Homework Assignment

Analysis of Shunt Resistor
Instructor Dániel Marcsa (lecturer) Lectures: - Office hours: by request	Teaching Assistants: - Office hours: -.

Aim of Assignment

Students will learn the basics of electromagnetic field calculations, their main steps, and gain practice in evaluating results and writing a Technical Report that meets international expectations.

Knowledge needed to solve the problem

• The main steps of the finite element method;
• Theoretical knowledge of the static magnetic field (for defining materials, for excitation);
• Knowledge of CAD system to create geometry;
• Download and install Ansys Electronics Desktop Student.

The Semester Assignment

The task consists of two parts, a basic task, with a faultless solution of up to 70%, and an extra task, with an additional maximum of 30%.

Deadline	-
Output Form:	PDF format. Color drawings should be made so that their contents are clear to the reader in black and white.
Language	English
Place of submission:	In Moodle system.
Late submission:	After every day started, a 5% deduction from the achieved result (i.e. after 5 days delay 100% can only be obtained up to 100% - 5x5% = 75%).
Evaluation:	0 - 48% - Insufficient [F] (1)
	50 - 59% - Sufficient [D] (2)
	60 - 70% Satisfactory [C] (3)
	71 - 84% Good [B] (4)
	85 - 100% - Very good [A] (5)
For the formal requirements, the requirements of CFD and mechanics are also valid here.

Part I of the Assignment

Calculating the resistance and the total loss of the shunt resistor by finite element method

The geometry and dimensions of the task.

A kapott sorszám alapján a feladat geometriájának méreteit a következő táblázatban találja: Semester Assigment.

A feladat: meghatározni az elrendezés esetében a feszültségesést, a rezisztenciát és az ohmos veszteséget.
A feszültségesés az elrendezés két kapcsa között lévő potenciálkülönbség. A rezisztenciát az Ohm-törvény segítségével tudja meghatározni:

[math]R = \frac{U}{I}[/math],

majd a veszteség

[math]P = I^2\cdot R[/math]

képlettel, ahol [math]U[/math] a feszültségesés, [math]I[/math] az áramerősség, [math]R[/math] a rezisztencia.

A [math]z-[/math]irányú hossza (vastagsága) a feladatnak minden esetben [math]5\,\text{mm}[/math] legyen.

Properties of materials.

Anyag	Titanium	Copper	Aluminum	Copper-manganin alloy
[math]\sigma~[\text{MS/m}][/math]	1.82	58	38	20.833
[math]\rho~[\text{kg}/\text{m}^3][/math]	4500	8933	2689	8400
[math]c_{\text{P}}~[\text{J}/(\text{kg}\cdot\text{°C})][/math]	522	385	951	410
[math]\lambda~[\text{W}/(\text{m}\cdot\text{°C})][/math]	21	400	237.5	22

The task is cylindrical to the vertical ([math]z[/math]) axis and the three-dimensional geometry must be prepared according to the specified dimensions (see figure).

Tasks

• Define the problem type based on the given parameters;
• Creating and specifying the task geometry in Ansys Electronics Desktop Student;
• Run the FEM simulation;

The results of the simulations.

Software	Discovery AIM	Maxwell 3D	FEMM	Maxwell 2D
Force [N]	3,586	3,582	3,542	3,587
Inductance [mH]	39,88	39,84	39,71	39,84

• Test of the surrounding region's size as a function of force;
• Energy, force, inductance in the function of the number of finite elements (Triangle);

• Postprocessing [at least two of the below]:

1) determination of force and inductance;

2) displaying equipotential lines;

3) display the magnetic field strength;

4) displaying magnetic flux density vectors.

• Preparation of a Technical Report based on the use of the above results.

Note: The “Part I of the Assignment” elements will be reviewed in detail during the exercise to prepare and run a simulation model for an electromagnetic task. On this basis, students can easily complete Part I of the Assignment by attending the exercises.

Parameters for this Assignment:

Relative permeability of air and coil [math]\mu_r = 1[/math];

The excitation of the coil (To validate the results): [math]I=0.76~\text{A}[/math], [math]N=789~\text{turns}[/math] (DC);

Magnetic curve of the core and plunge:

Figure 1. - Steel 1008 steel magnetization curve.

Part II of the Assignment

Determining the force acting on the moving part of the problem (plunger) and the inductance of the coil as a function of displacement.

Note: This task corresponds to the solenoid valve in internal combustion engines that controls the injection.

Specific tasks

• Considering the plunger movement to the initial state (2mm air gap) from [math]-1.8\text{mm} \text{ to } 10\text{mm}[/math] (at least in 7 positions). Detailed instructions on the solution will not be available.
• This part is intended to measure the degree of autonomy, initiative and diligence of the student, i.e.:
  1. is the student able to do independent work;
  2. to design, assemble and run the simulation alone.