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Induction Motor Essay

909 Words4 Pages

An induction motor has two main parts; a stator and a rotor. The stator is the stationary part and the rotor is the rotating part of the induction motor. Rotor is connected to the mechanical load through the shaft and it sits inside the stator.
It rotates due to torque produced by electric current; obtained by electromagnetic induction from the magnetic field of stator winding. Thus an induction motor has no electrical connection with the rotor.
Early development
Galileo Ferraris described an induction machine with a solid copper cylindrical armature and two-phase stator winding in 1885. In 1888, Nikola Tesla received a patent on a two-phase induction motor having two-phase stator winding and a short circuited copper rotor winding.
During this time, working on …show more content…

Squirrel-cage rotor
(b). Wound rotor or Slip ring rotor
Construction
Squirrel-Cage Rotor
Squirrel cage rotor comprises of laminated steel in the core with parallel slots on its periphery for carrying evenly spaced bars of copper or aluminum placed axially, and permanently shorted at the ends by the end rings on both sides of the rotor forming a cage-like shape.
The bars are skewed to prevent magnetic hum and magnetic locking of rotor and stator teeth (cogging) and the working of the motor is more smooth and quiet. Also skewing increases slip for a given torque.
As the rotor stays inside the stator, its number of slots should be smaller than that of stator and must be a non-integer multiple of stator slots thus preventing magnetic interlocking of rotor and stator teeth at the starting instant.
The rotor resistance is quite small but it is not possible to add external resistance as the bars are permanently shorted. Since the voltage devolved in squirrel cage winding is low, no intentional insulation layer is placed between the rotor steel and bars. Its design is very rugged and robust due to absence of slip ring and brushes.
Wound

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