Temperature evaluation of traveling-wave ultrasonic motor considering interaction between temperature rise and motor parameters

Li, Shiyang; Ou, Wenchu; Yang, Ming; Guo, Chao; Lu, Cunyue; Hu, Junhui

doi:10.1016/j.ultras.2014.11.007

Cited by 44 publications

(15 citation statements)

References 20 publications

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“…5(b). The feedback voltage is obtained from this auxiliary electrode once the mechanical vibrations are generated on the stator [30]. This feedback voltage U F is proportional to the vibration amplitude of the stator due to the piezoelectric conversion, as shown in Eq.…”

Section: Simplified Speed Model With Different Pulse Numbersmentioning

confidence: 99%

Analysis and control of micro-stepping characteristics of ultrasonic motor

et al. 2020

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Micro-stepping motion of ultrasonic motors satisfies biomedical applications, such as cell operation and nuclear magnetic resonance, which require a precise compact-structure non-magnetization positioning device. When the pulse number is relatively small, the stopping characteristics have a non-negligible effect on the entire stepwise process. However, few studies have been conducted to show the rule of the open-loop stepwise motion, especially the shutdown stage. In this study, the modal differences of the shutdown stage are found connected with amplitude and velocity at the turn-off instant. Changes of the length in the contact area and driving zone as well as the input currents, vibration states, output torque, and axial pressure are derived by a simulation model to further explore the rules. The speed curves and vibration results in functions of different pulse numbers are compared, and the stepwise motion can be described by a two-stage two-order transfer function. A test workbench based on the Field Programmable Gate Array is built for acquiring the speed, currents, and feedback voltages of the startup-shutdown stage accurately with the help of its excellent synchronization performances. Therefore, stator vibration, rotor velocity, and terminal displacements under different pulse numbers can be compared. Moreover, the two-stage two-order model is identified on the stepwise speed curves, and the fitness over 85% between the simulation and test verifies the model availability. Finally, with the optimization of the pulse number, the motor achieves 3.3 µrad in clockwise and counterclockwise direction.

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Section: Simplified Speed Model With Different Pulse Numbersmentioning

confidence: 99%

Analysis and control of micro-stepping characteristics of ultrasonic motor

et al. 2020

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“…And the feedback voltage is proportional to the amplitude of stator. 1,20,21 However, in this study, with the wear of FM (the decrease of FM thickness), the drive voltage increases while the feedback voltage decreases (Figure 12(a) and (b)), the phase difference of drive voltage and feedback voltage is increased (Figure 12(c)) and the speed first increase then decrease ( Figure 8). According to the analysis of energy transfer process, the impedance of piezoceramics ring are changed with the wear of FM, and then impedance of the circuit will be not matching or matching well with the impedance of stator.…”

Section: Energy Transfer Process In Twusmmentioning

confidence: 58%

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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“…The change of ambient temperature will cause the drift of motor impedance characteristics, and the resonance frequency ultrasonic motor will also change. 32 Once the driving frequency could not track this change, it would result in the decrease of the speed and efficiency. In order to study the effect of ambient temperature on the two entropies, a thermostat box (GDJS-408C) is selected for the experiment, which is shown in Fig.…”

Section: Ambient Temperature Changementioning

confidence: 99%

Fault Feature Extraction and Degradation State Identification for Piezoelectric Ceramics Cracking in Ultrasonic Motor Based on Multi-Scale Morphological Gradient

An¹,

Li²,

Chen³

2019

The International Journal of Acoustics and Vibration

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Piezoelectric ceramics cracking is one of the main faults of the ultrasonic motor. According to the morphological mathematics and information entropy, a method based on multi-scale morphological gradient was proposed for ceramics fault feature extraction and degradation state identification. To solve the problem that traditional multi-scale morphology spectral (MMS) entropy cannot exactly describe the performance degradation of the piezoelectric ceramics, multi-scale morphology gradient difference (MMGD) entropy was proposed to improve the sensitivity to the fault. Furthermore, multi-scale morphology gradient singular (MMGS) entropy was presented to reduce the system noise interference to the useful fault information. The disturbance analysis of temperature, load, and noise for MMGD entropy and MMGS entropy was also given in this paper. Combining the advantages of the above two entropies, a standard degradation mode matrix was built to distinguish the degradation state via the grey correlation analysis. The analysis of actual test samples demonstrated that this method is feasible and effective to extract the fault feature and indicate the degradation of piezoelectric cracking in ultrasonic motor.

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Temperature evaluation of traveling-wave ultrasonic motor considering interaction between temperature rise and motor parameters

Cited by 44 publications

References 20 publications

Analysis and control of micro-stepping characteristics of ultrasonic motor

Analysis and control of micro-stepping characteristics of ultrasonic motor

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

Fault Feature Extraction and Degradation State Identification for Piezoelectric Ceramics Cracking in Ultrasonic Motor Based on Multi-Scale Morphological Gradient

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