What polarity do interpoles take in a DC generator?
- The same as the next main pole behind in the direction of rotation.
- Either, providing they lay on M.N.A.
- The same as the next main pole ahead in the direction of rotation.
Explanation
Interpoles (commutating poles) in a DC generator are wound to take the same polarity as the next main pole ahead in the direction of armature rotation. This cancels armature reaction and aids commutation in the brush zone, which would not be achieved by matching the pole behind.
gav_18s asking:
Help!? I thought Interpoles in a generator are same polarity as main pole ahead of it? Behind for motors?
Community Comments (2)
A
Alekrg Posts: 4 19.04.2017 / 15:37
I agree with you. This answer is wrong. Since in generators the MNA rotates in the direction of armature rotation interpoles polarity should be the same as the next main pole AHEAD in the direction of rotation! Please check this
M
marcotoia Posts: 2 07.04.2021 / 11:43
Generator: ahead
Motor: behind
Motor: behind
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