U nder t he i mpact of el ect r o - magnet i c act ivat i on and margi nal l oad di sr upt i on, el ect r o - mechani cal l i nki ng r esonance can be gener at ed on t he mot or dr iveshaf t of t he moder at el y sl i ci ng segment of a shear er. I n t hi s sense, t hi s hypot hesi s expl or es t he vi br at i on pr oper t i es of a mot or r ot or and t he eff ect of el ect r o - mechani cal coupl er s. B esi des, syst em model appr oxi mat e sol ut i on i s obt ai ned t hr ough t he mul t i pl e t i me scal es met hod i n t he i nst ance of sub- har moni c r esonance, and t he R ung- Kut t a P r ocedur e of t he f our t h or der defi ned t he st eady- st at e sol ut i on. I n addi t i on, t he el ect r i c and magnet i c fact or s cont ai ni ng t he angl e of t he oper at i onal st r engt h fact or, t he coupl e of pol e combi nat i ons, t he per manent magnet i ndex, t he sat ur at i on magnet i zat i on cor r el at i on and t he t echni cal par amet er s concer ned f or t he t ensi l e vi br at i ons of t he r ot or st r uct ur e, such as t or si onal r ot or st i ff ness and l ongi t udi nal l oad, ar e t est ed. I n consi der i ng Lyapunov’s fi r st i ndi r ect pr ocedur e, t he equi l i br i um of t he st eady st at e appr oach near by i t s wor st r esonance si t uat i on i s r evi ew ed. T he r esul t s on t he st eady st at e sol ut i on of t he var i ous par amet er s ar e sur veyed and di scussed. T he si mul at i on out comes ar e cal cul at ed usi ng t he sof t war e MAT L A B pr ogr am.