Contents
- Overview of electrical concepts
- Introduction
- Analysis-Circuit Analysis-Three-phase circuit analysis
- Summary of Power and Power
- View questions
- Questions
- Overview of the basic laws of electromagnetism
- Introduction
- Maxwell’s equation
- Magnetic tools and their advantages
- Self-defense and freedom from power
- Magnetic loss
- Stationary machines
- Summary
- View questions
- Introduction
- Electric fire as a tool
- Gravity as the middle ground
- Coin in a single magnetic field
- Money changing magnetic field engine over time
- Rejection engine
- Electricity
- Summary
- View questions
- Questions
- Converters
- Introduction
- Building a transformer
- Positive change
- Special changes
- Voltage regulation
- Maximum efficiency
- Define Transformer parameters for each calculation
- Autotransformer
- Three-phase inverters
- Constant current variables
- Replace equipment
- Summary
- View questions
- Questions
- Direct current
- Introduction
- Construction machinery
- Replace anchor
- EMF balancing
- Improved torque
- Using the magnetizing properties of DC machines for reduction
- Inappropriate behavior
- DC generator type
- Voltage regulation
- Losses in DC machines
- DC generators are wound differently
- Electric generator
- Electric series
- Electricity
- Maximum efficiency
- Summary
- View questions
- Questions
Preface
Electrical Machines and Transformers is written for junior/senior level students studying various types of electrical machines. Based on years of teaching experience, the book has been developed to provide maximum flexibility without losing continuity from one subject to another. We believe that this method will help the instructor easily adapt the material to the requirements of the electrical engineering course. We recommend that institutions that follow the semester system and offer only one electrical engineering course focus more on core subjects and plan time for advanced subjects. The Manual focuses on the essential functions of each machine and limits the unnecessary ones. The material presented in each chapter progresses from established principles to advanced topics. In the second book, we included many evaluation questions at the end of each chapter. Since the addition of test questions was highly appreciated by the students, we continued this in the third edition. Based on the feedback we received from students, other teachers, and reviewers, we have added many new materials to correct inaccuracies or further clarify concepts. We have also adapted some examples from the text to complement the development of the principles that precede each example. We also repeat an exercise at the end of each chapter. As we said in the second book, the purpose of this exercise is to build confidence and increase knowledge about the topics presented in each chapter. We also revised the questions at the end of each chapter and arranged them so that students could ask more questions. These questions should be viewed as an important part of the learning process and the student should use deep thinking to solve them. Some problems in the text require nonlinear problem solving, and we recommend that the student be encouraged to solve these problems using a software package such as Mathcad®. We used Mathcad® to solve almost all of the examples in this book. We encourage the use of the software because it reduces the difficulty of everyday calculations, allows the student to explore the machine in depth and helps the student focus on the ‘how to’ type ofproblems. Our basic philosophy has not changed while writing the third edition. We heard then, and we hear now, that taking a course in the language of things only leads to memorizing metaphors that are quickly forgotten. To motivate the student, we must present the material in a systematic way. In other words, our goals when teaching electrical engineering
• To explain the construction of mechanical structures,
• Put a light on the line and place it,
• Explain the basic rules that regulate its operation,
• Validate ideas that are important to develop related ideas and
• Emphasize its boundaries. If the student understands the machine well, we should too. Developing the necessary examples using basic probability rules. Each comparison must be placed in the correct order to match the performance of the machine. When the principles of mechanical operation are properly explained and relevant examples are translated into basic rules, the student learns:
• Appreciates the development of principles,
• Also reduce terrorism
• Receive the power of thinking. The final result of such a lesson will be made by the student in the future. Feel free to solve the toughest problems with confidence. We did our best to embody this philosophy in the development of the document. Our experience shows that students tend to view the development of principles as a process of abstraction and reinforcement of some equations which then become ‘formulas’. Therefore, for students to appreciate the training, the teacher has the responsibility to show that the concept can be used to solve practical problems in different situations. To achieve this goal, the teacher needs to focus on their skills in this area and emphasize other subjects that are used regularly. This also requires strengthening any new developments in the region as priorities are discussed. For example, when explaining the magnetic force between two magnetic fields, the instructor should draw attention to the magnetic fields. In writing this article, we have assumed that the student has a strong background in differential equations, de and ac (single and three-phase) electrical network analysis, Laplace transforms and their applications, and knowledge of electronics. Chapters 1 and 2 are written to review basic concepts related to electrical circuits and electronic fields. Chapter 1 is expanded with a discussion of testing in first and third grades. The presentation of magnetic circuits in Chapter 2 is further developed so that the student can understand the effect of filling magnetic materials on machine performance. The nonlinear behavior of the magnetic material due to self-saturation is actually a blessing in disguise for the stable operation of the generator.
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