Electrical Output power in Train for Light and Fan (Belt Driven Generator)

Method of Obtaining Constant Electrical Output power in Train

• The most important requirement of train lighting is to obtain constant output irrespective of locomotive speed.
• To achieve this there are three methods of obtaining constant output. They are as follows :

1. Belt Driven Generator
2. Three Brush Generator
3. Rosenberg Generator

1. Belt Driven Generator :

• In this case the generator is driven with the help of belt from wheel axle pulley.
• If the output of the generator increases due to increase in speed, the drag on the armature increases which further result in the increase in the belt tension.
• The adjusting screw is the important part, which helps in connecting the generator with the wheel at any speed. The Figure shows the complete arrangement of the system.

2. Three Brush Generator
3. Rosenberg Generator