Need some help with building a simple generator

[RayRay1132]

I bough a couple of these little steam turbines (https://www.stirlingkit.com/products/mini-steam-engine-high-speed-turbine-model-diy-project-part-science-toy), and I would like to make a 12 volt dc generator. (I just need some advice on what motor/motor type to use.) What would be the best way to do this, using a brushed or brushless dc motor? I can also probably build a gear reduction unit to get the right amount of rpms depending on which generator motor I choose.

Thanks in advance -Ray, KD2JID

 

[augustinetez]

Why not just buy the generator from the same place? https://www.stirlingkit.com/collect...t-belt-pulley-belt-kit-for-toyan-engine-model

 

[danadak]

Old car alternator -

Regards, Dana.

 

[RayRay1132]

Old car alternator -

Regards, Dana.

I don't think my little steam turbine would have enough power to turn the alternator, I could be wrong though.

 

[Nigel Goodwin]

I don't think my little steam turbine would have enough power to turn the alternator, I could be wrong though.

I wouldn't have thought so, and you would need substantial gearing down as well. Try it with a small DC motor for a start, and see how it works.

 

[RayRay1132]

I wouldn't have thought so, and you would need substantial gearing down as well. Try it with a small DC motor for a start, and see how it works.

Doesn’t the alternator also need to have a constantly powered exciter coil?

 

[danadak]

Self excited -

Regards, Dana.

 

[Nigel Goodwin]

Doesn’t the alternator also need to have a constantly powered exciter coil?

I would have thought that's the least of your issues

There should be enough residual magnetism to make them self excited, but for a small system do you want to waste some of the energy you're producing driving an electro-magnet?.

 

[RayRay1132]

I would have thought that's the least of your issues

There should be enough residual magnetism to make them self excited, but for a small system do you want to waste some of the energy you're producing driving an electro-magnet?.

I'm figuring I can maybe squeeze 5-10 watts out of it to charge a battery hopefully.

 

[Nigel Goodwin]

I'm figuring I can maybe squeeze 5-10 watts out of it to charge a battery hopefully.

Which makes a car alternator a poor choice - as the electromagnet will take more than that.

 

[danadak]

Self excited and other topics -




Regards, Dana.