How to use the
table of contents:
To see the documentation
for a topic, select it from
the list.
To see a more detailed
listing of a topic, select
the Expand button beside
it.
To learn more about the
online help system,
select About Help.
Maxwell EMSS — Table of Contents
EMSS Circuit Equivalents
Parametric Tables
Inductance and Capacitance Matrices
General Procedure
Equivalent Circuit Window
Model
Format
Use Model Picture
Notes
Table File
Type
Matrix
Transformer
Linear Motion
Rotational Motion
Lookup Table
Units
Depth
Interpolate
Linear
Bezier on Last
Bezier on All
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Top
Field Type
Conductor Data
Conductor
Turns
Resistance
Current
About Help
Index
Maxwell Online Help System
Copyright © 1988-2001 Ansoft Corporation
How to use the
table of contents:
To see the documentation
for a topic, select it from
the list.
To see a more detailed
listing of a topic, select
the Expand button beside
it.
To learn more about the
online help system,
select About Help.
Maxwell EMSS — Table of Contents
Extra Ports
Extrapolate
Linear
Periodic
Halfperiod
Constant
Even
Odd
Nominal Matrix
Scale By
Specifying the Matrix Files
Coupling Limits
Modeling Motors in EMSS
EMSS Motor Setup
Induction Motor Parameters
Permanent Magnet Synchronous Motor Parameters
Reluctance Motor Parameters
Synchronous Generator Parameters
Motor Performance Window
Axis Format
Plot Format
Export dq0 Circuit
Change Motor Parameters
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Top
About Help
Index
Maxwell Online Help System
Copyright © 1988-2001 Ansoft Corporation
Topics:
EMSS Equivalent Circuits
Parametric Tables
Inductance and Capacitance Matrices
General Procedure
Maxwell Equivalent Circuit
Window
Nominal Matrix
EMSS – Equivalent Circuits
EMSS Equivalent Circuits
Maxwell Electro-Mechanical Simulation Software (EMSS), is used in conjunction with
Ansoft’s Schematic Capture program and Maxwell 2D to add mechanical components
and components with time-varying parameters to your circuits.
When you purchase EMSS, you can generate Maxwell Spiceand Saber equivalent circuits from Maxwell software solutions. In addition, mechanical components augment the
Schematic Capture Add menu.
Parametric Tables
The parametric analysis solved in the field simulator must be set up carefully in order to
create a valid circuit model.
•
•
For the two actuator models, add motion as a constraint in the geometry, and include
it as a variable in the parametric table. Also include force or torque in the table.
Use Data/Sweep to add the independent variables (current, position, rotation, and so
forth) so that they form nested families of curves. For example, given the independent
variables i1 and i2 , sweep i1 through its range of values. Next, for each value of i1,
sweep i2 through its range.
Inductance and Capacitance Matrices
For magnetostatic models, EMSS assumes that inductance is a function of input current,
so create a current through each conductor which can be added to the parametric table
and varied. For electrostatic models, EMSS uses the capacitance matrices, and you need
to set up a voltage source for each conductor in these models.
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Contents
Index
Maxwell Online Help System
5
Copyright © 1988-2001 Ansoft Corporation
Topics:
EMSS Equivalent Circuits
General Procedure
Maxwell Equivalent Circuit
Window
Nominal Matrix
EMSS – Equivalent Circuits
General Procedure
> To use an EMSS equivalent circuit:
1. In Maxwell 2D, create a parametric table with the variations you want to include in the
exported model.
2. If you are running a motor simulation, set up the motor.
3. Run the variable field simulation, making sure you solve an electrostatic or magnetostatic problem.
4. Do one of the following:
• If you are modeling a motor, choose Post Process/Motor Performance from the
Executive Commands menu to access the Motor Performance window.
• If you are not modeling a motor, choose Post Process/Export Circuit Equivalent. The Equivalent Circuit window appears. Set the appropriate parameters, then
choose Create Equivalent to create the circuit equivalent file.
5. Once you have exported the equivalent circuit, access Schematic Capture from the
Project Manager.
6. Use the File/Import Parts command to make the equivalent circuit available to Schematic Capture, or use the Add/Mechanical submenu to add an EMSS mechanical circuit equivalent.
