关键词: 电器工程, 双面齿, 锥形齿, 超声电机, 自支撑轴系, 谐响应分析

Abstract: The conventional onesided travelling-wave ultrasonic motor(TWUSM) needs bearing to support and oil to lubricate, does provide sufficiently high torque and power due to limited contact area between the stator and the rotor, consequently its application is limited. So, a TWUST with the two-sided coneshaped teeth and self-supported shafting was developed. Its structure was designed and its excitation mechanism was analyzed. The model, harmonic, and transient analyses of the motor stator were performed using the FEA software ANSYS. The excitation frequency was predicted precisely, the shapes of the vibration modes, the vibration amplitude and impedance versus frequency behaviors and displacement versus time curve of the tooth tip on the stator and its elliptical locus were obtained theoretically. The developed motor prototype was tested and its load characteristics were measured. The maximum stall torque of 0.48 N·m is reached which is 1.7 times as high as the conventional onesided TWUSM, and its idle speed is 86 r/min.

Key words: electrical engineering, two-sided gear, cone-shaped gear, ultrasonic motor, selfsupported shafting, harmonic analysis