What is the function of a commutator electric motor ?
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Answers
Explanation:
Given expressions are : a
4
−2a
3
b+3ab
3
+4a
2
b
2
+3b
4
and −2a
4
−5ab
3
+7a
3
b−6a
2
b
2
+b
4
Required sum =(a
4
−2a
3
b+3ab
3
+4a
2
b
2
+3b
4
)+(−2a
4
−5ab
3
+7a
3
b−6a
2
b
2
+b
4
)
=a
4
−2a
3
b+3ab
3
+4a
2
b
2
+3b
4
−2a
4
−5ab
3
+7a
3
b−6a
2
b
2
+b
4
Rearranging and collecting like terms,
=a
4
−2a
4
−2a
3
b+7a
3
b+3ab
3
−5ab
3
+4a
2
b
2
−6a
2
b
2
+3b
4
+b
4
=(1−2)a
4
+(−2+7)a
3
b+(3−5)ab
3
+(4−6)a
2
b
2
+(3+1)b
4
=−a
4
+52a
3
b−2ab
3
−2a
2
b
2
+4b
4
Answer:
The commutator on the DC generator converts the AC into pulsating DC.On DC and most AC motors the purpose of the commutator is to insure that the current flowing through the rotor windings is always in the same direction, and the proper coil on the rotor is energized in respect to the field coils.
The function of commutator or slip ring is to change the direction of current through the coil after every half rotation.