▁Mexican ▁polit icians ▁Category : A gr icult ural ▁engine ers ▁Category : M ex ican ▁engine ers ▁Category : 2 1 st - century ▁engine ers ▁Category : 2 0 2 0 ▁mur ders ▁in ▁North ▁America <0x0A> </s> ▁A ▁magnetic ▁coupling ▁is ▁a ▁coupling ▁that ▁trans fers ▁tor que ▁from ▁one ▁sh aft ▁to ▁another , ▁but ▁using ▁a ▁magnetic ▁field ▁rather ▁than ▁a ▁physical ▁mechanical ▁connection . ▁▁ ▁Mag net ic ▁sh aft ▁cou pl ings ▁are ▁most ▁often ▁used ▁for ▁liquid ▁p umps ▁and ▁prop eller ▁systems , ▁since ▁a ▁static , ▁physical ▁bar rier ▁can ▁be ▁placed ▁between ▁the ▁two ▁sh aft s ▁to ▁separate ▁the ▁fluid ▁from ▁the ▁motor ▁operating ▁in ▁air . ▁ ▁Mag net ic ▁sh aft ▁cou pl ings ▁pre clude ▁the ▁use ▁of ▁sh aft ▁se als , ▁which ▁eventually ▁wear ▁out ▁and ▁fail ▁from ▁the ▁sl iding ▁of ▁two ▁surfaces ▁against ▁each ▁another . ▁Mag net ic ▁cou pl ings ▁are ▁also ▁used ▁for ▁ease ▁of ▁maintenance ▁on ▁systems ▁that ▁typically ▁require ▁precision ▁alignment , ▁when ▁physical ▁sh aft ▁cou pl ings ▁are ▁used , ▁since ▁they ▁allow ▁a ▁greater ▁off ▁axis ▁error ▁between ▁the ▁motor ▁and ▁driven ▁sh aft . ▁ ▁App lications ▁Some ▁ ▁diver ▁prop ulsion ▁vehicles ▁and ▁rem ot ely ▁operated ▁under water ▁vehicles ▁use ▁magnetic ▁coupling ▁to ▁transfer ▁tor que ▁from ▁the ▁electric ▁motor ▁to ▁the ▁prop . ▁Mag net ic ▁g ear ing ▁is ▁also ▁being ▁expl ored ▁for ▁use ▁in ▁utility ▁scale ▁wind ▁tur b