DOCSLIB.ORG

Development of a Linear Ultrasonic Motor with Segmented Electrodes

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Development of a Linear Ultrasonic Motor with Segmented Electrodes Development of a Linear Ultrasonic Motor with Segmented Electrodes by Jacky Ka Ki Lau A thesis submitted in conformity with the requirements for the degree of Master of Applied Science Graduate Department of Mechanical and Industrial Engineering University of Toronto © Copyright by Jacky Ka Ki Lau 2012 Development of a Linear Ultrasonic Motor with Segmented Electrodes Jacky Ka Ki Lau Master of Applied Science Graduate Department of Mechanical and Industrial Engineering University of Toronto 2012 ABSTRACT 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. ii Acknowledgements I would like to thank everyone who helped me in to the completion of my thesis and my Master’s program. Special mention goes to the following people and organizations: My supervisor, Professor Ridha Ben Mrad, for his guidance and support throughout my project. He provided an excellent environment to conduct research and provided good advices and encouragement during my research. Professor James K. Mills, Professor Beno Benhabib, and Professor Goldie Nejat for their advices on the project through the CANRIMT UofT Node. Dr. Eswar Prasad and Dr. Sailu Namana of Sensor Technology Ltd. for their technical knowledge on piezoceramic. Members of MMDL, especially Alaeddin, Hirmand, Irman, James, Khalil, Mike, Sadegh, Sergey, Tae and Vainatey for their help, advices, friendship and making my studies enjoyable. Members of the CANRIMT UofT Node. My girlfriend and soul mate Aki for her support and understanding. Lastly, CANRIMT, NSERC and OGS for providing funding and financial support. iii Table of Contents Chapter 1 Introduction ......................................................................................................... 1 1.1 Background ................................................................................................................ 1 1.2 Literature Review on Piezoceramic Motor Technologies .......................................... 1 1.2.1 Piezoceramics and the Piezoelectric Effect ........................................................ 2 1.2.2 Quasi-Static Piezomotors .................................................................................... 3 1.2.3 Ultrasonic Motors (USMs) ................................................................................. 7 1.2.4 Summary ........................................................................................................... 15 1.3 Objectives and Motivation ....................................................................................... 16 1.4 Thesis Outline .......................................................................................................... 16 Chapter 2 RmMT Actuator Arrangement Concepts .......................................................... 18 Chapter 3 Motor Design .................................................................................................... 22 3.1 Background .............................................................................................................. 22 3.2 Assessment of Available USM Design and Development of the Novel Segmented Electrodes Motor Design ..................................................................................................... 24 3.2.1 Confirmation of the E(3,1) Vibration Mode ..................................................... 24 3.2.2 Piezoceramic Material Selection ....................................................................... 29 3.2.3 Analysis of Initial USM Concepts .................................................................... 30 3.2.4 Simple Dynamic Model Development .............................................................. 33 3.2.5 Geometrical Optimization To Characterize Performance of USM Based on the E(3,1) Concept ................................................................................................................. 36 3.2.6 New Segmented Electrodes Concept ................................................................ 38 Chapter 4 Experimental Assessment of Prototype ............................................................ 48 4.1 Motor Integration ..................................................................................................... 48 4.2 Static Analysis .......................................................................................................... 49 4.3 Experimental Setup for Speed, Force, and Resolution Testing ................................ 51 4.4 Assessment of Motor Performance Using One Amplifier ....................................... 54 4.5 Assessment of Motor Performance Using Two Amplifiers ..................................... 