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Right Size AC Motor for an Electric Car
by Steve
Is there a simple way (formula) to estimate the correct size for a 3-phase AC induction motor for an EV conversion given the weight of the vehicle? Steve Hi, Steve! Yes. The new edition of "Build Your Own Electric Vehicle" by Seth Leitman says to figure on 6-8 hp (continuous) per thousand pounds total vehicle weight (include passengers and cargo), more if you want to drive on the freeway. Your voltage matters, too. Since horsepower increases with voltage, a 72v system with exactly the same motor will have less horsepower than a 144v system. Regards, Lynne
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