行波型旋转超声电机, 组合结构, 大转矩, 高能量密度

In order to improve the output performance, two novel TRUSMs (traveling wave rotary ultrasonic motor) with combined structures were designed and implemented. One was the TRUSM with two stators and single rotor, the other was the TRUSM with two stators and two rotors. Based on the structural characteristics, the mechanism that the stator/rotor contact state affected the output performance of these TRUSMs was qualitatively analyzed. In the comparative experiments，it was tested that the TRUSMs with combined structures had incomparable features to the single-stator-rotor TRUSMs. Experimental results indicate that the structural combination is an effective way to greatly improve the output performance, and the stator/rotor contact states are very important for the TRUSM performance. 

traveling wave rotary ultrasonic motor, combined structure, large torque, high energy density