--===============0440302147== Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by pch.mit.edu id mAE0noqg028223 =20 Inductive charging looks like a pretty good point. We have made an inductive battery charger in the company. We were finally= able to deliver 90W at 1/4 inch distance with a 80-85% efficiency.=20 I don't know if anyone has done some KW scale inductive charger before. B= ut it sounds like a pretty good application for electric vehicles. But st= ill you need to raise up something to get as close as possible, otherwise= the efficiency is really bad. =20 =20 =20 =20 =20 =20 =20 > Date: Thu, 13 Nov 2008 18:42:55 +0000> From: byronjeff@clayton.edu> To:= piclist@mit.edu> Subject: Re: [TECH]:: Deka Revolt hybrid car with Stirl= ing Engine> > On Thu, Nov 13, 2008 at 12:51:29PM -0500, gardenyu wrote:> = > > > > > I'm going to take a crack at this.> > > I was told by people in= Argonne lab that nowadays people can make Lithium> > ion batteries large= enough so that they can run the vehicle for 300 miles> > on highway with= out recharging. (maybe the Tesla technology)? In such a> > system where b= atteries privide average power request, a supplementary> > sterling engin= e will be a good option.> > To run a stirling engine you need to burn som= ething. Doesn't that kind of> defeat the purpose.> > As for the 300 miles= without recharging, what exactly is the need. The vast> majority of driv= ing that is done doesn't require that type of range. The> 100+ miles per = charge that current tech has is sufficient for the vast> majority of driv= ing needs. The problem with the technolog y is the cost, not> the range. Get LiFePo4 batteries down to a reasonabl= e price, even in their> current configuration, and you'll have a winner.>= > The problem is that Lithium with a battery management system is still = about> $USD0.75/Wh. So a reasonable range battery pack (25 kWh and up) wi= ll still> run about $USD 20k and up and will need to be replaced periodic= ally.> > > > > > For example, if you forget to recharge the battery in th= e morning, the> > engine can at least carry you to a nearby "electric" st= ation.> > Nearby? Electric cars can plug in anywhere that has electricity= , and in> urban and suburban environments, that pretty much anywhere.> > = The other point is that once electric cars become commonplace then chargi= ng> will become automatic. It's pretty easy to have an inductive pad that= sits> in the driveway under the car. So simply parking it will be enough= to> charge it.> > Finally if there is wholesale change occurs, then a lo= gical extension will> be charging directl y from the roadway. Several studies on the process has> been conducted b= y the California PATH project. A summary paper can be found> here:> > htt= p://repositories.cdlib.org/cgi/viewcontent.cgi?article=3D1257&context=3Di= ts/path> > Such electrification would facilitate long range electric vehi= cle travel> and would depress the need for ultra long range battery syste= ms.> > Finally there are simple, plentiful, powerful battery technologies= that can> serve well in emergency capacities. Zinc/Air and Aluminum/Air = batteries> have even more power than lithium and are lightweight. The pro= blem is that> they are not rechargable. However, they can easily serve as= emergency power> in the case that the primary battery system fails.> > T= he fundamental problem is that everyone seems to want new transportation>= systems to function exactly like the current system. Gasoline is as clos= e> to a magic liquid fuel as one will ever find. That's why the whole> tr= ansporation economy is based upon it. But eve n though the price has> temporarily gone down, it is a finite resource. = Also the emmissions are an> issue.> > New ways of transportation will be = different than the current way. As long> as the requirements remain the s= ame (i.e. can be refuled in 5 minutes,> 400-600 mile range, etc) there's = not going to be any movement away until> the gas pumps run dry.> > BAJ> -= - > http://www.piclist.com PIC/SX FAQ & list archive> View/change your me= mbership options at> http://mailman.mit.edu/mailman/listinfo/piclist _________________________________________________________________ MSN=C8=C8=CB=D1=B0=F1=A3=AC=C3=BF=CC=EC=D7=EEIn=B5=C4=D0=C5=CF=A2=D7=CA=D1= =B6=BA=CD=C8=C8=B5=E3=C5=C5=D0=D0=C8=C3=C4=FA=D2=BB=C0=C0=CE=DE=D3=E0=A3=A1 http://top.msn.com.cn --===============0440302147== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Disposition: inline Content-Transfer-Encoding: 7bit -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist --===============0440302147==--