高速高功率密度无轴承永磁薄片电机设计与优化  

Design and optimization of bearingless permanent magnet slicemotors for high speed and high power density applications

作　　者：李健 陈红[1] 李大伟 裴同豪 刘嘉韵 LI Jian;CHEN Hong;LI Dawei;PEI Tonghao;LIU Jiayun(College of Electrical Engineering and Automation,Shandong University of Science and Technology,Qingdao 266590,China;School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]山东科技大学电气与自动化工程学院,山东青岛266590 [2]华中科技大学电气与电子工程学院,湖北武汉430074

出　　处：《电机与控制学报》2024年第6期171-180,共10页Electric Machines and Control

基　　金：山东省自然科学基金(ZR2020QE218)。

摘　　要：传统无轴承电机在高速和高功率密度之间难以取得平衡,为此围绕高速高功率密度无轴承永磁薄片电机,对其拓扑结构、绕组形式、主要尺寸等方面进行优化设计,在保证转速和功率密度的基础上有效地提升悬浮性能。通过对运行工况的分析,得出电机拓扑结构需具备的基本特点,提出一种采用环形集成绕组的表贴式无轴承永磁薄片电机。在兼顾转矩和悬浮力输出性能、机械防护可靠性的基础上,对电机的电磁气隙长度和永磁体参数等主要尺寸进行优化设计。针对电机饱和、绕组端部伸出等不利因素,分别采取了超前角弱磁、定子略长的性能提升策略,有效地避免了悬浮力的大幅度跌落。搭建20 000 r/min的无轴承永磁薄片电机有限元仿真模型并制造实物样机。通过对电磁转矩和主、被动悬浮力的分析,证明了本文设计的无轴承永磁薄片电机兼具良好的转矩与悬浮力输出性能,单位幅值电流产生的电磁转矩、主动悬浮力分别为0.166 N·m、4.4 N,电机输出功率10 kW、功率密度5.2 kW/kg。Focusing on the design of bearingless permanent magnet slice motors for high speed and high power density applications,the topology,winding structure,main dimensions,control method and process scheme were optimized.Through the analysis of working conditions,the features of the topology can be concluded.As a result,a surface-mounted type bearingless permanent magnet slice motor with dual-three phase toroidal combined windings was proposed.Taking both the torque and suspension force into consideration,the ratio of the internal and external diameter,the length of magnetic gap and the parameters of the permanent magnets were optimized.Besides,to avoid the decrease of suspension force due to saturation and end-winding effect,the control method leading-angle field-weakening was adopted as well as making the stator slightly longer than the rotor.The finite element analysis model and the experimental prototype were set up to evaluate the torque and suspension force performance.It is proved that the proposed model is able to produce the needed torque and suspension force with good performance.

关 键 词：无轴承永磁薄片电机 高速高功率密度 环形绕组 优化设计 弱磁控制 端部效应 

分 类 号：TM32[电气工程—电机]