DOCSLIB.ORG

Period 16 Activity Sheet: Motors and Generators Activity 16.1: How Are Electric Motors and Generators Related? A) Generators

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Period 16 Activity Sheet: Motors and Generators Activity 16.1: How Are Electric Motors and Generators Related? A) Generators Name ___________________________ Section __________________ Period 16 Activity Sheet: Motors and Generators Activity 16.1: How Are Electric Motors and Generators Related? a) Generators. 1) Attach a hand-cranked generator to a small motor and turn the crank. Explain what happens inside the generator when the crank turns to create an electric current. The crank spins a coil of wire relative to a magnet located inside the generator. This movement causes a changing magnetic field, which induces current in the wires. 2) List the energy conversions that take place when you crank the generator and make the motor’s shaft turn. The chemical energy (of your body) kinetic energy of the moving coil electrical energy kinetic energy of the moving motor shaft b) Spinning rotors. In this activity, we see why the rotor of an electric motor spins. Place a permanent magnet on a plastic spinner and make the magnet spin by holding another magnet nearby. The magnets simulate a motor. 1) Could you make a practical motor using only permanent magnets? Explain why or why not. It would not be practical. A changing magnetic field is required to spin the rotor. To create a changing field using only permanent magnets, one magnet must continuously move to keep the second magnet spinning. Place a solenoid near the magnet on the spinner. Make the magnet spin by alternately connecting and disconnecting the solenoid from a 3 battery tray. 1) Could you make a practical motor using electromagnets (like the solenoid) and a continuous, unchanging current? Explain why or why not. No, a motor requires a changing magnetic field. A continuous current, such as the direct current from a battery, produces an unchanging magnetic field. 2) What type of current is required to make a motor run? _a changing current_ 3) How are electric motors and electric generators similar? How do they differ? Both motors and generators use changing magnetic fields. Motors convert electrical energy into kinetic energy, while generators convert kinetic energy into electrical energy. Generators use kinetic energy to spin coils of wire near magnets, creating a changing magnetic field. The changing field induces a current in the wires. Motors use a changing electric current to produce a changing magnetic field, which spins a rotor by attracting and repelling it. 61 16.2 How Do Direct Current (DC) Electric Motors Work? a) St. Louis motor: Connect the St. Louis motor to a DC power supply. 1) Does the St. Louis motor run better when the like poles (both north poles or both south poles) or the unlike poles (one north and one south pole) of its two magnets are oriented in the same direction? The motor works better when the unlike poles are oriented in the same direction, for example, the north end of one magnet across from the south end of the other magnet. 2) Remove one permanent magnet and adjust the remaining magnet until the motor runs. Does the rotor turn more rapidly using one or two permanent magnets? ___two magnets__ 3) What makes the St. Louis motor’s rotor move initially? The magnetic force between the rotor coils and the permanent magnets causes the rotor to spin until it is in the position where it is most strongly attracted to the permanent magnets. 4) What makes the rotor continue to spin? Why doesn’t the rotor turn until its poles are aligned with the opposite poles of the permanent magnets and then stop? The rotor spins toward the position where it is most strongly attracted to the permanent magnet. However, its spinning motion causes it to rotate a little past the point of greatest attraction. After it passes the first permanent magnet, the changing current in the rotor causes its magnetic field to reverse. Now the rotor is attracted to the other permanent magnet, and it rotates toward it. After the rotor has spun a little past the second magnet, the magnetic field reverses once again. The rotor continues to spin toward the first permanent magnet. 5) We have found that a changing current is necessary to make a rotor spin. The St. Louis motor is connected to an unchanging direct current source. What causes a changing current in a direct current motor? __a commutator_ b) Synchronous motor: Connect a solenoid to the screws on the base of a step down transformer. Plug the transformer in the power strip. Hold a magnaprobe (a permanent magnet that spins and is attached to a handle) vertically at one end of the solenoid’s metal core. Use your finger to start the mangnaprobe spinning. 1) Explain why the magnaprobe continues to spin. The alternating current (AC) from the power strip reverses direction 60 times per second. This changing current flows through the transformer where its voltage is stepped down to a safe level and then flows into the solenoid. The changing current induces a changing magnetic field in the solenoid. The changing magnetic field alternately attracts and repels the ends of the permanent magnet in the magnaprobe. The magnaprobe spins in synch with the reversals in direction of the AC current. Thus, this is called a synchronous motor. 62 Activity 16.3: How Can You Make a Simple Motor? a) Building the motor. Refer to the model on your table. Coil of wire 1) Cut a 3 meter length of coated wire. 2) Wrap the wire into a circle 3 to 4 cm in diameter, leaving about 4 cm of wire protruding from each side of the circle. 