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motor brushes

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picclock:
It may be that the armature has a fault, such that when the brushes contact a faulty shorted winding the excess current flow causes the brushes to heat and disintegrate.
I have used carbon rods from a U2 battery to make temporary brushes for a hoover, and they lasted quite a few months before I got around to replacing them with the proper spares. So even the wrong carbon should last a reasonable time.

Best Regards

picclock

Doc:
One other thing that could happen is the insulator material between the com. plates should be below if they are flush or slightly above they can cause the brushes to arc and fail after just a short time.

Arnak:
Hi,

Carbon Brushes are made specifically for the motor that they are being used in and come in different degrees of hardness.

Carbon brush grades are only designed to carry a specific current.  If you increase the current density then you increase the temperature at which the carbon brushes operate.  If your current density is too low then you get rapid brush wear.  Taken to extreme, this can mean that your brushes could either dust or wear out in days.

So cheap, incorrect brushes can wear out or damage the commutator if they are too hard.

Make sure you buy from the motor manufacturer or a known brand equivalent.

Martin

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