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Everything You Need to Know About Special Electrical Machines by Srinivasan PDF Free 171



Special Electrical Machines by Srinivasan PDF Free 171




Introduction




If you are an electrical engineering student or a professional who wants to learn more about special electrical machines, you might have heard of the book "Special Electrical Machines" by Dr. K. Srinivasan. This book is one of the most comprehensive and authoritative sources of information on this topic, covering various types of special electrical machines, their working principles, characteristics, applications, and design aspects. But what are special electrical machines, why are they important, and who is Srinivasan and what is his book about? In this article, we will answer these questions and also show you how to download the PDF of Srinivasan's book for free.




special electrical machines by srinivasan pdf free 171


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What are special electrical machines?




Special electrical machines are a class of electrical machines that have some unique features or characteristics that make them different from conventional electrical machines such as induction motors, synchronous motors, or DC motors. These machines are designed to meet specific requirements or challenges in various fields such as aerospace, robotics, electric vehicles, renewable energy, etc. Some examples of special electrical machines are switched reluctance motors, permanent magnet brushless DC motors, stepper motors, linear motors, etc.


Why are they important?




Special electrical machines are important because they offer some advantages over conventional electrical machines in terms of efficiency, performance, reliability, cost-effectiveness, environmental friendliness, etc. For instance, switched reluctance motors have simple and robust construction, high torque density, wide speed range, and low maintenance cost. Permanent magnet brushless DC motors have high efficiency, low noise, high power density, and precise speed control. Stepper motors have high accuracy, repeatability, and resolution in position control. These advantages make special electrical machines suitable for various applications that require high performance, low energy consumption, or precise control.


Who is Srinivasan and what is his book about?




Dr. K. Srinivasan is a professor emeritus at the Department of Electrical Engineering at Anna University in Chennai, India. He has more than 40 years of teaching and research experience in the field of electrical machines and drives. He has published more than 100 papers in national and international journals and conferences and has authored several books on electrical engineering topics. He is also a fellow of the Institution of Engineers (India) and a life member of the Indian Society for Technical Education.


His book "Special Electrical Machines" was first published in 2008 by PHI Learning Pvt Ltd. It is a comprehensive textbook that covers various types of special electrical machines such as switched reluctance motors, permanent magnet brushless DC motors, stepper motors, linear induction motors, linear synchronous motors, etc. The book also covers the topics of power electronic converters, control techniques, and design aspects of these machines. The book is written in a clear and concise manner, with numerous examples, diagrams, tables, and solved problems. The book is suitable for undergraduate and postgraduate students of electrical engineering as well as practicing engineers and researchers who want to learn more about special electrical machines.


Types of special electrical machines




In this section, we will briefly describe three types of special electrical machines that are covered in Srinivasan's book: switched reluctance motors, permanent magnet brushless DC motors, and stepper motors. We will explain their working principles, advantages and disadvantages, and applications.


Switched reluctance motors




A switched reluctance motor (SRM) is a type of special electrical machine that operates on the principle of variable reluctance. It consists of a stator with salient poles and a rotor with salient poles. The stator poles are wound with coils that are connected to a power electronic converter. The rotor poles are not wound and have no permanent magnets or brushes. The torque is produced by the tendency of the rotor to align with the stator poles that are energized by the converter. The speed and torque of the SRM can be controlled by varying the current and the timing of the converter.


Working principle




The working principle of an SRM can be explained as follows:


  • The converter energizes one or more stator poles that are closest to the rotor poles.



  • The rotor poles are attracted to the stator poles due to the magnetic attraction force.



  • The rotor rotates until it aligns with the stator poles.



  • The converter switches off the current to the stator poles before the rotor reaches alignment.



  • The rotor continues to rotate due to inertia and residual magnetism.



  • The converter energizes the next set of stator poles that are closest to the rotor poles.



  • The process repeats until the desired speed and torque are achieved.



Advantages and disadvantages




Some of the advantages of SRMs are:


  • They have simple and robust construction, with no brushes, commutators, slip rings, or permanent magnets.



  • They have high torque density, wide speed range, high efficiency, and low maintenance cost.



  • They can operate in harsh environments, such as high temperature, high humidity, dust, etc.



  • They have good fault tolerance and can operate with one or more phases open.



Some of the disadvantages of SRMs are:


  • They have high acoustic noise and vibration due to the pulsating torque and magnetic forces.



  • They have high torque ripple and low power factor due to the discontinuous current and variable reluctance.



  • They require complex power electronic converters and control techniques to achieve smooth operation and performance.



  • They have high electromagnetic interference (EMI) due to the high switching frequency and harmonics of the converter.



Applications




Some of the applications of SRMs are:


  • Electric vehicles, such as hybrid cars, electric bikes, etc.



  • Aerospace systems, such as aircraft actuators, satellite thrusters, etc.



  • Industrial systems, such as pumps, compressors, fans, blowers, etc.



