Modal analysis and proof of a novel ultrasonic motor. (20th April 2007) - Juang, Puu-An
In this paper, a novel disc-type Ultrasonic Motor (UM) stator is investigated. The stator has an asymmetrical structure (120°–90°–150° support boundary configuration) on its surface. It is mainly focused on description of the disc-type UM structure and operation principle from a published patent. Then according to the patent's modal analysis and test and adding our laser vibrometer measurement of mode motion and wave propagation concept, the asymmetrical simple-support boundary configuration for an adaptive mechanism will be able to be proven. The relationship between contact point (rotor location) and Clockwise (CW) and Counter-Clockwise (CCW) rotation and the relationship between frequency and CW and CCW rotation will also be proven by finite element mode interaction together with real inspection. The driving circuit and measured characteristics for he motor system are also discussed.