what are slot wedges in a DC machine made of?

Electrical Engineering DC Machine I Dr Settar S Keream Why does insulation occupy a larger fraction of the slot cross -sectional area in smaller

using metallic fixing wedges; b making the teeth thin :The following data is given for the armature of a dc machine :conductors slot layer =6;

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slot oasis Magnetic slot wedges are often used to improve starting performance of large induction motors The effects of the wedges on the performance