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Article #1776Re: Who Killed the Electric Car?
From: kevin93
Date: Sun, 18 May 2008 22:35
Date: Sun, 18 May 2008 22:35
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On May 18, 3:00 pm, "Tim Williams" <tmoran...@charter.net> wrote: > Do they use permanent magnet, electric field or AC (induction) motors? <...> They are permanent magnet AC synchronous 3-phase motors - so they don't need excitation. They use a DC rail of up to 500V (650V in other Toyota models) feeding three half bridges to drive the motor pretty much as you describe. They are not set into reverse to regenerate though, the PWM duty-cycle is controlled to give boost so that current flows into the battery rather than out. They can regenerate with a road-speed as low as 7mph, while allowing over 100mph before they run out of control because the BEMF exceeds the rail voltage. kevin
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