# FAQ Category Archives: Analysis

## Can we use uniform heat distribution with BEM (Boundary Element Method)?

Heat and resulting temperature distribution always has to be a Finite Element Solution. But if you just want to calculate power loss distribution, that can be done using BEM.

## Can you determine the AC resistance of the coils?

Yes, there are two ways. You can assign a constant volume current and then calculate the power loss, or you can use eddy current windings with a voltage source and obtain the resistance from the winding current.

## Can you calculate eddy current losses in metal switchgear enclosures?

Yes, but it depends on the thickness of the metal switchgear and how big the overall system is. Because it can take up quite a bit of computer time, you have to deal with it on a case to case basis.

## What type of solvers should be used for my particular application?

For the electromagnetic portion of the solution, you can use either the Boundary Element Method (BEM) or the Finite Element Method (FEM) if you are performing a time harmonic (phasor) simulation.  If you are performing an electromagnetic transient, the Finite Element Method must be used.  For thermal analysis (static or transient), only the Finite Element […]

## Why do my Voltage contours sometimes cross electrode surfaces?

Although this might indicate a bad solution, it usually is an artifact of the nature of the contour plot which is exagerated by the plot being too coarse with respect to the geometric detail. To illustrate the nature of contour plots and artifacts such as this, consider the electrode (light yellow area bounded by black […]

## How can I get a better looking contour plot?

Background on contour plots When we make a contour plot we set up a grid of x,y,z coordinates and calculate the field at those points. We then do interpolations to sketch out the lines that get plotted and displayed on the screen. The interpolations are simply a series of straight lines that connect points of […]

## What is the difference between the streamlines and trajectory functions?

In streamlines, the test charge used has no mass, or velocity. This means it follows the path of the electric field. Effectively what you should end up with is a limited version of the E-field. To calculate the resultant curves, Coulombs law is used. Streamlines can be drawn off of a voltage potential, or from […]

## How do I account for torque and loss in a 2D motor model?

For a 2D model, the total loss is given in W/m and torque in N*m per m. As the result is assumed to be continuous in the direction perpendicular to the two-dimensional model, the total loss in W or the total torque N*m is obtained by multiplying the loss in W/m or the torque in […]

## What are scratch files?

INTEGRATED’s CAE tools create two temporary scratch files during analysis. Prior to performing an analysis you can check the scratch file size by using the command ProblemSize under the Element submenu. This command displays the size of each scratch files in Mega bytes. The size is related to the number of elements in your model. […]

## How do I perform magnetic energy loss calculations?

MAGNETO has the ability to input a magnetic loss curve in the Material Table and then assign the material to the model’s geometry. The magnetic loss curve combines hysteresis loss and lamination loss (eddy current losses in the laminations) information. These loss curves are available from the material supplier. The software requires that you place […]