5.4 Failure diagnosis of DC motor
All copper pieces are
black
·The pressure of electric brush is incorrect.
The commutator pieces
are black with the regular
order.
·Commutator pieces are short circuit.
·Armature coil is short circuit.
·The commutator pieces and armature coil are faulty
welding or break in the circuit.
The commutator pieces
are black, but nothing
regular.
·The middle line of commutator is out of position.
·The surface of commutator is not plat or round.
The electric brush is
damaged, discolored or
burst.
·The motor vibrates.
·The clearance between the electric brush and the
brush box is too large.
·The distance between brush box and commutator
surface is too large.
·The mica between commutator sheets sticks out.
·The electric brush materials isn’t fitting.
·The trademark of electric brush is not correct.
·The motor is over capacity.
·The commutator is not clean.
·The commutator is not plat or round.
·Mica sheets or some commutator pieces stick out.
·The electric brush is badly grinded.
·The pressure of electric brush is not large enough.
·The trademark of electric brush is not correct.
·The electric brush is blocked in the brush box.
·The brush holder is loose or vibrated.
·The magnetic polarity and order is improper.
Electric brush and brush
wire gets very hot.
·The spark of the electric brush is too great.
·The electric brush and soft wire are contacted poorly.
·The area of the soft wire coil is too small.
The electric brush makes
abnormal noise.
·The surface of commutator is not plat.
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