workshop_instructions_trainee07_3_maxwell_transient_translational_motion_W

1、 7.3 Maxwell v15Example (Transient) Translational Motion Translational Motion using the Transient Solver Transient Solver in Maxwell allows to be combined with motion. This motion can be translational, rotational cylindrical or rotational non-cylindrical (relay-type motion). This example shows on a

2、simple geometry how to set-up a translational motion project using the Transient Solver of Maxwell. The geometry consists of a cylindrical NdFeB magnet with uniform distribution of magnetization in the axial direction (z-direction). The magnet moves through a copper hollow cylindrical structure (coi

3、l) with a constant speed of 1 mm per second. As the magnet moves the eddy currents are induced and flow in the copper structure. The goal is to model a time-dependent magnetic field created by moving magnet and determine the eddy currents in the copper structure. 7.3-#ANSYS Maxwell 3D Field Simulato

4、r v15 Users Guide 7.3 Maxwell v15Example (Transient) Translational Motion ANSYS Maxwell Design Environment The following features of the ANSYS Maxwell Design Environment are used to create the models covered in this topic 3D Solid Modeling Primitives: Regular Polyhedron, Rectangle Boolean Operations

5、: Split Sweep Operations: Around Axis Model: Band for translational motion Boundaries/Excitations Natural outer boundary Material properties Edit material (NdFeB axially magnetized magnet with uniform distribution of magnetization) Analysis Transient Results Fields Calculator Rectangular Plot Field

6、Overlays: Current Density Vector Plots Current Density Vector Animation 7.3-#ANSYS Maxwell 3D Field Simulator v15 Users Guide 7.3 Maxwell v15Example (Transient) Translational Motion Launching Maxwell To access Maxwell: 1. Click the Microsoft Start button, select Programs, and select Ansoft Maxwell 1

7、5.0 and select Maxwell 15.0 Setting Tool Options To set the tool options: Note: In order to follow the steps outlined in this example, verify that the following tool options are set : 1. Select the menu item Tools Options Maxwell 3D Options Maxwell Options Window: 1. Click the General Options tab Us

8、e Wizards for data input when creating new boundaries: Checked Duplicate boundaries/mesh operations with geometry: r Checked 2. Click the OK button 2. Select the menu item Tools Options Modeler Options. Modeler Options Window: 1. Click the Operation tab Automatically cover closed polylines: Checked

9、2. Click the Display tab Default transparency = 0.8 3. Click the Drawing tab Edit property of new primitives: Checked 4. Click the OK button 7.3-#ANSYS Maxwell 3D Field Simulator v15 Users Guide 7.3 Maxwell v15Example (Transient) Translational Motion Opening a New Project To open a new project: Afte

10、r launching Maxwell, a project will be automatically created. You can also create a new project using below options. 1. In an Maxwell window, click the / On the Standard toolbar, or select the menu item File New. Select the menu item Project Insert Maxwell 3D Design, or click on the icon Set Solutio

11、n Type To set the Solution Type: Select the menu item Maxwell 3D Solution Type Solution Type Window: 1. Choose Magnetic Transient 2. Click the OK button Set Model Units To Set the units: Select the menu item Modeler Units Set Model Units: 1. Select Units: cm 2. Click the OK button 7.3-#ANSYS Maxwell

12、 3D Field Simulator v15 Users Guide 7.3 Maxwell v15Example (Transient) Translational Motion Create Magnet To Create Magnet Select the menu item Draw Regular Polyhedron 1. Using Coordinate entry field, enter the center of base X = 0, Y = 0, Z = -1, Press the Enter key 2. Using Coordinate entry field,

13、 enter the radius and height dX = 0, dY = 1.3, dZ = 2, Press the Enter key 3. Number of Segments: 36 4. Press OK To Change Attributes Select the resulting object from the history tree and goto Properties window 1. Change the name of the object to Magnet 2. Change the color of the object to Blue Crea

14、te Coil To Create Rectangle Select the menu item Modeler Grid Plane YZ Select the menu item Draw Rectangle 1. Using Coordinate entry field, enter the position of rectangle X = 0, Y = 1.5, Z = -2.5, Press the Enter key 2. Using Coordinate entry field, enter the opposite corner of rectangle dX = 0, dY

15、 = 1, dZ = 5, Press the Enter key To Change Attributes Select the resulting sheet from the history tree and goto Properties window 1. Change the name of the sheet to Coil_Terminal 2. Change the color of the sheet to Yellow 7.3-#ANSYS Maxwell 3D Field Simulator v15 Users Guide 7.3 Maxwell v15Example

16、(Transient) Translational Motion To Create a Copy Select the sheet Coil_Terminal from the history tree Select the menu item Edit Copy Select the menu item Edit Paste A new sheet Coil_Terminal1 is created To Sweep Coil_Terminal1 Select the sheet Coil_Terminal1 from the history tree Select the menu it

17、em Draw Sweep Around Axis In Sweep Around Axis window, 1. Sweep Axis: Z 2. Angle of Sweep: 360 deg 3. Press OK To Change Attributes Select the resulting object from the history tree and goto Properties window 1. Change the name of the object to Coil 7.3-#ANSYS Maxwell 3D Field Simulator v15 Users Gu

18、ide 7.3 Maxwell v15Example (Transient) Translational Motion Create Band In Transient Solver, Band is an object that contains all moving objects. In other words it is a way how to tell Maxwell which objects are steady and which are moving. In this example there is one moving (translating) object: Mag

19、net. For translational type of motion Band cannot be a true surface object (cylinder). It must be a faceted object, such as Regular Polyhedron: To Create Band Select the menu item Modeler Grid Plane XY Select the menu item Draw Regular Polyhedron 1. Using Coordinate entry field, enter the center of

