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The Relationship Between Microstructure and Magnetic Properties of Alnico Alloys
The relationship between microstructure and magnetic properties of alnico alloys Citation for published version (APA): Vos, de, K. J. (1966). The relationship between microstructure and magnetic properties of alnico alloys. Technische Hogeschool Eindhoven. https://doi.org/10.6100/IR287613 DOI: 10.6100/IR287613 Document status and date: Published: 01/01/1966 Document Version: Publisher’s PDF, also known as Version of Record (includes final page, issue and volume numbers) Please check the document version of this publication: • A submitted manuscript is the version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website. • The final author version and the galley proof are versions of the publication after peer review. • The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal. -
Control of DC Servomotor
Control of DC Servomotor Report submitted in partial fulfilment of the requirement to the degree of B.SC In Electrical and Electronic Engineering Under the supervision of Dr. Abdarahman Ali Karrar By Mohammed Sami Hassan Elhakim To Department of Electrical and Electronic Engineering University of Khartoum July 2008 Dedication I would like to take this opportunity to write these humble words that are unworthy of expressing my deepest gratitude for all those who made this possible. First of all I would like to thank god for my general existence and everything else around and within me. Second I would like to thank my beloved parents(Sami & Sawsan), my brothers (Tarig & Hassan), and my sister (Latifa), thank you so much for your support, guidance and care, you were always there to make me feel better and encourage me. I would like also to thanks all my friends inside and out Khartoum university, thank you for your patients tolerance and understanding, for your endless love that has stretched so far, for easing my pain and pulling me through. A special thanks to my partner Muzaab Hashiem without his help and advice i won’t be able to do what i did, thank you for being an ideal partner, friend and bother. Last but not the least i would like to thank my supervisor Dr. Karar and all those who helped me throughout this project, thank you for filling my mind with this rich knowledge. Mohammed Sami Hassan Elhakim. I Acknowledgement The first word goes to God the Almighty for bringing me to this world and guiding me as i reached this stage in my life and for making me live and see this work. -
Solidification of Immiscible Alloys Under High Magnetic Field
metals Review Solidification of Immiscible Alloys under High Magnetic Field: A Review Chen Wei 1, Jun Wang 1,*, Yixuan He 1, Jinshan Li 1,* and Eric Beaugnon 2 1 State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China; [email protected] (C.W.); [email protected] (Y.H.) 2 INSA Toulouse, University Grenoble Alpes, University Toulouse Paul Sabatier, EMFL, CNRS, LNCMI, 38000 Grenoble, France; [email protected] * Correspondence: [email protected] (J.W.); [email protected] (J.L.) Abstract: Immiscible alloy is a kind of functional metal material with broad application prospects in industry and electronic fields, which has aroused extensive attention in recent decades. In the solidification process of metallic material processing, various attractive phenomena can be realized by applying a high magnetic field (HMF), including the nucleation and growth of alloys and mi- crostructure evolution, etc. The selectivity provided by Lorentz force, thermoelectric magnetic force, and magnetic force or a combination of magnetic field effects can effectively control the solidification process of the melt. Recent advances in the understanding of the development of immiscible alloys in the solidification microstructure induced by HMF are reviewed. In this review, the immiscible alloy systems are introduced and inspected, with the main focus on the relationship between the migration behavior of the phase and evolution of the solidification microstructure under HMF. Special attention is paid to the mechanism of microstructure evolution caused by the magnetic field and its influence on performance. The ability of HMF to overcome microstructural heterogeneity in the solidification Citation: Wei, C.; Wang, J.; He, Y.; Li, process provides freedom to design and modify new functional immiscible materials with desired J.; Beaugnon, E. -
