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: Effect of Increased Load with Constant Excitation When a synchronous motor operates with increased mechanical load while maintaining constant excitation (DC field current), here's what happens: The motor's fundamental characteristic is its constant speed operation (synchronous speed, $N_s = 120f/P$, where $f$ is frequency and $P$ is poles), regardless of load variations. To meet the increased load demand, the rotor *momentarily* slows down, causing it to fall back in phase relative to the rotating magnetic field of the stator. This angular displacement is known as the torque angle ($\delta$), and it increases with load. The increase in torque angle leads to a larger resultant voltage ($E_r$) in the stator winding, which in turn causes the armature current ($I_a$) to increase. This increased armature current draws more power from the supply to counteract the increased mechanical load and develop the necessary torque. The power factor (PF) of the motor tends to become more lagging under constant excitation as the load increases. Essentially, the synchronous motor adjusts its internal parameters (primarily torque angle and armature current) to produce the required output torque while rigidly maintaining its synchronous speed. If the load exceeds the motor's pull-out torque, it will lose synchronism and stall. Important Search Queries: synchronous motor load characteristics, constant excitation synchronous motor performance, torque angle synchronous motor, effect of load on synchronous motor, synchronous motor power factor control, synchronous motor V-curves. #SynchronousMotor #ElectricalMachines #PowerSystems #MotorControl #ConstantSpeed #TorqueAngle #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