REV.-A
Carriage Motor Excitation System
The carriage motor is controlled by the carriage motor constant current drive circuit. The phases of
the carriage motor are controlled by
CRA
-
CRD
of the gate array
(IC3A:
E05A 15GA). Two drive systems,
2-2 phase and 1-2 phase excitation, are used. Because the carriage motor has one driving transistor
per winding
(unipolar drive), two drivers become active in the 2-2 phase excitation system and one and
two drivers become active alternately in the 1-2 phase excitation system. Figure 2-37 shows the carriage
motor drive sequences.
“c
ON
1
I
i
OFF
I
I
1
I
OD “
N
1.
1
I
I
OFF
I
1
I
s+-
~
123
415 6 7 8
1
Rotat ion
C.c.
w
~
C.w
(Carriage moves left to right.
I
(a) 2-2 Phase Excitation
(ICIA )
0
’
:: -
I
c)’
ON
OFF
I
“c
ON
1
I
I
“FF
I
I
“D ‘
N
I
I
I
I
OFF
I
I
step
~
1234567
811
Rotat
Ion
C.c.
w
~
C.w
(Carriage moves left to right. )
(b) 1-2 Phase Excitation
Figure 2-37. Carriage Motor Drive Sequence
2-45
To Next Page
Loading...
