I am looking at used Sliding Table saws and will possibly be buying a 3 phase unit.

It is made by Felder and has a 7.5 hp motor on the saw. Would a 10hp rotary phase or a 10hp Digital phase converter be enough to run this saw?

I may also need to run a 5hp 3 phase Dust Collector at the same time, so if I had both running what size would I need.

Generically I guessing I'm asking what the formula or process is to size the correct phase converter?