3) Use sandpaper to carefully scrape the coating off of one side of one end of the protruding wire. Scrape all of the coating off of the other end of the wire. 4) Place the wire circle on a paper clip support stapled to a wooden block. 5) Use connecting wires to attach a 3 battery tray to each side of the metal support. 6) Hold a strong magnet near the coil of wire and start the End view of wire with coil spinning with your finger. coating scraped from b) How does the motor work? one side of one end. 1) What keeps the wire coil spinning? A strong magnet held near the coil of wire provides an unchanging magnetic field. When you push the coil of wire to start it spinning, a changing magnetic field is induced in the coil. These two magnetic fields exert forces on each other. The coil is alternately attracted to and repelled by the permanent magnet, causing it to spin. 2) What provides a changing magnetic field in this motor? A changing current flowing through the coil of wire creates a changing magnetic field that is alternately attracted to and repelled by the permanent magnet. 3) Why must you scrape the coating off of the ends of the wire? Why do you scrape it from only one side of one of the ends? Scraping the coating off of the wire is necessary to make a conducting pathway. If there is coating on only one side of the wire, the conducting pathway is connected and disconnected as the wire spins. The spinning wire acts like a commutator, turning the current on and off. The changing current creates a changing magnetic field. Activity 16.4: Building a Buzzer a) Components List the components a DC motor requires, such as a power source, connecting wires to the power source, etc. 1. a DC power source that provides a steady, unchanging current 2. a way to make the steady DC current into a changing current 3. one electromagnet and either a permanent magnet, material that is attracted to a magnet, such as iron or steel, or a second electromagnet 4. connecting wires 63 b) Directions for Building the Buzzer Step 1 1) Cut off approximately 3 meters of coated copper wire from the wire spool. With a piece of sandpaper, remove the insulating coating from about 1 inch of one end of the wire. Be sure to remove all the insulation so that electrical contact can be made. 2) Let the end of the wire extend several inches beyond the edge of the wood strip that is farther from the nail. With the wire next to the wood, begin wrapping the wire around the nail, distributing the wire evenly along the length of the nail. 3) Wrap the wire until all but 4 inches of the wire have been used. Finish winding with the last turn of wire at the bottom of the nail. 4) Using sandpaper, remove the insulation from about 1 inch of the other end of the wire so that both ends have been stripped of insulation. 5) Which component of your buzzer did you just make? __the wire wrapped around the nail is an electromagnet__ Step 2 1) Bend the paper clip so that it looks like the buzzer model on your table. 2) Position the base of the paper clip on the board. Staple the base of the paper clip to the board so that the staple straddles the two smaller parts of the paper clip. You may need more than one staple. 3) Bend the nonmagnetic wire to look like the model. Position the wire on the board so that the loop is over the top of the nail. Make sure that the top end of the clip extends just slightly above the end of the paper clip. 4) Staple the wire to the board. Step 3 1) Take one end of the copper wire wrapped around the nail and wrap it several times around the base of the nonmagnetic wire. Make sure the cleaned portion of the copper wire is in contact with the nonmagnetic wire.
Load more

Recommended publications
  • Lyall Cooper Dr. Dann ASR – D Block 10 May 2012 the Mighty Railgun I. Abstract the Idea of This Project Is to Build a Railgun
    Lyall Cooper Dr. Dann ASR – D Block 10 May 2012 The Mighty Railgun (All Bark no Bite) I. Abstract The idea of this project is to build a railgun capable of firing a small metal projectile at substantial velocity. The original plan was to build iterative prototypes capable of firing small projectiles, and using them to figure out the ideal design for the final version, but the smaller versions were not very successful due to their relative lack of power, so it was difficult to use them to learn what to do. The final, largest scale railgun is powered by a bank of capacitors with an equivalent capacitance of 24.6mF charged to around 350V. This produces 3013.5J of energy discharged over approximately 58.75 µs (it varies for each firing), drawing a peak of about 1425A when firing a projectile (it once again varies) and about 1600A when not firing a projectile (short circuiting the rails). The railgun is capable of consistently firing a small piece of metal (usually aluminum or copper); however the projectile does not usually travel very far, although this is hard to measure due to the nature of the gun and the speed at which the firing takes place. II. Introduction Electricity is often seemingly mysterious, but we have come to accept and understand how through the interaction of electric and magnetic fields we can create a simple motor, as we did in the first semester. A railgun is just a linear electric motor, at very high speeds. What makes it different, however, is that it uses neither magnets nor coils of wire, and relies entirely on the induced magnetic field in the rails due to the extremely large current to produce a Lorentz Force to propel the projectile (which will be discussed in greater depth in the theory section).
