Basic Parts of a Three Phase (3-Փ) Squirrel Cage Induction Motor

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The diagram below shows all the basic parts that makes up an AC induction motor. These basic parts work together to ensure the smooth performance of this highly efficient electrical device:
Parts of a three-phase Induction Motor - Photo Credit: WEG MOTORS

Stator Parts
As shown in the diagram above, the parts 1, 2 and 8 makes up the stator of the three-phase Induction motor:
1 – Motor Frame. This is the supporting structure of the motor assembly; manufactured        
     of  iron, steel, die-cast Aluminium, resistant to corrosion and with cooling fins.
2 – Lamination Core. This part is constructed with magnetic steel plates and houses the 
     motor windings.
8 – Three - phase Windings. This comprises three equal sets of coils, one se set for each 
     phase, forming a balanced three-phase system when connected to a three-phase        
     power supply.

Rotor Parts
The rotor of a three-phase squirrel cage Induction motor consists of a set of non-insulated bars that are interconnected by short-circuit rings. What characterizes an induction motor is the fact that only the stator is connected to the power supply. The rotor is not power supplied externally and the currents that flow through it are induced electromagnetically by the stator from which comes the induction motor name.

The parts 3, 7 and 12 makes up the rotor of the three-phase motor:
7 – Shaft. It transmits the mechanical output developed by the motor.
3 – Laminated Magnetic Core. The rotor laminations have the same characteristics of the       
     stator laminations.
12 – Rotor Bars and Short Circuit Rings. These are Aluminium die castings formed as one 
       piece. They enable the rotation of the motor through induction of electromagnetic 

Other Parts of The Motor
Below are listed other critical parts of the three-phase squirrel cage induction motor:
4 – End Shields
5 – Fan for cooling motor
6 – Fan Cover.
9 – Terminal Box. This houses the electrical terminals of the motor.
10 – Motor terminals
11 – Bearings. These support the rotation of the rotor.

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