If a rotor without stator having 3 phase AC winding and free to rotate, if 3 phase power supply is given to its winding through slip ring, then what happen, rotor will rotate or not, if yes please explain?
a 3 phase supply produces a rotating magnetic field, but yet i think it would be useless without a stator. basically a.c motors or induction motors are also called as rotating transformers, which means that the rotor and stator cannot function independently. the use of a 3-phase winding only eliminates the use of a capacitor, which is used with single phase induction motor, to help it to start, since the same aren't self starting, and in the case of 3-phase motors, the winding is present on the stator, and the magnetic field that is produced by the energizing of the windings forces the rotor in to action. so hence the idea of a rotor working without a stator or vice versa sounds absurd
An AC motor is an electric motor driven by an alternating current. It commonly consists of two basic parts, an outside stationary stator having coils supplied with alternating current to produce a rotating magnetic field, and an inside rotor attached to the output shaft that is given a torque by the rotating field. source:http://en.wikipedia.org/wiki/AC_motor In this they haven't mentioned about rotor winding??
Wound rotors An alternate design, called the wound rotor, is used when variable speed is required. In this case, the rotor has the same number of poles as the stator and the windings are made of wire, connected to slip rings on the shaft. The flux must be cut in order to rotate the motor. The shaft itself cannot rotate.
Hello friends, The alternator's stator-winding can be damaged if energization persists for a longtime and/or stator-current is much greater than its nominal rating. The rotor field-winding is more likely to suffer because of centrifugal-forces produced during acceleration, or because line-frequency currents are induced into abnormal paths in the rotor-iron and field-winding. On the other hand, insulation-resistance is not likely to deteriorate. Thanks a lot Anthony
@aarthivg Actually AC motor is of two types 1. Induction Motor 2. Synchronous Motor In induction motor , stator winding is supplied with 3 phase AC and rotor is wound with armature winding which is neither supplied with AC nor by DC. In synchronous motor, stator winding is supplied with 3 phase AC and rotor is wound with DC supplied winding.