    [Show full text]
  • An Introductory Electric Motors and Generators Experiment for a Sophomore Level Circuits Course
    AC 2008-310: AN INTRODUCTORY ELECTRIC MOTORS AND GENERATORS EXPERIMENT FOR A SOPHOMORE-LEVEL CIRCUITS COURSE Thomas Schubert, University of San Diego Thomas F. Schubert, Jr. received his B.S., M.S., and Ph.D. degrees in electrical engineering from the University of California, Irvine, Irvine CA in 1968, 1969 and 1972 respectively. He is currently a Professor of electrical engineering at the University of San Diego, San Diego, CA and came there as a founding member of the engineering faculty in 1987. He previously served on the electrical engineering faculty at the University of Portland, Portland OR and Portland State University, Portland OR and on the engineering staff at Hughes Aircraft Company, Los Angeles, CA. Prof. Schubert is a member of IEEE and ASEE and is a registered professional engineer in Oregon. He currently serves as the faculty advisor for the Kappa Eta chapter of Eta Kappa Nu at the University of San Diego. Frank Jacobitz, University of San Diego Frank G. Jacobitz was born in Göttingen, Germany in 1968. He received his Diploma in physics from the Georg-August Universität, Göttingen, Germany in 1993, as well as M.S. and Ph.D. degrees in mechanical engineering from the University of California, San Diego, La Jolla, CA in 1995 and 1998, respectively. He is currently an Associate Professor of mechanical engineering at the University of San Diego, San Diego, CA since 2003. From 1998 to 2003, he was an Assistant Professor of mechanical engineering at the University of California, Riverside, Riverside, CA. He has also been a visitor with the Centre National de la Recherche Scientifique at the Université de Provence (Aix-Marseille I), France.
    [Show full text]
  • An Engineering Guide to Soft Starters
    An Engineering Guide to Soft Starters Contents 1 Introduction 1.1 General 1.2 Benefits of soft starters 1.3 Typical Applications 1.4 Different motor starting methods 1.5 What is the minimum start current with a soft starter? 1.6 Are all three phase soft starters the same? 2 Soft Start and Soft Stop Methods 2.1 Soft Start Methods 2.2 Stop Methods 2.3 Jog 3 Choosing Soft Starters 3.1 Three step process 3.2 Step 1 - Starter selection 3.3 Step 2 - Application selection 3.4 Step 3 - Starter sizing 3.5 AC53a Utilisation Code 3.6 AC53b Utilisation Code 3.7 Typical Motor FLCs 4 Applying Soft Starters/System Design 4.1 Do I need to use a main contactor? 4.2 What are bypass contactors? 4.3 What is an inside delta connection? 4.4 How do I replace a star/delta starter with a soft starter? 4.5 How do I use power factor correction with soft starters? 4.6 How do I ensure Type 1 circuit protection? 4.7 How do I ensure Type 2 circuit protection? 4.8 How do I select cable when installing a soft starter? 4.9 What is the maximum length of cable run between a soft starter and the motor? 4.10 How do two-speed motors work and can I use a soft starter to control them? 4.11 Can one soft starter control multiple motors separately for sequential starting? 4.12 Can one soft starter control multiple motors for parallel starting? 4.13 Can slip-ring motors be started with a soft starter? 4.14 Can soft starters reverse the motor direction? 4.15 What is the minimum start current with a soft starter? 4.16 Can soft starters control an already rotating motor (flying load)? 4.17 Brake 4.18 What is soft braking and how is it used? 5 Digistart Soft Starter Selection 5.1 Three step process 5.2 Starter selection 5.3 Application selection 5.4 Starter sizing 1.
