2020 03 10 manatee presentation en

© 2013-2019 EOMYS ENGINEERING / 121 rue de Chanzy CS10128 59030 Lille Cedex FRANCE / www.eomys.com / contact@eomys.com
MANATEE® SIMULATION SOFTWARE
Magnetic Acoustic Noise Analysis Tool for Electrical Engineering

MANATEE is the only software specialized on the electromagnetic design optimization of electrical
machines including magnetic vibrations and acoustic noise due to Maxwell forces (“e-NVH”).
• - fast e-NVH calculations in early electromagnetic design loops
• - faster & more physical e-NVH calculations in detailed mechanical design phase
• - advanced post-processing for e-NVH root cause analysis
• - mechanical & magnetic fault simulation for e-NVH robust design
• - design optimization environments of e-NVH mitigation techniques
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stator/rotor skewing pole/slot shaping current injection stator/rotor notching randomized PWM
OVERVIEW OF MANATEE FOR E-NVH

MANATEE is the central point for the integrated e-NVH design process of electric motors,
from basic vibro-acoustic design at e-motor level to detailed vibro-acoustic design at system level:
3
Third-party sound
quality tools
Third-party electromagnetic
design tools
Third-party structural
design tools
Third-party acoustic
design tools
Standalone e-motor NVH
solution (electromagnetics
+vibro-acoustics)
©Actran
©Oros
©Jmag
©Ansys
Third-party NVH data
acquisition tools
©Oros
optional
v1.09.1 coupling
v1.09.2 coupling

MANATEE technology is
• Matlab®-based for solver (R2013 or later) – no use of any Matlab toolbox
• Python/Qt-based for for machine & simulation set-up GUI
Following radial flux electrical machine topologies are included in MANATEE v1.08:
• Inner or outer rotor SPMSM, ISPMSM, IPMSM (including multilayer magnets)
• SynRM, SRM, WRSM (salient pole, smooth pole uneven slot), SCIM, DFIM
• MANATEE fast magnetic models are based on geometrical layouts (cf. website)
• New lamination shapes can be implemented by EOMYS upon request

MANATEE v1.09 graphical environment:
Scripting
environment
(Matlab)
Simple command line
post-processings
(Matlab)
GUI for simulation
set-up (Python)
no Matlab toolbox needed
GUI for machine set-
up (Python) based on
PYLEECAN

A few figures about MANATEE:
• Up 40 dB acoustic noise reduction after redesign based on EOMYS consulting activities
• Successfully applied on more than 80 industrial cases with IPMSM, SCIM, WRSM, DFIG, inner & outer
rotor, from W to MW range, from 5 rpm to 150 000 rpm, from 10mm to 10m diameter machines
• More than 100 multiphysic validation simulation projects open to MANATEE users
• More than 120 graphical post-processing commands (such as plot_machine) to ease e-NVH root
cause analysis
Naval

7
Magnet /
current
excitations
ELECTROMAGNETIC
MODULE
ELECTRICAL
MODULE
STRUCTURAL
MODULE
ACOUSTIC
MODULE
MANATEE software seamlessly integrates the following multiphysic modules:
Dynamic
vibrations
Variable
speed NVH
Geometry
and control
parameters
3D force
distribution
THERMAL MODULE
VARIABLE SPEED MODULE
MULTI-SIMULATION MODULE
OPTIMIZATION MODULE
• Interface between physics are pre-defined in standard simulation workflows adapted to V-model
development cycle of electrical machines
• All module inputs can be user-defined / imported, resulting in a flexible simulation workflow
• Module input/output are documented for possible integration in third-party scripts
WF.BS
WF.DV

-
E-NVH VARIABLE-SPEED SOLUTIONS
MANATEE carries variable-speed calculations faster than direct calculation approach:
• Quasi static or transient simulation process
• e-NVH calculations on whole torque/speed map
First resonance depends on torque/current level -> due to armature/pole/slot interactions
Second resonance independent of torque/current level -> due to pole/slot interactions (open circuit noise)
EV HEV NVH example of a stepped-skew IPMSM
NVH behaviour is different in traction and braking
VS.QS
VS.TR
VS.MAP

