Why Arw Generators Poles Laminated

Two generators a and b have 6 poles each.

Why arw generators poles laminated.

In generators and alternators the rotor designs are salient pole or cylindrical. What do you mean by single re entrancy and double. But if you ve ever taken out a flywheel you d notice the stator core isn t a piece of solid metal. Therefore smaller the current hence lesser eddy current loss.

Eddy current losses are the circular losses which occurs due to rotation of the armature. The stator core is made up of thousands tens of thousands or hundreds of thousands. Does series generator has any residual magnetism s. Note thinner the laminations greater is the resistance offered to induced e m f.

A graphite brushes. That is why armature of dc machines either motor or generator is laminated. What is the use of back emf. 3 b 3.

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. The poles of the generator are the magnetic poles that induce a voltage. Each of the three coils generates an ac voltage sine wave as illustrated in figure 4a and 4b. The individual iron pieces that make up the armature are referred to as laminations.

As the stator rotates it generates an electromagnetic field that flows from north pole to south pole similar to the spin of the earth. Generator a has wave wound armature while generator b has lap wound armature. Usually the rotor has windings that become a electromagnet. Where the fleming s left hand rule and right hand.

Is generator a and b will be a 2. This is why armature cores are made up of many thin pieces of iron rather than a large solid piece. Instead it s segmented into hundreds of laminations. 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. Now a conductor that passes through a moving. With laminated armature eddy current losses are reduced to very less. The ratio of the induced e m f.

Illustrates a simplified threephase two pole ac generator. Can series generator be turned on off load similar. Lamination of a dc generator coils reduces the eddy current losses. A turbogenerator stator is comprised of two major components.

1 c 3. If we doesn t laminated the coils huge power losses will occur and large amount of heat. 1 the stator windings and 2 the stator core. This action charges the engine s battery.

Why back emf genrate. These individual thin pieces have a higher resistance than one solid piece and therefore produce less eddy currents and experience lower eddy current loss.