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DC motors use permanent magnets and AC use coils in both the stator and the rotor. I too am a little confused by the controllers -- I've heard that some DC motors use AC controllers.
AC are often more efficient than most DC motors, but some of the newest DC motors are better still. Powerful permanent magnets are more expensive than doing windings, but if the design can avoid the need for reduction gears, then you can regain the cost advantage, and also keep the overall efficiency higher.
I need to learn more about the controllers, and how/if they differ between DC and AC systems.
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