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34 - 41

AS5130

Data Sheet - A p p l i c a t i o n I n f o r m a t i o n

Figure 30 shows a cross sectional view of the vertical magnetic field component Bz between the north and south pole

of a 6mm diameter magnet, measured at a vertical distance of 1mm. The poles of the magnet (maximum level) are

about 2.8mm from the magnet center, which is almost at the outer magnet edges. The magnetic field reaches a peak

amplitude of ~+/-106mT at the poles. The Hall elements are located at a radius of 1mm (indicated as squares at the

bottom of the graph). Due to the side view, the two Hall elements at the Y-axis are overlapping at X=0mm, therefore

only 3 Hall elements are shown. At 1mm radius, the peak amplitude is ~+/-46mT, respectively a differential amplitude

the magnet is not perfectly centered, the differential amplitude will be the same as for a centered magnet.

For example, if the magnet is misaligned in X-axis by -0.5mm, the two X-Hall sensors will measure 70mT (@x= -

amplitude becomes nonlinear, which results in larger errors that mainly affect the accuracy of the system (see Figure

32).

Bz; 6mm magnet @y=0; z=1mm

-0.0015

-0.001

-0.0005

0

0.0005

0.001

0.0015

-3.5

-2.5

-1.5

-0.5

0.5

1.5

2.5

3.5

X-displacement [mm]

N

S