Design and Fabrication of Moto Autor
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Evaluation of Direct Torque Control with a Constant-Frequency Torque Regulator Under Various Discrete Interleaving Carriers
electronics Article Evaluation of Direct Torque Control with a Constant-Frequency Torque Regulator under Various Discrete Interleaving Carriers Ibrahim Mohd Alsofyani and Kyo-Beum Lee * Department of Electrical and Computer Engineering, Ajou University, 206, World cup-ro, Yeongtong-gu Suwon 16499, Korea * Correspondence: [email protected]; Tel.: +82-31-219-2376 Received: 25 June 2019; Accepted: 20 July 2019; Published: 23 July 2019 Abstract: Constant-frequency torque regulator–based direct torque control (CFTR-DTC) provides an attractive and powerful control strategy for induction and permanent-magnet motors. However, this scheme has two major issues: A sector-flux droop at low speed and poor torque dynamic performance. To improve the performance of this control method, interleaving triangular carriers are used to replace the single carrier in the CFTR controller to increase the duty voltage cycles and reduce the flux droop. However, this method causes an increase in the motor torque ripple. Hence, in this work, different discrete steps when generating the interleaving carriers in CFTR-DTC of an induction machine are compared. The comparison involves the investigation of the torque dynamic performance and torque and stator flux ripples. The effectiveness of the proposed CFTR-DTC with various discrete interleaving-carriers is validated through simulation and experimental results. Keywords: constant-frequency torque regulator; direct torque control; flux regulation; induction motor; interleaving carriers; low-speed operation 1. Introduction There are two well-established control strategies for high-performance motor drives: Field orientation control (FOC) and direct torque control (DTC) [1–3]. The FOC method has received wide acceptance in industry [4]. Nevertheless, it is complex because of the requirement for two proportional-integral (PI) regulators, space-vector modulation (SVM), and frame transformation, which also needs the installation of a high-resolution speed encoder. -
Direct Torque Control of Induction Motors
DIRECT TORQUE CONTROL FOR INDUCTION MOTOR DRIVES MAIN FEATURES OF DTC · Decoupled control of torque and flux · Absence of mechanical transducers · Current regulator, PWM pulse generation, PI control of flux and torque and co-ordinate transformation are not required · Very simple control scheme and low computational time · Reduced parameter sensitivity BLOCK DIAGRAM OF DTC SCHEME + _ s* s j s + Djs _ Voltage Vector s * T + j s DT Selection _ T S S S s Stator a b c Torque j s s E Flux vs 2 Estimator Estimator 3 s is 2 i b i a 3 Induction Motor In principle the DTC method selects one of the six nonzero and two zero voltage vectors of the inverter on the basis of the instantaneous errors in torque and stator flux magnitude. MAIN TOPICS Þ Space vector representation Þ Fundamental concept of DTC Þ Rotor flux reference Þ Voltage vector selection criteria Þ Amplitude of flux and torque hysteresis band Þ Direct self control (DSC) Þ SVM applied to DTC Þ Flux estimation at low speed Þ Sensitivity to parameter variations and current sensor offsets Þ Conclusions INVERTER OUTPUT VOLTAGE VECTORS I Sw1 Sw3 Sw5 E a b c Sw2 Sw4 Sw6 Voltage-source inverter (VSI) For each possible switching configuration, the output voltages can be represented in terms of space vectors, according to the following equation æ 2p 4p ö s 2 j j v = ç v + v e 3 + v e 3 ÷ s ç a b c ÷ 3 è ø where va, vb and vc are phase voltages. -
Open Fwong Phd Dissertation.Pdf
The Pennsylvania State University The Graduate School Department of Chemistry CATALYTIC NANOMOTORS AND MICROPUMP SYSTEMS UTILIZING ALTERNATE FUELS A Dissertation in Chemistry by Flory K. Wong © 2016 Flory K. Wong Submitted in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy December 2016 ii The dissertation of Flory K. Wong was reviewed and approved* by the following: Ayusman Sen Distinguished Professor of Chemistry Dissertation Advisor Chair of Committee Thomas E. Mallouk Evan Pugh University Professor of Chemistry, Biochemistry, Molecular Biology, and Physics Head of the Department of Chemistry Raymond E. Schaak DuPont Professor of Materials Chemistry Darrell Velegol Distinguished Professor of Chemical Engineering *Signatures are on file in the Graduate School. iii ABSTRACT Colloidal assemblies of self-powered active particles have become a focus area of research. Ranging from microscopic particle suspensions to nanoscale molecules, these systems transduce chemical energy into mechanical motion across multiple length scales following a variety of mechanisms. Understanding the energy transduction processes and the subsequent nature of particle dynamics offers unprecedented opportunities to explore the physics of small-scale colloidal systems and to harness their behavior in many useful applications. However, over a decade after the initial discovery of autonomous bimetallic nanorods, we continue to struggle to bring such systems into real-world applications. Part of the setback has been the in-depth research into hydrogen peroxide fuel. While the studies have built up the fundamental knowledge necessary for the advancement of the field, we have yet to do the same for other systems that employ alternate fuels. This dissertation aims to fill that void by developing nano- and micromotor and pump systems that does not rely on traditional hydrogen peroxide fuel, uses novel material by taking inspiration in other areas of research, and complete in-depth studies to provide a clear understanding of such systems. -
