To see the other types of publications on this topic, follow the link: Ultrasonic motor.
Dissertations / Theses on the topic 'Ultrasonic motor'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Ultrasonic motor.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Ocklind, Henrik. "Driver Circuit for an Ultrasonic Motor." Thesis, Linköpings universitet, Elektroniksystem, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-101013.
Full textAbstract:
To make a camera more user friendly or let it operate without an user the camera objective needs to be able to put thecamera lens in focus. This functionality requires a motor of some sort, due to its many benefits the ultrasonic motor is apreferred choice. The motor requires a driving circuit to produce the appropriate signals and this is what this thesis is about.Themain difficulty that needs to be considered is the fact that the ultrasonic motor is highly non-linear.This paper will give a brief walk through of how the ultrasonic motor works,its pros and cons and how to control it. How thedriving circuit is designed and what role the various components fills. The regulator is implemented in C-code and runs on amicro processor while the actual signal generation is done on a CPLD. The report ends with a few suggestions of how toimprove the system should the presented solution not perform at a satisfactory level.
2
Arkad, Jenny, and Tomas Andersson. "A Control Algorithm for an Ultrasonic Motor." Thesis, Linköpings universitet, Reglerteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-69424.
Full textAbstract:
This report is the result of a master thesis work where the goal was to develop acontrol system for a type of ultrasonic motor. The ultrasonic motors use ultrasonicvibrations from a piezoelectric material to produce a rotating motion. They arepowered by two sinusoidal voltages and their control signals generally are thevoltages amplitude, frequency and the phase difference between the two voltages.In this work the focus is on control using only amplitude and frequency. A feedbacksignal was provided by an encoder, giving an angular position. The behavior of themotors were investigated for various sets of control signals. From collected data alinearized static model was derived for the motor speed. This derived model wasused to create a two part control system, with an inner control loop to managethe speed of the motors using a PI controller and an outer control loop to managethe position of the motors. A simple algorithm was used for the position controland the result was a control system able to position the motors with a 0.1 degreeaccuracy. The motors show potential for greater accuracy with a position feedback,but the result in this work is limited by the encoder used in the experiments.
3
Choi, Henry O. "A linear ultrasonic motor for nano-technology." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/38148.
Full text
4
Sharp, Scott L. "Design of a Linear Ultrasonic Piezoelectric Motor." BYU ScholarsArchive, 2006. https://scholarsarchive.byu.edu/etd/997.
Full textAbstract:
A new geometrically unique ultrasonic motor (USM) was designed using finite element modeling (FEM). A USM operates by vibrating a drive tip in an elliptical motion while it is in periodic contact with a driven surface. Piezoelectric elements are used to create the elliptical motions and are driven near a resonant frequency to create the needed displacements for the motor to operate. An idea for a motor frame was conceived that consisted of an arch, a center ground, and two piezoelectric elements connected to the center ground. End caps were added between the frame and the piezoelectric elements to reduce the stress of the elements. Legs located at the bottom of were used to increase the rigidity. Several FEM programs were written to design the motor and to predict its performance. The FEM motor model exceeded the performance characteristics of the benchmark Nanomotion HR1. The model predicted a linear motor capable of pushing up to 5 N and a maximum speed of 0.4 m/s. A prototype frame was built out of tool steel and run against an oxide ceramic plate. The USM prototype's piezoelectric elements did not provide the expected displacements in the motor frame as determined by the FEM. The discrepancy was determined to be caused manufacturing errors. Soft glue layers were thicker than expected on each side of the piezoelectric elements causing a large amount of compliance inline with the piezoelectric motion. An additional unexpected layer of glue between the end cap and frame increased the compliance inline with the piezoelectric elements even more. It was also determined that even if the motor had been assembled properly that Hertzian displacement would have caused a 1/3 decrease in piezoelectric motion. The prototype frame's steady state displacements were approximately 20% of the expected output from the FEM models. The motor was still able to achieve a maximum speed of 55.6 mm/s and a push force of 0.348 N at a preload of 6 N. It is expected that a motor assembly correctly dimensioned and manufactured and designed to minimize Hertzian displacement would result in a significantly better performing prototype.
5
鍾尚威 and Sheung-wai Chung. "Motion control of a travelling-wave ultrasonic motor." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B42575904.
Full text
6
Chung, Sheung-wai. "Motion control of a travelling-wave ultrasonic motor." Click to view the E-thesis via HKUTO, 2001. http://sunzi.lib.hku.hk/hkuto/record/B42575904.
Full text
7
Kalem, Volkan. "Development Of Piezoelectric Ceramics For Ultrasonic Motor Applications." Phd thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12612935/index.pdf.
Full textAbstract:
This study has been carried out to develop and manufacture piezoelectric ceramic materials which are utilized for ultrasonic motor (USM) applications. For this purpose, the effect of compositional modifications on the dielectric and piezoelectric properties of lead zirconate titanate (PZT) based ceramics was investigated.
PZT based powders were produced using the mixed oxide method. The base composition was selected as Pb(Zr0.54Ti0.46)O3. The samples in the proximity of morphotrophic phase boundary were doped with strontium, lanthanum, lead manganese niobate (PMnN) and lead manganese antimonate (PMS) in order to improve the structural characteristics and electromechanical properties which are very important for USM applications. The dielectric constant, planar coupling coefficient, mechanical quality factor, piezoelectric strain constant and tangent loss values were evaluated in accordance with standard IRE (Institute of Radio Engineers) test procedures.
The results on dielectric and piezoelectric properties showed that piezoelectric ceramics with high mechanical quality factor, high piezoelectric strain constant and low tangent loss could be produced by using the aforementioned dopants. As a result, a new piezoelectric ceramic named as 0.97[PSLZT]-0.024[PMnN]-0.006[PMS] was produced with KT= 1913, Qm= 1240, d33= 540 pC/N, tan delta= 0.89%, kp= 0.57 and Tc= 235 °C. This composition is a good candidate for high power applications. The ceramic samples with the developed compositions were used to produce an ultrasonic-wave type motor and the performance of the USM was evaluated in terms of speed, torque and efficiency.
8
Bauer, Markus Georg. "DESIGN OF A LINEAR HIGH PRECISION ULTRASONIC PIEZOELECTRIC MOTOR." NCSU, 2001. http://www.lib.ncsu.edu/theses/available/etd-20010926-162049.
Full textAbstract:
BAUER, MARKUS GEORG. Design of a Linear High Precision Ultrasonic Piezoelectric Motor. (Under the direction of Dr. Thomas A.Dow.)To understand the operating principles of linear ultrasonic piezoelectric motors, a motor made by Nanomotion Ltd. was examined and a model of the driving process was developed. A new motor has been designed that uses the same driving process but improves resolution, speed, efficiency and especially controllability. All designs involve at least two independently driven piezoelectric elements, one generating the normal load at the interface and the second generating the tangential driving force. The greatest challenges in developing this motor are 1) the actuator needs to have two different mode shapes at nearly the same frequency and 2) each mode shape must be exclusively excited by one actuator and not by the other. The quality of the operation of the motor directly depends on how well the excitation of both vibrations can be separated.Finite element analysis (FEA) has been used to model the actuator and predict the dynamic properties of a future prototype. The model includes all significant features that have to be considered such as the anisotropy of the piezoelectric material, the exact properties and the dimensions of the actuators (including all joints). Several prototypes have been built, and the resulting mode shapes and natural frequencies have been measured and compared to the computer models. The design concepts as well as the modeling techniques have been iteratively improved. Open loop testing has shown that the motor generates slideway motion such that the steady state slideway velocity is proportional to the excitation voltage. To fully characterize the motor and to demonstrate its full potential for positioning tasks, the motor has been tested in a closed loop control system. Despite saturation of the control input and nonlinearities in dynamics of the motor-slideway system, it was shown that a simple feedback control system using proportional gain or proportional-integrating control algorithms can be used to achieve a stable responsive positioning system.
