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Three phase induction motor

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Construction and working of three phase induction motor is explained

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Three phase induction motor

  1. 1. Three Phase Induction Motor
  2. 2. •Three phase induction motors are very popular, because of their simple, robust construction and high reliability. CONSTRUCTION •It consist of mainly two parts- Stator and Rotor
  3. 3. Stator- Outer Part is called as frame whereas inner part of it is called as stator core. The core is made up of number of stampings, in which different slots are cut to receive three phase winding, which is connected to three phase AC supply.
  4. 4. • Three phase windings are arranged in such a manner in the slots that they produces rotating magnetic field after AC supply is given to them.
  5. 5. • The windings are wound for a different number of poles, depending upon the speed requirement. • Speed is inversely proportional to number of poles, given by the formula NS =120f/P Where, NS = Synchronous speed, f= frequency, and P= number of poles.
  6. 6. Rotor- It consist of cylindrical laminated core with parallel slots that carry “Conductor Bars”.
  7. 7. Conductors: Are heavy copper or aluminum bars which fit in each slot.
  8. 8. These conductor are brushed to the short circuiting and ring
  9. 9. • The slots are not exactly made parallel to the axis of the shaft but are slotted a little skewed for the following reason- • They reduce magnetic hum or noise. • They avoid stalling of motor.
  10. 10. Working • When three phase supply is given to the motor, the resulting current generate a magnetic flux ф. • Due to the switching sequence of three phase current in R Y B phases, The generated flux rotates around the “rotor conductor.”
  11. 11. • According to the faraday’s law which state that “ An EMF get induces in a conductor when a changing magnetic filed link through it. Here as you can see, two conductors are facing rotating magnetic filed produced by the stator winding.
  12. 12. • EMF is induced in the copper bar and due to this current flows in the rotor. • The direction of current can be given by “lenz law” which state that the direction of induced current will be in opposite of the motion causing it.
  13. 13. • Here the relative velocity between the rotating flux and static rotor conductor is a cause of current generation. • Hence the rotor will rotate in same direction to reduce the cause i.e. relative velocity thus rotating the rotor of induction motor. • Therefore in this process poles are induces on the surface of the rotor and these poles always try to catch opposite poles which are rotating on the stator periphery. • Thus rotor rotates in the direction of rotating magnetic flux.
  14. 14. • Rotor poles always try to catch the rotating poles on the stator frame but they can not achieve the same speed because if rotor is able to rotate at same speed their will be no relative motion between the stator poles and rotor poles and hence there is no change in flux experience by the rotor. • In this case EMF induced on the rotor conductors will be zero. • Therefore rotor always rotate in less speed than the speed of the rotating flux. • This process continues until the supply is given to the stator winding. • IN THIS WAY INDUCTION MOTOR WORKS
  15. 15. Thank You
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Construction and working of three phase induction motor is explained

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