Explain the cylindrical or round rotors, Electrical Engineering

Assignment Help:

Explain the Cylindrical or Round Rotors?

All synchronous machines have a similar stator design and it is actually the rotor construction that makes them different. The rotor is also made of punched laminations that are stacked together for the same reasons as in the stator case. There are the two main types of rotor design. For high-speed operation, the 2-pole or 4-pole cylindrical or round rotors are commonly used with slots on their periphery to house the field windings (for 50-Hz supply, the respective speeds are 3000-rpm and 1500-rpm as indicated by the above expression). Figs.2 and 3 show the construction and winding arrangement of such rotors.

129_Explain the Cylindrical or Round Rotors 1.png

Figure: 4-pole round rotor with a field winding

2420_Explain the Cylindrical or Round Rotors 2.png

Figure: Finite Element (FE) models and structure of 8-pole diesel generator (left) and 2-pole turbo-generator (right)

For this machine type the air-gap is approximately constant (ignoring slotting effects). If operated as a generator, the prime mover is normally a steam or gas turbine rotating at 22000-rpm coupled through a speed reduction gearbox or, for smaller machines, a direct-coupled diesel engine. Due to high operating speeds and consequent relatively large centrifugal forces, there is normally a design limit imposed on the rotor diameter. Hence rotor length to diameter ratios of, say, 6:1 are typical for round rotors with the axis of rotation being always horizontal.

 

 

 


Related Discussions:- Explain the cylindrical or round rotors

Determine the cost of energy used in a system, The energy consumption for a...

The energy consumption for a small factory is given at the end of the brief. a) Three commercial tariffs from an energy supplier are shown below. Using these (or other commercia

Explain the delay model, Explain the delay model based on logical effort of...

Explain the delay model based on logical effort often used in estimating delays in logic cells. Hence use the model to predict the delay of a 4-input NOR logic cell with a 3 times

Nor gate - introduction to microprocessors , NOR Gate NOR means NOT OR ...

NOR Gate NOR means NOT OR . it complements the  output  of an OR  gate.  The symbol  of Nor  gate in fig. (a) shows that a Nor  gate  comprises  of an OR  gate followed  by a N

Prepayment meters, Prepayment Meters Usage of prepayment meters will e...

Prepayment Meters Usage of prepayment meters will extensively improve the revenue collection of the utilities. There are a number of ways in that prepayment assures revenue pr

Determine the advantages of e-nrz over nrz, 1. A modi?ed NRZ code known as ...

1. A modi?ed NRZ code known as enhanced-NRZ (E-NRZ) operates on 7-bit words; invert- ing bits 2,3,6 and 7; and adding one parity bit to each word. The parity bit is chosen to make

Describe the two core-excited states, Using the optimized 6-311G(d,p) geome...

Using the optimized 6-311G(d,p) geometry determined in question 1, perform the following equivalent core calculations for any two inequivalent carbons of butadiene: (a) Equivale

Effective negative voltage, Effective negative voltage: Effect negati...

Effective negative voltage: Effect negative voltage of get, when depend upon Pitch of voltage: the level of that results in id =0 ma is defined by eggs =vp with vp

Capacitive var, how over compensation by capacitive var rises voltage in a ...

how over compensation by capacitive var rises voltage in a circuit?

Can you explain about slew rate, Q. Can you explain about Slew Rate? Sl...

Q. Can you explain about Slew Rate? Slew (or slewing) rate is a measure of how fast the output voltage can change. It is given by the maximum value of dvo/dt , which is normall

Jfet ampli?er circuit, Q. For the CS JFET ampli?er circuit of Figure, R D ...

Q. For the CS JFET ampli?er circuit of Figure, R D = 2k and R L = 3k. The JFET with ro = 15 k has a voltage gain A v1 =-4.5 when the entire source resistance is bypassed. Fin

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd