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《Journal of Xi'an Jiaotong University》 2018-09
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An L-Shaped Plate Type Linear Ultrasonic Motor with Large Thrusts

ZHANG Bailiang;YAO Zhiyuan;LIU Zhen;LI Xiaoniu;State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics and Astronautics;  
To improve the mechanical output performance of the ultrasonic motor in flat space,a plate type linear ultrasonic motor is proposed.The motor is composed of a linear guide and an Lshaped stator which is constructed by two mutually perpendicular rectangular plate vibrators.The symmetric and antisymmetric modes of stator based on the bending vibration are utilized,and each mode is excited individually to move the linear guide in one direction.The influence of a slot in the front end cover on amplitudes of driving foot is analyzed,and a slotted front end cover is adopted to enlarge the amplitudes.Then the effect of bolt clamping method of vibrator on the prestress in piezoelectric ceramics is discussed.In the view of the flat structure and large transverse dimension of the vibrator,a bolt is used on both sides of the center of cross section to fasten the vibrator and to improve the value and uniformity of the prestress.Prototypes are fabricated and experimentally investigated.Their typical output performance is that the maximum no-load speed reaches 435 mm/s and maximum thrust reaches 100 N,achieving a thrust-to-weight ratio of 54.6.
【Fund】: 国家自然科学基金资助项目(51275229);; 国家重大科学仪器设备开发专项(2012YQ100225);; 南京航空航天大学研究生创新基地(实验室)开放基金资助项目(kfjj20170114)
【CateGory Index】: TM359.9
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