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)
Synchronous Motor: Excitation, Current & Power Factor Explained A synchronous motor is an AC electric motor where the rotor's speed is precisely synchronized with the frequency of the AC supply. Unlike induction motors, it receives separate DC excitation for its rotor, creating a constant magnetic field. This unique feature allows control over its power factor (PF). Effect of Excitation on Current & PF: Under-excited: When DC excitation is reduced, the motor draws a lagging current from the supply, acting like an inductive load. The armature current increases. Normally-excited (Unity PF): At a specific excitation level, the motor draws minimum armature current and operates at unity power factor, meaning current and voltage are in phase. This is the most efficient operating point. Over-excited: Increasing DC excitation beyond the normal level causes the motor to draw a leading current, behaving like a capacitive load. The armature current increases again. This relationship is famously illustrated by the "V-curves" of a synchronous motor, showing how armature current varies with field excitation for different load conditions, with the lowest point of each "V" representing unity power factor. Synchronous motors are often used for power factor correction in industrial settings due to their ability to supply reactive power (when over-excited) to the system. Important Search Queries: synchronous motor working principle synchronous motor V curves power factor correction using synchronous motor under excited synchronous motor over excited synchronous motor synchronous condenser advantages of synchronous motor applications of synchronous motor difference between synchronous and induction motor synchronous motor starting methods #SynchronousMotor #PowerFactorCorrection #ElectricalMachines #ExcitationControl #UnityPowerFactor #LeadingPF #LaggingPF #VCurves #ElectricalEngineering #MotorControl --- 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