Sorry to bump a year old thread, but i figured this would be the place to add some info.
I couldn't figure out how to open mine... i unspoked mine and tried to use a 3 prong gear/axle puller on it and part of the spoke flange chipped off from all the force..
Tried the puller on the other axle and that did not work..
I figured mine was threaded on somehow, requiring a proprietary tool of some sort, since all other motors have pulled apart that way. But i was wrong.
So apparently the key here is smacking on the spoke flanges with a hammer ... hit one edge twice, hit the opposite edge twice, and so on, until the case finally separates.
And the magnets are so damn strong that you can't use the typical 'bash the axle on the ground' trick to get the stator to pop out of the magnet housing. That definitely requires the 3 prong gear/axle puller to pull off.
Anyway, i have a working stator ( the magnet ring was screwed up because a magnet came unglued ) w/controller for sale if anyone is interested.