DOCSLIB.ORG

UCLA Electronic Theses and Dissertations

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
UCLA Electronic Theses and Dissertations UCLA UCLA Electronic Theses and Dissertations Title Pediatric Mechanical Circulatory Support Applications for Frequency-Leveraged Piezoelectric Hydraulic Pumps Permalink https://escholarship.org/uc/item/34b4t1zg Author Valdovinos, John Publication Date 2014 Peer reviewed|Thesis/dissertation eScholarship.org Powered by the California Digital Library University of California UNIVERSITY OF CALIFORNIA Los Angeles Pediatric Mechanical Circulatory Support Applications for Frequency-Leveraged Piezoelectric Hydraulic Pumps A dissertation submitted in partial satisfaction of the requirements for the degree Doctor of Philosophy in Biomedical Engineering by John Valdovinos 2014 © Copyright by John Valdovinos 2014 ABSTRACT OF DISSERTATION Pediatric Mechanical Circulatory Support Applications for Frequency-Leveraged Piezoelectric Hydraulic Pumps By John Valdovinos Doctor of Philosophy in Biomedical Engineering University of California, Los Angeles, 2014 Professor Gregory P. Carman, Co-Chair Professor Daniel S. Levi, Co-Chair While the development of ventricular assist devices for the pediatric population has grown and helped these patients in bridge-to-transplantation, the motors used for these devices have remained electromagnetic. Because the physical space requirements for pediatric ventricular assist devices (PVADs) implantation are smaller in children, these motors are susceptible to decreased power output and efficiency as they are scaled down. Piezoelectric actuators, which scale down favorably in terms of power output and efficiency, have yielded novel compact piezoelectric hydraulic pumps in the aerospace industry. The focus of this research is on the development of a ventricular assist driver powered by a miniature piezoelectric hydraulic pump (PHP). This driver is designed to drive a working fluid to an extracorporeal ventricular assist ii device, also called a blood pump, which has been fabricated at UCLA for bridge-to- transplantation mechanical support. The majority of the focus for this dissertation was on developing a fundamental understanding of the factors that affect the transduction of power from a small scale piezoelectric to the human circulation. Two piezoelectric pumps were developed and mechanically tested. An 8.1 W/kg pump with 3% efficient pump was fabricated. In-vitro studies were carried out to show that the piezoelectric pump could produce physiological pressure and flow rate waveforms for pediatric patients. While the driver could only provide 1 L/min flow to the mock circulation, these studies have laid the groundwork to optimize piezoelectric pump technology for mechanical support applications in the pediatric community. iii The dissertation of John Valdovinos is approved. Christopher S. Lynch Jacob J. Schmidt Daniel S. Levi, Committee Co-Chair Gregory P. Carman, Committee Co-Chair University of California, Los Angeles 2014 iv To my parents, Juan and Esther, my sister, Marissa, and my fiancée, Irene. v Table of Contents Chapter 1: Introduction ................................................................................................................1 1.1 Motivation and Background ...................................................................................................1 1.2 Hypothesis ..............................................................................................................................3 1.3 Summary of Chapters .............................................................................................................4 Chapter 2: Mechanical Circulatory Support Literature Review .............................................7 2.1 Human Cardiovascular Physiology and Heart Failure ..........................................................7 2.2 Overview of Mechanical Circulatory Support .....................................................................12 2.3 Pediatric MCS Devices .......................................................................................................17 2.4 Pulsatile Blood Pump Driver Design ..................................................................................19 2.5 MCS In Vitro and In Vivo Testing ......................................................................................24 2.6 Summary .............................................................................................................................26 Chapter 3: Piezoelectric Hydraulic Pump Literature Review ................................................28 3.1 Piezoelectric Transducer Background .................................................................................28 3.2 Piezoelectric Actuators and Motors .....................................................................................35 3.3 Piezoelectric Hydraulic Pumps ............................................................................................41 3.4 Summary ..............................................................................................................................51 Chapter 4: Piezohydraulic Pump Ventricular Assist Device Driver: