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Question about quality factor and inductance of coils when using HFSS, Maxwell3D, and Q3D

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Tyrion

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Currently, I am designing wireless power transfer coils and want to know the Q factor of my coils. I tried HFSS, MAXWELL3D and Q3D. Their inductance are all different. Which one is more accurate for me to use?

My coil is a planar spiral coil with 40turns, 25mm outer diameter, 5mm inner diameter.

The HFSS result is usually a few nH and -nH varying by frequency. The Maxwell3D is about 2uH and the Q3D gives me about 24uH.
 

volker@muehlhaus

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The problem is that you might have used some of the tools incorrectly.

24µH seems realistic.

I have simulated many planar coils in EM tools, and recommend to use this online calculator to estimate results:

For your low WPT frequencies, the simple calculator is quite accurate. Width and spacing determine the inner size and that has a large effect on inductance.

Good luck!
Volker
 

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