Machine Lab- Identify the different parts (along with function and materials ) for the given single phase and three phase induction motor

 

 

Experiment Name: Identify the  different parts (along with function and materials ) for the given single phase and three  phase induction motor

Experiment Number: 01

Experiment Date:   

 

Aim: After the completion of this experiment students will able  to

i)                    Identify different parts of Induction Motors

ii)                   Understand the functions of different parts of induction motor

 

 

 

Theory:

 

Induction Motor: An induction motor is an electric machine which (stator) receives electric energy from supply and produces mechanical energy in its rotor by the help of electromagnetic induction. Hence the name.

So it is a single excited ac motor .

 It consists of

a)       Frame or encloser

b)      Stator

c)       Rotor and

d)      Shaft and Ball bearing

Encloser: It is the frame i.e. outer part of induction motor made of cast iron. It provides  housing to inner part of others  and provides mechanical strength.

 

Stator: Stator is the stationary parts of Induction motor. It consists of stator core made of  high grade alloy steel (laminated   silicon silicon)and stator winding made of copper winding.

Parts of stator:

è Stator core-

è Stator winding-

 

 

 

 

 

 

 

 

 

 

 

Rotor of Induction motor:

There are two types of induction motor according to rotor construction.

i)                    Squirrel cage induction motor

ii)                   Slip ring or wound rotor induction motor.

 

Squirrel cage Induction Motor:

It consists of cylindrical laminated core with slots nearly parallel to the shaft axis. It consists of cylindrical copper or aluminium bar form a squirrel cage. The ends of rotor are short circuited as the same material of bar. So it has no separate winding in its rotor as stator.

 

Parts of Rotor:  

è Rotor Core-

è Rotor winding-

 

Circuit of Image of Rotor:

 

 

 

 

 

SLIP RING OR WOUND ROTOR INDUCTION MOTOR:

Slip ring induction motor consists of  three phase  winding as stator winding made of copper and rotor core made of high grade allay steel ( laminated silicon steel). Three slip rings are mounted on the shaft with brush resting them.

 

Parts of Rotor:

è Rotor Core-

è Rotor winding-

è Slip Rings

è Brush

 

Circuit or Image of Slip ring Induction Motor:

 

 

 

 

 

 

 

 

 

Shaft: it is the central part of motor on which rotor is mounted made of mild steel. It supports the rotor , ball bearing and Slip ring

Ball bearing: It is placed on shaft helps to rotate the rotor made of high grade alloy (carbon) steel.

 

 

Specifications:

Write    According to Name plate

 

 

Conclusion:

 

 

 

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 Extra notes

 

PARTS	material	FUNCTION
Stator frame	Case iron	Supports the core,protects inner-parts.
Stator core	Silicon steel	Houses stator winding.
Stator Winding	Copper and insulated	Product rotating magnetic field.
Rotor core	Silicon steel	Houses rotor winding.
Rotor winding	Copper and insulated	To produce rotor current.
Air gap	–	To provide rotor and stator.
Air inlet-outlet	–	For air circulation.
Cooling fan	Aluminium	For air circulation.
Slip-rings	Phosphorus Bronze	Connects resistance to rotor circuit via-brushes.
Brushes	Carbon	To provide connection between resistance and slip-rings.
Shaft	M.S	Supports rotor.