e mag motion documentation
DESCRIPTION
LLTRANSCRIPT
Title Slide Header 28 pt. Arial Black*
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Overview
A beta feature capability at V12 allows for solving Emag-motion coupled static and time-transient problems.
The moving body (Armature) is assumed to be rigid and is modeled by a single mass element.
The Emag domain consists of two independent multibody parts
An Armature (Moving) part
A Stationary (Stator) part
*
New SOLID236/237 Emag elements
*
Introduction
-The motion coupled emag capability assumes a lumped mass approach for the Armature (moving part).
-The armature & stator components must be meshed separately and the interface must be in the air region. Restrictions apply (See Ladder Mesh Section)
-AZ dof continuity is maintained by using program-generated constraint equations on the interface nodes
-Valid for static and transient analyses
© 2008 ANSYS, Inc. All rights reserved.
*
-The lumped mass is associated with the armature
-The emag PDE and motion PDE are solved in a coupled manner
- During a transient analysis, the position of the armature is set by the computed/imposed displacement/rotation of the Mass node. The armature mesh is not physically moved. Movement is accounted for by changing terms of the constraint equations at the interface.
- For electric loading, computed force/torque on the armature is transferred to the lumped mass node
© 2008 ANSYS, Inc. All rights reserved.
*
Ladder Mesh
The Armature and Stator interface is restricted to a specific meshing pattern
In the direction of motion, the element divisions may be non-uniform and independent (Armature and Stator meshes)
In the direction orthogonal to motion, the element divisions must exactly match between the Armature and Stator meshes.
The interface surface must reflect a structured quad mesh
© 2008 ANSYS, Inc. All rights reserved.
*
*
Rotor interface: Structured mesh shows quad surfaces from underlying brick Elements. Element divisions around the circumference may be non-uniform. Divisions along the machine axis must align with the Stator mesh divisions.
Interface surface
Machine Axis
*
*
ANSYS, Inc. Proprietary
Treating Periodic/Anti-Periodic Surfaces
For Release 12, scope the lower-angle surfaces to the “Periodic High” entry,
And the higher-angle surfaces to the “Periodic Low” entry. (This is a bug that will be addressed)
Lower Angle
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Commands
ARMCNTRL,key,IntName
Sets controls for a motion coupling interface between an armature(moving body) and a stationary body.
Key
IntName
Name of the interface to be deleted. Valid only if key = dele option
© 2008 ANSYS, Inc. All rights reserved.
*
Commands
ARMINT,IntName,Lcsys,Armdir,StatComp,ArmComp,MassNode,ForComp,IntType,MapTol,SymMult
Defines a motion coupling interface between an armature(moving body) and a stationary body.
IntName
Lcsys
Local coordinate system number associated with the interface( see CSYS command for valid numbers). Coordinate systems may be defined with the LOCAL command. The origin of the Lcsys coordinate system is used for torque computations.
© 2008 ANSYS, Inc. All rights reserved.
*
Lcsys cont’d
The node used to represent the lumped mass of the armature(MassNode) should be rotated(NROTAT command) into the Lcsys coordinate system. Lcsys must be cartesian or cylindrical only.
Armdir
The direction of motion of the armature with respect to Lcsys. Enter 1,2, or 3 only. If Lcsys is cylindrical Armdir must be set to 2.
© 2008 ANSYS, Inc. All rights reserved.
*
Commands
StatComp
The component name for the stationary interface elements. The element must be 8-noded quad (MESH200 created using ESURF)
ArmComp
The component name for the moving armature interface elements. The element must be 8-noded quad( MESH200 created using ESURF)
© 2008 ANSYS, Inc. All rights reserved.
*
Commands
MassNode
The node number associated with a lumped mass representation of the armature. Use this node to define a lumped mass element( MASS21 ).
ForComp
The node component representing the set of nodes used to compute electromagnetic force/torque on the armature body.
© 2008 ANSYS, Inc. All rights reserved.
*
Commands
IntType
The interpolation expression used in defining the constraint equations between the armature and stationary body interface nodes. Currently the only choice is 0.
MapTol
A tolerance used for sorting the interface nodes. The sorting is used for efficient mapping between the armature interface nodes and the stationary body interface nodes. A positive value is a relative tolerance and is dimensionless. A negative value is an absolute tolerance and has the dimension of length.
