Senlimain3KWandbelowsmallpowermotorproducts,thereisnospecialrequirementsofthegeneraldefaulttousecastaluminumbody,butthereareindividualcustomersrequiretheuseofcastiron,thefollowingSenlimotorsmallseriesonthesinglecastaluminumbodyproblemforyoutodotheanswer,whereistheadvantageofaluminumshelltorquemotor?