Hi everyone,

I decided to measure the efficiency of my Lindemann motor, so I bought some spring scales and did some crude measurements WITHOUT a wheel, by using only the 10mm shaft.
Here is my results:
Springscale1 = 350g
Springscale2 = 900g
RPM = 52 * 60
Vin = 43v
Iin = 0.7A
Shaft diameter = 10mm

P_in = Vin * Iin = 43 * 0.7 = 30.1
P_out = [(.9 - .35) * 9.8 ] *3.14* 0.01 * 52 = 8.8 W

Eff = 8.8/30.1 = 29%

Now considering about 50% recovery, the total efficiency becomes 29% + 50% = 79%.

I will take my motor more under load as I mount a wheel to it to see how high the efficiency goes up, I suppose that the efficiency of my motor can go up to 40%, when operating at around 2200 RPM

Also consider that my motor can have around 50% more Iron on its rotor and the air-gap of it is around 0.4mm, which can be taken down to 0.1mm or even less. And I am sure designing a Lindemann motor which can operate at higher efficiencies must not be a problem.

Now Jetijs, why is your measurements with you motor this low? It doesn't make sense. hope to see better efficiencies with your motor.

I'll do more measurements and post here!

Elias