摘要
以一台20槽22极的五相分数槽集中绕组表贴式永磁电机为例进行分析。在保持电流有效值不变的前提下,以获得最大平均转矩为目标,采用解析法确定谐波电流分量,并通过有限元法得到验证。此外,对比分析电机在谐波电流注入前后电磁转矩、绕组磁动势、气隙磁密、涡流损耗、径向力波等性能的变化。分析表明,注入谐波电流后电机绕组磁动势出现新的谐波分量(包括低次分量),并导致涡流损耗和最低次径向力波含量增加。分析结果揭示了多相永磁电机设计的重点,为该类电机的设计提供参考。
A five-phase 20-slot 22-pole fractional-slot concentrated winding multiphase surface-mounted permanent magnet machine is exemplified to study the influence of the injected harmonic currents. The optimal harmonic current component is analytically derived to achieve the maximum average torque while the effective values of the phase currents are kept unchanged. The analytical current is verified by finite element analysis. Further,comparisons of electromagnetic torque, magneto-motive force, air-gap flux density, eddy current loss, and radial force density between the machines with and without harmonic current injection are respectively carried out. The results show that new space harmonics including the ones with lower orders appear due to the injected harmonic current,which leads to the increases of the eddy current loss and the lowest order radial force. The results demonstrate the key points and guidance for the multiphase permanent magnet machine design.
出处
《电工技术学报》
EI
CSCD
北大核心
2015年第9期22-29,共8页
Transactions of China Electrotechnical Society
基金
国家自然科学基金面上项目(51177056)
国家自然科学基金青年科学基金(51307067)资助项目
关键词
多相永磁电机
谐波电流
电磁性能
影响
Multiphase permanent magnet machine,harmonic current,electromagnetic performance,impact
