maxwell & simplorer tips and tricks -...

© 2010 ANSYS, Inc. All rights reserved. 1 ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved. 1 ANSYS, Inc. Proprietary

Maxwell & Simplorer

Tips and Tricks

Ryan Magargle

Dennis Steward

Ansys, Inc.

© 2010 ANSYS, Inc. All rights reserved. 2 ANSYS, Inc. Proprietary

Outline

• Maxwell

– Geometry

– Transient

– Post-Processing

• Simplorer

– Transient Solver

– Post-Processing

– Advanced Analysis


Maxwell Geometry Interface

• Topic

– Remove geometry commands in any order to

reduce the need for redrawing geometry



• Example

– Create motor coils for symmetry, then change

mind and undo symmetry



• Topic

– Increase geometry visibility with split planes



• Steps

– Click Draw Clip Plane

– Click Add-> Specify

Center, Normal

1

2

1

2



• Steps

– Grab and drag to change clip plane view


Outline

• Maxwell

– Geometry

– Transient

– Post-Processing

• Simplorer


– Post-Processing



Maxwell Transient Solver

• Topic

– Multiple objects with independent motion

Actuated magnet has

motion prescribed by

user

Victim magnet moves with

its own inertia to align with

actuated magnet



• Setup

– Draw a “band” around each

object with independent

motion

– Assign axis of rotation and

type of motionAir region

band1 band2

magnet1 magnet2

Axis of

rotation

1

Axis of

rotation

2

1

2

1

2



• Setup

– Apply mesh operations

– Specify time step and stop time

3

4

3

4



• Setup

– Plot flux lines

– Plot motion and animate

3

4

0.00 50.00 100.00 150.00 200.00Time [ms]

-100.00

0.00

100.00

200.00

300.00

Po

sit

ion

[d

eg

]

Maxwell2DDesign1Magnet Motion ANSOFT

Curve Info

Victim MagnetSetup1 : Transient

Source MagnetSetup1 : Transient

3

4



• Topic

– Define complex transient excitation with

functions and datasets

0.00 2.50 5.00 7.50 10.00 12.50 15.00 17.50 20.00Time [ms]

-1.25

-0.63

0.00

0.63

1.25

Inp

utC

urr

en

t(W

ind

ing

1)

[A]

Maxwell2DDesign1Input Current Waveform ANSOFT

Curve Info

InputCurrent(Winding1)Setup1 : Transient

1A Sinusoid + .15A Triangle



• Steps

– Define coil cross section

as a ‘coil’ with turns.

– Define winding with

current function:

• 1A*Sin(2*Pi*50*time)+

0.15A*pwl_periodic(ds1,time)

1

2

Periodic piecewise linear

interpolation function of

numeric dataset, defined by

user

1

2



• Steps

– pwl_periodic(ds1,time) causes Maxwell

to prompt for dataset definition

Unit Amplitude

Triangle Wave



• Resulting Current Waveforms

0.00 5.00 10.00 15.00 20.00Time [ms]

-100.00

-50.00

0.00

50.00

100.00

Ind

uc

ed

Vo

lta

ge

(Win

din

g1

) [V

]

Coil Back EMF ANSOFT

Curve Info

InducedVoltage(Winding1)Setup1 : Transient

0.00 5.00 10.00 15.00 20.00Time [ms]

-1.25

-0.63

0.00

0.63

1.25

Inp

utC

urr

en

t(W

ind

ing

1)

[A]

Input Current Waveform ANSOFT

Curve Info

InputCurrent(Winding1)Setup1 : Transient

1A*Sin(2*Pi*50*time)+

0.15A*pwl_periodic(ds1,time)



• Topic

– Define variable timestep to capture complex

waveform shape.

Broadband excitation for sensing

applications



• Steps

– Define coil cross section

as a ‘coil’ with turns.

– Define winding with

current function:• 1A*Sin(2*Pi*(1250*time+50)*time)

Frequency increases linearly

from 50Hz to 150Hz in 8

fundamental periods

1

2

1

2



• Steps

– Capture 30 steps per period, for 8 fund. periods

• 1/30/(1250*time+50)

3

3


Outline

• Maxwell

– Geometry

– Transient

– Post-Processing

• Simplorer


– Post-Processing



Maxwell Post-Processing

• Topic

– Use fields calculator to plot only

Br in airgap for electric machine

Flux Density Contour

Flux Density Vector Radial Flux Density Vector



• Calculator

– Scalar Field:

– Vector Field:

• Steps

– Define Br

– Save Br as a new Field Expression

– Define Br_vec using Br

– Save Br_vec as a new Field

Expression

yxyyxxrr iiiBiBiBB sincos

yxrrrr iiBiBB sincos



• Calculator: Define Br

– Input -> Quantity -> B

– Vector -> Scalar? -> ScalarX

– Input -> Function -> Phi

– Scalar -> Trig -> Cos

– General -> *

– Input -> Quantity -> B

– Vector -> Scalar? -> ScalarY

– Input -> Function -> Phi

– Scalar -> Trig -> Sin

– General -> *

– General -> +

– General -> Smooth

– Library -> Add… -> “Br”

Calculator: Define Br_Vector Named Expressions -> Br ->

Library-> Copy to Stack

Input-> Function->Phi

Scalar -> Trig -> Cos

General -> *

Scalar -> Vec? -> VecX

Named Expressions -> Br-> Library->Copy to Stack

Input -> Function->Phi

Scalar -> Trig -> Sin

General -> *

Scalar -> Vec? -> VecY

General -> +

Library -> Add… -> “Br_vec”



• Topic

– Graph the radial flux density in the gap

0.00 10.00 20.00 30.00 40.00 50.00 60.00Distance [mm]

-0.13

0.07

0.27

0.47

0.67

0.88

Br

[ T

]

Radial Flux Density in Air Gap Over One Pole ANSOFT



• Steps

– Draw-> Arc -> 3 point Arc

– Create Fields Report

– Select the arc and Br

1

2

3

0.00 10.00 20.00 30.00 40.00 50.00 60.00Distance [mm]

-0.13

0.07

0.27

0.47

0.67

0.88

Br

[ T

]

Radial Flux Density in Air Gap Over One Pole ANSOFT



• Take Spatial FFT

• Steps:– Right click Setup1 and select Perform

FFT on Report

– Select the flux density plot and select

magnitude for the spectral plot.

