Electrical Engineering
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Income? Bisone
INCOME? BISONE ED 179 392 SP 029 296 $ AUTHOR Hamilton, Howard B. TITLE Problem Manual for Power Processiug, Tart 1. Electric Machinery Analysis. ) ,INSTITUTION Pittsbutgh Univ., VA. 51'014 AGENCY National Science Foundation, Weeshingtcni D.C. PUB DATE -70 GRANT NSF-GY-4138 NOTE 40p.; For_related documents', see SE 029 295-298 EDRS PRICE MF01/BCO2 Plus Postage. DESCRIPTORS *College Science: Curriculum Develoimeft: Electricity: Electromechanical lacshnology;- Electfonics: *Engineering Educatiob: Higher Education: Instructional Materials: *Problem Solving; Science CourAes:,'Science Curriculum: Science . Eductttion; *Science Materials: Scientific Concepts AOSTRACT This publication was developed as aPortion/ofa . two-semester se4uence commencing t either the-sixth cr seVenth.term of the undergraduate program in electrical engineering at the University of Pittsburgh. The materials of tfie two courses, produced by' National Science Foundation grant, are concernedwitli power con ion systems comprising power electronic devices, electromechanical energy converters, and,associnted logic configurations necessary to cause the systlp to behave in a, prescrib,ed fashion. The erphasis in this portion of the'two course E` sequende (Part 1)is on electric machinery analysis.. 7his publication is-the problem manual for Part 1, which provide's problems included in 4, the first course. (HM) 4 Reproductions supplied by EDPS are the best that can be made from the original document. * **************************v******************************************** 2 -
Ee 6361- Electrical Drives & Control Ii/Iii Mechanical
EE 6361- ELECTRICAL DRIVES & CONTROL II/III MECHANICAL EE A Course Material on EE – 6361 ELECTRICAL DRIVES & CONTROL By Mr. S.SATHYAMOORTHI /R.RAJAGOPAL ASSISTANT PROFESSOR DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING SASURIE COLLEGE OF ENGINEERING VIJAYAMANGALAM – 638 056 1 R.RAJAGOPAL, S.SATHYAMOORTHI,AP/EEE 2015-16 EE 6361- ELECTRICAL DRIVES & CONTROL II/III MECHANICAL QUALITY CERTIFICATE This is to certify that the e-course material Subject Code : EE- 6361 Subject : Electrical Drives & Control Class : II Year MECH Being prepared by me and it meets the knowledge requirement of the university curriculum. Signature of the Author Name: R.RAJAGOPAL,S.SATHYAMOORTHI Designation: AP/EEE This is to certify that the course material being prepared by Mr.S.Sathyamoorthi / R.Rajagopal is of adequate quality. He has referred more than five books among them minimum one is from aboard author. Signature of HD Name: Mr. E.R.Sivakumar SEAL 2 R.RAJAGOPAL, S.SATHYAMOORTHI,AP/EEE 2015-16 EE 6361- ELECTRICAL DRIVES & CONTROL II/III MECHANICAL EE6361 ELECTRICAL DRIVES AND CONTROL Unit-I Introduction Basic elements-types of electric drives-factors influencing electric drives-heating and cooling curves- loading conditions and classes of duty-Selection of power rating for drive motors with regard to thermal overloading and load variation factors Unit-II Drive motor characteristics Mechanical characteristics- speed- torque characteristics of various types of load and drive motors - braking of electrical motors-dc motors: shunt, series, compound motors-single -
Stepper Motor Or Servo Motor: Which Should It Be?
