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SafeField™ coded magnets can exhibit very short-range magnetic fields while still delivering superior
holding strength. Magnets formerly too dangerous to handle for transport and assembly, and too unsafe for product design are now much safer magnets thanks to engagement-distance control made possible with correlated magnetics.

Stronger AND Safer

SafeField technology from Correlated Magnetics Research means very strong magnets can be employed with a much higher margin of safety than conventional magnets.

Shown at top right is a comparison of identical magnet pairs, both comprising 3” disks, one-eighth of an inch thick. One pair, coded with CMR’s SwirlCode pattern (blue curve) delivers 95lbs coupling force - much stronger yet much safer compared with conventionally magnetized disks (shown as red curve at <35lbs coupling force).

At one tenth of an inch of separation, the Swirlcode attraction force (4.9lbs) is one-third that of the standard magnet pair (17.4lbs). The bottom chart depicts the comparison of SwirlCode magnets versus conventional magnets of equivalent holding strength: the coded magnets (4.9lbs) are less than one tenth the residual attraction force (53.4lbs).

Compound Attributes

Because the attributes of correlated magnetics can be additive, this stronger-yet-safer magnetic device can also be easily separated.  The SwirlCode was engineered to release by simply twisting one magnet relative to the other. Shown at right are the force curves for the SwirlCode 529 magnets at their correlated position (blue, 95lbs peak attraction force) and at 20 degrees rotation (red), where the opposing forces begin to cancel and the holding force drops to less than 12lbs.

The figure below depicts the dangerous “reach” of conventional magnets by comparing an optimized MaxField coded magnet with a conventional magnet of equivalent peak holding force (in excess of 250 lbs).

At one full inch of separation the standard magnet will still attract and accelerate very heavy metal objects, whereas the MaxField attraction is essentially zero.  In fact, the MaxField optimized field is near zero at less than a quarter inch from the magnet surface.

This limited “reach” of the magnetic field, means that strong magnets can be employed in product and machine design and remain very safe for handling and assembly.

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