For four poles magnetic field
Static change by
the eternal magnetic field
(Parallel shifting totally)
Dynamic change by
electromagnet
(Compensate at the
optional position on the picture.)
S
B
N
S
B
S
B
4H coils
N
S
4V coils
B
Figure 18 The principle of DDCC compensation
1 - 34
N
G
R
S
N
S
G
R
N
N
G
R
S
N
S
G
R
N
B
R
R
B
R
B
R
B
R
B
YHT compensate
R
B
R
B
YVT compensate