Electronic – Homemade DC generator isn’t outputting much voltage

brushed-dc-motordc motorvoltage

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I'm new to electronics and I've made a permanent magnet brushed DC generator, but when I spin it (using a drill to get high RPM) I get an output of less than 1 volt.

I've used it as a motor and it runs perfectly fine. I'm wondering if maybe it's the size of the magnets?

Best Answer

It appears in your picture that you have two magnets that are not magnetically connected with a low reluctance material: -

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Without the yoke (frame) the magnets in the picture above will not be very effective. The magnetizable material in the yoke ensures that field lines pass more effectively into the rotor.

I'm not ruling out other problems either because it's hard to tell from just a basic picture. Picture source: -

The yoke is the outer cover of the machine supporting and protecting the internal parts. It is made of low reluctance ’ material like silicon steel or cast iron, Since, it has to carry the magnetic flux i.e., to provide the closed path for the flux produced through the poles.