Complete Electrical Machines course for B.Tech EEE and GATE in 80+ video lectures: magnetic circuits, DC machines, single-phase and three-phase transformers, induction motors, alternators and synchronous motors. Watch in order: each lecture builds on the previous one. Modules: 1. Magnetic Circuits & Electromagnetic Induction (Lectures 1A-1R) 2. DC Machines: construction, windings, EMF equation, armature reaction, losses (2A-2J) 3. DC Motors: torque, characteristics, speed control (3A-3C) 4. Single-Phase Transformers: EMF equation, equivalent circuit, OC/SC tests, regulation, efficiency (4A-4H) 5. Three-Phase Transformers: winding connections, vector groups, Scott connection (5A-5D) 6. Three-Phase Induction Motors: rotating magnetic field, torque-slip, equivalent circuit, starting (6A-6K) 8. Alternators (Synchronous Generators): EMF equation, armature reaction, voltage regulation, two-reaction theory (8A-8J) 9. Synchronous Motors: starting, effect of excitation, synchronous condenser, applications (9A-9J) 10. Single-Phase Induction Motors: double revolving field, types, equivalent circuit (10A-10E) Solved problems for every module (Electrical Machines Tutorials): https://www.youtube.com/playlist?list=PL5TKV1tzb09kPh9xyaU8yZC4ph305bTty Notes & more: https://engineeringdevotion.com #ElectricalMachines #ElectricalEngineering #GATEEE
Curated by: Engineering Devotion (81 videos)
Three-Phase Induction Motors: The Rotating Magnetic Field Explained Three-phase induction motors are the workhorses of industry, primarily due to their robust construction, efficiency, and self-starting capability. This self-starting nature is fundamentally attributed to the rotating magnetic field (RMF) generated within their stator. When a balanced three-phase AC supply is applied to the stator windings of an induction motor, which are physically displaced by $120^\circ$ from each other, each phase current produces a pulsating magnetic field. The clever arrangement and phase difference ($120^\circ$ electrical) of these currents result in a resultant magnetic field that rotates at a constant speed, known as the synchronous speed ($N_s = 120f/P$). This constantly rotating magnetic field "cuts" the conductors in the squirrel cage or wound rotor, inducing an electromotive force (EMF) and subsequent current (by Faraday's Law of Induction). According to Lenz's Law, the induced current creates its own magnetic field that interacts with the stator's RMF, producing a torque that drives the rotor in the same direction as the RMF. The rotor always runs at a speed slightly less than the synchronous speed, a difference known as "slip," which is essential for induction to occur. Important search queries in this topic: how rotating magnetic field is produced in 3 phase induction motor, rotating magnetic field principle, synchronous speed calculation induction motor, working principle of three phase induction motor, three phase induction motor construction, slip in induction motor, applications of three phase induction motor, why induction motor is self starting, stator winding three phase motor, electromagnetic induction in motors #ThreePhaseInductionMotor #RotatingMagneticField #RMF #InductionMotor #ElectricalMachines #MotorPrinciple #SynchronousSpeed #ElectricalEngineering --- Electrical Machines full course (lectures): https://www.youtube.com/playlist?list=PL5TKV1tzb09lbVthPhckKZ7JsnwHkWmFP Electrical Machines solved problems (tutorials): https://www.youtube.com/playlist?list=PL5TKV1tzb09kPh9xyaU8yZC4ph305bTty Notes & more: https://engineeringdevotion.com