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ارسال در تاريخ جمعه بیست و نهم اردیبهشت 1391 توسط مهندس محمد ناصر هاشم نیا

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مشاور عالي سازمان سنجش آموزش كشور از اعلام نتايج اوليه آزمون دكتري در روز چهارشنبه سوم خرداد ماه خبر داد.

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ارسال در تاريخ سه شنبه بیست و ششم اردیبهشت 1391 توسط مهندس محمد ناصر هاشم نیا

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ارسال در تاريخ یکشنبه بیست و چهارم اردیبهشت 1391 توسط مهندس محمد ناصر هاشم نیا

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ارسال در تاريخ شنبه بیست و سوم اردیبهشت 1391 توسط مهندس محمد ناصر هاشم نیا

Jacek F. Gieras, Chong Wang, Joseph Cho Lai, "Noise of Polyphase Electric Motors"
C..RC | 2005 | ISBN: 0824723813 | 376 pages | PDF | 22,1 MB

Controlling the level of noise in electrical motors is critical to overall system performance. However, predicting noise of an electrical motor is more difficult and less accurate than for other characteristics such as torque-speed. Recent advances have produced powerful computational methods for noise prediction, and Noise of Polyphase Electric Motors is the first book to collect these advances in a single source. It is also the first to include noise prediction for permanent magnet (PM) synchronous motors. Complete coverage of all aspects of electromagnetic, structural, and vibro-acoustic noise makes this a uniquely comprehensive reference. The authors begin with the basic principles of noise generation and radiation, magnetic field and radial forces, torque pulsations, acoustic calculations, as well as noise and vibration of mechanical and acoustic origin. Moving to applications, the book examines in detail stator system vibration analysis including the use of finite element method (FEM) modal analysis; FEM for radial pressure and structural modeling; boundary element methods (BEM) for acoustic radiation; statistical energy analysis (SEA); instrumentation including technologies, procedures, and standards; and both passive and active methods for control of noise and vibration. Noise of Polyphase Electric Motors gathers the fundamental concepts along with all of the analytical, numerical, and statistical methods into a unified reference. It supplies all of the tools necessary to improve the noise performance of electrical motors at the design stage.

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ارسال در تاريخ دوشنبه یازدهم اردیبهشت 1391 توسط مهندس محمد ناصر هاشم نیا

Mohamed E. El-Hawary - Electric Power Applications of Fuzzy Systems
Published: 1998-06-01 | ISBN: 0780311973 | PDF | 376 pages | 17.07 MB

Electrical Engineering Electric Power Applications of Fuzzy Systems Let world-renowned electrical engineers introduce you to the latest developments in the application of one of the fastest growing artificial intelligence techniques for power systems—fuzzy system theory. Compiled and edited by well-known power systems educator Mohamed E. El-Hawary, Electric Power Applications of Fuzzy Systems assembles a distinguished panel of highly regarded experts to bring you original, up-to-date coverage of the applications of fuzzy systems. This volume presents theoretical background material from a practical point of view and then explores a number of applications of fuzzy systems. Each chapter features an informative introduction. Look for succinct, practical discussions on:
Fuzzy sets
Fuzzy controllers
Fuzzy perspectives on power system reliability, condition monitoring, and diagnostics
Ground-breaking chapter on applications in operational planning
Up-to-the-minute chapter on fuzzy applications in deregulated environment
Electric Power Applications of Fuzzy Systems will help you understand how the application of fuzzy theory in power systems is revolutionizing the way we look at many areas of practice. It is essential for power system engineers who want to launch into real-world applications of this increasingly popular technique.

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ارسال در تاريخ دوشنبه یازدهم اردیبهشت 1391 توسط مهندس محمد ناصر هاشم نیا

Irving Gottlieb , "Practical Electric Motor Handbook"
N,,nes | 1997 | ISBN: 0750636386 | 220 pages | PDF | 13,1 MB

Experienced product designers are increasingly expected to be adept at incorporating a range of components into their designs. Students and experimenters too need to look beyond basic circuits and devices to achieve adequate design solutions. For those experienced in engineering design, this is the guide to electric motors.