E-NVH ROOT-CAUSE ANALYSIS SOLUTIONS
MANATEE includes predefined root cause analysis post processing:
• Order Tracking based on automated identification of main force wavenumbers:
RCA.PLOT

• Vibration & noise spectrograms including non-linear run-up up to 20 kHz:
RCA.PLOT

• Force, vibration & noise spatiograms (spectrograms per force wavenumber / direction / rotor or
stator application)
RCA.PLOT

2000 2500 3000 3500 4000 4500 5000
Rotation speed [rpm]
0
10
20
30
40
50
60
70
80
90
SWLmagnitude[dBAre.1pW]
Outer radial contribution
r=-1, s=0
r=1, s=0
r=0, s=0
r=-4, s=0
r=4, s=0
r=-3, s=0
r=3, s=0
r=2, s=0
r=-2, s=0
Overall
2000 2500 3000 3500 4000 4500 5000
0
10
20
30
40
50
60
70
80
90
Outer tangential contribution
r=0, s=0
r=-4, s=0
r=4, s=0
r=1, s=0
r=-1, s=0
r=-3, s=0
Overall
2000 2500 3000 3500 4000 4500 5000
0
10
20
30
40
50
60
70
80
90
Inner radial contribution
r=1, s=0
r=-1, s=0
Overall
2000 2500 3000 3500 4000 4500 5000
0
10
20
30
40
50
60
70
80
90
Inner tangential contribution
r=1, s=0
r=-1, s=0
Overall
• Contribution of structural modes and magnetic force wavenumbers to vibration & noise
RCA.PLOT

• Automated offline analysis of main magnetic force waves based on load state, topology and
slot/pole combination:
RCA.HARM
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>> find_harmonic_PMSM(5, 12)
Stress waves observed in stator frame {f=2fs, r=-2} (H10) are created by the product of flux waves
B1=P1.F1 and B2=P2.F2 such as (incl. tooth modulation effect, excl. PWM & phase belt time harmonics):
B1={0,0}.{fs,p} and B2={0,0}.{fs,p} due to Br*Br flux interactions
B1={0,0}.{3fs,3p} and B2={0,0}.{fs,p} due to Br*Br flux interactions
B1={0,0}.{fs,p} and B2={0,0}.{fs,p} due to Br*Bs flux interactions
B1={0,0}.{3fs,3p} and B2={0,0}.{fs,p} due to Br*Bs flux interactions
Stress waves observed in stator frame {f=4fs, r=-4} (H20) are created by the product of flux waves
Stress waves observed in stator frame {f=4fs, r=2} (H20) are created by the product of flux waves
B1={0,0}.{3fs,3p} and B2={0,0}.{fs,-1} due to Br*Bs flux interactions
B1={0,0}.{3fs,3p} and B2={0,0}.{fs,11} due to Br*Bs flux interactions
Stress waves observed in stator frame {f=6fs, r=6} (H30) are created by the product of flux waves
Example of a 12s10p PMSM (Zs=12, p=5), case of MANATEE command line
Open-circuit force harmonics
Load-related force harmonics
Decreasing
magnitude

E-NVH ROOT CAUSE ANALYSIS SOLUTIONS
• Automated offline analysis of a specific magnetic force wave
RCA.HARM
>> find_harmonic_PMSM_open_circuit_fr(10, 2, 5, 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}
Example of a 12s10p PMSM (Zs=12, p=5): to know how the origin of the force wavenumber r=2 occurring at
f=10fs in open circuit conditions one can simply type:
stator slotting
permeance waves P={f,r}
DC component = {0,0}
rotor magnet
mmf waves F={f,r}
fundamental= {fs,p}
Decreasing
magnitude

