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Why not rotating magnetic field produced in three phase transformer?
BKsoni
When the three phase stator windings are fed by a three phase supply, a magnetic flux of constant magnitude, but rotating at synchronous speed is produced. The flux passes through the air-gap, and cuts the rotor conductors which yet are stationary. Due to the relative speed between the rotating flux and the stationary conductors, an emf is induced. ( Faraday's laws of electromagnetic induction ). Since the rotor bars or conductors form a closed circuit, rotor current is produced whose direction as by the Lenz's law, is such as to oppose the very cause producing it. In this case, the cause which produces the rotor current is the relative velocity between the rotating flux of the stator and the stationary rotor conductors. Hence, to reduce the relative speed, the rotor starts running in the same direction as that of the flux and tries to catch up with the rotating flux.
Wiki User
∙ 13y ago
Wiki User
∙ 11y agoWhen the three phase stator windings are fed by a three phase supply, a magnetic flux of constant magnitude, but rotating at synchronous speed is produced. The flux passes through the air-gap, and cuts the rotor conductors which yet are stationary. Due to the relative speed between the rotating flux and the stationary conductors, an emf is induced. ( Faraday's laws of electromagnetic induction ). Since the rotor bars or conductors form a closed circuit, rotor current is produced whose direction as by the Lenz's law, is such as to oppose the very cause producing it. In this case, the cause which produces the rotor current is the relative velocity between the rotating flux of the stator and the stationary rotor conductors. Hence, to reduce the relative speed, the rotor starts running in the same direction as that of the flux and tries to catch up with the rotating flux.
Wiki User
∙ 11y agoBecause the 3 resultant fluxes do not link up to form one resultant rotating flux like in 3phase motors.
AnswerThere is a magnetic flux 'linking' the primary and secondary windings. Flux, though, doesn't 'circulate'; it varies in magnitude and direction, and is 'contained' within the transformer's magnetic circuit (its core).
Wiki User
∙ 11y agomaa chuda lee/..... brehan k lode
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What does a Rotating magnetic field do?
The Field which is continuously rotating with a particular axis is known as rotating magnetic field. It will be created in Three phase induction motor's stator. When the supply is given to stator of three induction motor, the flux of each phases (that are displaced by 120 degrees) will interact. Due to this the resultant Field will be rotating Magnetic Field will be Produced.
Role of stator and rotor in synchronous and induction motor?
Stator is part of rotating mechanical device thats sorrounds the rotor to rotate it through the induced magnetic field while the Rotor, is the one who is rotated by produced magnetic field in the stator,.
What is produced around a wire that has a current?
Magnetic field.
What type of electricity is produced by rotating a coil at a steady rate in a steady magnetic field?
Plain old electricity. There's only one kind.
How demagnetize an electric motor?
A transformer winding only produces a magnetic field when current flows through it. Switch the current off, and the magnetic field disappears. You do not need to 'demagnetise' a transformer winding.
Why transformer not rotating?
transformer is not rotating bcoz for rotating rotating magnetic field is required which is produced only when the current is passed through the windings which are displaced physically by 120degrees and phase difference of 120 degrees where as in transformer there is no phsical displacement of 120degrees hence transformer cannot rotate.
Is there any rotating magnetic field in dc motors?
yeah ,if we consider a 3 phase dc motor ,the rotating magnetic field is produced by rotating the permanent magnet with a constant speed.
What is the principle of operation of three phase squirrel cage induction motar?
three phase induction motor is like a rotating transformer, works on the principle of faraday's law of electromagnetic induction. when ever three phase supply is given rotating magnetic field is produced (rotating magnetic field is produced because current flowing through each phase is delayed 6.66mSec) and the stationary conductor (rotor) is cut by the rotating magnatic field so emf is induced in the conductor (rotor) since rotor is short circuited current flows and this current produces magnatic field. magnatic field produced by the rotor interacts with the rotating magnatic field. this interaction of fields produces movement in the conductor(rotor)(since it is allowed to rotate).
What does a Rotating magnetic field do?
The Field which is continuously rotating with a particular axis is known as rotating magnetic field. It will be created in Three phase induction motor's stator. When the supply is given to stator of three induction motor, the flux of each phases (that are displaced by 120 degrees) will interact. Due to this the resultant Field will be rotating Magnetic Field will be Produced.
Name the types of alternators based on their rotor construction?
1) Rotating armature alternator, rotates in stationary magnetic field. 2) Rotating field alternator, the magnetic field is rotating.
How do you prove that a rotating magnetic field is produced when a 3 phase supply fed to a 3 phase winding?
The motor will turn
Why rotating magnetic field is not produced in a transformer?
In case of Alternator, the three phases (RYB) are wound on the stator in a sequential manner (R-Y-B-R-Y-B... so on) As we are aware, the three phases are electrically apart by 120deg. so that by adopting such a stator winding, a rotating magnetic field with synchronous speed (120*freq/no. of poles) is developed. Even an emf is induced in the rotor also, with similar synchronous speed, but owing to large inertia of rotor, it cannot attain synchronous speed and stays standstill.In case of transformer, the three-phase windings are wound on three limbs - on each limb LV winding is wound on the core and then HV winding is wound over the LV winding (for increased efficiency of transformer). Due to this constructional arrangement, a rotating magnetic field is not visualized in transformer, rather mutual inductance comes in to picture.
How do you generate sinusoidal voltage?
The most common ways are:Mechanically, by placing a coil in a rotating magnetic field, or a rotating coil in a fixed magnetic field. This is how AC power is generated.Electronically, using an oscillator circuit. This is how sinusoidal waveforms are produced in all sorts of electronic equipment.
Why doesn't a transformer work only on a DC supplyand not in ac supply?
A transformer doesn' t work with DC current because voltage is induced in the output winding of the transformer when a magnetic field passes through the coils of this winding. This happens with AC current because the magnetic field is continually expanding and contracting. With a DC current the magnetic field is unchanging other than when you first turn it on. Since the magnetic field is not moving it is not moving through the windings and no voltage is produced.
What happens in earth interior to produce earths magnetic field describe the layer where the magnetic field is produced?
What escapes the crust is what we observe as the earths magnetic field. The outer core is a rotating mass of fluid metal that induces an electrical current which in turn generates the magnetosphere.
What happens in the Earth's interior to produce Earth's magnetic field describe to layer where the magnetic field is produced?
What escapes the crust is what we observe as the earths magnetic field. The outer core is a rotating mass of fluid metal that induces an electrical current which in turn generates the magnetosphere.
Role of stator and rotor in synchronous and induction motor?
Stator is part of rotating mechanical device thats sorrounds the rotor to rotate it through the induced magnetic field while the Rotor, is the one who is rotated by produced magnetic field in the stator,.
