• Synchronous motor: Stator poles rotate at the synchronous speed (Ns) when fed with a three phase supply. Zvuk prizhka mario. 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.

Please have a look at the below figures of Squirrel Cage Induction and Wound Rotor / Slip Ring Induction Motor. The figure itself depicts many difference.

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). • Synchronous motors require additional starting mechanism to initially rotate the rotor near to the synchronous speed.

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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.

/ bhanu chaitanya Describe difference between constrution of SLIPRING and SQURREL cage motor.? The windings on the rotor of a squirrel cage motor is comprised of aluminum (or sometimes copper) bars embedded in the steel laminations of the rotor. The ends of the rotor bars are shorted together by rings at each end of the rotor.

There is no external electrical connection to the rotor. The bar and ring structure looks like an exercise wheel for a pet squirrel. The rotor of a slip-ring motor is wound with wire coils. The ends of the windings are connected to revolving joint so that resistors or other circuitry can be inserted in series with the rotor coils through carbon brushes that slide on the slip-rings allowing an electrical connection with the rotating coils. That covers the difference in construction.

Other details of construction are essentially the same for both types of motor. Edit 1 The above information refers to two types of induction motors. Synchronous AC motors also have Pan Cake Slip Rings through which the rotor winding is energized by a direct current. There is no such thing as a slipring motor.

There is either a squirreal cage or wound-rotor motor for induction machines. Is this wat u meant? Go here and follow the references at the bottom of the page. The slip ring is a form of squirrel cage motor The Super Miniature Slip or wound rotor motor is an induction machine where the rotor comprises a set of coils that are terminated in sliprings to which external impedances can be connected. The stator is the same as is used with a standard squirrel cage motor.

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