Samsung SH09AS2 - Page 75

74 | SAMSUNG
DIAGRAM
7
7-3-2. Stepping Motor Control
■ As shown in the above figure, let the electric currents in sequence flow through the 4 windings to revolve the stepping motor. Of 3
methods of 4 couple stepping switch sequence, 1 Phase Exciter Method, 2 Phase Exciter Method, and 1-2 Phase Exciter Method,
the last method was adopted for this circuit. Based on this method, the signals come in the order of S1, S2, S3, and S4 to create
magnetic force and one frequency forms a cycle. When S1, S2, S3, and S4 receive the following signals respectively, the stepping
motor begins operation.
Power OFF Power ON
S4 S2
S1
S3
M
1
1
0
0
0
2
1
1
0
0
3
0
1
0
0
4
0
1
1
0
5
0
0
1
0
6
0
0
1
1
7
0
0
0
1
8
0
0
0
1
S1
S2
S3
S4
1
0
0
0
1
2
0
0
1
1
3
0
0
1
0
4
0
1
1
0
5
0
1
0
0
6
1
1
0
0
7
1
0
0
0
8
1
0
0
0
Power OFF (Closing) CCW ("1"=HIGH)
Switch
Power ON (Opening) CW ("0"=LOW)
S1
S2
S3
S4
S1
S2
S3
S4
Circuit Description (cont.)
DB98_16444A(1)_2 2/9/04 10:05 AM Page 74