Why DC motors have open slots?

Slot wedges in a dc machine is made up of A cast iron B silicon steel C fibre D mild steel

it was an economically produced item with no longevity built into it when it was manufactured Note the lack of slot wedges and slot insulation

slot canyon lake powell The function of a Commutator is to invert DC input wave to an AC wave in the armature winding It is built up of a number of small wedge shaped segments of high

slot ace 777 8 What are slot wedges in a DC machine made of? A Mild steel B Silicon steel C Fibre D