9
Venkatesan, Nishant. "AN EVALUATION OF THE TRAVELING WAVE ULTRASONIC MOTOR FOR FORCE FEEDBACK APPLICATIONS." UKnowledge, 2009. http://uknowledge.uky.edu/gradschool_theses/575.
Full textAbstract:
The traveling wave ultrasonic motor is considered for use in haptic devices where a certain input-output relation is desired between the applied force and the resulting motion. Historically, DC motors have been the standard choice for this purpose. Owing to its unique characteristics, the ultrasonic motors have been considered an attractive alternative. However, there are some limitations when using the ultrasonic motor for force-feedback applications. In particular, direct torque control is difficult, and the motor can only supply torque in the direction of motion. To accommodate these limitations we developed an indirect control approach. The experimental results demonstrate that the model reference control method was able to approximate a second order spring-damper system.
10
Murphy, Devon Patrick. "Analysis of a Rotary Ultrasonic Motor for Application in Force-Feel Systems." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/34989.
Full textAbstract:
A qualitative analysis of a rotary traveling wave-type ultrasonic motor (USM) used to supply feedback forces in force-feel systems is carried out. Prior to simulation, the subsystems and contact mechanics needed to define the motorâ s equations of motion are discussed along with the pitfalls of modeling a USM. A mathematical model is assembled and simulated in MATLAB Simulink. Accompanying the dynamic model, a new reduced model is presented from which predictions of USM performance can be made without a complicated dynamic model. Outputs from the reduced model are compared with those of the dynamic model to show the differences in the transient solution, agreement in the steady state solution, and above all that it is an efficient tool for approximating a motorâ s steady state response as a function of varying the motor parameters. In addition, the reduced model provides the means of exploring the USMs response to additive loading, loads acting in the direction of motor motion, where only resistive loads, those opposite to the motor rotation, had been considered previously. Fundamental differences between force-feel systems comprising standard DC brushless motors as the feedback actuators and the proposed system using the USM are explained by referencing the USM contact mechanics. Outputs from USM model simulations are explored, and methods by which the motor can be implemented in the force-feel system are derived and proven through simulation. The results show that USMs, while capable of providing feedback forces in feel systems, are far from ideal for the task. The speed and position of the motor can be controlled through varying stator excitation parameters, but the transient motor output torque cannot; it is solely a function of the motor load, whether additive or resistive.Master of Science
11
Juang, Puu-An. "Design, analysis, measurement and control of a new disc-type ultrasonic motor system." Thesis, University of Leicester, 2005. http://hdl.handle.net/2381/30233.
Full textAbstract:
In this thesis, a novel disc-type ultrasonic motor stator is investigated. The stator has an asymmetrical structure (120°-90°-150° support boundary configuration) on its surface. The advantages of this structure include a single electrical phase driving, multiple-resonant-modes driving, rotational direction changes by modulation of driving frequencies, single contact point, and simple driving electrical circuit. With the setup of a precision laser vibrometer measurement experiment, mode motions and wave propagations of the UM are analyzed. The model is further verified by using finite element simulations where a 3-dimensional mechanical element with an extra electrical degree of freedom is used and then electrical impedance response, phase response and mechanical frequency response of the UM are studied. Furthermore, a transfer function model and equivalent circuit model of the Um in terms of radial and tangential displacement components are established for control objectives and for certification of dynamic characteristic parameters. The equivalent circuit model verifies radial, tangential and couple vibration modes once more and is used in search of resonance frequencies. The PSPICE has been used to simulate the equivalent circuit components. Finally, a speed control scheme is implemented by using current modulation and commercial DSP technique, in order to keep the revolution speed constant. The proposed ultrasonic motor system has proven good dynamic behaviours with the driving frequency range of 65k-100kHz and reaches a maximum revolution speed of 600rpm.
12
McFarland, Andrew J. (Andrew John). "Modeling, design, development, and testing of a piezoelectric traveling wave rotary ultrasonic motor for space applications." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/11585.
Full text
13
Pippi, Rafael Silva. "Motor ultra-sônico linear com geometria tubular." Universidade Federal de Santa Maria, 2008. http://repositorio.ufsm.br/handle/1/3656.
Full textAbstract:
Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorThis work presents the study on a linear ultrasonic motor with tubular geometry for linear displacements. Similar topologies, reported elsewhere, are conceived for producing rotary motions. Due to some particular characteristics of this geometry, not explored yet, a new study on interaction between resonance modes in a hollow cylinder for linear movement generation is proposed. In order to experimentally investigate the resonance modes in tubular stators, a proof of concept prototype was built and tested. The prototype consisted of a internally toothed phosphore bronze tube, excited by two PZT rings. Several types of mobile axes, with one or more solid cylinders of aluminum or stainless steel, were employed. The methodology of test consisted of changing geometric parameters, properties of materials, sweeping driving conditions, and observing the respective movement on the shaft. Tests showed the production of linear and/or angular movements, with maximum speeds of 0,07m/s, but with little uniformity and repeatability. The lack of conclusive hypothesis on the stability issue, based only on experimental set of results, has led to a reassessment of the methodology of investigation, including additional analysis tools for the characterization of the device. So, a simple analytical modeling of the stator was formulated to set up a project methodology. Despite its simplicity and limitations, the analytical model allows a first order approximation for resonance modes, and relates them to the constructive parameters of the stator. In order to take the influence of the factors neglected in the analytical modeling into account, the analysis was complemented with finite element method (FEM) simulations. The deformation profiles of the stator to the 21st resonance mode were analyzed using FEM. With the results, it is possible to predict the behavior of the resonance frequencies, and the corresponding deformations they produce on the teeth, for each stator configuration. The most important result of this analysis is to show the relationship between aspect ratio of ellipsoidal trajectory on the stator teeth and the geometry of the stator. This allows a conclusive diagnosis on the inefficiency of the built prototype: The small amplitude of the longitudinal component of traveling deformation wave. An analysis of simulations results has lead to a design methodology for this new type of motor. The results showed that if the stator is redesigned according to the proposed methodology, it would be able to produce longitudinal deformations of 2.6 μm, with ceramics driven at 35.3 V. If Compared to simulations of the prototyped stator the new project exhibits an increase of 90% for radial deformation components of, and 3600% for the longitudinal components, indicating that if the new design was implemented, it could achieve much higher efficiency in movement production.
