Sav 220.3, Operating Instructions Manual, Page: 40 / 56

Version 1.0
[
40
]
SAV 243.01 /.07 /.10 /.11
SAV 220.30 /.31 /.32
3 TECHNICAL SPECIFICATIONS
3.1.2 Influences on the magnetic holding force
Holding force and workpiece thickness
The magnetic field in the positioned workpiece roughly forms semicircles from one pole to the next.
N N N S S S
workpiece Magnet
Fig. 3: Force line progression for workpiece thickness > pole spacing
N
N
N
S S S
workpiece Magnet
Fig. 4: Force line progression for workpiece thickness < pole spacing
If the workpiece is significantly thinner than the pole spacing, the workpiece does not fully absorb the magnetic
field. This reduces the holding force. The best holding forces are achieved if all force lines run within the workpiece.
A guide value can be that the holding force is not reduced if the workpiece thickness is > 40 % of the true pole pitch.
For thicker and blank workpieces, larger pole spacings can achieve greater penetration of the magnetic field and
therefore a greater holding force for these parts.
The minimum workpiece thicknesses must be observed (see section 3 “Technical specifications”).
Workpiece thickness behaviour of permanent
grinding magnets
PERM
SAV 220.30 / 243.01 / 243.07 transverse pole pitch 1.9 mm
P = 1.9
P = 1.9
P = 1.9
workpiece thickness in mm
ho
ld
ing f
or
ce i
n %
0
100
75
50
25
0 1 2 4 5 6 7 8 9 3