Why Arw Generators Poles Laminated

Why back emf genrate.

Why arw generators poles laminated.

The individual iron pieces that make up the armature are referred to as laminations. Usually the rotor has windings that become a electromagnet. That is why armature of dc machines either motor or generator is laminated. With laminated armature eddy current losses are reduced to very less.

In generators and alternators the rotor designs are salient pole or cylindrical. Instead it s segmented into hundreds of laminations. Eddy current losses are the circular losses which occurs due to rotation of the armature. The voltage wave phase b begins one third of the way into the a wave cycle and the c wave.

Each of the three coils generates an ac voltage sine wave as illustrated in figure 4a and 4b. 3 b 3. Does series generator has any residual magnetism s. A turbogenerator stator is comprised of two major components.

Can series generator be turned on off load similar. Is generator a and b will be a 2. This action charges the engine s battery. Now a conductor that passes through a moving.

This is why armature cores are made up of many thin pieces of iron rather than a large solid piece. If we doesn t laminated the coils huge power losses will occur and large amount of heat. The poles of the generator are the magnetic poles that induce a voltage. Illustrates a simplified threephase two pole ac generator.

Why current dose not increase in shunt generator a. As the stator rotates it generates an electromagnetic field that flows from north pole to south pole similar to the spin of the earth. Note thinner the laminations greater is the resistance offered to induced e m f. 1 c 3.

But if you ve ever taken out a flywheel you d notice the stator core isn t a piece of solid metal. Two generators a and b have 6 poles each. A graphite brushes. What do you mean by single re entrancy and double.

Lamination of a dc generator coils reduces the eddy current losses. These individual thin pieces have a higher resistance than one solid piece and therefore produce less eddy currents and experience lower eddy current loss. Therefore smaller the current hence lesser eddy current loss. The stator core is made up of thousands tens of thousands or hundreds of thousands.

The voltage drop for which of the following types of brush can be expected to be least. The rotor rotates the stator are the windings surrounding the rotor. 1 the stator windings and 2 the stator core. What is the use of back emf.

2 d 1. Generator a has wave wound armature while generator b has lap wound armature.