Este trabalho apresenta o estudo de um motor ultra-sônico com geometria tubular para movimentos lineares. Outros motores com geometria tubular, encontrados na bibliografia, são concebidos para a produção de movimentos rotativos. Devido a diversas características ainda não exploradas desta geometria, um novo estudo sobre a interação dos modos naturais de vibração de um cilindro vazado para a geração de movimento linear é proposto. Com o objetivo de investigar experimentalmente os modos de ressonância em estatores tubulares, um protótipo para prova de conceito foi construído e ensaiado. O protótipo consiste de um tubo vazado, dentado internamente, excitado por dois anéis de PZT. Foram utilizados diversos tipos de eixos móveis, com um ou mais cilindros maciços de alumínio ou aço inoxidável. A metodologia de ensaio consistiu da variação dos parâmetros geométricos, propriedades de materiais e condições de acionamento, e da respectiva observação e medição dos movimentos do eixo. Os testes evidenciam a produção de movimentos lineares e/ou angulares com velocidades máximas de aproximadamente 0,07m/s, mas com pouca uniformidade e repetibilidade. A impossibilidade de uma análise conclusiva sobre a instabilidade do motor com base apenas nos resultados experimentais de bancada motivou uma reavaliação da metodologia de estudo e a busca de ferramentas adicionais para a caracterização do dispositivo. Uma modelagem analítica do estator foi formulada para que um roteiro de análise e cálculos dimensionais pudessem ser estabelecidos. Embora simples e com diversas limitações, o modelo obtido permite aproximações de primeira ordem para os modos de ressonância em função dos parâmetros construtivos do estator. Para que a influência das não-linearidades não incluídas na modelagem possa ser avaliada, a análise foi complementada com simulações pelo método dos elementos finitos (FEM). Os perfis das deformações do estator até o 21o modo de ressonância foram analisados utilizando FEM. Com os resultados obtidos, é possível prever o comportamento das freqüências naturais e das deformações nos dentes em função das características do estator. O resultado mais importante desta análise é mostrar a relação de aspecto da trajetória elipsoidal dos dentes do estator, com a geometria do estator, permitindo um diagnóstico conclusivo sobre a ineficiência do protótipo construído: A baixa amplitude da componente de deformação longitudinal da onda viajante no tubo. O estudo dos resultados das simulações permitiu o estabelecimento de um roteiro de análise e cálculos dimensionais para este novo tipo de motor. Simulações realizadas mostraram que um estator projetado com o roteiro proposto, é capaz de produzir deformações longitudinais de 2,6μm e radiais de 3,8μm, quando as cerâmicas piezelétricas são acionadas a 35,3 V. Comparando-se os resultados das simulações do estator prototipado com o novo projeto, observa-se um acréscimo teórico de 90% nas componentes de deformação radial e 3600% nas componentes longitudinais, indicando que um novo protótipo construído de acordo com o projeto pode atingir uma eficiência muito superior na produção de movimento.
14
Sun, Xun. "Design of Piezoelectric Reaction Wheels for Nanosatellite Attitude Control." Thesis, The University of Sydney, 2019. https://hdl.handle.net/2123/22135.
Full textAbstract:
The Attitude control system is one of the most critical subsystems for nanosatellite missions, especially those missions which carry pointed payloads. A precise attitude control system can increase the payload compatibility and discover the new potential of nanosatellites. In this thesis, novel attitude control actuators and control algorithm base on piezoelectric ultrasonic motors were developed to overcome the limitations of size and power of nanosatellites, and the disadvantages of conventional nano reaction wheels. This design consists of a miniaturised driving circuit design for piezoelectric ultrasonic motors and actuators; a linear ultrasonic motor base gimbal design; a dual actuator reaction wheel design and a modified backstepping controller design for dual actuator attitude control systems of nanosatellites. The results of experiments and simulations show that the piezoelectric ultrasonic motors can be a part of nanosatellites attitude control actuators. The piezoelectric ultrasonic motors and actuators can significantly improve the accuracy and the low-speed control linearity of conventional reaction wheels of nanosatellites.
15
Shafik, Hassan Abd Alla Mahmoud. "Computer aided analysis and design of a new servo control feed drive for electro discharge machining using piezoelectric ultrasonic motor." Thesis, De Montfort University, 2003. http://hdl.handle.net/2086/4301.
Full text
16
Wieneke, Jacob Daniel. "A feasibility assessment of using ultrasonic sensor position feedback for a ball-and-beam apparatus." Thesis, Kansas State University, 2010. http://hdl.handle.net/2097/6241.
Full textAbstract:
Master of ScienceDepartment of Mechanical and Nuclear Engineering
Warren N. White
This thesis describes the process of testing and implementing ultrasonic transducers for ball position feedback on a ball-and-beam apparatus. Also included are specifications for equipment to allow feedback and command signals to be wireless, not hardwired to the control computer. The author presents various ball-and-beam configurations as well as details about the specific configuration used for this work. These details include choices in sensors, materials, hardware, construction, and controller. After the apparatus has been described, the author provides information to support claims about system performance. The conclusions presented specify the necessary hardware to make the system wireless and indicate that acoustic sensors can complete a successful ball-on-beam balancing system.
17
Muhammad, Zakir Hossain. "High resolution ultrasonic monitoring of muscle dynamics and novel approach to modelling." Doctoral thesis, Universitätsbibliothek Leipzig, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-102502.
Full textAbstract:
The presented work is concerned with the development and application of an ultrasonic detection scheme suitable for the monitoring of muscle dynamics with high temporal - down to 5 µs - and spatial resolution - down to 0.78 µm. A differential detection scheme has been developed to monitor the variations of the velocity of longitudinal polarized ultrasound waves travelling in contracting and relaxing muscle, compensating for variations of the path length by referencing to a frame. The observed time dependent variations of the time-of-flight of the ultrasonic waves caused by variations in the muscle and in addition by minor deformations of the enclosure are detected each separately and synchronously and are evaluated differentially. Beside of the detected increase of the speed of sound observed for contracted muscle with respect to the relaxed state of about 0.6%, the recovery time from maximum isometric contraction is quantified and relaxation processes are observed for the recovery phase following the isometric contraction. The developed ultrasonic calliper was employed to monitor both, the brain controlled and externally excited muscle dynamics with sampling intervals down to 10 ms synchronously with signals relating to the excitation. Monitored are the activation, hold, and relaxation phase for maximum voluntary isometric contraction of the gastrocnemius muscle. A so far not reported post tetanus overshoot and subsequent exponential recovery are observed. Both are attributed to the muscle as suggested by combined monitoring with EMG and are modelled with a lumped mechanical circuit containing an idealized bidirectional linear motor unit, ratchet, damper, and springs. Both, the rapid contraction and relaxation phases require a high order filter or alternatively a kernel filter, attributed to the nerve system as suggested by external electric stimulation. The respective response function is modelled by an electrical lumped circuit. Together with a reaction time and occasionally observed droops in the hold phase, both adjusted empirically, the monitored response is represented in close approximation by the combined electrical and mechanical lumped circuits. The respectively determined model parameters provide a refined evaluation scheme for the performance of monitored athletes. Valuable parameters relate to the latent period, the muscle response time, the activation and deactivation dynamics, a possible droop and other instabilities of the hold phase, and parameters characterizing the relaxation phase including the observed post tetanus overshoot and subsequent contraction. Monitored and modelled are also the different processes involved in active muscle dynamics including isotonic, isometric, and eccentric contraction or stretching. The developed technology provides time sequential observation of these processes and registration of their path in the extension and force parameter space. Under suitable conditions the closed-loop cycles of mind controlled human muscle movements proceed along characteristic lines coinciding with well identifiable elementary processes. The presentation of the monitored processes in the extension and force parameter space allows the determination of the mechanical energy expenditure for the observed different muscle actions. An elementary macroscopic mechanical model has been developed, suitable to express the basic features of the monitored muscle dynamics.
18
Alnakar, Raran, and Danilo Catovic. "Rotary parking system." Thesis, KTH, Mekatronik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-295808.
