3.8 Proceedings Paper

An Improved Conformal Mapping Aided Field Reconstruction Method for Modeling of Interior Permanent Magnet Synchronous Machines

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IEEE

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conformal mapping; field reconstruction method; slotting effect; equivalent complex permeability

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An improved field reconstruction method (IFRM) to model interior permanent magnet synchronous machine (IPMSM) is proposed to reduce computation time. In modeling IPMSM with conventional FRM, in order to include slotting effect, the basis function at various rotor positions has to be obtained and stored which increases the workload. The saturation and slotting effect can be avoided by employing conformal mapping (CM) method which maps the slotted stator into a slotless structure. As a result, only one set of basis functions at one rotor position would be necessary. The slotting effect is modeled as equivalent permeability which includes the information of rotor position. Hence, the field density distribution in the slotted structure is the product of the flux density distribution of slotless structure and the equivalent permeability. FEA simulation is conducted to evaluate the results from improved FRM and to validate the effectiveness of the IFRM.

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