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USM (Ultrasonic Motor) is widely used in the aerospace, medical, micro-electromechanical systems (MEMS) for its distinguished feature including low speed, high torque, electromagnetic compatibility, and self-locking function etc. In this paper, we propose a small U-type linear motor stator structure, with the use of finite element analysis to select the structural parameters of the stator. Determine the final structural parameters of the stator to make the two operating mode frequencies which are identified by the modal assurance criteria as close as possible. The purpose of optimizing the stator structure is achieved. According to the experiment results, the motor has the virtues of high power efficiency and operation stability.

As several linear ultrasonic motors worked together could increase the thrust, the research on linear ultrasonic motors parallel technology received attention. Preliminary study suggested that motor output performances were non-linear superposition relationship in parallel condition, but the research was not in-depth. In this paper, the linear ultrasonic motors output characteristics in parallel condition were researched. Designed a parallel rotating platform composed by three U-shape linear ultrasonic motors, and researched the relationship of output performances between single motor and the parallel rotating platform in different driving modes and conditions. Compared the advantages and disadvantages of different driving ways and established motion mechanics model of parallel rotating platform. The experiments showed that the experimental results agreed well with the theoretical analyses.

A new-style linear ultrasonic motor is presented in this paper. It takes a brief structure with ceramics pasted on its surface, realizing the integrated design of the stator. The second-rank longitudinal vibration of the stator and the ceramics on the driving foot generate alternating force together. This driving style doesn't depend on the elliptical motion of the nodes on the driving foot. The theoretical model of this kind of motor is given and its analyzing solution is obtained in the paper. Comparing the result to the solution of the finite element methodand the experimental statistics, it is demonstrated that this theoretical model and its analyzing solution are accurate and high-efficiency.