How to Build Permanent Magnet Generator from AC ( induction) motor or car alternator? DIY

Description of how to build Permanent Magnet Generator at home cheaply, simply to wind ( or water) turbine. The base for all three phase (240/400V or 400/690V, 265/440 or 440/790 USA) inexpensive induction ( AC) motor, or car alternator. Completed Permanent Magnet Generator power same as it was before motor power. Just the speed will be higher 25% or less. Efficiency is the same as factory generators. No starting torque. An example and generalizing you can build Permanent Magnet Generator is 0.25 kW - up to 100 kW, Any experience, knowledge which is gained after more than 50 such generators build.