Another advantage of inrunners is that you can directly cool the stator
which is where you're generating all the heat. On bigger motors (Im
talking from forktruck/golfcar motor size experience), DC armatures had a
similar problem (as outrunners). You're dumping a lot of heat into
something thats impossible to heatsink. It was a lot easier to cool the
separately excited dc stator since you can simply fin the motor housing.
AC motors, both PM and induction, can be designed so there is very little
heat in the rotor that you have to get rid of.
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