I read that one of the innovations in the PM motors Tesla is using in the m odel 3 is the Halbach array they use for the magnets. Seems this greatly i ncreases the magnetic field on one side of the magnets for little downside. The trick is being able to glue powerful magnets in an arrangement where they strongly repel one another. The guy talking about them said when they first saw one of these they put it in a vice to hit it with a hammer and t he pieces flew apart. Lol
Seems they glue four magnets together to make a single array. Not sure how these Halbach arrays are arranged in the motor. Seems the Tesla motor is much more powerful, lighter and cheaper to make than the motors used in the BMW i3 or the Chevy Bolt. The weights differ by about 10% but there was a bit larger difference in price with the Tesla model 3 motor being the top dog across the board.
Rick C.
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