ANSYS Workbench 9.0 Electromagnetics Paul Lethbridge

Workbench Electromagnetics Contents Workbench Electromagnetics Workbench Emag Roadmap Design Modeler Enclosure Symmetry Winding Bodies Winding Tool Simulation

Workbench Emag Roadmap LF Emag capability will be exposed over several release cycles: 3D Magnetostatics (9.0) 3D Current conduction (10.0) 3D Electrostatics Circuit elements Time transient & 2D Workbench v9.0 is the first release with electromagnetic analysis capability. Support solid and stranded (wound) conductors Automated computations of force, torque, inductance, and coil flux linkage. Easily set up simulations to compute results as a function of current, stroke, or rotor angle. Workbench Emag capability is mapped to & accessed via: ANSYS Emag (stand alone or enabled task) ANSYS Multiphysics license keys.

Workbench Emag Markets Target markets: Solenoid actuators Permanent magnet devices Sensors Rotating Electric machines Synchronous machines DC machines Permanent magnet machines

Workbench Electromagnetics Contents Workbench Electromagnetics Workbench Emag Roadmap Design Modeler Enclosure Symmetry Winding bodies Winding Tool Simulation

Enclosure & Fill Tools Design Modeler (DM) includes two features to allow a user to create a volumetric “field” body associated with a solid model. Enclosure tool: Released at 8.0. This tool is used to completely enclose the bodies of a model in a material typically required for an Emag analysis. Fill Tool: Released at 9.0 (Beta at 8.1). Similar function to enclosure, but only fills interior cavities. The Enclosure tool is used to enclose the bodies of a model in a material typically required for an Emag analysis. If a full model is used, symmetry planes will slice the model and discard the unused geometry, then enclose the symmetry model with an enclosure Example of a hemispherical enclosure around an electromagnet

Fill Feature The Fill feature create a new frozen body to fill the space occupied by a hole or cavity. Useful for interior cavity electromagnetic applications.

Enclosure Symmetry Feature: The Enclosure feature now supports symmetry models when the enclosure shape is a box or a cylinder: Up to 3 three symmetry planes can be specified. Full or partial models can be included in the Enclosure. During the model transfer from DesignModeler to Simulation, the enclosure feature with symmetry planes forms two kinds of named selections: Open Domain Symmetry Plane The Enclosure tool is used to enclose the bodies of a model in a material typically required for an Emag analysis. If a full model is used, symmetry planes will slice the model and discard the unused geometry, then enclose the symmetry model with an enclosure

Workbench Electromagnetics Contents Workbench Electromagnetics Workbench Emag Roadmap Design Modeler Enclosure Symmetry Winding bodies Winding Tool Simulation

Winding Bodies & Tool Feature: Design Modeler (DM) includes two new tools to allow a user to easily create current carrying coils: Winding Bodies: Used to represent wound coils for source excitation. The advantage of these bodies is that they are not 3D CAD objects, and hence simplify modeling/meshing of winding structures. Upon “attach to Simulation”, Winding Bodies are assigned as Conductor bodies. Winding Tool: Used to create more complex coils for motor windings. The Winding Tool uses a Worksheet table format to drive the creation of multiply connected Winding Bodies. Or a user can read in a text file created by MSExcel. Benefits: Very easy to use, rapid creation of coil windings. Winding Bodies: Used to represent wound coils for source excitation. They are defined from line bodies. The advantage of these bodies is that they are not 3D CAD objects, and hence simplify modeling/meshing of winding structures. The winding bodies are easy to use representations of SOURC36 elements.

Winding Bodies Tangent orientation vector (blue arrow) defines direction of current. Winding cross-section displayed A line body can be promoted to a winding body. Turns and cross-section (CS) dimensions are entered

Winding Tool Complex coil windings may be created using the Winding Tool: The Winding Tool inserts a “Winding#” into the model tree. A “Details” view is used for geometric placement.

Winding Tool Each Winding consists a number of related Winding Bodies. The related Winding Bodies are shown in the Parts/Bodies branch: Winding Bodies

Winding Table File Each Winding has a Winding Table File associated with it. The Winding Table File can be created directly in DM The Winding Table File can be exported to or imported from a text file. Each row corresponds to a created Winding Body

Winding Table File The Winding Table File can be exported to or imported from a text file.

Winding Tool Example Winding 1 highlighted with rotor Complete DC Motor model

Winding Options Coils may have different radii between IN & OUT slots Multiple coils may be stacked in the same slot

Winding Options - Skew A skew angle may be identified for the coil winding slots Many motor designs employ a skewed coil form.

Winding Slot Clash Detection Winding Tool automatically detects if the coil clashed with another part and warns the user

Contents Workbench Electromagnetics Design Modeler Simulation Workbench Emag Roadmap Design Modeler Enclosure Symmetry Winding bodies Winding Tool Simulation Tools Layout Material Properties Air Gap Mesh Sizing Conductors Solution

Simulation Tools Layout Electromagnetic Toolbar Simulation Environment: Emag boundary conditions Conductor source excitation Solution Results Voltage Current Density Field Force Torque Inductance Flux linkage Solid Conductor: Voltage Current Density Anything else: Field Force Torque Inductance Flux linkage

Emag Simulation Wizard Interactively walks a user through required analysis steps.

Winding Body Transfer in Simulation Winding bodies are automatically assigned to conductor bodies. From the Winding Tool, each Phase Winding is assigned as a unique conductor. In this example, Conductor A consists of 2 winding bodies.

Material Property Support Both linear & nonlinear Emag materials are supported by Engineering Data: Soft materials (Steel, iron, etc.) Constant (isotropic) Laminated (orthotropic) Linear/nonlinear (single B-H curve) Hard materials (NdFeB, SmCo, Alnico) Linear Nonlinear Library of 35 BH curves provided 35 common materials

Materials – BH Curve Library

Materials – User BH Curves BH curves with up to 500 data points are supported

Materials - Permanent Magnets Coordinate systems are used to align the polarization axis of a magnet. Cartesian and Radial Magnetization are supported.

Air Gap Mesh Sizing Requirement: . In an electromagnetics analysis models typically include narrow gaps between parts such as rotors and stators. It is important to have a refined mesh in these gaps. Feature: Air Gap Mesh sizing. As for other mesh controls, air gaps are assigned under Advanced Controls in the Mesh Detail. Benefits: Easy to use mesh refinement, resulting in more accurate analysis results. Feature: Air Gap Mesh sizing. As for other mesh controls, air gaps are assigned under Advanced Controls in the Mesh Detail. Face pairs containing the air gap are automatically located. Gap size face pairs are identified on model for easy verification. Gap aspect ratio and gap mesh density may be selected per pair.

Air Gap Mesh Sizing

Conductor Objects Conductor Objects identify conductors for excitation, inductance, and Post processing. Can be scoped to solid bodies (solid conductors), or Winding Bodies (wound coils) Excitation: Supports voltage and current loading for solid conductors. Current and phase angle are supported for Winding Bodies.

Solution Results

Vector & Contour Plots Vector / Contour is selected in the Solution objects “Definition” or Results toolbar

Vector Plots Vector plot arrow scale, 2D/3D arrows and arrow density can be defined allowing excellent visualization of the electromagnetic field

Inductance & Flux Linkage Solution branch can insert Inductance & Flux linkage post processing calculations. Self and mutual inductance is computed.

Parameter Sweeps The Emag analysis can be fully parameterized so that a user can easily extract force or torque versus rotor position etc.

Parameter Sweeps Graph of results automatically created.

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