Idiomas disponibles
Idiomas disponibles
2. Factors affecting the lifting force of the lifting magnets
On the underside of the lifting magnets are the two magnetic poles, which transmit the magnetic force in
the activated state to the load. The maximum possible forces and thus the Lifting capacity depend on the
factors described in 2.1-2.5 . Note this anytime and check BEFORE any application, whether the data of the
lifting magnets and the load allows a safe transportation.
2.1 The contact surface
The contact area between Lifting magnet and the load to be lifted should be clean and free of irregularities
in any case. If a distance (air gap) is made between the lifting magnets and the load to be lifted, this
reduces the lifting capacity. Rust, paint, dirt, paper, or a roughly machined surface can thus have an air gap
result. Please refer to the tables beginning on page 54.
2.2 The Material thickness
The magnetic flux of the lifting magnets requires a minimum material thickness. If the workpiece
does not accomplish a minimum material thickness, this will reduce the lifting force. Basically higher
Lifting capacity requires increasing the thickness. Please refer to the tables beginning on page 54.
2.3 The workpiece dimensions / intrinsic stability
At great length and width of the workpiece it bends through and formes an air gap between the workpiece
and the lifting magnets (primarily at low thicknesses). This reduces the lifting force of the lifting magnets.
Not intrinsically stable workpieces also vibrate more than massive workpieces and the resulting, the
dynamic forces act in addition to the contact surface.
2.4 The composition of the load to be lifted
Steel with low carbon content is a good magnetic conductor e.g. C40 or S235JR(St37). Steel with a high
carbon content or with other materials alloyed steel loses its magnetic properties, so that the power of
the lifting magnets is reduced. Hardness and other methods which affect the steel structure also reduce
the lifting power. The harder a steel, the lower its response to magnetic fields and it tends to residual
magnetism. The nominal power of our Lifting magnets applies to steel with low carbon content, such as
e.g. C40 or S235JR(St37).
Material
Carbon steel 0,1 - 0,3 % C
Carbon steel 0,4 - 0,5 % C
Alloyed steel F-522
cast iron
F-522 Steel cured at 55-60 HRC
stainless steel
Brass, aluminum, copper
2.5 The Temperature of the Load to be lifted
The higher the temperature, the faster the molecules of the steel swing, which causes a lower
magnetic conductivity. Our figures are for a workpiece temperature up to max. 80°C. In the case of FX-VV
a maximum temperature of 150°C applies.
Caution:
You have to combine all the factors which reduce the lifting power and observe one to another.
16
Lifting capacity in %
100
90
80 - 90
45 - 60
40 - 50
0
0
