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Why induction motor is called as rotating transformer?
it may be because rotating transformer also have one winding turns while the other remains stationary.because the one that was stationary is the one that accepts signals and the one that was turning is the one who converts he signal into current and distribute it to the motors engine
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Because there is no electrical connection between its stator and its rotor. Voltages and, therefore, circulating currents are induced into the rotor by a rotating magnetic flu…x set up in the air gap by the stator windings.
In dc motors, the electric power is conducted directly to the armature (i.e., rotating part) through brushes & commutator. Hence, in this sense a dc motor can be called as a C…onduction motor. However, in ac motors, the rotor does not receive any electric power by conduction but by induction in exactly the same way as the secondary of a two winding transformer receives its power from the primary. That is why such motors are called as Induction motors. An induction motor can be treated as a rotating transformer i.e., one in which primary winding is stationary but secondary is free to rotate.
In an induction motor, power is supplied to the rotor using a changing magnetic flux i.e. without any true conductive contact. Similarly, in a transformer, the power is transf…erred from the primary coil to the secondry one using a varying magnetic flux and the plates have no physical linkage. Hence, the similarity between an induction motor and a transformer is very basic i.e. they both use the phenomenon of electromagnetic induction to transfer power from one part to another.
Because of the presence of the air-gap between stator and rotor in motor the magnetization current is much higher than that of a transformer in addition to the friction and wi…ndage losses due to the rotation of the rotor.
as we know that a rotating magnetic field is created by the satator current,and so in the rotor there is induced current and there by the rotor developes a unidirectional torq…ue. so since the rotor runs with a speed other than the synchronous speed of rotating magnetic field produced by stator current so it is called as asynchronous motor.. asynchronous -means not moving with synchronous speed --------------------mrityunjay (kiit university . b.tech 2nd year student)
as it works on induced voltage on rotor according to faradays law of electromagnetic inductio ac motors called as induction motor The AC motors works in the same principle as… that of a Transformer. The AC supply is given to the stator and a rotating flux is set up in it. According to Faraday's Law, a voltage is induced in the rotor conductors as these conductors are in closed circuit, a current starts flowing through them as a result a magnetic flux is created around the conductors. Due to the interaction of the fluxes a torque is setup and the rotor rotates.
simply change any two phase connections out of three & the direction will reverse. Magic.........
We know that relative speed is responsible to induce voltage. If rotor and the rotating field (stator) speed is same, no voltage will induced because relative speed will be ze…ro. For IM relative speed is not zero and it does not move with sync. speed, and so it is called asynchronous motor.
1. Induction Motor has an air-gap but transformer has no air gap rather it is mutually link. 2. Induction Motor has high no-load current than transformer. 3. Induction Motor …is a dynamic device. 4. Induction Motor has high power factor.
Transformer has windings
Stray losses refer to secondary voltage to be inappropriately distributed to transformers, induction motors and generators. Stray losses essentially mean that there is leakage… that causes a weakening of the voltage being delivered to the motor.
by changing the ryb phase altornat e.g. rby ,bry , yrb we change the direction of the induction motor .. . ..
flux links with primary and secondary winding similar in motor it links with stator and rotor winding
Swap any two phase connections. You may need to adjust the starting connections/mechanism as well.
Induction motor is operating at transformer's principle.so,it is called ROTATING TRANSFORMER.
an induction motor rotes because of the magnetic field produced around it and as the current flows
In a three phase induction motor, the rotation of motor is reversed by interchanging a phase on the motor terminals. (RYB - gives a direction, RBY gives reverse direction)…