG 4121, 8214 00036HM8 to 1035(5 512)(51 to 77 )(115 )BG 4691, 8010 00034HM6 to 835(3 938)(77)(115 )BG 4001, 5025 00025HM8 to 1040(9 842)(51 to 77 )(131 )C 695 82, 5035030 VLM10 to 25 3225(13 8)(130to 220)(98)CG 332, 3055025VL/LL10 to 124030(21 6)(65 to 75 )(131 )C 838 62, 8010029 VLL/M20 to 30 3046(39 )(130to 220)(98)CG 6512, 9513030 VLL12 to 143549(51 )(75 to 90)(115 )CG 6262, 8818045 VLL12 to 153049(71 )(75 to 90)(115 )CG 6654, 052850 VLL15 to 203065(11 )(100to 130)(98)CG 754, 651255 VVLL162577(4)(105 )(82)OM C6,00777 VVLL25 to 302090(3)(160to 200)(66)MC 79P5, 20898 VVLL/M25 to 302083(3)(160to 200)(66)MC 126, 0032173 VVLL/M25 to 302091(12 )(160to 200)(66)
