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This paper outlined the modal analysis of a Double Rotor Bar-type Rotary Traveling Wave Ultrasonic Motor (DBTRUM) with single degree of freedom (SDOF). The first bending vibration mode generated from the inverse piezoelectric effect produces traveling wave in the stator, the traveling wave generated in the stator is converted to rotary motion on the two rotors by the use of friction layer between the rotor and the stator surfaces. The system was first designed theoretically after which it was then simulated with finite element method software (ANSYS) to obtain the modal frequency and mode shape.

Modal analysis of a stator of Double Rotor Traveling Wave Rotary Ultrasonic Motor (DTRUM) (Single Degree of Freedom)