This Coil Calculation Program allows you to easily experiment with all those factors. And more turns means a larger coil and/or a better Packing Fraction. More AmpereTurns dictate thicker wire (or wires), and thicker wire means more current and higher power dissipation unless the number of turns can be increased to compensate. For instance if you doubled AmpereTurns (without increasing the winding space) then power dissipation would increase by 4 times! * Note that power dissipation is very sensitve to AmpereTurns. Lastly consult a table of standard wire gauges and choose a wire, or wires, that have a combined cross-sectional area equal to the value calculated in step 3. The program will automatically add more turns if you increase the width or depth of the coil, or if you increase the Packing Fraction. Aternatively more turns can be added to the coil to reduce the current. If it is too high (say more than 2 kW per metre of coil length) then AmpereTurns will need to be reduced. Now look at the Coil Heating (the power dissipation)*. Set Wire 2, 3 and 4 to zero and then guess a value for the diameter of Wire1 and note how many AmpereTurns result.Īdjust Wire1 diameter until your target AmpereTurns are achieved, say about 3,500 to 4,000 AmpereTurns.Īlternatively you can set Wire1 to a preferred size and then adjust Wire2 to achieve your target, or set both Wire1 and Wire2 to preferred sizes and then adjust Wire3 to achieve your target etc. Input the dimensions for your proposed coil, and your intended supply voltage. (If you wish to preserve your own data then Save or Print the page before refreshing it). The example numbers will return to the sheet if you refresh the page. Replace the example numbers with your own coil data. The pre-filled numbers in the input data fields are just an example and are typical numbers for a 1250E Magnabend folder. This makes it very quick and easy to check a coil design or to experiment with a new coil design.
The program updates the Calculated Results section every time you hit ENTER or click in another input field. To use the calculation sheet simply click in the Coil Input Data fields and type in your coil dimensions and wire sizes. The calculation sheet below was designed for "Magnabend" coils but it will work for any magnet coil which operates from rectified (DC) voltage. Many thanks to my colleague, Tony Grainger, for the JavaScript program which performs the calculations on this page. This prompted me to come up with this web page which enables automatic calculations to be performed once some basic coil data has been entered. People often ask me to check their calculations for "Magnabend" coil designs.
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