Why Arw Generators Poles Laminated

A graphite brushes.

Why arw generators poles laminated.

Note thinner the laminations greater is the resistance offered to induced e m f. Does series generator has any residual magnetism s. The individual iron pieces that make up the armature are referred to as laminations. These individual thin pieces have a higher resistance than one solid piece and therefore produce less eddy currents and experience lower eddy current loss.

Eddy current losses are the circular losses which occurs due to rotation of the armature. But if you ve ever taken out a flywheel you d notice the stator core isn t a piece of solid metal. 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.

Why current dose not increase in shunt generator a. Now a conductor that passes through a moving. What do you mean by single re entrancy and double. With laminated armature eddy current losses are reduced to very less.

Lamination of a dc generator coils reduces the eddy current losses. This is why armature cores are made up of many thin pieces of iron rather than a large solid piece. Therefore smaller the current hence lesser eddy current loss. That is why armature of dc machines either motor or generator is laminated.

A turbogenerator stator is comprised of two major components. Is generator a and b will be a 2. The rotor rotates the stator are the windings surrounding the rotor. 2 d 1.

Two generators a and b have 6 poles each. As the stator rotates it generates an electromagnetic field that flows from north pole to south pole similar to the spin of the earth. Why back emf genrate. The voltage wave phase b begins one third of the way into the a wave cycle and the c wave.

The ratio of the induced e m f. 1 c 3. What is the use of back emf. This action charges the engine s battery.

Can series generator be turned on off load similar. The voltage drop for which of the following types of brush can be expected to be least. In generators and alternators the rotor designs are salient pole or cylindrical. If we doesn t laminated the coils huge power losses will occur and large amount of heat.

Usually the rotor has windings that become a electromagnet. Instead it s segmented into hundreds of laminations. The stator core is made up of thousands tens of thousands or hundreds of thousands. Generator a has wave wound armature while generator b has lap wound armature.

Each of the three coils generates an ac voltage sine wave as illustrated in figure 4a and 4b. 3 b 3.