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Francois Racicot
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Silver
Re: Gear box in electric car?? Really?
Francois Racicot   4/17/2013 9:45:12 AM
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Thanks for this explanation, William.

Elizabeth M
User Rank
Blogger
Re: Electric hot rods
Elizabeth M   4/17/2013 8:30:55 AM
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You're probably right, Battar, but I like to have a more optimistic view and hope that by making these type of cars before there is demand for them, somehow the demand eventually will be created. I hope these cars will be so good that those people who still have 200k+ gas guzzling cars will eventually give them up and go EV or hybrid.

far911
User Rank
Silver
Re: Electric Sports Car
far911   4/17/2013 5:00:35 AM
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You have a good point j-allen. The main problem with gas engines is that they drain a lot of fuel in the city limits when the traffic is at its peak. Electric cars can help in this regard with their limited performance capabilities since nobody will be needing a superfast electric car when they're stuck in traffic and moving at a snail's pace. 

William K.
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Platinum
Re: Gear box in electric car?? Really?
William K.   4/16/2013 9:56:56 PM
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Charles, a series-wound DC brush type motor would be a very good motor for a dragster because the torque is greatest at zero speed. The challenge there is that the current draw is greatest also. The other challenge is the range of speeds available with a given motor design. The big problem is that as the speed increases the back EMF also rises, which reduces the current, and thus the power. So to keep accellerating the supply voltage needs to keep increasing. Thus the need for gear shifting, unless the car finishes the quatrter mile befor the motor torque starts to fall off.

Charles Murray
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Blogger
Re: Gear box in electric car?? Really?
Charles Murray   4/16/2013 6:37:41 PM
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I'm going to study those curves, William K. I had presumed it was more about the familiar feel of a traditional sports car, but now I'll have to check.

Charles Murray
User Rank
Blogger
Re: Electric Sports Car
Charles Murray   4/16/2013 6:35:44 PM
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I agree with everything you say, J-Allen. But remember, they're only building 999 of these cars. I don't think they see a big demand for this, but there will be enthusiasts who want it.

MVRS
User Rank
Iron
Re: Electric Sports Car
MVRS   4/16/2013 5:18:21 PM
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There are a fair number of them.  Just look around on the web.

William K.
User Rank
Platinum
Re: Gear box in electric car?? Really?
William K.   4/16/2013 5:12:30 PM
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The motor type is described as "AC Synchronous", which is a type of motor that has a definite best operation spread of speeds. The DC series type of motor is quite different in it's speed-torque curve. So for most efficient operation different gear ratios will be quite beneficial. Study the curves and you will understand why that is.

Francois Racicot
User Rank
Silver
Gear box in electric car?? Really?
Francois Racicot   4/16/2013 4:49:56 PM
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Not sure I understand the need for a gearbox in an electric car, unless you need to "feel" like a combustion engine car...  Or is it because they are using very small motors that could not sustain both high accelerations and top speeds ?

Rob Spiegel
User Rank
Blogger
Re: Odd bird car
Rob Spiegel   4/16/2013 4:18:57 PM
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Those are pretty good EPA numbers, Chuck. I wonder if the Porsche EV will also have decent numbers. Maybe Porsche's EV will help that automaker meet its CAFE needs.

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