A star delta starter is the most commonly used method for
the starting of a 3 phase induction motor. In star delta
starting an induction motor is connected in through a star
connection throughout the starting period. we use it to
reduce the starting current of the motor without using any
external device or apparatus.
what is star delta control circuit
controlling the interchanging star connection and delta connection
of an AC induction motor is achieved by means of a star delta or
wye delta control circuit. The control circuit consists of push
button switches auxiliary contacts and a timer.
difference between DOL and star delta starter
dol means the motor is connected directly on line using one contactor
with no starting circuit to lower the high starting current. typically
the Delta part of Star-Delta. Star-Delta uses two contactors one to start
at a lower voltage in Star and one to run at a higher voltage in Delta
configuration.
3 phase induction motor
The three phase induction motor is an alternating current motor
which is driven by the electromagnetic torque generated by the
interaction between the rotating magnetic field formed by the
stator winding and the magnetic field of the induced current
in the rotor winding. it belongs to a kind of induction motor.
why magnetic contactor is used
Magnetic contactors are used in the electric motors
to balance the change in frequency of the motor or
the state of the motor which can be termed as the
switching of the motor from on and off state.
magnetic contactors act as a safeguard to protect
the power supply and the motor.

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