58 Chapter 5 Discussion and Conclusions ............................................................................. 62 5.1 Summary .................................................................................................................. 62 5.2 Recommendations and Future Research .................................................................. 63 References ............................................................................................................................... 64 Appendix A : Geometric Optimization Supplementary Data ............................................ 68 Appendix B : Segmented Electrodes Concept Supplementary Data ................................. 69 Appendix C : Segmented Electrodes Concept 2D FE Dynamic Analysis ......................... 71 Appendix D : Differential Electrode Voltage Concept ...................................................... 76 Appendix E : Impendence Analysis Supplementary Data ................................................ 81 Appendix F : Supplementary Data .................................................................................... 84 Appendix G : Piezoceramic and USM Drawings .............................................................. 86 iv List of Figures Figure 1.1: (a) No electrical field present; (b) With electrical field present. ............................ 2 Figure 1.2: PiezoLEGS® motors working principle [4]. .......................................................... 5 Figure 1.3: PiezoLEGS® motors working principle [4]. .......................................................... 5 Figure 1.4: Inchworm® motors working principle [4]. ............................................................ 6 Figure 1.5: SIDM motor working principle [4]. ....................................................................... 7 Figure 1.6: Sample standing-wave USM working principle [4]. .............................................. 8 Figure 1.7: Longitudinal and Bending Hybrid Motor using BLTs [21]. .................................. 9 Figure 1.8: Piezoceramic Hollow Cylinder working principle [4]. ........................................ 10 Figure 1.9: Standing-wave Rotary USM [24]. ........................................................................ 10 Figure 1.10: Actuator model and drive-tip motion path [26]. ................................................. 11 Figure 1.11: Nanomotion motor and its working principle [28]. ............................................ 12 Figure 1.12: Physik Instrumente motor and its working principle [20]. ................................. 13 Figure 1.13: Linear motor driven by BLTs [27]. .................................................................... 14 Figure 1.14: Rotary traveling-wave USM working principle [4]. .......................................... 15 Figure 2.1: RmMT concept drawing. ...................................................................................... 18 Figure 2.2: Linear Actuator Concepts for RmMT. ................................................................. 19 Figure 2.3: Concept #1 of curvilinear/annular actuator driving the vertical columns. ........... 20 Figure 2.4: Concept #2 of curvilinear/annular actuator driving the vertical columns. ........... 20 Figure 2.5: Linear actuator in (a) linear and (b) curvilinear application. ............................... 21 Figure 3.1: Piezo-plate and coordinate system used. .............................................................. 24 Figure 3.2: Coordinate system used with equations (3.3) and (3.4). ...................................... 25 Figure 3.3: Superposition of natural vibration and the stress-strain effect. ............................ 26 Figure 3.4: E(3,1) vibration mode at (a) 60.193 kHz and (b) 67.772 kHz. ............................ 27 Figure 3.5: y-displacement distribution (a) 60.193 kHz and (b) 67.772 kHz. ........................ 27 Figure 3.6: Drive-tip displacement results from harmonic analysis. ...................................... 27 Figure
Load more

Recommended publications
  • Research and Development of a High-Resolution Piezoelectric Rotary Stage
