Calculation of the spiral of nichrome
How to calculate the nichrome spiral
The thermal elements electrical coil is usually wound up «by eye». The required number of turns chosen and the heating temperature after inclusion in the network. At the same time wasted spent not only time, but also Nichrome thread. After reviewing the table below, you can make a preliminary calculation for the voltage of 220 V with a known resistivity nichrome = 1.12 ohm mm 2 / m. The table allows you to define the length of the winding «turn to turn," taking into account the thickness of the thread and the diameter of the rod, which is wound spiral. The length of the wires under voltage 127 V converted using mathematical proportions.
Symbols in the table: D — diameter rod, mm; L — length of the spiral, see.
|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, the need for a voltage of 127 volts to determine the length of the winding nichrome wire cross-section 0.5 mm rod Ø 5 mm. The table shows that the length of the cables for voltage of 220 volts = 30 cm is followed arithmetic proportion:. 220 — 30 cm 127 — the X cm, then: X = 127×30/220 = 18 cm wound wire, connect it. to the power and make sure that everything is correct. We closed spiral winding length is increased by one-third of the value given in the table. (V. Model Construction of roads, 1986)
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