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Magnetic drives, I would imagine, are DC also and polarity dictates direction of magnetic field and therefore direction of spin also.
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They're not. Thats why DC pumps that will last more then a few weeks cost a small fortune.
About a 100 years ago there was a debate over AC or DC power. AC won because in part it makes much better motors (as well as that its much easier to make DC from AC then the other way around).