Title :
Contact model of a ring-type traveling wave ultrasonic motor
Author :
Chunrong Jiang ; Stutts, D.S. ; MinQiang Hu ; Long Jin
Author_Institution :
Sch. of Electr. Eng., Southeast Univ., Nanjing, China
Abstract :
Traveling wave ultrasonic motors are driven by frictional force in the contact interface between the stator and the rotor. The operational characteristics of ultrasonic motors are determined by the contact mechanics. A quasi-analytical contact model of a ring-type traveling wave ultrasonic motor applied to the Canon autofocus lens drive system is presented here. First, the circumferential contact length and the contact pressure between the stator and the rotor are calculated using finite element analysis (FEA). Next, the tangential motion of the contact interface is calculated using a closed-form analytical method. The stick-slip behavior at the contact interface is taken into account, and the tangential stress and stick-slip distributions are obtained. Good correspondence between the theoretical and experimentally measured torque-speed characteristics is observed.
Keywords :
electrical contacts; finite element analysis; lenses; mechanical contact; optical focusing; slip (asynchronous machines); ultrasonic motors; Canon autofocus lens drive system; FEA; circumferential contact length model; closed-form analytical method; contact pressure model; finite element analysis; frictional force; mechanical contact interface; quasianalytical contact model; ring-type traveling wave ultrasonic motor; rotor; stator; stick-slip distribution; tangential motion; tangential stress; torque-speed measurement characteristics; Acoustics; Finite element methods; Friction; Rotors; Stators; Stress; Torque; Analytical method; contact model; finite element analysis; ultrasonic motor;
Conference_Titel :
Electrical Machines and Systems (ICEMS), 2012 15th International Conference on
Conference_Location :
Sapporo
Print_ISBN :
978-1-4673-2327-7
