Title :
Cascaded control scheme for speed variable ultrasonic drives
Author :
Maas, J. ; Grotstollen, H.
Author_Institution :
Inst. of Power Electron. & Electr. Drives, Paderborn Univ., Germany
Abstract :
A novel control scheme for the most advanced traveling wave ultrasonic motor fed by a resonant power converter is presented and verified by measurements on a prototype drive. Based on a detailed simulation model, the drive´s characteristics are investigated. Using this model, pull-out phenomenon can be avoided by means of a tailored control unit. Thus, the motor´s performance is improved by utilizing the hysteresis bandwidth. As the simulated speed-torque curves are verified by measurements, a general control scheme for traveling wave ultrasonic drives is suggested. Equipped with a flexible test set-up, the realized cascaded drive control is outlined. The proposed control scheme is predestined for speed variable ultrasonic drives ensuring optimal torque utilization and minimized losses under consideration of the inherent amplitude threshold for torque generation
Keywords :
cascade control; control system analysis; control system synthesis; machine control; machine testing; machine theory; motor drives; ultrasonic motors; variable speed drives; velocity control; amplitude threshold; cascaded control scheme; control design; control simulation; control testing; drive measurements; hysteresis bandwidth; minimized losses; optimal torque utilization; pull-out phenomenon; resonant power converter; simulation model; speed-torque curves; torque generation; variable speed ultrasonic motor drives; Bandwidth; Hysteresis motors; Optimal control; Power measurement; Prototypes; Resonance; Testing; Torque control; Ultrasonic variables measurement; Velocity measurement;
Conference_Titel :
Industry Applications Conference, 1996. Thirty-First IAS Annual Meeting, IAS '96., Conference Record of the 1996 IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-3544-9
DOI :
10.1109/IAS.1996.557064
