I converted a similar motor (3 HP in my case). You can see the process on
www.sparweb.ca.
That said... I don't think a VAWT and a motor conversion are a good match, especially that one. I don't know how big a VAWT you have or want to build, but in a sense it doesn't matter. The VAWT wants to turn at a couple hundred RPM, less and less as you make it bigger and bigger. But a motor conversion works best when it runs a little on the fast side, even for a HAWT. It's a bad speed match.
Start-up for VAWT turbines is problematic, so don't go complicating that with an iron-cored generator whose magnets have a "holding torque" to overcome before turning, or gearing which robs a constant amount of torque no matter how fast the VAWT turns.
Stick with the axial generator you have, I think, as long as you are experimenting with a VAWT.
One day that you want to try a project involving a HAWT, that motor will be a great candidate.
Good luck.
