Electric Drives Concepts and Applications by Vedam Subrahmanyam: A Must-Read for Students and Engineers - Download from Rapidshare MAXSPEED
Electric Drives Concepts and Applications by Vedam Subrahmanyam Rapidshare MAXSPEED
If you are looking for a comprehensive and up-to-date book on electric drives, you might want to check out Electric Drives Concepts and Applications by Vedam Subrahmanyam. This book covers the theory, design, analysis, and operation of various types of electric drives, with an emphasis on practical applications. In this article, we will give you an overview of the book's contents, as well as a link to download it from Rapidshare MAXSPEED, a fast and reliable file-sharing service. Read on to find out more!
electric drives concepts and applications by vedam subrahmanyam rapidshare MAXSPEED
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Introduction
Before we dive into the details of the book, let's first understand what electric drives are and why they are important. We will also introduce the author of the book, Vedam Subrahmanyam, who is a renowned expert in the field of electric drives.
What are electric drives?
Electric drives are systems that use electric motors to convert electrical energy into mechanical energy and control the motion of machines or devices. Electric drives can be classified into two categories: constant speed drives and variable speed drives. Constant speed drives operate at a fixed speed regardless of the load or input conditions. Variable speed drives can adjust the speed of the motor according to the load or input conditions, which improves the performance and efficiency of the system.
Why are electric drives important?
Electric drives have many advantages over other types of drives, such as hydraulic or pneumatic drives. Some of these advantages are:
Electric drives are more energy-efficient, as they reduce the losses due to friction, leakage, or heat generation.
Electric drives are more reliable, as they have fewer moving parts and require less maintenance.
Electric drives are more flexible, as they can be easily controlled and integrated with other systems.
Electric drives are more environmentally friendly, as they do not produce noise or emissions.
Because of these benefits, electric drives are widely used in various industries, such as manufacturing, transportation, renewable energy, etc.
Who is Vedam Subrahmanyam?
Vedam Subrahmanyam is a professor emeritus at the Indian Institute of Technology Madras. He has over 40 years of teaching and research experience in the field of electric drives. He has authored several books and papers on electric drives, power electronics, control systems, etc. He has also received many awards and honors for his contributions to the field, such as the IEEE Fellow, the IETE Lifetime Achievement Award, the INAE Distinguished Professor Award, etc. He is widely regarded as one of the leading authorities on electric drives in India and abroad.
Electric Drives Concepts
In this section, we will briefly review some of the basic concepts of electric drives, such as the types, components, and performance of electric drives. These concepts are explained in detail in the book by Vedam Subrahmanyam.
Types of electric drives
Electric drives can be classified into three types based on the type of power converter and motor used: DC drives, AC drives, and special drives.
DC drives
DC drives use a DC power converter and a DC motor. The DC power converter can be either a rectifier, which converts AC to DC, or a chopper, which converts DC to variable DC. The DC motor can be either a separately excited motor, which has independent field and armature windings, or a self-excited motor, which has a common field and armature winding. DC drives have the advantages of simple control, high torque, and fast response. However, they also have some disadvantages, such as high maintenance cost, low efficiency, and poor power factor.
AC drives
AC drives use an AC power converter and an AC motor. The AC power converter can be either an inverter, which converts DC to variable AC, or a cycloconverter, which converts AC to variable AC. The AC motor can be either an induction motor, which has a squirrel-cage or wound rotor, or a synchronous motor, which has a permanent magnet or wound rotor. AC drives have the advantages of low maintenance cost, high efficiency, and good power factor. However, they also have some disadvantages, such as complex control, low torque, and slow response.
Special drives
Special drives use a special power converter and a special motor. The special power converter can be either a matrix converter, which converts AC to variable AC without using a DC link, or a multilevel converter, which uses several voltage levels to reduce harmonics and losses. The special motor can be either a brushless DC motor, which has a permanent magnet rotor and an electronic commutator, or a switched reluctance motor, which has a salient pole rotor and no windings. Special drives have the advantages of high performance, high reliability, and high flexibility. However, they also have some disadvantages, such as high cost, high complexity, and high noise.
Components of electric drives
Electric drives consist of three main components: power converter, motor, and controller. These components are interconnected by power cables and signal wires.
Power converter
The power converter is the device that converts the input power supply into the desired output voltage and current for the motor. The power converter can be either unidirectional or bidirectional. A unidirectional power converter can only transfer power from the input to the output. A bidirectional power converter can transfer power in both directions. The power converter can also be either single-phase or three-phase. A single-phase power converter uses one phase of the input supply. A three-phase power converter uses three phases of the input supply.
Motor
The motor is the device that converts the electrical energy from the power converter into mechanical energy for the load. The motor can be either linear or rotary. A linear motor produces linear motion along a track. A rotary motor produces rotational motion around an axis. The motor can also be either constant speed or variable speed. A constant speed motor operates at a fixed speed regardless of the load or input conditions. A variable speed motor operates at different speeds according to the load or input conditions.
Controller
The controller is the device that regulates the operation of the power converter and the motor according to the desired output characteristics. The controller can be either analog or digital. An analog controller uses analog signals and components to perform control functions. A digital controller uses digital signals and components to perform control functions. The controller can also be either open-loop or closed-loop. An open-loop controller does not use feedback from the output to adjust the input. A closed-loop controller uses feedback from the output to adjust the input.
Performance of electric drives
The performance of electric drives can be evaluated by various parameters, such as speed control, torque control, efficiency and losses.
