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© CADFEM 2017
Numerical Vibration Analysis of Electric Drives
Martin Hanke, Marold Moosrainer, Jürgen Wibbeler
CADFEM ANSYS Simulation Conference 2017, Winterthur 1
© CADFEM 2017
ANSYS EM Vibration Workflow
CADFEM ANSYS Simulation Conference 2017, Winterthur 2
© CADFEM 2017
ANSYS EM Vibration Workflow
CADFEM ANSYS Simulation Conference 2017, Winterthur 3
© CADFEM 2017
CADFEM Workflow: Rotational Speed Interpolation
CADFEM ANSYS Simulation Conference 2017, Winterthur 4
© CADFEM 2017 CADFEM ANSYS Simulation Conference 2017, Winterthur
• To calculate ERP modal
coefficients cm from mcf file
and the matrix Umm‘ are
needed
• No expansion pass in
harmonic required
• dB = 10*log10(P/1e-12)
nmm
m
mm
m
nmnm
m
mm
m
nmnm
m
mm
m
n
m
nmmn
n
UcccP
dAuucccP
uuccv
ucv
dAvcP
','
'
2
',,'
'
2
',,'
'
22
,
2
2/
2/
2/ :power spectral Acoustic
ERP from MCF
Equivalent Radiated Power from Modal Coefficient File
© CADFEM 2017
Magnetic Force Calculation from Maxwell‘s Stress Tensor
CADFEM ANSYS Simulation Conference 2017, Winterthur 6
© CADFEM 2017
Forces in Time and Frequency Domain
CADFEM ANSYS Simulation Conference 2017, Winterthur 7
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Remote Force Application
CADFEM ANSYS Simulation Conference 2017, Winterthur 8
© CADFEM 2017
Material Homogenization
CADFEM ANSYS Simulation Conference 2017, Winterthur 9
VFcFcV
u
uFWcVVW ext
/
:1 With
2
int
)2(
6
)2(
5
)2(
4
)2(
3
)2(
2
)2(
1
666564636261
565554535251
464544434241
363534333231
262524232221
161514131211
0
0
0
0
1
0
F
F
F
F
F
F
KKKKKK
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KKKKKK
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KKKKKK
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FuK
© CADFEM 2017
ACT Implementation
CADFEM ANSYS Simulation Conference 2017, Winterthur 10
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Vibration Simulation using ANSYS Mechanical
CADFEM ANSYS Simulation Conference 2017, Winterthur 11
Spectrum of Equivalent Radiated Power (ERP) at a Single Speed:
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ERP Waterfall
CADFEM ANSYS Simulation Conference 2017, Winterthur 12
Mode 1 Mode 3 Mode 6
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Summary
CADFEM ANSYS Simulation Conference 2017, Winterthur 13
Electro-
magnetic
Analysis
Harmonic
Vibration
Analysis DFT
Oscillation,
ERP,
Waterfall Plot Excitation
Loads
External computation of
excitation loads
