SALGI
Mar 19 32 Rotor of Synchronous Motor The rotor is the moving part of the machine Rotors are available in two types Salient Pole Type Cylindrical Rotor Type The salient pole type rotor consists of poles projecting out from the rotor surface It is made up The limiting factor for the size of the rotor is the centrifugal force acting on the rotating member of the machine As the mechanical strength of salient pole type is less this is preferred for low speed alternators ranging from 125 rpm to 50 rpmThe prime movers used to drive such rotor are generally water turbines and IC engin
立即联系/Live Chat
Mar 28 32 It is clear from the above expression that the power is a little more than that for a cylindrical rotor synchronous machine as the first term alone represents the power for a cylindrical rotor synchronous machine A term in sin 2δ is added into the power angle characteristic of a non salient pole synchronous machineMar 02 32 There are mainly two types of Synchronous Generator from rotor construction point of view The two main types of synchronous machine are Cylindrical Rotor and Salient Pole Saliency simply means projection outward Therefore from the literal meani
立即联系/Live Chat
PDF This article provides design and finite element analyses information of two possibilities of cylindrical rotor synchronous machine excitation winding designs It is focused especially on Dec 08 32 Lets us consider a doubly excited magnetic system as shown in figure below In this model of machine both stator as well as rotor is assumed to be salient pole type Let’s assume that stator is energized from source Vs whereas rotor is energized with source Vr Total torque developed in such doubly excited magnetic
立即联系/Live Chat
Cylindrical rotor The In a three phase induction machine alternating current supplied to the stator windings energizes it to create a rotating magnetic flux The flux generates a magnetic field in the air gap between the stator and the rotor and induces a voltage which produces current through the rotor barsmachines one has to understand some rudiments of electrical and mechanical engineering Chapter 1 is written for those who are involved in operating maintaining and trouble shooting electrical generators and who want to acquire a better under standing of the principles governing the machine
立即联系/Live Chat
A cross sectional sketch of a three phase cylindrical rotor synchronous machine is shown schematically in Fig 52 The figure shows a two pole machine alternatively this can be considered as two poles of a multipole machine The three phase armature winding on the stator is of the same type used in the discussion of rotating magnetic Jul 19 32 Difference between salient pole and non salient pole rotor used in synchronous generator synchronous machine can be characterized by the type of rotor used Since these rotors are cylindrical the windage loss is reduced The noise produced is also less These rotors
立即联系/Live Chat
Cylindrical pole high speed rotors are used in high speed gas and steam turbine generators which operate at 1 000rpm and above This rotor is used in applications where a distributed winding is required The rotor body is made from laminations with slots to take the windingsA cross sectional sketch of a three phase cylindrical rotor synchronous machine is shown schematically in Fig 52 The figure shows a two pole machine alternatively this can be considered as two poles of a multipole machine The three phase armature winding on the stator is of the same type used in the discussion of rotating magnetic
立即联系/Live Chat
The rotor of a synchronous machine is a large electromagnet The magnetic poles can be either salient sticking out of rotor surface or non salient construction Non salient pole rotor usually two and four pole rotors Salient pole rotor four and more pol Rotors are made laminated to Jun 08 32 2 Non salient pole or Cylindrical rotor or Round rotor Machines These machines are having cylindrical smooth rotor construction with distributed field winding in slots This type of rotor construction is employed for the machine driven by steam
立即联系/Live Chat
The first term of this expression is the same as the power in a cylindrical rotor machine and the second term is the additional power due to the reluctance torque in the machine Since the induced torque in the generator is given by the induced torque in the motor can be In the previous section an equation was developed that predicted the windage loss of a smooth cylindrical rotor However many machines are designed with salient poles so it is desirable to modify the equation allow it be used for machines of this type The problem will be approached here by empirical means since there is no known
立即联系/Live Chat
The limiting factor for the diameter of synchronous machine is the peripheral speed The limiting value of peripheral speed is 175 m/sec for cylindrical rotor machines and 80 m/sec for salient pole machin 7 Write the expression for air gap length in cylindrical rotor machine 8 Define short circuit ratio of a synchronous gemeratorThus salient pole rotors are well suited to low speed large dia machines and smooth cylindrical rotors for high speed small dia machin Good day 3 Recommendations 8th Aug
立即联系/Live Chat
From the perspective of a point on the rotor surface this field appears to rotate at twice synchronous speed As this field sweeps across the rotor it induces double frequency currents into the rotor body of a cylindrical rotor machine and in the pole face of a salient pole machineTorque in Round Rotor Machine Torque in Round Rotor Machine When the stator and rotor windings of a machine both carry currents they produce their own magnetic fields along their respective axes which are sinusoidally distributed along the air gap Torque results from the tendency of these two fields to align themselv
立即联系/Live Chat
Massachusetts Institute of Technology Department of Electrical Engineering and Computer Science Electric Machines Class Notes 4 Elementary Synchronous Machine Models c James L Kirtley Jr The ‘machine’ consists of a cylindrical rotor and a cylindrical statora salient pole machine such as Fig 1 the rotor is not cylindrical and the air gap length depends on the angle with respect to the rotor axis The expression for torque and power is more complex in a salient pole machine and the maximum torque typically occurs at a smaller value of δ
立即联系/Live Chat
Machines with cylindrical rotors are typically found in higher speed higher power applications such as turbogenerators Using 2 or 4 poles these machines rotate at or rpm with 60hz systems Remember that machine power is a function of the size of the machineThe limiting factor for the diameter of synchronous machine is the peripheral speed The limiting value of peripheral speed is 175 m/sec for cylindrical rotor machines and 80 m/sec for salient pole machin 7 Write the expression for air gap length in cylindrical rotor machine 8 Define short circuit ratio of a synchronous gemerator
立即联系/Live Chat
Jul 19 32 Difference between salient pole and non salient pole rotor used in synchronous generator synchronous machine can be characterized by the type of rotor used Since these rotors are cylindrical the windage loss is reduced The noise produced is also less These rotors Apr 14 32 Cylindrical Rotor A cylindrical rotor machine is also called a non salient pole rotor machinit has its rotor so constructed that it forms a smooth cylinder the construction is such that there are no physical poles to be seen as in salient pole construction
立即联系/Live Chat