What Is a Three-Phase Induction Motor and Why Should Every Electrical Engineer Know It.docx

1. What Is a Three-Phase Induction Motor and Why Should Every Electrical Engineer Know It? The Three-Phase Induction Motor is one of the most widely used electrical machines in industries due to its simple construction, ruggedness, low cost, and ease of maintenance. Whether you're preparing for GATE, semester exams, or brushing up for practical applications, understanding this machine is essential for any Electrical or Electronics Engineering student. ?Quick Visual Learning: Check out this concept explained visually in under 10 minutes: Working Principle of Three-Phase Induction Motor | Electrical & Electronics Engineering ⚙ ⚙️ What Is a Three-Phase Induction Motor? A Three-Phase Induction Motor operates on the principle of electromagnetic induction, where a rotating magnetic field is created by a three-phase AC supply in the stator, inducing current in the rotor, which in turn causes it to rotate. ? ? Key Points to Remember: Two Main Parts: ?Stator– the stationary part that produces a rotating magnetic field. ?Rotor– the rotating part where current is induced. Types of Rotor: ?Squirrel Cage Rotor?Slip Ring Rotor Working Principle: Based Electromagnetic Induction and Lenz’s Law. Advantages: ✔️ Low cost ✔️ High reliability ✔️ Minimal maintenance ✔️ Widely used in fans, pumps, compressors, and conveyors ? ? Numerical Example – Slip Calculation Question: A 3-phase, 4-pole, 50 Hz induction motor is operating at a speed of 1440 rpm. Calculate the slip of the motor. Solution:Synchronous Speed (Ns) = 120 × f / P = 120 × 50 / 4 = 1500 rpm Slip (S) = (Ns – Nr) / Ns × 100 = (1500 – 1440) / 1500 × 100 = 60 / 1500 × 100 = 4%   on Faraday’s Law of  

2. ✅Answer: The motor has a 4% slip ? ? Learn with Magic Marks – Your Visual Learning Partner If you’re a B.Tech or GATE aspirant looking to strengthen your core Electrical Engineering concepts, Magic Marks offers high-quality video lectures for Engineering students that simplify complex theories using animations, practical examples, and exam-focused explanations. With topics like: Transformers Synchronous Machines Circuit Theory Control Systems Power Electronics and more... You can learn faster, revise smarter, and score higher. ? ? Want to Dive Deeper into Electrical and Electronics Engineering? Visit ?magicmarks.in Explore a wide range of Electrical and Electronics Engineering video lectures created by expert faculty to support your academic and competitive exam success.     