2
\$\begingroup\$

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.

EDIT2:

\$\endgroup\$
7
  • 1
    \$\begingroup\$ Those appear to just be coil components soldered to a PCB, rather than anything special with the PCB itself. \$\endgroup\$ Aug 18 '20 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\$ Aug 18 '20 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\$ Aug 18 '20 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\$ Aug 18 '20 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\$ Aug 18 '20 at 20:19
4
\$\begingroup\$

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

\$\endgroup\$
3
  • \$\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\$ Aug 18 '20 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
    Aug 18 '20 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\$ Aug 18 '20 at 21:04

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.