Shaded Pole Motor Working Principle: Figure 10.17 shows a typical Shaded Pole Motor with a squirrel-cage rotor. A small portion of each pole is covered with a short-circuited, single-turn copper coil called the shading coil.…
Series Parallel Control of DC Motor: Series Parallel Control of DC Motor - Here two identical motors are coupled together mechanically to a common load. Two speeds at constant torque are possible in this method…
Separately Excited DC Motor for Dynamic Analysis: Separately Excited DC Motor for Dynamic Analysis - The DC machines are quite versatile and are capable of giving a variety of V-A and speed-torque characteristics by suitable…
Self Excited DC Generator: Rather than arranging a separate dc source for excitation purposes, practical generators are always excited from their own armature terminals, this method of excitation being known as Self Excitation. A Self…
Rotating Magnetic Field: Rotating Magnetic Field - It was seen earlier that the sinusoidal current in any phase of an ac winding produces a pulsating mmf wave in space whose amplitude varies sinusoidally with time.…
Rotating Electrical Machines: We Know that electromechanical energy conversion takes place whenever a change in flux is associated with mechanical motion. Speed voltage is generated in a coil when there is relative movement between the…
Rheostatic Control Method: Rheostatic Control Method - Series armature-resistance control : Here the applied armature voltage is varied by placing an adjustable resistance Re in series with the armature as shown in Fig. 7.58 along…
Recent Trends in Power Semiconductors: The recent trends in Power Semiconductors from application point of view show that MOSFETs and IGBTs are replacing BJTs almost completely while GTOs are currently being used for high V…
Recent Trends in Electric Machines: Recent Trends in Electric Machines are neural networks, Artificial Intelligence, expert system, fibre communications and integrated electronics, hot superconductors and other new ceramic conducting and dielectric materials, magnetic levitation etc. should…
Real Transformer On Load Condition | Equivalent Circuit: Figure 3.11 shows a Real Transformer On Load Condition. Both the primary and secondary have finite resistances R1 and R2 which are uniformly spread throughout the winding;…
