Lub hauv paus ntsiab lus ua haujlwm ntawm Siemens motors yog raws li Faraday txoj cai ntawm electromagnetic induction thiab Lorentz force law. Nws feem ntau muaj ob ntu: stator thiab rotor. Lub stator yog qhov tsis tuaj yeem txav mus los, feem ntau yog tsim los ntawm cov coils raug mob nyob ib ncig ntawm cov tub ntxhais hlau. Thaum tam sim no ntws los ntawm cov coils, ib qho chaw magnetic generated. Lub rotor, raws li lub rotating ib feem ntawm lub cev muaj zog, kuj muaj coils raug mob nyob ib ncig ntawm ib tug hlau core, thiab nws kuj generates ib tug sib nqus teb thaum energized. Thaum cov dej ntws hauv stator thiab rotor cuam tshuam, raws li txoj cai Lorentz quab yuam, lub torque yog tsim, ua rau lub rotor pib tig.
Kev sib hloov ntawm lub rotor ua rau muaj kev hloov pauv tam sim no hauv stator. Raws li Faraday txoj cai ntawm electromagnetic induction, qhov hloov magnetic teb no tsim ib qho induced electromotive force (EMF). Qhov no induced EMF ua rau ib tug hloov nyob rau hauv lub tam sim no nyob rau hauv lub rotor, uas nyob rau hauv lem generates ib tug rov qab magnetic teb, ua rau lub rotor mus txuas ntxiv rotating. Los ntawm kev hloov pauv ntawm cov hlau nplaum tas li thiab qhov rov qab sib nqus teb, lub rotor tuaj yeem tig mus txuas ntxiv, yog li paub txog kev hloov hluav taws xob rau hauv lub zog txhua yam.