CUT CORES ASSEMBLY

Since the permeability of the air-gap is a unity -thousands of times smaller than that of the core material – the added reluctance of the air-gap is relatively large. EILOR`s manufacturing process minimizes the gap by lapping and cleaning the surfaces. In order to keep the exciting current at a minimum level it is advisable to follow the recommendations below:

  • Care should be taken to keep the surfaces in good condition.
  • Each core half has an identifying dot. Cores must be assembled with both dots on the same side to assure proper orientation.
  • Clean the surface with suitable solvent or rub on a clean sheet of paper.
  • While inserting the core halves into coil tube, care should be taken to insure that no foreign material-especially of the coil tube-is scraped into the gap.

Table. Banding recommendations

CoreCross-Section,
mm ²
CoreStrip Width,
mm
Band Size,
mm
Number.of Bands
Required
BandingForce,
kg
36-120 6-10 5 ´ 0.15 1 18
120-240 10-25 10 ´ 0.15 1 35
240-480 10-38 10 ´ 0.30 1 70
38 or larger 10 ´ 0.15 2 35
480-970 13-29 10 ´ 0.30 1 70
32 or larger 10 ´ 0.30 2 70
970-1930 19 or larger 19 ´ 0.60 1 280
1930-2740 19 or larger 19 ´ 0.90 1 410
2740-3870 51 or larger 19 ´ 0.60 2 280
3870-5800 83 or larger 19 ´ 0.60 3 280

Note:

Other band sizes, numbers of bands and banding forces have also been found convenient.

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