The phasor addition of stator and rotor mmfs in a cylindrical rotor synchronous machine, is possible because a) mmfs are rotating in opposite direction b) mmfs are rotating in same direction at different speeds c) mmfs are stationary with respect to each other d) one mmf is stationary and the other mmf is rotating View Answer Answer: c Explanation: The phasor addition is possible due to the ....
Since the rotor can be balanced easily and centrifugal forces will be evenly distributed, the rotor of the round (cylindrical) rotor generator can be run at higher rotational speed...
The cylindrical rotor type machine has a uniform length in all directions, giving a cylindrical shape to the rotor thus providing uniform flux cutting in all directions The rotor, in this case, consists of a smooth solid steel cylinder, having a number of slots along its outer periphery for hosting the field coils...
Note : With increase in δ power increases and with decrease in δ power decreas Power in case of synchronous machines depends on the angle δ...
In large synchronous machines, the field is produced by large electromagnets placed on the rotor The rotor construction can either be cylindrical (also called round-rotor or non-salient) or have a varying air gap length (a salient pole machine)...
C Concordia (General Electric Company, Schenectady, N Y) : We have recently had occasion to apply the methods given by Crary to the determination of the stable and unstable,...
It has been recognized recently that the magnetic coupling between the direct and quadrature axes of saturated synchronous machines (cross-magnetizing phenomenon) plays an important role in their analysis using the two-axis frame models...
Synchronous Machines Revised: October 12, 2018 2 of 23 Figure 1: Cross-sections of synchronous machin As shown in Figure 1, the rotor can be of either the salient-pole type or the cylindrical (non-...
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 windings This rotor is made from a solid cylindrical forging, and machines out the pole bodies and pole tips The field windings ....
CONSTITUTION:A cylindrical rotor has a cylindrical field core 2, a plurality of field coils wound in a plurality of coil holding grooves g1-g12 formed radially on the outer peripheral surface of the core 2, and a rotor shaft 3 engaged with the core 2 Inward flanges 41, 42 are respectively formed at the edges of the opposite openings of two coil holding grooves such as coil holding grooves g1 ....
cylindrical-rotor, machines The salient-pole machine has concentrated field windings and generally is cheaper than the cylindrical-rotor machine when the speed is low, (less than 1,500 rev/min) Salient-pole alternators are generally used when the prime mover is a water turbine or a reciprocating engine In the round or cylindrical rotor case, the held winding is placed in slots along the ....
Within the stator bore is the rotor which is magnetised by a winding carrying DC current The main difference between the Cylindrical Rotor and Salient Pole classes of machine lies in the rotor ,...
This article provides design and finite element analyses information of two possibilities of cylindrical rotor synchronous machines' excitation winding design...
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Why is the salient pole rotor in a synchronous machine made of laminated steel whereas a cylindrical rotor does not have any lamination?...
Introduction to Synchronous Machine There are two main types of synchronous machine: cylindrical rotor and salient pole In general, the former is confined to 2 and 4 pole turbine generators, while salient pole types are built with 4 poles upwards and include most classes of duty...
The cylindrical rotor type alternator has two or four poles on the rotor Such a construction provides a greater mechanical strength and permits more accurate dynamic balancing The smooth rotor of the machine makes less windage losses and the operation is less noisy because of the uniform air gap...
Cylindrical, round rotors, (also known as non salient pole rotor) are used for up to six pol In some machines or when a large number of poles are needed, a salient pole rotor is used In some machines or when a large number of poles are needed, a salient pole rotor is used...
They are smaller in diameter but having longer axial length Cylindrical rotors are used in high speed electrical machines, usually 1500 RPM to 3000 RPM...
be given to cylindrical-rotor machines; the effects of salient poles are taken up in Sections 56 and 57 51 INTRODUCTION TO POLYPHASE SYNCHRONOUS MACHINES As indicated in Section 421, a synchronous machine is one in which alternating current flows in the armature winding, and dc excitation is supplied to the field winding The armature winding is almost invariably on the stator and is ....
Lamination is done in any machine to reduce the effect of eddy current loss Eddy Current can be induced within nearby stationary conductors by a time-varying magnetic field created by an AC source only(Not DC ) Since Rotor of the cylindrical syn....
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armature n p cylindrical non-salient than that of the induction machine The rotor of the synchronous machine is a rotating electromagnet with Cylindrical rotor the individual rotor poles are produced...
In the round rotor synchronous machine, q-axis magnetic circuit saturates appreciably more than that along the d-axis because of the presence of the rotor teeth In the second section, a new method to calculate the q-axis saturation characteristic from the existing d-axis saturation characteristic has been presented We have next calculated the saturated values of the d- and q-axis self ....
ok actually i am looking for the answer also but this is what i have got so far,you can understand cylindrical rotor in comparison to Salient pole...
PHASOR DIAGRAM OF CYLINDRICAL ROTOR ALTERNATOR AT LAGGING POWER FACTOREfIaXsI aZ sVtIa raIaZ s = ra + jX s E f = Vt + I a ra + jI a X s = Vt + I a Z s Internal power factor angle , = + PHASOR DIAGRAM OF CYLINDRICAL ROTOR ALTERNATOR AT LEADING POWER FACTORCase IEf IaIaXsIaZsIa raVt = Case IIEfIaXsIaZsIa Ia raVt = PHASOR DIAGRAM OF CYLINDRICAL ....
1 Synchronous Machines 10 Introduction One might easily argue that the synchronous generator is the most important component in the power system, since synchronous...
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....
Cylindrical-Rotor Synchronous Generator Stator Cylindrical rotor 9 Operation Principle The rotor of the generator is driven by a prime-mover A dc current is flowing in the rotor winding which produces a rotating magnetic field within the machine The rotating magnetic field induces a three-phase voltage in the stator winding of the generator...
We can define a synchronous generator or alternator as a machine which converts mechanical energy into alternating type electrical energy It consists of a stator and a rotor...