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Why are dummy coils provided in a DC generator?

Why are dummy coils provided in a DC generator? Correct Answer To provide mechanical balance to rotor

Dummy coils:

  • The wave winding is possible only with number of conductor or coils.
  • But sometimes the armature slots available in the armature winding do not meet the requirement of the winding. (It means that the available number of slots is more than the required number of conductors).
  • Some slots are kept without armature winding in that case and dummy coil or coils are employed in that slots.
  • The dummy coils are similar to other coils except their ends are cut, short and taped. They do not connect with the commutator bars.
  • The dummy coils are simply to provide mechanical balance for the armature.
  • As they do not connect with commutator bars, they do not affect the electrical characteristics of the winding.

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