Sorry I was not clear, my fans force air into the outer openings of the Perm 132. The Brush housing and slots in the PMG has basically Zero airflow. And I did a check with the laser temperature sensor and the brushes don't appear to get anywhere as hot as the rotor and motor housing itself. So if you were looking at the motor from the side, and the brush cover was on the left, the shroud forces air in on the left and it vents from the slots in the right. I did not make a comparison with the laser sensor but if I drove it medium hard I could make if pretty hot to the touch but still able to place my hand on it without burning, AFTER the fan was installed the motor is fairly warm to the touch after medium hard use. I will try to check this Saturday with the laser sensor, supposed to be high 60s still. Keep in mind the highest temp I read off of the rotor thru the slots in the case was posted a while back, I am thinking 254 f, this was 90+ degree day. Hope this helps.
Check your motor to see if there is any real airflow thru the brush housing before you apply air to it, again I think the coils (copper plates on PM) and housing will have the most heat problem. Cheers, Jeff On 11/7/07, lyle sloan <[EMAIL PROTECTED]> wrote: > > Going on that squirrel cage theme, I dont know if the > angle of the brushes will help or hinder the air flow, > but another option not in your diagrams is via the > side of the brush housing (black arrows) and then out > the normal way of the motor. > > http://img.photobucket.com/albums/v424/slodown27/AnotherFanflow.jpg > > > --- Jeffrey Blamey wrote: > > > I used 6 small mini-pancake fans on a shroud I made > > from plastic ceiling > > light trim pieces I found at home Depot. The inside > > diameter of the hole > > matched the brush cover of the PMG. I will try to > > post the pictures so you > > can view it. I felt pushing the cool(er) air into > > the unit would be better > > that pulling is, you have a bit more control. I have > > found the motor to run > > cooler. I would start the fan(s) as soon as the bike > > is turned on so heat > > cannot build up as easily as turning it on by a > > thermo switch... if you wait > > until it is hot the fan will be less effective. Fans > > generally run on very > > little current. My DC to DC converter is 200 watts > > and runs the stock > > lights, signals, and the six fans no problem. > > > > I have heard from someone here that the squirrel > > cage blowers move more air, > > my situation with the location of the fans and motor > > in the chassis > > precluded the use of a squirrel fan. > > > > I am reminded of the early electric cars from the > > 70s that used the starter > > motor/generator from a jet engine, it had a circular > > coupler that allowed an > > air source to force air into the motor in one > > location and an air output at > > the . > > > > If I was to approach the problem I would try to > > establish the air flow > > possibilities into the motor and out of the motor > > and make sure the motor > > case would not allow the air to escape without > > traversing the whole motor > > and pulling the heat out of the rotor. So that may > > mean sealing some air > > vents mid motor. Hope this makes sense to you. > > > > Cheers, > > Jeff > > 84 Honda VF Franken'ceptor > > > > On 11/7/07, dale henderson > > <[EMAIL PROTECTED]> wrote: > > > > > > i have attached a word doc for this question > > [sorry for supporting > > > microsoft, i can reformat it if need be] > > > > > > i want to know what is the best way to cool a > > motor with forced air. the > > > main two issues is whether to pull or push and > > where to pull or push > > > > > > > > > > > > harry > > > > > > Albuquerque, NM > > > > > http://geocities.com/hendersonmotorcycles/blog.html > > > http://www.austinev.org/evalbum/1221 > > > http://geocities.com/solarcookingman > > > > > > __________________________________________________ > > > Do You Yahoo!? > > > Tired of spam? Yahoo! Mail has the best spam > > protection around > > > http://mail.yahoo.com > > > > > > > > > > > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam protection around > http://mail.yahoo.com > >