Speed control
by different methods, such as armature voltage control, field flux control, frequency control, etc. Speed control can also be either scalar or vector. Scalar speed control only considers the magnitude of the voltage and frequency. Vector speed control considers both the magnitude and the angle of the voltage and frequency.
Torque control
Torque control is the ability of an electric drive to maintain or vary the torque of the motor according to the load or input conditions. Torque control can be achieved by different methods, such as current control, slip control, direct torque control, etc. Torque control can also be either scalar or vector. Scalar torque control only considers the magnitude of the current and slip. Vector torque control considers both the magnitude and the angle of the current and slip.
Efficiency and losses
Efficiency and losses are the measures of how well an electric drive converts electrical energy into mechanical energy. Efficiency is the ratio of the output power to the input power. Losses are the difference between the input power and the output power. Efficiency and losses depend on various factors, such as the type and size of the power converter and motor, the operating conditions, the cooling system, etc. Efficiency and losses can be improved by using appropriate design, selection, and optimization techniques.
Electric Drives Applications
In this section, we will briefly review some of the common applications of electric drives in various domains, such as industrial, transportation, and renewable energy. These applications are discussed in detail in the book by Vedam Subrahmanyam.
Industrial applications
Industrial applications are those that use electric drives to power machines or devices that perform various tasks in manufacturing, processing, or service industries. Some examples of industrial applications are:
Pumps and fans
Pumps and fans are devices that move fluids or gases from one place to another. Electric drives are used to control the speed and flow rate of pumps and fans according to the demand or process requirements. Electric drives can improve the efficiency and reliability of pumps and fans, as well as reduce noise and vibration.
Conveyors and cranes
Conveyors and cranes are devices that transport materials or goods from one place to another. Electric drives are used to control the speed and position of conveyors and cranes according to the load or operation requirements. Electric drives can improve the productivity and safety of conveyors and cranes, as well as reduce wear and tear.
Machine tools and robots
Machine tools and robots are devices that perform various operations on materials or objects, such as cutting, drilling, welding, assembling, etc. Electric drives are used to control the speed and motion of machine tools and robots according to the task or program requirements. Electric drives can improve the accuracy and flexibility of machine tools and robots, as well as reduce downtime and maintenance.
Transportation applications
Transportation applications are those that use electric drives to power vehicles or systems that move people or goods from one place to another. Some examples of transportation applications are:
Electric vehicles
Electric vehicles are vehicles that use electric motors as their primary source of propulsion. Electric drives are used to control the speed and torque of electric motors according to the driver's input or road conditions. Electric drives can improve the performance and efficiency of electric vehicles, as well as reduce emissions and noise.
Trains and trams
Trains and trams are vehicles that run on rails or tracks. Electric drives are used to control the speed and traction of trains and trams according to the schedule or traffic conditions. Electric drives can improve the speed and reliability of trains and trams, as well as reduce energy consumption and pollution.
Elevators and escalators
the speed and position of elevators and escalators according to the demand or safety requirements. Electric drives can improve the comfort and convenience of elevators and escalators, as well as reduce space and cost.
Renewable energy applications
Renewable energy applications are those that use electric drives to harness energy from natural sources, such as wind, sun, or water. Some examples of renewable energy applications are:
Wind turbines
Wind turbines are devices that convert the kinetic energy of wind into electrical energy. Electric drives are used to control the speed and orientation of wind turbines according to the wind speed and direction. Electric drives can improve the power quality and stability of wind turbines, as well as reduce mechanical stress and noise.
Solar panels
Solar panels are devices that convert the radiant energy of sun into electrical energy. Electric drives are used to control the voltage and current of solar panels according to the solar irradiance and temperature. Electric drives can improve the efficiency and reliability of solar panels, as well as reduce losses and harmonics.
Battery storage systems
Battery storage systems are devices that store electrical energy in batteries for later use. Electric drives are used to control the charging and discharging of batteries according to the load or grid conditions. Electric drives can improve the performance and lifespan of batteries, as well as reduce cost and risk.
Rapidshare MAXSPEED Download Link
In this section, we will provide you with a link to download the book Electric Drives Concepts and Applications by Vedam Subrahmanyam from Rapidshare MAXSPEED, a fast and reliable file-sharing service. We will also explain how to download the book from Rapidshare MAXSPEED, as well as the benefits and drawbacks of using this service.
How to download the book from Rapidshare MAXSPEED?
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Extract the file using a software like WinRAR or 7-Zip.
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Conclusion
In this article, we have given you an overview of the book Electric Drives Concepts and Applications by Vedam Subrahmanyam, as well as a link to download it from Rapidshare MAXSPEED, a fast and reliable file-sharing service. We hope that you have found this article useful and informative, and that you will enjoy reading the book and learning more about electric drives. If you have any questions or comments, please feel free to contact us. Thank you for your attention and interest!
FAQs
Here are some frequently asked questions and answers about the book and the download link:
Q: Who is the target audience of the book?
A: The book is intended for undergraduate and graduate students, as well as engineers and researchers who are interested in learning more about electric drives.
Q: What are the prerequisites for reading the book?
A: The book assumes that the reader has some basic knowledge of electrical engineering, such as circuits, machines, power electronics, control systems, etc.
Q: What are the main features of the book?
A: The book covers the theory, design, analysis, and operation of various types of electric drives, with an emphasis on practical applications. The book also includes numerous examples, problems, case studies, and MATLAB codes to illustrate and reinforce the concepts.
Q: How can I access the MATLAB codes from the book?
A: The MATLAB codes from the book are available online at https://www.ee.iitm.ac.in/vedam/electric_drives/. You can download them for free and use them for your own purposes.
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