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- W3135676543 abstract "An improved winding function theory (IWFT) is presented in this article, which can be also used to calculate the self-inductance and mutual inductance of large air-gap electric machines, while accurately considering the air-gap length function and the magnetic saturation in iron parts, simultaneously. In IWFT, the radial length of flux path in different points inside air gap is calculated using the conformal mappings (CMs). The total air-gap length is the resultant of air-gap length at differential elements in the radial direction. A modified inverse air-gap function is then presented for a typical cage-rotor induction motor (CRIM) and a typical surface permanent magnet synchronous motor (SPMSM), which considers the real paths of flux lines in the slotted air gap. The high accuracy of these modified inverse air-gap functions is verified by comparing with the corresponding results obtained through the finite element method (FEM). To consider the magnetic saturation, a virtual winding function as a 2-D function is introduced in this article, which can consider the magneto-motive force (MMF) drops in iron parts of stator and rotor obtained through the magnetic equivalent circuit (MEC) model. By using IWFT, dependent on the structure of the relevant motor, a 2-D or 3-D lookup table is pre-calculated and stored for self/mutual inductances and their derivatives, and they are then used to model the running condition of CRIM and SPMSM under different loading conditions. Finally, the accuracy of IWFT results is verified by comparing them with the corresponding results obtained through FEM." @default.
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- W3135676543 date "2021-05-01" @default.
- W3135676543 modified "2023-10-11" @default.
- W3135676543 title "An Improved Winding Function Theory for Accurate Modeling of Small and Large Air-Gap Electric Machines" @default.
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- W3135676543 doi "https://doi.org/10.1109/tmag.2021.3064402" @default.
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