Answer / angshuman gogoi

The purpose of using a 3-point dc starter in a dc machine
is to limit the starting current in the dc circuit.The
starter acts as a resistence in series with the dc circuit
to limit the starting current to the circuit at the
begining & thus acts as a initial protection between dc
rectifier and dc circuit.

Answer / amulyareddy

To reduce the back emf also we will use the starter

where multistage pump used

2 Answers  

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