Lub DC lub cev muaj zog txuas nrog lub zog hluav taws xob los ntawm kev txhuam commutator.Thaum cov tam sim no ntws los ntawm lub kauj, lub magnetic teb generates ib tug quab yuam, thiab lub zog ua rau DC lub cev muaj zog tig los tsim torque.Qhov ceev ntawm brushed DC lub cev muaj zog yog ua tiav los ntawm kev hloov lub zog ua haujlwm lossis lub zog sib nqus.Txhuam motors nyiam ua kom nrov nrov (ob qho tib si acoustic thiab hluav taws xob).Yog tias cov suab nrov no tsis raug cais tawm lossis tiv thaiv, lub suab nrov hluav taws xob tuaj yeem cuam tshuam nrog lub cev muaj zog, ua rau lub cev tsis muaj zog.Cov suab nrov hluav taws xob tsim los ntawm DC motors tuaj yeem muab faib ua ob pawg: electromagnetic cuam tshuam thiab hluav taws xob nrov.Cov hluav taws xob hluav taws xob tsis yooj yim rau kev kuaj mob, thiab thaum kuaj pom qhov teeb meem, nws nyuaj rau kev paub qhov txawv ntawm lwm qhov ntawm lub suab nrov.Xov tooj cua zaus cuam tshuam los yog electromagnetic hluav taws xob cuam tshuam yog vim electromagnetic induction los yog electromagnetic hluav taws xob tawm los ntawm lwm qhov chaw.Cov suab nrov hluav taws xob tuaj yeem cuam tshuam rau kev ua haujlwm ntawm circuits.Cov suab nrov no tuaj yeem ua rau yooj yim degradation ntawm lub tshuab.

Thaum lub cev muaj zog khiav, qee zaus muaj qee zaus tshwm sim ntawm cov txhuam hniav thiab cov commutator.Sparks yog ib qho ua rau lub suab nrov ntawm hluav taws xob, tshwj xeeb tshaj yog thaum lub cev muaj zog pib, thiab cov kwj dej kuj tseem ntws mus rau hauv cov windings.Cov dej ntws siab dua feem ntau ua rau muaj suab nrov dua.Cov suab nrov zoo sib xws tshwm sim thaum cov txhuam hniav nyob twj ywm tsis ruaj khov ntawm qhov chaw commutator thiab cov tswv yim rau lub cev muaj zog ntau dua li qhov xav tau.Lwm yam tseem ceeb, suav nrog kev rwb thaiv tsev tsim rau ntawm qhov chaw commutator, tuaj yeem ua rau tsis muaj kev ruaj ntseg tam sim no.

EMI tuaj yeem ua ke rau hauv cov khoom hluav taws xob ntawm lub cev muaj zog, ua rau lub cev muaj zog ua haujlwm tsis zoo thiab ua haujlwm tsis zoo.Qib ntawm EMI nyob ntawm ntau yam xws li hom lub cev muaj zog (txhuam lossis tsis txhuam), tsav waveform thiab thauj khoom.Feem ntau, brushed motors yuav tsim ntau EMI dua li brushless motors, tsis hais hom twg, qhov tsim ntawm lub cev muaj zog yuav cuam tshuam rau cov electromagnetic to, me me brushed motors qee zaum tsim loj RFI, feem ntau yooj yim LC Low pass lim thiab rooj plaub hlau.

Lwm lub suab nrov ntawm lub hwj chim mov yog lub hwj chim mov.Txij li thaum lub zog sab hauv ntawm cov khoom siv hluav taws xob tsis yog xoom, nyob rau hauv txhua lub voj voog kev sib hloov, lub cev tsis muaj zog tam sim no yuav raug hloov mus rau hauv qhov hluav taws xob ripple ntawm cov khoom siv hluav taws xob, thiab DC lub cev muaj zog yuav tsim thaum lub sijhawm ua haujlwm siab.suab nrov.Txhawm rau txo cov kev cuam tshuam ntawm electromagnetic, cov motors tau muab tso rau kom deb li deb ntawm cov rhiab circuits li sai tau.Cov hlau casing ntawm lub cev muaj zog feem ntau muab kev tiv thaiv txaus los txo cov huab cua EMI, tab sis cov hlau casing ntxiv yuav tsum muab EMI txo kom zoo dua.

Electromagnetic signals generated los ntawm motors kuj tuaj yeem ua ke rau hauv circuits, tsim kom muaj kev cuam tshuam ntawm hom kev cuam tshuam, uas tsis tuaj yeem tshem tawm los ntawm kev tiv thaiv thiab tuaj yeem txo qis los ntawm qhov yooj yim LC low-pass lim.Txhawm rau txo cov suab nrov hluav taws xob ntxiv, yuav tsum tau lim dej ntawm lub hwj chim.Nws feem ntau yog ua los ntawm kev ntxiv lub capacitor loj (xws li 1000uF thiab saum toj no) hla lub hwj chim terminals kom txo tau qhov zoo ntawm cov khoom siv hluav taws xob, yog li kev txhim kho cov lus teb tsis ntev los no, thiab siv daim duab lim-smoothing Circuit Court (saib daim duab hauv qab no) rau ua kom tiav cov overcurrent, overvoltage, LC lim.

Capacitance thiab inductance feem ntau tshwm sim symmetrically nyob rau hauv Circuit Court los xyuas kom meej qhov sib npaug ntawm Circuit Court, tsim ib tug LC low-pass lim, thiab suppress lub suab nrov conduction generated los ntawm cov pa roj carbon txhuam.Lub capacitor feem ntau suppresses lub ncov voltage generated los ntawm random disconnection ntawm cov pa roj carbon txhuam, thiab lub capacitor muaj ib tug zoo filtering muaj nuj nqi.Lub installation ntawm lub capacitor feem ntau txuas nrog hauv av xaim.Lub inductance tsuas yog tiv thaiv qhov kev hloov pauv tam sim no ntawm qhov sib txawv ntawm cov pa roj carbon txhuam thiab daim ntawv commutator tooj liab, thiab cov hauv av tuaj yeem ua rau kev tsim qauv thiab kev lim dej ntawm LC lim.Ob lub inductors thiab ob lub capacitors tsim ib qho symmetrical LC lim muaj nuj nqi.Lub capacitor feem ntau yog siv los tshem tawm qhov siab tshaj qhov hluav taws xob tsim los ntawm cov pa roj carbon txhuam, thiab PTC yog siv los tshem tawm qhov cuam tshuam ntawm qhov kub thiab txias ntau dhau ntawm lub cev muaj zog.