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 from PART66Online
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.
G
gav_18s asked · 23 May 2016
Help!? I thought Interpoles in a generator are same polarity as main pole ahead of it? Behind for motors?
Community Comments (2)
A
Alekrg
19 Apr 2017
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
7 Apr 2021
Generator: ahead
Motor: behind
Motor: behind
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