Calculating the Nichrome Spiral
Calculation of nichrome spiral
Winding nichrome thread in heating appliances, as a rule, produce «by eye», and the required number of turns is selected based on the heating of the wire after the inclusion in the network. Such a process spends irrationally time, leads to a large overspending of the valuable nichrome. The table below provides an opportunity to optimize the calculation process. All data are given for a filament, respectively, the known resistivity of nichrome, equal to 1.12 ohmmm2 / m at a voltage of 220 V. Using the table, it is easy to determine the diameter of the rod on which the spiral is wound and the length of the «turn to winding» winding, depending on the thickness of the wire. The length of the spiral under a different voltage is recalculated using the usual mathematical proportion.
Legend: the length of the helix is L, cm; Diameter of the rod-D, mm.
| Nichrome diameter, mm 0,2 | Nichrome diameter, mm 0,3 | Nichrome diameter, mm 0,4 | Nichrome diameter, mm 0,5 | Nichrome diameter, mm 0,6 | Nichrome diameter, mm 0,7 | Nichrome diameter, mm 0,8 | Nichrome diameter, mm 0,9 | Nichrome diameter, mm 1,0 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| L | D | L | D | L | D | L | D | L | D | L | D | L | D | L | D | L | D |
| thirty | 2 | 43 | 2 | 68 | 2 | 46 | 3 | 53 | 3 | 62 | 3 | 54 | 4 | 72 | 4 | 63 | 4 |
| 49 | 1.5 | 59 | 1.5 | 77 | 1.5 | 64 | 2 | 76 | 2 | 84 | 2 | 68 | 3 | 78 | 3 | 75 | 3 |
| 21 | 3 | thirty | 3 | 40 | 3 | 36 | 4 | 40 | 4 | 49 | 4 | 46 | 5 | 68 | 6th | 54 | 5 |
| 13 | 5 | 18 | 5 | 24 | 5 | 26th | 6th | thirty | 6th | 34 | 6th | 31 | 8 | 33 | 8 | ||
| 16 | 4 | 22 | 4 | 28 | 4 | thirty | 5 | 33 | 5 | 40 | 5 | 40 | 6th | 52 | 8 | 48 | 6th |
| 20 | 6th | 22 | 8 | 26th | 8 | 24 | 10 | thirty | 10 | ||||||||
| 22 | 10 |
For example, it is necessary to determine the length of a spiral from a nichrome wire, with a thickness of 0.3 mm, for winding a rod with a diameter of 4 mm at a voltage of 127 V. The table shows that the length of the spiral at a voltage of 220 V equals 22 cm. Making the usual ratio: 22 cm — 220 V; X — 127 V, you can see: X = 22x127 / 220 = 12.7 cm. When winding the spiral, you need to unplug it and connect it to the voltage source, making sure the winding is correct. Closed spirals increase the winding length by 1/3 of the value given in the table.
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