A novel piezoelectric rotary motor (PRM) on the basis of synchronized switching control was designed, fabricated, and tested to achieve high speed, high efficiency, and high torque. The new motor mainly consists of a vibrator working in the resonance state as the driving element of the PRM and a clutch working in the quasi-static state to control the shaft for unidirectional rotation. The finite element method software COMSOL Multiphysics 5.4 was used to design the structure of the motor and determine the feasibility of the design mechanism of the PRM. Moreover, an experimental setup was built to validate the working principles and evaluate the performance of the PRM. The prototype motor outputted a no-load speed of 7.21 rpm and a maximum torque of 54.4 N mm at a vibrator driving voltage of 120 Vp-p and a clutch driving voltage of 200 Vp-p. The motor achieved a net efficiency of 15.6% under the preload torque of 3 N mm. The average stepping angle of the motor with no-load was 0.068°, when the voltages applied to the clutch and the vibrator were 200 Vp-p and 120 Vp-p, respectively, with the frequency of 512 Hz.

中文翻译：

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基于同步切换控制的新型压电旋转电机

设计、制造和测试了一种基于同步开关控制的新型压电旋转电机（PRM），以实现高速、高效率和高扭矩。新型电机主要由一个工作在共振状态的振动器作为PRM的驱动元件和一个工作在准静态状态下控制轴单向旋转的离合器。采用有限元法软件COMSOL Multiphysics 5.4设计电机结构，确定PRM设计机构的可行性。此外，还建立了一个实验装置来验证工作原理并评估 PRM 的性能。原型电机在 120 Vp-p 的振动器驱动电压和 200 Vp-p 的离合器驱动电压下输出 7.21 rpm 的空载速度和 54.4 N mm 的最大扭矩。该电机在 3 N mm 的预载扭矩下实现了 15.6% 的净效率。当施加到离合器和振动器的电压分别为 200 Vp-p 和 120 Vp-p，频率为 512 Hz 时，电机空载的平均步进角为 0.068°。