• 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.

  • Salient pole rotor vs. non-salient pole rotor ...

    Cylindrical rotors are used in high speed electrical machines, usually 1500 RPM to 3000 RPM. Windage loss as well as noise is less as compared to salient pole rotors. Their construction is robust as compared to salient pole rotors. Number of poles is usually 2 or 4. Damper windings are not needed in non-salient pole rotors.

  • 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.

  • 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 187 Reads

  • Electrical Machines | Electrical Engineering | EE | GATE ...

    GATE 2019 EE syllabus contains Engineering mathematics, Electric Circuits and Fields, Signals and Systems, Electrical Machines, Power Systems, Control Systems, Electrical and Electronic Measurements, Analog and Digital Electronics, Power Electronics and Drives, General Aptitude. We have also provided number of questions asked since 2007 and average weightage for each subject.

  • 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.

  • 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.

  • 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.

  • Slide 1

    * Synchronous Machines Salient-pole synchronous machine Cylindrical or round-rotor synchronous machine Most hydraulic turbines have to turn at low speeds (between 50 and 300 r/min) A large number of poles are required on the rotor Hydrogenerator Turbine Hydro (water) D » 10 m Non-uniform air-gap N S S N d-axis q-axis Salient-Pole Synchronous ...

  • What is cylindrical rotor machine - answers.com

    The speed of the machine is tied to the power supply frequency and the number of poles the machine has. It becomes impractical to make a round rotor machine with many poles, so machines that spin ...

  • 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)

  • Synchronous Machines Notes part2 | electric equipment

    Mar 28, 2015· 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 machine.

  • Synchronous Machine Torque Equation - EEEGUIDE

    Dec 20, 2015· Synchronous Machine Torque Equation:. Figure 5.36 shows a Synchronous Machine Torque Equation with a round rotor. The rotor is initially stationary with fixed north-south poles created by dc excitation. Let the 3-phase winding of the stator be connected to a 3-phase supply of fixed voltage V (line) and fixed frequency f (this is known as the infinite bus).

  • 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

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

    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...

  • What is reluctance torque? Why does it exist in the ...

    Jun 27, 2015· Reluctance torque is created due to the saliency of the rotor. Reluctance in a magnetic circuit is analogous to resistance in Electric circuit. It is like the resistance offered to the magnetic flux lines by the medium. Metals like Iron provide...

  • Synchronous Machine - an overview | ScienceDirect Topics

    In synchronous machines, the rotor carries the field winding with the armature winding mounted on the stator. Fig. 8.7 show the rotors of three different types of synchronous machines: a cylindrical rotor, a salient pole rotor and a rotor with surface-mounted permanents. Cylindrical rotors tend to be used in higher-speed machines in ...

  • 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

  • Difference between Salient Pole & Cylindrical Pole Rotors ...

    Difference between salient pole & cylindrical pole rotors: We can define a synchronous generator or alternator as a mac... Difference between salient pole & cylindrical pole rotors: ... We can define a synchronous generator or alternator as a machine which converts mechanical energy into alternating type electrical energy. It consists of a ...

  • EE 340 Spring 2011 - University of Nevada, Las Vegas

    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 poles. Rotors are made laminated to …

  • 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 …

  • 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 ...

  • multiple choice questions on synchronous machines # 6 ...

    multiple choice questions on synchronous machines # 6 ... In a cylindrical rotor synchronous machine, the phasor addition of stator and rotor mmfs is possible because A) two mmfs are rotating in opposite directions B) two mmfs are rotating in same direction at different speeds ... multiple choice questions on synchronous machines # 12

  • Design of Synchronous Machine

    machine to operate in synchronism. The synchronizing power is inversely proportional to the synchronous reactance and hence the machines designed with higher value air gap flux density will have better ability to operate in parallel with other machines. Following are the usual B av assumed Cylindrical rotor machine : 0.55 to 0.65 wb/m2

  • Torque in Round Rotor Machine - EEEGUIDE.COM

    Dec 20, 2015· 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.

  • 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

  • What is negative sequence current and how does it affect ...

    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 machine.

  • 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.

  • DESIGN OF ELECTRICAL MACHINES - Academia.edu

    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 machines. 7. Write the expression for air-gap length in cylindrical rotor machine. 8. Define short circuit ratio of a synchronous gemerator.