    [Show full text]
  • 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
    [Show full text]
  • Electromagnetic Launcher: Review of Various Structures
    Published by : International Journal of Engineering Research & Technology (IJERT) http://www.ijert.org ISSN: 2278-0181 Vol. 9 Issue 09, September-2020 Electromagnetic Launcher : Review of Various Structures Siddhi Santosh Reelkar Prof. Dr. U. V. Patil Department of Electrical Engineering, Department of Electrical Engineering, Government College of Engineering, Government College of Engineering, Karad Karad Prof. Dr. V. V. Khatavkar Department of Electrical Engineering, P.E.S. Modern college of Engineering, Pune Hrishikesh Mehta Utkarsh Alset Aethertec Innovative Solutions, Aethertec Innovative Solutions, Bavdhan, Pune Bavdhan, Pune Abstract— A theoretic review of electromagnetic coil-gun This paper is mainly focusing the basic principle of launcher and its types are illustrated in this paper. In recent electromagnetic coil-gun launcher, inductance and resistance years conventional launchers like steam launchers, chemical calculations, construction and modeling concept of different launchers are replaced by electromagnetic launchers with coil-gun launcher. auxiliary benefits. The electromagnetic launchers like rail- gun and coil-gun elevated with multi pole field structure delivers II. WORKING PRINCIPLE great muzzle velocity and huge repulse force in limited time. Rail gun has two parallel rails from which object is launched. Various types of coil-gun electromagnetic launchers are When current passes through the rails to the object it compared in this paper for its structures and characteristics. The paper focuses on the basic formulae for calculating the produces arc. Because of high current pulse it has more values of inductance and resistance of electromagnetic contact friction losses [4]. Compare to the rail-gun launcher, launchers. Coil-gun launchers have no contact friction losses as there is no electrical contact between coils and object.
    [Show full text]
  • High-Performance Specialty Motors & Application-Specific Motion Systems
    Motion Solutions That Change the Game Aerospace & Defense Automation Commercial-Consumer Industrial High-Performance Specialty Motors Medical & Application-Specific Motion Systems Pumps Robotics Vehicles A World of Solutions Allied Motion products are in use around the globe in a wide range of demanding applications. Our companies possess the expertise, products, and global presence to provide you with the motion solutions you need in today’s globally competitive world. Aerospace & Defense Automation Commercial-Consumer Industrial Medical Pumps Robotics Vehicles www.alliedmotion.com 2 [email protected] Motion Solutions That Change the Game The Allied Motion Culture “VIA” – Value, Integrity, AST – encapsulates the Allied Motion culture. It means we work to create tangible Value for our customers and stakeholders; we maintain the highest Integrity in all of our business relationships; and we utilize Allied Systematic Tools to continuously improve Quality, Delivery, Cost and Innovation. Why Choose Allied Motion to be Your Motion Solution Provider? Global Reach Solution Centers Three strategically located Solution Centers – North America, Europe, Asia – offer local application engineering and sales support to make it easy to do business with us. “We speak your language.” Advanced Technology Products Allied Motion develops advanced-technology products that enable our customers to “change the game.” We strive to produce the most compact, innovative products with the highest performance at a competitive price. Allied Motion Solutions Brushless Torque Motors 4-5 Lean Enterprise: Allied Systematic Tools (AST) Brushless Servo Motors 6-7 Allied Systematic Tools (AST) is our set of lean enterprise business tools that drive continuous improvement. AST insures that our Brushless & PMDC Gear Motors 8-9 customers receive the highest quality products and service at the Brushless Motors with Integrated Controllers 10-11 best possible price.
