Holding Forces; Rated Holding Force, Displacement Force And Pole Pitch - Sav 243.01 Operating Instructions Manual

SAV 243.01 /.07 /.10 /.11
SAV 220.30 /.31 /.32
3.1

Holding forces

3.1.1

Rated holding force, displacement force and pole pitch

Holding and displacement forces in magnet technology
Pole pitch, shape of the workpiece, surface quality and material have a great influence on the holding and dis-
placement force of a workpiece.
a) The holding force is the pull-off force of a chucked workpiece perpendicular to the chucking surface.
b) The displacement force is the force required for displacing a workpiece parallel to the chucking surface. The
displacement force is approx. 15 to 30 % of the holding force depending on the surface quality. It depends on
surface roughness and adhesion.
Where no further details are provided, the rated holding forces stated for our products apply to a test workpiece
made of steel 1.0037, polished, with the dimensions 100 x 100 x 40 mm.
Fig. 1: Holding and displacement forces on magnetic chucks
Definition of pole pitch
To achieve a uniform holding force across the entire chucking area and also chuck small workpieces, chucking
magnets are manufactured with different pole pitches and pole spacing. The chucking area is consequently
designed with alternating north and south poles. The pole gap consists of non-magnetic materials such as brass
or plastic.
pole gap
N
Fig. 2: Definition of pole gap and pole spacing for magnetic chucks
Version 1.0
3 TECHNICAL SPECIFICATIONS
Holding force
Magnet
S N S N
displacement force
pole spacing P
S
[ ]
39
EN