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AREV
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Platinum
Re: DC Bus Voltage
AREV   8/2/2013 1:54:44 PM
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This articel sounds like the cubic inch battles of the 60s.(Watch the disney movie Dumbo from the 40s and watch the drunk clown scene.) Sunco was kept in business since the Covettes required the 260 blend . . . . I lost count of the volatge on thedifferent cars. This means that battery makers cannot standardize. I'd like discussion on the safety factor. I have hears or the Pintos w/ fork truck batteriies having a short and the entire car tourched in seconds from a short(wrench dropped). Are we going to wait until one death from these vehicle w/ no concern to isolate the power from the rest of the vehicle? With this much electrical power they may be the next vehicle of choise for terrorists. Just like bigger planes became bombs on 9-11. Less weight. Less power. More safety.

 

Charles Murray
User Rank
Blogger
Re: DC Bus Voltage
Charles Murray   8/1/2013 7:37:10 PM
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Thanks for that info, TJ. A few years ago, we wrote about how EV drag racers first tried to use smaller motors and lower voltages, and how they evolved. You might enjoy it:

http://www.designnews.com/document.asp?doc_id=228440

Charles Murray
User Rank
Blogger
Re: Let's evolve
Charles Murray   8/1/2013 6:44:44 PM
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Essentially, Rob, you're asking how much more all-electric range can you get by employing a higher-voltage architecture? Higher-voltage architectures and higher-voltage batteries are in general better at capturing regenerative braking energy, which does get you some extra electric range. But putting a number on it is going to be tough. I'll try to get a rough estimate for you, but it will vary from vehicle to vehicle, since they have different electrical architectures. Great question.

Rob Spiegel
User Rank
Blogger
Re: Let's evolve
Rob Spiegel   8/1/2013 11:04:33 AM
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Hey Chuck, how does the greater voltage affect how long the car can go before it needs to switch to a fuel motor?

TJ McDermott
User Rank
Blogger
DC Bus Voltage
TJ McDermott   8/1/2013 11:03:28 AM
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The voltages noted in the article match the DC bus voltage one would find in an industrial Variable Frequency Drive.  Using just the converter portion of such a drive would permit the use of regular 220V AC motors on the 300-360 voltages, and 460V AC motors for those in the 650V bus range.

naperlou
User Rank
Blogger
Let's evolve
naperlou   8/1/2013 10:24:03 AM
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Cap'n, this is an interesting trend.  The 48V systems are an interesting bridge.  As more functions are powered by electricity provided by batteries, the load on the engine is lessened.  This allows smaller (more fuel efficient) engines to power the vehicle.  Charging the batteries using regenerative braking captures energy that was unused before.  Thanks for the article.

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