Why Arw Generators Poles Laminated

Note thinner the laminations greater is the resistance offered to induced e m f.

Why arw generators poles laminated.

Therefore smaller the current hence lesser eddy current loss. Generator a has wave wound armature while generator b has lap wound armature. With laminated armature eddy current losses are reduced to very less. A turbogenerator stator is comprised of two major components.

Now a conductor that passes through a moving. That is why armature of dc machines either motor or generator is laminated. These individual thin pieces have a higher resistance than one solid piece and therefore produce less eddy currents and experience lower eddy current loss. The poles of the generator are the magnetic poles that induce a voltage.

This is why armature cores are made up of many thin pieces of iron rather than a large solid piece. The ratio of the induced e m f. The stator core is made up of thousands tens of thousands or hundreds of thousands. 2 d 1.

What is the use of back emf. What do you mean by single re entrancy and double. A graphite brushes. Two generators a and b have 6 poles each.

Illustrates a simplified threephase two pole ac generator. Eddy current losses are the circular losses which occurs due to rotation of the armature. Why back emf genrate. Usually the rotor has windings that become a electromagnet.

The rotor rotates the stator are the windings surrounding the rotor. As the stator rotates it generates an electromagnetic field that flows from north pole to south pole similar to the spin of the earth. Does series generator has any residual magnetism s. The voltage drop for which of the following types of brush can be expected to be least.

This action charges the engine s battery. Where the fleming s left hand rule and right hand. Each of the three coils generates an ac voltage sine wave as illustrated in figure 4a and 4b. 1 the stator windings and 2 the stator core.

The voltage wave phase b begins one third of the way into the a wave cycle and the c wave. 3 b 3. If we doesn t laminated the coils huge power losses will occur and large amount of heat. Instead it s segmented into hundreds of laminations.

Lamination of a dc generator coils reduces the eddy current losses. Is generator a and b will be a 2. 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. 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. The individual iron pieces that make up the armature are referred to as laminations.