cylindrical rotor machine

Synchronous Machine Model and Its Basics - EEEGUIDE

Synchronous Machine Model and Its Basics – As stated above the cylindrical-rotor synchronous machine offers constant permeance to mmf waves irrespective of the mechanical position of the rotor and is, therefore, simpler to model. Figure 8.1 shows the cross-sectional view of a 2-pole* cylindrical-rotor synchronous machine.

Difference between Salient Pole and Non Salient Pole ...

May 01, 2018· Explained the difference between Salient Pole and Non Salient Pole rotor | compare salient pole and cylindrical rotor | difference between salient pole and cylindrical pole machine | difference ...

The Synchronous Machine - University of Colorado Boulder

are valid for a cylindrical rotor machine, in which the length of the air gap is uniform. In a 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

Synchronous motor - Wikipedia

Cylindrical, round rotors, (also known as non salient pole rotor) are used for up to six poles. In some machines or when a large number of poles are needed, a salient pole rotor is used. The construction of synchronous motor is similar to that of a synchronous alternator. Operation

IV. Principles of rotating machines - Hacettepe University

Elementary cylindrical-rotor, two-phase synchronous machine for Problem 4.22 (Fitzgerald, 6th ed.) Ex2: Figure on the right shows a cross section of a machine having a rotor winding f and windings a and b whose axes are in quadrature. The self-inductance of each stator windind is Laa and of the rotor is Lff. The air gap is uniform.

What is cylindrical rotor machine - answers.com

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 machines. In cylindrical rotor, as it rotates ...

Electrical Machines II 3 Synchronous Generator Operation 3 ...

Electrical Machines II Prof. Krishna Vasudevan, Prof. G. Sridhara Rao, Prof. P. Sasidhara Rao 3 Synchronous Generator Operation 3.1 Cylindrical Rotor Machine Ixa xa xl ra Ixl I Et E Ira V V Load A Et E I σ (a) (b)phasor diagram for R load xs ra I Et IZs IXs Zs …

Difference between Cylindrical and Salient Pole Rotor ...

Oct 31, 2016· The main difference between the Cylindrical Rotor and Salient Pole classes of machine lies in the rotor construction. The cylindrical rotor type has a uniformly cylindrical rotor that carries its excitation winding distributed over a number of slots around its periphery.

Few Words About Synchronous Machines

The cylindrical rotor type has a uniformly cylindrical rotor that carries its excitation winding distributed over a number of slots around its periphery. This construction is unsuited to multi-polar machines but it is very sound mechanically. Hence it is particularly well adapted for the highest speed electrical machines and is universally employed for two pole units, plus some four pole units.

Constrution of Synchronous Generator (Stator and Rotor ...

The limiting factor fore the size of the rotor is the centrifugal force acting on the rotating member of the machine. As mechanical strength of salient pole type is less, this is preferred for low speed alternators ranging from 125 r.p.m. to 500 r.p.m. The prime movers used to drive such rotor are generally water turbines and I.C. engines.

Chapter 6. Synchronous Machines - Educypedia

Synchronous Machines 6 where w is the angular frequency of emf in electrical radians per second and wm the angular speed of the rotor in mechanical radians per second. When w and wm are converted into cycles per second or Hz and revolutions per minute respectively, we have

What are the advantages of a round rotor generator than a ...

What are the advantages of a round rotor generator than a salient pole rotor? ... salient pole rotors are well suited to low speed large dia machines and smooth cylindrical rotors for high speed ...

Construction of Alternator | Electrical4U

Mar 06, 2019· 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 …

Theory of cylindrical rotor machine ~ your electrical home

Theory of cylindrical rotor machine. 2:19 PM Synchronous generator No comments. Let us consider the phasor diagram for alternator as shown in the Fig. 1. Fig. 1: Let E = E.M.F. induced in each phase. V = Terminal voltage. Φ = Phase angle between voltage and current ...

Electrical Machines - Synchronous Generator Field

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 3600 or 1800 rpm (with 60hz systems). Remember that machine power is a function of the size of the machine.

ELECTRICAL MACHINE-II

ELECTRICAL MACHINE-II . Subject Code - BEE 1401 . For B-Tech 4th SEM EE & EEE [Part-I] ... cylindrical rotor theory, phasor diagram, open circuit & short circuit characteristics, armature reaction reactance, synchronous reactance, SCR, load characteristics, potier reactance, ... Theory of salient pole machine: Blondel’s two reaction theory ...

