I've tried similar things with my twin etek setup. Started with just the motors spinning. Then added the transmission. Then added the rear wheel. No one thing was a big amp drag, but they all add up. So I think all is well.
But one thing I also notice is that with the brushes removed (easy to do on the etek), the motor turns over a lot easier by hand. I'd say there's more drag due to the brushes than the bearings, etc. Don't know if you could do the same, pop the springs off of the brushes. And Yes, I've got squeaking from the brushes too. Plus realize that you're powering the series field, even with no load on the motor. Darin BadFishRacing ----- Original Message ----- From: [EMAIL PROTECTED] To: ListServ@electricmotorcycles.net Sent: Sunday, March 11, 2007 2:29 PM Subject: [ElectricMotorcycles] Motor Load and DriveLine Losses -Observations and Questions There is thread on the EVDL about what are the normal drive-line losses in a Front Wheel Drive car. It got me thinking, so I put the Ninja un the center stand and did some tests for you to comment on. Test 1 - Bike on center stand, measured motor amps, falls quickly to ~29.5 amps at about 1500 rpms. Is this normal? Test 2 - Bike on center stand, removed read disk brake, no change in motor amps consumed. So far so good. Test 3 - Bike on center stand, removed all drive line loads (e.g. no chain or rear wheel or bearing losses) 19.5 amps. This seems to be a lot just to turn over the ADC 6.7" motor? Things noted during the tests.... - I can turn the motor with my hand on the shaft with moderate effort. It doesn't turn as easy I thought. - the motor makes a small squeaking noise when (un powered by hand) turning slowly. Is this sound the brushes rubbing or do I need to suspect bearings? I don't suspect any issues, just curious. - I found that the chain was too tight and the alignment is not perfect. I have some motor mount bolts that need to be addressed to get the alignment perfect. Any thoughts of suggestions appreciated. Any other tests that I should try? Mike Bachand Denver Electric Vehicle Council (DEVC) - Colorado Chapter of the EAA 1994 Kawasaki Ninja EV ------------------------------------------------------------------------------ AOL now offers free email to everyone. Find out more about what's free from AOL at AOL.com. ------------------------------------------------------------------------------ No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.446 / Virus Database: 268.18.8/718 - Release Date: 3/11/2007 9:27 AM
