Learning Forum

[lee.seungwoo]

Hello, I am using Ansys software to study microcoils. I am analyzing the effects of magnetic and electric fields generated when current flows through an insulated coil using the Eddy Current mode, and I have some questions about its analysis method.  

 

1. From what I understand, the current used in this mode is typically sinusoidal. Thus, when a sinusoidal current flows, the generated magnetic field changes over time, inducing an electric field in the opposite direction according to Maxwell's equations. Consequently, when a sinusoidal current flows, an induced electric field with a phase of -cosine should be generated. However, in the Eddy Current mode, it seems that the phase of the induced electric field aligns with the phase of the current, both having a sinusoidal phase. I am curious why this result occurs. (I used 1kHz)

 

2. I have also observed that this phenomenon varies depending on the analysis frequency. Why does the result change with frequency, and how can we predict these changes?  

 

3. Additionally, I would like to understand how enabling or disabling the Eddy Effect within the Eddy Current mode affects the analysis.  

 

I look forward to your smart and insightful answers to help resolve these issues.  

 

Thank you.

[NA]

Hello lee.seungwoo,

Let me try to answer each question independently.

1)      The phase shift will be visible if you uncheck the displacement currents on the objects where eddy effects are calculated.

2)      Eddy effects are heavily impacted by frequency, since skin effect is considered in the calculation.

3)      Yes eddy effects affect the analysis. Eddy effects are typically enabled for conductors to account for skin and proximity effects but are disabled for insulators like ferrite cores and boards. So they will influence the fields calculated.

I hope this helps.