Question
Download Solution PDFIn a DC generator, brushes are made of _______.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFBrushes in DC machine:
- Brushes are used to collect the current due to the induced emf from the armature coils in a DC generator
- Brushes are made up of Carbon and graphite to reduce the wear and tear of the commutator
- When a brush is at any particular segment, it shorts out that particular coil and draws current from the rest of the coils
- If emf induce in that coil, the huge current will flow
- To prevent this, brushes are positioned in such a way that the coil being short-circuited has no emf in it to prevent heat loss in the brushes and sparking at commutator segments
- Hence brushes placed along the magnetic neutral axis
Last updated on Jul 1, 2025
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