High resolution miniaturized stepper ultrasonic motor using differential composite motion.
Experiments show that there is a limited minimum stepped angle in ultrasonic motors (USM). The research on the minimum angle of stepper USM with 15 mm in diameter and wobbling mode is being carried out. This paper presents a novel way to decrease the minimum stepped angle of USM based on the principle of differential composite motion (DCM), i.e. clockwise and counterclockwise rotation. The prototype was fabricated and experiments proved that this method is useful and also keeps a high torque for a large stepped angle. The stator of the prototype is steel, and rotor is fiberglass, antifriction material or steel. The prototype can operate well over 150 h with a 5 kHz wide frequency band. The minimum stepped angle is 46" using a coventional method while 12" using DCM method proposed in this paper.
Department of Materials Science and Engineering, State Key Lab of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, PR China. chuxiangcheng@tsinghua.edu.cn
Xiangcheng
X
Chu
Zengping
Z
Xing
Longtu
L
Li
Zhilun
Z
Gui
D011211:Electric Power Supplies; D008904:Miniaturization; D014465:Ultrasonics