    KAUNAS UNIVERSITY OF TECHNOLOGY IGNAS GRYBAS RESEARCH AND DEVELOPMENT OF A HIGH-RESOLUTION PIEZOELECTRIC ROTARY STAGE Doctoral Dissertation Technological Sciences, Mechanical Engineering (09T) 2017, Kaunas This doctoral dissertation was prepared at Kaunas University of Technology, Institute of Mechatronics during the period of 2013–2017. The studies were supported by the Research Council of Lithuania. Scientific Supervisor: Habil. Dr. Algimantas Bubulis, (Kaunas University of Technology, Technological Sciences, Mechanical Engineering, 09T). Doctoral dissertation has been published in: http://ktu.edu Editor: Dovilė Dumbrauskaitė (Publishing Office “Technologija”) © I. Grybas, 2017 ISBN xxxx-xxxx The bibliographic information about the publication is available in the National Bibliographic Data Bank (NBDB) of the Martynas Mažvydas National Library of Lithuania KAUNO TECHNOLOGIJOS UNIVERSITETAS IGNAS GRYBAS AUKŠTOS SKYROS PJEZOELEKTRINIO SUKAMOJO STALIUKO KŪRIMAS IR TYRIMAS Daktaro disertacija Technologiniai mokslai, mechanikos inžinerija (09T) 2017, Kaunas Disertacija rengta 2013–2017 metais Kauno technologijos universiteto Mechatronikos institute. Mokslinius tyrimus rėmė Lietuvos mokslo taryba. Mokslinis vadovas: Habil. dr. Algimantas Bubulis (Kauno technologijos universitetas, technologiniai mokslai, mechanikos inžinerija, 09T). Interneto svetainės, kurioje skelbiama disertacija, adresas: http://ktu.edu Redagavo: Dovilė Dumbrauskaitė (leidykla “Technologija“) © I. Grybas, 2017 ISBN xxxx-xxxx Leidinio bibliografinė informacija pateikiama
    [Show full text]
  • A Review of Application and Development Trends in Ultrasonic Motors
    ES Mater. Manuf., 2021, 12, 3-16 ES Materials and Manufacturing DOI: https://dx.doi.org/10.30919/esmm5f933 A Review of Application and Development Trends in Ultrasonic Motors Xiaoniu Li, Zhiyi Wen, Botao Jia, Teng Cao, De Yu and Dawei Wu* Abstract The structure and performance of ultrasonic motors have gradually improved with the emergence of new materials, techniques, and structural forms. Therefore, the application scope of this technology is also expanding, especially in the field of high-end equipment. This paper conducts a review of research on the application status and progress at the frontier of research on ultrasonic motors. A summary and classification of both the status of application and cutting-edge research progress are presented, including the use of ultrasonic motors in aerospace, precision, biomedical and optical engineering and the influence on ultrasonic motor design resulting from the breakthrough in advanced processing and preparation technology, structural and functional integration technology, low voltage drives and open-loop control systems. Moreover, the performance of products developed with the aid of ultrasonic motors and representative devices are compared; and state of the art ultrasonic motor designs are discussed and summarized. Finally, potential future research efforts and prospects are highlighted. Keywords: Ultrasonic motors; applications; research progress; piezoelectric ceramics. Received date: 26 October 2020; Accepted date: 3 December 2020. Article type: Review article. 1. Introduction piezoelectric ceramics, micro-electro-mechanical systems Ultrasonic motors (USMs) involve the use of inverse (MEMS) micro-machining and 3D printing additive piezoelectric effects in piezoelectric ceramic materials to manufacturing technology.[10,11] generate rotation or linear motion by controlling the Until now, such advantages have enabled successful mechanical deformation.
    [Show full text]
  • Meshing Drive Mechanism of Double Traveling Waves for Rotary Piezoelectric Motors
    mathematics Article Meshing Drive Mechanism of Double Traveling Waves for Rotary Piezoelectric Motors Dawei An , Weiqing Huang *, Weiquan Liu, Jinrui Xiao, Xiaochu Liu and Zhongwei Liang School of Mechanical and Electrical Engineering, Guangzhou University, Guangzhou 510006, China; [email protected] (D.A.); [email protected] (W.L.); [email protected] (J.X.); [email protected] (X.L.); [email protected] (Z.L.) * Correspondence: [email protected] Abstract: Rotary piezoelectric motors based on converse piezoelectric effect are very competitive in the fields of precision driving and positioning. Miniaturization and larger output capability are the crucial design objectives, and the efforts on structural modification, new materials application and optimization of control systems are persistent but the effectiveness is limited. In this paper, the resonance rotor excited by stator is investigated and the meshing drive mechanism of double traveling waves is proposed. Based on the theoretical analysis of bending vibration, the finite element method (FEM) is used to compare the modal shape and modal response in the peripheric, axial, and radial directions for the stator and three rotors. By analyzing the phase offset and vibrational orientation of contact particles at the interface, the principle of meshing traveling waves is discussed graphically and the concise formula obtaining the output performance is summarized, which is analogous with the principles of gear connection. Verified by the prototype experimental results, the speed of the proposed motor is the sum of the velocity of the stator’s contact particle and the resonance rotor’s Citation: An, D.; Huang, W.; Liu, W.; contact particle, while the torque is less than twice the motor using the reference rotor.
