Dear Lee and Cor, thank you both for the clarification. Ben's original question deserved an answer and I popped in with a commutator which was probably way out on foul territory. I am under the impression that an AC-51 is a variable reluctance type AC Motor and I have yet to have one to fail. As for the side thrust on the bearings of the motor from the chain and sprocket or belt and pulley drive, If there is genuine concern, what if he puts a second sprocket or pulley on the motor shaft and adds an idler to the opposite side of the motor from the driveshaft and let the idler relieve the stress on the bearing from the main belt or chain leading to the tailshaft of the transmission. (Ben, autos stopped using chain or belt drives 80 years ago, I like using the 4WD transfer case with the 2::1 low range for in town and 1::1 on highway coupled with the stock 3.0::1 in the rear axle& differential. With the gearing Ben could avoid the second electric motor, and buy more batteries. But it is your decision, Ben.
Dennis Lee Miles (*[email protected] <[email protected]>)* * Founder: **EV Tech. Institute Inc.* *Phone #* *(863) 944-9913 (12 noon to 12 midnight Eastern US Time)* *Educating yourself, does not mean you were **stupid; it means, you are intelligent enough, **to know, that there is plenty left to learn!* * You Tube Video link: http://youtu.be/T-FVjMRVLss <http://youtu.be/T-FVjMRVLss> * * NEW You Tube Video link: *http://youtu. be/Pz9-TZtySh8 <http://youtu.%20be/Pz9-TZtySh8> On Wed, Aug 6, 2014 at 1:35 AM, Cor van de Water via EV <[email protected]> wrote: > Dennis, > Depends how the rotor is built, there is significant stress on it, not > just the bearings. My previous EV had a Hughes induction (AC) motor with > a 9,000 RPM redline and I believe that at that speed, the rotor surface > is going > about 300 km/h (200 MPH) in a thight 1/2 ft circle, so the centrifugal > forces on that rotor surface are enormous, at some point it will > litterally be pulled apart by the force that wants to let it fly in a > straight line instead of turning a 1/2 ft circle at a third of the speed > of sound. > > Cor van de Water > Chief Scientist > Proxim Wireless Corporation http://www.proxim.com > Email: [email protected] Private: http://www.cvandewater.info > Skype: cor_van_de_water Tel: +1 408 383 7626 > > > -----Original Message----- > From: EV [mailto:[email protected]] On Behalf Of Dennis Miles > via EV > Sent: Tuesday, August 05, 2014 7:58 PM > To: Lee Hart; Electric Vehicle Discussion List > Subject: Re: [EVDL] Hybrid Mustang: motorcycle drivetrain? > > Lee, I must be too young to have seen those, or else I did not have one > fail because they were stronger. The other question is how does it > damage > the AC motor to over speed and why does a speed limiter in the > controller/inverter cause damage as was indicated in the discussion? The > AC > motor doesn't have a commutator, or windings on the rotor so what is the > harm in driving the motor to more than 8,000 rpm? All I can conceive are > bearing stresses. > > Dennis Lee Miles > > (*[email protected] <[email protected]>)* > > * Founder: **EV Tech. Institute Inc.* > > *Phone #* *(863) 944-9913 (12 noon to 12 midnight Eastern US Time)* > > *Educating yourself, does not mean you were **stupid; it means, you are > intelligent enough, **to know, that there is plenty left to learn!* > > * You Tube Video link: http://youtu.be/T-FVjMRVLss > <http://youtu.be/T-FVjMRVLss> * > > * NEW You Tube Video link: *http://youtu. be/Pz9-TZtySh8 > <http://youtu.%20be/Pz9-TZtySh8> > > > On Tue, Aug 5, 2014 at 7:43 PM, Lee Hart via EV <[email protected]> > wrote: > > > Dennis Miles via EV wrote: > > > >> David, and others, the most fragile part, of a series DC motor, is > the > >> commutator. And that is, because the copper segments are glued to an > >> insulating core. When the current is flowing, the segments heat up > and > >> soften the glue, then they are subjecting to "lifting," away from > that > >> insulating core, and causing problems with the brushes, resulting a > need > >> for an extensive repair. But, with no (or very low) current, the glue > >> maintains its strength, and the motor can be spun to a higher RPM, > without > >> damage. > >> > > > > Relatively new DC motors are built with commutator bars that are glued > in > > place. Older and heavy-duty motors instead have "steel" commutators > that > > don't depend on glue to to hold the bars. Instead, there are steel > rings at > > each end hold in the bars. They use mica or other materials to > insulate the > > bars. This type of commutator is much stronger, and better able to > > withstand high temperatures and high RPMs. > > > > Here's one image I could quickly find: > > > > http://www.iccinternational.com/resource/vring.html > > -- > > We cannot waste time. We can only waste ourselves. > > -- George Matthew Adams > > -- > > Lee Hart's EV projects are at http://www.sunrise-ev.com/LeesEVs.htm > > > > _______________________________________________ > > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > > For EV drag racing discussion, please use NEDRA > (http://groups.yahoo.com/ > > group/NEDRA) > > > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140805/3383 > 0f7c/attachment.htm> > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > For EV drag racing discussion, please use NEDRA > (http://groups.yahoo.com/group/NEDRA) > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > For EV drag racing discussion, please use NEDRA ( > http://groups.yahoo.com/group/NEDRA) > > -------------- next part -------------- An HTML attachment was scrubbed... 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