• Possibility to appy user-defined harmonic filters on any source (permeance, mmf, flux, force) in
frequency or wavenumber domains
• Automated study of e-motor NVH harmonic sources (rotor/stator winding space harmonics,
rotor/stator slotting, PWM, saturation, eccentricities)
E-NVH ROOT CAUSE ANALYSIS SOLUTIONS RCA.FILT

E-NVH CALCULATION SOLUTIONS
MANATEE can speed-up magnetic load calculations in early design phase:
• Load Extrapolation Algorithm (LEA) extrapolates loads at all speeds based on 1 to 6 single
calculations (saturation of reference operating point is assumed constant over speed)
• LEA reduces numerical parasitic noise as there is no need to interpolate magnetic force
harmonics magnitude between speed (ex: PMSM open circuit, constant Id/Iq…)
ALG.LEA
Single speed calculation
Extrapolation at higher speeds
Extrapolation at lower speeds

E-NVH CALCULATION SOLUTIONS
MANATEE can speed-up magnetic load calculations in detailed design phase:
• Load Interpolation Algorithm (LIA) interpolates flux distribution at variable speed from
specific points along torque/speed curve
• LIA can also interpolate PMSM flux distribution function of Id/Iq to more quickly calculate
magnetic loads under skewing or e-NVH in four quadrant operation
• Flux interpolation is more robust to numerical issues compared to magnetic force interpolation
ALG.LIA
Speed
Torque
5 operating points used for flux
distribution calculation
Load Interpolation Algorithm with fine speed
discretization step (100 operating points)

HARMONIC FORCE PROJECTION
r=1 r=2
MAGNETIC MODEL
r=0
STRUCTURAL MODEL
Unit rotating loads identified with
MANATEE (r=0, ±1, ±2 …)
radial + tangential + moments
applied to stator + rotor
VIBRATION FRF
ELECTROMAGNETIC
VIBRATION SYNTHESIS
2D or 3D external FEA software
MANATEE magnetic models
3D external FEA software
MANATEE structural models
Vibration & noise per load case (numerical TPA)
Air-borne Vs structure-borne noise
Rotor Vs stator noise due torque / radial ripple & UMP
CALCULATIONOF
OPERATIONALLOADS
STRUCTURAL
CHARACTERIZATION
E-NVH CALCULATION SOLUTIONS ALG.EVS
• Electromagnetic Vibration Synthesis: faster than a direct approach, more physical insights
airgap flux
distribution
vibration
velocity field

HARMONIC FORCE PROJECTIONMAGNETIC MODEL
STRUCTURAL MODEL ACOUSTIC FRF
ELECTROMAGNETIC
NOISE SYNTHESIS
2D or 3D external FEA software
MANATEE magnetic models
Vibration & noise per load case
ABN Vs SBN
Numerical TPA
CALCULATIONOF
OPERATIONALLOADS
STRUCTURAL
CHARACTERIZATION
E-NVH CALCULATION SOLUTIONS ALG.ENS
• Electromagnetic Noise Synthesis: faster than a direct approach, more physical insights
airgap flux
distribution
vibration
velocity field
MANATEE structural models
STRUCTURAL FRF
MANATEE acoustic models
r=2
r=2r=0
r=2
Frequency [Hz]
FRFa[dB/N²,re10-12W]
Frequency [Hz]
FRFv[dB/N,re10-9m/s]
r=2
ACOUSTIC MODEL sound
pressure field

E-NVH MITIGATION SOLUTIONS SOL.SKEW
MANATEE includes built-in design environment of skewing technique
• Possibility to define any rotor/stator skew shape
• Automated study of noise & torque ripple minimization tradeoffs using multiobjective
optimization under arbitrary PMSM step-skew angles
• Automated sensitivity study of NVH & torque ripple function of continuous skew angle

E-NVH MITIGATION SOLUTIONS SOL.NOTCH
SOL.CINJ
MANATEE allows investigation of notching & current injection technique
• Rotor / stator notches in electromagnetic models (FEMM, SDM, PMMF)
• Injection of any type of harmonics currents in ABC/DQH frames
• Application of parameter sweep / optimization
current injection stator/rotor notching

