because starting torque is high and without any load, speed becomes infinite.
dc series motor is used for traction...
what are the advanced applications of dc series motor
A DC series-parallel compound motor.
A dc series motor can work on dc and ac because dc motors are totally reversible.
Series DC motor develops a very large amount of turning force called torque from standstill and can be operated by using either an AC or DC power source.
DC series motors...
Ac motor has a low starting torque so that DC series motor used in railways cause DC motor has high starting torque
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we can either use dc series motor or induction machine ,but dc supply is not easily available so we use induction motor ,
The DC series motor is a high torque motor. so that it can pull heavy loads such as traction, lifts etc., the control of speed of a DC series motor is very smooth and easy.
dc series motor used in metro train.
this is called a universal motor most non wireless hand tools have universal motors these are series dc motors with laminated poles they can tolerate ac but run better on dc