main features of dc motor (input dc) Two permanent magnets on opposite sides of the motor, with opposite poles facing each other. The pole faces are curved to fit around the armature. The armature consists of a cylinder of laminated iron mounted on an axle. Often there are longitudinal grooves into which the coils are wound. rotor ---> There may be only one, in a very simple motor, or several coils, usually of several turns of insulated wire, wound onto the armature. The ends of the coils are connected to bars on the commutator. The commutator is a broad ring of metal mounted on the axle at one end of the armature, and cut into an even number of separate bars (two in a simple motor). Each opposite pair of bars is connected to one coil. and dc motors uses a split ring communtator and dc input so is dc generator (genertor which reverse the funtion of motor)(with dc output) in addition genertor can also use slip ring instead of spilt ring communtator to get ac output but it seems not right for a motor if change split ring communtator to slip ring (full ring) it would not work as a ac motor (if input is ac). is this true?