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1631 results in Energy Technology

Page 47 of 82

  • 2 - MATLAB Simulation of Power Semiconductor Devices

  • L. Ashok Kumar, A. Kalaiarasi, Y. Uma Maheswari
  • Book:
    Power Electronics with MATLAB
    Published online:
    19 August 2025
    Print publication:
    04 October 2017, pp 60-145

  • Summary

    A semiconductor is a robust device whose electrical conductivity is controlled over a wide range for superior or dynamic control. Semiconductor devices are electronic components that, like insulators, exploit the electronic properties of semiconductor resources, principally silicon, germanium, and gallium arsenide, as well as natural semiconductors. Semiconductors are financially and commercially attractive; these solid state devices have replaced vacuum tubes in most applications.

    Semiconductors are remarkable in their innovation and financial viability and financially. Semiconductors are the crucial materials for many electrical devices, from machines to cell phones to advanced sound players. When the circuit is not connected, pure semiconductors and insulators have generally comparable electrical properties.

  • 1 - Electro Magnetic Circuits

  • S. K. Sahdev
  • Book:
    Electrical Machines
    Published online:
    03 August 2019
    Print publication:
    04 October 2017, pp 1-78

  • Summary

    Introduction

    It is always advantageous to utilise electrical energy since it is cheaper, can be easily transmitted, easy to control and more efficient. The electrical energy is generally generated from natural resources such as water, coal, diesel, wind, atomic energy, etc. From these sources, first mechanical energy is produced by one way or the other and then that mechanical energy is converted into electrical energy by suitable machines. For the utilisation of electrical energy, it is again converted into other forms of energy such as mechanical, heat, light etc. It is a well-known fact that the electric drives have been universally adopted by the industry due to their inherent advantages. The energy conversion devices are always required at both ends of a typical electrical system. The devices or machines which convert mechanical energy into electrical energy and vice-versa are called electro–mechanical energy conversion devices.

    The operation of all the electrical machines such as DC machines, transformers, synchronous machines, induction motors, etc., rely upon their magnetic circuits. The closed path followed by the magnetic lines of force is called a magnetic circuit. The operation of all the electrical devices (e.g., transformers, generators, motors, etc.) depends upon the magnetism produced by their magnetic circuits. Therefore, to obtain the required characteristics of these devices, their magnetic circuits have to be designed carefully.

    In this chapter, we shall focus our attention on the basic fundamentals of magnetic circuits and their applications as electromechanical energy conversion devices.

    Magnetic Field and its Significance

    The region around a magnet where its poles exhibit a force of attraction or repulsion is called magnetic field.

    The existence of the magnetic field at a point around the magnet can also be determined by placing a magnetic needle at that point as shown in Fig. 1.1. Although magnetic lines of force have no real existence and are purely imaginary, yet their concept is very useful to understand various magnetic effects. It is assumed (because of their effects) that the magnetic lines of force possess the following important properties:

  • (i) The direction of magnetic lines of force is from N-pole to the S-pole outside the magnet. But inside the magnet their direction is from S-pole to N-pole.

  • (ii) They form a closed loop.

  • (iii) Their tendency is to follow the least reluctance path.

  • (iv) They act like stretched cords, always trying to shorten themselves.

  • 6 - Controllers Using MATLAB (AC–AC Converters)

  • L. Ashok Kumar, A. Kalaiarasi, Y. Uma Maheswari
  • Book:
    Power Electronics with MATLAB
    Published online:
    19 August 2025
    Print publication:
    04 October 2017, pp 290-338

  • Summary

    The voltage controller, also called an AC voltage controller or AC regulator, is an electronic module with either thyristors, triode alternating currents (TRIACs), silicon controlled rectifiers (SCRs), or insulated gate bipolar transistors (IGBTs). The module changes a constant voltage, to get a variable output voltage conveyed to the load. AC controllers are basically employed to change the root mean square (rms) value of the changing voltage, which is connected to the load terminal of the circuit, by making thyristors lead in between the AC supply source and the load terminal. Fluctuating voltage is used for diminishing road lights, fluctuations, warming temperatures in homes or industry, regulation and control of fans and winding machines, and numerous other applications, in a similar manner to an autotransformer. Voltage controller modules are power devices. Since they need less maintenance and are extremely productive, voltage controllers have, to a great extent, supplanted such modules as enhancers and saturable reactors.

