The exciter coil, wound with aluminium conductor using high grade insulating materials, is secured in the housing with a special resin compound of excellent heat conductivity.

The magnet body is constructed from high permeability steel and features, together with the cover-plate of non-magnetic wear resistant steel, outstanding strength and robustness.

The connection of the feed-in cable is covered under a tilting steel hod, either by means of a terminal box divided into coil section and connection section or by means of a plug-in set.

The standard chain suspension consist ring each (fig.1). If required a two-stranded or four-stranded chain suspension with one suspension ring can be supplied.

Load Lifting Magnets offer substantial advantages as compared to mechanical loaders :

• Simple pick-up and put-down of load;
  
  
• Labour Saving : the crane driver need not wait for loaders to complete job;
  
  
• Quicker turn-over to material;
  
  
• Gentle handling of sheet metal (no damage to edges, no deformation);
  
  
• Better utilization of storage space;
  
  
• Simple sorting of plates, blocks, billets.
  
  

The Detachment Force of each magnet can be determined in relation to a given material thickness(s) and the air gap, as under :

If the load is covering the magnet pole area completely, the specific detachment force, as determined from the respective diagram, must be multiplied with the Identification No. as per column 2 of Table.

If the magnet is set in traverse direction on a strip the width of which is less than the length of the magnet, the specific detachment force, as determined from the respective diagram, must be multiplied with the width of the strip (in cm).

If the material, e.g. plates, is lying in stacks, the detachment force, as determined, will be higher than the weight of a plate, which thus remains within the respective detachment force. Therefore, enquiry with ELEKTROMAG will be necessary, provided 2 or more are to be lifted in a single operation.

For the safety of transporting flexible loads, e.g plates of sheet metal, the suitable position of the magnets to the load is of the highest importance. The following rules should be observed:

The magnets must not be suspended rigidly, but must be able to rotate a little around their longitudinal, axes, so that the pole surface can match the inclination of a slightly bending plate. For this reason, the top of the load lifting magnets of type series LMBS have been equipped with 2 point of suspension only.

As our figures show, the magnets are placed on the load in traverse direction.

Contrary to this, Fig.3 shows 4 magnets at a traverse, for transporting a load of billets. Here, the magnets have to be suspended in pairs, on two swings, to ensure an as uniform as possible load on the magnets.

The length of the load determines the number of magnets, the width of the load determines length of the magnets.

Fig. 2 and Fig.4 shows e.g. that a 9 mm thick plate may have a max. length of 4 mtr (2 x X2), if one magnet is used.

With several magnets, the number of magnets required and the most favorable distances are determined as under:

1. Estimate number of magnets from Fig.2
   
   
2. Determine distance:
   
   X1 = (X total) / ( Z + 0.816)       : Z = number of magnets - 1
   X2 = 0.408 . X1

Provide the values determined to X1 and X2 remain within the area of curve , the estimated number of magnets is the correct solution.

Rule of thumb for determining the max. width of plate: The width must not exceed 2.2 times the length of the magnet.

With thin materials, e.g. medium and fine plates, it is advisable to keep the ratio width of platee length of magnet still a little lower,. On the other hand, with loads of thickness exceeding 10 mm, a bigger width of plate is permissible.

If the load is to be transported with a safety margin of 2, the detachment forces, as determined from the diagrams and from Table on page 2 must be divided by 2.

ELEKTROMAG power supply equipment for these applications not only provide current infeed and control, but also such functions as make possible operations with a supporting battery and with an (acoustic) alarm signal.

Equipment and/or circuits differing from our standard types will be considered on request.

Electrical accessories required with the Lifting Magnet: (Available form ELEKTROMAG.)

1. Transformer Rectifier or D. C. Generator.
   
   
2. Contactor Panel.
   
   
3. Cable Reeling Drum.
   
   
4. Master Controller.