Efficiency optimization of rotary ultrasonic motors using extremum seeking control with current feedback

Mustafa, Abdullah; Morita, Takeshi

doi:10.1016/j.sna.2019.02.022

Cited by 18 publications

(7 citation statements)

References 14 publications

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“…Mustafa et al, proposed extremum seeking control (ESC) as an adaptive seeking technique with fast convergence and high robustness to optimize the USM performance by tracking maximum efficiency states [243]. The application of a non-sinusoidal periodic excitation voltage to induce a near-square-wave driving tip trajectory in linear ultrasonic motors (LUSMs) was proposed by Le et al [244].…”

Section: Comprehensive Approachesmentioning

confidence: 99%

The Roles of Piezoelectric Ultrasonic Motors in Industry 4.0 Era: Opportunities and Challenges

Wankhede¹,

Xu²

2021

Piezoelectric Actuators - Principles, Design, Experiments and Applications

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Piezoelectric Ultrasonic motors (USM) are based on the principle of converse piezoelectric effect i.e., vibrations occur when an electrical field is applied to piezoelectric materials. USMs have been studied several decades for their advantages over traditional electromagnetic motors. Despite having many advantages, they have several challenges too. Recently many researchers have started focusing on Industry 4.0 or Fourth Industrial revolution phase of the industry which mostly emphasis on digitization & interconnection of the entities throughout the life cycle of the product in an industrial network to get the best possible output. Industry 4.0 utilizes various advanced tools for carrying out the nexus between the entities & bringing up them on digital platform. The studies of the role of USMs in Industry 4.0 scenario has never been done till now & this article fills that gap by analyzing the piezoelectric ultrasonic motors in depth & breadth in the background of Industry 4.0. This article delivers the novel working principle, illustrates examples for effective utilization of USMs, so that it can buttress the growth of Industry 4.0 Era & on the other hand it also analyses the key Industry 4.0 enabling technologies to improve the performance of the USMs.

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Section: Comprehensive Approachesmentioning

confidence: 99%

The Roles of Piezoelectric Ultrasonic Motors in Industry 4.0 Era: Opportunities and Challenges

Wankhede¹,

Xu²

2021

Piezoelectric Actuators - Principles, Design, Experiments and Applications

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“…Ultrasonic motors (USMs) exhibit the characteristics of light weight, low speed, large output torque, no electromagnetic interference and fast response speed [1,2]. They have broad application prospects in aerospace and other national defence and military fields [3,4]. However, due to the piezoelectric energy conversion and frictional energy transfer processes during its work, the USM exhibits a low operating efficiency, and this lost energy is converted into heat energy, which eventually increases the motor temperature [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

A maximum efficiency point tracking control method for ultrasonic motors with temperature compensation

Zhao,

Cai,

Mao

et al. 2023

IET Electric Power Appl

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To compensate for the influence of temperature on the efficiency of an ultrasonic motor (USM), this paper proposed a maximum efficiency point tracking control method for temperature drift by analysing the relationships between the maximum efficiency point and the voltage and frequency of the driving circuit. The method first calculates the frequency update step of the driving circuit by the polynomial surface fitting method, considers the influence of temperature rise on the voltage‐efficiency‐frequency characteristics, and then adjusts the frequency in real time to compensate for temperature effects. Simulation and experimental results show that our method can improve the USM performance at the maximum efficiency point under changing temperature. Maximum efficiency point tracking algorithm with temperature compensation algorithm achieves maximum efficiency in experiment.

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“…Further, if the motor is operated at a frequency in the unstable region of the amplitude-frequency characteristic, systematic divergences will occur. The nonlinear behavior of the motor is challenging the efficiency of the system [ 9 ], the design of the driving circuit [ 10 , 11 ], and the controller [ 12 ]. Therefore, it is crucial to study the nonlinear dynamic response of ultrasonic motors to develop an effective method to design the drive circuit.…”

Section: Introductionmentioning

confidence: 99%

A Design Method of Traveling Wave Rotary Ultrasonic Motors Driving Circuit under High Voltage Using Single-Sided Hertzian Contact Forced Oscillator Model

Huang

Zhao

et al. 2022

Micromachines

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Traveling wave rotary ultrasonic motors (TRUMs) are widely used in various industrial processes due to their attractive features, such as compact structure, high accuracy, and fast response. However, the major limiting factors of the operational performance of TRUMs under high-voltage excitation are the nonlinear behavior caused by the nonlinearities of the piezoelectric materials and the friction between the stator and rotor of the motor. In this study, a nonlinear dynamics model and an identification method are presented to directly design the driver circuit for suppressing the nonlinear behavior under high voltage excitation. Firstly, by studying the time–frequency characteristics of the isolated electrode voltage, a single-sided Hertzian contact forced oscillator model of TRUMs is established, involving the nonlinearities of the piezoelectric material and friction. Secondly, a harmonic balance nonlinear identification is proposed in the time domain for TRUMs. The influence of the voltage and preload on the nonlinear phenomena is discussed. Lastly, a novel driver circuit is proposed to suppress the nonlinearities using feedback from the isolated electrode. Experiments showed that the total harmonic distortion decreased by 89.4% under 500 Vpp. The proposed drive circuit design method is used to find a high excitation voltage and preload to achieve greater motor output power.

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Efficiency optimization of rotary ultrasonic motors using extremum seeking control with current feedback

Cited by 18 publications

References 14 publications

The Roles of Piezoelectric Ultrasonic Motors in Industry 4.0 Era: Opportunities and Challenges

The Roles of Piezoelectric Ultrasonic Motors in Industry 4.0 Era: Opportunities and Challenges

A maximum efficiency point tracking control method for ultrasonic motors with temperature compensation

A Design Method of Traveling Wave Rotary Ultrasonic Motors Driving Circuit under High Voltage Using Single-Sided Hertzian Contact Forced Oscillator Model

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