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From: dbecker215@hotmail.com<BR>To: chris@chrisrobison.org<BR>Subject: RE: [ausev] High torque or High RPM?<BR>Date: Thu, 6 Dec 2007 15:49:33 -0600<BR><BR>
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My bad, my thumbs get carried away with 0's. Must be a Freudien slip of some kind :)<BR> <BR>Donovan<BR><BR>> From: eeyore@phototropia.org<BR>> To: ausev@austinev.org<BR>> Date: Thu, 6 Dec 2007 15:08:55 -0600<BR>> Subject: Re: [ausev] High torque or High RPM?<BR>> <BR>> On Thu, 2007-12-06 at 13:31 -0600, Donovan Becker wrote:<BR>> > Josh,<BR>> > <BR>> > We might be able to give you a better idea of whether or not to use a<BR>> > motorcycle or car tranny soon. I'm working with Gary K on his electric<BR>> > trike. (www.zwheelz.com for pics) We're using a 30kw AC induction<BR>> > motor with an off the shelf motorcycle tranny similar to what Harley's<BR>> > use. Our vehicle will run about 3000 lbs with 24 lead acids, and we're<BR>> > hoping to get similar performance specs to what you're looking at.<BR>> > It's conected via belt drive so we'll find out whether the tranny or<BR>> > belts will give first, or ideally not give at all. The motor at 30kw<BR>> > is a pretty good size and has regen braking, a 90000 rpm range, and<BR>> > liquid cooling so we can beat it up continuously w/o over heating:)<BR>> <BR>> Inductive AC motors lack a commutator and therefore have a torque<BR>> characteristic that's much kinder to transmissions and drivetrains.<BR>> Moderate torque and high RPM. However, if your motor is truly capable of<BR>> 90,000rpm, I'd be very impressed that you've found a transmission and<BR>> belt drive that will tolerate it! :-)<BR>> <BR>> I suspect it's closer to 9,000rpm. Some AC motors are capable of<BR>> 10-12krpm, but I haven't seen many that go higher.<BR>> <BR>> A sealed case and liquid cooling is a huge plus for AC as well, and is<BR>> very difficult to imagine on a DC motor.<BR>> <BR>> The big downside is cost. And with the Siemens systems, that high pitch<BR>> whine.<BR>> <BR>> --chris<BR>> <BR>> <BR>> <BR>> _______________________________________________<BR>> AusEV mailing list<BR>> AusEV@austinev.org<BR>> http://www.austinev.org/mailman/listinfo/ausev<BR><BR><BR>
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