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Yep, it's a MAC. Pretty sure ferrofluid would be a disaster in a geared hub motor. My reading suggests that it adds significant drag (and lost efficiency) even in direct drive motors, and geared motors have a lot more in the way of moving parts inside. And anyway, I'm not having any heat problems with 3000w fed only for brief periods. I destroyed my first bearing hitting a pothole at close to 50mph though, and have had issues with the phaserunner. It's not happy with a 5000rpm motor running at both high current and voltage, and it's going to take a lot of tuning to minimize instantaneous phase overcurrent faults. I think if I were to do it again, I might go with something else, maybe an infineon controller. Or, considering how unrealistic it is to pedal at higher speeds, maybe a direct drive motor with the phaserunner.
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