Feasibility Study ......53 4.1 Theoretical Analysis for Design Requirements....................................................................53 4.2 Experimental Setup ..............................................................................................................61 4.3 Results and Discussion .........................................................................................................65 4.4 Summary ..............................................................................................................................72 Chapter 5: Miniature Piezohydraulic Pump Design, Modeling, and Mechanical Testing ..74 5.1 Piezohydraulic Pump Design and Components ...................................................................74 5.2 Three Dimensional Piezoelectric Hydraulic Pump Model ...................................................96 5.3 Piezohydraulic Pump Prototype Testing and Results ........................................................112 5.4 Summary ............................................................................................................................128 Chapter 6: Pediatric Blood Pump Design and Piezohydraulic Driver ................................130 6.1 Pulsatile Blood Pump Design .............................................................................................130 6.2 Piezoelectric Hydraulic Ventricular Assist Device Driver Design ....................................145 6.3 In-vitro Testing and Results ...............................................................................................147 vi 6.5 Summary ............................................................................................................................154 Chapter 7: Fontan Mechanical Circulatory Support Research ...........................................155 7.1 Fontan Physiology Background ........................................................................................156 7.2 Fontan Assist Materials and Methods ...............................................................................158 7.3 Results and Discussion .......................................................................................................162 7.4 Summary ............................................................................................................................171 Conclusion .................................................................................................................................172 APPENDIX A: Piezohydraulic Pump Drawings ...................................................................174 APPENDIX B: Blood Pump Drawings ....................................................................................185 BIBLIOGRAPHY ......................................................................................................................190 vii List of Figures Figure 1-1. Development of a piezohydraulic driven pediatric ventricular assist device driver proposed in this dissertation.............................................................................................................4 Figure 2-1. (a) Left atrial and ventricular pressure and ventricular volume produced by the left heart during the cardiac cycle and (b) the corresponding left ventricular pressure-volume curve .9 Figure 2-2. (a) Effect of increased ventricular preload (filling) on the ventricular pressure- volume curve and (b) the effect of increased ventricular afterload (back pressure) on the ventricular pressure-volume curve ................................................................................................10 Figure 2-3. Comparison of a normal heart with normal and a heart with dilated cardiomyopathy ........................................................................................................................................................11 Figure 2-4. (a) Drawings of the first clinically used paracorporeal pneumatically actuated pulsatile VAD from Thoratec (PVAD) (b) images of the developed device ................................14 Figure 2-5. (a) Cross-sectional view of an axial continuous flow VAD (b) centrifugal continuous flow VAD [17], (c) the Jarvik 2000 axial flow VAD, and (d) the Heart-Ware HVAD centrifugal pump .............................................................................................................................................15 Figure 2-6. (a) Performance curve for a dynamic type pump and (b) performance
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]
  • 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]
  • 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]
  • 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.
    [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]
  • 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]
  • Abrasion 298, 307, 310, 316 ABS 217 AC Chopper Converter 146 AC
