You are correct many commercial breweries use centrifuges to clarify their beers, FourPure in the UK are one that comes immediately to mind.
regarding your questions:
1)Is there any products for home use?
You can use filters but there is not really such a thing as a home centrifuge. You could get hold of a lab bench centrifuge, but without sub-gram accurate scales you could end up with a very dangerous walking centrifuge. You can pick these up secondhand.
2)Can you easily make one?
No, not easily for a liquid solid separation centrifuge such as an Alfa Laval. They have to be incredibly finely balanced or they either shake themselves to pieces which can be catastrophic, or they just jam and break.
If you just want sediment out the suspended yeast in a bottle then a hand centrifuge could be made to hasten clearing in bottles. [https://www.youtube.com/watch?v=uzb12_BR-8s] but securing beer bottles may be problematic.