This book will allow engineers and designers to marry the technologies they know about with motor technology, and hence to incorporate motors into their products. Of the many good books on motors, such as Electric Motors and Drives by Hughes, none offer the engineering professional a tailored guide to motors taking into account their expertise. This book fills that gap.

Irving Gottlieb is a leading author of many books for practising engineers, technicians and students of electronic and electrical engineering.

Practical approach with minimum theory
Covers a core area ignored by many electronics texts
Shows how to incorporate motors into electronic products

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ارسال در تاريخ یکشنبه دهم اردیبهشت 1391 توسط مهندس محمد ناصر هاشم نیا

Benoît Robyns, "Vector Control of Induction Machines: Desensitisation and Optimisation Through Fuzzy Logic (Power Systems)"
Publisher: ///ing**r | ISBN: 085729900X | 2012 | PDF | 248 pages | 12.8 MB

After a brief introduction to the main law of physics and fundamental concepts inherent in electromechanical conversion, Vector Control of Induction Machines introduces the standard mathematical models for induction machines – whichever rotor technology is used – as well as several squirrel-cage induction machine vector-control strategies. The use of causal ordering graphs allows systematization of the design stage, as well as standardization of the structure of control devices. Vector Control of Induction Machines suggests a unique approach aimed at reducing parameter sensitivity for vector controls based on a theoretical analysis of this sensitivity. This analysis naturally leads to the introduction of control strategies that are based on the combination of different controls with different robustness properties, through the use of fuzzy logic supervisors. Numerous applications and experiments confirm the validity of this simple solution, which is both reproducible and applicable to other complex systems. Vector Control of Induction Machines is written for researchers and postgraduate students in electrical engineering and motor drive design.

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ارسال در تاريخ شنبه نهم اردیبهشت 1391 توسط مهندس محمد ناصر هاشم نیا

For one-semester, undergraduate-level courses in Motor Controls, Electric Machines, Power Electronics, and Electric Power. This best-selling text employs a theoretical, practical, multidisciplinary approach to provide introductory students with a broad understanding of modern electric power. The scope of the book reflects the rapid changes that have occurred in power technology over the past few years--allowing the entrance of power electronics into every facet of industrial drives, and expanding the field to open more career opportunities.

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ارسال در تاريخ شنبه نهم اردیبهشت 1391 توسط مهندس محمد ناصر هاشم نیا

Optimization of Photovoltaic Power Systems: Modelization, Simulation and Control By Djamila Rekioua, Ernest Matagne
2012 | 295 Pages | ISBN: 1447123484 | PDF | 7 MB

Photovoltaic generation is one of the cleanest forms of energy conversion available. One of the advantages offered by solar energy is its potential to provide sustainable electricity in areas not served by the conventional power grid. Optimisation of Photovoltaic Power Systems details explicit modelling, control and optimisation of the most popular stand-alone applications such as pumping, power supply, and desalination. Each section is concluded by an example using the MATLAB® and Simulink® packages to help the reader understand and evaluate the performance of different photovoltaic systems. Optimisation of Photovoltaic Power Systems provides engineers, graduate and postgraduate students with the means to understand, assess and develop their own photovoltaic systems. As such, it is an essential tool for all those wishing to specialise in stand-alone photovoltaic systems. Optimisation of Photovoltaic Power Systems aims to enable all researchers in the field of electrical engineering to thoroughly understand the concepts of photovoltaic systems; find solutions to their problems; and choose the appropriate mathematical model for optimising photovoltaic energy.

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ارسال در تاريخ جمعه هشتم اردیبهشت 1391 توسط مهندس محمد ناصر هاشم نیا

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ارسال در تاريخ جمعه هشتم اردیبهشت 1391 توسط مهندس محمد ناصر هاشم نیا

دانلود کتاب طراحی ماشین های الکتریکی

Vishnu Murthy, K. M., "Computer-aided Design of Electrical Machines"
BS Publications | 2008 | ISBN: 144166159X, 8178001462 | 335 pages | PDF | 11 MB

