Abstract
A 3-D analytical model of armature reaction field (ARF) of interior permanent magnet synchronous motor (IPMSM) with multi-segmented skewed poles (MSP) and multi-layered flat wire winding (MFWW) considering current harmonics is proposed in this paper. Firstly, based on the MFWW distribution analysis and the coil magnetic field vector superposition method, the ideal ARF functions of the MFWW considering low-order current harmonics and high-order sideband current harmonics are derived. Secondly, 3-D relative permeance functions caused by the stator slotting effect and the multi-segmented rotor magnetic barriers are presented. Thirdly, 3-D analytical expressions of ARF are obtained by multiplying the ideal ARF functions and the 3-D relative permeance functions. Additionally, the effects of low-order current harmonics, high order sideband current harmonics, MSP, and stator slotting on the spatial orders and frequencies of ARF are analyzed. Finally, the proposed model is verified by finite element method (FEM) and experiment.
Highlights
Currently, interior permanent magnet synchronous motor (IPMSM) has been widely equipped in electric vehicles, due to its several advantages compared with surface permanent magnet synchronous motor (SPMSM), such as high fluxweakening capability, high torque output owing to the reluctance torque, and robust structure because of permanent magnets embedded in the rotor [1]
The multi-segmented skewed poles (MSP) structure does not change the frequency characteristics and the spatial orders of armature reaction field (ARF), it leads to the variation of the relative permeance along the axial direction because of the position modification of the magnetic barriers of the rotor and further causes the axial distribution variation of ARF
2) The stator slotting and the magnetic barriers of the rotor respectively bring in new spatial orders μQs and 2kp of ARF
Summary
Interior permanent magnet synchronous motor (IPMSM) has been widely equipped in electric vehicles, due to its several advantages compared with surface permanent magnet synchronous motor (SPMSM), such as high fluxweakening capability, high torque output owing to the reluctance torque, and robust structure because of permanent magnets embedded in the rotor [1]. The major advantage of FEM is its ability to consider a complex rotor structure [11] and magnetic saturation It is time consuming [12]-[15], especially for 3-D models, which are required for IPMSM with MSP. The effects of the complex rotor structures and the magnetic saturation on the ARF of IPMSM can be considered by magnetic-equivalent-circuit method. 3-D relative permeance functions caused by the stator slotting effect and the multi-segmented rotor magnetic barriers are presented.
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