An Analysis of the Resonance Characteristics of a Traveling Wave Type Ultrasonic Motor by Applying a Normal Force and Input Voltage

Oh, Jae Sub; Yuk, Hyung-Sang; Lim, Jong-Nam; Lim, Kee-Joe; Park, Dae-Hee; Kim, Hyun-Hoo

doi:10.1080/00150190902848156

Cited by 5 publications

(2 citation statements)

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“…This is due to ultrasonic motors' features, which include excellent properties like high torque at low speed, high torque to weight ratio and no electromagnetic noise [6][7][8]. Pre-pressure is a non-negligible factor in all types of ultrasonic motors, for example traveling wave ultrasonic motors (TRUMs) [9], linear ultrasonic motors [10], 2-DOF ultrasonic motors [11], hybrid DOF ultrasonic motors [12] and so on. Among them, the studies of TRUMs are most representative.…”

Section: Introductionmentioning

confidence: 99%

“…However, these results were not verified by any further Sensors 2020, 20, 2096 2 of 15 experimental results. Afterwards, both the resonant frequency and anti-resonant frequency under diverse pre-pressures were tested in Oh's experiments [9]. He proved that the resonant frequency and anti-resonant frequency have a positive correlation with the preload force no matter whether the pressure is larger or smaller.…”

Section: Introductionmentioning

confidence: 99%

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Pre-Pressure Optimization for Ultrasonic Motors Based on Multi-Sensor Fusion

Chen

Zheng

Ding

2020

Sensors

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This paper investigates the pre-pressure’s influence on the key performance of a traveling wave ultrasonic motor (TRUM) using simulations and experimental tests. An analytical model accompanied with power dissipation is built, and an electric cylinder is first adopted in regulating the pre-pressure rapidly, flexibly and accurately. Both results provide several new features for exploring the function of pre-pressure. It turns out that the proportion of driving zone within the contact region declines as the pre-pressure increases, while a lower power dissipation and slower temperature rise can be achieved when the driving zones and the braking zones are in balance. Moreover, the shrinking speed fluctuations with the increasing pre-pressures are verified by the periodic-varying axial pressure. Finally, stalling torque, maximum efficiency, temperature rise and speed variance are all integrated to form a novel optimization criterion, which achieves a slower temperature rise and lower stationary error between 260 and 320 N. The practical speed control errors demonstrate that the proportion of residual error declines from 2.88% to 0.75% when the pre-pressure is changed from 150 to 300 N, which serves as one of the pieces of evidence of the criterion’s effectiveness.

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