Maxwell SV Getting Started: A 2D Magnetostatic Problem - LES

Getting Started: A 2D Magnetostatic Problem
Assign SS430 to the Plugnut
Next, create a new material — SS430 — for the plugnut. Like the material ColdRolledSteel, it is a
nonlinear material whose relative permeability must be defined using a B-H curve. The first step
includes selecting the plugnut and creating the material.
Select Objects and Create Material
To select the plugnut, and create the material:
1. Select plugnut from the Object list.
2. Click Material>Add.
3. Under Material Properties, change the name of the new material to SS430.
4. Select B-H Nonlinear Material.
Define the B-H Curve
To define the B-H curve for SS430, click B H curve.
The B-H Curve Entry window appears.
Define Maximum and Minimum Values for B and H
For SS340, the values for H will fall between zero and 40,000 amperes per meter. The values for B
will fall between zero and 2.0 tesla.
To change the graph size of the B-H curve:
1. Enter 0 in the Minimum H field.
2. Enter 0 in the Minimum B field.
3. Enter 40000 in the Maximum H field.
4. Enter 2.0 in the Maximum B field.
5. Click Accept.
Add B-H Curve Points
To enter the points in the B-H curve:
1. Click Add Point.
2. Click the left mouse button at the origin of the B- and H-axes (0, 0).
3. Enter the following points using keyboard entry, as described under “Define the B-H Curve” in
“Assign Cold Rolled Steel to the Bonnet and Yoke.”
H B
143 0.125
180 0.206
219 0.394
259 0.589
298 0.743
338 0.853
378 0.932
4-10 Setting Up the Model