    [Show full text]
  • Linear Induction Motor
    Linear Induction Motor Electrical and Computer Engineering Tyler Berchtold, Mason Biernat and Tim Zastawny Project Advisor: Professor Steven Gutschlag 4/21/2016 2 Outline of Presentation • Background and Project Overview • Microcontroller System • Final Design • Economic Analysis • Hardware • State of Work Completed • Conclusion 3 Outline of Presentation • Background and Project Overview • Microcontroller System • Final Design • Economic Analysis • Hardware • State of Work Completed • Conclusion 4 Alternating Current Induction Machines • Most common AC machine in industry • Produces magnetic fields in an infinite loop of rotary motion • Current-carrying coils create a rotating magnetic field • Stator wrapped around rotor [1] [2] 5 Rotary To Linear [3] 6 Linear Induction Motor Background • Alternating Current (AC) electric motor • Powered by a three phase voltage scheme • Force and motion are produced by a linearly moving magnetic field • Used in industry for linear motion and to turn large diameter wheels [4] 7 Project Overview • Design, construct, and test a linear induction motor (LIM) • Powered by a three-phase voltage input • Rotate a simulated linear track and cannot exceed 1,200 RPM • Monitor speed, output power, and input frequency • Controllable output speed [5] 8 Initial Design Process • Linear to Rotary Model • 0.4572 [m] diameter 퐿 = 훳푟 (1.1) • 0.3048 [m] arbitrary stator length • Stator contour designed for a small air gap • Arc length determined from stator length and diameter • Converted arc length from a linear motor to the circumference of a rotary motor • Used rotary equations to determine required [6] frequency and verify number of poles 9 Rotational to Linear Speed (1.2) (1.3) 10 Pole Pitch and Speed (1.4) • For fixed length stator τ= L/p • L = Arc Length τ A B C A B C [7] 11 Linear Synchronous Speed Ideal Linear Synchronous Speed vs.
    [Show full text]
  • DC Motor Workshop
    DC Motor Annotated Handout American Physical Society A. What You Already Know Make a labeled drawing to show what you think is inside the motor. Write down how you think the motor works. Please do this independently. This important step forces students to create a preliminary mental model for the motor, which will be their starting point. Since they are writing it down, they can compare it with their answer to the same question at the end of the activity. B. Observing and Disassembling the Motor 1. Use the small screwdriver to take the motor apart by bending back the two metal tabs that hold the white plastic end-piece in place. Pull off this plastic end-piece, and then slide out the part that spins, which is called the armature. 2. Describe what you see. 3. How do you think the motor works? Discuss this question with the others in your group. C. Mounting the Armature 1. Use the diagram below to locate the commutator—the split ring around the motor shaft. This is the armature. Shaft Commutator Coil of wire (electromagnetic) 2. Look at the drawing on the next page and find the brushes—two short ends of bare wire that make a "V". The brushes will make electrical contact with the commutator, and gravity will hold them together. In addition the brushes will support one end of the armature and cradle it to prevent side- to-side movement. 1 3. Using the cup, the two rubber bands, the piece of bare wire, and the three pieces of insulated wire, mount the armature as in the diagram below.
    [Show full text]
  • Green Energy Based Electrical Power Generation System
    ISSN (Print) : 2320 – 3765 ISSN (Online): 2278 – 8875 International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering (An ISO 3297: 2007 Certified Organization) Vol. 5, Issue 2, February 2016 Green Energy Based Electrical Power Generation System Ronak .L Tandel1, Dipen .D Patel2, Akash .M Tandel3, Keyur .M Mistry4, Shani .M Vaidya5 UG Student, Dept. of Electrical Engineering, Valia Institute of Technology, Bharuch, Gujarat, India1-4 Assistant Professor, Dept. of Electrical Engineering, Valia Institute of Technology, Bharuch, Gujarat, India5 ABSTRACT: Due to the rapid growth in the usage electricity and the price combustion fuel, motivate us to use natural air as a fuel to generate electricity, this paper shows a natural air and industrial waste gases power driven electricity generating system, Which can produced electricity at very low cost using air or waste gas as a fuel, This system will be extremely handy at the place where we have to control only ON and OFF switches for operating and charging purpose of the system, The main aim of this work is to minimize the running cost, charging time, pollution, recover losses of electrical generator and also to maximize it efficiency so that it can run for maximum time as possible to the each and every user, so in this paper we have described a nature air driven electricity generating system. KEYWORDS:Waste gas, Compressed air, Air motor, Alternator, Dynamo, AutoCAD. I. INTRODUCTION Electric power is basic necessity of any industries and it can be very costly
    [Show full text]
  • Improvements in Modern Weapons Systems: the Use of Dielectric
    Preprints (www.preprints.org) | NOT PEER-REVIEWED | Posted: 6 August 2021 doi:10.20944/preprints202108.0166.v1 Improvements in modern weapons systems: the use of dielectric materials for the development of advanced models of electric weapons powered by brushless homopolar generator Daniela Georgiana GOLEA PhD student, "Mihai Viteazul" National Intelligence Academy, Bucharest, Romania [email protected] Lucian Ștefan COZMA PhD in Military Sciences, National Defense University "Carol I", Bucharest, Romania PhD student, Faculty of Physics, Magurele, University of Bucharest, Romania [email protected] Abstract: Although the idea of making electric weapons has emerged since the beginning of the 20th Century, the great number of technological problems made that such technology was not developed. During the Cold War, the US strategic programme Space Defensive Initiative paid a special attention to this category of weapons, but the experiments have demonstrated that the prototypes are too big, very heavy, and involve a very high energy consumption and low reliability. Under these circumstances, the authors have noticed the trend to design new types of electric weapons starting from the hybridization of some technologies: the compressed flux weapons, the plasma electromagnetic cannon, the electromagnetic weapons as the coil-gun and rail-gun. Keywords: electric weapons, rail gun, electromagnetic ammunition, hybrid technologies, plasma detonator. Introduction Since the beginning of the XXth Century there have been concerns about the development of the electric weapons capable of equating and even exceeding the performance of firearms by using the electromagnetic forces. In order to see how this technology evolved and what prospects it opens, we will continue by giving five examples: the early electric weapons proposed by the inventor Fauchon Vileplee1; the electric weapon model analyzed by Ladislav Zenisek2; the model experienced by the French3 in the late 90s, and the model recently analyzed by lt.col.
