6.3 Maintenance and repair of traction motor
Common faults and causes of DC motor:
·Befor charging,it is necessary to confirm that there is no no dust,water
and other foreign matters in the charging gun and charging soket,If there are
foreign matters,it is necessary to clean them up before charging, otherwise it
will lead to poor
1.The motor of the vehicle can work normally within the nominal
working voltage range of the battery pack.
2.The motor is not allowed to idle, and the terminals cannot be short-
circuited externally.
3. The air should not contain explosive gas.
4. Frequently remove the sediment and other adhesions on the motor shell
so as not to affect the heat dissipation.
5. Check the carbon brushes of DC system motors every three months,
and replace the severely worn carbon brushes and invalid carbon brush
compression springs in time. AC system motors are maintenance-free.
Short circuit between commutator
segment or armature coil, poor
welding or open circuit between
commutator segment and armature coil
S/N
1
2
3
4
Fault
All copper sheets are
blackened
Brushes are worn,
discolored and broken
The motor vibrates;the gap between
brush and brush box is too large;the
distance between brush box and
commutator working surface is too
large;the mica is protruding between
upper commutator segments;the brush
material is poor;the brush grade is wrong
Commutator segments
are blackened and there
is no certain rule
Commutator segments
are blackened in sets in
certain order
Incorrect brush pressure
Cause
The commutator center line is
displaced,and the commutator surface
is not round or even
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