Caught a summer cold this week, so I was out for a while, but was back in the shop today and machined
out the bearing cap clearance for the new bearing. Spin's real nice now.
When I put it all back together, I left out all the cores so I could get a feel for how much resistance the
rotors would have with just the aluminum stator plates alone. Spinning it by hand, I'd have to say, it was
not very much resistance. It would spin for one or two turns, and didn't have all that much drag to it.
Then I put it on the test stand that way, and spun it up to 295 rpm for five minutes. The cold start temperature
was 84.2 degrees, and after 5 min. it climbed to 88.3.
So, it doesn't appear to be much of a problem at the moment, and certainly won't keep the motor from running,
but will have to be addressed at some point down the road, with non ferrous plates. All heat is unwanted.
Next, I wound a couple of cores with the new 14 awg solid wire, and installed a couple of multi strand cores in
the stator assembly, so I could get a comparison test between the four of them.
After spinning them up in the test stand at 280 rpm, I got a reading of .347v (347. mv) and , .322v on the two
solid strand coils, and .349v / .324v on the multi strand coils.
Not enough difference to worry about, which is a good thing, and clears the way for winding all the coils with 14 awg.
They certainly look more robust, and don't seem to have a problem with shorts.
If I average the coil outputs to .330v each, and multiply it times seven, for each phase set, I get an estimated 2.310v
at 280 rpm., which would seem to be an improvement over the last test I did, at the end page 13.
Maybe theres hope,.. but I'm not going to get too excited yet. :wink:
I'll wind up all the coils, and give it another try.