February 2016 : New Geometry, FEMM and website tutorial

MANATEE ongoing development

MANATEE (Magnetic Acoustic Noise Analysis Tool for Electrical Engineering) software logo

We are currently working on the v1.05.02 release to add some new features to MANATEE. There are the three main features introduced by this version :

Slot type 26 and 52

Answering to some of our client needs, we have created new slots according to these schematics :

Slot 26 schematics
Slot 26 schematics
Slot type 52 schematics
Slot type 52 schematics

Note that if you need a new topology for your machine or a new feature for your project, you can send your request by our contact page.

Buried Magnet

Another significant improvement on v1.05.02 will be the way buried magnet are handled. We have completely changed the way we manipulate them internally to gain in flexibility (nothing will change for the user since the input code remains the same).
Thanks to these changes, it will be possible to combine several buried magnet slots to create more complex topology such as :

Complex Buried Magnet Topology
Complex Buried Magnet Topology
Permeance computation with FEMM

The automated coupling of MANATEE software with FEMM has been used to introduce the possibility to calculate the airgap permeance function using finite element method. The interest is that the permeance / magnetomotive force model used for the airgap flux density calculation can now include more complex effects such as magnetic wedges and saturation. Magnetic wedges have a strong influence on the harmonic content of the airgap flux density, and therefore on Maxwell stress harmonics, and resulting magnetic vibrations and acoustic noise.

Permeance computation with FEMM
Permeance computation with FEMM

Zoom on MANATEE feature

MANATEE is fully automated to FEMM free software, a 2D non-linear magnetostatic finite element model. This coupling was initially developped by EOMYS to automatically compare the fast subdomain model techniques of MANATEE to finite element (see validation cases). The electromagnetic quantities can be both calculated with subdomain or permeance/mmf model and with FEMM using Input.Simu.type_Bmodel options. To make the difference between these different model outputs, the FEMM variables are noted with _fem subscript (e.g. Output.Magnetics.XBr_fem gives the radial flux density distribution in the machine obtained with FEMM).

This means that once a machine is defined within MANATEE, the corresponding model can be automatically built in FEMM including geometry, physics and boundary conditions. This coupling includes the following features:

  • automated definition of geometry, mesh, solver and post processing
  • handling of symmetries and arbitrary rotor to stator rotation
  • handling of any winding type through user-defined winding matrix
  • calculation of torque, flux density, inductances, and airgap permeance
    Electrical machines automatically defined in FEMM by MANATEE
    Electrical machines automatically defined in FEMM by MANATEE

New features of the website

EOMYS website has been updated with a new tutorial section. For now this section is the latest version of MANATEE Squirrel Cage Induction Machine tutorial. We are currently working on new tutorials to complete this section. The next one will be on "Electromagnetic and vibro-acoustic simulation of Surface Permanent Magnet Synchronous Machine".

There are now two types of tutorial on the website :

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