1

2

0.00 100.00 200.00 300.00 400.00 500.00FFT Distance Harmonic

0.00

0.10

0.20

0.30

0.40

0.50

FF

T B

r

FFT Radial Flux Density in Air Gap Over One Pole ANSOFT

1

2


-60.00 -40.00 -20.00 0.00 20.00 40.00H [A / m] [kA_per_m]

0.00

0.20

0.40

0.60

0.80

1.00

1.20

1.40

B [

T ]

BH Operating Point in Iron and Air ANSOFT

Curve Info

Imported BHImported

Operating Point IronSetup1 : LastAdaptive


• Topic

– Display magnet operating point on BH curve



• Steps– Export BH curve for Alnico5

– Add header to BH text file

– Solve design in iron or air fixture

1

2

3

1

2

3


-60000.00 -40000.00 -20000.00 0.00 20000.00 40000.00H [A / m]

0.00

0.20

0.40

0.60

0.80

1.00

1.20

1.40

B [

T ]

BH Operating Point in Iron and Air ANSOFT

Curve Info

Imported BHImported

Operating Point IronSetup1 : LastAdaptive

Operating Point AirImported


• Steps– Use calculator to define Hx and Bx

– Draw a point to evaluate fields

– Create fields report of Bx vs Hx at

defined point

– Import BH curve into report

– Paste results from other simulations

5

4

6

7

8

5

4

6

7

8


Outline

• Maxwell

– Geometry

– Transient

– Post-Processing

• Simplorer


– Post-Processing



Simplorer Transient Solver

• Topic: Change schematic netlist mid-simulation

– Pause Simulation, Modify Values and Continue


Simplorer Post Processing

• Topic: Create numerical display

– Add display to schematic for instant numeric

display of circuit gain

0

0

0

E1

AMPL=0.01V

FREQ=1000Hz

VccEMF=12V

RB1a50kOhm

RE15kOhm

RB2a100kOhm

RB2b22kOhm

RE21kOhm

SPICE_NPN1

SPICE_NPN2

CC1

1uF

CC2

1uF

+

V

VM1

TR

Probe

TR_Probe1

EQU

gain:=TR_Probe1.PKPK /(E1.AMPL *2)

RB1b50kOhm

RC2RC

CE210uF

Vb1

Ve1 Ve2

Vc2

Vb2

0.10 0.30 0.50 0.70 0.90Time [ns]

0.10

0.50

0.90

E1

.V [V

]

Curve Info pk2pk

E1.VTR

0.10 0.35 0.60 0.85Time [ns]

0.10

0.50

0.90

Vc2

.V

Curve Info pk2pk

Vc2.VTR



• Steps

– Create a data table

– Pare To: Time Max

1

2

1

2



• Steps

– Drag plot onto schematic 3


Outline

• Maxwell

– Geometry

– Transient

– Post-Processing

• Simplorer


– Post-Processing



Simplorer Advanced Analysis

• Topic: Statistical Analysis

– Vary component parameters to measure

manufacturing variation on performance

0

0

0

E1

AMPL=0.01V

FREQ=1000Hz

VccEMF=12V

RB1a50kOhm

RE15kOhm

RB2a100kOhm

RB2b22kOhm

RE21kOhm

SPICE_NPN1

SPICE_NPN2

CC1

1uF

CC2

1uF

+

V

VM1

TR

Probe

TR_Probe1

EQU

gain:=TR_Probe1.PKPK /(E1.AMPL *2)

RB1b50kOhm

RC2RC

CE210uF

Vb1

Ve1 Ve2

Vc2

Vb2

0.10 0.30 0.50 0.70 0.90Time [ns]

0.10

0.50

0.90

E1

.V [V

]

Curve Info pk2pk

E1.VTR

0.10 0.35 0.60 0.85Time [ns]

0.10

0.50

0.90

Vc2

.V

Curve Info pk2pk

Vc2.VTR



• Steps

– Select properties for

each resistor.

– Select distribution for

each resistor.

11

2

2



• Steps

– Add statistical analysis

– Define Monte Carlo

iterations

– Define measured output

3

4

5

3

5

4



• Steps

– Execute statistical analysis

– View analysis results

6

7

6

7



• Topic: Import complex load waveforms from

empirical data

– Reduce a complex sub-system to data from

measurements.



• Steps

– Import text file as a dataset

– Use datapairs block for

dataset interpolation

– Select the dataset in (1)

1

1

22

3

3



• Steps

– Plot interpolated source and output.



• Topic: Digitize datasheet information using

the sheetscan tool.

– An automated approach to digitizing measured

data for use in simulation.



• Steps

– In datasets window

select sheetscan source

– Picture -> Load Picture

1

21

2



• Steps

– Coordinate System -> New,

Click to locate coordinate axes

– Curve -> New, click to locate

datapoints

– File -> Export, to export text file

3

4

3

4

5

5


Thank You

• Questions?

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