A Nut-type Ultrasonic Motor and Its Application on Focus System
This article reports a screw driving polyhedron linear ultrasonic motor (USM) of a nut type. It consists of a stator of a threaded metal nut bonded piezoelectric plates and a rotor with external thread. The piezoelectric plates are bonded to the flat surface on the outside of the nut. A traveling wave in plane is stimulated on the stator when a harmonic electric signal is applied on the piezoelectric plates. The traveling wave drives the rotor to rotate and the threads transform the rotation into a linear motion. The lens could be fixed in the rotor and stator to obtain the auto focus and zoom and to realize the integrated design of focus system. This structure would omit retarder and directly drive to obtain a high accuracy of positioning and it is shockproof. The experiment data for a nut-type USM of M7 are obtained, when the applied voltages are 20-40 Vp-p and the working frequency 17 KHz for the second mode, the consumed power is 0.25 W, the moving speed is 0.5-1 mm/s in shaft direction, the driving force is about 5 g, and the response time less than 10 ms. A mini AF cellular phone module (8.5×8.5×5.9mm3) driven by this motor has been made. The image resolution of 3-5Mp has been obtained in the module prototypes of the cellular phone.
Tieying Zhou Jun Zhang Yu Chen Cunyue Lu Deyong Fu Xiaoping Hu
Department of Physics,Tsinghua University,Beijing 100084,China Boly Media Communications (Shen Zhen),Ltd.,Shen Zhen 518031,China
国际会议
Progress in Electromagnetics Research Symposium 2009(2009年电磁学研究新进展学术研讨会)(PIERS 2009)
北京
英文
914-920
2009-03-23（万方平台首次上网日期，不代表论文的发表时间）