DC motor commutation is poor, the possible reasons are:
The commutator surface is in poor condition.
The commutator is not round.
The load is too large.
Brush vibration.
The brush spring pressure is too small.
The brush number is not suitable.
The commutator is shorted between the pieces.
The armature and the headgear are welded.
Compensation and commutation pole winding short circuit.
Compensation and commutation pole winding wiring error.
The brush distance is not uniform.
The brush is not on the neutral line.
The motor vibrates.
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