© 2008 ANSYS, Inc. All rights reserved.
*
Commands
SymMult
Symmetry multiplier for computed electromagnetic force/torque. The computed force/torque is multiplied with this number before it is applied to the MassNode as a load. Useful when using sector models( periodic or anti-periodic boundary conditions). The default is 1.0 and is good enough for full models( one sector of 360 degrees).
© 2008 ANSYS, Inc. All rights reserved.
*
The Emag-motion capability presently supports Shared memory Parallel (SMP) solution.
Our intent is to support Distributed Memory Parallel (DMP) by the time of the R12 release.
DMP should give the best scaling.
© 2008 ANSYS, Inc. All rights reserved.
*
*
© 2008 ANSYS, Inc. All rights reserved.
*
Configuring Workbench
Workbench can be configured to run time transient Emag problems as well as motion-coupled problems.
The 236/237 elements types are activated using the Variable Manager
Command Snippets can be used to supplement the current workbench features to run transient problems.
© 2008 ANSYS, Inc. All rights reserved.
*
ANSYS, Inc. Proprietary
Configuring inside Workbench
Activating 23X elements
The new 233/237 element may be activated in Workbench by setting a Variable
Name in the Workbench Variable Manager.
© 2008 ANSYS, Inc. All rights reserved.
*
Geometry Folder
For each steel part, assign AZ-VOLT degree of freedom option and specify
time-integrated VOLT potential. Steel resistivity may be defined here or using
Engineering Data (Resources). Other keyopt settings may be used depending
on the physics requirements in the conducting domains.
© 2008 ANSYS, Inc. All rights reserved.
*
Magnetostatic Environment Folder - Transient
Use this first snippet to configure the problem for transient analysis. Also, apply
Any constraints to the VOLT dof in the eddy current regions (Steel). Use the
OUTRES command to store velocity and acceleration terms if desired for the
Mass21 element.
*
© 2008 ANSYS, Inc. All rights reserved.
*
*
*
*
© 2008 ANSYS, Inc. All rights reserved.
*
*
*
*
Overview
A beta feature capability at V12 allows for solving Emag-motion coupled static and time-transient problems.
The moving body (Armature) is assumed to be rigid and is modeled by a single mass element.
The Emag domain consists of two independent multibody parts
An Armature (Moving) part
A Stationary (Stator) part
*
New SOLID236/237 Emag elements
*
Introduction
-The motion coupled emag capability assumes a lumped mass approach for the Armature (moving part).
-The armature & stator components must be meshed separately and the interface must be in the air region. Restrictions apply (See Ladder Mesh Section)
-AZ dof continuity is maintained by using program-generated constraint equations on the interface nodes
-Valid for static and transient analyses
© 2008 ANSYS, Inc. All rights reserved.
*
-The lumped mass is associated with the armature
-The emag PDE and motion PDE are solved in a coupled manner
- During a transient analysis, the position of the armature is set by the computed/imposed displacement/rotation of the Mass node. The armature mesh is not physically moved. Movement is accounted for by changing terms of the constraint equations at the interface.
- For electric loading, computed force/torque on the armature is transferred to the lumped mass node
© 2008 ANSYS, Inc. All rights reserved.
*
Ladder Mesh
The Armature and Stator interface is restricted to a specific meshing pattern
In the direction of motion, the element divisions may be non-uniform and independent (Armature and Stator meshes)
In the direction orthogonal to motion, the element divisions must exactly match between the Armature and Stator meshes.
The interface surface must reflect a structured quad mesh
© 2008 ANSYS, Inc. All rights reserved.
*
*
Rotor interface: Structured mesh shows quad surfaces from underlying brick Elements. Element divisions around the circumference may be non-uniform. Divisions along the machine axis must align with the Stator mesh divisions.
Interface surface
Machine Axis
*
*
ANSYS, Inc. Proprietary
Treating Periodic/Anti-Periodic Surfaces
For Release 12, scope the lower-angle surfaces to the “Periodic High” entry,
And the higher-angle surfaces to the “Periodic Low” entry. (This is a bug that will be addressed)
Lower Angle
*
Commands
ARMCNTRL,key,IntName
Sets controls for a motion coupling interface between an armature(moving body) and a stationary body.
