Design and analysis of a disc-type of traveling wave ultrasonic motor with fixing inner side

Using B₁₃ vibrating mode and fixing inner side of stator, a new disc-type of traveling wave ultrasonic motor (TWUSM) was designed. Finite element method was introduced to simulate the vibrating mode of stator, considering structure factors like outer diameter of stator, numbers and height of stator teeth. The variation curves of related vibration parameters were calculated, such as amplitude of stator teeth, resonant frequency, vibrating speed elliptical locus of particles in contact surface and so on. Furthermore, a prototype of 40 disc-type of TWUSM was fabricated. And the driving characteristics were investigated. The results showed that this kind of TWUSM had a simple structure, light weight, high rotational speed, and a certain torque as well.