Basic Electrical and Electronics Engineering: Unit II: Electrical Machines
Construction of Three Phase Induction Motors
The induction motor consists of two main parts (i) Stator (ii) Rotor
CONSTRUCTION OF THREE
PHASE INDUCTION MOTORS
The
induction motor consists of two main parts (i) Stator (ii) Rotor
Stator
The
stator is made up of a number of stampings with alternate slot and tooth.
Stampings are insulated from each other. Each stamping is 0.4 to 0.5 mm thick.
Number of stampings are stamped together to build the stator core. The stator
core is then fitted in a casted or fabricated steel frame. The slots house the
three phase winding called stator winding.
It
may be connected either in star or delta. The stator winding is made for a fixed
no of poles. Fig.3.85 shows the stator lamination.
Rotor
Two
types of rotor are
i)
Squirrel cage rotor
ii)
Slip ring or wound rotor
i)
Squirrel cage rotor
Fig.3.86
shows a squirrel cage rotor. This is made up of a cylindrical laminated core
with slots to carry the rotor conductors.
The
rotor conductors are heavy bars of copper or aluminum short circuited at both
ends by end rings. Hence this rotor is called short circuited rotor. The entire
rotor resistance is very small. External resistance cannot be connected in the
rotor circuit such motors are extremely rugged in construction.
ii)
Slip ring or wound rotor
Fig.
3.87 shows a slip ring or wound rotor. In this of rotor windings are similar to
the stator winding. The rotor winding may be star of delta connected,
distributed winding, wound for as many number of poles as the stator. The three
phases are brought out and connected to slip rings mound on the rotor shaft.
Variable external resistance can be connected in the rotor circuit with the
help of blushes and slip rings arrangements. By varying the external resistance
in the rotor circuit, the motor speed and torque can be controlled.
Basic Electrical and Electronics Engineering: Unit II: Electrical Machines : Tag: : - Construction of Three Phase Induction Motors
Basic Electrical and Electronics Engineering: Unit II: Electrical Machines
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