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DC MACHINES 15/11/2016
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DC MACHINES Stator Field system; brushes Rotor Armature & commutator
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IMAGES -
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Types Separately excited Self excited Shunt Series Compound Long shunt
Cumulative Differential Short shunt
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IMAGES – Sectional view
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Starters
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WINDING DIAGRAM - LAP
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WINDING DIAGRAM – LAP…
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WINDING DIAGRAM - WAVE
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WINDING DIAGRAM – WAVE…
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ARMATURE REACTION
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ARMATURE REACTION…
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ARMATURE REACTION…
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ARMATURE REACTION…
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ARMATURE REACTION…
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COMMUTATION
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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
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COMMUTATION… I 2I=Ia 1 2 3 4 2I I-Ic 2I-Ic Ic
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Factors Affecting Commutation
Resistance of Copper Carbon contacts Resistance of coil being commutation emf induced in short circuited coil
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