I am building a motor based on this article;
http://www.mojaladja.com/upload/elmotor ... achine.pdf
Not long ago I was set on a Emrax 207 with IP64 protection rating for my prototype supercross bike. I ordered a motor (I think) from
Roman but never really got acknowledged for the order. Email response is up to 10 days and my questions and concerns didn't get handled
to my satisfaction. I decided to move on.
After reading and understanding the Yasa presentation article several times I realized the motor size they are analyzing is the same
diameter and power I am looking for. I decided to build a motor similar to the one in the article.
I have lot's of designing to do on Solidworks but have made some progress.
I have magnets, 11 gage square motor wire and Somaloy machinable core material coming.
http://www.magnet4less.com/product_info ... ts_id=1188
The magnets are .6 inches longer on the inside than the Yasa and I decided to go to 14 magnets instead of 10. The only magnets I could
find were 1/4" or 1/2" thickness instead of .394" or 10 mm. I have considered 2 of the 1/4" one on top of the other to cut down on eddy
current loss but the extra magnet would start .31" away from the core face at the closest and I am not sure if it is worth it. I may want
more flywheel mass to somewhat 'tame' the torque and magnet material would at least contribute something as opposed to more backing
plate while adding even more torque. Who knows.
Finding the machinable core material was a godsend. The size I am ordering is 80 mm diameter x 40 mm tall. Perfect.
The stator area will be water cooled. The cores and all wiring will be coated in epoxy so no direct contact with liquid. The magnets
and backing plate areas will be air cooled. Somehow I will pipe clean cold air through those areas.
I am exploring the idea of running the motor at 0 degrees C or as cold as possible. The magnets are stronger and the copper has less
resistance the colder they are. Suck the air through a pile of dry ice? Yes, I am a nut. I know it.
I am only going to have enough battery for 6 minutes, the length of a supercross heat race. I don't want to cook the magnets, so a dry
ice chamber to draw the air through is being pondered.
I have a Rinehart PM100DX that I picked up on Ebay. I had the factory test it and it is all good. It weighs 20 lbs and I wish it was half that.