HELI CPD18 - 4.5 Lithium battery and charger; 4.5.1 Battery specification

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left during polishing.
b) After polishing brush with emery cloth and cleanup the commutator, the motor
should running with limit speed to assure safety, until the working surface of brush
polished.
(3) Working environment
a) Not higher than 1200m altitude.
b) Temperature between -25ºC ~ +40ºC.
c) Relative humidity large to 100%, form curding dew at surface of motor.
(4) Faults and troubleshoot
The faults of DC motor mostly focus on the commutator department, characteristic
and causation as the following table.
Table 4-3 Faults and troubleshoot of motor
No.
Commutator fault
Causation
1
All sheet copper is black.
Wrong press of brush.
2
The commutating piece change black in
group with regulation.
Between commutating piece or armature winding
short, welding bad or the commutating piece and
armature winding bad or turn off.
3
The commutating piece change black in
group without regulation.
The center of commutator moved, and the surface
of commutator is not circle or flat.
4
The brush is frayed, change color and
disintegrated.
The motor vibrate, the space between brush
holder and brush is too big, the space between
brush holder and the surface of commutator is too
big. The talc between the commutating piece
extruded, the material or type of brush is wrong.
5
The sparkle of commutator is big.
Motor over loading, the commutator is not clean,
the brush contact is bad, the press is not enough
or the brush is locked, brush rack become flexible
or vibrate, wrong the polarity of pole and
sequence.
6
Brush and brush plait heat.
The sparkle of brush is big, the contact between
brush and soft wire is bad, the section area of soft
wire is too small.
7
noise during the brush running.
The surface of commutator is not enough smooth.
Notice: In case of backfire, one must shut off the power when checking and
maintaining the motor.
4.5 Lithium battery and charger
4.5.1 Battery specification