Vibration Analysis and Characteristics of Ultrasonic Motor Using a Longitudinal-torsional Convertor With Oblique Slots

A research on a new type of ultrasonic motor is carried out by using a longitudinal-torsional convertor with Oblique Slots.And a method to realize the positive and negative rotation of the ultrasonic motor is presented by using mode conversion by changing the working frequency.Modal analysis and harmonic response to the stator is carried out by using general finite element analytical software ANSYS.The simulation result reveals the principle that the motor realizes positive and negative rotation under different working frequencies,and several main structure parameters which influence the positive and negative rotation of the motor.The ultrasonic motor using mode conversion,which is designed by the analysis results,can realize positive and negative rotation.The positive rotation frequency is 53 150 Hz,the no-load speed is 852 r /min and the hold torque is 0.2 N·m.The negative rotation frequency is 60 345 Hz,the no-load speed is 100 r /min and the hold torque is 0.04 N·m.