Exploration of Alnico Permanent Magnet Microstructure And
Iowa State University Capstones, Theses and Graduate Theses and Dissertations Dissertations 2018 Exploration of Alnico permanent magnet microstructure and processing for near final shape magnets with solid-state grain alignment for improved properties Aaron Gregory Kassen Iowa State University Follow this and additional works at: https://lib.dr.iastate.edu/etd Part of the Materials Science and Engineering Commons, and the Mechanics of Materials Commons Recommended Citation Kassen, Aaron Gregory, "Exploration of Alnico permanent magnet microstructure and processing for near final shape magnets with solid-state grain alignment for improved properties" (2018). Graduate Theses and Dissertations. 16390. https://lib.dr.iastate.edu/etd/16390 This Dissertation is brought to you for free and open access by the Iowa State University Capstones, Theses and Dissertations at Iowa State University Digital Repository. It has been accepted for inclusion in Graduate Theses and Dissertations by an authorized administrator of Iowa State University Digital Repository. For more information, please contact [email protected]. Exploration of Alnico permanent magnet microstructure and processing for near final shape magnets with solid-state grain alignment for improved properties by Aaron Gregory Kassen A dissertation submitted to the graduate faculty in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY Major: Materials Science & Engineering Program of Study Committee: Iver E. Anderson, Major Professor Scott Chumbley David C. Jiles Matthew J. Kramer Alan M. Russell The student author, whose presentation of the scholarship herein was approved by the program of study committee, is solely responsible for the content of this dissertation. The Graduate College will ensure this dissertation is globally accessible and will not permit alterations after a degree is conferred. -
DC Servo Motor Modeling
MODELING DC SERVOMOTORS CONTROL SYSTEMS TECH NOTE © Dr. Russ Meier, MSOE INTRODUCTION A DC motor is an actuator that converts electrical energy to mechanical rotation using the principles of electromagnetism. The circuit symbol for a DC motor is shown in Figure 1. + Va M - Figure 1: Circuit symbol for a DC servomotor The learning objectives of this technical note are: 1. Draw the equivalent DC servomotor circuit theory model. 2. State the equations of motion used to derive the electromechanical transfer function in the time domain and the s-domain. 3. Draw the DC servomotor signal block diagram. 4. Derive the DC servomotor electromechanical transfer function. CIRCUIT THEORY MODEL The circuit shown in Figure 2 models the DC servomotor. Note that an armature control current is created when the armature control voltage, Va, energizes the motor. The current flow through a series-connected Ra La + + Tm Va Vb R θ m - - Figure 2: DC servomotor circuit theory model armature resistance, an armature inductance, and the rotational component (the rotor) of the motor. The rotor shaft is typically drawn to the right with the torque (Tm) and angular displacement (θm) variables shown. The motor transfer function is the ratio of angular displacement to armature voltage. Figure 3: The DC servomotor transfer function EQUATIONS OF MOTION Three equations of motion are fundamental to the derivation of the transfer function. Relationships between torque and current, voltage and angular displacement, and torque and system inertias are used. Torque is proportional to the armature current. The constant of proportionality is called the torque constant and is given the symbol Kt. -
Direct Drive Dc Torque Servo Motors