    Index abrasion 298, 307, 310, 316 BLDC motor 104, 105, 132, 147, 148, ABS 217 152 AC chopper converter 146 blocking force 262,281 AC commutator motor 93 Bode-diagram 165 AC induction motor 146 boost converter 61 AC magnet 141 bootstrap driver 42 AC motor 113, 115, 126, 216 brake 312, 316 achievable accuracy 177 breakdown field 82 active vibration absorber 16 breakdown voltage 24, 36 active-clamping circuit 51 breakthrough voltage 22, 25 adaptive control, AC 4 Bridgman method 278 adaptronics 5, 6 brushes 92,94 air-gap windings 91 Buck-topology 61 AlNiCo magnet 96 amplification system 15 canned motor 128 amplified piezo actuator 266 capacitor 118 analogue amplifier 271 capacitor AC motor 120 anti-lock braking system 177, 217 cascade-circuit 113 application areas 20 charge control 270, 277 asynchronous point-to-point controls charge pump 44, 80 206 cheap motors 86 axial piston motor 181 chopper 93, 98 clamping force 262 backdrop 227 class-A amplifier 272 backward brush shift 92 class-C amplifier 272 Baker clamp 26 classification of drive circuits 38 BCD technology 80 claw-pole construction 152 bell-rotor 97 claw-pole principle 104 bell-type motor 95 claw-pole stator 128 bending element 264 claw-pole type 131 bi-metallic actuator 234 close-loop position control 114 bimetal effect 320 closed loop control 4, 85, 237 bimetals 6 clutch 312, 317 Bingham body 293, 307 collocation 8 Bingham model 295 commutator 92 bipolar connection 106, 137 compensation filter 11, 13 bipolar power transistors 24 complementary drive stage 39 bipolar transistor 21
    [Show full text]
  • A Novel Low-Frequency Piezoelectric Motor Modulated by an Electromagnetic Field
    actuators Article A Novel Low-Frequency Piezoelectric Motor Modulated by an Electromagnetic Field Jichun Xing * and Yong Qin School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China; [email protected] * Correspondence: [email protected] Received: 28 August 2020; Accepted: 11 September 2020; Published: 13 September 2020 Abstract: For expanding the driving mode of the piezoelectric motor, a novel piezoelectric motor modulated by a magnetic field is proposed. This driving system combines piezoelectric driving and magnetic modulation together and can transform the reciprocating swing of the stator into step running of the rotor via the intermittent magnetic clamping between the rotor and stator. For investigating the inherent character of dynamics, the dynamic equations of key parts of the driving system are established. The natural frequencies and mode functions of the driving system are solved. A prototype was fabricated to prove the dynamic analysis and measure the output characteristic. The results show that the nature of the frequency measured from the test is coincident with theoretical analysis. In addition, by applying the driving frequency of 3 Hz, the voltage of the modulating signal of 4.5 V, the phase difference α between driving signal and modulating signal of 30◦, the ideal outputs are 0.1046 rad/min for velocity and 0.405 Nmm for torque. Keywords: electromagnetic modulation; piezoelectric motor; modal function; output characteristic 1. Introduction With the continuous development of modern technology, the requirements for driving devices in intelligent manufacturing, optical fiber docking, biomedicine, and focusing systems are increasing. Piezoelectric motors are widely used in these fields because of their high displacement resolution, simple structure, and fast response [1,2].
    [Show full text]
  • Design of a Linear Ultrasonic Piezoelectric Motor
    Brigham Young University BYU ScholarsArchive Theses and Dissertations 2006-07-13 Design of a Linear Ultrasonic Piezoelectric Motor Scott L. Sharp Brigham Young University - Provo Follow this and additional works at: https://scholarsarchive.byu.edu/etd Part of the Mechanical Engineering Commons BYU ScholarsArchive Citation Sharp, Scott L., "Design of a Linear Ultrasonic Piezoelectric Motor" (2006). Theses and Dissertations. 997. https://scholarsarchive.byu.edu/etd/997 This Thesis is brought to you for free and open access by BYU ScholarsArchive. It has been accepted for inclusion in Theses and Dissertations by an authorized administrator of BYU ScholarsArchive. For more information, please contact [email protected], [email protected]. DESIGN OF A LINEAR ULTRASONIC PIEZOELECTRIC MOTOR TITLE PAGE by Scott L. Sharp A thesis submitted to the faculty of Brigham Young University Master of Science Department of Mechanical Engineering Brigham Young University August 2006 vii viii BRIGHAM YOUNG UNIVERSITY SIGNATURE PAGES GRADUATE COMMITTEE APPROVAL of a thesis submitted by Scott L. Sharp This thesis has been read by each member of the following graduate committee and by majority vote has been found to be satisfactory. __________________ __________________________________________ Date Jonathan D. Blotter, Chair __________________ __________________________________________ Date Craig C. Smith __________________ __________________________________________ Date Kenneth W. Chase ix x BRIGHAM YOUNG UNIVERSITY As chair of the candidates graduate committee, I have read the thesis of Scott L. Sharp in its final form and have found that (1) its format, citations, and Bibliographical style are consistent and acceptable and fulfill university and department style requirements; (2) its illustrative materials including figures, tables, and charts are in place; and (3) the final manuscript is satisfactory to the graduate committee and is ready for submission to the university library.