Key
IntName
Name of the interface to be deleted. Valid only if key = dele option
© 2008 ANSYS, Inc. All rights reserved.
*
Commands
ARMINT,IntName,Lcsys,Armdir,StatComp,ArmComp,MassNode,ForComp,IntType,MapTol,SymMult
Defines a motion coupling interface between an armature(moving body) and a stationary body.
IntName
Lcsys
Local coordinate system number associated with the interface( see CSYS command for valid numbers). Coordinate systems may be defined with the LOCAL command. The origin of the Lcsys coordinate system is used for torque computations.
© 2008 ANSYS, Inc. All rights reserved.
*
Lcsys cont’d
The node used to represent the lumped mass of the armature(MassNode) should be rotated(NROTAT command) into the Lcsys coordinate system. Lcsys must be cartesian or cylindrical only.
Armdir
The direction of motion of the armature with respect to Lcsys. Enter 1,2, or 3 only. If Lcsys is cylindrical Armdir must be set to 2.
© 2008 ANSYS, Inc. All rights reserved.
*
Commands
StatComp
The component name for the stationary interface elements. The element must be 8-noded quad (MESH200 created using ESURF)
ArmComp
The component name for the moving armature interface elements. The element must be 8-noded quad( MESH200 created using ESURF)
© 2008 ANSYS, Inc. All rights reserved.
*
Commands
MassNode
The node number associated with a lumped mass representation of the armature. Use this node to define a lumped mass element( MASS21 ).
ForComp
The node component representing the set of nodes used to compute electromagnetic force/torque on the armature body.
© 2008 ANSYS, Inc. All rights reserved.
*
Commands
IntType
The interpolation expression used in defining the constraint equations between the armature and stationary body interface nodes. Currently the only choice is 0.
MapTol
A tolerance used for sorting the interface nodes. The sorting is used for efficient mapping between the armature interface nodes and the stationary body interface nodes. A positive value is a relative tolerance and is dimensionless. A negative value is an absolute tolerance and has the dimension of length.
© 2008 ANSYS, Inc. All rights reserved.
*
Commands
SymMult
Symmetry multiplier for computed electromagnetic force/torque. The computed force/torque is multiplied with this number before it is applied to the MassNode as a load. Useful when using sector models( periodic or anti-periodic boundary conditions). The default is 1.0 and is good enough for full models( one sector of 360 degrees).
© 2008 ANSYS, Inc. All rights reserved.
*
The Emag-motion capability presently supports Shared memory Parallel (SMP) solution.
Our intent is to support Distributed Memory Parallel (DMP) by the time of the R12 release.
DMP should give the best scaling.
© 2008 ANSYS, Inc. All rights reserved.
*
*
© 2008 ANSYS, Inc. All rights reserved.
*
Configuring Workbench
Workbench can be configured to run time transient Emag problems as well as motion-coupled problems.
The 236/237 elements types are activated using the Variable Manager
Command Snippets can be used to supplement the current workbench features to run transient problems.
© 2008 ANSYS, Inc. All rights reserved.
*
ANSYS, Inc. Proprietary
Configuring inside Workbench
Activating 23X elements
The new 233/237 element may be activated in Workbench by setting a Variable
Name in the Workbench Variable Manager.
© 2008 ANSYS, Inc. All rights reserved.
*
Geometry Folder
For each steel part, assign AZ-VOLT degree of freedom option and specify
time-integrated VOLT potential. Steel resistivity may be defined here or using
Engineering Data (Resources). Other keyopt settings may be used depending
on the physics requirements in the conducting domains.
© 2008 ANSYS, Inc. All rights reserved.
*
Magnetostatic Environment Folder - Transient
Use this first snippet to configure the problem for transient analysis. Also, apply
Any constraints to the VOLT dof in the eddy current regions (Steel). Use the
OUTRES command to store velocity and acceleration terms if desired for the
Mass21 element.
*
© 2008 ANSYS, Inc. All rights reserved.
*
*
*
*
© 2008 ANSYS, Inc. All rights reserved.
*
*
*