troubleshooting chart for dc electrical machines

[gjo]

On the chart it says commutator sparking of brushes that a probable causr would be commutationwindings defective. What does commutation windings defective mean?

 

[tpetar]

On the chart it says commutator sparking of brushes that a probable causr would be commutationwindings defective. What does commutation windings defective mean?

Commutator (electric)
https://en.wikipedia.org/wiki/Commutator_(electric)


Commutator pictures:

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Bad commutator pictures:

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Best regards,
Peter

 

[chuckey]

if a winding goes short circuit in the armature, every time its connected to the brushes the current it takes is very high, so two opposite segments will over heat and become black and rough.
Frank