Title :
Dynamic modeling and analysis of a bimodal ultrasonic motor
Author :
Meng-Shiun Tsai ; Lee, Cheng-Hsueh ; Hwang, Sheng-Hung
Author_Institution :
Dept. of Mech. Eng., Nat. Chung Cheng Univ., Ming-Hsiung, Taiwan
fDate :
3/1/2003 12:00:00 AM
Abstract :
A dynamic model that includes four subsystems is developed to analyze the fundamental characteristics of a bimodal ultrasonic motor. The first subsystem is the driving circuit designed for the motor to achieve bidirectional motion. The stator is modeled as a Timoshenko beam, and the assumed mode energy method is used to obtain the dynamic equations. The normal interface force is represented by an elastic spring existing in between the tip of the stator and the moving platform. The interface forces are coupled into the dynamic formulations of the stator and the moving platform. The behavior of the force transmission between the stator and the moving platform are analyzed using the developed model. Transient and steady-state responses of the system are obtained by numerical simulation, and the results are validated by experiments. Furthermore, the existing of a nonlinear deadzone is predicted analytically, and the causes of this nonlinearity are clarified.
Keywords :
bridge circuits; dynamic response; dynamics; equivalent circuits; machine theory; motor drives; stators; transient response; ultrasonic motors; Timoshenko beam; assumed mode energy method; bidirectional motion; bimodal US motor; bimodal ultrasonic motor; driving circuit; dynamic equations; dynamic model; elastic spring; force transmission analyzed; moving platform; nonlinear deadzone prediction; normal interface force; stator; steady-state response; transient response; Councils; Couplings; Electromagnetic interference; Equations; Equivalent circuits; Numerical simulation; Rotors; Springs; Stators; Steady-state;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
DOI :
10.1109/TUFFC.2003.1193618