HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
<<  <  Page 2/4  >  >>
Francois Racicot
User Rank
Silver
Re: Gear box in electric car?? Really?
Francois Racicot   4/17/2013 9:45:12 AM
NO RATINGS
Thanks for this explanation, William.

Elizabeth M
User Rank
Blogger
Re: Electric hot rods
Elizabeth M   4/17/2013 8:30:55 AM
NO RATINGS
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
NO RATINGS
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.
User Rank
Platinum
Re: Gear box in electric car?? Really?
William K.   4/16/2013 9:56:56 PM
NO RATINGS
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
User Rank
Blogger
Re: Gear box in electric car?? Really?
Charles Murray   4/16/2013 6:37:41 PM
NO RATINGS
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
NO RATINGS
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
NO RATINGS
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
NO RATINGS
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
NO RATINGS
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
NO RATINGS
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.

<<  <  Page 2/4  >  >>


Partner Zone
Latest Analysis
The popularity of Pokemon Go may be break open a new rush of augmented reality products.
Engineers in Australia have discovered a mechanism that could allow for the design of new composite materials for light harvesting and optoelectronics.
Here's a blast from the Gadget Freak past. Check out these gadgets, from telescope warming to keyboards on your fingers
A new method of modeling how they are created with chemical vapor deposition (CVD) could reduce the cost of carbon nanostructures used for for research and commercial applications, including advanced sensors and batteries.
BMW has already incorporated more than 10,000 3D-printed parts in the Rolls-Royce Phantom and intends to expand the use of 3D printing in its cars even more in the future. Meanwhile, Daimler has started using additive manufacturing for producing spare parts in Mercedes-Benz Trucks.
More:Blogs|News
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Jul 11 - 15, Embedded System Design Techniques™ - Debugging Real-time Embedded Software – Hands on
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6 |  7 | 8 | 9 | 10


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Technology Marketplace

Copyright © 2016 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service