Re: [TCML] Flat strip primary inductance

[Paul Nicholson <tcml87@xxxxxxxxxxx>]

Here is a model coil - a ribbon primary, and some results.

Plane of ribbon: vertical;
Inner diam: 55.88 cm;
Turns: 4;
Pitch: 0.18128 cm;
Outer diam: 55.88 + 0.18128 * 4 * 2 cm;
Ribbon thickness: 0.1 cm;
Ribbon width: 5.08 cm;

The coil is modeled using a number of equally spaced filaments
each having a diameter equal to that of the ribbon thickness.

filaments   L uH
1           29.46
2           19.87
3           18.29
4           17.74
5           17.48
6           17.34
7           17.25
8           17.20
9           17.16
10          17.13
12          17.10
14          17.08
18          17.06

As a by-product we get the current distribution across the
width of the ribbon.  For 18 filaments numbered 1..18, the
percentage current down each filament is:-

  1: 18.33
  2: 5.52
  3: 4.57
  4: 4.16
  5: 3.75
  6: 3.54
  7: 3.46
  8: 3.37
  9: 3.30
 10: 3.30
 11: 3.37
 12: 3.46
 13: 3.54
 14: 3.75
 15: 4.16
 16: 4.57
 17: 5.52
 18: 18.33

The current distribution is symmetric, but that's only because
this is a vertical ribbon.

Having modeled the ribbon coil in this way, there is then the
question of how to represent the coil during calculations of
M with other coils.  I was thinking of representing it as a
single filament, the position of which corresponds to the
'center of mass' of the current distribution.  Question is,
would that be sufficient for typical primary-secondary M
calculations?
--
Paul Nicholson
--

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