Full textAbstract:
Automatic parking systems are intended to save a lot ofspace and create a more favourable parking experience. In this thesis the main goal was to create a functional and user-friendly rotary parking system. The system consistsof a framework, DC-motor, driveline, ultrasonic distance sensor and platforms. Most of the construction consists of plastic, the remaining parts are made of metal. The system was evaluated using two experiments, one that measured the speed of the system and the other one measuring the level of accuracy. After the first experiment, it was concluded that the system works well for the corresponding speed. The second experiment showed that improvements of the accuracy can be made.Automatiska parkeringssystem är avsedda att spara utrymme och skapa en bättre parkeringsupplevelse. I denna avhandling var huvudmålet att skapa ett funktionellt och användarvänligt roterande parkeringssystem. Systemet består av ett ramverk, likströmsmotor, drivlina, ultraljudssensor och plattformar. Majoriteten av konstruktionen består av plast, de återstående delarna är gjorda av metall. Systemet utvärderades med hjälp av två experiment, ett som mätte systemets hastighet och ett annat som mätte noggrannheten. Efter det första experimentet drogs slutsatsen att systemet fungerar bra för motsvarande hastighet. Det andra experimentet visade att förbättringar av noggrannheten kan göras.
19
Alnakar, Rayan, and Danilo Catovic. "Rotary parking system." Thesis, KTH, Mekatronik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-295808.
Full textAbstract:
Automatic parking systems are intended to save a lot ofspace and create a more favourable parking experience. In this thesis the main goal was to create a functional and user-friendly rotary parking system. The system consistsof a framework, DC-motor, driveline, ultrasonic distance sensor and platforms. Most of the construction consists of plastic, the remaining parts are made of metal. The system was evaluated using two experiments, one that measured the speed of the system and the other one measuring the level of accuracy. After the first experiment, it was concluded that the system works well for the corresponding speed. The second experiment showed that improvements of the accuracy can be made.Automatiska parkeringssystem är avsedda att spara utrymme och skapa en bättre parkeringsupplevelse. I denna avhandling var huvudmålet att skapa ett funktionellt och användarvänligt roterande parkeringssystem. Systemet består av ett ramverk, likströmsmotor, drivlina, ultraljudssensor och plattformar. Majoriteten av konstruktionen består av plast, de återstående delarna är gjorda av metall. Systemet utvärderades med hjälp av två experiment, ett som mätte systemets hastighet och ett annat som mätte noggrannheten. Efter det första experimentet drogs slutsatsen att systemet fungerar bra för motsvarande hastighet. Det andra experimentet visade att förbättringar av noggrannheten kan göras.
20
Tuncdemir, Safakcan. "Design Of Mini Swimming Robot Using Piezoelectric Actuator." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605682/index.pdf.
Full textAbstract:
This thesis deals with the design, fabrication and analysis of a novel actuator for a fish-like swimming mini robot. The developed actuator is tested on a mini boat. The
actuator relies on a novel piezoelectric ultrasonic motor, developed according to the design requirements of actuator for fish-like swimming mini robots. Developed motor is within the dimensions of 25x6x6 mm in a simple mechanical structure with simple driving circuitry compared to its predecessor. Bidirectional rotation of the motor is transformed to a flapping tail motion for underwater locomotion in a simple mechatronic structure. The simplicity in the motor and actuator enables
further development on the miniaturization, improvement on the performances as well as easy and low cost manufacturing. The developed actuator is a candidate to
be used in mini swimming robot with fish- like locomotion.
21
Zahradníčková, Ludmila. "Systém pro bezkontaktní měření otoku končetiny." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-316746.
Full textAbstract:
Determination of the extent and state of a limb edema is based on information about its current volume. There are a number of methods for volume measurements. The theoretical part of this semestral thesis discusses the etiology, classification and principles of volume measurements and basic information about ultrasound and stepper motors. The practical part consists of a design of own device for a contactless limb volume measurement with ultrasonic module. It consists of a code for a microcontroller which controles the whole system including the computational operations and a real model of the system.
22
Chang, Chi-Lon, and 張慶龍. "Ultrasonic Motor Positioning Assistive System." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/24047564978262569459.
Full textAbstract:
碩士國立成功大學
電機工程學系碩博士班
94
In recent few years, the traffic and the fortuitous accidents result in paralytic events frequently, these disabled persons urgently need assistive device to support their daily activities. The purpose of this thesis is to use ultrasonic sensor components as a phase shift detector to help disabled persons who want to use mouth -control Text Input system as the input device of the computer by themselves. They can only slightly turn their head and utilize ultrasonic components to detect their shifting behavior, it will produce a signal to microprocessor to control the DC motor with accurating precision positioning by coding. DC motor controls a robot arm to bring the mouth-control switch back to the disabled person’s mouth when the switch leaves his or her mouth. As such, they can not only use computer conveniently by themselves but also reduce the dependence on families in daily activities.
23
Nguyen, Truong-son, and 阮長山. "Fuzzy Speed Control for Ultrasonic Motor." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/09996824188587212314.
Full textAbstract:
碩士義守大學
機械與自動化工程學系碩士班
98
In this thesis, we utilize Matlab software, Sensoray I/O card model 626 and an ultrasonic motor to develop a fuzzy speed control system. We found that a fixed supplied voltage cannot keep the speed stay constant. Therefore, our goal is to establish a fuzzy model to compensate the variation in speed and try to keep it as stable as possible. The temperature of the ultrasonic motor rises up as the operation goes on. This variation in temperature will change the system model. Then, the speed of ultrasonic motor will decrease gradually. To modify the performance, we construct a fuzzy control model in Matlab Simulink to adjust the provided voltage to the ultrasonic motor in order to keep the rotational speed stable.
24
Rong-Jong, Wai, and 魏榮宗. "Drive and Intelligent Control of Ultrasonic Motor." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/59482552564087808467.
Full textAbstract:
博士中原大學
電子工程學系
87
This dissertation describes the driving characteristics and control principles of traveling-wave type ultrasonic motor (USM) in detail, and designs new driving circuits and control structures for the USM. The inherent parasitic capacitances of the USM are used as the resonant components to design the resonant inverters including a series-resonant inverter, a parallel-resonant inverter with an energy feedback circuit and a high-order LLCC resonant inverter. The detailed theories of the resonant inverters are derived. Though the revolution speed of the rotor can be controlled by the variation of the switching frequency of the inverters, the amplitude and phase of the output voltages of the series and parallel resonant inverters will be seriously influenced by the variation of the quality factors and that even results in unstable system response. To overcome the mentioned problems, advanced power electronic techniques are developed, which include reducing the quality factor using an energy feedback circuit for parallel-resonant inverter and LLCC resonant inverter. The exact mathematical model of USM can not be obtained currently and the motor parameters are nonlinear and time-varying due to increase in temperature and changes in motor drive operating conditions, such as driving frequency, source voltage, load torque and static pressure force between stator and rotor of USM. Therefore, the design of high-performance controllers for USM are more complex than those of electro-magnetic motors. In this dissertation, intelligent control strategies, which comprise fuzzy control, neural network control and fuzzy neural network control, are adopted to control the rotor position of the USM. The theoretical analyses for the intelligent control techniques are described in detail. Moreover, to guarantee the convergence of tracking errors, analytical methods based on a discrete-type Lyapunov function are derived to determine the varied learning rates of the networks. Finally, the effectiveness of the proposed newly-designed circuits and intelligent control structures is demonstrated by experimental results.
25
Hong, Jian-Yi, and 洪健益. "Linear Ultrasonic Motor Driver with Positioning Control." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/41315166066647885669.
