Electrical Machines

## Efficiency of DC Generator & Condition for Maximum Efficiency

The power flow input to output is known as power stages or power flow diagram Efficiency :      It may be defined as the ratio of output in watt ( or KW ) to the input in watt ( or KW ). Mechanical efficiency, E…

## Parallel Operation of DC Generator - Conditions & Advantages

Conditions for Parallel Operation of Dc Generator :       To connects the generators in parallel to common bus-bars, the generators should satisfy the following conditions. The incoming generator's voltage should be…

## Lap and Wave Winding

Lap Winding :      When the winding is connected in such a manner that the end of the one coil is connected to the starting end of other coils ( adjacent coil ) of the same pole and so on then the winding is known as lap wi…

## Methods of Improving Commutation in DC Generator

There are two methods of improving commutation i.e. of making current reversal in the short-circuited coil as spark-less as possible. They are : Resistance commutation. EMF commutation ( it is done with the help of brush…

## Types of DC Generators - Shunt, Series & Compound

Based on the methods of the interconnection of windings the following types of dc generators are available. (i). Separately-excited dc generator (ii). Self-excited dc Generators with      (a) Shunt-field connection,     …

## E.M.F Equation of DC Generator

We know that the working principle of dc generator, that when conductors begin to cut the magnetic lines of force and therefore, the e.m.f. induces in the conductors according to the Faraday's Law of Electromagnetic …

## Working Principle of a DC Generator

Working Principle of DC Generator :      A simple coil of wire ABCD is mounted on a shaft between two magnetic poles. The two ends of the coil are connected to two slip rings, S 1 , S 2 which are mounted on the same sha…

## Losses in Induction motor

The losses in an induction motor can be classified as Constant losses. and, Variable losses Constant Losses :      Constant losses are those which doesn't affect due to variation in load conditions on the motor. The…

## Types of Single Phase Induction Motors

Types of Single Phase Induction Motors :      Single-phase induction motors are not self-starting because there is no rotating magnetic field produced. It is not practicable to provide initial rotation to the rotor, manual…