Mendocino Motor

by KG1610 Feb 12, 2015
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Hey there, I was hoping to find what length of copper wire was required for the 300 turn coils i.e. 15 m or something else? Looking forward to your feedback.

Hi Dirka86,

So with this build it was all guess work.
the second Mendocino Rotor I Made ( need to complete the base) is far better and i tried to calculate all I could understand.

with the Second build
i started with the Resistance of the Solar cell which is 120 Ohm Voltage / Amps = Resistance
then Measure one loop e.g 95mm
Then i Checked the Specifications for the size of wire i Had 0.28mm
this showed that the resistance Ohm p/m = 0.25 Ohm

then work out how long you need to get to the total resistance.

i stopped there - i tried to calculate the torque but this was a bit over my head.

i have added a picture to the new Mendocino Rotor of my white board - while i was going through this check out

see last pic

hope that helps

DIY Mendocino Motor
by KG1610

Hello KG1610

Thanks for the response and fot the tips. I guess I will get a big roll of magnet wire and take it from there. Thanks also for sharing your notes that you made on the white board, much appreciated.

I will post an update when I've managed to make mine but I think it will only be in a few months possibly, still waiting on my solar cells from Ebay and that can take an eternity.


The series solar panel connections provide the commutation for the rotor coil; only one panel is generating at a time, when it is exposed to the light source. / mco

i have made a new Mendocino Motor - http://www.thingiverse.com/thing:1092841

DIY Mendocino Motor
by KG1610

if I had to guess , that motor can make maybe up to 10 watts ?

so the purpose of this is to have free energy provided by solar panels that spin and keep the motor going, so it's a direct solar panel drive, saving the external connections if u had a solar system powering a regular motor ....

In my opinion >This motor does not really have a function.
Maybe it could produce more power by driving a generator.
But You could just lay all the solar panels flat and collect the energy that way.

This build was a test for me to see if i understand enough to actually make it work.

Nice design. Don't let your soldering troubles discourage you. Some people struggle all their lives with ugly/troublesome soldering. (I think it is matter of steadiness of hands and experience) How this thing is wired is still a bit ambiguous, but I'll look around and see what reveals itself. I see there are multiple photocells, some more illuminated than others and I could understand how that could crate a switching effect as the device turns. Very cool. :-)