manatee software presentation
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© 2013- EOMYS ENGINEERING / 121, rue de Chanzy 59260 Lille-Hellemmes FRANCE / contact@eomys.com
MANATEE® SIMULATION SOFTWARE
Magnetic Acoustic Noise Analysis Tool for Electrical Engineering
Presentation of MANATEE software (v1.06) developed and distributed by EOMYS (www.eomys.com)
© 2013- EOMYS ENGINEERING / 121, rue de Chanzy 59260 Lille-Hellemmes FRANCE / contact@eomys.com
I. PRESENTATION
MANATEE is a simulation software for the optimal electromagnetic design of electrical
machines including the analysis of magnetic vibrations and acoustic noise due to Maxwell
forces.
MANATEE is currently under Matlab® (R2009b or later), but its Graphical User Interface is in
Python/Qt to set-up the machine and simulation parameters.
MANATEE does not use any Matlab toolbox.
Based on the hybridation of analytical, semi-analytical and finite element methods for
electromagnetic and mechanical models, MANATEE represents the best compromise between
accuracy and calculation time, allowing to include the variable-speed noise and vibration
criteria during a fast virtual prototyping phase or a design optimization process.
2
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© 2013- EOMYS ENGINEERING / 121, rue de Chanzy 59260 Lille-Hellemmes FRANCE / contact@eomys.com
The following topologies are included in MANATEE v1.06:
• Inner rotor squirrel cage induction machine (including doubly-fed operation)
• Inner or outer rotor surface, inset or buried permanent magnet synchronous machine
• Geometry is not defined by CAD import but with overlays (cf website)
© 2013- EOMYS ENGINEERING / 121, rue de Chanzy 59260 Lille-Hellemmes FRANCE / contact@eomys.com
A few figures about MANATEE:
• Up 40 dB acoustic noise reduction after redesign based on EOMYS consulting activities
• Successfully applied on both synchronous & induction machines, inner & outer rotor, from W to MW range
• more than 120 validation simulation projects
• more than 120 graphical post-processings
• ~20000 code lines (without counting comments)
Our main references:
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6
Magnet /
current
excitations
ELECTROMAGNETIC
MODULE
ELECTRICAL
MODULESTRUCTURAL
MODULE
ACOUSTIC
MODULE
MANATEE software contains the following modules:
Dynamic
vibrationsVariable
speed noise
level
Geometry
and control
parameters
VARIABLE SPEED MODULEMULTI-SIMULATION MODULE
OPTIMIZATION MODULE
3D force
distribution
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II. ELECTRICAL MODEL
EQUIVALENT CIRCUIT
Option 1: Simulink® PWM block
Option 2: Numerically generated PWM
Phase voltage
waveforms
PWM MODEL
User defined
voltage waveforms
Phase current
waveforms
User defined
current waveforms
• PWM model with several strategies (synchronous, asynchronous, calculated, full wave)
• No strong circuit coupling for the moment
Machine and
converter input
parameters
User defined
equivalent circuit
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8
MANATEE electromagnetic model relies on the fast calculation of the airgap radial and
tangential flux density with the following modelling methods :
• Permeance / magnetomotive force (MMF) analytical models
• Subdomain semi-analytical models
• Finite element non linear magnetostatic model (FEMM)
The permeance / MMF decomposition based on winding functions allows to include PWM
harmonics, skewing and geometrical asymmetries (eccentricities, non uniform airgap) and faults
(broken bars, short-circuits) within a few seconds of calculation.
The subdomain models also allows to include PWM harmonics and skewing within a few
seconds of calculation, but does not not account for uneven airgap and eccentricity.
