考虑定子轴向偏移的YASA轴向磁通电机解析方法

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DOI：10.15938/j. emc.2025.04.007

中图分类号：TM315 文献标志码：A 文章编号：1007-449X（2025）04-0065-08

Analytical method of YASA axial flux machine considering axial stator offset

SHU Xindong1，²，YI Feng¹，²，Z ZHANG Hui1，2 ， ZHANG Chi 1，2 CHEN Silu1，²， CHEN Jinhua1，2

（1.Ningbo Instituteof Materials Technologyand Engineering，Chinese Academyof Sciences，Ningbo 315201，China; . KeyLaboratoryofRoboticsand Inteligent Manufacturing EquipmentTechnologyof ZhejangProvince，Ningbo315201，China）

Abstract ：In yokeless and segmented armature （YASA） axial flux permanent magnet machines，the stator may be axially shifted due to the manufacture and assembly，leading to vibration noise of the machine. An analytical method considering the axial stator ofset was proposed to calculate the no-load magnetic field air gap for the YASA machine. The YASA machine was transformed into a series of 2-D models with varying radii by employing a quasi-3-D approach. Subsequently， the accurate subdomain method was used to divide the YASA machine into five subdomains in Cartesian coordinates，which can effectively consider the effects of stator axial offset and stator slot depth on the air-gap magnetic field distribution.

Harmonic coefficients of each subdomain are solved based on boundary conditions，yielding the distribution of no-load air gap magnetic flux density，back electromotive force （back-EMF），and cogging torque. The calculation results were compared with finite element analysis（FEA），which shows a good agreement between the analytical method and FEA.Furthermore，it can be concluded that the variation of back-EMF and cogging torque can be almost neglected when the axial stator offset is less than 25% . Finally，the YASA machine was fabricated and experiments were carried out to further validate efectiveness of the proposed analytical method.

Keywords：axial flux permanent magnet machine; analytical model; offset; yokeless and segmented armature

0引言

轴向磁通永磁电机具有高转矩密度、高效率和结构紧凑等优点，广泛应用于电动汽车、风力发电和飞轮储能等场合[1-2]。（剩余8993字）