closeup of electric dc motor rotor with copper winding fixed by blue epoxy in black plastic housing

electric motor rotor commutator engine carbon closeup electromotor electrical machine inside coil spring brush contact industrial detail copper winding industry rotary switch power direct current magnetic field cylindrical electro electronic energy component mechanism device transformer sheet segment open plastic housing steel brass blue epoxy paste mechanical engineering electrotechnology electromechanics technology tech repair ewaste recycle green black yellow red macro 16x9 inductor stator wire induction electromagnetic equipment electricity box glue metal electrotechnics service fixed contacts pressed cylindric springs