Why Arw Generators Poles Laminated

Two generators a and b have 6 poles each.

Why arw generators poles laminated.

1 the stator windings and 2 the stator core. Does series generator has any residual magnetism s. 1 c 3. What is the use of back emf.

Where the fleming s left hand rule and right hand. With laminated armature eddy current losses are reduced to very less. Now a conductor that passes through a moving. The voltage drop for which of the following types of brush can be expected to be least.

Eddy current losses are the circular losses which occurs due to rotation of the armature. The individual iron pieces that make up the armature are referred to as laminations. A graphite brushes. As the stator rotates it generates an electromagnetic field that flows from north pole to south pole similar to the spin of the earth.

These individual thin pieces have a higher resistance than one solid piece and therefore produce less eddy currents and experience lower eddy current loss. Usually the rotor has windings that become a electromagnet. That is why armature of dc machines either motor or generator is laminated. This is why armature cores are made up of many thin pieces of iron rather than a large solid piece.

The rotor rotates the stator are the windings surrounding the rotor. Each of the three coils generates an ac voltage sine wave as illustrated in figure 4a and 4b. This action charges the engine s battery. Why back emf genrate.

What do you mean by single re entrancy and double. Therefore smaller the current hence lesser eddy current loss. In generators and alternators the rotor designs are salient pole or cylindrical. The squirrel cage rotor consists of laminated steel in the core with evenly spaced bars of copper or aluminum placed axially around the periphery permanently shorted at the ends by the end rings.

Illustrates a simplified threephase two pole ac generator. The voltage wave phase b begins one third of the way into the a wave cycle and the c wave. If we doesn t laminated the coils huge power losses will occur and large amount of heat. Generator a has wave wound armature while generator b has lap wound armature.

Note thinner the laminations greater is the resistance offered to induced e m f. The ratio of the induced e m f. But if you ve ever taken out a flywheel you d notice the stator core isn t a piece of solid metal. 3 b 3.

A turbogenerator stator is comprised of two major components. 2 d 1. The poles of the generator are the magnetic poles that induce a voltage. The stator core is made up of thousands tens of thousands or hundreds of thousands.

Lamination of a dc generator coils reduces the eddy current losses. Why current dose not increase in shunt generator a.