An overhanging beam spring stator ultrasonic motor which driven by bend travelling wave was researched based on the spring stator ultrasonic motor proposed previously for its piezoelectric ceramic low relibility. The driving principle of the ultrasonic motor was analyzed theoretically; structure parameters of stator was optimized by the method of orthogonal design and finite element; the dynamic characteristics of the spring stator was analyzed based on the optimization results. The research provides theore...