D.C. Motor Characteristics
The performance of a d.c. motor under various conditions can be judged by the following characteristics i) Torque – Armature current characteristics…
Shunt Generator
When the field winding is connected in parallel with the armature and the combination across the load then the generator is called…
Separately Excited Generator
When the field winding is supplied from external, separate d.c. supply i.e. excitation of field winding is separate then the generator is…
Practical Commutation
The e.m.f. induced in each coil of armature is alternating in nature. If load is connected, the current flowing will also be…
Symbolic Representation Of D.C. Generator
The armature is denoted by a circle with two brushes. Mechanically it is connected to another device called prime mover. The two…
Introduction To Armature Reaction
For the operation of any d.c. machine, presence of magnetic flux is essential. Whenever current flows through a field coil, it produces…
Characteristics Of D.C. Generators
The d.c. generators have following characteristics in general, 1) Magnetization characteristics 2) Load characteristics 1.1 Magnetization Characteristics This characteristics is the graph…
Methods Of Excitation
The magnetic field required for the operation of a d.c. generator is produced by an electromagnet. This electromagnet carries a field winding…
Compound Generator
In this type, the part of the field winding is connected in parallel with armature and part in series with the armature.…
Armature Winding In D.C. Machines
The armature winding used in d.c. machines are closed and double layer. Each of the coil has its upper coil side placed…