Single-Phase Line Start Permanent Magnet Synchronous Motor with Skewed Stator*
POWER ELECTRONICS AND DRIVES Vol. 1(36), No. 2, 2016 DOI: 10.5277/PED160212 SINGLE-PHASE LINE START PERMANENT MAGNET SYNCHRONOUS MOTOR WITH SKEWED STATOR* MACIEJ GWOŹDZIEWICZ, JAN ZAWILAK Wrocław University of Science and Technology, Wybrzeże Stanisława Wyspiańskiego 27, 50-370 Wrocław, Poland, e-mail: [email protected], [email protected] Abstract: The article deals with single-phase line start permanent magnet synchronous motor with skewed stator. Constructions of two physical motor models are presented. Results of the motors run- ning properties are analysed. Keywords: single-phase motor, permanent magnet, skew, vibration 1. INTRODUCTION Single-phase induction motors almost always have skewed rotors. It is a simple and effective solution in limitation of the motor vibration, noise and torque pulsation. In the case of line start permanent magnet synchronous motors skewed rotor is ex- tremely difficult to manufacture due to interior permanent magnets. Skewed stator is less complicated in comparison with skewed rotor [3], [4], [7], [8]. During many tests of single-phase line start permanent magnet synchronous motor physical models The authors noticed that vibration is one of the main drawbacks of these motors [1], [2]. It prompted them to construct and build a single-phase line start permanent magnet motor with skewed stator. 2. MOTOR CONSTRUCTION Two dimensional field-circuit models of the single-phase line start permanent magnet synchronous motor were applied in Maxwell software. The models are based on the mass production single-phase induction motor Seh 80-2B type: rated power Pn = 1.1 kW, rated voltage Un = 230 V, rated frequency fn = 50 Hz, number of pole * Manuscript received: September 7, 2016; accepted: December 7, 2016. -
The Fundamentals of Ac Electric Induction Motor Design and Application
THE FUNDAMENTALS OF AC ELECTRIC INDUCTION MOTOR DESIGN AND APPLICATION by Edward J. Thornton Electrical Consultant E. I. du Pont de Nemours Houston, Texas and J. Kirk Armintor Senior Account Sales Engineer Rockwell Automation The Woodlands, Texas Edward J. (Ed) Thornton is an Electrical Electrical Mechanical Consultant in the Electrical Technology Coupling System Field System Consulting Group in Engineering at DuPont, in Houston, Texas. His specialty is the design, operation, and maintenance of electric power distribution systems and large motor installations. He has 20 years E , I T , w of consulting experience with DuPont. Mr. Thornton received his B.S. degree Figure 1. Block Representation of Energy Conversion for Motors. (Electrical Engineering, 1978) from Virginia Polytechnic Institute and State University. The coupling magnetic field is key to the operation of electrical He is a registered Professional Engineer in the State of Texas. apparatus such as induction motors. The fundamental laws associated with the relationship between electricity and magnetism were derived from experiments conducted by several key scientists J. Kirk Armintor is a Senior Account in the 1800s. Sales Engineer in the Rockwell Automation Houston District Office, in The Woodlands, Basic Design and Theory of Operation Texas. He has 32 years’ experience with The alternating current (AC) induction motor is one of the most motor applications in the petroleum, rugged and most widely used machines in industry. There are two chemical, paper, and pipeline industries. major components of an AC induction motor. The stationary or He has authored technical papers on motor static component is the stator. The rotating component is the rotor. -
Leonardo Da Vinci and Perpetual Motion
Leonardo da Vinci and Perpetual Motion Allan A. Mills CELEBRATING LEONARDO DA VINCI CELEBRATING umankind has always sought to reduce the the same wheel, then the machine H ABSTRACT need for its own manual labor. Draught animals were one might turn “forever.” solution, but much more beguiling was the concept of ma- A number of empirical attempts Leonardo da Vinci illustrated chines that would work “by themselves,” with no obvious prime to achieve such a hydraulic chimera several traditional forms of mover [1]. Even in ancient times, it appears that at least two perhaps were made but went un- “perpetual-motion machine” in categories had been proposed: the self-pumping waterwheel recorded because they never worked. small pocket books now known and the mechanical overbalancing wheel. None of course Drawings and plans of self-pumping as the Codex Forster. He was well aware that these designs, worked, and as science and technology progressed it became wheels persisted into the 18th cen- based on waterwheel/pump apparent that any such device was theoretically impossible. tury and even into modern times combinations, mechanical However, before this understanding was fully achieved and as amusing artifacts of linear per- overbalancing hammers or became well known, many technologists and hopeful inven- spective [3]. Progress in the under- rolling balls, would not—and could not—work. tors [2] felt obliged to devote time to this hoary problem. standing of efficiency, friction and Among the former was Leonardo da Vinci. Well aware of the the conservation of energy gradu- futility of all suggestions for achieving “perpetual motion,” he ally vindicated the practical knowl- simply recorded—and refuted—ideas that were prevalent in edge that, no matter how ingenious, his time. -