  • 7 - Simulation and Digit al Control Using MATLAB

  • L. Ashok Kumar, A. Kalaiarasi, Y. Uma Maheswari
  • Book:
    Power Electronics with MATLAB
    Published online:
    19 August 2025
    Print publication:
    04 October 2017, pp 339-371

  • Summary

    The traditional methods of analysis may not be useful in the practical analysis of sensors. Traditional calculations may also not be satisfactory to simulate real life situation. Fuzzylogic-based systems may be used to overcome traditional calculation issues. Fuzzy logic liberates us from the rigid thinking of ideal arrangements of components that are utilized as part of typical systems. Fuzzy logic models guarantee a limited subjective analysis of a quantitative element system while being pertinent to any system that can be portrayed in technical terms. Fuzzy models give a compact and dynamic representation of systems that do not have a complete quantitative model or of indeterminate systems. Static thinking is not encouraged in fuzzy semantic representation of a quantitative system.

  • 8 - Power Electronics Applications

  • L. Ashok Kumar, A. Kalaiarasi, Y. Uma Maheswari
  • Book:
    Power Electronics with MATLAB
    Published online:
    19 August 2025
    Print publication:
    04 October 2017, pp 372-387

  • Summary

    Power devices transform and control electrical energy at high productivity using exchanging mode power semiconductor devices. Some regular uses of power devices include DC- and AC-directed power supplies, uninterruptible power supply (UPS) systems, electrochemical procedures, heating and lighting control, power line static VAR, and resonant compensation, high-voltage, direct current (HVDC) systems, photo voltaic and energy unit converter systems, solid state circuit breakers, high-frequency heating, variable speed engine drives and so forth. Engine drive zones might include applications in PCs and peripherals, solid state starters, home apparatuses, paper and material factories, wind generation systems, aerating, cooling and heating pumps, rolling and concrete plants, machine devices and mechanical autonomy, pumps and compressors, ship impetus and so forth. It is no big surprise that the use of power devices is presently spreading quickly from the developed countries to the developing nations of the world.

  • Preface

  • S. K. Sahdev
  • Book:
    Electrical Machines
    Published online:
    03 August 2019
    Print publication:
    04 October 2017, pp xxi-xxii

  • Summary

    This book on ‘Electrical Machines’ has been written for under-graduate students of Electrical Engineering (EE) and Electrical & Electronics Engineering (EEE) belonging to various Indian and Foreign Universities. It will also be useful to candidates appearing for AMIE, IETE, GATE, UPSC Engineering Services and Civil Services Entrance Examinations.

    We know that electrical energy has a wide range of applications where electrical machines play a vital role in industrial production and many other areas of science and technology. Accordingly, this book has been designed so that it be useful not only to students pursuing courses in electrical engineering but also for practising engineers and technicians.

    ‘Electrical Machines’ is taught at various universities under different titles such as Electrical Machines-I, Electrical Machines-II, DC Machines and Transformers, Electromagnetic Energy Conversion Devices, Special Purpose Machines, etc. All the topics in such courses have been covered in this single unit. As such, the book covers the revised syllabi of all Indian and Foreign Universities.

    Generally, students find Electrical Machines to be one of the most difficult subjects to understand, despite the availability of a large number of text books in this field. Keeping this fact in mind, this text has been developed in a systematic manner giving more emphasis on basic concepts.

    Each chapter of the book contains much needed text, supported by neat and self-explanatory diagrams to make the subject self-speaking to a great extent. A large number of solved and unsolved examples have been added in various chapters to enable students to attempt different types of questions in examination without any difficulty. Section Practice Problems have been added in all the chapters to maintain regular study and understanding. At the end of each chapter sufficient objective type questions, short-answer questions, test questions and unsolved examples have been added to make the book a complete and comprehensive unit in all respects.

    The author lays no claim to original research in preparing the text. Materials available in the research work of eminent authors have been used liberally. But the author claims that he has organised the subject matter in very systematic manner. He also claims that the language of the text is lucid, direct and easy to understand.

Page 47 of 82