III. ELECTROMAGNETIC MODEL
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Permeance/ MMF Subdomain FEMM
Calculation time ++ + -
Tangential field calculation No Yes Yes
Robustness to geometry + + ++
Skewing (multislice) Yes Yes Yes
Saturation Yes (saturated
permeance waves)
No Yes
Eccentricities & uneven airgap Yes No No
Faults (e.g. short circuits, broken
bar, demagnetization)
Yes No* No*
Topologies IPMSM**
SPMSM
SCIM
DFIM
IPMSM**
SPMSM
SCIM
DFIM
IPMSM
SPMSM
SCIM (no-load)
DFIM
Preferred model for fast
vibroacoustic analysis in healthy
variable speed operation
*can be modelled but not included yet in MANATEE
**fast hybridation with FEA
Subdomain model on SPMSM:
Permeance/mmf model on SCIM:
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Model hybridation is possible in MANATEE such as
• Calculation of mmf using non-linear FEMM (e.g. rotor mmf for interior magnet
machines)
• Calculation of permeance using non-linear FEMM (e.g. saturation effects, notch effects,
magnetic wedges)
Recommended models in symmetrical healthy case:
Permeance/mmf
SCIM SPMSM, IPMSM, BPMSM
Subdomain
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• Any winding type can be modelled (integral, fractional, user-defined, multiphase)
• A winding pattern defined in Koil freeware can also be imported
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• High accuracy and fast subdomain model for synchronous machine:
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• Automatic coupling with FEMM finite element software (symmetries, boundary conditions) in order
to model more complex problems (e.g. shaped magnets, saturation effects)
Finite element linear
magnetostatics
(FEMM)
5 min
MANATEE subdomain models
0.1 s
spacetimetime
space
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Option 1: 3D ANALYTICAL PERMEANCE / MMF MODEL User defined flux
distribution
Phase current
waveforms
Option 2: 3D SEMI-ANALYTICAL SUBDOMAIN MODEL
Option 3: 2,5D FINITE ELEMENT MODEL (FEMM)
Analytical mmf in linear case using
winding function model
Analytical permeance incl.
geometrical assymetries (e.g.
uneven airgap, eccentricities)
FEA permeance incl. saturation,
magnetic wedges, notches…
Harmonic
magnetic forcesAirgap time and
space flux
distribution
PROJECTION
TOOL
Radial and tangential
forces FFT2
r=2
r=3
…
FEA mmf including non linearities
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S=Enveloppe fermée
Dynamic radial
deflections
Option 1: 2,5D ANALYTICAL CYLINDER MODEL
Static radial deflections incl.
tooth-induced moments
Natural frequencies of the circumferential
modes of an equivalent ring
User defined natural
frequencies (e.g. experimental
data)
Natural frequencies
automatically calculated by
FEM (GetDP) on a 3D model
FRF calculation of main spatial
orders of magnetic forces
Dynamic radial deflections
Vibration synthesis of radial
deflections
Option2: 3D FINITE ELEMENT STRUCTURAL MODEL
GetDP (free) or Optistruct (commercial)
Harmonic
magnetic forces
IV. STRUCTURAL MODEL
BASIC DESIGN
DETAILED DESIGN
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Tangential and radial harmonic
magnetic forces (magnitude,
wavenumber, frequency, phase)
3D airgap time and
space flux
distribution
HARMONIC DECOMPOSITION
r=2 r=3
ELECTROMAGNETIC
MODEL
r=0
STRUCTURAL FEA
MODEL
Unit harmonic
loads for
wavenumber r=0,
±2, ±4 … STRUCTURAL FREQUENCY
RESPONSE FUNCTIONS
Motor and frame
modal basis
r=0 r=2
VIBRATION SYNTHESIS
Complex FRFs (radial &
tangential) for each
wavenumber r
Spectrograms
Vibration level
Operational Deflection Shapes
Modal contribution
Radiating surface velocities
Electromagnetic Vibration Synthesis
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Coupling with structural FEM tool Optistruct:
• Possibility to automatically couple an existing FE model of Optistruct
with any other electromagnetic software, or to rebuild a lamination
model from scratch:
• circular lamination with any slot geometry (possibility to simplify
the slot geometry to have a lighter structural model)
• application of physics: orthotropic properties, winding mass
• application of boundary conditions (e.g. clamped/clamped,
free/clamped, fixed nodes)
• meshing based on the number of nodes in the different regions
• Automated magnetic force application (load collectors)
• Vibration synthesis post-processing
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Coupling with structural FEM tool based on open-source GetDP
software:
• Automated mesh generation using Gmsh
• Automated identification of coupled circumferential / longitudinal modes
with different boundary conditions
• Modal shape selector to visualize the modes and validate the automated
modal identification
(2,0)
(3,0)
(4,0)
(0,0)
(2,1)
(3,1)
(4,1)
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CLAMPED – FREE
Boundary conditions
FREE – FREE
