ИЭ / 6 семестр (англ) / Курсач / Элкат / Seminar_3_Magnetostatics_Two-wire_line_How_to
.pdf
Magnetostatics How to do the QuickField part of your project (Spring 2019)
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MAGNETOSTATIC PROBLEM |
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Two-wire line and steel cylinder
Due to symmetry
we only need upper half of the model
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Parameter |
Notation |
Value |
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Distance from cylinder to wire |
a |
125 cm |
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Distance between wires |
b |
45 cm |
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Radius of cylinder |
R |
50 cm |
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Diameter of wire |
D |
1 cm |
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Permeability of cylinder |
µR |
400 |
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Wire current |
I |
400 A |
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WEEK 2. QUICKFIELD FUNDAMENTALS |
2 |
Create QuickField Problem
Formulation:
Geometry class:
Axial Length:
Magnetostatics
Plane-parallel
1 m
Note!
Bx
B = rotA
By
= A y
= − A x
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WEEK 2. QUICKFIELD FUNDAMENTALS |
3 |
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Draw the Model Geometry (1/2)
We introduce an artificial outer boundary far enough from the line and the cylinder
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WEEK 2. QUICKFIELD FUNDAMENTALS |
4 |
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Draw the Model Geometry (2/2)
Use the Shape Inserter Tool (Edit / Insert Shape)
Choose a Circle
Anchor Point
Circle Diameter
Coordinates
of Anchor Point
The geometry contains 4 circles:
1.The steel cylinder,
2.Left wire
3.Right wire
4.Artificial outer boundary
And the horizontal diameter of the circular outer boundary
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Diameter |
XC |
YC |
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Cylinder |
100 |
0 |
0 |
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Left wire |
1 |
125 |
0 |
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Right wire |
1 |
170 |
0 |
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Outer Boundary |
2000 |
0 |
0 |
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WEEK 2. QUICKFIELD FUNDAMENTALS |
5 |
Using Symmetry of the Model |
A = 0 |
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Due to symmetry about X-axis, lower part of the model can be removed (including all semicircles below the X-axis).
Then we have to reflect the removed part by means of boundary condition on the X-axis:
HX=0 dA/dy = 0,
i.e. dA/dn = 0
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WEEK 2. QUICKFIELD FUNDAMENTALS |
6 |
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Name all important geometry entities
In order to assign materials, field sources and boundary conditions, we have to give unique names to:
1.All blocks, including:
a)Steel cylinder,
b)Left wire
c)Right wire
d)Surrounding air
2.Outer edges, including:
a)Symmetry axis
b)Artificial outer boundary
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WEEK 2. QUICKFIELD FUNDAMENTALS |
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Material Properties and Field Sources
Right wire |
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(negative current) |
Steel cylinder |
Halved given current
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WEEK 2. QUICKFIELD FUNDAMENTALS |
9 |
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Boundary Conditions Zero Dirichlet
condition
Zero Neumann
condition
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WEEK 2. QUICKFIELD FUNDAMENTALS |
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