DIRECT DRIVE DC TORQUE SERVO MOTORS QT- Series Rare Earth Magnet Motors DIRECT DRIVE DC SERVO MOTORS The Direct Drive DC Torque motor is a servo actuator which can be directly attached to the load it drives. It has a permanent magnet (PM) field and a wound armature which act together to convert electrical power to torque. This torque can then be utilized in positioning or speed control systems. In general, torque motors are deigned for three different types of operation: » High stall torque (“stand-still” operation) for positioning systems » High torque at low speeds for speed control systems » Optimum torque at high speed for positioning, rate, or tensioning systems SUPERIOR QUALITY With the widest range of standard and custom motion solutions, we collaborate with you to deploy rugged, battle-worthy systems engineered and built to meet your singular requirements. Kollmorgen provides direct drive servo motor solutions for the following applications: » Weapons stations and gun turrets » Missile guidance and precision-guided munitions » Radar pedestals and tracking stations » Unmanned ground, aerial and undersea vehicles » Ground vehicles and sea systems » Aircraft and spacecraft systems » Camera gimbals » IR countermeasure platforms » Laser weapon platforms QT- Series D irect Drive DC Servo Motors Advantages of Direct Drive DC Torque Motors Direct drive torque motors are particularly suited for servo system applications where it is desirable to minimize size, weight, power and response time, and to maximize rate and position accuracies. Frameless motors range from 28.7mm (1.13in) OD weighing 1.4 ounces (.0875 lbs) to a 4067 N-m (3000 lb-ft) unit with a 1067mm (42in) OD and a 660.4mm (26in) open bore ID. -
Development of Radically Enhanced Alnico Magnets (Dream) for Traction Drive Motors Iver E
Development of Radically Enhanced alnico Magnets (DREaM) for Traction Drive Motors Iver E. Anderson (PI) Matthew J. Kramer (Co-PI) Ames Laboratory (USDOE) June 19, 2018 Project ID # ELT015 This presentation does not contain any proprietary, confidential, or otherwise restricted information Overview Barriers & Targets* . High energy density permanent magnets (PM) needed for compact, and power Timeline density >50 kW/L). Reduced cost (<$3.3/kW): Efficient (>94%) • Start – October 2014 motors require aligned magnets with net- shape and simplified mass production. • Finish - September 2018 . RE Minerals: Rising prices of rare earth 85% Complete (RE) elements, price instability, and looming shortage, especially Dy. Performance & Lifetime: High temperature Budget tolerance (180-200˚C) and long life (15 yrs.) needed for magnets in PM motors. • Total funding - DOE share 100% • FY 17 Funding - $1400K Partners • Baldor, Carpenter, U. Wisconsin, • FY 18 (plan) Funding - $700K NREL, Ford, GM, UQM, (collaborators) • ORNL, U. Nebraska, Arnold Magnetic Tech. (DREaM subcontractors) • Project lead: Ames Lab *2025 VT Targets 2 Project Relevance/Objectives To meet 2025 goals for enhanced specific power, power density, and reduced (stable) cost with mass production capability for advanced electric drive motors, improved alloys and processing of permanent magnets (PM) must be developed. Likely rising RE cost trend and unpredictable import quotas (by China) for RE supplies (particularly Dy) motivates this research effort to improve (Fe-Co)-based alnico permanent magnet alloys (with reduced Co) and processing methods to achieve high magnetic strength (especially coercivity) for high torque drive motors. Objectives for the fully developed PM material: Provide competitive performance in advanced drive motors, compared to IPM motors with RE-PM. -
Permanent Magnet Servomotor and Induction Motor Considerations