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Maxwell Online Help System
6
Copyright © 1988-2001 Ansoft Corporation
EMSS – Equivalent Circuits
Topics:
EMSS Equivalent Circuits
General Procedure
Maxwell Equivalent Circuit
Window
Model
Format
Use Model Picture
Notes
Table File
Type
Units
Position
Depth
Interpolate
Field Type
Conductor Data
Extra Ports
Extrapolate
Nominal Matrix
Maxwell Equivalent Circuit Window
> To export a Maxwell Spice or Saber equivalent circuit:
• Choose Post Process/Export Circuit Equivalent from the Executive Commands
menu. A window similar to the following one appears: :
More
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Contents
Index
Maxwell Online Help System
7
Copyright © 1988-2001 Ansoft Corporation
Topics:
EMSS Equivalent Circuits
General Procedure
Maxwell Equivalent Circuit
Window
Model
Format
Use Model Picture
Notes
Table File
Type
Units
Position
Depth
Interpolate
Field Type
Conductor Data
Extra Ports
Extrapolate
Nominal Matrix
EMSS – Equivalent Circuits
Model
The Model menu allows you to choose the type of Maxwell 2D model you want to export.
•
•
Parameterized Model exports data from a parametric sweep.
Nominal Matrix exports data from the single current solved in the nominal solution.
When you choose this option, the window changes to allow you to select which of the
solved matrices you want to export. When exporing a nominal matrix, you may enter a
value at which to scale exported data, as well as define any Coupling limits.
Format
The format in which you want your model.
•
•
Maxwell SPICE, the Ansoft version of Berkeley SPICE.
Saber, a product of Analogy Inc., which writes its models in MAST. If you choose the
Saber model format, you can specify the DSYM Pin Spacing. This adjusts spacing
between pins for a DesignStar symbol, in mulitples of 16 grid units. Note that Extra
Ports works differently with a Saber model.
Use Model Picture
This checkbox determines whether the exported circuit equivalent displays a drawing of
the model. If you do not use a model picture, DesignStar symbols may be drawn faster in
circuit displays.
Notes
Enter text in the Notes field to describe the project. The notes are copied into the equivalent circuit file as comments.
Table File
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The name of the imported Maxwell 2D model. Use Read Table to access a .ptb file to
read in field simulator data table and inductance (or capacitance) matrices.
Contents
Index
Maxwell Online Help System
8
Copyright © 1988-2001 Ansoft Corporation
Topics:
EMSS Equivalent Circuits
General Procedure
Maxwell Equivalent Circuit
Window
Model
Format
Use Model Picture
Notes
Table File
Type
Units
Position
Depth
Interpolate
Field Type
Conductor Data
Extra Ports
Extrapolate
Nominal Matrix
EMSS – Equivalent Circuits
Type
This pull-down menu determines the model type for the exported data. Currently, you can
generate the following model types:
•
•
•
•
•
Matrix
Transformer
Linear Motion
Rotational Motion
Lookup Table
All are based on data tables and inductance files from magnetostatic solutions created in
Maxwell 2D.
The fields available in the Equivalent Circuit window under the Type and above the Extra
Ports areas change according to the model type. The Units and Depth specifications are
available for all models.
Matrix
Models an inductance or capacitance matrix for one or more conductors, as a function of
current or voltage. The parametric solution should cover the range of each conductor’s
current or voltage.
Transformer
Models nonlinear mutual inductance with a leakage inductance branch for each coil. The
parametric solution should cover the range of current for one coil in an open-circuit test.
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Contents
Index
Maxwell Online Help System
9
Copyright © 1988-2001 Ansoft Corporation
Topics:
EMSS Equivalent Circuits
General Procedure
Maxwell Equivalent Circuit
Window
Model
Format
Use Model Picture
Notes
Table File
Type
Units
Position
Depth
Interpolate
Field Type
Conductor Data
Extra Ports
Extrapolate
Nominal Matrix
EMSS – Equivalent Circuits
Linear Motion
Models inductance (or capacitance) and force as functions of current (or voltage) and
position. The parametric solution should cover the range of motion and conductor current
(or voltage). If you select Linear Motion, the following fields appear:
rz model
xy model
Motion.
•
•
Go Back
For xy models, enter the angle, in degrees, of the actuator’s direction of motion with
respect to the x-axis.
For rz models, choose positive or negative for direction.
Position. Select the position constraint variable from the pull-down variable list. In the rz
model above, stroke is a position constraint variable.
