ANSYS Maxwell: Locate the Point of Maximum Magnetic Flux Density

Hello everyone, David Giglio here. In this video, I will show you how to use the ANSYS Maxwell ED current solver, an AC solver in the frequency domain, to locate the points of maximum magnetic flux density.

We can use the complex quantity of the B field or the real part of the B field, which is phase-dependent. To use the complex quantity, go to Field Overlays Calculator, then select Complex B. Copy this to the stack.

Choose the geometry over which you want to compute and locate the point of maximum flux density. I will use the E core, for example. Click OK. Then click Maximum Position and Evaluate. It will show you the point where the B field is maximum. The coordinates are displayed here.

To use the real part of the B field, right-click Mag\_B, which is the real part of the B field, and it's phase-dependent. Specify the face. Copy the stack again. Choose the geometry, E core, click OK. Then click Maximum Position. Specify the phase. I'll leave it at zero degrees for now.

Evaluate, and you will get the same answer. To verify, you would have to verify at other angles. But we have the same answer. To know which phase angle the B field is maximum, one way to know is to know the excitation. The B field is maximum when the current is maximum.

So, at the phase angle where the current is maximum, the B field will be maximum. We can create an expression. Copy B filter stack. Mag\_B. Copy stack again. Geometry, Ecore. Instead of Maximum Position, assign Maximum Value. Then add this as a name expression. Give it a name.

This value here is the maximum B field. Now, let's determine the phase angle at which this occurs. Go to Results, right-click Fields, Report, and Rectangle Plot. Select Phase and then B max E. This is the value of the maximum flux density versus phase angle. Click this.

It shows the positive and negative Level sugar is zero degrees. At 180 degrees, the flux density is maximum. Sure, it's positive magnitude is as great as 0 degrees, and its negative minimum is unless it's positive. Then, zero degrees and then it is probably the same.

The orange plot is the complex magnitude of the B field versus phase angle. It does not depend on phase, which makes sense because the complex quantity has a real part and the magnitude of that is always equal. Let's discuss something. When we say phase, this is actually phase delay.

However, if we look at the manual, Omega T is the phase angle. In the excitation, this phase is phase delay. Once we determine the location of the maximum flux density, copy and paste those coordinates into a point drawn in the model. Then, plot that point.

We see here that point is this over here, this point, which I gave a pink color. If you right-click this plot, click Modify, look here. Phase is the phase angle at which the quantity is evaluated. So, let's choose 90 degrees. We see that this value is going to change.

The maximum is now 0. 36. Click Apply. We see it reduced to 0. 041. The field distribution also changed because it's phase-dependent. Go back to degrees, Apply. Let's do the same thing now for this complex permeability. If I choose phase angle zero degrees, it's 0.36 Teslas.

If I switch this to 90 degrees, click Apply, nothing changed. The field distribution is the same, and the maximum magnetic flux density is the same.

I showed you two ways to locate the point of maximum magnetic flux density and clarified the difference between phase angle and phase delay in the excitation. For example, the 80 current solver uses a cosine reference for the real part of the phasor.

If we use a Maxwell circuit, we need to have that in mind. If we use a sinusoidal source, the phase here is phase delay. When you see phase alone, you have to distinguish if that's phase angle or phase delay.

In the sources and the excitation, it uses phase delay to evaluate the quantities like the B field plus the phase angle. The phase is referred to the phase angle at which to evaluate the B field or any other quantity. That is all, folks. Like this video if you like it.

Subscribe to our Ozen Engineering YouTube channel to be updated of new content we create and upload constantly. Contact us to learn about our simulation capability and request a demonstration for us to show you how we can help you with your engineering projects.

We provide training to use ANSYS tools. Visit us at [www.ozening.com](http://www.ozening.com). Call us. You will find our number and email address there. Thank you very much, and take care.