MANATEE software

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MANATEE V2 Graphical User Interface

Developed and distributed by EOMYS, MANATEE (Magnetic Acoustic Noise Analysis Tool for Electrical Engineering) is the only simulation software dedicated to the vibro-acoustic design optimization of electrical machines under electromagnetic excitations (also called e-NVH in automotive applications, e.g. EV HEV NVH).

The advantages of MANATEEĀ® compared to multiphysic numerical software suites can be summarized as following:

  1. pre-defined multiphysic couplings (no need to define how to couple electromagnetics, structural mechanics and acoustics) to shorten simulation set-up
  2. different levels of modelling for use during both early design phase (NVH ranking of e-machines in a few seconds of calculation up to 20 kHz) and detailed vibroacoustic design (optimized coupling with structural & acoustic FEA)
  3. advanced NVH troubleshooting tools with more than 150 built-in graphical post processing
  4. direct implementation of main noise mitigation techniques (e.g. skewing, notching, pole shaping, current injection, RPWM) as well as faults and asymmetries (e.g. eccentricities, uneven airgap, pole displacement and demagnetization)
  5. numerous industrial validation cases including sound power level at variable speed, as well as several other validation cases including academic ones. MANATEE is regularly used in technical publications and is based on PYLEECAN open-source project
  6. no parasitic harmonics due to remeshing, magnetic force interpolation or field projection - all harmonics can be filtered based on analytic equations

Based on powerful calculation algorithms such as Electromagnetic Vibration Synthesis and Load Extrapolation Algorithm, acoustic noise and vibrations due to Maxwell forces can be quickly and accurately calculated both in basic design and detailed design phase at all the operating points of the e-machine.

A unique combination of electrical engineering and vibro-acoustic know-how allows to understand the root cause of Noise Vibration Harshness, and implement several acoustic noise mitigation techniques during the electromagnetic and structural design of electric motors. MANATEE can be used after manufacturing as a fault diagnosis tool of noisy electrical machines.

MANATEE NVH simulation workflow
MANATEE NVH simulation workflow

These features make MANATEE a must-have tool for electrical machine designers who need to include the NVH criterion at design stage, but also an electromagnetic design software that is more open and flexible compared to other software solutions. Automated coupling of MANATEE with FEMM allows efficient hybridation of numerical and semi-analytical magnetic models for the fast and accurate assessment of electromagnetic excitations.

MANATEE also includes optimization and parameter sweep modules to help finding the optimal trade-off between electromagnetic and vibro-acoustic performances of an electrical machine, avoiding extra costs (e.g. change of rotor, rewinding of stator, use of acoustic insulation or vibration dampers) when sound or vibration level is unexpectedly high after manufacturing.

MANATEE unique algorithms gives the acoustic pressure and power level up to 20 kHz at variable speed within a few seconds of calculation:

Variable speed sound pressure level spectrum
Variable speed sound pressure level spectrum

Contrary to a finite-element-based multiphysic simulation chain, MANATEE can be used during early electromagnetic design optimization loops (e.g. optimization of the slot and pole number combination, optimization of the magnet shape), and captures the electric motor NVH behaviour over the full operational range (noise maps) within a reasonable time. Electromagnetic, structural and acoustic models are seamlessly coupled.

MANATEE software new version V2 (release planned for early 2021) is being developed under Python, with a powerful Object-Oriented Programming approach. Compared to previous versions, MANATEE V2 does not require the use of Matlab. A more user-friendly graphical user interface is also proposed. e-NVH customer consulting support - more than simple IT support, as it can be used to obtain advices on the vibroacoustic design of electric motors or for customized software development - is still included in all our leasing offers.

A general presentation of MANATEE software is available here:

PDF - 6.7 Mb

MANATEE includes more than 150 plot commands giving physical insights in simulation results (e.g. FFTs, operational deflection shape, order tracking, analytical harmonic expressions). They are accessible in command line and are detailed in Plot commands part.

An online help is available as short questions and answers in the HowTos part. They cover all functionalities of MANATEE.

Some more advanced tutorials covering the full simulation process from electromagnetics to vibroacoustics on different machine topologies can be found in the Tutorials section.

All the electrical, electromagnetic, mechanical and acoustic validations of MANATEE can be found in the Validations part.

Licensing information can be found in part License.

For a quotation request, you can contact us through the contact form.

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