I am new in using EAGLE and I am currently trying to design a magnetorquer board. I would like to ask if it is possible to somehow create a solid-core electromagnetic coil (torque rod) that has known electrical and physical values: core (material, size-diameter and length-)and wire characteristics (number of windings, size, max current carrying capabilities, etc) in such a way to integrate it into my PCB design.

Moreover, i would like to create an air coil electromagnetic core in a rounded square for the back side of the same PCB.

For better undestanding, I will link the ISIS Magnetorquer board with images of its top and bottom views. Therefore, succinctly,my question is I can somehow integrate the electromagnetic coils to the PCB design or in the worse case scenario if there exists a library that include any customizable electromagnetic coils or any pre-made ones.

If not, is there any other program that can do this and that can be accessible to a newbie? (I'm running very low on time so I would take just about anything now)

EDIT:As the question is a little bit abstract(i am truly sorry for that), I will try to make it more specific with the help of your feedback.

EDIT4: In the links above, the electromagnetic coils (torque rods) are mounted on the PCB by using a plastic (or another material) support as seen in the links above, so they are separate components. The question above should have been how do I take these coils into consideration when designing the PCB in EAGLE. I believed that there is an electromagnetic coils library or that I can design it myself as a part somehow and this is the reasoning for the weirdly phrased question.


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    \$\begingroup\$ Those appear to just be coil components soldered to a PCB, rather than anything special with the PCB itself. \$\endgroup\$ Commented Aug 18, 2020 at 18:36
  • \$\begingroup\$ Indeed they are soldered, but shouldn't they be somehow taken into consideration when designing the PCB? If so, how does one do that with EAGLE? Is there any other element I can replace them with? Yes, the question is weirdly formulated, i will try to edit it and fix it with the feedback i get. \$\endgroup\$ Commented Aug 18, 2020 at 19:29
  • \$\begingroup\$ "... that I can design it myself as a part somehow" - if the coils are a component soldered onto the board then that is what you must do. \$\endgroup\$ Commented Aug 18, 2020 at 19:52
  • \$\begingroup\$ @BruceAbbott The design of a coil is not a hard job, as I have said, i have all the calculation and elements needed, but how can I make a connection between it and the PCB design in EAGLE? How should I take into consideration the coil in the PCB design if I cannot add it as a "part" in neither the schematic or the board. Or can I? How? \$\endgroup\$ Commented Aug 18, 2020 at 20:16
  • \$\begingroup\$ If it's soldered onto the board, why would you not be able to create a part for it in Eagle? \$\endgroup\$ Commented Aug 18, 2020 at 20:19

1 Answer 1


You can integrate coils into the PCB, yes. Is it efficient? No.

Q-factor of PCB inductors is generally lowered then Q-factor of the inductors having a coil of wire and less than that of the cylindrical microstrip coils. The self-capacitance of the printed inductors depends on the width of the spiral turns, the gap between them and the PCB material and can reach 3 to 5 pF, which is pretty high at such frequencies

Source: https://coil32.net/pcb-coil.html

The magnetic moment is a factor of the number of turns, the current and the area. So many torquer coils are simply rectangles built into one or more layers of the PCB.

m = nAI

More turns are easier to create with wire, which has a much higher packing factor for current carrying wires than a PCB (or flat flex), because enamel is much smaller than layers of a PCB or flat flex. It really depends on the magnetic moment needed, if you need a high magnetic moment, then you might have to resort to wire outside of the PCB, because most PCB's are fabricated with 4 layers (you can do more, but it comes with a cost).

If you do wish to create a magnetorquer on a PCB, eagle (or any PCB software), just draw the pattern out by hand in the software.

In the design I used for a magnetorquer (which flew) I personally wound a rectangular delrin frame with about 400 turns, which was then fastened to 4 posts on the PCB. The wire was soldered into vias. I remember that the other 2 torquer coils were built into the solar panel arrays.

Here is a paper describing a satellite with coils built in to the PCB with copper traces forming the coil:
enter image description here

Source: Innovative power management ADCS

  • \$\begingroup\$ Thank you for the answer and for taking your time to explain this, it is very interesting and I will probably read more into it in the future. It is not what I need, but it is entirely my fault for not being clear. \$\endgroup\$ Commented Aug 18, 2020 at 20:51
  • \$\begingroup\$ Is your question how to create a part in eagle? There are no standardized libraries for torquer coils, they are all custom designs \$\endgroup\$
    – Voltage Spike
    Commented Aug 18, 2020 at 20:55
  • \$\begingroup\$ Yes. It is about how to create i create a torque rod part so I can use it in the "schematic" and "board" parts of the project. Or how to take this torque rod and its electrical characteristics into consideration when designing a PCB in Eagle ( example of the finished product ) \$\endgroup\$ Commented Aug 18, 2020 at 21:04

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