  • Domestic appliances, such as washing machines, vacuum cleaners, etc.



Permanent magnet brushless DC motors




A permanent magnet brushless DC motor (PMBLDCM) is a type of special electrical machine that operates on the principle of electromechanical energy conversion. It consists of a stator with three-phase windings and a rotor with permanent magnets. The stator windings are connected to a three-phase power electronic converter that supplies DC voltage with variable frequency and amplitude. The rotor magnets generate a constant magnetic field that interacts with the stator windings. The torque is produced by the Lorentz force acting on the current-carrying conductors in the stator windings. The speed and torque of the PMBLDCM can be controlled by varying the voltage and frequency of the converter.


Working principle




The working principle of a PMBLDCM can be explained as follows:



  • The converter supplies DC voltage to one pair of stator windings that are aligned with two opposite rotor magnets.



  • The stator windings generate a magnetic field that opposes the rotor magnetic field.



of stator windings that are aligned with two opposite rotor magnets.


  • The converter switches the DC voltage to the next pair of stator windings that are aligned with two opposite rotor magnets.



  • The process repeats until the desired speed and torque are achieved.




Advantages and disadvantages




Some of the advantages of PMBLDCMs are:



  • They have high efficiency, low noise, high power density, and precise speed control.



  • They have no brushes, commutators, or slip rings, which reduces friction, wear, and maintenance cost.



  • They have low heating and high thermal stability due to the absence of current in the rotor.



  • They have good dynamic response and wide speed range due to the low inertia of the rotor.




Some of the disadvantages of PMBLDCMs are:



  • They have high initial cost and complexity due to the need for permanent magnets, power electronic converters, and sensors.



  • They have limited torque capability and speed regulation due to the dependency on the permanent magnet flux.



  • They have demagnetization and cogging effects due to the interaction of the permanent magnet field and the stator slots.



  • They have EMI issues due to the high switching frequency and harmonics of the converter.




Applications




Some of the applications of PMBLDCMs are:



  • Electric vehicles, such as electric cars, electric bikes, etc.



  • Robotics systems, such as industrial robots, humanoid robots, etc.



  • Medical systems, such as artificial heart pumps, ventilators, etc.



  • Consumer electronics, such as computer hard drives, CD/DVD players, etc.




Stepper motors




A stepper motor is a type of special electrical machine that operates on the principle of discrete position control. It consists of a stator with multiple poles and a rotor with permanent magnets or teeth. The stator poles are wound with coils that are connected to a power electronic converter that supplies DC pulses with variable frequency and sequence. The rotor magnets or teeth align with the stator poles that are energized by the converter. The torque is produced by the magnetic attraction force between the rotor and stator poles. The position and speed of the stepper motor can be controlled by varying the number and order of the pulses supplied by the converter.


Working principle




The working principle of a stepper motor can be explained as follows:



  • The converter supplies a DC pulse to one or more stator poles that are aligned with one or more rotor magnets or teeth.



  • The rotor rotates until it aligns with the next set of stator poles that are aligned with one or more rotor magnets or teeth.



  • The converter supplies another DC pulse to the next set of stator poles that are aligned with one or more rotor magnets or teeth.



  • The process repeats until the desired position and speed are achieved.



Advantages and disadvantages




Some of the advantages of stepper motors are:


  • They have high accuracy, repeatability, and resolution in position control.



  • They have no feedback sensors or closed-loop control systems required for position control.



  • They have simple and robust construction, with no brushes, commutators, or slip rings.



  • They have low cost and easy availability due to their widespread use in various applications.



Some of the disadvantages of stepper motors are:


  • They have low efficiency, high noise, and high vibration due to the discrete steps and magnetic forces.



  • They have low torque and speed capability due to the dependency on the step angle and pulse frequency.



  • They have resonance and instability issues due to the interaction of the mechanical and electrical characteristics.



  • They have EMI issues due to the high switching frequency and harmonics of the converter.



Applications




Some of the applications of stepper motors are:


  • CNC machines, such as milling machines, lathes, etc.



  • Printing systems, such as printers, scanners, plotters, etc.



  • Textile systems, such as sewing machines, knitting machines, etc.



  • Camera systems, such as autofocus, zoom, etc.



How to download the PDF of Srinivasan's book for free?




If you are interested in learning more about special electrical machines and want to download the PDF of Srinivasan's book for free, you might be wondering how to do that. In this section, we will discuss the legal and ethical issues of downloading pirated books, the possible sources of downloading the PDF for free, and the risks and challenges of downloading the PDF for free.


The legal and ethical issues of downloading pirated books




Before you decide to download the PDF of Srinivasan's book for free, you should be aware of the legal and ethical issues of downloading pirated books. Pirated books are books that are illegally copied, distributed, or sold without the permission of the author or the publisher. Downloading pirated books is a form of intellectual property theft that violates the copyright laws and the moral rights of the author and the publisher. Downloading pirated books can have negative consequences for both the downloader and the creator of the book.