Stepper Motor or Servo Motor: Which Should It Be? Engineer the Exceptional ENGINEER THE EXCEPTIONAL ENGINEER THE EXCEPTIONAL Stepper Motor or Servo Motor: Which Should It Be? Engineer the Exceptional ENGINEER THE EXCEPTIONAL Each technology has its niche, and since the selection of either stepper or servo ENGINEER THE EXCEPTIONAL technology affects the likelihood of success, it is important that the machine designer consider the technical advantages and disadvantages of both to select the best motor-drive system for an application. Machine designers should not limit utilization of steppers or servos This article presents an overview of stepper according to a fixed mindset or comfort level, but should learn where and servo capabilities to serve as selection each technology works best for controlling a specific mechanism and criteria between the two technologies. process to be performed. A thorough understanding of these technologies will help you achieve optimum Today’s digital stepper motor drives provide enhanced drive features, mechatronic designs to bring out the full option flexibility and communication protocols using advanced capabilities of your machine. integrated circuits and simplified programming techniques. The same is true of servo motor systems, while higher torque density, improved electronics, advanced algorithms and higher feedback resolution have resulted in higher system bandwidth capabilities as well as lower initial and overall operating costs for many applications. STEPPER MOTOR SYSTEM OVERVIEW Stepper motors have several major advantages over servo systems. They typically cost less, have common NEMA mountings, offer lower-torque options, require less-costly cabling, and their open-loop motion control simplifies machine integration and operation. -
Stepping Motors Fundamentals
AN907 Stepping Motors Fundamentals Author: Reston Condit TYPES OF STEPPING MOTORS Microchip Technology Inc. There are three basic types of stepping motors: Dr. Douglas W. Jones permanent magnet, variable reluctance and hybrid. University of Iowa This application note covers all three types. Permanent magnet motors have a magnetized rotor, while variable reluctance motors have toothed soft-iron rotors. Hybrid INTRODUCTION stepping motors combine aspects of both permanent Stepping motors fill a unique niche in the motor control magnet and variable reluctance technology. world. These motors are commonly used in measure- The stator, or stationary part of the stepping motor ment and control applications. Sample applications holds multiple windings. The arrangement of these include ink jet printers, CNC machines and volumetric windings is the primary factor that distinguishes pumps. Several features common to all stepper motors different types of stepping motors from an electrical make them ideally suited for these types of point of view. From the electrical and control system applications. These features are as follows: perspective, variable reluctance motors are distant 1. Brushless – Stepper motors are brushless. The from the other types. Both permanent magnet and commutator and brushes of conventional hybrid motors may be wound using either unipolar motors are some of the most failure-prone windings, bipolar windings or bifilar windings. Each of components, and they create electrical arcs that these is described in the sections below. are undesirable or dangerous in some environments. Variable Reluctance Motors 2. Load Independent – Stepper motors will turn at Variable Reluctance Motors (also called variable a set speed regardless of load as long as the switched reluctance motors) have three to five load does not exceed the torque rating for the windings connected to a common terminal. -
Reference List of Customers
Industrial Systems Group, Bangalore An ISO 90001 Unit Reference List of Customers 1 Rolling Mills...........................................................................................................2 2 Process Lines.........................................................................................................11 3 Steel Making.........................................................................................................13 4 Static Excitation Equipment..................................................................................17 5 Aluminium ............................................................................................................19 6 Cement ..................................................................................................................21 7 Paper......................................................................................................................23 8 Rubber ...................................................................................................................24 9 Mining & Material Handling.................................................................................25 10 Reactive Power Compensation..............................................................................28 11 Other Industries .....................................................................................................30 12 Other Industries – Sub_stations.............................................................................33 13 Pumping Station....................................................................................................34 -
Understanding Permanent Magnet Motor Operation and Optimized Filter Solutions
