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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