Winding Terminologies

a). Conductor : It is the actual armature conductor which is under the influence of the magnetic field, placed in the armature slot. b). Turn : The two conductors placed in different slots when connected together, forms a turn. While describing armature winding the number of turns may be specified from which, the number of … Continue reading Winding Terminologies

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Types of Armature Winding

According to the way of connecting the conductors, armature winding has basically two types namely, (i). Lap winding and (ii). Wave winding Lap winding : In this case, if connection is started from conductor in slot 1 then connections overlap each other as winding proceeds, till starting point is reached again. Developed view of part … Continue reading Types of Armature Winding

Action of Commutator

It is seen that, the emf induced in the conductors is always sinusoidal converts this sinusoidal emf to unidirectional emf. For simplicity of understanding the commutator action, consider commutator in its simplest form. Commutator is divided into number of copper segments is insulated from each other. Commutator is divided into number of copper segments insulated … Continue reading Action of Commutator

Characteristics of dc motors

Torque and Speed Equations For a d.c. motor >> Torque is directly proportional to the product of Armature current and main flux. $latex \displaystyle T_a = \phi I_a \biggl ( \frac {PZ}{2\pi A} \biggr ) &s=3 &bg=ffffff$ $latex \displaystyle T \propto \phi I_a &s=3 &bg=ffffff$ Now $latex \displaystyle \phi &s=2 &bg=ffffff$ is the flux produced by the … Continue reading Characteristics of dc motors