Understanding Permanent Magnet Motor Operation and Optimized Filter Solutions June 15, 2016 Todd Shudarek, Principal Engineer MTE Corporation N83 W13330 Leon Road Menomonee Falls WI 53154 www.mtecorp.com Abstract Recent trends indicate the use of permanent magnet (PM) motors because of its energy savings over induction motors. PM motors offer energy savings, higher power densities, and improved control. The upfront cost of a PM motor may be higher than an induction motor, but the total cost of ownership may be lower. However, a PM motor system brings design challenges in terms of selecting the best variable frequency drive (VFD) as well as a filter to protect the motor. A PM motor requires the use of a VFD to start and operate. The best VFDs will need to operate at higher switching frequencies to meet the higher fundamental frequencies of the PM motors. In turn, the PM motor will need to be protected from power distortion, harmonics, and overheating. While a traditional filter is de-rated to meet the higher frequencies, this paper will demonstrate that, by nature of the operation of a PM motor, an appropriately design filter that operates for higher switching and fundamental frequencies will reduce the size, weight, and cost of the system. Introduction special considerations when specifying a filter for a PM motor system, specifically the use of Historically induction motors have been used in higher switching frequencies and filters. a variety of industrial applications. Recent trends indicate a shift toward permanent magnet (PM) motors which offer up to 20% energy savings, Induction Motor Operation higher power densities, and improved control. -
Academic Regulations, Course Structure and Detailed Syllabus
ACADEMIC REGULATIONS, COURSE STRUCTURE AND DETAILED SYLLABUS M.Tech (POWER ELECTRONICS AND ELECTRIC DRIVES) FOR MASTER OF TECHNOLOGY TWO YEAR POST GRADUATE COURSE (Applicable for the batches admitted from 2014-2015) R14 ANURAG GROUP OF INSTITUTIONS (AUTONOMOUS) SCHOOL OF ENGINEERING Venkatapur, Ghatkesar, Hyderabad – 500088 ANURAG GROUP OF INSTITUTIONS (AUTONOMOUS) M.TECH. (POWER ELECTRONICS AND ELECTRIC DRIVES) I YEAR - I SEMESTER COURSE STRUCTURE AND SYLLUBUS Subject Code Subject L P Credits A31058 Machine Modeling& Analysis 3 0 3 A31059 Power Electronic Converters-I 3 0 3 A31024 Modern Control Theory 3 0 3 A31060 Power Electronic Control of DC Drives 3 0 3 Elective-I 3 0 3 A31029 HVDC Transmission A31061 Operations Research A31062 Embedded Systems Elective-II A31027 Microcontrollers and Applications 3 0 3 A31063 Programmable Logic Controllers and their Applications A31064 Special Machines A31213 Power Converters Lab 0 3 2 A31214 Seminar - - 2 Total 18 3 22 I YEAR - II SEMESTER Subject Subject L P Credits Code A32058 Power Electronic Converters-II 3 0 3 A32059 Power Electronic Control of AC Drives 3 0 3 A32022 Flexible AC Transmission Systems (FACTS) 3 0 3 A32060 Neural Networks and Fuzzy Systems 3 0 3 Elective-III A32061 Digital Control Systems 3 0 3 A32062 Power Quality A32063 Advanced Digital Signal Processing Elective-IV A32064 Dynamics of Electrical Machines A32065 High-Frequency Magnetic Components A32066 3 0 3 Renewable Energy Systems A32213 Electrical Systems Simulation Lab 0 3 2 A32214 Seminar-II - - 2 Total 18 3 22 II YEAR – I SEMESTER Code Subject L P Credits A33219 Comprehensive Viva-Voce - - 2 A33220 Project Seminar 0 3 2 A33221 Project Work Part-I - - 18 Total Credits - 3 22 II YEAR – II SEMESTER Code Subject L P Credits A34207 Project Work Part-II and Seminar - - 22 Total - - 22 L P C M. -
Axial Field Permanent Magnet Machines with High Overload Capability for Transient Actuation Applications
THE UNIVERSITY OF SHEFFIELD Axial field permanent magnet machines with high overload capability for transient actuation applications By Jiangnan Gong A Thesis submitted for the degree of Doctor of Philosophy Department of Electronic and Electrical Engineering The University of Sheffield. JANUARY 2018 ABSTRACT This thesis describes the design, construction and testing of an axial field permanent magnet machine for an aero-engine variable guide vane actuation system. The electrical machine is used in combination with a leadscrew unit that results in a minimum torque specification of 50Nm up to a maximum speed of 500rpm. The combination of the geometry of the space envelope available and the modest maximum speed lends itself to the consideration of an axial field permanent magnet machines. The relative merits of three topologies of double-sided permanent magnet axial field machines are discussed, viz. a slotless toroidal wound machine, a slotted toroidal machine and a yokeless axial field machine with separate tooth modules. Representative designs are established and analysed with three-dimensional finite element method, each of these 3 topologies are established on the basis of a transient winding current density of 30A/mm2. Having established three designs and compared their performance at the rated 50Nm point, further overload capability is compared in which the merits of the slotless machine is illustrated. Specifically, this type of axial field machine retains a linear torque versus current characteristic up to higher torques than the other two topologies, which are increasingly affected by magnetic saturation. Having selected a slotless machine as the preferred design, further design optimization was performed, including detailed assessment of transient performance. -
Faculty of Degree Engineering - 083 Department of Electrical Engineering -09
