The stator construction of a three-phase induction machine is similar to that of a three-phase synchronous machine A three-phase winding is placed in a number of slots in order to produce a rotating sinusoidal mmf wave As with other ac machines, the speed of rotation of the stator magnetic field is described as the synchronous speed and is .
nent magnets in synchronous machines are restricted to those with ratings much lower than large turbine-driven generators, which is the subject of this book Turbine-driven generators (for short: turbogenerators) take advantage of the fact that magnetic ﬁelds can be created by the ﬂow of electric currents in conductors See Figure 13 NS
Also when a 3 phase winding is fed with a 3 phase supply, then a magnetic flux of constant magnitude but rotating at Synchronous speed is produced To understand the working of a Synchronous Motor easily, let us consider only two poles in the stator and rotor
Jul 16, 2018· In case of three phase generators, three sets of windings are required, one for each phase connected in star The cross-sectional area of these windings must be enough to carry rated current of the machine Figure below illustrate the simplified construction of synchronous machine
Mar 06, 2019· The construction of an alternator consists of field poles placed on the rotating fixture of the machine An alternator is made up of two main parts: a rotor and a stator The rotor rotates in the stator, and the field poles get projected onto the rotor body of the alternator
The stator in the synchronous generator is a stationary armatureThis consists of a core and the slots to hold the armature winding similar to the armature of a dc generatorThe stator core uses a laminated constructionIt is built up of special steel stampings insulated from each other with varnish or paperThe laminated construction is basically to keep down eddy current loss
Construction of Three Phase Synchronous Motor 12:26 PM Synchronous Motor No comments Similar to dc machine where there is no constructional difference between a generator and motor, There is no difference between the construction of synchronous motor and the alternator, both being the synchronous machin
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.
Jul 12, 2013· Construction of Three Phase Synchronous Motor Similar to dc machine where there is no constructional difference between a generator and motor, There is no difference between the construction of synchronous motor and the alternator, both being the synchronous machin
Synchronous motor construction is very similar to synchronous generator construction except that most motors are salient-pole machin Principle and Operation of Synchronous Motor When an induction motor is connected to a three-phase supply, a rotating magnetic field is established; this induces currents in the rotor windings, thereby producing a torque
The principal components of a synchronous motor are the stator and the rotor The stator of synchronous motor and stator of induction motor are similar in construction With the wound-rotor synchronous doubly fed electric machine as the exception, the stator frame contains wrapper plate Circumferential ribs and keybars are attached to the wrapper plate
construction requiring hardly any maintenance, that they are comparatively cheap, and require supply only to the stator Applications of three-phase induction motor: Lifts Cranes Hoists Large capacity exhaust fans Driving lathe machines Crushers Oil extracting mills Textile and etc Three-Phase Induction Motor types:
We have seen the various features of three phase alternatorSimilar to a dc generator it is a reversible machineIf a three phase supply is given to the stator of a three-phase alternator, it can work as a motorAs it is driven at synchronous speed, it is called Synchronous generatorSo if alternator is run as a motor, it will rotate at a synchronous speed
Jan 20, 2017· But, if the rotor is rotated upto the synchronous speed of the stator by means of an external force (in the direction of revolving field of the stator), and the rotor field is excited near the synchronous speed, the poles of stator will keep attracting the opposite poles of the rotor (as the rotor is also, now, rotating with it and the position of the poles will be similar throughout the cycle)
In salient pole type of rotor consist of large number of projected poles (salient poles) mounted on a magnetic wheelConstruction of a salient pole rotor is as shown in the figure at left The projected poles are made up from laminations of steel The rotor winding is provided on these poles and it ,
Let us see the application of this principle in case of synchronous motor Consider a three phase synchronous motor, whose stator is wound for 2 pol The two magnetic fields are produced in the synchronous motor by exciting both the windings, stator and rotor with three phase ac supply and dc supply respectively
Construction of synchronous machines In a synchronous generator, a DC current is applied to the rotor winding producing a rotor magnetic field The rotor is then turned by external means producing a rotating magnetic field, which induces a 3-phase voltage within the stator winding • ,
In electrical equipment the anchor’s winding would be induced by the magnetic field, although the rotor takes this part in three-phase induction motors Induction motor has the same physical stator as a synchronous machine with an alternate rotor development Induction motor might be worked as either motors or generator
Synchronous machines can be used as generators or motors They are of 3-phase construction, even though some special exceptions can be found A bulk of the applications are within power ranges roughly varying from a megawatt level to several tenths (or even hundreds) of megawatts with rated voltages from 3 ,
Construction of a Synchronous Machine Circuit Globe Construction of a Synchronous Machine Construction of a Synchronous Machine, ie alternator or motor consists of two main parts, namely the stator and the rotorThe stator is the stationary part of the machine It carries the armature winding in which the voltage is generated
Jun 16, 2018· Working Principle of Permanent Magnet Synchronous Motor (PMSM): The working principle of permanent magnet synchronous motor is same as that of synchronous motor When three phase winding of stator is energized from 3 phase supply, rotating magnetic field is set up in the air gap
The losses in a synchronous machine affect its cost, rating, and performance The efficiency of a synchronous machine is frequently determined by measuring the losses, using techniques that are precisely defined by ANSI, IEEE, and NEMA measurement standards The efficiency is defined in the same way as it is for , Read More »
3 phase synchronous generator or alternator or synchronous machine construction Alternator is the machines which generates the power which we are using today Now let us discuss about construction of alternator or synchronous machine The most important parts in alternator design are stator & rotorModern alternators prefer rotating field type of constructionUnlike dc generators i n case of .
In this article, let us discuss about synchronous generator working principle Synchronous Generator The rotating and stationary parts of an electrical machine can be called as rotor and stator respectively The rotor or stator of electrical machines acts as a power-producing component and ,
AC motors can be divided into two main categories - (1) Synchronous motor and (2) Asynchronous motor An asynchronous motor is popularly called as Induction motor Both the types are quite different from each other Major differences between them .
Synchronous motor and induction motor are the most widely used types of AC motor Construction of a synchronous motor is similar to an alternator (AC generator)A same synchronous machine can be used as a synchronous motor or as an alternator Synchronous motors are available in a wide range, generally rated between 150kW to 15MW with speeds ranging from 150 to 1800 rpm
Three-Phase Synchronous Machines The synchronous machine can be used to operate as: 1 Synchronous motors 2 Synchronous generators (Alternator) Synchronous generator is also referred to as alternator since it generates alternating voltage Synchronous machine is designed to be operating at synchronous speed, nS Two main parts:
These motors contain multi-phase AC electromagnets on the stator of the motor that create a magnetic field that rotates in time with the oscillations of the line current A synchronous-motor is doubly fed if it is supplied with independent excited multi-phase AC electromagnets on both the rotor and stator Construction of Synchronous Motor
Construction of a Synchronous Machine Construction of a Synchronous Machine, ie alternator or motor consists of two main parts, namely the stator and the rotorThe stator is the stationary part of the machine It carries the armature winding in which the voltage is generated
(iv) Stability: The maximum power output of a machine under steady state condition is inversely proportional to synchronous reactance If higher value of flux density is used it leads to smaller number of turns per phase in armature winding