Lub ntsiab sib nqus hlau excitation winding ntawm salient-ncej synchronous lub tshuab hluav taws xob yog qhov sib zog winding, yog li thaum tsis muaj lub nra, qhov sib nqus muaj peev xwm ntawm tus ncej loj hauv qhov chaw yog lub suab sib dhos. Vim tias qhov huab cua tsis sib xws hauv qab tus ncej, qhov chaw sib nqus tseem ceeb yog lub tiaj-saum
Raws li phau ntawv Fourier, ntab-tiaj sab saum toj tuaj yeem decomposed mus rau hauv lub nthwv dej dav dav thiab qhov ntawm cov xaj xaj tsis tseem ceeb spectrum tsis, uas qhov thib peb harmonic muaj cov ntsiab lus ntau tshaj plaws. Txij li thaum lub suab ncej ntawm peb lub sib nqus sib nqus sib nqus ua liaj ua teb yog 1/3 ntawm cov ncej sib nqus ntawm qhov chaw sib nqus, uas yog, φ3=1 / 3φ1. Yog li ntawd, thiaj li yuav tau txais qhov thib peb lub cev ua kom muaj zog ntawm harmonic windings, kev npaj ntawm harmonic windings yuav tsum sib haum mus rau qhov thib peb harmonic sib nqus, uas yog, lub suab ntawm cov harmonic windings yuav tsum yog 1/3 ntawm lub hauv paus windings. Peb txheej muaj kev cob cog rua hauv ntxeev rov qab los tsim ib pawg coil. Xws li muaj nyob hauv Daim Duab 12-47.
Rau cov yoj siv sib xyaw ua ke Bo1 ntawm lub ntsiab sib nqus nyob rau hauv qhov thib peb harmonic winding ntawm AC synchronous lub tshuab hluav taws xob, qhov sib haum sab ntawm txhua lub kauj muaj qhov sib txawv ntawm 60" lub kaum sab xis hluav taws xob, thiab qhov chaw muaj peev xwm kuj txawv 60 ° hluav taws xob lub kaum sab xis, raws li hauv daim duab 12-47 (b) Cov kev taw qhia zoo thiab cov yoj yoj muaj peev xwm phasor daim duab qhia tau hais tias E1 = E11-E12 + E13 = 0, uas yog , nyob rau hauv lub hauv paus ntsiab lus, lub peev xwm ntawm harmonic winding yog xoom.
Rau qhov thib peb harmonic winding ntawm lub tshuab hluav taws xob synchronous mus rau harmonic tivthaiv Bo3 ntawm lub ntsiab sib nqus, qhov sib phim ntawm txhua lub kauj hlau sib txawv los ntawm 180 hluav taws xob. Los ntawm Daim Duab 12-47 (c), nws tuaj yeem pom tias E31-E32+E33 = 3E31, uas yog, nyob rau ntawm qhov thib peb qhov kev phom sij ua kom muaj qhov sib luag ntawm cov cua tsis pub dhau lub viav vias cua sib tw yog qhov ntau tshaj. Tom qab lub sijhawm thib peb no tsim kev kub ntxhov, nws ua haujlwm ua qhov kev hloov kho lub zog ntawm lub tshuab hluav taws xob synchronous.
