Ejikọrọ moto DC na ọkụ ọkụ site na ahịhịa commutator.Mgbe nke ugbu a na-agafe na eriri igwe, oghere magnetik na-emepụta ike, na ike na-eme ka moto DC na-atụgharị iji mepụta torque.A na-enweta ọsọ nke moto DC brushed site n'ịgbanwe voltaji na-arụ ọrụ ma ọ bụ ike ndọta.Moto ahịhịa na-emekarị ka ọ na-emepụta mkpọtụ (ma ụda na ọkụ eletrik).Ọ bụrụ na mkpọtụ ndị a anọghị iche ma ọ bụ kpuchie ya, mkpọtụ eletrik nwere ike igbochi sekit moto, na-ebute ọrụ moto na-akwụsighị ike.Enwere ike kewaa mkpọtụ eletrik nke moto DC na-emepụta ụzọ abụọ: nnyonye anya electromagnetic na mkpọtụ eletrik.Ọ na-esiri ike ịchọpụta ụzarị ọkụ eletrik, ozugbo achọpụtara nsogbu, ọ na-esiri ike ịmata ọdịiche dị na ya na isi iyi ndị ọzọ.nnyonye anya ugboro redio ma ọ bụ nnyonye anya radieshon electromagnetic bụ n'ihi nnabata elektrọnịkị ma ọ bụ radieshon eletrọnịkị na-esi na isi mmalite pụta.Igwe ọkụ eletrik nwere ike imetụta ịdị irè nke sekit.Ụda ndị a nwere ike iduga nbibi nke igwe dị mfe.

Mgbe moto na-agba ọsọ, ọkụ na-apụta mgbe ụfọdụ n'etiti brọsh na onye na-ebugharị.Sparks bụ otu n'ime ihe na-ebute mkpọtụ eletriki, ọkachasị mgbe moto na-amalite, na oke mmiri na-asọba na ikuku.Igwe mmiri dị elu na-ebutekarị mkpọtụ dị elu.Ụda ụda yiri nke ahụ na-eme mgbe brushes na-anọgide na-akwụsighị ike n'elu commutator na ntinye na moto ahụ dị elu karịa ka a tụrụ anya ya.Ihe ndị ọzọ, gụnyere ihe mkpuchi nke emebere n'elu ebe ndị na-agagharị agagharị, nwekwara ike ịkpata ọgba aghara ugbu a.

EMI nwere ike ijikọ n'ime akụkụ eletriki nke moto ahụ, na-eme ka sekit moto na-arụ ọrụ nke ọma ma mebie arụmọrụ.Ọkwa EMI na-adabere n'ihe dị iche iche dị ka ụdị moto (ahịhịa ma ọ bụ brushless), ebili mmiri na ibu.N'ozuzu, moto brushed ga-emepụta EMI karịa moto na-enweghị brushes, n'agbanyeghị ụdị ọ bụla, imewe nke moto ga-emetụta nke ukwuu ntapu nke electromagnetic, obere brushed moto mgbe ụfọdụ na-emepụta nnukwu RFI, na-abụkarị mfe LC Low pass filter na metal case.

Ụda ụda ọzọ nke ọkụ ọkụ bụ ọkụ ọkụ.Ebe ọ bụ na nkwụsi ike dị n'ime nke ọkụ eletrik abụghị efu, na ntụgharị ntụgharị nke ọ bụla, a ga-agbanwe moto na-adịghị agbanwe agbanwe ka ọ bụrụ voltaji ripple na ọdụ ọkụ ọkụ, na DC moto ga-emepụta n'oge ọrụ dị elu.mkpọtụ.Iji belata nnyonye anya electromagnetic, a na-edobe moto n'ebe dị anya site na sekit nwere mmetụta dị ka o kwere mee.Igwe mkpuchi igwe nke moto na-enyekarị nchekwa zuru oke iji belata ikuku EMI, mana mkpuchi igwe agbakwunyere kwesịrị inye mbelata EMI ka mma.

Ihe mgbaàmà elektrọnik nke moto na-emepụta nwekwara ike ịlụ di na nwunye na sekit, na-akpụ ihe a na-akpọ nnyonye anya nkịtị, nke enweghị ike iwepụ site na ichebe ma nwee ike belata nke ọma site na nzacha LC dị ala.Iji belata mkpọtụ eletrik ọzọ, a chọrọ nzacha na ọkụ eletrik.A na-emekarị ya site n'ịgbakwunye capacitor buru ibu (dị ka 1000uF na n'elu) n'ofe ọdụ ọkụ iji belata nguzogide dị mma nke ọkụ eletrik, si otú ahụ na-emezi nzaghachi na-adịru nwa oge, na iji eserese sekit na-eme ka ọ dị nro (lee foto dị n'okpuru ebe a) mezue ihe nzacha , overvoltage, LC filter.

Capacitance na inductance na-apụtakarị n'ụzọ symmetrically na sekit iji hụ na nguzozi nke sekit ahụ, mepụta ihe nzacha dị ala LC, ma gbochie mkpọtụ mmegharị nke ahịhịa carbon na-emepụta.The capacitor tumadi na-egbochi voltaji kacha elu nke a na-enweta site na nkwụsịtụ nke ahịhịa carbon, na capacitor nwere ọrụ nzacha dị mma.Echichi nke capacitor na-ejikọta ya na waya ala.Inductance na-egbochi mgbanwe mberede nke oghere dị ugbu a n'etiti brush carbon na mpempe ọla kọpa commutator, na ntinye ala nwere ike ịbawanye arụmọrụ imewe na nzacha nke nzacha LC.Inductor abụọ na capacitors abụọ na-etolite ọrụ nzacha LC symmetrical.A na-ejikarị capacitor eme ihe iji kpochapụ voltaji kacha elu nke brush carbon na-emepụta, a na-ejikwa PTC wepụ mmetụta nke oke okpomọkụ na oke elu ugbu a na sekit moto.