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Article #1768Re: Who Killed the Electric Car?
From: kevin93
Date: Sun, 18 May 2008 19:50
Date: Sun, 18 May 2008 19:50
35 lines
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3303 bytes
On May 18, 9:58 am, JosephKK <quiettechb...@yahoo.com> wrote: > On Sat, 17 May 2008 18:58:49 -0700 (PDT), kevin93 <..> > >This is done to maximize efficiency since the mechanical transmission > >has an efficiency of 95% or more but the electrical losses through two > >motor/generators are about 20%. > > That is way past remarkably crappy motor and generator efficiencies. > Both are typically each 95 to 98 percent efficient. Hell the antique > "Molly Long Legs" topped 99%. <...> I don't know about those you mention but the published peak efficiency of the ones in the Prius (including the inverter) are about 93%, put two in series and the losses to convert from mechanical energy back to mechanical energy when operating at peak efficiency would be about 15% - for other operating conditions they can be a lot worse, hence my 20% number. AC Propulsion (www.acpropulsion.com) only claim 91% from battery to shaft for their system with 86% with a "road load" (implying an average under normal usage). That is even lower than the Toyota figure. When considering regenerative efficiency the numbers get even worse - the battery may only have a 70% efficiency giving only a 50% overall energy recovery efficiency. Undoubtedly the efficiency could be improved but would add weight and cost - Toyota and Honda are the only manufacturers with real-world experience of producing this class of machines in million unit quantities so presumably these designs represent their view of the optimum compromise for this application kevin
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