Speed control of ultrasonic motors using fuzzy neural network

Control of multiple ultrasonic motors with robust parameter design

“…It is difficult to describe mathematically an USM because its complex energy conversion and time-vary parameters from increasing temperature and changing operating conditions such as driving frequency, source voltage and load torque. In the papers about control of single USM, several advanced control theories available within the research community have been applied to control one USM, such as neural network [5,6], fuzzy neural network [7,8], MRAC [9], and so on. Although these theories are effective, the industry may be hesitate to apply these theories.…”

Fuzzy auto-tuning PID control of multiple joint robot driven by ultrasonic motors

“…Similar to the structure of the above speed control system, Bal et al have presented a servo position control for TRUM [7]. Senjyu et al have realized speed control of ultrasonic motors with fuzzy neural network that could approximate the nonlinear input-output mapping [8]. Using adaptive backstepping control and dead-zone compensation with fuzzy inference, Senjyu et al have proposed a position control scheme for the USMs, which performs accurate positioning of the drive system [9].…”

Wear Characteristics of Metallic Counterparts under Elliptical-Locus Ultrasonic Vibration

“…Besides, dynamic contact of the driving tip and the slider, especially for standing-wave motors, is intermittent and impacting [9,10], resulting in severe wear and material loss over traveling wave motors [11]. In addition, special requirements 2 of 16 for the drive signals of different vibrators are necessary for sufficient impedance matching [12], and have not yet been standardized; this problem would be enhanced by the dynamic contact process, with a consequence of the erratic output performance of ultrasonic motor induced by the variable friction force. Last but not least, ultrasonic motors make a concession to the service life of the contact interface, thereafter the output mechanical power is small and their working efficiency needs improve further.…”