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Micro-scale hydropower generator

by senorjp Feb 13, 2015
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I think the axis which is printed on the paddlewheel will snap very easily under load.

If you have a CNC machine that has "step" LEDs, you might notice that the lights flash when you move an axis manually - even with the power disconnected. This is because the steppers are generating power. A bipolar stepper creates 4-phase AC, so you would need to rectify that power somehow (e.g. http://www.solarheatengines.com/wp-content/uploads/2011/02/stepper-motor-rectifier-schematic.jpg)

I kind of picked 10 W out of the air. I want to let people know this IS NOT ENOUGH POWER TO POWER YOUR HOUSE. But, I have a NEMA 17 at around 6 Ohms/phase and when I spin the shaft with my drill I see around 10 W coming out. If you have adequate head (water pressure) and flow, you should be able to spin the motor at this speed and generate similar power.

Kinda nice! but.. How do you know it would generate 10W (in ideal conditions of course)?

Also, didn't know steppers work the same as other "motors" in reverse. You learn something new everyday :)

Nice idea, will keep on watching your progress. I think you do not need so many screws. Maybe some clips will do the job.