    [Show full text]
  • Ultrasonic Piezoelectric Motor with Intrinsic Torque Measurement – First Results
    P6.8 Ultrasonic Piezoelectric Motor with Intrinsic Torque Measurement – First Results Pott, Peter; Matich, Sebastian; Schlaak, Helmut Technische Universität Darmstadt, Institut für Elektromechanische Konstruktionen Merckstraße 25, 64283 Darmstadt, Germany Piezoelectric actuators are used, when small-scale applications with high torque demands at low speeds are of interest. Here, the inverse piezoelectric effect is used. It describes the ability of certain materials to change their geometry in an electric field [1]. The displacement is about 0.1% of the original length of the material, so for macro-scale movements, these small displacements have to be augmented or added up. Three different approaches can be distinguished: Lever-augmented stacks, stepping actuators, and oscillating actuators. The first group consists of stacked piezoelectric elements integrated into a lever structure that provides an enlargement of the stroke [2-3]. The second group provides discrete steps as a sequence of clamping and pushing [4-6], sticking/slipping movements [7-8], or geared structures [9-10]. Finally, the third and largest group primarily uses the magnification of the amplitude near or at the resonance frequency of the oscillating structure. By adding up the derived stroke rather fast movements up to 1 m/s and high thrust forces up to 30 N can be achieved [5]. The most common type is the travelling wave actuator introduced by Sashida in 1982 [11]. This is widely used for example in camera lenses [12] and shutters [13]. In addition, a variety of other principles is available [1, 14-15], that also use the inverse piezoelectric effect but involve other wave forms and make use of two different vibration modes (e.g.
    [Show full text]
  • MEV 403 Introduction to Mechatronics
    MEV 403 Introduction to Mechatronics Module 2: Sensors and Actuators 1 Santhakumar Mohan, Assistant Professor, MED, NITC Introduction to Actuators • Actuators are basically the muscle behind a mechatronics system that accepts a control command (mostly in the form of an electrical signal) and produces a change in the physical system by generating force, motion, heat, flow, and so forth . 2 Santhakumar Mohan, Assistant Professor, MED, NITC Classification of Actuators • Based on motion • Based on energy supplied – Linear actuator – Electrical – Rotary actuator – Mechanical • Based on number of stable – Electromechanical state outputs – Electromagnetic – Binary – Hydraulic and Pneumatic – Continuous – Smart actuators 3 Santhakumar Mohan, Assistant Professor, MED, NITC Electrical Actuators • Advantages of Electrical actuators – Electricity is easily routed to the actuators; cables are simpler than pipe work. – Electricity is easily controlled by electronic units – Electricity is clean – Electric faults are often easier to diagnose • Disadvantages of electric actuators – Fire hazard – Poor torque – speed characteristics – Basically Rotary motion and complicated mechanism needed for linear motion – Power to weight ratio is inferior to hydraulic motors 4 Santhakumar Mohan, Assistant Professor, MED, NITC Types of Electrical Actuators • DC Motor – Wound field – Permanent magnet – Electronic commutation (brushless motor) • AC Motor – Induction motor – Synchronous motor – Universal motor • Stepper Motor – Variable reluctance – Permanent magnet – Hybrid 5 Santhakumar Mohan, Assistant Professor, MED, NITC Stepper motor • A stepper motor is an electromechanical device which converts electrical pulses into discrete mechanical movements . • The stepper motor is a discrete (incremental) positioning device that moves one step at a time for each pulse command input. • Since they accept direct digital commands and produce a mechanical motion, the stepper motors are used widely in industrial control applications.
    [Show full text]
  • Stamford Newage the Following Item S Have Been Added to Your Cart
    Stamford newage The following item s have been added to your cart. You can now continue shopping or go straight to checkout. Stamford UC is perfect for industrial and marine ac generators in the range 40 to kVA. Single and three phase voltages available from a 12 wire reconnectable winding. The SX is a half wave controlled thyristor type automatic voltage regulator AVR and forms part of the excitation system for a brushless generator. Stamford Newage alternators are well known for their enhanced performance and rugged reliability. This line of generator ends is recognized for their quality and versatility around the world. The Triton solution is more than the industry's highest quality generators. Privacy Policy Sitemap Designed by web design company Media. Contact Us Create an Account Login. Facebook Twitter Google Plus Youtube. Confirm full specs prior to ordering. Details Stamford Newage alternators are well known for their enhanced performance and rugged reliability. The Brand The Triton solution is more than the industry's highest quality generators. We will assist with all your technical questions and service needs. Average User Rating:. Talk about this Product. Newage was the name of a former electrical engineering company in Stamford, Lincolnshire , that made electrical generators from 20— kVA. In it produced the first brushless alternator. The name and reference to Newage has now been reintroduced as the Newage branded low voltage alternator range, as part of the Newage, Stamford and AvK brand portfolio by Cummins Generator Technologies. It was incorporated on 27 August as Newage Engineers Limited. In March it changed its name to Newage International Limited; it would keep this name until June In it produced the first generator with a permanent magnet synchronous generator pmg for automatic voltage regulation avr excitation.
    [Show full text]