Electrical Machines II Course | IIT Kharagpur | Induction & Synchronous Motors

Course Details

Master the Core Principles of Rotating Electrical Machines

Welcome to an in-depth exploration of Electrical Machines - II, a pivotal course designed for undergraduate engineering students. This 12-week program, meticulously crafted and delivered by Prof. Tapas Kumar Bhattacharya of IIT Kharagpur, delves into the fundamental principles and advanced applications of key rotating electrical machines. With over three decades of teaching experience, Prof. Bhattacharya brings unparalleled expertise, making complex concepts in electrical machines and special machines accessible and engaging.

About the Course

This course builds a strong foundation by first establishing the basic principles required for the steady production of electromagnetic torque and explaining motoring and generating modes of operation. The primary focus is on the detailed study of 3-phase induction machines, single-phase induction motors, and synchronous machines.

A clear understanding of distributed windings, rotating magnetic fields, and the nature of air-gap flux distribution is crucial, and dedicated lectures ensure you grasp these core concepts. The course emphasizes deriving equivalent circuits for each machine type, which are then used to develop torque expressions and analyze performance.

You will explore critical operational aspects such as starting methods, speed control techniques, and electrical braking. While the emphasis is on steady-state performance, the course also introduces important transient analyses, such as stability studies. A key objective is to develop your ability to solve numerical problems logically and efficiently.

Intended Audience & Prerequisites

• Intended Audience: This course is a core subject for UG Electrical Engineering students and serves as a valuable elective for UG Mechanical and Mining Engineering students.
• Prerequisites: A solid understanding of Basic Electrical Technology, including circuit analysis and the working principles and equivalent circuit representation of a transformer, is required.

Industry Relevance

The knowledge gained from this course is highly valued in the power and heavy electrical industry. Major organizations such as BHEL, CESC, NTPC, and WBPDCL recognize the importance of these fundamentals, making this course essential for aspiring engineers in the power sector.

Detailed Course Layout (12 Weeks)

Weeks 1-4: Foundations of Rotating Machines

• Week 1: Brief review of transformers. General construction of rotating machines. Conditions for steady electromagnetic torque production.
• Week 2: MMF and flux density distribution by single and multiple coils. Basic winding terms, balanced 3-phase windings, and electrical vs. mechanical angles.
• Week 3: Production of a rotating magnetic field by 3-phase windings—its speed, direction, and critical implications.
• Week 4: Deriving the expression for induced voltage in a moving coil—RMS value and frequency.

Weeks 5-8: Deep Dive into Induction Machines

• Week 5: Construction of 3-phase induction motors. Concept of slip. Developing the equivalent circuit and torque expression.
• Week 6: Torque-slip characteristics, operating point determination, and modification via rotor resistance, supply voltage, and frequency control.
• Week 7: Practical parameter estimation from no-load and blocked rotor tests. Problem-solving session.
• Week 8: Single-phase induction motors: Double revolving field theory, equivalent circuit, torque characteristics, and starting methods with auxiliary windings (including capacitor calculation).

Weeks 9-12: Synchronous Machines & System Stability

• Week 9: Synchronous machine types, construction, EMF equation, synchronous reactance. Synchronization, phasor diagrams, voltage regulation, excitation variation, and power-angle characteristics.
• Week 10: Synchronous motor operation: Phasor diagrams under various loads and the effect of excitation variation (V-curves).
• Week 11: Salient pole synchronous machines: Direct-axis and quadrature-axis reactances, phasor diagrams for motoring and generating modes.
• Week 12: Introduction to dynamics: The swing equation, equal area criterion, and steady-state vs. transient stability limits.

Recommended Textbooks

To supplement your learning, the following authoritative texts are highly recommended:

Why Enroll in This Course?

This course offers a unique blend of theoretical rigor and practical application, guided by an instructor from India's premier engineering institution. Whether you aim to excel in academia, crack competitive exams, or build a robust foundation for a career in the power industry, Electrical Machines - II provides the essential knowledge and analytical skills. Enroll today to unlock the principles that drive the world's electrical motors and generators.

Explore More