Boundary conditions
Resulting modal basis (simplified representation of cylindrical modes – « tooth rocking modes » are
included):
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Dynamic radial
deflections
SEMI-ANALYTICAL ACOUSTIC MODEL
Radiation efficiency of an equivalent cylinder
V. ACOUSTIC MODEL
Sound power level
Sound pressure level
2D (analytical) or 3D (FEM) spatial-averaged
vibration velocity
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VI. ADVANTAGES
• Fast variable speed vibroacoustic calculation (from <1 sec to 1 mn) based on efficient
calculation methods even with 3D effects and converter harmonics
• High frequency acoustic calculations (up to 20 kHz) within seconds, contrary to numerical
approaches
• Several industrial validations of the vibroacoustic model
• Advanced harmonic post-processings to understand the root cause of acoustic noise and
find design improvements
• Possibility of decoupling electromagnetics & structural mechanics to perform efficient NVH
optimization (e.g. pole shaping, current injection)
• Coupling with your own Matlab/Python scripts
• Extensive online documentation with tutorials and validation cases
20
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VII. VALIDATIONS AND DOCUMENTATION
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• A full website is dedicated to MANATEE validations, post-processings, and tutorials:
www.manatee-software.com
• All modules are validated using special validation projects which can be run and modified by
the user:
>>run_MANATEE(‘EM_SPMSM_NL_001');
• Validation cases are daily tested on the current version of MANATEE
• The input and output simulation data are stored in structures and substructures which are
documented in an Excel file
• Three main tutorials for the electromagnetic and vibroacoustic simulation of squirrel cage
induction machines, interior and surface PMSM
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EXAMPLES OF VIBRO-ACOUSTIC VALIDATIONSCase of a traction concentrated winding PMSM with interior magnets at partial load (blind test):
Sound level during a run-up
(experiments with gearbox+water-
cooling+converter harmonics)
Sound level during a run-up
(MANATEE simulation without
converter harmonics)
~20 sec on a laptop
TESTS MANATEE
Motor A
Motor B-40 dB
Fast electromagnetic model neglecting saturation can be used in basic design phase to
avoid strong resonances, no need of detailed multiphysic numerical models
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Case of a squirrel cage induction motor for hydraulic pump at no-load:
Sound level during a run-
up
(experiments with PWM +
gearbox +air-cooling)
Sound level during a run-up
(simulation without PWM)
~2 sec on a laptop
15 dB reduction were obtained after redesign with MANATEE
TESTS
MANATEE
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Case of a squirrel cage traction induction machine with Sound Power Level measurements according
ISO3745 in semi-anechoic chamber:
Sound power level during
run-up (including air cooling)
Sound powerl level during a run-
up
(without air cooling)
~2 sec on a laptop
TESTS
MANATEE
Fast vibroacoustic model neglecting 3D effects can be used in basic design phase to avoid
strong resonances, no need of detailed multiphysic numerical models
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VIII. POST PROCESSINGS & PLOT TOOLS
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• MANATEE includes more than 100 plots accessible directly in the command line
• Example of Matlab
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26
Geometry, time and space visualization, real and complex spectra for all quantities (permeance,
mmf, radial and tangential flux density, force, acceleration, velocity, displacements)
-2000
0
2000 -100
0
100
0
0.5
1
1.5
Spatial order [r]Frequency [Hz]
Magnit
ude [
T]
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Visual fitting tool for B(H) curve model at high excitation field
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28
Magnetic harmonic forces analysis with automated identification of lines expression
-8-7-6-5-4-3-2
-10 1 2 3 4 5 6 7 8
1000
2000
3000
0
5000
10000
15000
f=4fs=382 Hz
r=6
f=2fs=191 Hz
r=3
spatial order [r]
f=22fs=2099 Hz
r=6 f=20fs=1908 Hz
r=3
f=5fs=453 Hz
r=-3
Airgap radial force FFT2
f=3fs=262 Hz
r=-6
f=16fs=1526 Hz
r=-3 f=14f
s=1336 Hz
r=-6
Frequency [Hz]
r [
N/m
m2
]
(PMSM)(SCIM)
Wavenumber
Wavenumber
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29
Magnetic harmonic forces analysis
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Automated analysis of magnetic force waves in open circuit / no-load and partial load
>> find_harmonic_PMSM_open_circuit(2,10f,p=5,Zs=12)
Force wave {f=10fs, r=2} is created by the product of flux waves
B1=P1.F1 and B2=P2.F2 such as:
