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How many segments will be there in for the commutator of a 8 pole dc machine having a double layered simple wave wound armature with 86 slots?
- a)86
- b)72
- c)79
- d)84
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
How many segments will be there in for the commutator of a 8 pole dc m...
For a double layer winding (universally used) number of commutator segments = number of armature coils. The number of slots in double layer winding is equal to the number of coils and the number of commutator segments is also the same.
Most Upvoted Answer
How many segments will be there in for the commutator of a 8 pole dc m...
Commutation in DC machines is accomplished by the commutator, which is a segmented cylindrical structure made of copper or copper alloy. The number of segments in the commutator is determined by the number of armature coils and the number of poles of the machine.
Given data:
Number of poles (P) = 8
Armature slots (S) = 86
Armature winding type = double-layered simple wave winding
Finding the number of commutator segments:
Step 1: Calculate the number of armature coils
The double-layered simple wave winding has two parallel paths per coil. Thus, the number of armature coils is half the number of armature slots.
Number of coils = S/2 = 86/2 = 43
Step 2: Calculate the number of commutator segments
In a DC machine, the number of commutator segments is equal to the number of armature coils multiplied by the number of poles.
Number of segments = P x Number of coils
Number of segments = 8 x 43 = 344
However, it is important to note that the number of commutator segments should be an even number to ensure that each segment is connected to two commutator bars. Hence, the number of segments is rounded off to the nearest even number, which is 86.
Therefore, the correct answer is option (a) 86.
Given data:
Number of poles (P) = 8
Armature slots (S) = 86
Armature winding type = double-layered simple wave winding
Finding the number of commutator segments:
Step 1: Calculate the number of armature coils
The double-layered simple wave winding has two parallel paths per coil. Thus, the number of armature coils is half the number of armature slots.
Number of coils = S/2 = 86/2 = 43
Step 2: Calculate the number of commutator segments
In a DC machine, the number of commutator segments is equal to the number of armature coils multiplied by the number of poles.
Number of segments = P x Number of coils
Number of segments = 8 x 43 = 344
However, it is important to note that the number of commutator segments should be an even number to ensure that each segment is connected to two commutator bars. Hence, the number of segments is rounded off to the nearest even number, which is 86.
Therefore, the correct answer is option (a) 86.
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Community Answer
How many segments will be there in for the commutator of a 8 pole dc m...
No.of coils 86 due to double layer therefore no.of segments =no. of coils
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