Speed tracking servo control system incorporating traveling-wave-type ultrasonic motor and feasible evaluations

A variety of ultrasonic motors (USMs) have attracted special interest as a new type of actuator in servo motion control systems. For practical applications, the speed servo control system incorporating the ultrasonic motor developed in Japan has some special unique features. However, this system has several significant problems, such as the inherent speed ripple characteristics, the speed regulation characteristics under the condition of applied disturbance load torque, and the speed tracking characteristics. In order to solve these practical problems, some control schemes of ultrasonic-actuated motor systems have been proposed and discussed theoretically, which include fuzzy reasoning control, adaptive control, repetitive learning control, and neural-network-based learning control. However, it is considered that these control strategies mentioned above have not been sufficiently substantiated from a feasible experimental point of view. This paper presents a newly proposed precise speed tracking servo control system using the compact traveling-wave-type ultrasonic motor. Its proposed control scheme is composed of both the driving frequency control loop with the variable-gain strategy and the applied voltage control loop with the speed ripple reduction strategy of the USM. The improved speed characteristics realized by this proposed control system are demonstrated and evaluated in experiments.

[1]  Horst Grotstollen,et al.  Cascaded control scheme for speed variable ultrasonic drives , 1996, IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting.

[2]  M. Kurosawa,et al.  Hybrid transducer type ultrasonic motor , 1991, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[3]  Tomonobu SENJYU,et al.  Precise Speed Control of Ultrasonic Motors by Repetitive Control with Fuzzy Reasoning , 1995 .

[4]  Atsuo Kawamura,et al.  Analysis of Plimary-on-Slider type Ultrasonic Piezoelectric Actuators, and Experiments on Multi-Degree-of Motion Freedom Plane Actuator , 1994 .

[5]  S. Ueha,et al.  Ultrasonic motors : theory and applications , 1993 .

[6]  Tomonobu Senjyu,et al.  Adjustable speed control of ultrasonic motors by adaptive control , 1994 .

[7]  Tomonobu Senjyu,et al.  Quick and precise position control of ultrasonic motors with dual mode control , 1995, Proceedings of 1995 International Conference on Power Electronics and Drive Systems. PEDS 95.

[8]  Mutsuo Nakaoka,et al.  Adaptive control‐based high‐performance drive system implementation of traveling‐wave‐type ultrasonic motor , 1992 .

[9]  Y. Izuno,et al.  New fuzzy reasoning-based high-performance speed/position servo control schemes incorporating ultrasonic motor , 1992 .

[10]  Kazuo Kato,et al.  Robust resonant frequency tracking control for ultrasonic‐motor drive , 1997 .

[11]  In-Su Cha,et al.  A Study of Phase difference control for Uitrasonic Motor drive using Fuzzy Controller. , 1995 .

[12]  M. Nakaoka,et al.  Load-adaptive frequency tracking control implementation of two-phase resonant inverter for ultrasonic motor , 1990, 21st Annual IEEE Conference on Power Electronics Specialists.

[13]  Tomonobu Senjyu,et al.  Speed control of ultrasonic motors using neural network , 1996, Proceedings of the 1996 IEEE IECON. 22nd International Conference on Industrial Electronics, Control, and Instrumentation.

[14]  Toshiiku Sashida,et al.  An Introduction to Ultrasonic Motors , 1994 .