Calculation of the spiral from nichrome
How to calculate nichrome spiral
In the thermal elements of electrical appliances, the spiral is usually wound «by eye». The required number of turns and the heating temperature are selected after being connected to the network. At the same time, irrational consumption of not only time, but also nichrome thread. After reading the table below, you can make a preliminary calculation for a voltage of 220 V with a known resistivity of nichrome = 1.12 Ω · mm 2 / m. The table makes it possible to determine the winding length of the «turn to the turn», taking into account the thickness of the filament and the diameter of the rod on which the spiral is wound. The length of the 127-volt wire is recalculated using the mathematical proportion.
Legend in the table: D — diameter of the rod, mm; L is the length of the helix,
|Dia. Nichrome 0.2 mm||Dia. Nichrome 0.2 mm||Dia. Nichrome 0.3 mm||Dia. Nichrome 0.3 mm||Dia. Nichrome 0.4 mm||Dia. Nichrome 0.4 mm||Dia. Nichrome 0.5 mm||Dia. Nichrome 0.5 mm||Dia. Nichrome 0.6 mm||Dia. Nichrome 0.6 mm||Dia. Nichrome 0.7 mm||Dia. Nichrome 0.7 mm||Dia. Nichrome 0.8 mm||Dia. Nichrome 0.8 mm||Dia. Nichrome 0.9 mm||Dia. Nichrome 0.9 mm||Dia. Nichrome 1.0 mm||Dia. Nichrome 1.0 mm|
For example, it is necessary for a voltage of 127 Volts to determine the winding length of a nichrome wire with a cross section of 0.5 mm per rod Ø 5 mm. The table shows that the length of such a wire for a voltage of 220 volts = 30 cm. Then follows the arithmetic proportion: 220 V — 30 cm 127 V — X cm, then: X = 127 x 30/220 = 18 cm. After winding the wire, connect it To the mains and make sure that everything is correct. In closed spirals, the winding length is increased by one third of the value given in the table. (V. Dorogov Modeler-Designer, 1986)
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