I can't find where I found the info I used when building mine, but all you need is the correct capacitors to both start, and run the motor, and your good. In other words you do not need a separate motor to start it.
With mine, I've got start capacitors wired in to provide the 'third leg' to get the 3 phase motor spinning initially. I did this by using a starter that momentarily makes the connection when I hit the start button, and then drops out when the button is let go. The motor is kept spinning by the two main 220V legs going to it and being maintained by a second starter that's wired to hold in when the start button is released.
I used a 10HP three phase motor for the converter, and got the other parts out of various well pump panels that had been replaced by the company Dad works for. I built it nearly two years ago, and have had absolutely no problems starting either the vertical spindle on my mill which is 5HP, or my lathe, which is also 5HP. The only thing that makes it struggle a little is the horizontal feed which takes a little more juice. In that case I simply fire up the vertical feed first and let it also act as an idler, and then start the other. Once running I can shut off the vertical motor, and do what I need to do.
Ultimately it's not rocket science. Given all the things I've seen you post about on here, added with a little research on the net (all I did), it's really easy to build one that will work for you with absolutely no problems. Too, it's a lot cheaper than going out and buying a new one where the only difference is someone else did the thinking, and wiring for you.
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