DC MACHINES 15/11/2016.

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Presentation transcript:

DC MACHINES 15/11/2016

DC MACHINES Stator Field system; brushes Rotor Armature & commutator

IMAGES -

Types Separately excited Self excited Shunt Series Compound Long shunt Cumulative Differential Short shunt

IMAGES – Sectional view

Starters

WINDING DIAGRAM - LAP

WINDING DIAGRAM – LAP…

WINDING DIAGRAM - WAVE

WINDING DIAGRAM – WAVE…

ARMATURE REACTION

ARMATURE REACTION…

ARMATURE REACTION…

ARMATURE REACTION…

ARMATURE REACTION…

COMMUTATION

COMMUTATION… 1 3 5 7 9 11 13 15 17 19 21 23 25 27 2 4 6 8 10 12 14 16 18 20 22 24 26 28 1 3 5 7 9 11 13 15 17 19 21 23 25 27 2 4 6 8 10 12 14 16 18 20 22 24 26 28 1 2 3 4

COMMUTATION… I 2I=Ia 1 2 3 4 2I I-Ic 2I-Ic Ic

Factors Affecting Commutation Resistance of Copper Carbon contacts Resistance of coil being commutation emf induced in short circuited coil

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