Remanence And Hall Gaussmeter Measurement - MAGSYS IGM11 Operating Instructions Manual

Gaussmeter IGM11 Operating Instructions
Chapter 3 Function of the Gaussmeter
Figure 4 Field Strength Pattern of an NdFeB Induction Disk
The diagram in figure 4 shows the measurement with a Hall probe which is moved in
parallel to the surface of the magnet within a distance of 1mm to the measuring surface.
A minimum of the flux density emerges in the center of the magnet. Here approx. 230mT
are measured. Due to the locally changing working points on the radius of the magnet,
the flux density increases toward the outside. In the center the magnet carries the highest
magnetic load in air and therefore provides the lowest flux density.

3.2.2 Remanence and Hall Gaussmeter Measurement

The remance B is a mesure for the aligned magnetic dipoles in the center of the magnet.
r
B is the theoretically maximum flux density that can be achieved if the magnet is in mag-
r
netic idle. If it works against a magntetic resistance, it is always B < B .
r
On the surface of an individual magnet B < B /2 applies even more.
r
Which value is actually measured in the pole center depends on the geometry of the
magnet.
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