Permanent Magnet Servomotor and Induction Motor Considerations Kollmorgen B-104 PM Brushless Servomotor at 0.4 HP Kollmorgen M-828 PM Brushless Rotor Kollmorgen B-802 PM Brushless Servomotor at 15 HP Kollmorgen B-808 PM Brushless Rotor Permanent Magnet Servomotor and Induction Motor Considerations 1 Lee Stephens, Senior Motion Control Engineer Permanent Magnet Servomotor and Induction Motor Considerations Motion long considered a mainstay of induction motors, encroachment in the area of 50 HP and greater have been seen recently for some applications by permanent magnet (PM) servomotors. These applications usually have dynamic considerations that require position-time closed loop and high accelerations. When accelerating large loads, permanent magnet servomotors can work with very high load to inertia ratios and still maintain performance requirements. Having a lower inertia typically will allow for less permanent magnet motor can result in a greater torque energy wasted within the motor. Torque (τ), is the density than an equivalent induction system. If size product of inertia (j) and rotary acceleration (α). If you matters, then perhaps a system should use one require inertia matching, ½ of your energy is wasted technology over another. Speaking of size, the inertia accelerating the motor alone. If the inertia ratio from ratio can be an important figure of merit should motor to load is large, then control schemes must be dynamic needs arise. If you are going to have high dynamic enough to prevent the larger load from driving accelerations and decelerations, the size of the rotor the motor as opposed to the motor controlling the load. will significantly increase the inertia and decrease the Tradeoffs and knowing what can be negotiated. -
Stirring___Mixing__Shaking___H
MAGNETIC STIRRER - “with hot plate” Explosion proof, maintenance free brushless DC motor with low noise level offers a stirring volume up to 20 lt with a smooth start and quick stop. Ceramic top plate guarantees perfect chemical resistance against acids. Also provides impact resistant, easily cleanable, scratch proof surface with excellent heat distribution. Integrated design of the heater and the top plate provides excellent heat transfer rate and quick heat up capability. Hermetically sealed aluminium alloy housing protects all mechanical and electronic components from aggressive effects and guarantees safety with a long life time. Electronic speed control from 100 to 1500 rpm provides a gentle revolution and precise stirring speed. PID temperature technology enables excellent heating control from ambient temperature to 550°C. Offers integrated temperature control (+/- 0,2°C accuracy) with external PT1000 temperature sensor and support rod. Overheat protection circuit turns off the heater if the top plate temperature reaches 580°C for any reason. Hot surface warning display indicates any residual heat even if switched off. LCD display will show “HOT” if hotplate temperature is over 50°C. Large LCD panel for simultaneous display for set & actual temperature and set & actual speed. Special software enables control and documentation of all values via RS232 interface. Supplied complete with PT1000 temperature sensor, support rod and fixing clamp. Explosion proof, maintenance free catalogue number 613.06.001 brushless DC motor with low noise level offers a stirring volume up to 20 dimensions / weight (mm / kg) 215 x 360 x 112 / 5,3 lt with a smooth start and quick stop. -
Control System Lab Lab Manual
CONTROL SYSTEM LAB (EC-616-F) CONTROL SYSTEM LAB (EC-616-F) LAB MANUAL VI SEMESTER Department of Electronics & Computer Engg Dronacharya College of Engineering Khentawas, Gurgaon – 123506 CONTROL SYSTEM LAB (EC-616-F) CONTROL SYSTEM LIST OF EXPERIMENTS PAGE S. NO NAME OF THE EXPERIMENT NO. 1. TO STUDY A.C SERVO MOTOR AND PLOT ITS 1 TORQUE SPEED CHARACTERISTICS. TO STUDY D.C SERVO MOTOR AND PLOT ITS 5 2. TORQUE SPEED CHARACTERISTICS. TO STUDY THE MAGNETIC AMPLIFIER AND PLOT ITS 8 LOAD CURRENT V/S CONTROL CURRENT 3. CHARACTERISTIC FOR (A)SERIES CONNECTED MODE (B)PARALLEL CONNECTED MODE. TO PLOT THE LOAD CURRENT V/S CONTROL 11 4. CURRENT CHARACTERISTICS FOR SELF EXCITED MODE OF THE MAGNETIC AMPLIFIER. 