For the downloader, downloading pirated books can result in:


  • Legal consequences and penalties, such as fines, lawsuits, or imprisonment.



  • Moral guilt and loss of reputation, as downloading pirated books is considered unethical and dishonest.



  • Lack of support and appreciation for the author and the publisher, as downloading pirated books deprives them of their rightful income and recognition.



For the creator of the book, downloading pirated books can result in:


  • Loss of revenue and profit, as downloading pirated books reduces the sales and royalties of the book.



  • Loss of motivation and creativity, as downloading pirated books discourages the author from writing more books or improving their quality.



  • Loss of control and protection, as downloading pirated books exposes the book to unauthorized modifications, errors, or plagiarism.



Therefore, downloading pirated books is not only illegal but also unethical and harmful for both the downloader and the creator of the book. It is better to respect the intellectual property rights and support the author and the publisher by buying or borrowing the original book from authorized sources.


The possible sources of downloading the PDF for free




the PDF for free. Some of the possible sources of downloading the PDF for free are: Websites




There are some websites that claim to offer free PDF downloads of various books, including Srinivasan's book. These websites usually have a search engine or a list of categories that allow you to find the book you want. Some examples of these websites are PDF Drive, Z-Library, Free-Ebooks.net, etc.


Torrents




There are some torrents that claim to offer free PDF downloads of various books, including Srinivasan's book. Torrents are peer-to-peer file sharing systems that allow you to download files from other users who have the same file. You need a torrent client software and a torrent file or magnet link to download the file. Some examples of torrent client software are BitTorrent, uTorrent, qBittorrent, etc.


Online libraries




There are some online libraries that claim to offer free PDF downloads of various books, including Srinivasan's book. Online libraries are digital collections of books that can be accessed online or downloaded for offline reading. You need a library card or an account to access the online library. Some examples of online libraries are Open Library, Project Gutenberg, Internet Archive, etc.


The risks and challenges of downloading the PDF for free




If you decide to download the PDF of Srinivasan's book for free from any of the possible sources mentioned above, you should be aware of the risks and challenges of downloading the PDF for free. Downloading the PDF for free can expose you to some problems such as:


Malware and viruses




Some of the sources of downloading the PDF for free may contain malware and viruses that can infect your device and compromise your security and privacy. Malware and viruses can damage your files, steal your data, monitor your activities, or hijack your system. You should always scan the downloaded file with an antivirus software before opening it.


Low quality and incomplete content




Some of the sources of downloading the PDF for free may provide low quality and incomplete content that can affect your learning and understanding. Low quality and incomplete content can have errors, omissions, distortions, or outdated information that can mislead you or confuse you. You should always check the authenticity and accuracy of the downloaded content before using it.


Legal consequences and penalties




Some of the sources of downloading the PDF for free may violate the intellectual property rights of the author and the publisher and expose you to legal consequences and penalties. Legal consequences and penalties can include fines, lawsuits, or imprisonment depending on the severity of the violation and the jurisdiction of the law. You should always respect the intellectual property rights and avoid downloading pirated books.


Conclusion




In this article, we have discussed the topic of "special electrical machines by srinivasan pdf free 171". We have explained what are special electrical machines, why are they important, and who is Srinivasan and what is his book about. We have also described three types of special electrical machines: switched reluctance motors, permanent magnet brushless DC motors, and stepper motors. We have also discussed how to download the PDF of Srinivasan's book for free, along with the legal and ethical issues, the possible sources, and the risks and challenges of doing so.


We hope that this article has provided you with useful information and insights on this topic. If you want to learn more about special electrical machines and Srinivasan's book, we recommend that you buy or borrow the original book from authorized sources and support the author and the publisher.


FAQs




Here are some frequently asked questions (FAQs) about this topic:



  • What is special electrical machine?



A special electrical machine is a class of electrical machine that has some unique features or characteristics that make it different from conventional electrical machines such as induction motors, synchronous motors, or DC motors.


  • What are some examples of special electrical machines?



Some examples of special electrical machines are switched reluctance motors, permanent magnet brushless DC motors, stepper motors, linear motors, etc.


  • Who is Dr. K. Srinivasan?



Dr. K. Srinivasan is a professor emeritus at the Department of Electrical Engineering at Anna University in Chennai, India. He is the author of the book "Special Electrical Machines".


  • What is the book "Special Electrical Machines" about?



The book "Special Electrical Machines" is a comprehensive textbook that covers various types of special electrical machines, their working principles, characteristics, applications, and design aspects.


  • How to download the PDF of Srinivasan's book for free?



There are some possible sources of downloading the PDF of Srinivasan's book for free, such as websites, torrents, or online libraries. However, downloading the PDF for free can have legal and ethical issues, as well as risks and challenges such as malware and viruses, low quality and incomplete content, and legal consequences and penalties.


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