Investigation of Interior Permanent Magnet Machines with Concentrated Windings for High Dynamics Applications
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- Institutt for elkraftteknikk 
Interior permanent magnet (IPM) machines and non-overlapping concentrated windings (CW) are two design philosophies that have grown in popularity over the last decade. This is due to the many benefits and flexibility they provide. The combination of these philosophies and the tradeoffs involved, however, have not yet been fully discovered. The hope is that the performance enhancing properties of the IPM can be combined with the manufacturability of the CW.An investigation of these two philosophies have been done, focusing on torque performances and magnet losses caused by eddy currents. In order to do the investigation the finite element method (FEM) analysis software, COMSOL Multiphysics have been used. Two IPM models have been compared to a surface mounted permanent magnet (SPM) machine using the same stator design and winding philosophies.The IPM machines showed capability of reaching approxi- mately the same average torque as the SPM machine, although performing poorly when considering torque ripple performance. Considering magnet losses, the IPM machines showed little tendency to reduce the full-load magnet losses. No-load losses, however, was drastically reduced in the IPM models compared to the SPM model. The effect of magnet segmentation on magnet losses was also demonstrated.