I am still working on the slip ring. There was a short somewhere in the slip ring and i couldn't find it. I worked on it for hours and in the end I decided to replace a few parts and in the process I made a better setup for the plugs. I am still waiting for some parts before I can put in together again. Hopefully it is going to work!
I bought a MRC POWER PACK 1370 transformer and that is a great improvement. It gives excellent speed control. I haven't tested it on the bigger motors under load, but I think it will be up for the challenge.
After the Christmas break I am going to integrate it all.
Kerst