EOMYS | Joins the SIMULIA Brand of Dassault Systèmes

💡 Calculations of magnetic noise & vibrations can be easily performed on the whole torque speed plane with Manatee, allowing to capture e-NVH metrics at partial load. 🚀 In this example, 20 different load levels & 200 speed steps have been calculated (so 4000 e-NVH calculations) in only 25 min on a standard laptop, combining 2.5D magnetic FEA excitation forces with a 3D FEA mechanical model of the whole electric drive unit (stator, rotor, housing, gearbox...). 🤩 All visualization tools of Manatee are then accessible for the different load levels, in particular Order Tracking Analysis, spectrograms and Operational Deflection Shape analysis.

🤓 Are you interested in learning more about electromagnetic noise and vibrations ? ➡️ We have started to move all e-NVH learning contents from EOMYS websites to SIMULIA Community https://buff.ly/3U1D0T2 💡 Please be aware that you should create your free account before being able to access the content https://buff.ly/3TlTllj #eNVH #weare3ds

💡 Did you know that many #eNVH mitigation techniques have no impact on the electric drive structural dynamics ? ➡️ Rotor or stator notching (the change of mass is negligible, and removing material at bore radius does not affect the lamination stiffness) ➡️ Stator slot opening (change of mass & stiffness of stator teeth is negligible) ➡️ Skewing angle (varying the skew angle does not change important rotor modes for e-NVH, like bending and torsional modes) ➡️ Pole shape, flux concentration radius, V-shape angle (again global rotor modes are unchanged when varying these parameters) ➡️ Harmonic Current Injection ➡️ Switching frequency and strategy ➡️ Current angle (all techniques focusing on control do not alter mode shapes) 🤩 Contrary to a general purpose FEA suite, #Manateesoftware automatically identifies that these changes do not change the modal basis, so structural characterization under magnetic loads is only carried once. This results in much faster parameter sweeps or optimizations !

❓ Did you know that several efficient #eNVH control techniques proposed in Manatee software do not call into question the initial electromagnetic design ? 💡 Several magnetic noise mitigation technique are based on slight modification of the magnetic circuit geometry (e.g. stator/rotor notching, pole shaping, slot opening optimization). These modification do not significantly change torque, losses or mechanical stress. 👉 First example: Notching of rotor IPMSM can be done along D-axis, which does not require to update mechanical stress analysis. By experience, adding surface grooves on rotor surface does not significantly affect iron losses. 👉 Second example: Geometry optimization of the magnetic circuit is generally done using a current-driven simulation workflow in Manatee, using the currents coming from MTPA (Maximum Torque Per Amp) on the reference design. ⚠️ Once a modified geometry has been found fulfilling e-NVH metrics, it may lower the torque of a few %. The good news is that updating the MTPA currents on this new geometry to achieve reference torque does not alter e-NVH metrics as illustrated in this graph obtained on a notched stator. Stator notching was first optimized at 7115 RPM using MTPA currents of the stator without notches, and 7 dB reduction was obtained. Updating MTPA currents on the notched design still give 7 dB reduction !

Manatee #eNVH simulation can be run using different mechanical models, from e-motor basic design stage to system level detailed design phase: 👉 stator 2.5 D structural model (in free free boundary conditions): they can be used by electrical engineers when they don't have access yet to the mechanical model of the integrated drivetrain. In that case all structural models are built by Manatee. 👉 stator 3D structural model (with more complex boundary conditions): they can be used by electrical engineers to refine NVH calculations at the electrical machine level, when they don't have access yet to the mechanical model of the integrated drivetrain. In that case Manatee imports the modal basis from a third party 3D FEA mechanical software 👉 stator+rotor 3D structural model (may include bearings): they can be used by electrical or NVH engineers to refine NVH calculations at the electrical machine level including rotor/stator coupled modes, when they don't have access yet to the mechanical model of the integrated drivetrain. In that case Manatee imports the modal basis from a third party 3D FEA mechanical software. 👉 Electric Drive Unit 3D structural model (may include gears besides electric machine and housing): they can be used by mechanical & NVH engineers to have the most accurate NVH calculations at system level including airborne and structure borne noise, or faults such as eccentricities. In that case Manatee imports the modal basis from a third party 3D FEA mechanical software.

👉#Manateesoftware comes with simulation workflows that separate the effect of each electromagnetic Load Case, something that cannot be done in a general purpose FEA suite. 👉 An electromagnetic load case is defined by a circumferential wavenumber (r=0 in this illustration), a direction of application (radial & circumferential in this illustration), and a system of application (stator and rotor in this illustration). 💡This separation allows a better understanding of NVH generation process. In particular, "inner borne" noise due to driveline excitation by torque ripple can be differentiated from "outer noise" noise due to stator excitation by radial ripple.

🤩 Did you know that Manatee order tracking plot can be visualized both as a function of speed and frequency ? 💡 Frequency axis allows to align all resonances at same frequency and identify the modes involved in noise / vibration generation. Here, 20 most important modes for #eNVH (out of the 300 modes of the electric drive modal basis) are automatically identified by Manatee and displayed. 👉 In this example, Manatee shows that radial pulsating forces applied on stator teeth at H48 (48 times mechanical frequency) resonate with mode n°139 at 7463 RPM.

💡 Flux lines distribution is distorted by the load, producing a magnetic asymmetry over one pole. This means that magnetic circuit design optimization under load might results in asymmetrical geometries. 👉 When optimizing notch distribution and shape, one obtains symmetrical notches with respect to D-axis when considering only open circuit operation of PM machines. 👉 On the contrary, design optimization under load can lead in asymmetrical notch distribution. This is what happens when performing #eNVH optimization with #Manateesoftware. All these configurations can be modeled in Manatee software - it is even possible to make different North and South poles !

⏱️D-1 for our SIMULIA Manatee webinar - register today! 👉Jean Le Besnerais, PhD will guide you through this presentation on the latest developments regarding Manatee software on September 18, 5-6 pm CEST. #WeAre3DS #Manateesoftware #envh

📣 Jean Le Besnerais, PhD will present Manatee software in a SIMULIA Tech Talk on September 18th. 🎯 In this session, a live demo of Manatee on an automotive Electric Drive Unit with a 48-slot 8-pole Interior Permanent Magnet Synchronous Machine will be shown. 🔥 The planned highlights of the presentation are:  ●  Learn more about the physics of electromagnetic Noise Vibration Harshness (e-NVH)  ●  How to assess e-NVH metrics using Manatee software in early design and detailed design phases  ●  How to couple Manatee with other Simulia software for electric drive NVH  ●  How to speed up electric drive development by collaborating with Manatee software 👉 Access to the webinar is free, so don't wait and register now https://lnkd.in/eJnuAhnv We are also presenting Manatee materials in our SIMULIA User Community, whose access is free, but first, you have to create your 3DS Passport account here https://lnkd.in/ew2vJhvt #manateesoftware #envh #weare3ds