Abstract Controlling Ac Motor Using Arduino
ABSTRACT CONTROLLING AC MOTOR USING ARDUINO MICROCONTROLLER Nithesh Reddy Nannuri, M.S. Department of Electrical Engineering Northern Illinois University, 2014 Donald S Zinger, Director Space vector modulation (SVM) is a technique used for generating alternating current waveforms to control pulse width modulation signals (PWM). It provides better results of PWM signals compared to other techniques. CORDIC algorithm calculates hyperbolic and trigonometric functions of sine, cosine, magnitude and phase using bit shift, addition and multiplication operations. This thesis implements SVM with Arduino microcontroller using CORDIC algorithm. This algorithm is used to calculate the PWM timing signals which are used to control the motor. Comparison of the time taken to calculate sinusoidal signal using Arduino and CORDIC algorithm was also done. NORTHERN ILLINOIS UNIVERSITY DEKALB, ILLINOIS DECEMBER 2014 CONTROLLING AC MOTOR USING ARDUINO MICROCONTROLLER BY NITHESH REDDY NANNURI ©2014 Nithesh Reddy Nannuri A THESIS SUBMITTED TO THE GRADUATE SCHOOL IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE MASTER OF SCIENCE DEPARTMENT OF ELECTRICAL ENGINEERING Thesis Director: Dr. Donald S Zinger ACKNOWLEDGEMENTS I would like to express my sincere gratitude to Dr. Donald S. Zinger for his continuous support and guidance in this thesis work as well as throughout my graduate study. I would like to thank Dr. Martin Kocanda and Dr. Peng-Yung Woo for serving as members of my thesis committee. I would like to thank my family for their unconditional love, continuous support, enduring patience and inspiring words. Finally, I would like to thank my friends and everyone who has directly or indirectly helped me for their cooperation in completing the thesis. -
Electric Motors
SPECIFICATION GUIDE ELECTRIC MOTORS Motors | Automation | Energy | Transmission & Distribution | Coatings www.weg.net Specification of Electric Motors WEG, which began in 1961 as a small factory of electric motors, has become a leading global supplier of electronic products for different segments. The search for excellence has resulted in the diversification of the business, adding to the electric motors products which provide from power generation to more efficient means of use. This diversification has been a solid foundation for the growth of the company which, for offering more complete solutions, currently serves its customers in a dedicated manner. Even after more than 50 years of history and continued growth, electric motors remain one of WEG’s main products. Aligned with the market, WEG develops its portfolio of products always thinking about the special features of each application. In order to provide the basis for the success of WEG Motors, this simple and objective guide was created to help those who buy, sell and work with such equipment. It brings important information for the operation of various types of motors. Enjoy your reading. Specification of Electric Motors 3 www.weg.net Table of Contents 1. Fundamental Concepts ......................................6 4. Acceleration Characteristics ..........................25 1.1 Electric Motors ...................................................6 4.1 Torque ..............................................................25 1.2 Basic Concepts ..................................................7 -
The Museum of Unworkable Devices
The Museum of Unworkable Devices This museum is a celebration of fascinating devices that don't work. It houses diverse examples of the perverse genius of inventors who refused to let their thinking be intimidated by the laws of nature, remaining optimistic in the face of repeated failures. Watch and be amazed as we bring to life eccentric and even intricate perpetual motion machines that have remained steadfastly unmoving since their inception. Marvel at the ingenuity of the human mind, as it reinvents the square wheel in all of its possible variations. Exercise your mind to puzzle out exactly why they don't work as the inventors intended. This, like many pages at this site, is a work in progress. Expect revisions and addition of new material. Since these pages are written in bits and pieces over a long period of time, there's bound to be some repetition of ideas. This may be annoying to those who read from beginning to end, and may be just fine for those who read these pages in bits and pieces. Galleries The Physics Gallery, an educational tour. The physics of unworkable devices and the physics of the real world. The Annex for even more incredible and unworkable machines. Advanced Concepts Gallery where clever inventors go beyond the classical overbalanced wheels. New Acquisitions. We're not sure where to put these. Will They Work? These ideas don't claim perpetual motion or over-unity performance, nor do they claim to violate physics. But will they work? Whatever Were They Thinking? The rationale behind standard types of perpetual motion devices. -
