Electromagnetic modules (EM)

Several electromagnetic models are included in MANATEE, providing different trade-offs between accuracy and computation time:
- Analytical models (e.g. permeance / mmf model, also called Winding Function Model): low computation time / low accuracy
- Semi-analytical models (e.g. SubDomain Model): moderate computation time / high accuracy
- Numerical models (e.g. non-linear magnetostatics with FEMM): high computation time / high accuracy

The permeance / winding function model (WFM) has the advantage to take into account phase current time harmonics due to PWM within a very short computation time. Time harmonics can also be efficiently modeled in subdomain models (SDM) using field reconstruction methods. They can be included in finite element method (FEM) but it makes variable speed calculations much slower.

Another advantage of WFM is to take into account static and dynamic eccentricities, uneven airgap shape, short-circuits, demagnetization and pole displacements faults. All the models can account for stator and rotor skewing.

The electromagnetic models takes phase currents and permanent magnet sources as an input in order to calculate the airgap radial and tangential flux density distribution in time and space.

This module is split in the following sub-modules :
- Electromagnetic analytical module for squirrel cage induction machines (EM1.SCIM)
- Electromagnetic analytical module for surface permanent magnet synchronous machines (EM1.SPMSM)
- Electromagnetic semi-analytical module for squirrel cage induction machines (EM2.SCIM)
- Electromagnetic semi-analytical module for surface permanent magnet machines (EM2.SPMSM)
- Electromagnetic semi-analytical module for inset permanent magnet machines (EM2.IPMSM)
- Electromagnetic finite element (non linear magnetostatics) module for squirrel cage induction machines at no load (EM3.SCIM)
- Electromagnetic finite element (non linear magnetostatics) module for surface or inset permanent magnet synchronous machines at full load (EM3.PMSM)
- Electromagnetic finite element (non linear magnetostatics) module for doubly fed induction machines at full load (EM3.DFIM)

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