B1={0,0}.{9fs,9p} and B2={0,-4Zs}.{fs,p}
B1={0,0}.{fs,p} and B2={0,-4Zs}.{11fs,11p}
B1={0,0}.{7fs,7p} and B2={0,-4Zs}.{3fs,3p}
B1={0,0}.{5fs,5p} and B2={0,-4Zs}.{5fs,5p}
B1={0,0}.{3fs,3p} and B2={0,-4Zs}.{13fs,13p}
B1={0,0}.{5fs,5p} and B2={0,-4Zs}.{15fs,15p}
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Static (top) and dynamic (bottom) radial vibration spectra
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Spectrogram of radial / tangential force harmonics for each spatial wavenumber
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Spectrogram of radial / tangential force harmonics of a given order, including rotation direction
Operational deflection shapes at a given frequency
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Plot of tangential and radial forces per tooth in time and frequency domain
r=0 r=2 r=3
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Space vector diagram to analyze the origin of a radial or tangential force harmonic in terms of flux
density waves
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Space vector diagram to analyze the origin of a radial or tangential flux density in terms of
permeance and magnetomotive force waves
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Possibility to visualize the modal basis under Gmsh (freeware)
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Modal contribution to acoustic and vibration spectra
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Contribution of each structural mode to the acoustic noise at variable speed
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Spectrogram and order analysis with automatic identification of main magnetic force
harmonics orders and frequencies
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« Spatiogram » noise analysis: decomposition of acoustic noise spectrogram per force
wavenumber
=
r=0
r=2
+ +…
r=4
+
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Order analysis per circumferential vibration wavenumber (including rotation direction)
r=0 r=1
r=+2r=-2
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0 100 200 300
-250
-200
-150
-100
-50
0
50
Phasor diagram of SPL at frequency 3260 Hz
Phasor diagrams to analyze the modal contribution to acoustic noise at a given frequency
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Unbalanced magnetic pull calculation (example of the slotting effect on eccentric UMP
including skew of the stator)
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0 2000 4000 600050
100
150
200
250 2-t
h
3-t
h
4-t
h
Frequency [Hz]
Supply
fre
quency [
Hz]
SPL [dBA]
0
10
20
30
40
50
60
Listen to your electrical machine (direct sound synthesis)
Verification of the MANATEE synthesized sound using AudacityMANATEE
spectrogram
resonanc
e
resonance
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is_mmfs
is_ideal_mmfs
is_mmfr
is_ideal_mmfr
is_slotS
is_slotR
LwrA
LwrA_max
is
mm
fs
isid
eal m
mfs
ism
mfr
isid
eal m
mfr
isslo
tS
isslo
tR
Lw
rA
Lw
rAm
ax
corr factor
0
0.2
0.4
0.6
0.8
1
Automated harmonic source analysis
High correlation between maximum noise
level and rotor slotting harmonics
High correlation between maximum noise level
and rotor mmf
Low correlation between maximum noise level
and stator winding armature spatial harmonics
High correlation between maximum noise
level and nominal noise level
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Mutisimulation Viewer for post processing sensitivity & optimization results
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IX. LIST OF MODULES
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MODULE NAME FUNCTION DETAILED DESCRIPTION
EL.SCIMElectrical model for inner rotor squirrel cage
induction machines
Calculates the stator and rotor currents based on input phase voltage waveform by calculating
the equivalent circuit parameters, including skin effect and saturation effects.
Some parameters (leakage and magnetizing inductance) can be evaluated with finite element
(coupling with FEMM) if the module EM3 is activated.
EL.DFIMElectrical model for inner rotor doubly fed
induction machines
Calculates the stator and rotor currents based on input phase voltage waveform by calculating
the equivalent circuit parameters, including skin effect and saturation effects.
Some parameters (leakage and magnetizing inductance) can be evaluated with finite element
(coupling with FEMM) if the module EM3 is activated.
EL.PMSMElectrical model for surface, inset and buried
permanent synchronous machines
Calculates the stator currents based on input phase voltage waveform by calculating the
equivalent circuit parameters (inductances Ld, Lq, flux linkage E), including skin effect and
saturation effects. Some parameters (leakage and magnetizing inductances) can be evaluated
with finite element (coupling with FEMM) if the module EM3 is activated.
