MAGLOGIX MX-750-HL Manual De Instrucciones página 7

Basic Information Concerning the Maximum Holding Force of the MX-750-HL
The magnetic contact area is located on the underside of the magnet incorporating multiple magnetic poles which
generate the magnetic holding force when activated. The maximum holding force that can be achieved depends
upon different factors which are explained below:
Material
Every material reacts in different ways to the penetration of magnetic field lines. The breakaway force of the
magnetic contact area is determined by using common (low carbon) A36 steel. The given load-bearing capacity of
the magnet should be De-Rated based on Table 1. It is up to the user to determine adequate magnetic holding
force for alloys not shown in this table.
Table 1
Material
Non-alloyed steel (0.1-0.3% C content, includes A36)
Non-alloyed steel (0.3-0.5% C content)
Cast steel
Grey castiron
Nickel
Stainless steel, aluminium, brass
Material thickness
The magnetic flux (north to south field lines) of the permanent magnet requires a minimum material thickness to
flow completely into and across the material below the magnetic contact area. Beyond this minimum material
thickness, the maximum holding force continues to decrease (see Detailed Performance Data, Table 2).
Conventional (singular) switchable
permanent magnet
Conventional switchable permanent magnets have a deep penetrating singular (north to south) magnetic field. The
way conventional switchable permanent magnets hold onto steel would be similar to stapling paper together using
one large heavy staple in the center of the page, and not bending the legs together.
The compact multi-field magnetic array of the Maglogix
stapling paper together in a circular pattern with many small lightweight staples close together, and bending the
legs together to achieve an even greater holding force. An infinate number of small magnetic field arrays are the
principle behind the Maglogix
Surface quality
The maximum holding force of a permanent magnet can be achieved in case of a closed magnetic circuit in which
the magnetic field lines can connect up freely between the poles, thus creating a high magnetic flux. In contrast to
iron, for example, air has very high resistance to magnetic flux. If an "air gap" (i.e. a space) is formed between the
workpiece and the magnet contact area, the holding force will be reduced. In the same way, paint, rust, scale,
surface coatings, grease or similar substances all constitute a space between the workpiece and magnetic contact
area. Furthermore, an increase in surface roughness or unevenness has an adverse effect on the magnetic holding
force. Reference values for your MX-750 can also be found in Table 2.
Load dimensions
When working with large workpieces such as girders or plates, the load can deform during the application. A large
steel plate would bend downwards at the outer edges and create a curved surface which no longer has full contact
with the magnetic contact area. The resulting air gap reduces the maximum load-bearing capacity of the magnetic
clamp. Hollow objects or those smaller than the magnetic contact area of the magnet will also result in less holding
power being available.
Load alignment
During lateral load ('shear' mode), the load-bearing capacity decreases dependent upon the coefficient of friction
between the two materials.
®
patented switchable magnetic clamps.
Magnetic force in %
100
90-95
90
45
11
0
®
Maglogix (multi-field) switchable
permanent magnet
®
switchable permanent magnets would be similar to
7