    [Show full text]
  • EV Power Systems (Motors and Controllers)
    EV Power Systems (Motors and controllers) The power system of an electric vehicle consists of just two components: the motor that provides the power and the controller that controls the application of this power. In comparison, the power system of gasoline-powered vehicles consists of a number of components, such as the engine, carburetor, oil pump, water pump, cooling system, starter, exhaust system, etc. Motors Electric motors convert electrical energy into mechanical energy. Two types of electric motors are used in electric vehicles to provide power to the wheels: the direct current (DC) motor and the alternating current (AC) motor. DC electric motors have three main components: • A set of coils (field) that creates the magnetic forces which provide torque • A rotor or armature mounted on bearings that turns inside the field • Commutating device that reverses the magnetic forces and makes the armature turn, thereby providing horsepower. As in the DC motor, an AC motor also has a set of coils (field) and a rotor or armature, however, since there is a continuous current reversal, a commutating device is not needed. Both types of electric motors are used in electric vehicles and have advantages and disadvantages, as shown here. While the AC motor is less expensive and lighter weight, the DC motor has a simpler controller, making the DC motor/controller combination less expensive. The main disadvantage of the AC motor is the cost of the electronics package needed to convert (invert) the battery‘s direct current to alternating current for the motor. Past generations of electric vehicles used the DC motor/controller system because they operate off the battery current without complex electronics.
    [Show full text]
  • Design and Fabrication of Single Sided Linear Induction Motor for CNC Machines Sushmita Deb1, Lt
    Design and Fabrication of Single Sided Linear Induction Motor for CNC Machines 1 2 3 Sushmita Deb , Lt. Prof. S C Dey , Prof. D. Suryanarayana 1Department of Electrical & Electronics Engineering, SJM Institute of Technology Chitradurga, Karnataka (India) 2,3Retd. Professors, E&E Dept., Previously worked at SMIT, Sikkim (India) ABSTRACT Anything that requires linear motion will require a Linear Induction Motor. Linear Induction Motors (LIM) are used in many different applications, from moving sliding doors to high speed trains around the world. The main aim of this project is to design, fabricate and analyze a small laboratory sized single-sided linear induction motor (SLIM) for educational aid. The idea of a practical LIM was first developed by an English Electrical Engineer, Eric Laithwaite around 1940. LIM operates on the same principle as the conventional rotary motor. To understand the principle of working of a LIM let the Rotary induction motor (RIM) is cut out and laid to form the equivalent LIM. Everything remains same, only the direction of motion has been changed. This thesis describes the design, fabrication, modeling, testing of a single sided linear induction motor. The stator winding design is particularly important. Keywords: LIM, RIM, Single Sided LIM, CNC I. INTRODUCTION In engineering, especially in electrical and mechanical automated structures such as industrial robots, fast manipulations and machine tools (advanced like CNC machines) linear movements are very usual. These movements are mostly obtained by using rotating motors in combination with rotation-to-translation mechanisms. However, in case where high speed and accuracy are required of these mechanisms, serious problems may arise with stiffness, mass, friction and backlash.
    [Show full text]