Just to follow up on this: I spoke with Bill at HPEVS this afternoon. I still don't think he'd be willing to sign off on the project considering the uncharted territory I'm heading into, but he was also rather more encouraging with this latest round of changes.
The AC-51s use 6207-2RS bearings; my main job is to research their side loading capacity. However, Bill says there're a number of side-loaded AC-35s out there, and that he thinks I'm probably okay -- though, of course, I need to confirm that. If anybody can suggest a good way to put some numbers to that, I'd appreciate it. My instincts for gearing were probably spot-on, for once. That ~5.7:1 is likely at a good sweet spot, with maximum power at freeway speeds and maximum RPM at maximum sane speeds (or perhaps a bit beyond). He says it's okay to spin the motors faster than 8000 RPM so long as it's not the controller that's sending the current to the motors that's doing the spinning. And, if I ever *did* want to do anything significant at higher-than-not-quite-sane speeds and also needed the electric motors to help the V8 at said higher-than-sane speeds, I could always change the pulleys. So, once I confirm that I'm not going to be putting undue side loads on the motor bearings, I should be good to move out of the "Can I?" phase to actual planning. So...I'll probably shut up for a while, and then come back with a complete plan and a request that all y'all rip it to shreds, if you don't mind. Thanks, b& On Aug 2, 2014, at 7:56 AM, Ben Goren <b...@trumpetpower.com> wrote: > So, as I mentioned in that previous post on air conditioning, I was at my > shade tree mechanic's yesterday; he was fixing a fuel leak on my '68 > Westfalia. And he had what I'm thinking may be the best idea yet for > connecting the electric motors in the Mustang. > > Basically, mount a gear (two gears, in this case) between the transmission > and the U-joint, mount the motors under the seats, and connect each to the > gear on the driveshaft with a chain. The quick research I've done since then > makes me think a motorcycle's belt drive would likely be much preferable to a > chain drive. > > This would solve a *lot* of geometry problems, *and* it would allow some > flexibility in using different gearing for the electric motors than the V8. > For example, if I have the math right, with a 3:1 rear end (factory stock for > this particular car that might still be in there) and standard 65- and > 34-tooth pulleys, the electric motors would see a 5.7:1 ratio. They'd already > be over 1000 RPM in 15 MPH school zones, but they still wouldn't reach 8000 > RPM until above 100 MPH. 65 MPH would be at 5000 RPM, which is peak power for > the AC-51. > > My biggest concern would be the sideways torque on the motor shaft. Is that a > valid concern? HPEVS markets the AC-35 for use in motorcycles, and I'd think > that the AC-51 shouldn't be less capable in that regard. > > I imagine there might be some challenge in machining something that would > allow the mounting of the pulleys to the driveshaft...but I also know that > there're machinists who're miracle workers who would be glad to do something > like this...for a price.... > > So...the question I'm sure y'all're tired of hearing from me: am I crazy? > > Thanks again, > > b& -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 801 bytes Desc: Message signed with OpenPGP using GPGMail URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140804/d10a5bb6/attachment.pgp> _______________________________________________ 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)
