Abstract

Even though electric machines are electromechanical 3D devices, one typically analyses them in 2D due to prohibitively long simulation times for 3D transient finite element analysis (FEA). However, some important aspects of the machine are neglected when performing simulations in 2D, per example the parasitic resistance and inductance of the winding overhang or the impact of segmenting the magnets in a permanent magnet synchronous machine (PMSM) on eddy current losses. 

This tech talk will show how to enrich the predictive power of 2D FEA of radial flux machines in a manageable way by i) extracting the parasitic effects from a small set of simplified 3D FEA and ii) incorporating them properly into 2D FEA. Additionally, the error made by not properly accounting for these parasitic 3D effects will be quantified using a typical interior permanent magnet synchronous machine (IPMSM) for vehicle traction application. 

Highlights: 

• Integrated FE based electric machine workflows
• Extraction of winding overhang parasitic leveraging 3D FEA
• Skewed rotor and effective conductivity of segmented permanent magnets in 2D FEA

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