Full textAbstract:
碩士國立東華大學
電機工程學系
97
The purpose of this thesis is to develop a dsPIC-based fuzzy neural networks driver for a linear ultrasonic motor (LUSM) which can achieve position control. The developed systems can be separated into two parts, one is the driver system, and the other is the positioning control system. As for drivers, a single-stage high-power-factor half bridge resonant inverter and a single-stage high-power-factor class E resonant inverter are developed to drive the LUSM. The single-stage half bridge resonant one is originated from a buck-boost converter integrated with a half bridge resonant inverter. With asymmetrical pulse-width-modulation (APWM), the output voltage can be effectively regulated. The single-stage class E resonant driver is integration of a buck-boost converter and class E resonant inverter. For both of the drivers, the power switches exhibit either zero-voltage-switching (ZVS) or zero-current-switching (ZCS) over the operating range to enhance the circuit efficiency. The buck-boost converter is operated at discontinuous conduction mode (DCM) to provide nearly unity power factor at a fixed frequency. Since the exact mathematical model of LUSM is not easy to figure out. A fuzzy neural network (FNN) controller is developed in this thesis to regulate the single-axis platform. With the proposed intelligent controllers, the position response of the mover of the single-axis platform possesses the advantages of good transient control performance and robustness to uncertainties for the tracking of periodic reference trajectories. Finally, the effectiveness of the proposed control schemes is verified by some experimental results.
26
Chou, Yuan Cheng, and 周源城. "analysis and design of an ultrasonic motor." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/63848602113559761026.
Full text
27
Wang, Ya-Chen, and 王雅貞. "The Design of the Ultrasonic Motor Driver." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/49274726431201358235.
Full textAbstract:
碩士中華大學
電機工程學系碩士班
90
The ultrasonic motor (USM) driver is needed accurate resonance frequency and good driving ability to reach optimum resonance effect. We begin with studying the behavior and principle of the USM control circuit block from the existed patterns, made from several parts, which are time cost and difficult for measures and adjustments. So we utilize the micro-controller to control the output frequency from the USM driver. An advantage of the micro-controller is easily programmable, so we can vary the output frequency easily and exactly. And it can help us a lot to model the parameter of the USM measurement and experiment. And further, on the driving ability hand, it can make us to concentrate on the design of the switching mode power supply to provide good driving ability.
28
Yen, Chi-Yung, and 顏吉永. "A Sliding-Mode Control of the Ultrasonic Motor." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/71424144300842294570.
Full textAbstract:
博士國立清華大學
工程與系統科學系
93
In this dissertation, the design of a driving system and a nonlinear robust controller for a novel thin-disc type edge-driving ultrasonic motor for precisely positioning was developed. Using piezoelectric buzzer as the ultrasonic actuating component (stator), the novel design of thin-disc piezoceramic-driving ultrasonic actuator was performed. Under three constraints put on the specific geometry positions on the metal sheet, the varying behaviors of flexural waves were formed from different directions to construct the driving zone to rotate the rotor. The simple structure of the actuator, with low cost, had demonstrated that the mechanical design of the actuator and the rotor could be separated, depending on what we needed in applications. At first, the driving circuit with advance feature, composed of a DC-DC buck converter and a single-phase half-bridge series-resonance inverter, was implemented in this paper. Next, the related important dynamic characteristics, such as preload, velocity, hysteresis, and dead-zone, were analyzed. Through system identification technique to obtain the approximate mathematical model of the ultrasonic motor, the various designs of sliding-mode position controllers were proposed for the performance evaluation. Thus the novel ultrasonic actuating motor had been proven in the excellent positioning capability with robust rejection to noise disturbances by the means of effective simulations and experiments via position tracking commands of sinusoidal and periodic step functions.
29
陳新和. "Finite Element Analysis of a Piezoelectric Ultrasonic Motor." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/37474580780390063774.
Full textAbstract:
碩士國立臺灣科技大學
機械工程系
92
The main components of a traveling wave type piezoelectric ultrasonic motor include stator and rotor. The stator may be composed of one or two piezoelectric rings and one metal disk with teeth. The rotor is pressed tightly on top of the stator. The drive harmonic voltages excite a traveling bending wave within the stator. The frictional force between the horizontally moving stator surface and rotor causes the rotor to spin. The objective of present study is developing a finite element model to analyze the dynamic characteristics of the traveling wave type ultrasonic motor.First this study uses the first-order shear deformable laminated plate theory to obtain the mechanical displacement field of a laminated plate.Applying the Hamilton’s principle incorporated with the constitutive relations of a piezoelectric material to formulate the variational equation of a piezoelectric laminated plate element. Substituting the finite element solutions of the mechanical displacement field into the above variational form, the finite element equation of motion of the present piezoelectric laminated plate element is abtained. Using the above piezoelectric laminated plate finite element model,this study analyzes the natural frequencies and mode shapes of the stator of the ultrasonic motor. The present results are compared with those in the literature to assure the accuracy of the present finite element model. The traveling bending wave within the stator subjected to harmonic voltages can be generated by using the present plate element equation of motion and the Newmark direct integration scheme.
30
陳瑞得. "Design of an Anti-symmetry Type Ultrasonic Motor." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/90982443313245813650.
Full textAbstract:
碩士國立清華大學
工程與系統科學系
93
A novel anti-symmetric type ultrasonic motor is proposed in this study. By applying anti-symmetric constraints on a unimorph piezo thin-disk vibrator, an in-plane vibration mode with multi-driving areas, same rotating direction, and approximate deformed displacement can be acquired. Furthermore, by appropriate cutting edges, the deformation of the other edges will be enhanced further, for example, the driving speed of the vibrator with “70°-110°_12 -13.5_cut” constrains is increased 26 % compared with the same vibrator but without any cutting edges. A rotor thus can be rotated efficiently by the vibrator’s multi-driving edges. The proposed anti-symmetric vibrator with “65°-115°_12-13.5_cut” constrains which was made of OBO-31mm piezo buzzer element possesses good driving ability. Its operating range 12~30 Vpp is wider than the range 12~18 Vpp of “3-4-5 type” vibrator in privies study [10]. Its power dissipation and the driving speed are 1.6 W and 1400 mm/s correspondingly when the input voltage is 30 Vpp and the preload is 30 gw; its vibrating speed on each driving edges can still reach to 250 mm/s when the preload applied up to 200 gw. The proposed vibrator not only expands the operating voltage range but also reduces the power consumption about 62 % and promotes motor’s efficiency about 50 % according the experimental comparative results with the “3-4-5 type” one. Summery, the proposed anti-symmetric type ultrasonic motor has merits of multi-driving ability, higher diving torque, and steady structure that can expand its applications to thin-disk fans and cooling pumps which need larger torque or turn many rotors at the same time in Biotech.
31
Li-Wen, Lin, and 林麗雯. "Optimal Torque Design of An Ultrasonic Motor System." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/73207880674580491230.
Full textAbstract:
碩士國立中正大學
機械系
93
In order to make the rotor move around, the ultrasonic motor makes use of the friction between the rotor and the deformation produced by inverse piezoelectric effect caused by the electrified stator. This study is primarily aimed at increasing the maximum interface torque between the rotor and the stator to shorten the time of the rotor starting to move around. With optimum methods, we can reduce the time of making the rotor move around and then drive the object when the motor bears equal external torque. This study defines two single objective functions. One is the maximum interface torque between the rotor and the stator and the other is the stable angular velocity of the rotor. The main purpose of the former function is to shorten the time of the rotor starting to move around. And the latter function reduces the whole work time by a larger angular velocity. The optimum methods chosen in this study are Sequential Quadratic Programming Method (SQP) and Genetic Algorithm (GA), which are used to get the optimum solutions to these two single purpose functions as mentioned. The data of the optimization show that numerical results will greatly differ because of different initial values given with SQP. However, GA provides better numerical results by electing initial values randomly than SQP does. Furthermore, the rotor starts to move around in a shorter time when the system bears equivalent applied torque as the original system. Besides this, it takes less time to reach the same position with higher stable angular velocity of the rotor. It means that the system can complete its task by shorter time.