Equating a Car Alternator with the Generated Voltage Equation by Ervin Carrillo
Equating a Car Alternator with the Generated Voltage Equation By Ervin Carrillo Senior Project ELECTRICAL ENGINEERING DEPARTMENT California Polytechnic State University San Luis Obispo 2012 © 2012 Carrillo TABLE OF CONTENTS Section Page Acknowledgments ......................................................................................................... i Abstract ........................................................................................................................... ii I. Introduction ........................................................................................................ 1 II. Background ......................................................................................................... 2 III. Requirements ...................................................................................................... 8 IV. Obtaining the new Generated Voltage equation and Rewinding .................................................................................................................................... 9 V. Conclusion and recommendations .................................................................. 31 VI. Bibliography ........................................................................................................ 32 Appendices A. Parts list and cost ...................................................................................................................... 33 LIST OF FIGURES AND TABLE Section Page Figure 2-1: Removed drive pulley from rotor shaft [3]……………………………………………. 4. -
Report of Contributions
MT25 Conference 2017 - Timetable, Abstracts, Orals and Posters Report of Contributions https://indico.cern.ch/e/MT25-2017 MT25 Conferenc … / Report of Contributions 3D Electromagnetic Analysis of Tu … Contribution ID: 5 Type: Poster Presentation of 1h45m 3D Electromagnetic Analysis of Tubular Permanent Magnet Linear Launcher Tuesday, 29 August 2017 13:15 (1h 45m) A short stroke and large thrust axial magnetized tubular permanent magnet linear launcher (TPMLL) with non-ferromagnetic rings is presented in this paper. Its 3D finite element (FE) models are estab- lished for sensitivity analyses on some parameters, such as air gap thickness, permanent magnet thickness, permanent magnet width, stator yoke thickness and four types of permanent magnet material, ferrite, NdFeB, AlNiCO5 and Sm2CO17 are conducted to achieve greatest thrust. Then its 2D finite element (FE) models are also established. The electromagnetic thrusts calculated by 2D and 3D finite element method (FEM) and got from prototype test are compared. Moreover, the prototype static and dynamic tests are conducted to verify the 2D and 3D electromagnetic analysis. The FE software FLUX provides the interface with the MATLAB/Simulink to establish combined simulation. To improve the accuracy of the simulation, the combined simulation between the model of the control system in Matlab/Simulink and the 3D FE model of the TPMLL in FLUX is built in this paper. The combined simulation between the control system and the 3D FE modelof the TPMLL is built. A prototype is manufactured according to the final designed dimensions. The photograph of the developed TPMLL prototype with thrust sensor and the magnetic powder brake as the load are shown. -
Perpetual Motion Machines Math21a WATER MACHINE (1620)
Perpetual Motion Machines Math21a WATER MACHINE (1620). ABSTRACT. Is it possible to produce devices which produce energy? Such a machine is called a perpetual motion machine. It is also called with its Latin name perpetuum mobile. Water flowing down turns an pump which transports the water back up. There are many variants of this idea: a b electric motor which turns a generator whose electricity is LINE INTEGRALS. If F (x,y,z) is a vector field and γ : t 7→ r(t) is a curve, then W = F (r(t)) · r′(t) dt is Ra used to power the motor. In all of these ideas, there is called a line integral along the curve. The short-hand notation F · ds is also used. If F is a force field, Rγ a twist like some kind of gear or change of voltage which then W is work. confuses a naive observer. CLOSED CURVES. The fundamental theorem of line integrals assures that the line integral along a closed curve is zero if the vector field is a gradient field. The work done along a closed path is zero. In a physical context, this can be understood as energy conservation. BALL MACHINE (1997). ENERGY CONSERVATION. All physical experiments so far confirm that static force fields in our universe are of the form F = −∇U, where U is a function called the potential energy. If a body moves in this force The energy needed to lift the balls up is claimed to be field, its acceleration satisfies by Newton’s laws mx¨ = F (x).