CHAPTER 1
Concept of Computer-Aided Design and
Optimization
1.1 Introduction
A design problem has to be fonnulated considering the various constraints, processes,
availability of materials, quality aspects. cost aspects etc. Constraints can be from
technical, cost or availability aspects. Technical constraints can be from calculation
methods, available process systems, skilled labour, manufacturing facilities, machinery,
or tools etc. Sometimes transport facilities to site also pose problems. If suitable quality
. materials are not available indigenously they may have to be imported, which effects
cost and delivery time.
In designing -any system, accuracy of prediction, economy, quality and delivery
period playa vital role. Basically, a design involves calculating the dimensions of
various components and parts of the machine, weights, material specifications, output
parameters and perfonnance in accordance with specified international standards. The
calculated parameters may not tally with the final tested perfonnance. Hence, design has
to be frozen keeping in view the design analysis as well as the previous operating
experience of search machines.
The practical method in case of bigger machines is to establish a computer program
for the total design incorporating the constraint parameters and running the program for
various alternatives from which final design is selected.
Though the final design may meet all the required specifications, it need not be an
optimal one as regards the weight and cost of the active materials, and certain
perfonnance aspects like efficiency, temperature rise etc.
Various Objective Parameters/or Optimization in an Electrical Machine
(a) Higher Efficiency
(b) Lower weight for given KVA output (Kg/KVA)
(c) Lower Temperature-Rise
(d) Lower Cost
(e) Any other parameter like higher PF for induction motor, higher reactance etc.
Here we have to understand that if an optimized design is finalized keeping in view
of any of the parameters mentioned above, the design may not be optimum for the above
parameters. For example, if a design is selected for higher efficiency, it may not be

optimum in other parameters, maybe the cost is high. Nonnally this is a case where...

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ارسال در تاريخ جمعه هشتم اردیبهشت 1391 توسط مهندس محمد ناصر هاشم نیا

Modeling and High Performance Control of Electric Machines
by John Chiasson
Wiley-IEEE Press | English | 2005 | ISBN: 047168449X | 736 pages | PDF | 26.3 MB

Modeling and High Performance Control of Electric Machines introduces you to both the modeling and control of electric machines. The direct current (DC) machine and the alternating current (AC) machines (induction, PM synchronous, and BLDC) are all covered in detail. The author emphasizes control techniques used for high-performance applications, specifically ones that require both rapid and precise control of position, speed, or torque. You'll discover how to derive mathematical models of the machines, and how the resulting models can be used to design control algorithms that achieve high performance. Graduate students studying power and control as well as practicing engineers in industry will find this a highly readable text on the operation, modeling, and control of electric machines.

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ارسال در تاريخ پنجشنبه هفتم اردیبهشت 1391 توسط مهندس محمد ناصر هاشم نیا

Ion Boldea, Syed A. Nasar, "The Induction Machine Handbook"
CRC | 2001 | ISBN: 0849300045 | 950 pages | PDF | 27,4 MB

Often called the workhorse of industry, the advent of power electronics and advances in digital control are transforming the induction motor into the racehorse of industrial motion control. Now, the classic texts on induction machines are nearly three decades old, while more recent books on electric motors lack the necessary depth and detail on induction machines. The Induction Machine Handbook fills industry's long-standing need for a comprehensive treatise embracing the many intricate facets of induction machine analysis and design. Moving gradually from simple to complex and from standard to new knowledge, it includes an extended presentation of windings parameters as influenced by frequency and saturation, offers a complete account of standard and new testing methods, and devotes several chapters to the design of variable-speed induction motors. With a coherence and consistency not attainable in contributed works, this handbook draws on the authors' long experience in the field and takes full advantage of its rich literature. The presentation of all types of induction machines complete with many numerical examples, digital simulations, and design sample cases make the Induction Machine Handbook a comprehensive, up-to-date resource ideal for both for practicing and student engineers.

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ارسال در تاريخ پنجشنبه هفتم اردیبهشت 1391 توسط مهندس محمد ناصر هاشم نیا

Control of Induction Motors
Publisher: Academic Press | Pages: 228 | 2000-09-29 | ISBN 0127015108 | PDF | 7 MB

This book is a comprehensive reference source for practicing engineers and students specializing in electric power engineering and industrial electronics. It will illustrate the state of the art in induction motors. Beginning with characteristics and basic dynamic models of induction motors, and progressing to low- and high- performance drive systems. The book will be rich in useful information, without an excessive mathematical burden. Computer simulations resulting in mock oscillograms of physical quantities are used for illustration of basic control concepts.