32
Yeh, Cheng-Hung, and 葉政宏. "A Linear Ultrasonic Motor with Chevron Clamp Actuators." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/14761320568555996772.
Full textAbstract:
碩士國立交通大學
機械工程系所
104
ABSTRACT This thesis presents a linear ultrasonic motor with the Chevron clamp stator which is used to propel a push rod forward and backward. Two orthogonal sinusoidal voltages are applied to two sets of piezoelectric elements adhered on the opposite faces of the V-shaped beam stator to excite two coupled flexural vibration modes. Two contact points located on the inner sides of the stator undergo an out-of-plane elliptical trajectory formed by the fundamental in-plane symmetric mode and the second out-of-plane mode. The rod was propelled via friction force, and its moving direction could be switched by phase lag or lead between two sinusoidal inputs. The target flexural modes were fine-tuned to approach a consistent resonant frequency at 29.2 kHz through adjusting dimensions of the stator. A flow chart based on finite-element analysis for modal coupling of the stator is summarized. Resonant frequencies of the stator are sensitive to the value of base screw torque. A robust design for the stator successfully gets rid of the frequency change. A prototype stator made of aluminum alloy and PZT-4 was use to carry out the performance tests. A single stator can achieve the highest linear speed up to 85 mm/s and the maximum thrust 0.539 N for a stainless steel push rod of diameter 8 mm and different lengths under an applied voltage of 300 Vp-p. The stator can be stacked to induce more thrust on the push rod. Keywords: linear ultrasonic motor, V-shaped beam stator, coupled vibration modes, out-of-plane oscillating motion, robust design
33
Chen, Xin-Liang, and 陳信良. "Study of energy transformation loss for ultrasonic motor." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/11454398113169415503.
Full textAbstract:
碩士中原大學
機械工程研究所
97
Elliptical motion of a particle of traveling wave generated by piezoelectric ceramics of the stator that drives the rotor by friction is usually seen in ultrasonic motors. The motor characteristic depends on the mechanical properties of the components stator, carriage and contact layer. Energy transformation efficiency between stator and carriage is the focus in this study. A comprehensive mathematical model describing the contact between stator and carriage by using the displacement functions in mechanics and the Kevin’s model for the contact layer as well as including the Coulomb’ friction effect is derived. Traveling wave is generated by using a set of Langevin vibrators to drive a beam. The carriage mounted on the beam can thus be moved by the traveling wave. Based upon such system, mathematical modeling is derived. Energy transmission efficiency is calculated about 36.41% by using the model and measured about 34.19% by experiment. The difference is about 2.22% between the theoretical computation and experiment. Compared to the previous study of 3.21% error by using the Strain energy method for modeling, the accuracy is improved.
34
李政良. "An Ultrasonic Motor Driven by Circumferential Ridge Waves." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/94236214129953283834.
Full textAbstract:
碩士國立交通大學
機械工程系所
95
This thesis develops a novel rotary ultrasonic motor (USM) driven by circumferential ridge waves around a piezoelectric tube which is polarized in radial direction. The proposed motor utilizes higher order circumferential modes to increase the number of contact points between motor stator and rotor. The wobble motion and poor torque output that frequently happen at those USM’s driven by the so-called beam mode are prevented and improved. The traveling ridge wave is generated by constructive interference of two equal-intensity standing waves of integer number circumferential modes induced by two sets of transducers. Both are located on the wall of the piezoelectric tube with an interval (n+1/4)�� apart and excited by two sinusoidal signals in 90o phase difference. A bi-dimensional finite element method and the commercial finite element code ANSYS are used to determine the dispersion curves of circumferential ridge waves. Response of traveling wave around the stator is simulated by using harmonic analysis of ANSYS. The change of the height of stator base has significant influence on the modal separation. Very good modal separation was achieved and verified by using laser Doppler vibrometer (LDV) and impedance measurement by modal sensors on the outer border of stator with network analyzer. Performance test results show that the prototype USM’s with axisymmetrically distributed electrodes have better performance than those with electrodes located on opposite sides of the piezoelectric tube. The motors based on resonant modes (1, 3) and (1, 4) achieve the maximum torque up to 6.9 and 22.6 mN-m and the maximum revolution speed at 200 and 334 rpm.
35
Lau, Jacky Ka Ki. "Development of a Linear Ultrasonic Motor with Segmented Electrodes." Thesis, 2012. http://hdl.handle.net/1807/42396.
Full textAbstract:
A novel segmented electrodes linear ultrasonic motor (USM) was developed. Using a planar vibration mode concept to achieve elliptical motion at the USM drive-tip, an attempt to decouple the components of the drive-tip trajectory was made. The proposed design allows greater control of the drive-tip trajectory without altering the excitation voltage.
Finite element analyses were conducted on the proposed design to estimate the performance of the USM. The maximum thrust force and speed are estimated to be 46N and 0.5370m/s, respectively.
During experimental investigation, the maximum thrust force and speed observed were 36N and 0.223m/s, respectively, at a preload of 70N. Furthermore, the smallest step achievable was 9nm with an 18μs impulse. Nevertheless, the proposed design allowed the speed of the USM to vary while keeping the thrust force relatively constant and allowed the USM to achieve high resolution without a major sacrifice of thrust force.
36
Cuevas, Gutiérrez Carlos Cuauhtémoc. "Modeling and experimental validation of an ultrasonic rotary motor." Thesis, 2007.
Find full textAbstract:
Ultrasonic motors are a new type of actuators that use mechanical vibrations of its stator to drive the rotor through frictional forces between the interface of the stator and rotor. Ultrasonic motors have recently been attracting considerable attention in industrial applications where high precision, fast response and high torque at low speed are desirable. In contrast to traditional electromagnetic motors, ultrasonic motors provide larger torque to volume ratio, silent operation, and compact design. Furthermore, its operation is not affected by electromagnetic fields, and the motor shaft remains braked when the power supply is removed. The commercial development of ultrasonic motors, however, has been limited primarily due to lack of complete models for the purpose of control. Consequently, the development of an accurate model based on the physical structure is extremely vital for controllers development. The present dissertation proposes a comprehensive model for the purpose of predicting the motor performance. A lumped-mass model of the stator is proposed to consider the coupling effects on the stator based on the flexibility influence coefficients, which are estimated from a finite element method. Moreover, the stator natural frequencies are obtained using modal analysis. Nonlinear tangential interface forces between the rotor and stator are incorporated into the driving torque function. A rotor model based on the Stribeck effect, Coulomb and viscous friction is also incorporated to describe the friction torque associated with the motor response. An extensive series of experiments have been designed together with a state-of-the-art test bench built at the laboratory of Concordia University. The validity of the proposed model was examined by comparing the model results with the measured data under different excitation conditions. The lumped-mass model is able to reproduce reasonably well the stator displacements and the excited modes when it is driven at different frequencies as a result of the stiffness coupling. Several rotor model parameters are identified by using the experimental data and a weighted error minimization function. From the results obtained in the present study, it is concluded that the proposed USM model can reproduce reasonably well the motor behavior to different excitations inputs such as step, ramp and harmonic excitations as well as the torque-speed characteristics. It is important to note that the developed model shows torque-speed hysteresis behavior, which has not been reported in literature. To experimentally confirm this new phenomenon, extensive experimental tests have been conducted to identify the torque-speed characteristics on the ultrasonic motor. It has been observed from experiments a clear torque-speed hysteresis in the ultrasonic motor attributed mainly to the friction drive principle at the contact interface. This behavior, however, has not been addressed previously. It is suggested that the lack of an appropriate instrumentation together with inadequate models have made very difficult to describe this phenomenon. On the other hand, the torque-speed hysteresis exhibits a high asymmetric behavior at low speed as a result of the friction torque produced by the Stribeck effect
37
楊明昌. "Design and Analysis of Ultrasonic Motor-shift driving type." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/13493253915598309433.