E-NVH ROBUST DESIGN SOLUTIONS ROB.FAULT
ROB.NFREQ
MANATEE allows assessment of e-NVH design robustness with respect to faults / manufacturing
tolerances:
• 3D static / dynamic eccentricities (incl. UMP calculation), even after flux import
• Uneven bore radius, even after flux import
• Uneven magnetization or uneven pole position
• NVH effect of speed ripple or strong rotor vibrations
• NVH dispersion due to natural frequencies variations
even pole placement 10% pole displacement

E-NVH IMPORT/EXPORT SOLUTIONS IO.ELEC
IO.FLUX
IO.MF
IO.FRF
IO.WAV
MANATEE import/export solutions allows to integrate MANATEE in existing workflow:
• Import of current distributions (fixed speed, variable speed)
• Import of third party flux density distribution (fixed speed, variable speed, multi slice)
• Import of vibration or sound pressure Frequency Response Functions
• Export of lumped magnetic load vectors (e.g. .unv)
• Export of sound files for use in Sound Quality software
Sound with 4800 Hz PWM Sound with 10000 Hz PWMSound under sine supply

Comparison of simulation results
• Easy comparison per simulation projects, per input parameter, or per electrical machines
• Predefined graphical outputs on all key outputs of each physics (electrical, magnetic, mechanics,
acoustics)
E-NVH LABORATORY LAB.COMP
>>compare_sim_inputs('default_proj','sta_ecc_rate',[0 0.1 0.2 0.5]);

Parameter sweep environment (no Matlab toolbox needed)
• Flexible and quick set-up including user-defined response functions or predefined “getters”
(e.g. sound power level at a certain speed and frequency)
• Specialized command line plot functions
skew rate
E-NVH LABORATORY LAB.SA

Multiobjective constrained optimization algorithm (no Matlab toolbox needed)
• NSGA-II based algorithm, including mixed variables
• Flexible and quick set-up including user-defined response functions or predefined “getters”
(e.g. Maxwell stress component at a certain speed, wavenumber and frequency)
• Possibility to Specialized command line plot functions including 2D, 3D Pareto fronts
E-NVH LABORATORY LAB.CMO

Multidimensional design space explorer
• 5D visualization of parameter sweep & optimization results (design & response variables + constraints)
• Possibility to add additional constraints and filters
E-NVH LABORATORY LAB.MDE

E-NVH ELECTRICAL MODEL OPTIONS
EQUIVALENT CIRCUIT
Option 1: Simulink® PWM block
Option 2: Analytical / numerical PWM
Phase voltage
waveforms
PWM MODEL
User-defined voltage
waveforms
Phase current
waveforms
User-defined current
waveforms
• PWM model with several strategies (SPWM, SVPWM, DPWM0/1/2/3/min/max, GDPWM)
including randomized switching strategies
• No strong circuit (yet) in v1.08
Machine and
converter input
parameters
User-defined
equivalent circuit
CT.VPWM
CT.IPWM
CT.X
EL.X

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MANATEE electromagnetic model relies on the fast calculation of the airgap radial and
tangential flux density with the combination of the following modelling methods :
• Permeance / magnetomotive force analytical models (PMMF)
• Subdomain semi-analytical models (SDM)
• Finite element non-linear magnetostatic model (FEMM)
Import of airgap flux from third-party electromagnetic software is supported.
E-NVH ELECTROMAGNETIC MODEL OPTIONS
EM1.X
EM2.X
EM3.X

Option 1: 2,5D ANALYTICAL PERMEANCE / MMF MODEL User-defined airgap
flux distribution
Phase current
waveforms
Option 2: 2,5D 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…
Airgap time and
space flux
distribution
FEA mmf including non linearities
EM1.X
EM2.X
EM3.X