    [Show full text]
  • Dynamic Analysis of a Piezoelectric Ultrasonic Motor with Application to the Design of a Compact High-Precision Positioning Stage
    Department of Precision and Microsystems Engineering Dynamic analysis of a piezoelectric ultrasonic motor With application to the design of a compact high-precision positioning stage Name: Teunis van Dam Report no: ME 11.036 Coach: R. Ellenbroek Professor: prof. ir. R. H. Munnig Schmidt Specialization: Mechatronics Type of report: Masters Thesis Date: Delft, November 22, 2011 2 3 Preface This thesis describes the work I have done at Mapper Lithography B.V. in Delft, as a final project for my masters Precision and Microsystems Engineering at Delft University of Technology, faculty 3mE. This project is part of the process of designing a high-precision linear positioning stage for a wafer scanner using electron beam lithography. The first part of my work is focused on the conceptual design of this stage, in which choosing the actuator type plays a dominant role. The second and largest part is focused on detailed analysis of the dynamic behavior of the selected actuator, a piezoelectric ultrasonic motor, by building a simulation model of the motor and validating this model by experiments. I want to thank my professor, Robert Munnig Schmidt, and my supervisor at Mapper Lithography, Rogier Ellenbroek, for their support and valuable feedback on my work. Furthermore I would like to thank my design leader at Mapper Lithography, Jerry Peijster, and my other colleagues, for granting me this opportunity and for the pleasant cooperation. Teunis van Dam Contents 1 Introduction 6 1.1 General introduction . 6 1.2 Machine description and problem statement . 6 1.3 Overviewofcontents......................................... 7 2 Stage requirements 9 2.1 Functionality .
    [Show full text]
  • Actuator 2006: Ultrasonic Piezoelectric Motor
    White Paper for ACTUATOR 2006 Survey of the Various Operating Principles of Ultrasonic Piezomotors K. Spanner Physik Instrumente GmbH & Co. KG, Karlsruhe, Germany Abstract: Piezoelectric ultrasonic motors have been known for more than 30 years. In recent years especially, a large number of different designs have been developed, both for rotation and linear drives. This talk will provide a definition of piezoelectric ultrasonic motors and classify their different operating principles. The operation of each type will then be explained, commercially available implementations described and the advantages and disadvantages of each discussed. The goal is to provide an international perspective on the current state of development of piezoelectric ultrasonic motors. Keywords: piezomotor, PZT, ultrasonic motor, travelling-wave, standing-wave, piezoelectric actuator Introduction There is today a large variety of drive designs arranged that their vibrational motion was exploiting motion obtainable from the inverse converted into rotary motion of a shaft and gear. piezoelectric effect. Ultrasonic piezomotors have a very special place among such devices. These motors achieve high speeds and drive forces, while still permitting the moving part to be positioned with very high accuracy. Such characteristics make these motors of great interest for many companies Fig. 1 Piezoelectric motor of L.W Williams and who make precision devices for which these drives Walter J. Brown [1]. are, in many cases, irreplaceable. Since then, there have been numerous Piezoelectric Motors developments in the field of piezoelectric motors. They can be classified by working principle, Piezoelectric actuators are electro-mechanical geometry, or the type of oscillation excited in the energy transducers; they transform electrical energy piezoceramic.
