Therearemanytypesofsingle-phasemotors,whichcanbedividedintotwocategoriesaccordingtodifferentstartingmethods.Oneisthecoveredpolemotor,whichcanbedividedintotwotypes:thesalientpolecoverpoleandthehiddenpolecoverpoleresistancephasesplittingtype;Theothertypeisthesplit-phasemotor,whichcanbedividedintocapacitivesplit-phaseandinductivesplit-phase.
Intheproductionprocessofsomeindustries,theproductneedstobewoundonthedrum,aproblemthatneedstobesolvedhereishowtomakeitsdiameterfromthebeginningtothegradualincreaseofthewholeprocess,keepthechangeoftensionandlinearspeedwithintheallowablerange?YLJseriestorquemotorshavesuchelectricalcharacteristics.