[ausev] FW: High torque or High RPM?

[Donovan Becker]

From: dbecker215 at hotmail.comTo: chris at chrisrobison.orgSubject: RE: [ausev] High torque or High RPM?Date: Thu, 6 Dec 2007 15:49:33 -0600


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

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