induction motor

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induction motor

  1. 1. INDUCTIONMOTOR
  2. 2.  An induction motor works ontransforming action. The stator works as the primary whilethe rotor works as the secondary. It is also called asynchronous motor.
  3. 3.  It consists of two parts:1. Stator - It is the stationary part of themotor.2. Rotor - It is the rotating part of themotor.
  4. 4. Stator StampingToothSlots
  5. 5. COREWINDINGSSLOTS
  6. 6. Stator has three main parts: Outer Frame – It is the outer body of theof the motor.It protects the inner part of the machine. Stator Core – Built up of high gradesilicon steel.Carries the alternating magnetic field. Stator winding – Has a three phasewinding.
  7. 7.  There are two types of rotors which areemployed in 3 – phase induction motor. Squirrel Cage Rotor. Phase Wound/ Slip Ring Rotor.
  8. 8.  It consists of a laminated cylindrical corehaving semi closed circular slots at the outerperiphery. Copper or aluminum bar conductors are placedin these slots and short circuited at each end bycopper or aluminum rings called shortcircuiting rings. The rotor winding is permanently shortcircuited and it is not possible to add anyexternal resistance.
  9. 9.  The rotor slots are not parallel to the shaft butskewed to – Reduce humming .Provide smoother torque for different positions ofrotor.Reduce magnetic locking of stator and rotor.
  10. 10.  It is also called SLIP RING ROTOR Consists of a laminated core having semi closed slotsat the outer periphery and carries a 3-phase insulatedwinding. The rotor is wound for the same number of poles asthat of stator. The three finish terminals are connected togetherforming a star point and the three star terminals areconnected to three slip rings fixed on the shaft.
  11. 11.  Principle of OperationA rotating field is set up in the stator when a 3- Phasesupply is given.The stationary rotor cut the revolving field and due toelectromagnetic induction an e.m.f. is induced in the rotorconductor.As the rotor conductor is short circuited current flowsthrough them.It becomes a current carrying conductor in magnetic fieldand start rotating.
  12. 12. SlipInduction motor rotor always rotate at a speed less thansynchronous speed.The difference between the flux (Ns) and the rotor speed (N)is called slip.% Slip = (Ns – N) 100NSlip speed = Ns – N
  13. 13. • Queries

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