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My understanding of regen is that it can extend your drive by at most around 10%, and that's just if you are doing stop and go traffic in the city. It has other benefits though, like almost eliminating the need for mechanical brakes. Separately excited DC motors can do regen as well as AC. You have 2 separate pwm signals. One for field A, and one for field B. I really need to learn my motor lingo. Field A can have a very puny power supply of just a few amps. If you keep field A constant, then you basically have the equivalent of a series wound DC motor. Lots of torque. I don't know how common they are though. I think that's what Damien has.
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