Remember that in DC machines we had brushes and commutators. They do not rotate and are connected to the outside circuitry. Slip rings are metallic circular rings mounted and rotating with the rotor shaft and connected to the rotor windings but insulated from the rotor body.īrushes are spring loaded to make good contact with the surface of the rings. The arrangement for windings on the rotor, which rotate, to be connected to outside circuitry that is stationary is done through slip rings.
The windings must be connected to circuits outside of the rotor, though not to the three voltage lines. The rotor of the latter, however, as the name implies, has windings. The rotor of the squirrel cage motor has no winding, and there is no need for the rotor to be electrically connected to any electricity. One type is called Squirrel cage motor and the other is called wound rotor induction motor (WRIM). The difference again comes from the structure of the rotor, and the two types are named based on the rotor structure. That is to say, in principle, one can interchange the stators of two similar (in size and power) synchronous and induction motor In this sense, the structure of the stator for a synchronous machine and an induction machine is the same, and only the rotors differ from each other.
In other words, it lies in how the magnetic field in the rotor is made. Hence, one can say the difference between synchronous and induction machines lies in their rotors. This principle, together with the rotating magnetic field, constitutes the basis for the operation of induction motors and generators. Remember, also, that it is the relative motion between a wire and a magnetic field that counts that is to say, the wire can be stationary while the magnetic field moves.Īsynchronous motor: Another name for an induction motor.
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