    [Show full text]
  • Piezoelectric Inertia Motors—A Critical Review of History, Concepts, Design, Applications, and Perspectives
    Review Piezoelectric Inertia Motors—A Critical Review of History, Concepts, Design, Applications, and Perspectives Matthias Hunstig Grube 14, 33098 Paderborn, Germany; [email protected] Academic Editor: Delbert Tesar Received: 26 November 2016; Accepted: 18 January 2017; Published: 6 February 2017 Abstract: Piezoelectric inertia motors—also known as stick-slip motors or (smooth) impact drives—use the inertia of a body to drive it in small steps by means of an uninterrupted friction contact. In addition to the typical advantages of piezoelectric motors, they are especially suited for miniaturisation due to their simple structure and inherent fine-positioning capability. Originally developed for positioning in microscopy in the 1980s, they have nowadays also found application in mass-produced consumer goods. Recent research results are likely to enable more applications of piezoelectric inertia motors in the future. This contribution gives a critical overview of their historical development, functional principles, and related terminology. The most relevant aspects regarding their design—i.e., friction contact, solid state actuator, and electrical excitation—are discussed, including aspects of control and simulation. The article closes with an outlook on possible future developments and research perspectives. Keywords: inertia motor; stick-slip motor; smooth impact drive; piezeoelectric motor; review 1. Introduction Piezoelectric actuators have long been used in diverse applications, especially because of their short response time and high resolution. The major drawback of these solid state actuators in positioning applications is their small stroke: actuators made of state-of-the-art lead zirconate titanate (PZT) ceramics only reach strains up to 2 . A typical piezoelectric actuator with 10 mm length thus reaches a maximum stroke of only 20 µm.h Bending actuator designs [1] and other mechanisms [2] can increase the stroke at the expense of stiffness and actuation force ([3]; [4] (pp.
    [Show full text]
  • Brushless DC Electric Motor
    Please read: A personal appeal from Wikipedia author Dr. Sengai Podhuvan We now accept ₹ (INR) Brushless DC electric motor From Wikipedia, the free encyclopedia Jump to: navigation, search A microprocessor-controlled BLDC motor powering a micro remote-controlled airplane. This external rotor motor weighs 5 grams, consumes approximately 11 watts (15 millihorsepower) and produces thrust of more than twice the weight of the plane. Contents [hide] 1 Brushless versus Brushed motor 2 Controller implementations 3 Variations in construction 4 AC and DC power supplies 5 KM rating 6 Kv rating 7 Applications o 7.1 Transport o 7.2 Heating and ventilation o 7.3 Industrial Engineering . 7.3.1 Motion Control Systems . 7.3.2 Positioning and Actuation Systems o 7.4 Stepper motor o 7.5 Model engineering 8 See also 9 References 10 External links Brushless DC motors (BLDC motors, BL motors) also known as electronically commutated motors (ECMs, EC motors) are electric motors powered by direct-current (DC) electricity and having electronic commutation systems, rather than mechanical commutators and brushes. The current-to-torque and frequency-to-speed relationships of BLDC motors are linear. BLDC motors may be described as stepper motors, with fixed permanent magnets and possibly more poles on the rotor than the stator, or reluctance motors. The latter may be without permanent magnets, just poles that are induced on the rotor then pulled into alignment by timed stator windings. However, the term stepper motor tends to be used for motors that are designed specifically to be operated in a mode where they are frequently stopped with the rotor in a defined angular position; this page describes more general BLDC motor principles, though there is overlap.
    [Show full text]
  • Examination of High-Torque Sandwich-Type Spherical Ultrasonic Motor Using with High-Power Multimode Annular Vibrating Stator
    actuators Article Examination of High-Torque Sandwich-Type Spherical Ultrasonic Motor Using with High-Power Multimode Annular Vibrating Stator Ai Mizuno 1,*, Koki Oikawa 1, Manabu Aoyagi 1,* ID , Hidekazu Kajiwara 1, Hideki Tamura 2 and Takehiro Takano 2 1 Graduate School of Engineering, Muroran Institute of Technology, 27-1, Mizumoto, Muroran, Hokkaido 050-8585, Japan; [email protected] (K.O.); [email protected] (H.K.) 2 Department of Information and Communication Engineering, Tohoku Institute of Technology, Sendai, Miyagi 982-8577, Japan; [email protected] (H.T.); [email protected] (T.T.) * Correspondence: [email protected] (A.M.); [email protected] (M.A.); Tel.: +81-143-46-5504 (M.A.) Received: 5 January 2018; Accepted: 20 February 2018; Published: 27 February 2018 Abstract: Spherical ultrasonic motors (SUSMs) that can operate with multiple degrees of freedom (MDOF) using only a single stator have high holding torque and high torque at low speed, which makes reduction gearing unnecessary. The simple structure of MDOF-SUSMs makes them useful as compact actuators, but their development is still insufficient for applications such as joints of humanoid robots and other systems that require MDOF and high torque. To increase the torque of a sandwich-type MDOF-SUSM, we have not only made the vibrating stator and spherical rotor larger but also improved the structure using three design concepts: (1) increasing the strength of all three vibration modes using multilayered piezoelectric actuators (MPAs) embedded in the stator, (2) enhancing the rigidity of the friction driving portion of the stator for transmitting more vibration force to the friction-driven rotor surface, and (3) making the support mechanism more stable.
