Shaft current waa dhibaato caadi ah oo aan laga fursan karinmatoorada korantada sareiyomatoorrada-soo noqnoqda. Hadda shaft-gu waxay dhaawac weyn u geysan kartaa habka wax-qaadista ee matoorka. Sababtan awgeed, warshado badan oo matoorrada soo saara ayaa isticmaali doona hababka dahaarka ama tillaabooyinka la dhaafo si looga fogaado dhibaatooyinka hadda taagan.
Shaft current waxa la abuuraa sababta oo ah qulqulka birlabeedka oo isbedela wakhtiga ayaa mara loop ka ka kooban shafka mootada, xajmiyada iyo qolka wax-qaadista, taas oo keenta danab shaft ah ee shafka iyo dhalisa hadda marka wareegga la shido; waa koronto-yar, ifafaale jireed oo aad u sarreeya taas oo dhaawac weyn u geysata hab-dhiska matoorka waxayna baabi'in doontaa xadhkaha koronto-soo-saarka muddo gaaban gudaheed.
Feeritaanka xudunta matoorku waa gabal faneed u eg oo leh meel bannaan oo salka ku haysa feerka; xudunta kala qaybsan ee matoor weyn iyo eccentricity ee rotor yihiin arrimaha muhiimka ah ee jiilka usheeda dhexe hadda. Sidaa darteed, hadda shaft wuxuu noqday dhibaatada ugu weyn ee matoorada waaweyn.
Si looga fogaado dhibaatada hadda jirta, tallaabooyinka lagama maarmaanka ah waa in la qaadaa xulashada iyo naqshadeynta qaybaha iyo qaybaha si aragti ahaan loo baabi'iyo waxyaabaha keena qulqulka qulqulka. Tirada kala-goysyada S ee wareegga wareegga waxa la xakameeyaa oo lagu hagaajiyaa xidhiidhka ka dhexeeya S iyo qaybiyaha guud ee ugu weyn t tirada lammaanaha tiirka mootada.
Marka S/t uu yahay nambar siman, ma jirto wax shuruud ah oo lagu dhalinayo danab shaft ah, dabiici ahaanna ma jiri doonto wax hadda jira; Marka S/t uu yahay nambar aan caadi ahayn, waxay aad ugu dhowdahay in korantada shafka la dhaliyo, iyo shaft current la dhalin doono. Xitaa haddii nooca matoorka uu yahay matoor soo noqnoqda warshadaha, waxaa jiri doona dhibaatooyin hadda jira. Sidaa darteed, matoorada waaweyn, tallaabooyinka looga hortagayo qulqulka qulqulka ayaa guud ahaan la qaadayaa.
Intaa waxaa dheer, matoorrada soo noqnoqda ee doorsooma sidoo kale waa mid ka mid ah sababaha keenaya soo saarida shaft hadda sababtoo ah hab-raaca sare ee sahayda tamarta soo noqnoqda ee isbeddelka ah. Si kasta oo uu u awood badan yahay matoorka soo noqnoqda doorsoomayaasha, waxaa laga yaabaa inuu jiro shaft current. Sidaa darteed, badanmatoorada inta jeer ee doorsooma tamarta yarwaxay isticmaali doonaan dahaarka dahaarka ah, halka inta badan matoorada awooda sare ay isticmaali doonaan daboolka dhamaadka dahaarka ah, ama ay qaadi doonaan tallaabooyinka dahaadhka ee booska usheeda dhexe; warshadeeyayaasha qaarkood, si loo hubiyo wada jirka matoorada soo noqnoqda ee kala duwan iyo qaybaha matoorrada caadiga ah ee warshadaha, waxay qaadi doonaan tillaabooyin la dhaafi karo booska daboolida.