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Magnetic edge forces occur when mutually attractive or repulsive magnets are moved past each other in an operating direction.
English (United States)
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Low Release Force Latch Configuration Using Magnetic Edge Forces
Magnetic edge forces occur when mutually attractive or repulsive magnets
are moved past each other in an operating direction.
As shown in Fig. 1, a magnet 3, movable in the direction of arrow P or ST, is
arranged between two stationary magnets 1 and 2 facing each other. By means
of repulsive magnetic edge forces, magnet 3 is forced to assume a backstop
position in direction ST. An external release force applied in direction P causes
magnet 3 to be driven from the area of the edge forces active in direction ST,
beyond a neutral point, to the area of the edge forces active in direction P. By
means of the latter edge forces, the kinetic energy required, for example, for
printing, is applied to magnet 3 and any device attached to it.
Fig. 2 shows a representation of the edge forces active near the neutral point N. Curve I applies to a movable magnet 3-1 with a relatively small extension in
direction P and a relatively great extension in direction 0. Curve II shows the
magnetic edge forces of a magnet 3-2 with a magnet pole face area equal to that
of magnet 3-1 but wider in direction P and shorter in direction 0. The release
energy is subject to the force characteristics of curves I to III and to the distance
between backstop position ST and neutral point N. The area between the curve
for the magnetic edge forces and the abscissa between the two points ST and N
represents the energy which has to be compe...