Why an induction motor sometimes called rotating transformer
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For a better understanding, consider a slip ring induction motor with rotor open cicuited.
It's much like a transformer. Stator, when connected to three phase supply, works like primary of a transformer. It draws magnetising current and sets up a magnetic field (though rotating) which links both primary (stator winding ) and secondary (rotor winding).
Due to rotating magnetic field, an open cicuit voltage, depending upon the turns ratio (stator number of turns per phase / rotor number of turns per phase) is induced across the slip rings (analogous to transformer secondary terminals).
When the slip rings are short cicuited, the motor behaves like a transformer with secondary short cicuited. A heavy current flows in the rotor (secondary). Like in a transformer, ampere turn balance is maintained between stator(primary) and rotor (secondary), and therefore, rotor current is reflected into stator (primary).
So the power is transferred from stator (primary) to rotor (secondary) through magnetic field. The only major difference lies in the fact that in a transformer magnetic field is stationary but pulsating whereas in an induction motor field is rotating but constant in magnitude. In either of the cases, the field is capable of inducing emf in secondary.
Hence, an induction motor may be regarded as a rotating transformer. In fact, that is how the equivalent circuit of an induction motor is developed.
Hope It helps
Plz Mark as Brainliest.
It's much like a transformer. Stator, when connected to three phase supply, works like primary of a transformer. It draws magnetising current and sets up a magnetic field (though rotating) which links both primary (stator winding ) and secondary (rotor winding).
Due to rotating magnetic field, an open cicuit voltage, depending upon the turns ratio (stator number of turns per phase / rotor number of turns per phase) is induced across the slip rings (analogous to transformer secondary terminals).
When the slip rings are short cicuited, the motor behaves like a transformer with secondary short cicuited. A heavy current flows in the rotor (secondary). Like in a transformer, ampere turn balance is maintained between stator(primary) and rotor (secondary), and therefore, rotor current is reflected into stator (primary).
So the power is transferred from stator (primary) to rotor (secondary) through magnetic field. The only major difference lies in the fact that in a transformer magnetic field is stationary but pulsating whereas in an induction motor field is rotating but constant in magnitude. In either of the cases, the field is capable of inducing emf in secondary.
Hence, an induction motor may be regarded as a rotating transformer. In fact, that is how the equivalent circuit of an induction motor is developed.
Hope It helps
Plz Mark as Brainliest.
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Induction motor sometimes called Rotating transformer
- The three stage stator windings of the acceptance engine is practically equivalent to the essential of a three stage transformer. The squirrel-confine rotor of this engine are similar to the transformer optional. Be that as it may, the rotor has shorting rings over the parts of the bargains bars so this is closely resembling a shortcircuited optional.
- So if the rotor is bolted and you apply capacity to the stator (essential) the essential and optional flows are exceptionally high. As far as possible on this bolted rotor (hamper) is the air hole among rotor and stator.
- This is practically equivalent to spillage inductance in a transformer. In an ordinary transformer we typically attempt to limit spillage inductance. In the engine, it is our companion.
- In any case, the high rotor current creates attractive motion which connects with the pivoting transition vector created by the stator, and makes the rotor begin to turn. As the rotor accelerates, the back-e.m.f. created decreases the rotor (and stator) current and our transformer turns into an engine.
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