{"id":373726,"date":"2024-07-26T06:35:38","date_gmt":"2024-07-26T06:35:38","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/litz-wire-self-rezonance\/"},"modified":"2024-07-26T06:35:38","modified_gmt":"2024-07-26T06:35:38","slug":"litz-wire-self-rezonance","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/litz-wire-self-rezonance\/","title":{"rendered":"litz wire, self rezonance"},"content":{"rendered":"

I wanted to design a coil in Maxwell 2D (cylindrical about Z). Specifications of my coil in reality are like this: It has 80 turns, 1 layer, its material is copper and it consists of a litz wire which has 125 strands each of which has 0.0799mm diameter. Litz wire (125 strands all together with insulator around them) itself has 1.2mm radius.  <\/span>After creating a rectangle and assigning a coil terminal to it, I specify the number of conductors as 80. I set the material type as copper, compositions as litz wire, strand number as 125, wire diameter as 0.0799mm. I arrange the length of the rectangle as 80(turns)*1.2mm= 96mm. What makes me confused is that what happens to the wires when we change the length of the rectangle? It does not give any error when I set the length shorter than 96mm or make it longer then 96mm, how does Ansys arrange the location of litz wires in the 80 conductors that I set, does 1 conductor contains only 1 litz wire?<\/span><\/p>\n

Another question I have is that is it possible to create multiple layers in a single rectangle (cross section of a coil). As above if I have a coil that has 80 turns but has 3 layers instead of 1 what should I do. I thought to set number of conductors as 3*80 = 240. However, I am not sure if it suffices because if Ansys divides rectangular cross sections to 240 subsections and locate them next to each other as if they are the 240 turns of a single layer, I will not be able achieve my goal. I also tried creating three different rectangles next to each other to represent different layers, however; since my design contains 16 different coils and each coil has at least 4 layers it does not seem as an effective solution.              <\/span><\/span><\/p>\n

Finally, is it possible to measure the self-resonance of a coil in Ansys Maxwell? Because of the potential difference between the turns and layers of a coil, coil also have a capacitance and for a specific frequency impedance of the coil must have peak value. I did a frequency sweep in the eddy current solver type for a coil with 20 turns and 1 layer. Even though I made a frequency sweep from 1Khz to 100Mhz impedance of the coil increased linearly. Normally it is expected to have a sharp peak at some point and decrease afterwards.  <\/span>I did this in both 2D and 3D designs. Using cylindrical representations instead of helix could be the reason why I am not seeing a self-resonance effect or isn’t Ansys Maxwell capable of it?<\/span><\/p>\n

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