Contents
Index
Maxwell Online Help System
10
Copyright © 1988-2001 Ansoft Corporation
Topics:
EMSS Equivalent Circuits
General Procedure
Maxwell Equivalent Circuit
Window
Model
Format
Use Model Picture
Notes
Table File
Type
Units
Position
Depth
Interpolate
Field Type
Conductor Data
Extra Ports
Extrapolate
Nominal Matrix
EMSS – Equivalent Circuits
Rotational Motion
Model inductance and torque as functions of current (or voltage) and angle. Parametric
solutions should cover the range of motion and conductor current (or voltage). If you
select Rotational Motion, the following fields appear:
Motion.
The rotational direction parameters are the same, regardless of the geometric model
coordinate system. Choose the clockwise or counter-clockwise as the rotational direction from the pull-down list.
Lookup Table
When you select this option from the Type list, the Extrapolate menu appears, allowing
you to extrapolate and analyze the waveforms outside the range of the parametric sweep.
The Lookup Table option requires that no coils or inductance matrices have been specified.
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Contents
Index
Maxwell Online Help System
11
Copyright © 1988-2001 Ansoft Corporation
Topics:
EMSS Equivalent Circuits
General Procedure
Maxwell Equivalent Circuit
Window
Model
Format
Use Model Picture
Notes
Table File
Type
Units
Position
Depth
Interpolate
Field Type
Conductor Data
Extra Ports
Extrapolate
Nominal Matrix
EMSS – Equivalent Circuits
Units
The units to be used in the exported circuit equivalent. These do not have to be the same
as those used in building the model, but this is recommended.
Position
This field lists the conductors in the model. Select the one to use in the export from the
list.
Depth
> To set up the depth data (xy models only):
1. Select Depth by clicking the left mouse button.
2. Enter the height of the model, in the units used in the field simulator model, in the
Depth field.
Note:
If you are using an axisymmetric (rz) model, you do not need to select
Depth, since there is no height dimension.
Interpolate
If Lookup Table has been selected, use the Interpolation options to specify how EMSS
should treat the points within the range of the parametric sweep.
Linear
Select Linear to fit a straight line between the points of the interpolation.
Bezier on Last
If linear or rotational motion types have been chosen, select Bezier on Last to interpolate
the data points for the mechanical variable.
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Bezier on All
Select Bezier on All to interpolate the data points for electrical and mechanical variables.
Contents
Index
Maxwell Online Help System
12
Copyright © 1988-2001 Ansoft Corporation
Topics:
EMSS Equivalent Circuits
General Procedure
Maxwell Equivalent Circuit
Window
Model
Format
Use Model Picture
Notes
Table File
Type
Units
Position
Depth
Interpolate
Field Type
Conductor Data
Extra Ports
Extrapolate
Nominal Matrix
EMSS – Equivalent Circuits
Field Type
Determines the field coupling type used in the exported circuit equivalent.
•
•
Choose Electric to base the model on electric field coupling. The software uses
capacitance matrices and voltage inputs when it creates the equivalent circuit.
Choose Magnetic to base the model on magnetic field coupling. The software uses
inductance matrices and current inputs when it creates the equivalent circuit.
Conductor Data
The window below the Depth field displays information about the conductors in your Maxwell 2D model. You can change the Turns, Resistance, and Current associated with a
conductor (you cannot change its name).
Conductor Name of the conductor in the geometric model.
Number of turns in the model coil. This applies only to magnetic field
Turns
coupling.
Resistance Resistance, in ohms, of the selected conductor.
The variable used for current in the geometric model, given in
Current
ampere-turns, for the selected conductor
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Maxwell Online Help System
> To set up inductances for a conductor:
1. Select the conductor from the conductor data window.
2. Enter the number of turns in the Turns field.
3. Enter the resistance of the conductor in the Resistance field. This can be zero.
4. Select a current variable from the Current menu.
5. Choose Accept. The number of turns and the current variable are associated with the
specified conductor.
13
Copyright © 1988-2001 Ansoft Corporation
Topics:
EMSS Equivalent Circuits
General Procedure
Maxwell Equivalent Circuit
Window
Model
Format
Use Model Picture
Notes
Table File
Type
Units
Position
Depth
Interpolate
Field Type
Conductor Data
Extra Ports
Extrapolate
Nominal Matrix
EMSS – Equivalent Circuits
Extra Ports
You may set up extra ports to include additional input and output variables in your equivalent model. If you select Extra Ports, an area for entering extra ports parameters
appears. This area will vary depending on whether you are exporting a Maxwell SPICE or
a Saber circuit equivalent.
