Transfer Function Identification of a Shaft-Driving Type Ultrasonic Actuator by OE Model
In this study,a prototype design of shaft-driving type ultrasonic motor is developed.Its driving mechanism is a mechanical vibration of metallic back-plate to generate the traveling wave propagation,which responds from converse piezoelectric effect using a single-phase AC voltage power at resonant frequency.Otherwise,from the signal point of view,the admittance transfer function through input voltage and output current is obtained to describe dynamic characteristics at operating frequency.The major feature of the ultrasonic actuator is very simple structure and small thickness,acceptable torque,and high speed,obtained with low input power about ±10 Vp-p,0.2 A at 72 kHz.The stator dynamic transfer function is identified and proved to be a transfer function characterized by practical physical properties,by acquiring signals of stator input voltage and output current at the system driving frequency by means of the OE model in system identification.A 3rd-order transfer function constructed by order reduction and DC gain compensation is almost identical to ones enumerated in literature.However,as described in this paper,retrieval of experimental signals pertaining to electromechanical energy conversion and intrinsic oscillation of a piezoelectric ceramic material surpasses the conventional way of creating a model solely in accordance with physical properties but in the absence of practical verification in terms of significance and value of physical inference and mathematical verification.
Ultrasonic actuator Transfer function Order reduction DC gain compensation.
Shann-Chyi Mou Li-Hui Yang
Department of Mechanical Engineering, Chien Hsin University of Science and Technology, Jhongli, Taiwan
国际会议
天津
英文
62-68
2012-10-16（万方平台首次上网日期，不代表论文的发表时间）