Permeance/ MMF Subdomain FEMM
Calculation time Very fast Fast Slow
Tangential field calculation No Yes Yes
Torque ripple calculation No* Yes Yes
PWM currents Yes Yes Yes
Robustness to geometry Limited Limited Good
Skewing (multi-slice w/o coupling) Yes Yes Yes
Saturation Limited (saturated
permeance waves for IM)
No (except on
IPMSM rotor**)
Yes
Static and dynamic eccentricities Yes Yes Yes
Uneven airgap Yes Yes No
Pole displacement, demagnetization Yes Yes Yes
Stator short-circuit Yes No* No*
IM broken bar Yes Yes No*
Topologies IPMSM**
SPMSM
SCIM
DFIM
WRSM**
IPMSM**
SPMSM
SCIM
DFIM
WRSM**
IPMSM
SPMSM
SCIM (no-load)
DFIM
WRSM
*can be modelled but not included yet in MANATEE v1.07
**fast hybridation with FEMM
Subdomain model on SPMSM:
Permeance/mmf model on SCIM:
E-NVH ELECTROMAGNETIC MODEL OPTIONS EM1.X
EM2.X
EM3.X

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 fast electromagnetic models in symmetrical healthy case:
Permeance/mmf
SCIM SPMSM, IPMSM, WRSM, SRM
Subdomain
EM1.X
EM2.X

• Any winding type can be modelled (integral, fractional, user-defined, multiphase)
• A winding pattern defined in Domolites (formerly Koil) freeware can also be imported
EM1.X
EM2.X
EM3.X

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• Comparison between Altair Flux® (FEA) and MANATEE ® (SDM) airgap flux distribution in time and
space on a loaded SPMSM include non-linearity:
EM1.X
EM2.X
time
Flux: ~1 hour MANATEE: ~1 sec
time
airgap angle airgap angle

• Advanced automated coupling with open-source electromagnetic FEA software FEMM
(sliding mesh, symmetries, BC) for detailed design phase or complex geometries
• Possibility to import .dxf geometry in MANATEE or .fem model
• Parallelization over several Matlab instances allows to speed up calculations
(distribution of time steps or skew slices)
• Calculation of airgap flux, inductances, permeances
EM3.X

E-NVH MAGNETIC FORCE CALCULATION OPTIONS
Stator and rotor nodal or lumped
Maxwell harmonic forces and moments
Airgap time and space
flux distribution
MAGNETIC FORCE CALCULATION,
PROJECTION AND 2D FFT
Option 3: Virtual Work Principle nodal
magnetic forces
Integral values such as torque ripple, UMP
r=0 r=2 r=3
• Torque ripple and cogging torque are naturally obtained as a particular case of magnetic forces
• Trade-offs between torque ripple and noise minimization can therefore be obtained with MANATEE
Option 1: Lumped magnetic load vectors
Option 2**: Surface magnetic force
densities
**force calculation not coupled to structural model in v1.08
MF.MLV
MF.LOC
User-defined airgap
Maxwell stress waves

S=Enveloppe fermée
Dynamic
deflections
Option 1: 2,5D ANALYTICAL CYLINDER MODEL
Static radial deflections
Natural frequencies of the circumferential
modes of an equivalent ring
User defined natural frequencies
& damping (e.g. from EMA)
Force application on imported FEA model or
concept stator built from scratch
Average dynamic radial deflections
3D vibration velocity field
Option 2: 3D FINITE ELEMENT STRUCTURAL MODEL
Optistruct / Ansys / Nastran / Abaqus*
E-NVH STRUCTURAL MODEL OPTIONS
BASIC DESIGN
DETAILED DESIGN
Stator and rotor nodal or
lumped Maxwell harmonic
forces and moments
*available in MANATEE v1.09
SM.ANL
SM.NUM1
SM.NUM2

Coupling with third party structural FEA:
• Possibility to automatically call from MANATEE an existing FEA model of Optistruct /
Ansys / Nastran, or to rebuild a lamination model (« concept stator ») 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 using operational magnetic loads from MANATEE
electromagnetic model or third party electromagnetic software
SM.NUM1
SM.NUM2

