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)
Magnetic B-H Curve & Hysteresis: The Magnetic B-H Curve (or Magnetization Curve) and Hysteresis Loop are fundamental concepts in understanding how ferromagnetic materials respond to magnetic fields. What they are: B-H Curve: This is a graph that plots the Magnetic Flux Density (B) (strength of the magnetic field inside a material) against the Magnetic Field Strength (H) (external applied magnetic field). As H increases, B generally increases, but not linearly, especially in ferromagnetic materials. Hysteresis: This phenomenon describes the "lagging" of the magnetic flux density (B) behind the applied magnetic field strength (H). When a ferromagnetic material is magnetized and then the external field is removed, it retains some magnetism (retentivity). To fully demagnetize it, a reverse magnetic field (coercivity) must be applied. This "memory" effect results in the B-H curve forming a closed loop, known as the Hysteresis Loop, when the material undergoes a complete cycle of magnetization. Why they matter: Material Characterization: The shape and size of the hysteresis loop reveal crucial properties of magnetic materials, classifying them as "soft" (narrow loop, low loss, e.g., for transformers) or "hard" (wide loop, high retentivity and coercivity, e.g., for permanent magnets). Energy Loss (Hysteresis Loss): The area enclosed by the hysteresis loop represents the energy lost as heat during each magnetization cycle. Minimizing this loss is critical in applications like transformers and motors. Magnetic Memory: Hysteresis explains why certain materials can retain magnetism, a property essential for data storage (hard drives, magnetic tapes). Applications: Understanding B-H curves and hysteresis is vital for designing and selecting materials for various electrical and electronic devices, including transformers, inductors, electromagnets, and permanent magnets. Important Search Queries in this Topic: What is B-H curve? Magnetic hysteresis explained Hysteresis loop definition Retentivity and coercivity Applications of B-H curve Hysteresis loss in magnetic materials Soft vs. hard magnetic materials How to measure B-H curve Ferromagnetic materials properties Magnetization curve interpretation Magnetic saturation Residual magnetism B-H curve for transformer core Permanent magnet materials #BHCurve #MagneticHysteresis #Magnetism #Ferromagnetism #ElectricalEngineering #MaterialScience #Electromagnetics #MagneticProperties #HysteresisLoop #PhysicsOfMaterials --- 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