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ohms when choosing CC motor for windmill

Hi.

I have some little steppers from recycled old stuffs, dump diving.

A lot are 27 volts, 4 wires, but they have different ohms : 8Ω, 16Ω, etc ...

I can't figure myself the influence (or not) of this characteristic, when I'm trying to choose the best motor to use in place of a generator.

This is for a little windmill, with a little surface of wings against the wind.