Effects of wear of friction material on performance of ultrasonic motor

Qu, Jianjun; Guo, Wengfeng; Wang, Yanli

doi:10.1177/1350650112463530

Cited by 13 publications

(10 citation statements)

References 8 publications

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“…Ko et al 14 studied the speed characteristics of motors with various thicknesses of FMs. Qu et al 15 investigated the influence of FM thickness on the performances of TWUSM and found that the optimized FM thickness is 0.3 mm under the experimental conditions. Wang et al 16 researched the influence of preload on the operational eigenmode and noise of TWUSM.…”

Section: Introductionmentioning

confidence: 98%

“…The life and performance are closely related to the wear of FM. 3–5 The wear of FM is quite slow under ultrasonic vibration, so it is difficult to analyze the characteristics of TWUSM in the whole life of FM which means the process from work beginning to failure. In many researches about contact problems, the FM is usually equivalent to an elasticity layer 6–8 or a viscoelasticity layer 2,9–12 which is usually simplified to Kelvin–Voigt model in simulation.…”

Section: Introductionmentioning

confidence: 99%

“…Qu et al. 15 investigated the influence of FM thickness on the performances of TWUSM and found that the optimized FM thickness is 0.3 mm under the experimental conditions. Wang et al.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical and electrical characteristics of traveling wave ultrasonic motors during the whole life of friction material

Zhang

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part J:

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It is difficult to evaluate the characteristics of traveling wave ultrasonic motors (TWUSMs) during the whole life of friction material (FM) because the wear of FM is quite slow. To solve this problem, an accelerated life test method was proposed and the mechanical and electrical characteristics of TWUSMs in the whole life of FM were analyzed systematically. The results show that the mechanical characteristics including speed and efficiency have a decline trend after an ascent with the increase of FM thickness, especially when the load torque is great. When the load torque is greater than 0.4 Nm, the optimum range of FM thickness is 0.10-0.20 mm. When the residual FM thickness is less than 0.17 mm, holding torque is greater than stall torque. Electrical characteristics of TWUSM show monotonicity in the whole life of FM. Therefore, the variations of electrical characteristics could be the wear indicator of FM. Based on experiment analysis, mechanism of interactions and couplings in the energy transfer process of the TWUSM system was explored. The energy transfer process of TWUSM was divided into four subprocesses. The wear of FM is in the intermediate subprocess, which has influence on both output performance and drive circuit of TWUSM. The four subprocesses interact and couple with each other closely. Consequently, the mechanical part and electrical part of TWUSM should be not isolated, and not only the forward action, but also the backward action in energy transfer process should be considered for a more realistic theoretical model of TWUSM.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Mechanical and electrical characteristics of traveling wave ultrasonic motors during the whole life of friction material

Zhang

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Ishii et al established a method to predict the service life of USMs with a carbon‐fiber‐reinforced polymer as the frictional material. Qu et al investigated the tribological properties of polytetrafluoroethylene (PTFE), phenolic resin, and Ekonol composites in different environments and proposed a method for selecting frictional materials incorporating operation conditions. Ding et al designed polyvinylidene fluoride and potassium titanate whisker reinforced polytetrafluoroethylene (PTW/PTFE) composites and found that such composites could improve the wear performance of USMs.…”