Validation of MANATEE fast vibration calculations
• Use of semi-analytical equivalent cylindrical shell structural models
Ex: comparison of MANATEE semi-analytic model and Ansys/Optistruct mechanical FEA on EV HEV
electric motor under variable frequency Maxwell stress harmonic of wavenumber r=0, 2, 4
Ansys/Optistruct: ~10 mn
MANATEE: ~1 sec

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Dynamic radial
deflections
Option 1: SEMI-ANALYTICAL ACOUSTIC MODEL
Radiation efficiency of an equivalent cylinder
or unit radiation (ERP)
E-NVH ACOUSTIC MODEL OPTIONS
Sound power level
Sound pressure level
2D (analytical) or 3D (FEM) spatial-averaged
vibration velocity
Sound synthesis .wav
Option 2: NUMERICAL FEA ACOUSTIC MODEL*
Coupling with
*MANATEE v1.09
AC.ANL
AC.NUM
User-defined radiation
efficiency

Validation of MANATEE fast air-borne noise calculation
• Use of semi-analytical equivalent cylindrical shell vibro-acoustic models
Acoustic mesh
at 590Hz
Acoustic mesh
at 2116Hz
Ex: comparison of MANATEE semi-analytic model and 3D FEA on EV HEV e-motor under
variable frequency Maxwell stress harmonic of wavenumber r=2
FEA: ~20 mn
Semi-analytic: ~1 sec

KEY FEATURES OF MANATEE SOFTWARE
• Fast & accurate variable-speed vibroacoustic calculation (from 1 sec to 1 min) based on
efficient calculation methods and parallelization even with 3D effects and converter harmonics
• High frequency acoustic calculations (up to 20 kHz) within seconds, contrary to numerical
approaches
• Large number of NVH root cause analysis post processing tools
• Easy implementation of all e-machine noise and vibration control actions (e.g. current
injection, skewing, pole shaping, notching)
• Pre-defined simulation workflows suitable for all design stages of electrical machines
• Extensive online documentation with tutorials and validation cases
42

MANATEE SOFTWARE DOCUMENTATION
43
• 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

MANATEE SOFTWARE VALIDATIONS
• MANATEE was initially developed to support EOMYS e-NVH consulting activities
• MANATEE has been used internally to analyze more than 100 electric motor noise issues
• MANATEE was successfully applied on wide range of topologies:
- inner and outer rotor, axial and radial flux
- 5 rpm to 150 krpm
- 1 cm to 10 m airgap diameter
- 100 W to 40 MW power
- SRM, BLDC, IPMSM, SPMSM, DFIM, SCIM, SynRM, WRSM
• MANATEE was used on wide range of markets including EV/HEV NVH applications

MANATEE SOFTWARE VALIDATIONS
Case of a traction concentrated winding IPMSM (EV/HEV NVH) at partial load (blind test):
Sound level during a run-up
(experiments with gearbox+water-
cooling+converter harmonics)
(MANATEE simulation without
converter harmonics)
~10 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 at early stage

Case of a squirrel cage induction motor of a naval dredge pump at no-load:
(experiments with PWM +
gearbox +air-cooling)
(simulation without PWM)
~2 sec on a laptop
15 dB reduction reached after redesign with MANATEE (change of rotor slot number)
TESTS
MANATEE
gearbox lines

Case of a railway squirrel cage traction induction machine with Sound Power Level measurements according
ISO3745 in semi-anechoic chamber:
Sound power level during run-
up (including fan noise)
Sound power 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

Case of a salient pole synchronous hydroelectric generator with damper bars
~10 sec on a laptop
TESTS MANATEE
2 resonances

Case of a traction distributed winding IPMSM (EV/HEV NVH) at partial load:
(experiments in non ideal acoustic
conditions)
(MANATEE, coupling with non linear FEMM)
~6 hours on a standard PC
(MANATEE simulation, linear subdomain)
~10 sec on a standard PC
overall
SPL avg 3
micros

