Abstract
As a new type of driver, linear ultrasonic motor (LUSM) is widely used in the high-tech field because of its low speed, high thrust, low noise, and no electromagnetic interference. However, as an actuator used in microdevices, most of the existing LUSMs are large in size and not compact in structure. In order to overcome these limitations, a new structure of linear ultrasonic motor’s stator is developed in this paper. The stator is similar to a tuning fork structure, which is divided into three parts: two driving feet, two driving legs, and the driving body. By using the first-order longitudinal vibration mode of the whole stator and the unique partial second-order bending vibration mode of the driving legs to achieve vibration mode degeneracy, a mode hybrid linear ultrasonic motor that is easy to miniaturize is proposed. Its working principle is analyzed. The dynamic analysis of the stator is carried out by using finite element software. The structure dimension of the stator and the driving frequency under the working mode are determined. At the same time, the feasibility of driving feet synthesizing elliptical motion is verified theoretically and experimentally. In addition, the LUSM test setup is built. The effects of driving frequency and Vpp on stator stall force and average velocity are studied. The results show that the maximum stall force can reach 99 mN, and the average velocity of the motor is 88.67 mm/s with Vpp = 320 V and driving frequency 80.2 kHz. The proposed LUSM is appropriate for use in occasions with quick return characteristics, like the controlling valve or nozzle of the printer. The research results provide guidance for the stator design of the linear ultrasonic motor.
Highlights
As a new type of actuator, the ultrasonic motor has a promising future in the fields of minimally invasive medicine, image acquisition, and mobile devices
Shunsuke and Tomoaki [24] made many exploratory studies on microlinear ultrasonic motors driven by the same frequency and proposed a thin square hollow out-ofplane vibration hybrid mode LUSM [25, 26], which is expected to be used in mobile phone microcamera shots, whereas the stator fixation and actuator preloading of the motor are somewhat complicated
A mode hybrid linear ultrasonic motor is proposed. e movement direction of LUSM is consistent with the maximum dimension direction of the stator
Summary
As a new type of actuator, the ultrasonic motor has a promising future in the fields of minimally invasive medicine, image acquisition, and mobile devices. Takano et al [17], Shi and Zhao [18], Wan and Hu [19], and Wang et al [20] designed single-drive foot longitudinal-bending hybrid LUSMs with different structures, respectively, with a maximum thrust of 3.2 N [18] Such motors only generate thrust force on one side of the stator. Shunsuke and Tomoaki [24] made many exploratory studies on microlinear ultrasonic motors driven by the same frequency and proposed a thin square hollow out-ofplane vibration hybrid mode LUSM [25, 26], which is expected to be used in mobile phone microcamera shots, whereas the stator fixation and actuator preloading of the motor are somewhat complicated.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
