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 slip rings 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 slip rings through which the rotor winding is energized by a direct current.
what's a constrution? which slipring? what is a squrrel? make effort to give full comprehendible query.
