Influential Factors On Lifting Capacity - Tractel magfor II 100 Manual De Empleo

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Air-gap

It corresponds to the space between the magnet lifter active poles and the load due to surface

roughness, oxidation, paper or painting on the load, flashings, etc.

A rusted hot laminated plate presents an air-gap between 0.1 to 0.3 mm. Surface roughness on a

piece in wrought iron can reach 0.5 mm.

Permanent magnet lifter capacity is reduced when the air-gap increases (see table in following

paragraph).

Dimensions of the load (see table in following paragraph)

Thickness and contact surface : a load too thin or a contact which doesn't cover all the active

poles surface, doesn't allow a good closing of the magnetic circuit and reduces the magnetic

force on the load.

IMPORTANT : presence of holes with large dimensions also limits the magnet lifter capacity.

Length: bending of the load due to its long length produces an air-gap.

Load horizontality

To achieve the maximum capacity of a magnet lifter, loads must be perpendicular to the active

poles surface. That is why it is necessary to find out, with a good positioning of the magnet lifter,

the best horizontal position of the load before lifting.

Kind of load

Steel type *

Low carbon content (E24-2,

S235)

St 52 (A50-2)

Stainless steel 430F

Fonte

Nickel

Stainless steel 304

WLL: working load limit

* non exhaustive list

** % regarding maximum working load limit of magnet lifter with steel with low carbon content

(like S235 steel) with a surface roughness ≤ 0,1 mm (smooth and clean manufactured surface)

and for loads dimensions which are within the parameters given the « practical tables for capacity

reduction ».

The same reduction % apply to WLL of magfor not listed in this table

M 6053 M

rev 16 – 04/2021