Full text
38
陳明男. "Design and Analysis of Notched Thin-disk Ultrasonic Motor." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/93820836338720982343.
Full textAbstract:
碩士國立清華大學
工程與系統科學系
92
This study aims at developing an out-off-plane mode ultrasonic motor with notched thin-disk vibrator. The vibrator made of a piezo buzzer (diameter is 31 mm, thickness is 0.2 mm) with asymmetric notched design can be excited by electric to produce an out-off-plane elliptical displacement motion to directly actuate a rotor with 2 mm axis high-speed rotating above a driving screw located at vibrator’s center. Structure-oriented design of the vibrator can let the driving frequency located in the main electric-mechanical coupling area of piezo material and thus promote the motor’s performance significantly. A thin disk with three notches distributed as an unequal triangle 110°-120°-130° and with another smaller plate below it composed together is proposed as best vibrator’s structural among many designs in this study. The design measures are: (a) take notches in place of fixed bolts to release vibrator’s boundary and concentrate energy on driving screw, (b) unequal triangle 110°-120°-130° notched design can promote the torque of driving screw, (c) combine another smaller plate under the vibrator can stabilize the operating direction and extend the preload range. Elliptical displacement motion on driving screw of the proposed vibrator is verified via numerical simulation by finite element analysis method. The mode frequency of proposed structure whether locates in the main electric-mechanical coupling area of piezo material is also checked by impedance analysis scanning with HP4194 and power amplifier. Finally, carbon powder lithography and experiment on performance of proposed motors are conducted to verify the design and simulation results. Experiences show that the performance enhances outstandingly for the three notches 110°-120°-130° double plates’ ultrasonic motor proposed in this study as compared to those three phases out-off-plane mode ultrasonic motor proposed by Ouyang [13], for example the power consumption decreases from 1.5 W to 1 W (saving about 33.3 %), the rotating speed promotes from 3000 rpm to 5300 rpm (increasing about 76.6 %), and the torque enhances from 0.5 mN-m to 1.28 mN-m (promoting about 156 %). The developed motor with thin structure is suitable for applying to slender 3C products and has advantage of cost.
39
Kuo, Jung Fang, and 郭榮芳. "Design and Testing of Edge-Driving Type Ultrasonic Motor." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/61876764368224899303.
Full text
40
Tang, Hsiang-Wen, and 湯祥雯. "Design and Analysis of a Novel Linear Ultrasonic Motor." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/98397681662451646923.
Full textAbstract:
碩士國立成功大學
機械工程學系碩博士班
93
This thesis is primarily concerned with the novel stator design of a traveling wave type linear ultrasonic motor and the analysis of its driving methods. Continuous traveling wave can be achieved on the stator by adopting the active phase match technique instead of the passive vibration absorption methods. In the study, the Bernoulli-Euler beam is discussed, and two driving mechanisms to generate traveling wave are presented. One method uses the beam’s lateral vibration theory associated with the traveling wave representation. The other method, assisted by finite element analysis, discusses the influence on the amplitude and phase differences of the lateral displacement of the surface particles due to the beam’s damping effect and the diverse locations between the particles when a traveling wave propagates on a semi-infinite beam. Furthermore, this thesis proposes two different actuating techniques with piezoelectric materials. One is a novel compact structure combining four piezoelectric patches and an aluminum beam, and the other is the actuation with Langevin vibrators. The finite element software ANSYS is used to analyze the feasibility of the proposed stator, which is then verified by experimental studies. The results demonstrate the feasibility of the proposed designs.
41
林樹鑫. "Design and Implementation of Driving Circuit for Ultrasonic Motor." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/29935318403084637629.
Full textAbstract:
碩士國立臺灣科技大學
機械工程技術研究所
86
The ultrasonic motor is a novel friction motor driven by mechanical vibration and consists of stator and a rotor. The stator consists of the piezoelectric ceramic ring, the elastic ring, and an adhesive to bond the two parts together. THe rotor is pressed on the stator by a disk spring. The ultrasonic motor has an excellent level of perfrmance and many useful features, including high torque, low speed, compactness in size, absence of electromagnetic interference, and quiet operation. These characteristics make ultrasonic motor possibly replace some conventional electromagnetic motor. When the stator is stimulated by a high-frequency power, it will vibrate and bring the rotor to take runs. In general, there are three ways of controlling the ultrasonic motor, namely by means of the applied voltage, the driving frequency, and the phase of position control. In this thesis a driving circuit which contains of two half-bridge resonant inverter with capacitor-parallel load is designed and a PID controller programmed by Visual Basic is proposed for the control of traveling wave ultrasonic motor. We analysis its driving performance by experimental results. On the basis of this investigation, the relationships between dynamic response and the characteristics of motor are estimated for further development.
42
Luo, Yi-wei, and 羅翊瑋. "Study of Recurrent Fuzzy Neural Network Controller for Ultrasonic Motor." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/25658787003659675392.
Full textAbstract:
碩士國立成功大學
工程科學系碩博士班
96
The traveling-wave ultrasonic motor (TWUSM) is a new type of actuator with significant features such as high holding torque at low speed range, high precision, fast dynamics, simple structure, compactness in size, no electromagnetic interference, silent drive, reversible controllability, and ability to maintain angle without electric power. Therefore, the TWUSM has been used in many practical areas such as industrial, medical, robotic, and automotive applications. However, the dynamic model of the TWUSM motor has the nonlinear characteristic and dead-zone problem which varies with many driving conditions. The USM parameters are nonlinear with time varying due to the temperature increasing and different motor drive operating conditions, such as driving frequency, source voltage, and load torque. In this thesis, both modeling and control aspects of the TWUSM are investigated. Based on experimental measurements with different conditions: driving frequency and input phase differences, a model general regression neural networks(MGRNN) structure is obtained. Moreover, the novel controller, recurrent fuzzy neural networks(RFNN), provides a way to derive uncertain dynamics with on-line learning. The GRNN is adopted to determine the dead-zone compensating input and decouple the frequency and phase commands via the FRNN. The experimental results of this thesis are shown a superior performance for the TWUSM. Furthermore, the results are provided to demonstrate the effectiveness of the proposed controller.
43
Lin, Chin-Tei, and 林錦德. "Analysis of active process of vibratory coupler type ultrasonic motor." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/28253692170293516641.
Full textAbstract:
碩士國立臺灣大學
機械工程學研究所
93
This study analyzes the motion characteristics of the vibrator and the slider of ultrasonic motor by using the vibrating model of the slider and the vibrator. The principle of impulse and momentum is used to derive the governing equations. During the process from separation to contact, the normal force between the contact surfaces equal to zero is used as the initial condition of separation. During the process from contact to separation, the vibrator impacting and then keeping contact with the slider is used as the initial condition of contact. Based on assumptions and phenomenon, the motion characteristics of the vibrator and the slider, and the normal force between the contact surfaces of the vibrator and the slider can be obtained. In the motion direction of the slider, the slider does not affect the motion of the vibrator, and the velocity of the slider can be obtained from the normal force. The finite difference method is used and the convergence conditions are set to obtain the detail characteristics of the ultrasonic motor, the displacement, the velocity, and the motion of the vibrator and the slider, the relation between the thrust, the velocity, and the parameters of the ultrasonic motors.