> To set up an extra port:
1. Enable extra ports by selecting Extra Ports. A pop-up window appears with a list of
variables. If you have chosen Saber format, an additional set of port information
appears to the right.
2. Select the variable you want to associate with the port from the list, changing the Use
indicator from no to yes.
3. Repeat the previous step until you have selected all the extra ports that you need.
Note:
You cannot select an extra input that has already been used as a conductor or position input.
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Contents
Index
Maxwell Online Help System
14
Copyright © 1988-2001 Ansoft Corporation
Topics:
EMSS Equivalent Circuits
General Procedure
Maxwell Equivalent Circuit
Window
Model
Format
Use Model Picture
Notes
Table File
Type
Units
Position
Depth
Interpolate
Field Type
Conductor Data
Extra Ports
Extrapolate
Nominal Matrix
EMSS – Equivalent Circuits
Use.
Determines whether on not the port is added to the model.
Name.
Name of the variable associated with the port
In/Out.
For models in Saber model format, you can choose one of the following types from
the pull-down menu:
pins
Generates a pair of Saber pins for either input or output. The extra variable will be either through or across, depending on the Saber units
selected. Refer to your Saber documentation for more information.
property For extra inputs, the variable can be a calling argument for the Saber
templates, rather than a pair of pins.
val
For extra outputs, the variable can be a signal available for plotting,
rather than a pair of pins to drive other elements.
Units.
For models in Maxwell SPICE format, this option is not available. All extra ports are single
pins for voltage input or output, with an internal ground.
For models in Saber model format, you can assign units to the extra ports from the dropdown menu. Only units appropriate to Maxwell generated models are included
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Contents
Index
Maxwell Online Help System
15
Copyright © 1988-2001 Ansoft Corporation
Topics:
EMSS Equivalent Circuits
General Procedure
Maxwell Equivalent Circuit
Window
Model
Format
Use Model Picture
Notes
Table File
Type
Units
Position
Depth
Interpolate
Field Type
Conductor Data
Extra Ports
Extrapolate
Nominal Matrix
EMSS – Equivalent Circuits
Extrapolate
Select an extrapolation option in order to analyze the waveform outside the range of the
parametric sweep. The default extrapolation is linear.
Linear
Select Linear to extrapolate a linear waveform. This option takes the last two points of the
wave and generates a straight line extending beyond the range of the parametric sweep
from those points.
Periodic
Select Periodic to repeat the wave outside the range of the parametric sweep.
Halfperiod
Select Halfperiod to mirror then repeat the waveform outside the range of the parametric
sweep.
Constant
Select Constant to extrapolate a constant value from the last point in the interpolation.
Even
Select Even to repeat the waveform outside the range of the parametric sweep.
Odd
Select Odd to repeat a reflection of the waveform outside the range of the parametric
sweep. For example, if the waveform exists in the negative range during the parametric
sweep, extrapolating with this option reflects the wave into the positive range.
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Contents
Index
Maxwell Online Help System
16
Copyright © 1988-2001 Ansoft Corporation
Topics:
EMSS Equivalent Circuits
General Procedure
Maxwell Equivalent Circuit
Window
Nominal Matrix
Scale By
Specifying the Matrix
Files
Coupling Limits
EMSS – Equivalent Circuits
Nominal Matrix
When you select Nominal Matrix from the Model pull-down menu, the following window
appears, allowing you to define the capacitance, inductance, resistance, conductance,
and scaling factor for the model:
Scale By
Enter the value at which to scale the data in this field.
Specifying the Matrix Files
You may select the specific matrix files to include in the exported circuit model.
> To define the matrix files:
1. Select the matrix to include in the exported model. Once selected, a file folder icon
appears to the right of the matric file path.
2. Choose the file folder icon. A file browser appears.
3. Use the browser to select the file to use in the export.
4. Repeat steps 2 and 3 for each matrix to include.
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Contents
Index
Maxwell Online Help System
17
Copyright © 1988-2001 Ansoft Corporation
Topics:
EMSS Equivalent Circuits
General Procedure
Maxwell Equivalent Circuit
Window
Nominal Matrix
Scale By
Specifying the Matrix Files
Coupling Limits
EMSS – Equivalent Circuits
Coupling Limits
Choose Coupling Limits to define the lower limits on the mutual coupling elements for a
model. Note that any of the capacitance, inductance, resistance, and conductance values
less than the specified amounts will not be included in the exported model.