Electrical modules (3)
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MODULE NAME FUNCTION DETAILED DESCRIPTION
CT1.SCIMControl module for squirrel cage induction
machines
Calculates the slip and voltage to achieve specified torque characteristics based on the
equivalent circuit parameters.
CT1.DFIMControl module for doubly fed induction
machines
Calculates the slip and voltage to achieve specified torque characteristics based on the
equivalent circuit parameters.
CT1.SM Control module for synchronous machinesCalculate the current angle to achieve specified torque based on the equivalent circuit
parameters according to MTPA strategy.
CT2.PWM PWM moduleGenerates 3-phase PWM voltage waveforms for asynchronous and synchronous modes,
analytically or based on a Simulink model.
CT2.CI Harmonic current injection module Allows to inject id or iq harmonic currents.
Control modules (5)
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50
MODULE NAME FUNCTION DETAILED DESCRIPTION
EM1.IM
Electromagnetic analytical module based on
permeance / mmf and winding functions for squirrel
cage or doubly fed induction machines
Calculates the airgap rotor and stator radial flux density time and space distribution based on permeance /
mmf model. Includes rotor and stator skewing (any skew shape), uneven airgap and eccentricities effects,
broken bar and short circuit effects, integral and fractional slot windings.
EM1.PMSM
Electromagnetic analytical module based on
permeance / mmf and winding functions for inset,
surface and buried PM synchronous machines
Calculates the airgap rotor and stator radial flux density time and space distribution based on permeance /
mmf model. Includes stator and rotor skew (any shape), uneven airgap, pole displacement and eccentricities
effects, demagnetization and short-circuit effects, integral and fractional slot windings.
EM2.IM
Electromagnetic semi-analytical module for inner rotor
squirrel cage or doubly-fed induction machine at no-
load
Calculates the airgap rotor and stator radial and tangential flux density time and space distribution based on
subdomain models. Includes armature field with any winding type and skewing effect. Assumes semi
opened slots with polar geometry.
EM2.SPMSMElectromagnetic semi-analytical module for surface
permanent magnet synchronous machines
Calculates the airgap rotor and stator radial and tangential flux density time and space distribution based on
subdomain models. Includes armature field with any winding type and skewing effect. Assumes semi
opened slots with polar geometry and tile shape magnets.
EM2.IPMSMElectromagnetic semi-analytical module for inner rotor
inset permanent magnet machines
Calculates the airgap rotor and stator radial and tangential flux density time and space distribution based on
subdomain models. Includes armature field with any winding type and skewing effect. Limited to polar
geometries with semi opened slots and tile shape magnets.
EM2.BPMSMElectromagnetic semi-analytical module for buried
(interior) permanent magnet machines
Calculates the airgap rotor and stator radial and tangential flux density time and space distribution based on
subdomain models. Includes armature field with any winding type and skewing effect. Limited to polar
geometries with semi opened slots and tile shape magnets.
Electromagnetic modules (9)
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51
MODULE NAME FUNCTION DETAILED DESCRIPTION
EM3.PMSM
Electromagnetic finite element module for surface,
inset or buried permanent magnet synchronous
machines
Couples MANATEE with open-source electromagnetic software FEMM for non linear or linear
magnetostatics problem (automatic drawing, meshing and post processings - torque, flux, emf,
inductances).
Calculates the airgap radial and tangential flux density time and space distribution, flux linkage, leakage
and magnetizing inductances.
EM3.SCIMElectromagnetic finite element module for inner rotor
squirrel cage induction machines at no-load
Couples MANATEE with open-source electromagnetic software FEMM for no-load non linear or linear
magnetostatics problem (automatic drawing, meshing and post processings - torque, flux, emf,
inductances).
Calculates the airgap radial and tangential flux density time and space distribution, flux linkage, leakage
and magnetizing inductances. Includes skewing effect.
EM3.DFIMElectromagnetic finite element module for inner rotor
doubly-fed induction machines
Couples MANATEE with open-source electromagnetic software FEMM for no-load non linear or linear
magnetostatics problem (automatic drawing, meshing and post processings - torque, flux, emf,
inductances).
Calculates the airgap radial and tangential flux density time and space distribution, flux linkage, leakage
and magnetizing inductances. Includes skewing effect.
