In slip ring induction motors the rotor is wound type. In the motor the slip rings, brushes are provided. Compared to squirrel cage rotor the rotor construction is not simple. Cylindrical laminated core rotor is wound for as the number of poles of the stator. At starting the 3 phase windings are. Know about the most popular and almost unbreakable construction of Squirrel Cage Induction Motor. Know about the different winding slots, lamination of the stator and its construction. Also appreciate the rugged construction of squirrel cage rotor and know the spectacular reasons for the skewed arrangements of the rotor conductors. Know how a rotating magnetic field is produced.

Squirrel Cage Induction Motor vs Slip Ring Induction Motor Comparison of Squirrel cage induction motor with slip ring induction motor (Wound Rotor Induction Motor) is listed in the below table: Squirrel Cage Induction Motor Slip ring (wound rotor) Induction Motor In Squirrel cage induction motors the rotor is simplest and most rugged in construction In slip ring induction motors the rotor is wound type. In the motor the slip rings, brushes are provided. Compared to squirrel cage rotor the rotor construction is not simple. Cylindrical laminated core rotor with heavy bars or copper or aluminium or alloys are used for conductors. Cylindrical laminated core rotor is wound for as the number of poles of the stator. Rotor conductors or rotor bars are short circuited with end rings. At starting the 3 phase windings are connected to a star connected rheostat and during running condition, the windings is short circuited at the slip rings.

Rotor bars are permanently short circuited and hence it is not possible to connect external resistance in the circuit in series with the rotor conductors. It is possible to insert additional resistance in the rotor circuit. Therefore it is possible to increase the torque ( the additional series resistance is used for starting purposes) Cheaper cost Cost is slightly higher. No moving contacts in the rotor. Carbon brushes, slip rings etc are provided in the rotor circuit. Higher efficiency. Comparatively less efficiency.

Low starting torque. It is 1.5 time full load torque. High starting torque. It can be obtained by adding external resistance in the rotor circuit. Speed control by rotor resistance is not possible. Speed control by rotor resistance is possible. Starting current is 5 to 7 times the full load.

Protokol uzi schitovidnoj zhelezi blank. Less starting current. Advantages of Squirrel-Cage Induction Motors The advantages of squirrel-cage motors compared with the slip ring induction motors are given below (i) They are more robust and cheaper (ii) Comparatively they have higher efficiency and power factor (iii) Since the risk of sparking is eliminated by the absence of slip rings and brushes, they are explosion-proof. Advantages of Slip ring Induction Motors The advantages of the wound rotor (Slip ring) Induction motors compared with the squirrel-cage motors are given below (i) They have very high starting torque (ii) They have very low starting current (iii) They have a means of varying speed by use of external rotor resistance. Read More: Thanks for Reading Please leave your comments below.

/ 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.