Power Angle Characteristics of Synchronous Machines ...

May 19, 2017· 13. 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

Rotor Testing and Monitoring - ccj-online.com

• IEC 60034-3: Specific Requirements for Cylindrical Rotor Synchronous Machines • IEEE C50.10: General Requirements for Synchronous Generators • IEEE C50.13: Standard for Cylindrical Rotor 50 Hz and 60 Hz Synchronous Generators Rated 10 MVA and Above • IEEE 67: Guide for the Operation and Maintenance of Turbine Generators

Construction of Alternator | Electrical Study App by SARU TECH

The cylindrical rotor is generally used for very high speed operation and are employed in steam turbine driven alternators like turbo generators.. The cylindrical rotor type machine has uniform length in all directions, giving a cylindrical shape to the rotor thus providing uniform flux cutting in all directions.

Synchronous machines - SlideShare

Dec 31, 2016· Types of Synchronous Machines Salient-pole synchronous machine Cylindrical or round-rotor synchronous machine 5. 1. Most hydraulic turbines have to turn at low speeds (between 50 and 300 rpm) 2. A large number of poles are required on the rotor Salient-Pole Synchronous Generator 6. Salient-Pole Synchronous Generator 7.

Synchronous Machines - courses.ece.vt.edu

Figure 6: Steady-state torque-angle characteristic of a cylindrical rotor synchronous machine. As the rotor moves within the stator, the field induces voltage in the armature winding of the machine. This voltage is called the generated voltage in a generator and the back EMF in a motor.

What is the difference between a salient pole and a ...

Mar 02, 2017· 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...

Electrical Machines Questions and Answers – Elementary ...

May 19, 2017· This set of Electrical Machines Multiple Choice Questions & Answers (MCQs) focuses on “Elementary Synchronous Machines”. 1. Consider a single phase synchronous machine of cylindrical rotor type. A single phase supply is given to the stator winding and a voltmeter is connected across rotor winding. For what value of θ r, the voltmeter reads ...

Construction of a Synchronous Machine - Circuit Globe

Construction of a Synchronous Machine Construction of a Synchronous Machine, i.e. alternator or motor consists of two main parts, namely the stator and the rotor.The stator is the stationary part of the machine. It carries the armature winding in which the voltage is generated.

Cylindrical Rotor | Synchronous-Motor | GE Power Conversion

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.

3 Synchronous Generator Operation - NPTEL

cylindrical rotor (non-salient pole) machine. This was so as the procedure followed therein was valid only when both the armature and main field m.m.f.’s act upon the same magnetic circuit and saturation effects are absent. 3.2.1 Theory of Salient-pole machines (Blondel’s Two-reaction Theory)

Two Reaction Theory – Salient Pole Synchronous Machine ...

Salient Pole Synchronous Machine Two Rection Theory. In the cylindrical rotor synchronous machine, the air gap is uniform. The pole structure of the rotor of a salient pole machine makes the air gap highly non-uniform. Consider a 2 pole, salient pole rotor rotating in the anticlockwise direction within a 2 pole stator as shown in the figure below.

Torque in Round Rotor Machine - EEEGUIDE.COM

Torque 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 themselves.

II. Synchronous Generators

cylindrical-rotor (non-salient pole) machines and salient-pole machines. ... • Cylindrical rotor alternators are usually long, and the problem of air f low requires very special attention. • The cooling medium, air or hydrogen is cooled by passing over pipes

Why cylindrical type rotor is not laminated in synchronas ...

Jun 03, 2017· 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 synchronous machine is excited by DC supply,so the rotor flux is DC.

On the Theory of Cylindrical Rotor A. C. Machines ...

On the Theory of Cylindrical Rotor A. C. Machines, Including Main Flux Saturation Article in IEEE Transactions on Power Apparatus and Systems PER-4(4):754 - 761 · May 1984 with 177 Reads

Synchronous Machines - hcmut.edu.vn

A cross-sectional sketch of a three-phase cylindrical-rotor synchronous machine is shown schematically in Fig. 5.2. 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 ...

Rotor (electric) - Wikipedia

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 bars.

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