Many years ago I needed to run a 10 hp 3 phase vacuum cleaner. I called up an electrician and he came over with a 25 hp rotary converter. To make a long story short, he could not get it to run. The rotary converter did not have the power to start it. It would crank up to about half speed and then stall there. You could smell the insulation burning throughout the whole shop. He then suggested a 40 hp rotary. That made no sense, all I wanted to run was a 10 hp motor, and if we can't get a 10 hp motor started why are we bringing in a 40 hp one? Plus, the price was way beyond what I had expected. I did some research and found another way to run these motors. It is called the transformer method. It works fantastic for simple motors, such as dust collectors, air compressors, pumps, fans, vacuums, grinders, etc. It doesn't have to be running before starting your motor. It saves energy and has better starting power. This allows you to run a larger motor then you possibly could with a rotary converter. It's as easy to build as a rotary converter and costs about half as much. If that was all I told you how to do, the book could be a couple of chapters. But no, I found a way to make transformers that's very unusual, but works great. I teach you how to get transformer cores at scrap metal prices, and use them to make your own transformers. I teach you how to modify commercial transformers. I have been selling my book and dvd set for about ten years and in that time I have talked to hundreds of people after they bought my literature. What I learned was in different countries people have to deal with raising the voltage to twice what they get from the power company and they have less amperage then we do in America. This is a challenge that the transformer converter can solve. In addition to the transformer converter I also show you how to hook up the automatic start relay, how to hook up capacitors for 240 volt motors and also high voltage motors, how you can use oil cooling to increase the power your transformer can supply, and how to build a powerful welding power supply and also a massive battery charger at any voltage you need. And of course I did devote a chapter on how to build and tune the rotary converter. I have spent years doing this and have watched people waste their time and money trying to solve all their three phase motor problems with an old war horse, the rotary converter. Many times they would have been much better off, time wise, money wise, and results wise, using the transformer converter. As an example I have a chapter on how you could have a business working as an adviser in this field. Using your knowledge of the different types of converters to help set people up with the right converter, for their application. As an additional benefit, being able to supply a transformer converter, you built in your down time, really sets you apart from someone offering only one solution, the rotary converter. Just as I mentioned before, the electrician wanted to sell me a 40 hp rotary converter because he had no other options. Check out the Unique3phase website and look at some videos I have done. Thanks for taking an interest in this and good luck. Doug