DC Motor Starter || Three- Point Starter working and Testing || Necessity of Starters

state the necessity of starter for a DC motor

• state the different types of starters - construction and working principle of 2-point, 3-point and 4-point starters.
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Types of starters: Starters used to start the DC motors

are generally of three types.

• Two-point starter

• Three-point starter

• Four-point starter
Three-point starter:
shows the internal diagram of

a three(terminal) point starter connected to a DC shunt

motor. The direct current supply is connected to the

starter, the motor circuit through a double pole switch and

suitable fuses. The starter has an insulated handle or knob

for the operator's use. By moving the starter handle from

the `off' position to the first brass contact (1) of the starter,the armature is connected across the line through the

starting resistance. Note that the armature is in series with

the total starting resistance. The shunt field, in series with

the holding coil, is also connected across the line. In this

mode of operation, the rush of the initial current to the

armature is limited by the resistance. At the same time,

the field current is at the maximum value to provide a good

starting torque.
3- Point Starter
ITI electrician Theory
ITI Theory and Practical
J. R. Sundesha

DC Motor Three - Point Starter,