Electromagnetic modules (9)
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52
MODULE NAME FUNCTION DETAILED DESCRIPTION
SM1Structural mechanics analytical module for
modal analysis
Calculates the natural frequencies of an equivalent cylinder including longitudinal modes.
Calculates the dynamic radial deflections of the external structure with an equivalent 2D ring
model.
Calculates the wavenumber and frequency of main magnetic force harmonics.
SM2Structural mechanics finite element module for
modal analysis and FRF using free GetDP
Couples MANATEE with open-source structural FEA software GetDP and mesher Gmsh to
calculate the mode shapes of a 3D external stator structure including winding weight, as well as
the frequency response function (FRF) of the 3D structure under different magnetic force
patterns and calculates the resulting dynamic deflection of the structure.
SM3
Structural mechanics finite element module for
modal analysis and FRF using commercial
Optistruct software
Couples MANATEE with structural FEA software Optistruct and mesher HyperMesh to calculate
the mode shapes of a 3D external stator structure including winding weight, as well as the
frequency response function (FRF) of the 3D structure under different magnetic force patterns
and calculates the resulting dynamic deflection of the structure.
Structural modules (3)
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53
MODULE NAME FUNCTION DETAILED DESCRIPTION
AC1 Acoustics analytical moduleCalculates the radiation factor of the external structure, the sound power level and sound
pressure level radiated by the machine based on analytical models.
AC.pp Acoustics post-processor module
Post-process acoustic calculations (A-weighting, sound power and sound pressure levels,
modal participation factors, sonagrams, order tracking analysis). Builds synthesized sonagrams
and spectrograms from a single speed simulation to obtain a variable speed vibroacoustic
simulation in less than 1 s of calculation.
Acoustic modules (2)
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54
MODULE NAME FUNCTION DETAILED DESCRIPTION
VS1 Variable speed moduleCalls several fixed-speed simulations with varying input parameters depending on the control
strategy (e.g. constant flux, torque/speed curve, etc)
MS1 Multisimulation module
Calls several times MANATEE by varying input parameters (e.g. to study the effet of the pole
width or the slot numbers on noise) including correlation analysis between design variables and
response variables.
OP2 Multiobjective optimization module
Couples MANATEE with a global optimization tool (NSGA-II) for constrained multiobjective
mixed variable optimization, or with local optimizer (SQP) for local single objective optimization.
Includes all post processings (2D and 3D Pareto visualization).
OP1 Sensitivity analysis moduleCalculates the sensitivity of a response variable with respect to design variables and quantify
the correlation factors, using different sampling strategy of the design space to be explored.
Variable speed & multi-simulation modules (4)
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55
MODULE NAME FUNCTION DETAILED DESCRIPTION
OP1 Sensitivity analysis module Calculates the sensitivity of a response variable with respect to design variables.
OP2 Multiobjective optimization moduleCouples MANATEE with a global optimization tool (NSGA-II) for constrained multiobjective
mixed variable optimization, and local optimization (SQP) for single objective optimization.
OP.pp Optimizer post processor
Post-processings of optimization results (Pareto front in 2D and 3D dimensions, correlation
analysis of constraints, response and design variables, plot in design variable and response
variable spaces).
