How to Rewire an Electrical Motor to Generate AC Current Apr 17, 2018How to Rewire an Electrical Motor to Generate AC Current Route all wiring safely. The motor-generator will stop producing electricity if it is overloaded or used to start a motor of a similar size. Induction motor-generators can only start motors of about 1/5 to 1/10 of their own horsepower rating. AC generator (alternator) - construction and working An alternator or AC generator is an electrical machine which converts mechanical energy into alternating electric energy. They are also known as synchronous generators. The working principle of an alternator or AC generator is similar to the basic working principle of a DC generator.