A new disc-type ultrasonic motor

A new approach to establish a design rule for a new disc-type ultrasonic mo tor (LEMUM) is proposed. In this design rule, an elastic model of lateral e lliptical motion induced by exciting piezoelectric ceramics embedded on an elastic metal disc is setup to estimate the frictional driving force betwee n the rotor and stator of the ultrasonic motor. Furthermore, we evaluate th e coupled interaction between mechanical vibration and electrical excitatio n by electrical equivalent circuit analysis. For the confirmation of the pr oposed design rule, we measure the characteristics of the new disc-type ult rasonic motor. As a consequence, the proposed design rule is very adaptive for disc-type ultrasonic motor. (C) 2001 Elsevier Science B.V. All rights r eserved.