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Hm, in-wheel motors are commonly used in some industrial processes. Those should be reliable or they would not be used like that.
As for car use, it is a bit of a chicken-egg problem. There are no cars that use hub motors yet, so there's no large scale production, so the few motors produced have not yet been tested to iron out all the flaws.
So what are these flaws? Mainly water intrusion, which affects the Hall sensors.
If that gets fixed there's a bright future for hub motors though, with better and lighter magnets and magnet arranging patterns emerging, allowing for lighter and more compact motors, on top of the full per-wheel control and simplicity hub motors provide.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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