iC-MZ
DIFFERENTIAL HALL SWITCH
Rev B1, Page 11/12
Pole wheel scanning
Pole wheels have a cyclic magnetization along their
perimeter which is used for the magnetic modulation
of iC-MZ. The intensity of the magnetic field is great-
est along the perimeter and significantly diminishes
with an increase in distance , so that iC-MZ should be
placed as close to the pole wheel as possible.
pole wheel
P
The magnetic subdivision along the pole wheel
perimeter is repeated by a cycle P; iC-MZ’s electrical
output signals also demonstrate this periodicity. The
pole wheel is optimally adjusted when the Hall sen-
sors are activated in antiphase, i.e. the distance of the
Hall sensors is equivalent to just half a magnetic cycle.
With iC-MZ this is the case when P = 4 mm.
B1
S1
S2
iC-MZ
B2
B
B1
B2
P
3P/2
P/2
The dimensions of a pole wheel and its magnetic sub-
division are often stipulated by the application so that
the signals provided by the two Hall sensors are no
longer in antiphase but in an arbitrary yet fixed phase
relation to one another.
B1-B2
P
B
B
T,hi
T,l o
0
P/2
3P/2
The differential signal and the analog and digital iC-MZ
output signals derived from it in dependence on the an-
gle of rotation of a pole wheel are shown in Figure 10.
V
VA
VNA
Vdc
0
P/2
3P/2
P
VD
V
B
P/2
P/2
P
P
3P/2
3P/2
VND
V
B
Figure 10: Pole wheel scanning
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