roller said:
toolman - thanks for the curve -- that's pretty impressive stuff. What's changing between the 10 runs that causes differentiation? (motor/windings/voltage/temperature/ . .? ) Would be nice to know corresponding amps/efficiency along the curve . . , but I get that this is a wheel dyno.
Where do you strap on the shopvac on your bike?
Do you know what your (neo) magnet material is (S? SH? UH?) . . . 150C coils may put your mags in the danger zone. 15Nm -- what do you consider "continuous" -- 24/7? 1 hour? 1 sec?
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Miles -- like the paper describes, this method is likely valuable and useful for selecting 1 motor from a catalog of 1 manufacturer that is (ostensibly) consistent with their spec measurements/techniques/qualifications. But specs mean different things to different people, so it get's harder to apply across platforms/manufacturers. I hope for ES folks + motor suppliers/resellers will put up their independent curves, to build up a database . . .
thanks for the info roller, we changed phase amps and battery amps on a keb 10kw kelly, it seemed that above 50% setting on either didnt make any more, but the changes from 30% to 50% are what you are seeing, i video d the ca for each run and the most i saw was 12.4kw but it must be a little more than that.
yes i may need a 24s cordless leaf blower, as its smaller than a shopvac!
i dont know about the magnet grade, but ive done these temps a lot and it hasnt gained kv, but i acctually think the mags were too strong in this motor and that they are now weaker from being cooked.
continuous was for hours at 150deg c, but nothing was changing, so although its an unhealthy temp for increased copper resistance etc, i dont see it dying from it.
and yes a 500a supply will not be easy, but do you think the formula would hold when theres so much difference in tooth thickness, ie some motors have double the amount of tooth width (leaving less room for copper) but thers a good pic of this stator somewhere here and it has thin teeth and more copper?
-and its 3 turns of 23g 16 strands.