Faculty of Degree Engineering - 083 Department of Electrical Engineering -09 Multiple Choice Questions Subject: Control of Electric Drives Branch: Electrical Engineering Subject code: 2160913 Semester: 6th 1. The selection of an electric motor for any application depends on which of the following factors ? (A) Electrical characteristics (B) Mechanical characteristics (C) Size and rating of motors (D) Cost (e) All of the above 2. For a particular application the type of electric-and control gear are determined by which of the following considerations ? (A) Starting torque (B) Conditions of environment (C) Limitation on starting current (D) Speed control range and its nature (e) All of the above 3. Which ofthefollowingmotors is preferred for traction work ? (A) Universal motor (B) D.C. series motor (C) Synchronous motor (D) Three-phase induction motor Dr. Subhash Technical Campus- The Jewel of Junagadh Faculty of Degree Engineering - 083 Department of Electrical Engineering -09 4 Which of the following motors always starts on load ? (A) Conveyor motor (B) Floor mill motor (C) Fan motor (D) All of the above 5 is preferred for automatic drives. (A) Squirrel cage induction motor (B) Synchronous motors (C) Ward-Leonard controlled D.C. motors (D) Any of the above 6. When the load is above a synchronous motor is found to be more economical. (A) 2 kW (B) 20 kW (C) 50 kW (D) 100 kW 7. The load cycle for a motor driving a power press will be (A) variable load (B) continuous (C) continuous but periodical (D) intermittent and variable load 8. Light duty cranes are used in which of the following ? (A) Power houses (B) Pumping stations (C) Automobile workshops (D) All of the above Dr. -
Stepper Motor
STEPPER MOTOR Stepper motors are used in a wide variety of applications, including computer peripherals like printers, scanners, CD drives, camera lenses, etc. In this first article, in a series of articles on stepper motors, we will introduce the reader to the theory behind the working and control of a stepper motor. Stepper Motor Basics A Stepper Motor just like any other motor, converts electrical energy into mechanical energy. A stepper motor consists of the following parts: Stator The stationary part of the motor. In a stepper motor, the stator is a set of electromagnets. Rotor The non-stationary part of the motor. In a stepper motor, the rotor is a permanent magnet. The arrangement of the electromagnets and the permanent magnets in a simple stepper motor is shown in the following diagram. Stepper Motor Construction Stepper Motor Operation Stepper Motor Operation When each of the electromagnet pairs is energized successively, the permanent magnet is attracted to the electromagnet, and aligns with it. This results in rotation of the permanent magnet. This is illustrated in “Stepper Motor Operation” diagram. The stepper motor gets its name from the fact that the rotor rotates in discrete step increments. The simple stepper motor has a step angle of 90 degrees. More complex stepper motors can have step angles as low as 3.6 degrees. These stepper motors have more no. of poles in the rotor. A complex stepper motor is shown in below diagram. The dark grey areas on the rotor are South poles and light grey areas on the rotor are North poles. -
Stepper Motors
Stepper Motors By Brian Tomiuk, Jack Good, Matthew Edwards, Isaac Snellgrove November 14th, 2018 1 What is a Stepper Motor? ● A motor whose movement is divided into discrete “steps” ○ “Turn 10 steps clockwise” ● Holds its position without additional control ○ No sensor or feedback loop 2 Parts of a Stepper Motor Stator - Stays Static Rotor - Rotates the motor shaft https://phidgets.files.wordpress.com/2014/06/stepper_back_web.jpg 3 Different Types of Torque Holding torque - How much load can the motor hold in place when the coils are energized Detent torque - The torque the motor produces when the windings are not energized, sometimes call residual torque 4 Advantages of Stepper Motors ● Has high holding torque (maintains its position) ● Moves in discrete amounts ● Inexpensive ● Brushless (can last longer than brushed motors) 5 Disadvantages of Stepper Motors ● Uses the same amount of power regardless of load ○ Lower power efficiency ● Torque decreases rapidly as speed increases ● No internal feedback ○ Cannot tell when a step was missed ○ Must step slowly to ensure accuracy ● Low torque to inertia ○ Cannot accelerate loads very rapidly 6 How Stepper Motors Work 7 How a Stepper Motor Works Unpowered Electromagnets Bar with magnetic ends A basic stepper motor consists of a series of electromagnets surrounding a magnetically charged bar 8 How a Stepper Motor Works S Powering a pair of the electromagnets causes the middle bar to align with the electromagnets S 9 How a Stepper Motor Works Changing which electromagnets are powered and unpowered -
Design of 42V/3000W PERMANENT MAGNET SYNCHRONOUS GENERATOR ______
Electronics Mechanics Computers The Ohio State University Mechatronic Systems Program Design of 42V/3000W PERMANENT MAGNET SYNCHRONOUS GENERATOR _________________________________ By Guruprasad Mahalingam , M.S. Student Prof. Ali Keyhani Mechatronics System Laboratory DEPARTMENT OF ELECTRICAL ENGINEERING THE OHIO STATE UNIVERSITY [email protected] Phone: 614-292-4430 December, 2000 120 Acknowledgments I wish to thank my adviser, Professor Ali Keyhani, for his insight, support and guidance which made this work possible. This work was supported in part by the Delphi Automotive Systems, The National Science Foundation: Grant ESC 9722844, 9625662, Department of Electrical Engg., The Ohio State University. I also wish to thank Ford Motor Company, TRW, AEP which support the work at Mechatronics Systems Lab. I wish to acknowledge Mongkol Konghirun, Coy Brian Studer whose earlier work in the field was a ready reference to my work. My sincere thanks to Dr. Tomy Sebastian, Delphi Saginaw Steering Systems for his support, advice, and interest in my research; Mr. Philippe Wendling from Magsoft Corporation for his technical assistance. 121 CHAPTER 1 Machine Design - Introduction And Basics 1.1 Background Transforming the classical mechanical and hydraulic systems into electric systems to provide better performance and customer satisfaction is the current trend in the automotive industry Eg. electric power steering systems, electric brakes etc.. The penalty is the increase in demand for electrical power. It is estimated that the steady state power requirement in the typical luxury class vehicle would rise from the current level of 1500 W to about 3000 W and to about 7000 W for a hybrid electric vehicle by the year 2005 [16,17,2].