> To define the coupling limits:
1. Choose Coupling Limits. The Coupling Limits window appears.
2. Select Value or Fraction of self x for each of the values for which to define a lower
coupling limit.
3. Choose OK. You return to the EMSS window.
Go Back
The coupling limits are now defined.
Contents
Index
Maxwell Online Help System
18
Copyright © 1988-2001 Ansoft Corporation
Topics:
EMSS Equivalent Circuits
General Procedure
Equivalent Circuit Window
Modeling Motors in EMSS
EMSS Motor Setup
Motor Performance Window
EMSS – Modeling Motors in EMSS
Modeling Motors in EMSS
To model motors or generators in EMSS, you must set up your model from Maxwell 2D,
then export the model to Schematic Capture. Use the EMSS Motor Setup window to enter
the parameters for your model.
> To access the EMSS Motor Setup window:
1. Choose Setup Solution/Variable Control from the Executive Commands menu. The
following window appears:
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Contents
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Maxwell Online Help System
2. Select Configure. The Motor Setup window appears, allowing you to enter your
motor parameters.
3. Choose the machine type you want to model. The motor parameters, and their default
values, change according to which of four motors you want to model:
• Induction Motor (3-ph)
• PM Synch Motor (3-ph)
• Reluctance Motor (3-ph)
• Synchronous Generator
4. Select any parameters you want to change, and enter the new parameters. A description of any selected parameter appears in the Description box below the parameter
list. The induction motor allows you to change certain parameters from the Motor Performance window after you’ve solved the field simulation.
Note:
To export a dq0 model, choose Do Transient Parameters from the motor
setup window.
5. Select Wye or Delta as your three-phase source.
19
Copyright © 1988-2001 Ansoft Corporation
Topics:
EMSS Equivalent Circuits
General Procedure
Equivalent Circuit Window
Modeling Motors in EMSS
EMSS Motor Setup
Induction Motor
PM Synchronous Motor
Reluctance Motor
Synchronous Generator
Motor Performance Window
EMSS – Modeling Motors in EMSS
EMSS Motor Setup
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Contents
Index
Maxwell Online Help System
20
Copyright © 1988-2001 Ansoft Corporation
Topics:
EMSS Equivalent Circuits
General Procedure
Equivalent Circuit Window
Modeling Motors in EMSS
EMSS Motor Setup
Induction Motor
PM Synchronous Motor
Reluctance Motor
Synchronous Generator
Motor Performance Window
EMSS – Modeling Motors in EMSS
Induction Motor Parameters
Parameter
Voltage Line [V]
Frequency [Hz]
I1 Line [A]
Period
Pole Pairs
Turns
Density Per Amp
[A/m2]
Length [m]
Stator Slots
RotorSlots
StackFactor
PitchFactor
R1 [Ohms]
MechLoss [W]
StrayLoss [W]
CoreLoss [W]
Description
Rated line-to-line applied voltage.
Rated source frequency.
Estimated rated line current.
Ratio of entire motor area to the solved field
area.
Number of pole pairs.
Number of turns in series per phase.
Equivalent stator slot current density for unit
input phase current.
Axial length of the core.
The number of stator slots in the entire model.
The number of rotor slots in the entire model.
Stack factor of stator lamination.
Fractional pitch factor of stator winding.
Stator resistance per phase, at the rated running temperature. Can be changed from the
Motor Performance window.
Mechanical loss at rated running conditions.
Can be changed from the Motor Performance
window.
Stray loss at rated running conditions.
Core loss at rated running conditions. Can be
changed from the Motor Performance window.
Default
208
60
65.7
4
2
44
46548
0.139
48
40
.93
.833
0.0583
225
185
358
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Contents
Index
Maxwell Online Help System
21
Copyright © 1988-2001 Ansoft Corporation
Topics:
EMSS Equivalent Circuits
General Procedure
Equivalent Circuit Window
Modeling Motors in EMSS
EMSS Motor Setup
Induction Motor
PM Synchronous Motor
Reluctance Motor
Synchronous Generator
Motor Performance Window
EMSS – Modeling Motors in EMSS
Parameter
L1End [H]
L1Har [H]
L2End [H]
L2Har [H]
R2End [Ohms]
SkewFactor
Description
Stator end leakage inductance per phase.
Can be changed from the Motor Performance
window.
Stator harmonic leakage inductance per
phase. Can be changed from the Motor Performance window.
Rotor end leakage inductance per phase. Can
be changed from the Motor Performance window.