Optimization modules (3)
© 2013- EOMYS ENGINEERING / 121, rue de Chanzy 59260 Lille-Hellemmes FRANCE / contact@eomys.com
KEYWORDS:
MAGNETIC NOISE
MAGNETIC ACOUSTIC NOISE
ELECTROMAGNETIC ACOUSTIC NOISE
ELECTRICAL NOISE
AUDIBLE ELECTROMAGNETIC NOISE
MAGNETICALLY-INDUCED VIBRATION
ELECTROMAGNETICALLY INDUCED NOISE
WHINING NOISE
HIGH PITCH NOISE
HUMMING NOISE
TONAL NOISE
MAGNETIC VIBRATION
ELECTROMAGNETIC VIBRATIONS
DEFLECTION
MECHANICAL DEFORMATION
MAXWELL FORCE
MAXWELL TENSOR
MAGNETIC FORCE
ELECTROMAGNETIC FORCES
UNBALANCED MAGNETIC PULL UMP
VIBRATIONAL BEHAVIOUR
NOISE MITIGATION
NOISE CONTROL
VIBRATION REDUCTION
TOOTH WINDING
CONCENTRATED WINDING
FRACTIONAL SLOT WINDING
DISTRIBUTED WINDING
SHORTED PITCH WINDING
MAGNETOMOTIVE FORCE MMF
WINDING FUNCTION
SKEW
SLOT INCLINATION
STEP-SKEW
SUBDOMAIN MODEL
PERMEANCE / MMF MODEL
PERMEANCE / CURRENT LINKAGE MODEL
PMSM IPMSM SM IM SRM SYNRM DFIG
SYRM
INTERIOR BURIED EMBEDDED MAGNETS
SYNCHRONOUS MACHINES
PERMANENT MAGNET
ASYNCHRONOUS MACHINE
SQUIRREL CAGE INDUCTION MACHINE
DOUBLY FED INDUCTION GENERATOR
ELECTRICAL MACHINES
SWITCHED RELUCTANCE MACHINES
SYNCHRONOUS RELUCTANCE MOTOR
BRUSHLESS AC MOTOR
BRUSHLESS DC MOTOR
DC SERVOMOTORS
ALTERNATOR
SPINDLE MOTOR
ELECTRIC POWERTRAIN
OUTRUNNER MOTOR
FOURIER TRANSFORM
FORCE HARMONICS
HARMONIC REDUCTION
WAVENUMBER
NODE NUMBER
POLE PAIR NUMBER
SPATIAL ORDER
PULSATING ROTATING PROGRESSIVE
STANDING WAVE
RESONANCE
NATURAL FREQUENCY
STRUCTURAL MODE
MODAL BASIS
MAGNIFICATION
DAMPING
HYBRID ELECTRIC CAR
ELECTRIC BUS
ELECTRIC BICYCLES
ELECTRIC SCOOTER
ELECTRODYNAMIC
MOTS-CLEFS:
BRUIT MAGNETIQUE
BRUIT ACOUSTIQUE D’ORIGINE MAGNETIQUE
BRUIT ELECTROMAGNETIQUE
BRUIT AUDIBLE ELECTROMAGNETIQUE
BRUIT ELECTRIQUE
BRUIT HAUTE FREQUENCE
BRUIT DE SIRENEMENT
BRUIT TONAL
VIBRATION MAGNETIQUE
VIBRATIONS ELECTROMAGNETIQUES
DEPLACEMENT
DEFORMATION MECANIQUE
FORCE DE MAXWELL
TENSEUR DE MAXWELL
EFFORTS MAGNETIQUES
FORCES ELECTROMAGNETIQUES
BALOURD MAGNETIQUE
COMPORTEMENT VIBRATOIRE
REDUCTION DE BRUIT
CONTRÖLE DE BRUIT
REDUCTION DES VIBRATIONS
BOBINAGE DENTAIRE
BOBINAGE CONCENTRE
BOBINAGE FRACTIONNAIRE
BOBINAGE DISTRIBUE
BOBINAGE A PAS RACCOURCI
FORCE MAGNETOMOTRICE FMM
FONCTIONS DE BOBINAGE
VRILLAGE
INCLINAISON DES ENCOCHES
PAS DE VRILLAGE
MODELE DE SOUS DOMAINE
PERMEANCE / MMF
MSAP MAS MRV MS MADA
AIMANTS ENTERRES INSERES
MACHINES SYNCHRONES
AIMANTS PERMANENTS
MACHINES A INDUCTION
MACHINES ASYNCHRONES A CAGE D’ECUREUIL
MACHINE ASYNCHRONE A DOUBLE
ALIMENTATION
MACHINES ELECTRIQUES
MACHINES A RELUCTANCE VARIABLE
MACHINES SYNCHRORELUCTANTES
MOTEUR BRUSHLESS
SERVOMOTEUR
ALTERNATEUR
TRANSFORMEE DE FOURIER
HARMONIQUE DE FORCE
REDUCTION DES HARMONIQUES
NOMBRE D’ONDE
NOMBRE DE NŒUDS
NOMBRE DE PAIRES DE POLES
ORDRE SPATIAL
ONDE TOURNANTE PULSANTE PROGRESSIVE
STATIONNAIRE
RESONANCE
FREQUENCE NATURELLE
MODE DE STRUCTURE
BASE MODALE
AMPLIFICATION
AMORTISSEMENT
VOITURE ELECTRIQUE HYBRIDE
BUS ELECTRIQUE
VELO ELECTRIQUE
SCOOTER ELECTRIQUE
© 2013- EOMYS ENGINEERING / 121, rue de Chanzy 59260 Lille-Hellemmes FRANCE / contact@eomys.com
ACOUSTIC FEA
MODEL
Unit radiating surface
displacementsACOUSTIC FREQUENCY
RESPONSE FUNCTIONS
Acoustic Transfer
Vector (ATV)
m=0 m=1
SOUND SYNTHESIS
Complex FRFs for
each structural mode
(MATV)
Sonagrams
Sound Power Level
