Contents
- Overview of electrical concepts
- Introduction
- Analysis-Circuit Analysis-Three-phase Circuit Analysis
- Summary of Power and Power
- View questions
- Questions
- The basic laws of electromagnetism are outlined.
- 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 is the middle ground.
- Coin in a single magnetic field
- The magnetic field engine of money changes 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
- The magnetizing properties of DC machines are utilized 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
The book Electrical Machines and Transformers caters to junior/senior-level students who are studying various types of electrical machines. We have developed the book based on years of teaching experience to ensure maximum flexibility and maintain 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. Each chapter presents material that progresses from established principles to advanced topics. In the second book, we included many evaluation questions at the end of each chapter. The students highly appreciated the addition of test questions, so we continued this practice 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 one. 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. The chapter-end questions were revised and rearranged so students could ask more questions. Viewing these questions as an integral part of the learning process, students should apply deep thinking to solve them. We recommend encouraging the student to solve nonlinear problems in the text using a software package like 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 of problems. Our basic philosophy has not changed while writing the third edition. Both then and now, we have heard that pursuing a course in the language of things only results in the memorization of quickly forgotten metaphors. To motivate the student, we must present the material in a systematic way. In other words, what are our goals when teaching electrical engineering?
• To explain how mechanical structures are constructed,
• Place a light on the line.
• Explain the basic rules that regulate its operation.
• Validate important ideas to develop related ones.
• Emphasize its boundaries. If the student understands the machine well, we should too. We should create the required examples by applying fundamental probability principles. Place each comparison in the correct order to align with the machine’s performance. By properly explaining the principles of mechanical operation and translating relevant examples into basic rules, the student gains knowledge:
• Appreciates the development of principles,
• Also, reduce terrorism.
• Receive the power of thinking. The student will shape the final outcome of this lesson 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, it is the teacher’s responsibility to demonstrate how students can apply the concept to solve practical problems in various situations, enabling them to appreciate the training. In order to accomplish this goal, the teacher must concentrate on honing their skills in this area and highlighting other regularly used subjects. As we discuss priorities, we also need to reinforce any new developments in the region. 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. We have written Chapters 1 and 2 to review basic concepts related to electrical circuits and electronic fields. We expand Chapter 1 by discussing testing in first and third grades. Chapter 2 further develops the presentation of magnetic circuits, enabling the student to comprehend the impact of filling magnetic materials on machine performance. The self-saturation-induced nonlinear behavior of the magnetic material actually contributes to the stable operation of the generator.
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