Section: Introductionmentioning

confidence: 99%

Friction and wear behavior of PI and PTFE composites for ultrasonic motors

Zhao

Zhang

et al. 2018

Polymers for Advanced Techs

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High-performance polymer-based frictional materials have become increasingly important to improve the mechanical output properties of ultrasonic motors. This study discussed the friction and wear behavior of 2 dominating frictional materials of polymer composites for ultrasonic motors, polyimide (PI), and polytetrafluoroethylene (PTFE) filled by aramid fibers (AF) and molybdenum disulfide (MoS 2 ). To explore the wear mechanisms, the tribo-pair contact stress was theoretically characterized, and the interface temperature rise was numerically predicted. The predictions showed that the flash temperature on asperity tips could reach the glass transition temperature of the polymer materials. The experimental results indicated that the contact stress and sliding speed have a small effect on the friction of the PI composite but influence considerably the friction of the PTFE composite. A higher contact stress brings about a higher specific wear rate, but a higher sliding speed reduces the wear rate. Compared with AF/MoS 2 /PTFE, the AF/MoS 2 /PI has much better tribological performance under high loads and speeds. KEYWORDS friction and wear, polyimide, polytetrafluoroethylene, temperature, ultrasonic motors 1 | INTRODUCTION An ultrasonic motor (USM) is driven by the frictional force between its stator and rotor. Such motors have been extensively used in medical apparatus, precision positioning devices, and aerospace structures because of their fast response capacity, high torque at low speed, and self-locking without the application of external power. 1 However, there are also drawbacks which have hindered the development of USMs, including their low transfer efficiency, poor mechanical output stability, and short service life in harsh environments. To improve the performance of USMs, better frictional materials of ultralow wear rate and stable friction are required because their properties determine directly the output characteristics and service life of USMs in complex, harsh environments. Some frictional materials have been tested for USMs, 2-6 including rubber, resin, metal coatings, alloys, and ceramic composites. It was found that most of them cannot meet the requirements due to, eg, severe wear, short service life, and high noise. Polymer-based frictional materials, however, have been found to be applicable to travelling wave USMs for their excellent wear resistance, low noise, suitable hardness, and thermal stability. For instance, Rehhein and Wallaschek 7 studied the friction and wear behavior of PI composites and found that the inclusion of carbon fibers could improve the wear resistance of PI sliding against steel. Ishii et al 8 established a method to predict the service life of USMs with a carbon-fiber-reinforced polymer as the frictional material. Qu et al 3-5,9,10 investigated the tribological properties of polytetrafluoroethylene (PTFE), phenolic resin, and Ekonol composites in different environments and proposed a method for selecting frictional materials incorporating operation conditions. Ding et al ...

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“…Ishii et al presented a method to predict the service life of USM using CF‐reinforced polymer as frictional materials, which was verified by actual experimental measurements. Qu and coworkers researched a series of polymer‐based frictional materials, such as polytetrafluoroethylene (PTFE), phenolic resin, and Ekonol composites, and compared their tribological properties under different environments and provided a guidance for selecting frictional materials according to the operating condition. Ding and coworkers prepared poly(vinylidene fluoride) (PVDF) and potassium titanate whisker (PTW)/PTFE composites which could also improve anti‐wear ability.…”

Section: Introductionmentioning

confidence: 99%

Effect of surface roughness and reciprocating time on the tribological properties of the polyimide composites

Song

Liu

Ding

et al. 2018

Polymer Engineering & Sci

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Novel polyimide (PI) composites were designed and prepared as a frictional material for ultrasonic motors (USM). The effect of roughness and reciprocating time on the tribological properties of PI composites was specially investigated for simulating USM operating condition. These typical PI composites were designed along with the special characteristics of USM by filling proportional solid lubricants and nanoparticles, and prepared using classical hotpress sintering. The friction and wear behavior of PI composites with different surface roughness polished by SiC sandpaper and various reciprocating time was carried out on a pin-on-plate tribo-meter against GCr15 steel pin. The worn surface was observed by SEM to reveal wear mechanisms. Experimental results indicated that the coefficient of friction and specific wear rate increased with an increase of surface roughness which was detrimental for USM to prolong the service life. The coefficient of friction and wear volume will increase with an increase of reciprocating time due to fatigue wear, but specific wear rate will decrease with the minimum value of 2.1 × 10 −6 mm 3 /N m. This study can provide significant guidance for USM to optimize frictional surface and running-in time. POLYM. ENG. SCI., 59:483-489, 2019.

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Effects of wear of friction material on performance of ultrasonic motor

Cited by 13 publications

References 8 publications

Mechanical and electrical characteristics of traveling wave ultrasonic motors during the whole life of friction material

Mechanical and electrical characteristics of traveling wave ultrasonic motors during the whole life of friction material

Friction and wear behavior of PI and PTFE composites for ultrasonic motors

Effect of surface roughness and reciprocating time on the tribological properties of the polyimide composites

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