Why the Rotor of Slip Ring Induction Motor always Star Connected?
You may think why the rotor of the slip ring induction motor always stars connected, what will be the problem if it is Delta connected. There are some very simple reasons which are explained in this article.
Reason
1
The
first and main important reason is Insulation problem. We know that in star
connection the phase voltage is root three times lesser than the line voltage, so
if the rotor winding is connected in delta connection the voltage across each
winding will be high, therefore more insulation arrangement is required which
is not economical.
Reason
2
If
the rotor winding is delta connected, the voltage across each winding will be
high. In this case, if we connect rheostat to reduce the voltage of the roto, a
very high current will flow because here the voltage is high. This high current
will cause sparking on slip rings and may damage the slip rings and rotor
windings. So the conclusion is to operate at low voltage star connection is
used.
Reason
3
There
is a closed loop in delta connection, so the zero sequence current will flow
through the windings which also create magnetic flux. So using the rotor
resistance starter, the induction motor may not be started from the zero speed.
After giving the power supply, the induction motor will be started even without
the rotor resistance starter.
Reason
4
To
connect the rotor winding in Delta connection, all the six terminals should be
brought out outside. This is only possible by using six slip rings instead of
three slip rings which are not economical and also the size of the motor will
be increased.
Reason
5
It
is easy to connect resistors with the rotor windings in star configuration than
Delta configuration.
- Why Induction Motor cannot run at Synchronous Speed | Slip Phenomenon
- Why Three Phase Induction Motor Self-Starting but Synchronous Motor not?
- Applications and Advantages of all types of Motor- DC Motors, AC motors, Universal Motors
Thank
you for visiting the website. keep visiting for more updates.
Why the Rotor of Slip Ring Induction Motor always Star Connected?
Reviewed by manoranjan das
on
8:44 am
Rating:
