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IntroductionThe Magnetic Valve includes a fixed and a rotating part. The rotating body has to move, as quickly as possible, to rest in one of the 2 possible stop positions. Driving current patterns are the input to generate suitable torques. The customer experienced different performances of the valve for different current patterns: sometimes he got strong bumps on the mechanic stops and failures of the valve behaviour. the customer decided to commit a simulation of the magnetic and dynamic behaviour of the valve, instead to build a prototype.Analysis GoalThe goal is ton achieve measure of the Magnetic Torque, as function of current and rotation angle within a parametric approachOwner:EnginsoftUsage Restrictions:Freely available for useIndustry:AutomotiveApplication:ValvePhysics:ElectromagneticsProduct(s)/Version:ANSYS-v10.1Geometry Type(s):SolidGeometry Format(s): Design ModelerModel Size:147070 Nodes, 105742 ElementsElement Type(s): Edge 117Estimated Demo Time:15 Minutes to show, 12 minutes running timeCustomer:Competition:Comsol,AnsoftChallenge:Free accurate Mesh, Parametric Model, Non LinearMagnetic AnalysisKey Features Used:Sphere of influence for meshing, BH Non Linear Curvedata import, Parametric AnalysisSteps and Points to Convey.Picture Guide.Start ANSYS Workbench Environment, and choose “New Geometry”.Importing of external geometrySet the desired length unit: meters.01) Click “File > Open > Import External Geometry File”.02) Click on “Generate” in order to confirm the importation of the geometry.The geometry regards a magnetic valve.Steps and Points to Convey.Picture Guide.Create a Parametric, Relative Rotation between two groups of bodies01) Create a local coordinate system (plane 4) by clicking on the “New Plane” icon in the tool bar.02) In “Details of Plane4 >. Type” choose from face in order to select the surface of interest. 03) Choose the space to the right of “Base Face” in Details of Plane4 and select the surface indicated in light blue in the plot at right.The local coordinate system “Plane 4” is now visible, centered on a face vertex04) In “Details of Plane4 >. Transform 1 (RMB)” insert an offset along X axis of –0.00825 m.05) In “Details of Plane4 >. Transform 1 (RMB)” insert an offset along Y axis of 0.0015 m.06) Click Generate to create Plane4Create another plane (Plane5).07) In “Details of Plane5 > Type” choose from plane. Base plane should be set to Plane4.08) In “Details of Plane5 >. Transform 1 (RMB)” insert a rotation about Z axis of 30°. 09) Click Generate to create Plane5.Steps and Points to Convey. Picture Guide.The local coordinate system “Plane 5” is now visible.10) From the tool bar menu, select “Tools > Freeze”.The freezing operation is indicated when bodies are displayed with transparency.11) From the tool bar menu, select “Create > Body Operation” set “Type” to “Move” click on the box to the right of Bodies.12) Select the bodies highlighted at right (use the Ctrl button to select multiple entities) and click Apply.Steps and Points to Convey.Picture Guide.13) In “Details of BodyOp1” choose the box to the right of “Source Plane” and pick on Plane4 in the Tree Outline.14) In a similar fashion, set “Destination Plane” to Plane5.Then click on “Generate” to move the parts as shown at right.ENCLOSURE definition01) From the tool bar menu, select “Tools >Enclosure” in order to insert a control volume cylindrically shaped and aligned to Y axis. Set the Cushion to 0.0375 m and set “Merge Parts?” to “Yes”.02) Click Generate to create the enclosureIn the “Outline” tree the just created enclosure is now visible.Steps and Points to Convey Picture GuideEnclosure is visible in the “Model View”window.CREATE the WINDING COIL01) In the Tree Outline, Open “1 Part, 7 Bodies > Part”. RMB on the last Solid in the list and choose “Hide Body” in the drop down menu. This will allow access to the surfaces of the imported geometry for forthcoming picking operations.02) Create a new plane (Plane6)03) In “Details of Plane6 >. Type” choose “From Face”.04) Click on the box to the right of “Base Face” and select the surface shown at right.05) In “Details of Plane6 >. Transform 1 (RMB)” insert an offset along Z axis of –0.0231 m.Click on Generate to create Plane6.06) With Plane6 now active, go to the tool bar and choose “New Sketch”.07) Select “Sketch1” in the “Tree Outline”.Steps and Points to Convey Picture Guide Sketching mode for winding coil generation08) Pick the Sketching tab at the bottom of theTree Outline09) Select “Circle” in the “Draw” window andchoose the center (origin of Plane6) and anarbitrary poin some distance away from thecenter to create a circle.10) Pick the Dimensions button at the bottom ofthe Sketching Toolboxes pane and choose“Radius”.11) Click on the circle and another arbitrarylocation for the radial dimension marker.12) In “Details of Sketch1”, modify the radiusR1 to be 0.00775 m.The sketch is now visible in the “Graphics”window.13) From the tool bar select “Concept > LineFrom Sketches”. Choose the circle and clickApply in the box to the right of “Base Objects”in “Details of Line1”. “Operation” should be setto “Add Material”.Click Generate.14) Choose the Line Body in the Tree Outline.15) In “Details of Line Body” set:•“Winding Body > Yes”•“Number of Turns” = 1•“CS Length” = 0.022 m•“CS Length” = 0.00375 mSteps and Points to ConveyPicture Guide16) From the tool bar, select “View > Show Cross Sections Solids”. The new winding body should appear as it does in the figure to the right.ANGLE as PARAMETER01) In the “Tree Outline” select “Plane5”02) Make the rotation about Z axis as parameter by clicking on the box to the left of “FD1, Value 1”.03) Rename the parameter as “angle”.Steps and Points to Convey.Picture Guide.04) From the tool bar, select “Tools > Options>Common Settings>Geometry Import”. Remove “DS” from the field to the right of “Personal Parameter Key” to remove the DS prefix naming convention restriction for importing parameters. Click OK.GO IN SIMULATIONIn the “[Project]” window, select “New Simulation”.In the “[Simulation]” window, the “Outline” tree should be as in figure.Steps and Points to ConveyPicture GuideMaterials Properties DefinitionSelect “Data” in the tool bar to open the “[Engineering Data]” window.Materials Properties Definitionchange defaults of STRUCTURAL STEEL01) Select “Structural Steel” and click on “Add/Remove Properties” in the “Electromagnetics” field and unselect the following items:- “Relative Permeability” - “Resistivity”02) Check the box to the left of “B-H curve” and click OK.03) Say “Yes” to the “Remove Material Properties” box that appears.04) Open excel file “bh1.xls” and copy the two data columns (highlight them with the mouse cursor and type Cntl-C).Steps and Points to ConveyPicture Guide05) Click the icon depicting an xy plot to the right of “B-H Curve”06) LMB on the 2 (second row) of the “Magnetic Flux Density vs. Magnetic Field Intensity” table and press “Ctrl +V” to paste the two column data from the .xls file.07) Click on the B-H Curve icon at the lower right.The curve should appear as shown at right.NEW Material definition IRONRMB on “Materials (2)” in the tree and choose “Insert New Material”. RMB on “New Material”, choose Rename and change the name of the new material to Iron. Define BH data as before but this time use data from “bh2.xls” file.NEW Material definition NEODYMIUM01) Define a New material named “Neodymium”.02) Among Electromagnetics properties let active just: “Linear Hard Material”: 03) Insert the following data:• Cohercive Force: 7.9577 e5 A/m • Residual Induction 1.2 T01) Return to the Simulation Tab02) In the Outline Tree, open Geometry>Part and use the Cntl button to select both of the RIC9512_105 items. The parts should be highlighted as shown at right.03) In Details of “Multiple Selection”, changematerial from “Structural Steel” to “Iron”Steps and Points to ConveyPicture Guide04) Select the part shown at right.05) Change material from “Structural Steel” to “Neodymium”MESH01) Select the coil support solid (see figure)02) RMB on “Mesh” on the tree to insert a sizing control: Element Size 2e-303) Insert another sizing control , 1e-3, referred to 5 bodies as in the following picture. It may help to hide the 4th solid (the “air enclosure) in the Outline tree to simplify selecting these parts.Steps and Points to ConveyPicture Guide5 bodies for sizing setting n.204) In the Outline tree, RMB on Model and insert a “Coordinate Systems” branch. RMB on the Coordinate Systems branch and insert (define) a new Coordinate System. Choose “Origin” in the Details of “Coordinate System” pane, select the surface shown at right, and click Apply.05) RMB on Mesh in the Outline to insert a third sizing control:For “Type”, choose “Sphere of Influence”• Sphere Center: Coordinate System (defined just before) • Radius 1.5e-2 • Element size 5e-4Areas to be applied are the following (10 areas)Steps and Points to ConveyPicture Guide10 Areas where to apply the Sphere of Influence sizing control06) Click on Mesh -> Preview MeshThe Mesh should result as in figure, if the “Air” solid enclosure body is hideLOADSSet the Conductor Current value in details window related to “Conductor Winding Body”: 1000 ABOUNDARY CONDITIONSRMB on Environment in the tree and insert a Magnetic Flux Parallel object. Use the Cntl button to select the 3 exterior surfaces of the enclosure and click Apply.Steps and Points to Convey.Picture Guide.POSTPROCESSING SETTINGS01) Insert under the “Solution” tree the following output requests: • Total Flux Density • Total Flux Intensity 02) Select 3 bodies as in figure03) Insert a “Directional Force/Torque” output request with details:• In Details of “Directional Force/Torque” pane, change “Global Coordinate System” to “Coordinate System” (this is the user-defined coordinate system centered on the top surface of the permanent magnet).• Set Orientation to Y Direction (rotation axis)04) repeat Directional Force/Torque Request for both X and Z axis direction05) By a right click under the Solution Tree Insert a “Solution Information” request to monitor the run during the solutionSOLVE01) Highlight the Environment tree tosee/check all Boundary & Loads previously defined.02) Click on the “SOLVE” Icon to launchthe run.Solution times takes about 12 minutes on a 2.8 Ghz single processor 32bit PCSteps and Points to ConveyPicture GuideREVIEW RESULTS01) See the Total Flux of Magnetic results 02) Set up a Vector Image of the MagneticField03) After Vector Image settings show a Vector Plot of Magnetic Field03)See the Magnetic Force distribution, Yaxis direction, on the requested parts. 04)The same for X, Z directions05)Activate the view from Y Global Axis06)Define a “Slice Plane”07)Draw the slice plane trace at nearlyalong the Y global direction08)View from the X Global direction09)Activate “show elements” and show themagnetic fieldSteps and Points to Convey Picture GuideSET UP A PARAMETRIC ANALYSIS01) Click on “Model”02) Click on CAD Parameters Detail toactivate the “angle” as a parameter. Thiswill be the first INPUT parameter.03) Click on Environment and Duplicate byright click04) Activate the Conductor Current Value asparameter. This is the second INPUTparameter n.2.05) Activate the Torque value in Y directionas OUTPUT parameter (ThirdParameter)06)Click on “Solution” of Environment 2and then click on Parameter Manager 07)Set up many cases as you like, forexample with 4 current values, 3 values other than the previously solved.。
基于ANSYS Workbench平台的电机电磁噪声仿真分析电动机与发电机等电力设备的噪声起因很多，有电磁振动噪声、机械噪声及流致噪声等等，本文通过ANSYS公司的官方案例为操作背景，详细介绍如何将作用在定子上的瞬态电磁力作为结构谐响应分析的载荷计算振动噪声。
1.电磁模型建立与分析如图1所示为一个电机模型，电机的额定输出功率为550W，额定电压为220V，极对数为4，定子齿数为24个，转子的转速为1500rpm，求电磁振动产生的噪声大小。
本算例使用的模块如下：RMxprt模块：建立电机类型；Maxwell模块：2D瞬态电磁场计算；Structural模块：3D谐响应分析计算；Acoustics ACT模块：噪声计算注：Acoustics ACT模块需要单独安装，请用户到官方网站上自行下载。
图1电机模型电机的电路模型如图2所示。
图2电机电路模型1）启动Workbench。
在Windows XP下单击“开始”→“所有程序”→ANSYS15→Workbench 15命令，即可进入Workbench主界面。
2）保存工程文档。
进入Workbench后，单击工具栏中的按钮，将文件保存为“zhendongzaosheng.wbpj”，单击Getting Started窗口右上角的（关闭）按钮将其关闭。
3）双击Toolbox→Analysis System→RMxprt模块建立项目A，如图3所示。
4）双击项目A中的A1栏进如RMxprt电机设置平台，如图4所示。
图3RMxprt模块图4RMxprt平台5）依次选择菜单RMxprt→Machine Type，在弹出的电机类型选择对话框中单击Generic Rotating Machine选项，单击OK按钮，如图5所示。
6）单击Project Manager→RMxprt→Machine选项，在下面出现属性设置对话框中作如下设置：在Source Type栏中选择AC选项；在Structure栏中选择Inner Rotor选项；在Stator Type栏中选择SLOT_AC选项；在Rotor Type栏中选择PM_INTERIOR选项，如图6所示。
第18章 电磁场分析 在电磁学里，电磁场是一种由带电物体产生的物理场，处于电磁场的带电物体会感受到电磁场的作用力。
★18.1 电磁场基本理论电磁场理论由一套麦克斯韦方程组描述，分析和研究电磁场的出发点就是对麦克斯韦方程组的研究。
18.1.1 麦克斯韦方程组麦克斯韦方程组实际上是由4个定律组成，分别是安培环路定律、法拉第电磁感应定律、高斯电通定律（简称高斯定律）和高斯磁通定律（亦称磁通连续性定律）。
1. 安培环路定律无论介质和磁场轻度H 的分布如何，磁场中的磁场强度沿任何一条闭合路径的线积分等于穿过该积分路径所确定的曲面的电流总和，这里的电流包括传导电流（自由电荷产生）和位移电流（电场变化产生），利用积分表示为：()D Hdl J dS tΓΩ∂=+∂∫∫∫ （18-1）ANSYS Workbench 17.0有限元分析从入门到精通 式中，J 为传导电流密度矢量（A/m 2），D t∂∂为位移电流密度，D 为电通密度（C/m 2）。
2. 法拉第电磁感应定律 闭合回路中的感应电动势与穿过此回路的磁通量随时间的变化率成正比，利用积分表示为：(B Edl J dS tΓΩ∂=−+∂∫∫∫ （18-2） 式中，E 为电场强度（V/m ），B 为磁感应强度（T 或Wb/m 2）。
3. 高斯电通定律在电场中，不管电解质与电通密度矢量的分布如何，穿出任何一个闭合曲面的电通量等于已闭合曲面所包围的电荷量，这里的电通量也就是电通密度矢量对此闭合曲面的积分，积分形式表示为：v S DdS dv ρ=∫∫∫∫∫ （18-3）式中，ρ为电荷体密度（C/m 3）。
4. 高斯磁通定律在磁场中，不论磁介质与磁通密度矢量的分布如何，穿出任何一个闭合曲面的磁通量恒等于零，这里的磁通量即为磁通量矢量对此闭合曲面的有向积分，用积分形式表示为： 0SBdS =∫∫ （18-4） 式（18-1）~式（18-4）还分别有自己的微分形式，也就是微分形式的麦克斯韦方程组，分别对应式（18-5）~式（18-8）：D H J t ∂∇×=+∂ （18-5） B E t ∂∇×=∂ （18-6）D ρ∇= （18-7）0B ∇=（18-8）在电磁场计算中，经常对上述这些偏微分进行简化，以便能够用分离变量法、格林函数等求得电磁场的解，其解的形式为三角函数的指数形式以及一些用特殊函数表示的形式。
ANSYS电磁场分析例子我们将考虑一个简单的电磁场问题，即一个平行板电容器的电场分布。
这个问题可以很容易地通过ANSYS进行建模和求解。
首先，我们需要进行几何建模。
在ANSYS的建模界面中，我们可以使用几何建模工具来创建一个具有平行板结构的电容器。
我们可以定义平行板的尺寸、间距以及材料属性等。
接下来，我们需要定义边界条件。
在这个问题中，平行板上的电势是已知的。
我们可以在边界条件中指定平行板上的电势值，然后在求解过程中，ANSYS将根据这些边界条件计算电势分布。
然后，我们需要设置求解器选项。
ANSYS提供了多种求解器选项，包括有限元法、有限差分法等。
我们可以根据我们的具体问题选择合适的求解器。
接下来，我们需要应用材料属性。
我们可以在材料库中选择合适的材料，并将其应用于电容器的几何模型中，以便ANSYS可以根据这些材料属性计算电场分布。
最后，我们可以运行求解器并分析结果。
一旦求解器完成计算，我们可以在ANSYS的后处理界面中查看电场分布结果。
ANSYS提供了丰富的后处理工具，包括可视化和数据分析工具，可以帮助我们更好地理解和解释电场分布结果。
通过以上步骤，我们可以使用ANSYS进行电磁场分析，并得到电场分布结果。
根据这些结果，我们可以评估电容器的性能，例如电势分布、电场强度等。
这些信息对于设计和优化电容器以及解决其他电磁问题非常有价值。
总结起来，ANSYS电磁场分析是一种强大的工具，可以用于解决各种电磁问题。
通过几何建模、边界条件设置、求解器选项设置、应用材料属性和结果分析等步骤，我们可以使用ANSYS获得准确和可靠的电场分布结果，为问题的解决和优化提供有力支持。