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ارسال در تاريخ پنجشنبه هفتم اردیبهشت 1391 توسط مهندس محمد ناصر هاشم نیا

Riccardo Marino, Patrizio Tomei, Cristiano M. Verrelli, "Induction Motor Control Design"
Springer | 2010 | ISBN: 1849962839 | 351 pages | PDF | 14,6 MB

Nonlinear and Adaptive Control Design for Induction Motors is a unified exposition of the most important steps and concerns in the design of estimation and control algorithms for induction motors. A single notation and modern nonlinear control terminology is used to make the book accessible to readers who are not experts in electric motors at the same time as giving a more theoretical control viewpoint to those who are. In order to increase readability, the book concentrates on the induction motor, eschewing the much more complex and less-well-understood control of asynchronous motors. The concepts of stability and nonlinear control theory are presented in appendices. Important features of the book include: • thorough coverage of speed sensorless control, important for applications; • a wide-ranging discussion of nonlinear adaptive controls containing parameter estimation algorithms; • coverage of the design of adaptive observers and parameter estimators which can complement state feedback design techniques; • comparative simulations of different control algorithms on the same motor to clarify the advantages and drawbacks of each. The content is organized in a pedagogical, progressive exposition starting from basic assumptions, structural properties, modelling, state feedback control and estimation algorithms, and moving on to more complex output feedback control algorithms and modelling for speed sensorless control. Adaptive output feedback controls are based on stator current measurements, both alone and in connection with rotor speed. The induction motor exhibits many typical and unavoidable nonlinear features and so the material presented in this volume will be of value to engineers engaged in the control of electric motors and to a broader audience interested in nonlinear control design.

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ارسال در تاريخ چهارشنبه ششم اردیبهشت 1391 توسط مهندس محمد ناصر هاشم نیا

۱۱ اردیبهشت‌ماه؛ آغاز مجدد ثبت‌نام از متقاضیان ارز دانشجویی

مسلمی در گفت‌وگو با فارس خبرداد:

۱۱ اردیبهشت‌ماه؛ آغاز مجدد ثبت‌نام از متقاضیان ارز دانشجویی

خبرگزاری فارس: مدیرکل بورس و امور دانشجویان خارج وزارت علوم گفت: از روز دوشنبه، 11 اردیبهشت‌ماه ثبت‌نام‌های جدید متقاضیان دریافت ارز دانشجویی مجدداً در سامانه نشا آغاز می‌شود.

حسن مسلمی نائینی مدیرکل بورس و امور دانشجویان خارج وزارت علوم به خبرنگار گروه دانشگاه خبرگزاری فارس، گفت: در روزهای اخیر اداره کل بورس و امور دانشجویان خارج وزارت علوم نمی‌تواند پاسخگوی دانشجویان باشد؛ البته این اداره در تلاش است تا در روزهای آینده نقایص را رفع کرده و با ساماندهی رویه صدور معرفی نامه‌ها و ارتقای سامانه نشا اقدامات خود را پیگیری کند.

به گفته مسلمی، برای ارتقای پاسخگویی، ثبت‌نام و خدمات رسانی الکترونیکی و اینترنتی از طریق این سامانه متوقف شده و به هیچ تقاضایی پاسخ داده نمی‌شود.

مدیرکل بورس و امور دانشجویان خارج وزارت علوم خاطرنشان کرد: از روز دوشنبه، 11 اردیبهشت‌ماه ثبت‌نام‌های جدید متقاضیان دریافت ارز دانشجویی مجدداً در سامانه نشا آغاز می‌شود.

ارسال در تاريخ چهارشنبه ششم اردیبهشت 1391 توسط مهندس محمد ناصر هاشم نیا

دانلود کتاب تکنولوژی برق تراژا تمامی جلد ها

B.L. Theraja and A.K. Theraja, "A Textbook of Electrical Technology Volume I - IV 2005 Edition"
ISBN: n/a | Various | Publisher: S. Chand | 2005 | PDF | 66Mb

This is A Textbook of Electrical Technology Volume I - IV 2005 First Multi-coloured Edition by B.L. Theraja and A.K. Theraja in pdf format.

