17
DO NOT REMOVE THE YELLOW WARRANTY LABEL, THIS WILL VOID THE WARRANTY.
Maintenance of the Traction DC Motor
1)
For DC motors, the carbon brush should be checked every 6 months to see if there has been any
excessive wear. If it is not replaced in time before it is worn out, it will damage the motor badly.
2)
Removal of mud, sand and other clinging objects shall be done frequently to facilitate the
heat-radiation.
3)
Periodically use low pressure air to remove the dust from the carbon brush and the commutator.
Periodically check the connections of the carbon brush and the commutator.
Main malfunction and possible reason of DC motor
Item
Symptoms
Possible Causes
1
All copper plates turn black.
The pressure of brush is incorrect.
2
The commutating copper
turns black in a certain order
and in groups.
Short circuit happens between the commutating copper or among
the armature coil; poor welding or disconnection happens between
the commutating copper and the armature coil.
3
The commutating copper
turns black.
The central line of the commutator deviates or its surface is not
round and not smooth.
4
The
brush
wears
out,
changes colors and breaks.
The motor vibrates; the clearance between the brush and its holder
is too big; the clearance between the brush and commutator is too
big; the mica between the different commentators extrudes; the
brush is made from the wrong materials; the brush type is wrong.
5
Sparking From Motor
The motor is over-loaded; the commutator is not clean, not round
or not smooth; mica or some commutator extrude; the brush is not
grounded properly; the brush is big in pressure; the brush is not the
right type; the brush is jammed in the brush holder; the brush
holder became loose or is vibrating; the polarity and sequence of
magnetic poles is wrong.
6
The brush and its wires get
hot.
Big sparks from the brush; poor contact between brush and soft
wires; small section area of soft wires.
7
The brush is noisy
The surface of the commutator is not smooth.
Caution:
Only a Qualified Electrician Can Change And Adjust The Carbon Brush And Commutator.
Maintenance of the Traction AC Motor
Содержание Bubble Car
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