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AC or DC Drive for Electric Cars?
by Louis
Why does one select AC over DC drive for electric cars? I see both kinds of kits offered but I don't understand why one would choose one over the other. Hi, Louis! Ah, my favorite question! Why choose a DC drive system? Drag racing, and low-budget conversions. Why choose an AC drive system? First: An AC electric car motor gets the most range for your battery buck. Think 80 miles instead of 30, yes, even with lead acid batteries. Second: AC is better for highway driving, for a variety of reasons. That expensive controller really earns its keep on the freeway. Third: AC will drive more like your regular ICE (internal combustion engine) machine, given adequate voltage, while DC has a distinctly different torque curve (more like a golf cart). Fourth: If there are any hills in your driving range (sorry, small golf cart pun; ), you'll appreciate an AC drive system. DC motors don't excel under conditions of varying load - i.e. hills - and with your AC drive, that expensive controller again earns its keep recapturing the braking energy going downhill. Fifth: The regenerative braking. With an AC drive system, regen braking is excellent and easy. Sixth: If you want to convert a heavy vehicle, AC drive is the way to go. And finally...The major automakers overwhelmingly choose AC drive systems when they build an electric car. I suppose they might have their reasons. Regards, Lynne |
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