Study on the Ring Type Stator Design Technique for a Traveling Wave Rotary Type Ultrasonic Motor

Oh, Jae Sub; Yuk, Hyung-Sang; Lim, Kee-Joe

doi:10.7567/jjap.51.09md13

Cited by 8 publications

(9 citation statements)

References 15 publications

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“…To facilitate the analysis, the composite stator ring is expanded into an equal-straight beam in this paper, as shown in Figure 1b. Because the back of the stator ring is affixed with piezoelectric ceramics, the stator ring is a composite beam, as shown in Figure 1c, and the distance from the upper surface of the composite beam to the neutral layer is as follows [20]:…”

Section: Equivalent Model and Statormentioning

confidence: 99%

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Research on Low-Speed Driving Model of Ultrasonic Motor Based on Beat Traveling Wave Theory

et al. 2021

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This paper proposes a driving method, the superimposed pulse driving method, that can make an ultrasonic motor run at a low speed. Although this method solves the periodic oscillation of speed in a traditional low-speed driving motor, it still has a small periodic fluctuation, which affects the stability of the speed. To reduce the fluctuation rate of the motor speed, the structure model and driving model of the motor are established, based on the theory of a beat traveling wave, and the motion characteristics of the particle point are analyzed in this paper. The simulation curve of the motor speed is obtained according to the stator and rotor contact model and the transfer model. The research shows that the driving method introduced in this paper causes the stator surface to generate a traveling beat wave, and the driving end of the stator generates an intermittent reciprocating vibration and drives the rotor rotation, which is the mechanism of low-speed operation when the driving method is used to drive the motor, as well as the reason for the periodic fluctuation of the motor speed. To improve the speed stability, this paper controlled the output performance of the motor by changing the two control variables—prepressure and frequency difference—and concluded that the variation trend of the average speed and speed volatility were consistent with the variation trend of the motor’s average speed determinant and the speed volatility determinant, respectively, which is verified by the velocity measurement experiment and the vibration measurement experiment. These insights lay the theoretical foundation for the velocity adjustment and stability optimization and, finally, the application of the new driving method is prospected.

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Section: Equivalent Model and Statormentioning

confidence: 99%

“…Substitute Equation (20) into Equation ( 11) to obtain the vertical displacement of the particle point at the wave peak:…”

Section: Motion Characteristics Of Particle Point H Of the Stator Wave Crestmentioning

confidence: 99%

Research on Low-Speed Driving Model of Ultrasonic Motor Based on Beat Traveling Wave Theory

et al. 2021

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“…By optimizing the geometry of the stator and the piezoelectric ceramic, the performance of the stator vibration is improved. 9–13 One of the other methods is to improve the efficiency of the contact at the interface of the motor. Due to the nonlinearity of the contact, the rotation of the rotor is difficult to predict.…”

Section: Introductionmentioning

confidence: 99%

Rotor optimization for the improvement of ultrasonic motor performance

Pan

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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The rotor deformation of an ultrasonic motor is an important factor affecting its performance. However, little research focuses on the relationship between the rotor deformation and motor performance. This paper provides an approach to improve the ultrasonic motor's output properties by changing the rotor's size from the view of proper rotor deformation and better stress distribution on the interface. First, a thin shell structure is introduced to study the deformation of the rotor. A finite element model of the motor is built in COMSOL Multiphysics software for the contact analysis of the stress distribution. Then, the optimized ranges of parameters are determined by simulation. Frictional experiments are conducted to verify the feasibility of the rotor under the optimized size. Finally, the performance experiments of a stator corresponding to different sizes of rotor are carried out. The experimental results show that the speed, the power and the efficiency of the optimized rotor are all increase. These results prove the effectivity of the new approach to improving the performance of the ultrasonic motor.

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“…The ring-type traveling wave RPAs are the most classic and successful one for the rotary driving (Dong et al, 2008; Oh et al, 2012; Shi and Liu, 2011; Ting et al, 2007), which have been used in the camera auto-focus system of Canon and the Yutu lunar rover of China. For example, Li et al (2007) proposed a novel ring-type traveling wave RPA with double-face teeth; their prototype achieved a maximum torque of 0.5 N m and a no-load speed of 76 r/min under a working frequency of 21.59 kHz.…”

Section: Introductionmentioning

confidence: 99%

A novel piezoelectric actuator with two operating modes

Liu

Shi

Yan

et al. 2017

Journal of Intelligent Material Systems and Structures

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A novel piezoelectric actuator with two operating modes is proposed and tested in this work, whose unique feature is that it has different mechanical output performances under two bending resonance frequencies. The proposed actuator is fabricated by bonded eight pieces of lead zirconate titanate ceramic plates on an aluminum alloy beam symmetrically. When the ceramic plates are excited by signals with resonance frequency of the first bending mode of the actuator, two bending vibrations will be superimposed to form elliptical movements on the two driving tips, which is the first operating mode. The other operating mode can be realized easily by changing the working frequency to the second bending mode of the actuator. These two operating modes are calculated and compared in detail. The prototype achieves a maximum no-load speed of 171 mm/s and maximum thrust force of 0.6 N using the first operating mode, whereas these two values are increased to be about 208 mm/s and 0.76 N under the second operating mode. The weight of the proposed piezoelectric actuator is about 17.7 g, and the maximum force weight ratio is tested to be about 42.9 N/kg.

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Study on the Ring Type Stator Design Technique for a Traveling Wave Rotary Type Ultrasonic Motor

Cited by 8 publications

References 15 publications

Research on Low-Speed Driving Model of Ultrasonic Motor Based on Beat Traveling Wave Theory

Research on Low-Speed Driving Model of Ultrasonic Motor Based on Beat Traveling Wave Theory

Rotor optimization for the improvement of ultrasonic motor performance

A novel piezoelectric actuator with two operating modes

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