ارسال در تاريخ چهارشنبه ششم اردیبهشت 1391 توسط مهندس محمد ناصر هاشم نیا

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ارسال در تاريخ سه شنبه پنجم اردیبهشت 1391 توسط مهندس محمد ناصر هاشم نیا

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ارسال در تاريخ شنبه دوم اردیبهشت 1391 توسط مهندس محمد ناصر هاشم نیا

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ارسال در تاريخ شنبه دوم اردیبهشت 1391 توسط مهندس محمد ناصر هاشم نیا

ساخت الكتروموتور 4500 كيلووات توسط ايدرو

قائم مقام سازمان گسترش و نوسازي صنايع ايران گفت: مهندسان شركت جمكو (از شركت‌هاي تابع ايدرو) با طراحي و ساخت الكتروموتور فشار قوي 4000 تا 4500 كيلووات مخصوص صنايع سيمان و فولاد انحصار شركت هاي اروپاييِ سازنده اين نوع الكتروموتورها را شكستند.

به گزارش ایدرو، محمدعلي وفايي افزود: اين الكتروموتور از نوع روتور سيم پيچي بوده و يك موتور با قدرت بالا محسوب مي‌شود و ايران جزو معدود كشورهايي است كه به فن‌آوري ساخت اين موتور دست مي‌يابد.

به گفته وي، شركت هاي اروپايي براي ساخت هر دستگاه از اين الكتروموتورها 15 ميليارد ريال و هشت ماه زمان طلب مي كردند، اما شركت جمكو مي تواند با يك چهارم اين مبلغ، موتور را ظرف زمان كمتري تحويل دهد.

قائم مقام ايدرو تصريح كرد: حدود 1500 دستگاه از اين الكتروموتورها در برخي از صنايع خاص كشور استفاده مي شود كه از اين پس با طراحي و ساخت و تعميرات آن در داخل كشور، صنايع كشور از واردات و يا استفاده از محصولات يا خدمات خارجي در اين زمينه بي نياز مي شوند.

طبق اعلام ايدرو، شركت ايراني مراحل تست اين الكتروموتور را با موفقيت پشت سر گذاشته و آماده تحويل آن به شركت گل گهر سيرجان، نخستين سفارش دهنده اين محصول است و صادرات دو دستگاه ديگر از اين الكتروموتورها را نيز به كشور تركمنستان در دست اقدام دارد.

ارسال در تاريخ چهارشنبه سی ام فروردین 1391 توسط مهندس محمد ناصر هاشم نیا

نتیجه اولیه آزمون کارشناسی ارشد 91 اعلام می‌شود

نتیجه اولیه آزمون کارشناسی ارشد ۹۱ پنجشنبه ۴ خرداد از طریق سایت سازمان سنجش اعلام می شود.

به گزارش باشگاه خبرنگاران، دکتر حسین توکلی مشاور عالی سازمان سنجش آموزش کشور افزود: در آزمون کارشناسی ارشد سال ۹۱ تعداد ۹۳۰ هزار و ۲۱۵ نفر تقاضانامه الکترونیکی ثبت نام را تکمیل کردند که از این تعداد ۴۷۲ هزار ۸۹۴ نفر زن و ۴۵۷ هزار و ۳۲۱ نفر مرد بودند و این آمار نسبت به سال گذشته ۵۸ هزار و ۴۰۹ نفر بیشتر شده بود.

وی گفت: نتایج اولیه آزمون کارشناسی ارشد سال ۹۱ براساس برنامه زمانی پیش بینی شده به صورت کارنامه ۴ خرداد ماه برای اطلاع داوطلبان بر روی سایت سازمان سنجش قرار داده می شود و داوطلبان می توانند از ۵ تا ۹ خرداد در صورت واجد شرایط شدن با دریافت دفترچه راهنمای انتخاب رشته، انتخاب های خود را به ترتیب اولویت در فرم انتخاب رشته درج کنند.

توکلی خاطرنشان کرد: فهرست اسامی پذیرفته شدگان نهایی نیمه اول شهریور ماه اعلام می شود.

ارسال در تاريخ چهارشنبه سی ام فروردین 1391 توسط مهندس محمد ناصر هاشم نیا

کد جست و جوی گوگل

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