HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
<<  <  Page 2/4  >  >>
Francois Racicot
User Rank
Iron
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
Iron
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
(Video) NASA's Modular Robotic Vehicle (MRV) is an EV inspired by manned rovers used for space exploration.
Comedian John Oliver recently did a segment on patent trolls, offering a hiliarious take on a serious issue plaguing US industries.
United Launch Alliance will fly 3D-printed flight hardeware parts on its rockets starting next year with the Atlas V. The company's Vulcan next-gen launch vehicle will have more than 100 production parts made with 3D printing. The main driver? Parts consolidation and 57% lower production costs.
The new small-form-factor EZ-BLE PRoC (Programmable Radio on Chip) module is a derivative of the existing PRoC BLE Programmable Radio-on-Chip solution. The EZ-BLE PRoC module integrates the programmability and ARM Cortex-M0 core of the PRoC BLE, two crystals, an onboard chip antenna, a metal shield, and passive components.
The engineers and inventors of the post WWII period turned their attention to advancements in electronics, communication, and entertainment. Breakthrough inventions range from LEGOs and computer gaming to the integrated circuit and Ethernet -- a range of advancements that have little in common except they changed our lives.
More:Blogs|News
Design News Webinar Series
3/31/2015 11:00 a.m. California / 2:00 p.m. New York
2/25/2015 11:00 a.m. California / 2:00 p.m. New York
12/11/2014 8:00 a.m. California / 11:00 a.m. New York
5/7/2015 11:00 a.m. California / 2:00 p.m. New York
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
May 4 - 8, Designing Low Power Systems using Battery and Energy Harvesting Energy Sources
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6 |  7


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.
Last Archived Class
Sponsored by Proto Labs
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2015 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service