Rotor harmonic leakage inductance per
phase. Can be changed from the Motor Performance window.
Rotor end resistance per phase. Can be
changed from the Motor Performance window.
Skew factor in rotor slot units. Can be
changed from the Motor Performance window.
Default
8.223E–005
.19685
.1509
.0005
0.0079444
.5
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Contents
Index
Maxwell Online Help System
22
Copyright © 1988-2001 Ansoft Corporation
Topics:
EMSS Equivalent Circuits
General Procedure
Equivalent Circuit Window
Modeling Motors in EMSS
EMSS Motor Setup
Induction Motor
PM Synchronous Motor
Reluctance Motor
Synchronous Generator
Motor Performance Window
EMSS – Modeling Motors in EMSS
Permanent Magnet Synchronous Motor Parameters
Parameter
Voltage Line [V]
Frequency [Hz]
Stator Slot
I1 Line [A]
HarmonicNo
Pole Pairs
Turns
Density Per Amp [A/m2]
Length [m]
MechLoss [W]
Stray loss
Core Loss [W]
XOrigin [m]
YOrigin [m]
Chording
R1 [Ohms]
L1 [H]
Go Back
Description
Rated line-to-line applied voltage.
Rated source frequency.
Total number of stator slots.
Rated line current.
Highest order of harmonic component
for which to account.
Number of pole pairs.
Number of turns in series per phase.
Equivalent stator slot current density
for unit input phase current.
Axial length of the core.
Mechanical loss at rated running condition.
Stray loss at rated running condition,
percent of rated output.
Core loss at rated running condition.
X-coordinate of motor center in the
drawing plane.
Y-coordinate of motor center in the
drawing plane.
Fractional pitch factor of stator winding.
Stator resistance per phase at running
conditions.
Stator winding end leakage inductance
per phase.
Default
208
60
36
3
20
2
246
634544
0.0788
16.3
0.01
18
-0.03
-0.02
0.889
1.87
0.00907
Contents
Index
Maxwell Online Help System
23
Copyright © 1988-2001 Ansoft Corporation
Topics:
EMSS Equivalent Circuits
General Procedure
Equivalent Circuit Window
Modeling Motors in EMSS
EMSS Motor Setup
Induction Motor
PM Synchronous Motor
Reluctance Motor
Synchronous Generator
Motor Performance Window
EMSS – Modeling Motors in EMSS
Reluctance Motor Parameters
Parameter
Voltage Line [V]
Frequency [Hz]
Stator Slot
I1 Line [A]
HarmonicNo
Pole Pairs
Turns
Density Per Amp [A/m2]
Length [m]
MechLoss [W]
Stray loss
Core Loss [W]
XOrigin [m]
YOrigin [m]
GapRadius[m]
Chording
R1 [Ohms]
Go Back
L1 [H]
Description
Rated line-to-line applied voltage.
Rated source frequency.
Total number of stator slots.
Rated line current.
Highest order of harmonic component
for which to account.
Number of pole pairs.
Number of turns in series per phase.
Equivalent stator slot current density
for unit input phase current.
Axial length of the core.
Mechanical loss at rated running condition.
Stray loss at rated running conditions,
percent of rated output.
Core loss at rated running conditions.
X-coordinate of motor center in the
drawing plane.
Y-coordinate of motor center in the
drawing plane.
Radius for air gap flux profile.
Fractional pitch factor of stator winding.
Stator resistance per phase at running
conditions.
Stator winding end leakage inductance
per phase.
Default
208
60
36
7.16283
20
2
246
634544
0.0788
16.3
0.01
18
-0.03
-0.02
0.046355
0.889
1.87
0.00907
Contents
Index
Maxwell Online Help System
24
Copyright © 1988-2001 Ansoft Corporation
EMSS – Modeling Motors in EMSS
Topics:
EMSS Equivalent Circuits
General Procedure
Equivalent Circuit Window
Modeling Motors in EMSS
EMSS Motor Setup
Induction Motor
PM Synchronous Motor
Reluctance Motor
Synchronous Generator
Motor Performance Window
Synchronous Generator Parameters
Parameter
Voltage Line [V]
Frequency [Hz]
Stator Slot
I1 Line [A]
HarmonicNo
If [A]
PowerAngle [deg]
PowerFactor
Pole Pairs
Turns
Density Per Amp [A/m2]
IfDensity Per Amp [A/m2]
Length [m]
XOrigin [m]
YOrigin [m]
More
Go Back
GapRadius[m]
Chording
R1 [Ohms]
L1 [H]
Contents
Description
Rated line-to-line applied voltage.
