You may want to look at a simple solution like a freewheel, used on bicycles so you can stop pedaling and wheels still turn. Adapting it could be an issue. The use of a jack shaft and mounting a one way (pawl type) clutch on that shaft would allow greater flexibility in find a shaft size match then match up the sprockets ID to the shaft.
I know John Bidwell used a freewheel on a electric cross-bike (sort of a mountain bike on steroids) I think it had a 36 volt motor and could get up to 45 mph(?). Don't know the durability. If John sees this he may want to comment. For Dale: What caused the PMG to lock up, did the clips come loose? Did you have any type of fan on the motor to control the heat build-up? The PMG is just so massive (despite its size) from a motor frame aspect once it heats up losing the heat without a fan is a matter of time resting. I am still working on my radial cooling fan assembly - what is holding it up mostly is different events that I am going to prevent breaking the machine apart to proceed. Meanwhile I am purposely not hot-footing it (just takes me longer to get to 60mph - I have gone 13 miles 55-60 mmph to Boulder, CO). Look for my bike to be in the next Real Goods catalog coming out in September, about a 1/4 page plus two photos... half a million catalog drop! Also there is a solar powered electric scooter in this month's Home Power magazine. EMCs are getting a lot of attention, not just by hobbyists. Jeff 84 Honda VF Zero [Franken'Ceptor] -----Original Message----- >From: john fisher <[EMAIL PROTECTED]> >Sent: Jul 27, 2007 3:55 PM >To: ElectricMotorcycles <[email protected]> >Subject: Re: [ElectricMotorcycles] PM lock-up failure > >this may be wild overkill, but it just occurred to me that the >Rekluse clutch would solve this problem, IF it fits your tranny. >http://www.cyclebuy.com/shopping/z-start/z_start_hon.htm >( no recommendation for cyclebuy site, they just came up first in a google >search.) > >If you don't have a cush drive, it would save wear on the tranny and sprockets >too. > >just an idea.... > >BTW you guys aren't making me want to buy a PM motor. > >JF > >dale henderson wrote: >> does any have any experience with a PM [etek] failing [locking up] at >> high speed on a direct drive bike? i'm just worried that if i'm doing >> 65mph and the rear tire locks up things could be bad! >> >> i had a PMG132 lock up but i was only doing 15mph at the time but it >> left a nice skid mark. if you were going faster would there be enough >> force to break the motor free so it would spin and not cause my life to >> flash before my eyes? >> >