Geometry / Currents
(manual - automated import
upon request)
MANATEE INTEGRATION TO E-MACHINE DESIGN WORKFLOW
50
Step 1 : basic electromagnetic + basic vibro-acoustic design loops
Option A. Standalone electromagnetic &
vibroacoustic design optimization
Option B. Coupling with third partly fast
electromagnetic design tools (optional)
Speed, FluxMotor, RPMXpert etc.
• Fast assessment of electrical machines air-borne noise to rank different topologies (ex: SyRM Vs
IPMSM, slot/pole combinations) at variable speed along torque/speed curve under sine supply
• Possibility to drive MANATEE models from Python/Matlab scripts
• First electromagnetic design NVH optimization by implementing electrical noise mitigation
techniques (e.g. skewing, notching, pole shaping, slot/pole combination)
Matlab/Python scripts
Note: these workflows are given as examples, other use may be possible

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Step 2 : detailed electromagnetic + basic vibro-acoustic design loops:
Coupling with third party FEA
electromagnetic design tools
Airgap flux (.xls)
FLUT .mat
or .fem
NVH maps in torque / speed plane
Skew / torque ripple / axial ripple optimization
• Refinement of electromagnetic force calculation compared to MANATEE built-in electromagnetic
models (e.g. 3D FEA magnetic model with magnetic axial forces)
• Fast study of best trade-offs between NVH, torque ripple, losses etc on the whole operating
range using MANATEE flux interpolation, skew pattern optimization, noise maps, sensitivity study
features

52
FRF
Export to third partly sound
quality software (optional)
Coupling with third party FEA
structural software
Sound .wav
Step 3 : detailed electromagnetic + detailed vibro-acoustic design loops:
• Refinement of structural and acoustic calculations using complex structural CAD model including both airborne
and structure borne vibrations based on Electromagnetic Vibration/Noise Synthesis
• Implementation of further NVH minimization focusing on structural solutions (e.g. housing to stator coupling)
• Potential extension to other sources of noise (e.g. gear whine, aerodynamic noise) and sound quality studies
Coupling with third partly FEA
electromagnetic software
forces
vibrations
Airgap flux (.xls)
FLUT .mat
or .fem

MORE OF MANATEE BUILT-IN POST-PROCESSING…
53
• MANATEE includes more than 120 plot commands directly accessible in command line
• Example of Matlab
quick plot command
without arguments

54
Geometry, time and space visualization, real and complex spectra for all quantities (permeance, mmf,
radial and tangential flux density, force, acceleration, velocity, displacements), 2d/3d animation

55
Magnetic harmonic forces analysis with automated identification of lines expression
(PMSM) (SCIM)
Wavenumber

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Magnetic harmonic forces analysis

Static (top) and dynamic (bottom) radial vibration spectra
Possibility to plot frequencies as electrical
or mechanical orders

Spectrogram of radial / tangential force harmonics for each spatial wavenumber

Spectrogram of radial / tangential force harmonics of a given order, including rotation direction
Operational deflection shapes at a given frequency

Plot of tangential and radial forces per tooth in time and frequency domain
r=0 r=2 r=3

CONCLUSIONS
• MANATEE is the only software fully dedicated to the assessment of magnetic forces, magnetic vibrations
and acoustic noise with high number of industrial validations
• MANATEE is the only simulation environment giving physical insights on e-NVH, combining noise
troubleshooting and noise mitigation tools
• MANATEE can be integrated both in pre-sizing and detailed design workflows and provides accelerated
simulation times compared to a direct coupling approach
• MANATEE semi-analytic models and numerical algorithms give no parasitic numerical noise
• MANATEE is highly flexible based on Matlab/Python scripting
• MANATEE can be used as a standalone electromagnetic design software of electrical machines
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2020 03 10 manatee presentation en

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