> ..there's no turning permanent magnets "off. " Their magnetic fields never change, so when they're not being powered by energy in the stator winding, they're

> ..there's no turning permanent magnets "off. " Their magnetic fields never change, so when they're not being powered by energy in the stator winding, they're generating energy in those windings, which creates drag. This is why some EVs powered by multiple motors either use a clutch to decouple and idle a permanent-magnet motor when it's not needed, or they fit one asynchronous AC induction motor (which suffers no such losses) and one permanent-magnet motor. This part is really interesting from a physics energy (thermodynamics?) standpoint.