20、base X = 0, Y = 0, Z = -6, Press the Enter key 2. Using Coordinate entry field, enter the radius and height dX = 0, dY = 1.4, dZ = 12, Press the Enter key 3. Number of Segments: 36 4. Press OK To Change Attributes Select the resulting object from the history tree and goto Properties window 1. Change

21、 the name of the object to Band 2. Change the color of the object to Brown 3. Change the transparency to 0.8 Create Region Create Simulation Region Select the menu item Draw Region In Region window, 1. Pad all directions similarly: Checked 2. Padding Type: Percentage Offset 3. Value: 50 4. Press OK

22、7.3-#ANSYS Maxwell 3D Field Simulator v15 Users Guide 7.3 Maxwell v15Example (Transient) Translational Motion Assign Material: Magnet To Assign Magnet Material Select the object Magnet from the history tree, right click and select Assign Material In Select Definition window, 1. Type NdFe35 in the Se

23、arch by Name field 2. Select option Clone MaterialIn View/Edit Material window, 1. Name: Magnet_Material 2. Material Coordinate System Type: Cartesian Note: The direction of magnetization is determined by Unit Vector. For the Cartesian coordinate system the components of Unit Vector are X, Y and Z.

24、The values of X, Y and Z are 1, 0, 0 by default. For this example they have to be changed, because the magnet is magnetized in positive z-direction: 3. Magnetic Coercivity: Magnitude: -890000 X Component: 0 Y Component: 0 Z Component: 1 4. Select Validate Material 5. Press OK 7.3-#ANSYS Maxwell 3D F

25、ield Simulator v15 Users Guide 7.3 Maxwell v15Example (Transient) Translational Motion To Assign Material for Coil Select the object Coil from the history tree, right click and select Assign Material In Select Definition window, 1. Type copper in the Search by Name field 2. Select OK Assign Motion T

26、o Assign band Object Select the object Band from the history tree Select the menu item Maxwell 3D Model Motion Setup Assign Band In Motion Setup window, 1. Type tab Motion Type: Translation Moving Vector: Global:Z Positive 2. Data tab Initial Position: -4 cm Translation Limit 1. Negative: -4 cm 2. P

27、ositive: 4 cm 3. Mechanical tab Velocity: 1 cm_per_sec 4. Press OK 7.3-#ANSYS Maxwell 3D Field Simulator v15 Users Guide 7.3 Maxwell v15Example (Transient) Translational Motion Analysis Setup To Create Analysis Setup Select the menu item Maxwell 3D Analysis Setup Add Solution Setup In Solve Setup Wi

28、ndow, 1. General tab Stop time: 8 s Time step: 0.25 s 2. Save Fields tab Type: Linear Step Start: 0 s Stop: 8 s Step Size: 0.5 s Select the button Add to List 3. Press OK Save To Save File Select the menu item File Save Save the file with the name “Ex_7_3_Translational_Motion.mxwl” 7.3-#ANSYS Maxwel

29、l 3D Field Simulator v15 Users Guide 7.3 Maxwell v15Example (Transient) Translational Motion Validity Check To Check Validation of the case Select the menu item Maxwell 3D Validation Check Two warning messages are shown in Validation Check Details about warning can be sheen in Message Manager window

30、 Warning 1: Eddy effect settings may need revisiting due to the recent changes in the design. 1. In this example we are particularly interested to compute eddy currents induced in the solid copper coil. We have to make sure that the objects Coil is assigned for eddy current computation 2. Select the

31、 menu item Maxwell 3D Excitations Set Eddy Effects 3. In Set Eddy Effects window, Coil Eddy Effects: Checked Press OK 7.3-#ANSYS Maxwell 3D Field Simulator v15 Users Guide 7.3 Maxwell v15Example (Transient) Translational Motion Warning 2: Currently no mesh operations or data link have been created f

32、or the setup(s): Setup1. The initial mesh will be used. The initial mesh is usually not fine enough to achieve an accurate solution For demonstration purposes in this particular example we are interested to see the induced eddy currents at the cross section of the coil. Let us therefore refine the c

33、ross section by assigning appropriate mesh operations Select the object Coil from the history tree Select the menu item Maxwell 3D Mesh Operations Assign Inside Selection Length Based In Element Length Based Refinement window, Name: Length1 Restrict Length of Elements: Unchecked Restrict the Number

34、of Elements: Checked Maximum Number of Elements: 8000 Press OK 1.2.3.4. Select the menu item Maxwell 3D Validation Check for verification 7.3-#ANSYS Maxwell 3D Field Simulator v15 Users Guide 7.3 Maxwell v15Example (Transient) Translational Motion Analyze To Run Solution Select the menu item Maxwell

35、 3D Analyze All Plot Current Density Magnitude on Coil Terminal at time 2.5 s To Set Time= 2.5 s Select the menu item View Set Solution Context In Set View Context window, 1. Set Time to 2.5s 2. Press OK To Plot Current Density on Coil_Terminal Select the sheet Coil_Terminal from the history tree Se

36、lect the menu item Maxwell 3D Fields Fields J Mag_J In Create Field Plot window, 1. Press Done 7.3-#ANSYS Maxwell 3D Field Simulator v15 Users Guide 7.3 Maxwell v15Example (Transient) Translational Motion Plot Induced Current through the coil as a function of time To Define Parameter for Current Through Terminal (It) Select the menu item Maxwell 3D Fields Calculator In Fields Calculator window, 1. Select Input Quantity J 2. Select Input Geometry Select the radio button to Surface