5. TO STUDY LEAD LAG COMPENSATOR AND DRAW 14 MAGNITUDE AND PHASE PLOTS. TO STUDY A STEPPER MOTOR & EXECUTE 17 MICROPROCESSOR OR COMPUTER BASED CONTROL 6. OF THE SAME BY CHANGING NUMBER OF STEPS, DIRECTION OF ROTATION & SPEED. TO IMPEMENT A PID CONTROLLER FOR LEVEL 20 7. CONTROL OF A PILOT PLANT TO STUDY THE BASIC OPEN LOOP AND CLOSED LOOP 23 8. CONTROL SYSTEM. TO STUDY WATER LEVEL CONTROL USING 26 9. INDUSTRIAL PLC. TO STUDY THE MATLAB PACKAGE FOR SIMULATION 29 10. OF CONTROL SYSTEM DESIGN. CONTROL SYSTEM LAB (EC-616-F) EXPERIMENT NO: 1 AIM: - To study AC servo motor and plot its torque speed Characteristics. APPARATUS REQUIRED: - AC Servo Motor Setup, Digital Multimeter and Connecting Leads. THEORY: - AC servomotor has best use for low power control applications. Its important parameters are speed – torque characteristics. An AC servomotor is basically a two phase induction motor which consist of two stator winding oriented 90* electrically apart. -
Servomotor Parameters and Their Proper Conversions for Servo Drive Utilization and Comparison
Servomotor Parameters and their Proper Conversions for Servo Drive Utilization and Comparison Servomotor Parameters and their Proper Conversions for Servo Drive Utilization and Comparison 1 Hurley Gill, Senior Application / Systems Engineer Servomotor Parameters and their Proper Conversions for Servo Drive Utilization and Comparison Utilization of servomotor parameters in their correct units of measure as defined by the drive manufacturer is imperative for achieving desired mechanism performance. But without proper understanding of motor and drive parameter details relative to their defined terms, units, nomenclature and the calculated conversions between them, incorrect units are likely to be applied which complicate both machine design development and the manufacturing process. This white paper demonstrates exactly how and 6-step (i.e. trapezoidal commutation). While machine designers can overcome challenges most servomotor parameters are presented in one around servomotor parameters and apply them of three ways, they are often mixed between the correctly for any motor or drive to meet specific two different electronic commutation methods. requirements. A customary standard set of servo (Refer to Motor Parameters Conversion Table on units is thoroughly explained together with their page 6.) typical nomenclature and the applicable conversions between them. Typical terminologies used to describe While the motor parameter data entered into the servomotors are: Brushless DC Motor (BDCM or servo drive must be in the units that the designer BLDCM) Servo, Brushless DC/AC Synchronous specifically intended, there are often differences Servomotor, AC Permanent Magnet (PM) Servo between this data and their defined corresponding and other similar naming conventions. Most of units of measure presented on a motor datasheet. -
S.No Reg. No Company Name 1 2 AHMEDABAD MANUFACTURING and CALICO PRINTING CO
LIST OF DEFAULTING COMPANIES IN GUJRAT S.No Reg. No Company_Name 1 2 AHMEDABAD MANUFACTURING AND CALICO PRINTING CO. LTD. 2 3 GUJARAT GINNING & MFG CO.LIMITED. 3 7 THE ARYODAYA SPG & WVG.CO.LIMITED. 4 8 40817HCHOWK & AHMEDABAD MFG CO.LIMITED. 5 9 RAJNAGAR SPG & WVG MFG.CO.LIMITED. 6 10 HMEDABAD COTTON MFG. CO.LIMITED. 7 12 12DISPLAY STATUSSTEEL INDUSTRIES PVT. LTD. 8 18 ISHWER COTTON G.N.& PRES.CO.LIMITED. 9 22 THE AHMEDABAD NEW COTTON MILLS CO.LIMITED. 10 25 BHARAT KHAND TEXTILE MANUFACTURING CO LTD 11 27 HIMABHAI MANUFACTURING CO LTD 12 29 JEHANGIR VAKIL MILLS CO PVT LTD 13 30 GUJARAT OIL MILL & MFG CO LTD 14 31 RUSTOMJI MANGALDAS & COMPANY LTD 15 34 FINE KNITTING CO LTD 16 40 AHMEDABAD LAXMI COTTON MILLS CO.LIMITED. 17 42 AHMEDABAD KAISER-I-HIND MILLS CO LTD 18 45 AHMEDABAD NEW TEXTILE MILS CO LTD 19 47 SHRI VIVEKANAND MILLS LTD 20 49 MARSDEN SPINNING & MANUFACTURING CO LTD 21 50 ASHOKA MILLS LTD. 22 54 AHMEDABAD CYCLE & MOTORS TRADING CO PVT LTD 23 68 SHRI AMRUTA MILLS LTD 24 78 VIJAY MILLS CO LTD 25 79 SHRI ARBUDA MILLS LTD. 26 81 DHARWAR ELECTRICAL INDUSTRIES LTD 27 85 ANANTA MILLS LTD 28 87 BHIKABHAI JIVABHAI & CO PVT LTD 29 89 J R VAKHARIA & SONS PVT LTD 30 99 BIHARI MILLS LIMITED 31 101 ROHIT MILLS LTD 32 106 AHMEDABAD FIBRE-SALES & SUPPLIES LTD 33 107 GUJARAT PAPER MILLS LTD 34 109 IDEAL MOTORS LTD 35 110 MODEL THEATRES PVT LTD 36 115 HIMATLAL MOTILAL & CO LTD.(IN LIQ.) 37 116 RAMANLAL KANAIYALAL & CO LTD.(LIQ).