(a) Cutaway view of a three-phase induction motor with a wound rotor and slip rings. To better understand the currents induced in the squirrel cage as caused. Adequately higher than the load starting torque, their difference, called the. A squirrel-cage rotor is the rotating part of the common squirrel-cage induction motor.It consists of a cylinder of steel laminations, with aluminum or copper conductors embedded in its surface.

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• Synchronous motor: Stator poles rotate at the synchronous speed (Ns) when fed with a three phase supply. The rotor is fed with a DC supply. The rotor needs to be rotated at a speed near to the synchronous speed during starting. If done so, the rotor poles get magnetically coupled with the rotating stator poles, and thus the rotor starts rotating at the synchronous speed.

• Synchronous motor always runs at a speed equal to its synchronous speed. Actual speed = Synchronous speed or N = Ns = 120f/P • Learn more about.

• Induction motor: When the stator is fed with two or three phase AC supply, a is produced. The relative speed between stator's rotating magnetic field and the rotor will cause an induced current in the rotor conductors. The rotor current gives rise to the rotor flux. According to, the direction of this induced current is such that it will tend to oppose the cause of its production, i.e. Relative speed between stator's RMF and the rotor. Thus, the rotor will try to catch up with the RMF and reduce the relative speed. • Induction motor always runs at a speed which is less than the synchronous speed.

• Synchronous motors require an additional DC power source for energizing rotor winding. Induction motors do not require any additional power source. • Slip rings and brushes are required in synchronous motors, but not in Induction motors (except wound type induction motor in which slip ring motors are used to add external resistance to the rotor winding).

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• Synchronous motors require additional starting mechanism to initially rotate the rotor near to the synchronous speed. No starting mechanism is required in induction motors. • The power factor of a synchronous motor can be adjusted to lagging, unity or leading by varying the excitation, whereas, an induction motor always runs at lagging power factor. • Synchronous motors are generally more efficient than induction motors. • Synchronous motors are costlier.

Both have 3 a phase stator winding, the squirrel cage has a rotor with bars arranged around it's periphery, these bars are joined at both ends by a continuous ring. This forms a closed circuit of low resistance which is fixed. The wound rotor (slip ring motor) is similar in construction but the bars are replaced by copper windings, similar to those in the stator. They are star connected and the three ends are brought out to slip rings which allow an electrical connection to be made to the outside world.