Sparking on the commutator is a typical problem with DC motors and commutator machines. A small spark is acceptable, but strongsparking of the commutator destroys both the brushes and the commutator itself. Let's look at the reasons and solutions.
Why the commutator sparks
- Wear of the brushes.Short or loose brushes lose contact.
- Contamination of the commutator with coal dust, oiling.
- Wear and runout of the commutator - uneven surface.
- Inter-lamella short circuitor protruding insulation between the lamellas.
- Weakening of the springsbrush holders - insufficient pressure.
- Breakage or short circuit in the armature winding.
What is dangerous about sparking
Strong sparking causes scorching of the lamellas, accelerated wear brushes and ultimately a “all-round fire” - an accident with the entire collector shutting down. Therefore, the problem must be eliminated at the first signs.
How to eliminate
| Cause | Solution |
|---|---|
| Brush wear | Replacement, grinding in the commutator |
| Contamination | Cleaning collector |
| Beating, wearing out | Grooving and grinding of the collector |
| Protruding insulation | Tracking the inter-lamella spaces |
| Breakage of the armature | Rewinding of the armature |
If the surface the collector is exhausted, grooving and re-growing helps. If the armature winding is damaged, it needs to be rewinding. A complete assessment of the condition is provided by diagnostics of the brush-collector assembly.
Does the engine manifold spark a lot? Elektromotors engineers in Tashkent will restore the commutator and brush assembly with a guarantee - contact us.