Rated source frequency.
Total number of stator slots.
Rated line current.
Highest order of harmonic component
for which to account.
Initial guess of rated excitation current.
Initial guess of power angle at rated load.
Prescribed power factor at rated load.
Number of pole pairs.
Number of turns in series per phase.
Equivalent stator slot current density
for unit input phase current.
Field current density for unit excitation
current.
Axial length of the core.
X-coordinate of motor center in the
drawing plane.
Y-coordinate of motor center in the
drawing plane.
Radius for air gap flux profile.
Fractional pitch factor of stator winding.
Stator resistance per phase at running
conditions.
Stator winding end leakage inductance
per phase.
Default
15750
50
54
8625
50
1260
30
0.85
1
9
265.8
2402
4.5
0
0.046355
0.590339
0.915
0.012
0.000353
Index
Maxwell Online Help System
25
Copyright © 1988-2001 Ansoft Corporation
Topics:
EMSS Equivalent Circuits
General Procedure
Equivalent Circuit Window
Modeling Motors in EMSS
EMSS Motor Setup
Motor Performance Window
Axis Format
Plot Format
Export dq0 Circuit
Change Motor Parameters
EMSS – Modeling Motors in EMSS
Motor Performance Window
Maxwell 2D automatically provides plotting data for motors and generators. You can
access these plots after solving for the motor values, which are stored in plot data (.dat)
files, so you can also open them using the Plot menu in Post Process/Variables. Which
plots are provided automatically depends on which motor or generator you are modeling.
> To access the EMSS Motor Performance window:
• Select Post Process/Motor Performance from the Executive Commands menu. A
window similar to the following one appears:
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Topics:
EMSS Equivalent Circuits
General Procedure
Equivalent Circuit Window
Modeling Motors in EMSS
EMSS Motor Setup
Motor Performance Window
Axis Format
Plot Format
Export dq0 Circuit
Change Motor Parameters
EMSS – Modeling Motors in EMSS
The buttons in the Motor Performance window are:
Export
Edit
Zoom In
Zoom Out
Fit All
Coordinates
Axis Format
Plot Format
Recalc
Done
Exports a dq0 motor equivalent.
Allows you to change a small number of motor parameters. This
option is currently only available for induction motors.
Scales the plot to fit a defined region over the entire display area.
Scales the entire plot to fit in a defined region.
Fits the entire plot in the display area.
Displays a coordinates pop-up window, which shows the x- and
y-coordinates of a mouse click on the plot. End this mode by
clicking the right mouse button.
Determines plot axis appearance.
Determines plot line appearance.
Recalculates the plot after you change parameters using Edit.
Exits the Motor Performance window.
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Topics:
EMSS Equivalent Circuits
General Procedure
Equivalent Circuit Window
Modeling Motors in EMSS
EMSS Motor Setup
Motor Performance Window
Axis Format
Plot Format
Export dq0 Circuit
Change Motor Parameters
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Contents
Index
Maxwell Online Help System
EMSS – Modeling Motors in EMSS
Axis Format
> To define axis properties:
1. Select the Axis Format button. The following window appears, allowing you to
change:
•
•
•
•
the labeling by editing the Heading, X Label, and Y Label fields.
the range of your axes by editing the Xmin, Xmax, Ymin, and Ymax fields.
whether grids and ticks are displayed, and at what frequency.
whether legends and axes are displayed or not.
2. Choose OK when you are finished formatting the plot axes.
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Copyright © 1988-2001 Ansoft Corporation
Topics:
EMSS Equivalent Circuits
General Procedure
Equivalent Circuit Window
Modeling Motors in EMSS
EMSS Motor Setup
Motor Performance Window
Axis Format
Plot Format
Export dq0 Circuit
Change Motor Parameters
EMSS – Modeling Motors in EMSS
Plot Format
> To define plot properties:
1. Select the Plot Format button. The following pop-up window appears.
2. Choose the plot you want to format from the list. For that plot, you can now change:
•
•
•
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the plot line Color, Width, and Style.
Marker style.
whether markers, lines, or both are displayed.
