Development of Wobble Motor.

This paper deals with some results of development of the electrostatic microrotational motor : the so-called wobble motor. A rotor of the wobble motor revolves inside a stator with rotation on its own axis. The rotational speed on its own axis is less than the revolutional speed. Then, if the rotational speed can be taken out, this motor develops low-speed, high-torque characteristics. The size of the developed motor is 9 mm in outer diameter and 23 mm in length. The generated static torque of two rotors of different sizes has been analyzed by the boundary element method. The experiment for confirmation of the analyzed results has been carried out, and satisfactory results have been obtained. On the basis of these confirmed theoretical results, the optimal design factors are explained.