Kingfish
100 MW
Greetings.
For the past few weeks and months I’ve been whittling away like a carver on a piece of wood perfecting my motor designs. At some point I realized that it was necessary to create a baseline model for comparison, hence the development of a Nine Continent 2806 hub motor in FEMM.
Disclaimer: I have zero intention of reproducing this motor other than to craft a simulation; it is just a curious engineering study and that is all
Basic facts:
Much borrows from Doing the Math thread, except the model has been slightly altered to fit the present MtB system.
View attachment RF_Magnetics-9C-2806.zip
I would be much obliged
Perplexed, KF
For the past few weeks and months I’ve been whittling away like a carver on a piece of wood perfecting my motor designs. At some point I realized that it was necessary to create a baseline model for comparison, hence the development of a Nine Continent 2806 hub motor in FEMM.
Disclaimer: I have zero intention of reproducing this motor other than to craft a simulation; it is just a curious engineering study and that is all
Basic facts:
Much borrows from Doing the Math thread, except the model has been slightly altered to fit the present MtB system.
- Wheel = 26-inch diameter = 0.6604 m diameter = 2.0747 m circumference
Speed = 30 mph = 48.28 kmh = 40.6 rads/s (̉ۡ) = 387.8 rpm = 6.464 rps
Power = 2 hp = 1491.4 W (actual power measured climbing a slight grade)
Ä = P/É => 36.72 Nm
F = Ä / r => 111.2 N @ circumference
- 46 magnets / 23 poles, 51 teeth with suggested winding scheme of:
- AaABbBbcCcaAabBbBCcCAaAabBbcCcaAaABbBCcCcaAabBbcCcC
- Magnets are approximately 27 x 13 x 3 mm, with presumed strength is 45SH
- Back Iron is presumed to be SST 430 x 9.5 mm thick.
- Laminations used in the model are US Steel Type 2-S 0.018 inch thickness; however the actual thickness is closer to 0.20 mm.
- Windings are set to 2 mm diameter 10 strands of 0.6 diameter copper, x 6 turns.
- r1 x F1 = r2 x F2 => F2 = (r1 x F1) / r2
F2 = ((0.6604/2) x 111.2) / 0.1 = 367.2 Nm
f = 6.464 rps * 23 pole-pairs = 148.7 Hz
View attachment RF_Magnetics-9C-2806.zip
I would be much obliged
Perplexed, KF