Reactive sparking is reduced by
- interpoles.
- compensating windings.
- auxiliary windings.
Explanation
Reactive (commutation) sparking arises from the self-inductance of the coil being commutated, which tries to maintain current as it reverses. Interpoles induce a reversing EMF in that coil at the right instant, cancelling the reactive voltage and so reducing sparking at the brushes.
iskandarazli asking:
why interpoles?
Community Comments (2)
D
dimky Posts: 514 22.02.2012 / 21:52
Interpoles 'reduce' armature reaction (which causes reactive sparking). Compensating windings 'prevent' armature reaction.
E
emwamwaja Posts: 4 19.02.2021 / 16:01
Interpoles alone cannot entirely eliminate reactance sparking they only "REDUCE" it. To provide assist to interpoles, COMPENSATOR WINDINGS are introduced hence eliminating reactive sparking.
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