SANO Intelligent Servo Transformer is one kind of mini servo transformer introduced since year 2000. It is super-mini specialized servo transformer, spe-cialized to the non-match of the voltages between China electrical mesh and AC servo motor. Such mini transformer has overcome the disadvantage of the traditional transformer: heavy, heating, high energy consumption, complex installation etc, which, totally different from the industrial frequency transformer, is the ideal product for solving the power adaptor in industrial controlling field, without any pollution to the electrical mesh.