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Probably a design/engineering issue. Typically they require a very small air gap between the rotor and stator. So you end up with bearing wear and thermal expansion issues, which could be resolved by better design and materials. Downside is they get bigger and heavier which increases the unsprung weight, a bad juju consideration.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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