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(3)
(3) If the c
If the condit
ondition is no
between the brush and commutator.
between the brush and
(4) Poli
(4)
Polish the b
sh the brush s
rotating commutator.
rotating commutator.
(5) Che
(5)
Check th
ck the thi
e thickn
(6) Blow t
(6)
Blow the dus
he dust out wi
parts.
parts.
T T o o o o l l n n a a m m e e
S S a a n n d d p p a a p p e e r r
CHAPTER 3 MOTOR
CHAPTER 3 MOTOR
17. . Tr Trou
17
oubl bles esho
S S y y m m p p t t o o m m
Motor does not start.
Motor does not start.
Motor starts but does not
Motor starts but does not
run at rated speed.
run at rated speed.
Motor produces
Motor produces
Abnormal vibrations and
Abnormal vibrations and
noise.
noise.
Bearing overheats.
Bearing overheats.
ion is not good
t good, inser
, insert a sand pa
t a sand paper [
commutator.
rush surfa
urface by m
ce by moving
oving a sand
a sand paper
ckness o
ess of bru
f brush.
sh.
t out with com
th compress
pressed air
ed air and cle
and clean the
N N u u m m b b e e r r
# # 4 4 0 0 0 0
hoot otin ing g
Low supply voltage
Low supply voltage
B B l l o o w w n n f f u u s s e e
E E x x c c e e s s s s l l o o a a d d
F F a a u u l l t t y y w w i i r r e e c c o o n n n n e e c c t t i i o o n n
B B r r o o k k e e n n w w i i r r e e i i n n c c o o n n t t r r o o l l d d e e v v i i c c e e
B B r r o o k k e e n n w w i i r r e e i i n n f f i i e e l l d d d d e e v v i i c c e e
B B r r o o k k e e n n w w i i r r e e i i n n a a r r m m a a t t u u r r e e c c o o i i l l
Low supply voltage
Low supply voltage
F F a a u u l l t t y y c c o o n n n n e e c c t t i i o o n n o o f f a a r r m m a a t t u u r r e e c c i i r r c c u u i i t t
D D e e f f e e c c t t i i v v e e b b e e a a r r i i n n g g s s
L L o o o o s s e e m m o o u u n n t t i i n n g g b b o o l l t t s s
C C o o n n t t a a c c t t b b e e t t w w e e e e n n a a r r m m a a t t u u r r e e a a n n d d f f i i e e l l d d c c o o i i l l
I I n n c c o o r r r r e e c c t t i i n n s s t t a a l l l l a a t t i i o o n n
Severe external vibration
Severe external vibration
D D e e f f e e c c t t i i v v e e b b e e a a r r i i n n g g s s
O O i i l d
l de e g g r r a a d d a a t t i i o o n o
n or r s s h h o o r r t t a a g g e i e in b
1. 1. Br Brus ush h
2. 2. Com
Commut
mutato
ator r
per [#400]
#400]
paper or or
3
3
an the
1. 1. Br Brus ush h
2. 2. San
Sand pa
d paper
per
P P o o s s s s i i b b l l e e c c a a u u s s e e s s
n be e a a r r i i n n g g s s
1) 1) Go
Good
od
2) 2) Not
Not goo
good d
1
1
3. 3. Com
Commut
mutato
ator r
S S o o l l u u t t i i o o n n
Charge battery and improve power supply
Charge battery and improve power supply
condition.
condition.
R R e e p p l l a a c c e e . .
R R e e d d u u c c e e l l o o a a d d . .
R R e e p p a a i i r r , , o o r r r r e e - - t t i i g g h h t t e e n n w w i i r r e e c c o o n n n n e e c c t t i i o o n n s s . .
R R e e p p a a i i r r o o r r r r e e p p l l a a c c e e . .
R R e e p p a a i i r r o o r r r r e e p p l l a a c c e e . .
R R e e p p a a i i r r o o r r r r e e p p l l a a c c e e . .
Charge battery and improve power supply
Charge battery and improve power supply
condition.
condition.
R R e e p p a a i i r r c c o o n n n n e e c c t t i i o o n n s s . .
R R e e p p l l a a c c e e b b e e a a r r i i n n g g s s . .
R R e e t t i i g g h h t t e e n n b b o o l l t t s s a a n n d d n n u u t t s s . .
R R e e p p a a i i r r o o r r r r e e p p l l a a c c e e . .
C C o o r r r r e e c c t t i i n n s s t t a a l l l l a a t t i i o o n n c c o o n n d d i i t t i i o o n n . .
Remove the cause of vibration, or take
Remove the cause of vibration, or take
appropriate vibration-insulating measures.
appropriate vibration-insulating measures.
R R e e p p l l a a c c e e . .
R R e e p p l l a a c c e e . .
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