    [Show full text]
  • Robust Position Control of Ultrasonic Motor Considering Dead-Zone
    Robust Position Control of Ultrasonic Motor Considering Dead-Zone Shogo Odomari1, Araz Darba1, Kosuke Uchida1, Tomonobu Senjyu1, and Atsushi Yona1 1Department of Electrical and Electronics Engineering, University of the Ryukyus, Japan E-mail: [email protected] Abstract— Intrinsic properties of ultrasonic motor (high torque for low speed, high static torque, compact S1 D1 S3 D3 C L1 USM Load in size, etc.) offer great advantages for industrial ap- 1 Va plications. However, when load torque is applied, dead- E zone occurs in the control input. Therefore, a nonlinear Vb y controller, which considers dead-zone, is adopted for ul- C2 L 2 trasonic motor. The state quantities, such as acceleration, S2 D2 S4 D4 RE speed, and position are needed to apply the nonlinear controller for position control. However, rotary encoder causes quantization errors in the speed information. This − f MOS FET Micro ye paper presents a robust position control method for ultra- driver φ computer sonic motor considering dead-zone. The state variables y for nonlinear controller are estimated by a Variable r e Structure System(VSS) observer. Besides, a small, low Personal cost, and good response nonlinear controller is designed computer by using a micro computer that is essential in embedded system for the developments of industrial equipments. Fig. 1 Drive system of USM. Effectiveness of the proposed method is verified by the experimental results. 150 Va Vb 100 I. INTRODUCTION B V , [V] 50 A In recent years, ultrasonic motor(USM) is gaining V 0 attention as it has good characteristics and is small in size.
    [Show full text]
  • Model 6000 Inchworm Motor Controller Instruction Manual
    MODEL 6000 'nchworm%otor Controller 'nstruction Manual CONTENTS PAGE Chapter 1 - Introduction Chapter 2 - System Overview Chapter 3 - Installation Location 3-1 Connecting Inchworm Motors 3-1 Connecting The Model 6003 Joystick 3-1 Interfacing To Encoders 3-1 Selecting Display Resolution 3-2 Une Voltage Selection 3-2 Line Voltage Conversion 3-2 Chapter 4 - Operation Front Panel 4-1 Model 6003 Joystick 4-2 Model 6005 Handset 4-3 Chapter 5 - Interfacing Level I TTL Open Loop Interface 5-1 Level I Closed Loop Interface 5-4 Level II Closed Loop Interface 5-6 Function Table 5-9 Extended Function Table 5-10 Changes Effecting All 6000 Controllers 5-13 Chapter 6 - Trouleshooting Appendix A - Specifications Appendix B - Hardware Conflguration Chapter 1 - Introduction Burleigh Instruments Inc. thanks you for choosing INITIAL TEST our Model 6000 Inchworm Motor ControUer. It's design has been optimized for the operation of IMPORTANT: Before plugging in the line cord Burleigh's 700 series and LTS/LTO series Inchworm confirm that the rear panel voltage selector position Motors. matches the available line voltage. Incorrect settmg can cause permanent damage to the system. Burleigh Instruments introduced Inchworm Motor systems in the early 1970's. These unique Do NOT connect an Inchworm Motor to the piezoelectric devices produce ultra-high resolution Controller until you have read the Installation linear motion with no backlash or leadscrew errors. section of this manual and followed the instructions They have been found indispensable in a wide range contained therein. This initial test is performed with of applications including fiber optic alignment, disk nothing but the line cord connected to the Controller.
