Pipe Motor (Brushless DC Sheet Motor)

Copper pipe radial magnet version of the brushless sheet dc motor, F=ILB or U=vLB, L = vertical length of the copper pipe sheet. Spin AA/AAA cell energy storage E=½Jw^2, J=mr^2, w=2*pi*f. Example values r=21.3mm, m=20g, J=0.0000090738, f=33.3kHz(=2000krpm), w=209440, v=4461m/s (mach 13), E=199kJ=55.3Wh, specific energy S=1.3kWh/kg when AA spin battery total mass is 40g. Energy storage rating scales in squares with rotation frequency, E(10kHz)=130Wh/kg, E(3.33kHz)=13Wh/kg. Radial acceleration a=v^2/r=w^2r, a(33.3kHz)=93M-g, a(10kHz)=8.4M-g, a(3.33kHz)=934k-g.