Thermal-Electromagnetic Analysis for Driving Cycles of Embedded Flux-Switching Permanent Magnet Motors
Résumé
This paper presents a fast and precise electromagnetic-thermal model of a redundant dual star Flux-Switching Permanent Magnet (FSPM) motor for the embedded applications with driving cycles, e.g. Hybrid Electrical Vehicle (HEV), aerospace, etc. This model is based on a prior steady characterization by Finite Element Method (FEM) 2D of the FSPM motor via calculating the instantaneous torque, the normal and tangential components of magnetic flux density (Br and ) of each element of stator as well as rotor for different RMS current densities and different rotor positions. These results are then used in the analytical copper and iron losses models for calculating the instantaneous copper and rotor as well as stator iron losses during one driving cycle. The Lumped Parameter (LP) and Finite Element 2D transient thermal models are then carried out, in which the previously obtained instantaneous power losses are used as heat sources for calculating the temperatures of different motor parts during driving cycles. In the thermal studies, a transformation of irregular slot structure into a regular (rectangular) one is applied to simplify the calculation of winding thermal resistance. The Thermal-Electromagnetic Analysis method in this paper can also be extended for all the other applications with driving cycles. The experimental tests are carried out to validate the analytical and numerical results.
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