    [Show full text]
  • Modeling PM Rotary-Linear Motors with Twin-Stator Using 3D FEMM" (2010)
    Louisiana State University LSU Digital Commons LSU Master's Theses Graduate School 2010 Modeling PM Rotary-Linear Motors with Twin- Stator Using 3D FEMM Oleksandr Dobzhanskyi Louisiana State University and Agricultural and Mechanical College, [email protected] Follow this and additional works at: https://digitalcommons.lsu.edu/gradschool_theses Part of the Electrical and Computer Engineering Commons Recommended Citation Dobzhanskyi, Oleksandr, "Modeling PM Rotary-Linear Motors with Twin-Stator Using 3D FEMM" (2010). LSU Master's Theses. 2519. https://digitalcommons.lsu.edu/gradschool_theses/2519 This Thesis is brought to you for free and open access by the Graduate School at LSU Digital Commons. It has been accepted for inclusion in LSU Master's Theses by an authorized graduate school editor of LSU Digital Commons. For more information, please contact [email protected]. MODELING PM ROTARY-LINEAR MOTORS WITH TWIN-STATOR USING 3D FEMM A Thesis Submitted to the Graduate Faculty of the Louisiana State University and Agricultural and Mechanical College in partial fulfillment of the requirements for the degree of Master of Science in Electrical Engineering in The Department of Electrical & Computer Engineering by Oleksandr Dobzhanskyi Bachelor of Industrial Engineering, Kiev National University of Construction and Architecture, 2006; Master of Industrial Engineering, Kiev National University of Construction and Architecture, 2007 December, 2010 ACKNOWLEGEMENTS I would like to thank my advisor prof. E. Mendrela for guiding me through my work so that my thesis would be a contribution to Electrical Engineering as a science. His encouragement and ability to motivate inspired me for becoming a professional in Power area. I am very grateful to prof.
    [Show full text]
  • Synthesis and Characterization of Zno Finewires for the Conceptual Design of a Mechanical Battery
    ADVERTIMENT. Lʼaccés als continguts dʼaquesta tesi queda condicionat a lʼacceptació de les condicions dʼús establertes per la següent llicència Creative Commons: http://cat.creativecommons.org/?page_id=184 ADVERTENCIA. El acceso a los contenidos de esta tesis queda condicionado a la aceptación de las condiciones de uso establecidas por la siguiente licencia Creative Commons: http://es.creativecommons.org/blog/licencias/ WARNING. The access to the contents of this doctoral thesis it is limited to the acceptance of the use conditions set by the following Creative Commons license: https://creativecommons.org/licenses/?lang=en Synthesis and characterization of ZnO finewires for the conceptual design of a mechanical battery Ph. D. Thesis written by Oscar Gilberto Súchil Pérez Under the supervision of Francesc Torres and Gabriel Abadal Electronic Circuits and Systems and NOEMS for energy laboratory Bellaterra (Cerdanyola del Vallès), May 2017 Synthesisii and characterization of ZnO finewires for the conceptual design of a me chanical battery The undersigned, Dr, Francesc Torres and Gabriel Abadal, Professors of the Electronic Engineering Department (Engineering School) of the Universitat Autònoma de Barcelona, CERTIFY: That the thesis entitled “Synthesis and characterization of ZnO finewires for the conceptual design of a mechanical battery” has been written by Oscar Gilberto Súchil Pérez under their supervision, in fulfillment of the requirements for the PhD degree of Electronic Engineering. And hereby to acknowledge the above, sign the present. Frances Torres Gabriel Abadal Bellaterra (Cerdanyola del vallès, May 2017) ii Acknowledgments Firstly, a special acknowledgment to my father, who supports me from the beginning for start this journey in the research field.
    [Show full text]