MagSpring overview

Magnetic Spring MagSpring

MagSpring products can best be described as "magnetic springs". The term "spring", however, is to be understood to mean that MagSpring components generate a constant force over their entire working range, while the characteristic curve for a typical mechanical spring shows an increase in force with increasing displacement (see Fig. bellow).
The generation of force that is independent of the stroke makes MagSprings preferable for balancing weight forces in vertical drive applications. Since MagSprings are purely passive elements, a defined function or position of a device can be ensured in a power-off condition.
For example, a gripper or press head on a vertical mount can be held up, or a slider can be pushed in or pulled out with a constant force.

  Mode of operation

The mode of operation is based on the attractive force of permanent magnets. Accordingly, no energy source (electricity, compressed air, etc.) is needed, so that safety-related applications can also be addressed.
The special design of the flow-guiding components and the magnets translates the strongly non-linear relationship between force and displacement in magnet-iron arrangements into a constant force curve.
Depending on the strength class of the MagSpring, the permanent magnets are either in the stator, in the slider, or in both components.
The slider is guided by an integrated plain bearing, so that MagSprings can be used comparably to gas pressure springs in a design.
Working Range

In the relaxed state, the slider is approximately centered in the stator, while the working end of the slider extends somewhat out of the end of the stator (fundamentally, however, both ends of the slider can be used to mount loads).
From this rest position, the slider can be pulled or pushed out of the stator in both directions.
The force increases from zero to the nominal force within a short stroke length. The working stroke then continues with a constant force. The start position (SP) describes the distance between the working end of the slider and the end of the stator at the beginning of the constant force range.

Thanks to the constant force-displacement curve, many other applications are possible, such as the generation of a constant press force, regardless of position; application of a constant holding force across a large stroke range; or single-sided force support in drive applications.

The effective force is in the range of +/- 10% of the nominal force, due to material and manufacturing tolerances.

For more information about the MagSpring, see " MagSpring Overview.pdf ", here.