Note: The adjustment and replacement of motor carbon brushes and
the trimming of motor commutators need to be operated by professionals.
Common faults and causes of AC motor:
S/N Fault
Cause
1 Abnormal noise of motor
Motor bearing damage
6.4 Maintenance and repair of electroni c control gear
The electronic control gear used in the vehicle is an original imported
product, and high-frequency MOS technology is adopted to realize smooth,
silent, efficient and energy-saving vehicle speed, torque and brake control.
To prevent runaway upon starting, when the vehicle starts, if the
controller detects that the pedal input signal is greater than 20%, it will
trigger the controller protection fun
ction (HPD) and the
controller will
prohibit the output.
The microprocessor is powered on for self-inspection and subject to
continuous diagnosis during operation. In case of any fault, the controller
will stop output immediately, thus protecting the operator and the vehicle
5 Big spark
6
Brushes and brush
discrimination lines are
heated
7 Brushes have noise The commutator surface is not smooth
The brush spark is large,the contact
between the brush and the soft wire is
poor,and the cross-sectional area of the
soft wier is too small
The motor is overloaded;the commutator
is unclean;the commutator is not smooth
or round;the mica plate or part of
commutator segment is protruding;the
brush grinding is not good;the brush
pressure is not high enough;the brush
grade is wrong;the brush is stuck in the
brush box; the brush holder is loose or
vibrates;the polarity and arrangement
sequence of magnetic poles are incorrect.
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General