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There are so many variables as everyone has stated here winfield. With AC, you can eliminate the transmission and reduce those losses. It all depends on how it is setup. Any motor out there can be made to generate torque at whatever rpm you want by rewinding it.
Are you looking to build the most efficient EV possible? Is this just an exercise on paper? If its the former, sooooo many other variables come into play like rolling resistance and aerodynamics. These are infinitely more important than a percent or two of drive system efficiency.
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