44
Yao, Xiang-Hann, and 姚翔瀚. "Dynamic Analysis of Contact Mechanism for Traveling-Wave Ultrasonic Motor." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/12437346952302570899.
Full textAbstract:
碩士國立中正大學
機械系
92
Ultrasonic motors have only been developed in recent two decades. Though the developing history is not long, many kinds of the ultrasonic motors have been developed and used in many fields such as medical engineering, focus system of digital cameras, the robotics, precise positioning and so on. One of these motors, traveling wave-ring type is the focus in this thesis. Unlike the traditional electromagnetic motors that are driven by electromagnetic force, ultrasonic motors are driven by the contact friction force between the stator and rotor. But the motor will turn into a non-linear and time-varying system due to this unique driving way. In this thesis, starting from the energy method, a mathematical model for stator electromechanical coupling model is constructed first. Then combining the contact mechanism and the rotor dynamics, an overall model is built to describe and predict the motor’s operating behavior. Besides, model validation and influences to the motor by changing input voltage amplitude, driving frequency and preload are performed. The cause of dead zone effect is also investigated.
45
HSU, FENG WEI, and 許風瑋. "Design and Analysis of a Hybrid-Type Piezoelectric Ultrasonic Motor." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/58470657058211987110.
Full textAbstract:
碩士國立雲林科技大學
機械工程系碩士班
90
Recently piezoelectric materials are extensively applied in industry. They have the properties to interchange between electric and mechanical energy. Piezoelectric elements have both actuating and sensing functions. Furthermore, it is inevitable for high-technology industry to request thin, small, light and motors with quick-response and non-electromechanical interference. Therefore, ultrasonic motors with piezoelectric actuator have substituted traditional electro-magnetic motors in many applications. Hybrid-type ultrasonic motor has the biggest driving force among the other types of motors. The aim of this research is to design a hybrid-type ultrasonic motor. Firstly, piezoelectric ceramics materials with higher electro-mechanical coupling factor（k）and piezoelectric constant（d）are chosen. Then high frequency voltages are input to produce better driving force. Secondly, stator and rotor with better response properties are designed by using driving theory of motors. After fabrication, frequencies are measured and compared with the results of FEM. Lastly, some ideas are provided to be as reference.
46
Jhang, Yun-Jyun, and 張昀竣. "Driver Circuit Design of a Circular Ridge-wave Ultrasonic Motor." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/28979096302943593965.
Full textAbstract:
碩士國立聯合大學
電子工程學系碩士班
105
This thesis aimed to design and compare two types of ultrasonic motor-driven circuits, and to determine the optimal resonant frequency for these ultrasonic motors with the help of the ANSYS simulation analysis tool. ANSYS was first used to build the finite element model (FEM) of an ultrasonic motor stator. This model had 20,935 elements and 25,712 nodal points. Next, the stress changes that the model undergoes when it is in its static, transient, and steady states were analyzed based on the ultrasonic motor stator's boundary conditions and load. Two-phase electrodes (A and B), which were produced by grinding carried out on the outer surface of a 2mm-thick piezoelectric tube, were then pasted onto a stainless steel base, thus creating an ultrasonic motor stator. The F(1,4) flexible traveling wave mode was excited on the motor stator's ridge when the drive circuit’s resonance frequency was 35.04 KHz. The mode changes from static to transient, and then toward a steady state, so as to allow the traveling wave to drive the rotor's positive and reverse rotations. The design of the drive circuit prioritized the phase separation of the original signal's waveform (the signal lagged by 90°), as this was the key to determining the positive and reverse rotations of the ultrasonic motor. With a TLP250 isolation driver IC and L6384E high voltage half bridge driver IC serving as the cores, a comparison was made and circuits were integrated, including interlock circuits, half-bridge inverters, and LLCC series-parallel load-resonant converters. To determine the ultrasonic motor stator's resonance frequency, the HP 4194A impedance analyzer was used to measure the stator's resistance curve and equivalent circuits, while the admittance curve generated from the PASCO 850 was used to verify the figures. The performance test for the ultrasonic motor showed that the L6384E-based drive circuit performed better, achieving a maximum drive voltage amplitude of 200 Vpp, a drive frequency of 35.04 KHz (with preload below 1Nt), a maximum torque of up to 22.6 mN-m, a maximum speed of 334 rpm, and a 25% increase in electromechanical conversion efficiency. The simulation and actual measurement results were consistent, confirming that the ultrasonic motor-driven circuits designed in this study have achieved their objectives.
47
Chen, Cheng-wei, and 陳政慰. "Analysis and Implementation of a Novel Single-Phase Ultrasonic Motor." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/04263498973438720064.
Full textAbstract:
碩士國立成功大學
機械工程學系碩博士班
95
Since 20th century, the development of optical communication and semiconductor industries prospered, bringing the precise positioning technique promotion. Owing to the trend of miniaturization of electronic products, manufacturing apparatus has required ever higher precision. Piezoelectric material exhibits an electromechanical coupled characteristic, and possesses precise accuracy from high frequency and small amplitude vibration. Piezoelectric actuators indeed provide a better selection for micro actuators or micro power generators, with the exception, however, of the electromagnetic actuator. The development tendency of ultrasonic motor is moving toward a single phase drive and miniaturization. This thesis proposes a novel single phase ultrasonic motor, which is characterized by a perpendicular electrode set of the actuator. It is simple in structure; just a 5×5×5mm3 cubic type in size, and requires only one input signal to excite the special vibration mode of the actuator. Experimental results show that the maximum velocity and thrust of the novel ultrasonic motor are 115mm/s and 3.72N in sequence, while its efficiency presently reaches 26.45%. This innovative design of the piezoelectric actuator has been employed in various applications, such as an active linear guide, micro grippers, and spherical ultrasonic motors etc.
48
Chung, Chung-Kuang, and 鍾重光. "A Rotary Ultrasonic Motor Actuated by Circumferentially Traveling Ridge Waves." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/32147456231426434201.
Full textAbstract:
碩士國立交通大學
機械工程系所
97
This thesis presents the development of an ultrasonic motor (USM) driven by circumferential ridge waves traveling along a disc-shaped stator. A stiffening ridge is provided around the outer periphery of the stator to reinforce its torsional rigidity. The piezoelectric annular disc adhered under the stator is excited by two sets of alternating voltages to generate two equal-intensity standing waves with 90 degree phase difference. Both standing wave modes interfere constructively with each other to induce a traveling wave whose direction can be switched by phase lag or lead between these modes. A number of projectors with 30 degree inclined surfaces deposit on the outer ridge to enlarge the amplitudes of traveling flexural waves. Design parameters of the stator including its outer diameter, thickness and height of the ridge are selected. Numerical analysis on dynamic response of the USM was carried out by use of finite element method. Based on modal separation results of the stator, the flexural mode F(1, 3) was considered to drive the USM. The optimal design has another objective seeking to maximize the aspect ratio of elliptical trajectory for the motion of a particle on the contact interface. The performance of a USM prototype was measured experimentally. The USM with stainless steel rotor coated by a wear resistant material, Teflon, achieves the maximum revolution speed and torque up to 101.6 rpm and 8.16 Mn-m, respectively. The presented USM has merits of high torque at low speed, stable output and quiet performance.
49
Hsieh, Yao-Jen, and 謝曜任. "Experimental study and design toward a ultrasonic motor servo drive." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/74780028261607916417.
Full text
50
Chao-PingLee and 李肇平. "Design and Implementation of Two-DOF Multi-layer Ultrasonic Motor." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/50946152336090745025.
Full text