When a single-phase induction motor is supplied from a source, the flux produced will be alternating in nature. Due to transformer action, an e.m.f is induced in the stationary rotor bars and the flux produced will also be alternating. As the stator flux and the rotor flux have the same magnetic axis, they lack to […]
Working Principle of Single Phase Induction Motor Read More »
The ratio of the phasor sum of E.M.Fs induced in all the coils distributed in a number of slots under one pole to the arithmetic sum of the E.M.Fs induced is known as distribution factor (Kd). It is also known as breadth factor (Kb).
What is Distribution Factor? Definition, Derivation & Formula Read More »
Figure 1: Power Flow Diagram of Induction Motor.
Power Flow Diagram of Induction Motor Read More »
Figure 1: Losses in Induction Motor.
Losses and Efficiency of Induction Motor Read More »
If the voltage applied to the induction motor contains harmonics, then the harmonic fluxes are developed in the gap due to the magnetics of the motor. These harmonic fluxes induce e.m.f and circulate harmonic currents in the rotor windings.
Crawling and Cogging in Induction Motor Read More »
Figure 1: Star-Star or (Y-Y) Connection. Fig. 1 shows a star-star connection of primary and secondary windings.
What is Star-Star or (Y-Y) Connection of Three Phase Transformer? Read More »
When a DC generator is loaded, the current flows through the armature winding, commutator and brushes to the external circuit. During this process, whenever a brush spans the two commutator segments, the winding element connected to those commutator segments is short-circuited. The changes in current direction, which take place in the winding part, just before,
Commutation in DC Machine (Generator or Motor) – Process & Remedies Read More »
A DC generator is the most commonly used separately excited generator, used for electroplating and battery charging. A separately excited generator is one in which the magnetic field is excited from an external DC source. The DC source may be a DC generator or a battery or a metal rectifier connected to an AC supply.
What is Separately Excited DC Generator? Circuit diagram, Characteristics & Advantages Read More »
The armature control method works on the principle that the speed of the DC motor could be varied by varying the back emf. Fig. 1: Armature Control Method of DC Motor.
What is Armature Control Method of DC Motor? Working Principle, Diagram & Applications Read More »
A constant voltage transformer (CVT) works on ferro-resonant principle. The variation in the primary flux with an unsaturated iron core does not affect the secondary flux with saturated iron core. Thus, the secondary induced voltage remains relatively independent of the voltage impressed upon the primary winding. Fig. 1: Constant Voltage Transformer (CVT).
What is Constant Voltage Transformer (CVT)? Working Principle, Diagram & Applications Read More »