Shaft current ndiye wowononga njira yoberekera yagawo atatu galimoto mankhwala, ndipo mphamvu ya shaft ikangopangidwa, ipangitsa kuti makina onyamula ma mota awonongeke pakanthawi kochepa. Malingana ndi zofunikira za m'badwo wamakono, magetsi ndi dera, derali ndi losiyana ndi dera losavuta, palibe mzere womveka bwino, n'zovuta kuyeza zamakono, kotero kuti cholinga chachikulu ndi kuzindikira kotheka ndiko kuzindikira kwa voteji ya shaft.
Kwa osiyana3 phase induction motorsndi kubereka dongosolo dongosolo, kukana kusiyana kwa dera laling'ono, ndipo mphamvu yaikulu ndi tsinde voteji lolingana Motors osiyana, pamene kutsinde voteji kufika pa mtengo wina (nthawi zambiri 300-500mV), izo zidzachititsa kuti filimu mafuta a dongosolo lonyamula kusweka, ndi kutulutsa lalikulu kutsinde panopa. Shaft voltage imatanthawuza mphamvu yamagetsi yomwe imapangidwa pakati pa mbali ziwiri za shaft yamoto kapena pakati pa shaft yozungulira ndi mpando wonyamula. Zimayamba chifukwa cha kusalinganika kwa maginito kuzungulira shaft yamoto. Kuthamanga kwa maginito kosagwirizana kumeneku kumadula tsinde lozungulira ndikupangitsa mphamvu ya shaft kumalekezero onse a shaft.
Nthawi zonse, filimu yopaka mafuta pakati pa shaft ndi bere imagwira ntchito yoteteza. Mphamvu ya shaft ikakwera kufika pamtengo wakutiwakuti, makamaka injini ikayamba, filimu yamafuta opaka mafuta siinapangidwe mokhazikika, voteji ya shaft imaphwanya filimu yamafuta kuti ipange loop, kutulutsa mphamvu ya shaft yochuluka, nthawi zina mpaka mazana angapo mpaka masauzande a ma amp. Malinga ndi kukula kwa shaft volt, imatha kuyeza ndi mita ya millivolt (yomwe imatchedwanso high resistance voltmeter). Kuchokera pakuwunika kagawidwe ka magawo, shaft yamoto ndi nyumba zimasungidwa kudzera mumafuta omwe amanyamula, pomwe voteji ya shaft ilipo, ndiye kuti, pali kusiyana komwe kumatha kumapeto onse a shaft yamoto. Pamene galimotoyo ipatsidwa mphamvu, imatha kuyesedwa mwachindunji kudzera muyeso yoyezera ya voltmeter, ndiko kuti, imodzi mwazofufuza ikugwirizana kwambiri ndi shaft (chifukwa shaft ili mu dziko lozungulira), koma pewani njira yofunikira kuti muteteze zoopsa; Kufufuza kwina kwa voltmeter kuyenera kukhala kolumikizana bwino ndi nyumba yamagalimoto, ndiko kuti, ndikofunikira kupewa malowo ndi utoto wapamtunda, ndikuwonetsetsa kuti nyumba yamagalimoto imakhazikika bwino.
Ambiri mwa machitidwe onyamula a high-voltagemagawo atatu moterendi ma frequency motors atengapo zofunikira pa shaft current, koma izi sizikhudza kuzindikira kwa shaft voltage.