3. Choose OK when you are finished formatting the plot display.
Contents
Index
Maxwell Online Help System
29
Copyright © 1988-2001 Ansoft Corporation
Topics:
EMSS Equivalent Circuits
General Procedure
Equivalent Circuit Window
Modeling Motors in EMSS
EMSS Motor Setup
Motor Performance Window
Axis Format
Plot Format
Export dq0 Circuit
Change Motor Parameters
EMSS – Modeling Motors in EMSS
Export dq0 Circuit
When you create a dq0 circuit model in Maxwell 2D, you can export an equivalent circuit,
just as with other models. However, you must use the Export button in the Motor Performance window, rather than the Maxwell Equivalent Circuit window, to do this.
> To export a dq0 circuit model:
1. choose Do Transient Parameters from the motor setup window. When you solve for
variables, the transient parameters will be included in the parametric table.
2. Select Export from the Motor Performance window. The following window appears:
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The dq0 Circuit Model Export window uses the defaults from motor you selected in the
Motor Setup window. Fill in the fields as needed and select Export. The exported circuit
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Maxwell Online Help System
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Copyright © 1988-2001 Ansoft Corporation
Topics:
EMSS Equivalent Circuits
General Procedure
Equivalent Circuit Window
Modeling Motors in EMSS
EMSS Motor Setup
Motor Performance Window
Axis Format
Plot Format
Export dq0 Circuit
Change Motor Parameters
EMSS – Modeling Motors in EMSS
equivalent is stored in the partsdb directory.
Rs [ohms]
LLD [H]
Use LLQ
Use LL0
Use D1
Use D2
Use Q1
Use Q2
•
•
Stator resistance. You don’t need to change this parameter,
which is determined from the motor setup.
Leakage inductance for the d-axis.
• This is the default leakage inductance, and is used
unless Use LLQ or Use LL0 are selected.
• You don’t need to change this parameter, which is determined from the motor setup.
Use a separate leakage inductance for the q-axis.
Use a separate zero-sequence leakage inductance.
Use a damper circuit on the rotor d-axis.
• For induction motors, this option is already used, so it is
disabled.
• For synchronous generators, this option must be used for
the field winding, so it is selected by default.
Use a damper circuit on the stator d-axis.
Use a damper circuit on the rotor q-axis. For induction
motors, this option is already used, so it is disabled.
Use a damper circuit on the stator q-axis.
The input pins represent motor speed, rather than position as in other equivalent circuits.
The output pins represent torque (+ and –), rather than linear force.
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Index
Maxwell Online Help System
31
Copyright © 1988-2001 Ansoft Corporation
Topics:
EMSS Equivalent Circuits
General Procedure
Equivalent Circuit Window
Modeling Motors in EMSS
EMSS Motor Setup
Motor Performance Window
Axis Format
Plot Format
Export dq0 Circuit
Change Motor Parameters
EMSS – Modeling Motors in EMSS
Change Motor Parameters
Because EMSS problems are solved in two dimensions, you can change some of the
induction motor parameters in the Post Processor.
> To edit motor performance parameters:
1. Choose Edit from the Motor Performance window. The following window appears:
2. Select the value you want to change from the list, and edit the field.
3. Choose OK when you are finished making your changes.
Note:
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If you want to change motor parameters for an induction motor solved with
an earlier version of EMSS, you need to re-solve the problem.
> To re-solve for a later version:
1. Open Maxwell 2D and choose Draw. Save the model, then exit.
2. Choose Setup Solution/Options, then Manual Mesh, and create a
mesh in the same way as you originally set up the motor.
3. Exit the Meshmaker, then set up the other options as originally done.
4. Solve the nominal problem, and set up the motor configuration as
before.
5. Solve the parametric problem. The Motor Performance window will
now allow you to edit certain induction motor parameters.
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Maxwell EMSS — Index
Thumbtabs:
A
D
B
E
C
F
A
actuator motion setup
C
G
H
I
J
K
L
M
N
O
E
Conductor Data
conductor position
conductors
coupling limits
P
Q
R
electric fields
Extra Ports
extrapolation of data
S
T
U
F
V
W
X
Y
Z
#
fields
Format
I
interpolation
L
linear motion
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Contents
Index
Maxwell Online Help System
model format
model units
N
Nominal Matrix
P
Position
R
rotational actuator
rotational motion
S
Scale By
setup rotational actuator
T
Table File
Type
U
Units
M
magnetic fields
matrix files
Maxwell Equivalent Circuit window
actuator motion
rotational actuator
Model
model depth
Copyright © 1988-2001 Ansoft Corporation