Directivity patterns
Modal contributions
Modal contributions
from vibration synthesis
VIBRATION SYNTHESIS
APPENDICES
© 2013- EOMYS ENGINEERING / 121, rue de Chanzy 59260 Lille-Hellemmes FRANCE / contact@eomys.com
• The permeance / mmf and winding function model allows to make a fast analysis of the effects
of skewing, rotor and stator asymmetries (e.g. tolerances, segmentation, gaps, weldings), rotor
dynamic and static eccentricities, saturation, interturn short circuit, and broken bar for squirrel
cage machines
-0.1 0 0.1
-0.2
-0.1
0
0.1
0.2
stator shape
symmetrical
deformed
-0.1 0 0.1
-0.2
-0.1
0
0.1
0.2
rotor shape
symmetrical
deformed+eccentric
Example of the vibroacoustic effect of stator segmentation or rotor tolerance
circular airgapnon circular airgap
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0 1 2 3 4 5 6 7-1
-0.5
0
0.5
1
angle [rad]
air
gap r
adia
l fl
ux d
ensi
ty [
T]
with saturation
without saturation
Example of the effect of additional permeance harmonics due to saturation in induction machines
© 2013- EOMYS ENGINEERING / 121, rue de Chanzy 59260 Lille-Hellemmes FRANCE / contact@eomys.com
Sound Power Level at variable speed
Case of a squirrel cage induction machine
Zr=96 Zs=84 p=4
Frequency f=fs(Zr/p+2)
Order r=Zr-Zs+2p=-4
Frequency f=fs(Zr/p+4)
Order r=Zr-Zs+4p=+4
WITHOUT SATURATION
WITH SATURATION
VARIABLE SPEED NOISE CALCULATED IN 1 sec
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0 200 400 600 800 10000
20
40
60
80
100
120
Frequency [Hz]
Accele
rati
on level [d
B R
e 1
e-6
m/s2
]
Radial acceleration spectum
0 200 400 600 800 10000
20
40
60
80
100
120
Frequency [Hz]
Accele
rati
on level [d
B R
e 1
e-6
m/s2
]
Radial acceleration spectum
Healthy condition Broken bar
Example of the vibroacoustic effect of a broken bar in a squirrel cage induction machine
© 2013- EOMYS ENGINEERING / 121, rue de Chanzy 59260 Lille-Hellemmes FRANCE / contact@eomys.com
Example of the vibroacoustic effect of an interturn short circuit
New noise & vibration line
© 2013- EOMYS ENGINEERING / 121, rue de Chanzy 59260 Lille-Hellemmes FRANCE / contact@eomys.com
Example of the vibroacoustic effect of magnetic wedges using permance /mmf model and coupling with FEMM
© 2013- EOMYS ENGINEERING / 121, rue de Chanzy 59260 Lille-Hellemmes FRANCE / contact@eomys.com
Example of the effect of skew of rotor slots (or stator slot) on the maximum acoustic noise level
0 0.5 1 1.5 250
60
70
80
90
100
110
rotor skew pitch in stator slot pitch
sound p
ow
er
level (d
BA
)
This sensitivity study is done on the maximum noise level at variable speed as a function of the
rotor skew angle. Its calculation takes less than 2 min.
© 2013- EOMYS ENGINEERING / 121, rue de Chanzy 59260 Lille-Hellemmes FRANCE / contact@eomys.com
• Special algorithm based on winding functions & subdomain models to decrease CPU time:
65
Full time and space airgap radial and tangential flux distribution due to armature field (suitable with PWM current harmonics):
• standard subdomain algorithm: 40s
• optimized algorithm: 0.8s
© 2013- EOMYS ENGINEERING / 121, rue de Chanzy 59260 Lille-Hellemmes FRANCE / contact@eomys.com
Automated phasor diagram and various control strategies (torque speed curve, MTPA, etc)
top related