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空间谐波对对称六相与三相PMSM串联系统的影响 被引量:7
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作者 刘陵顺 闫红广 +1 位作者 韩浩鹏 赵国荣 《西南交通大学学报》 EI CSCD 北大核心 2017年第2期348-354,共7页
单逆变器驱动的对称六相永磁同步电机(PMSM)串联三相PMSM解耦运行的理论基础是电机的反电动势必须为正弦波分布.为了研究电机中的非正弦空间谐波对串联系统解耦控制的影响规律,分别建立了对称六相PMSM含有2次和4次空间谐波的串联系统在... 单逆变器驱动的对称六相永磁同步电机(PMSM)串联三相PMSM解耦运行的理论基础是电机的反电动势必须为正弦波分布.为了研究电机中的非正弦空间谐波对串联系统解耦控制的影响规律,分别建立了对称六相PMSM含有2次和4次空间谐波的串联系统在3种不同坐标系下的数学模型,推导了非正弦空间谐波引起的六相PMSM电磁转矩脉动表达式,揭示了空间谐波对串联系统解耦运行影响的本质,并对两台电机变速、变负载等不同工况进行了仿真研究.结果表明,对称六相PMSM的2次和4次空间谐波导致其电磁转矩的脉动变化,无法实现对称六相串联三相PMSM系统的独立控制,需要进行相应的补偿控制. 展开更多
关键词 对称六相PMSM 三相PMSM 串联系统 空间谐波分析 数学模型 转矩脉动
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Commuting dual Toeplitz operators on the harmonic Bergman space 被引量:5
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作者 YANG JingYu LU YuFeng 《Science China Mathematics》 SCIE CSCD 2015年第7期1461-1472,共12页
We completely characterize commuting dual Toeplitz operators with bounded harmonic symbols on the harmonic Bergman space of the unit disk. We show that for harmonic ■ and ψ, S■Sψ= SψS■ on(L2h)⊥if and only if ■... We completely characterize commuting dual Toeplitz operators with bounded harmonic symbols on the harmonic Bergman space of the unit disk. We show that for harmonic ■ and ψ, S■Sψ= SψS■ on(L2h)⊥if and only if ■ and ψ satisfy one of the following conditions:(1) Both ■ and ψ are analytic on D.(2) Both ■ and ψ are anti-analytic on D.(3) There exist complex constants α and β, not both 0, such that ■ = αψ + β.Furthermore, we give the necessary and sufficient conditions for S■Sψ= S■ψ. 展开更多
关键词 dual Toeplitz operator harmonic Bergman space Bergmau space
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Weak Orlicz spaces:Some basic properties and their applications to harmonic analysis 被引量:8
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作者 LIU PeiDe WANG MaoFa 《Science China Mathematics》 SCIE 2013年第4期789-802,共14页
We study some basic properties of weak Orlicz spaces and their applications to harmonic analysis.We first discuss the absolute continuity of the quasi-norm and its normality,then prove the boundedness of several maxim... We study some basic properties of weak Orlicz spaces and their applications to harmonic analysis.We first discuss the absolute continuity of the quasi-norm and its normality,then prove the boundedness of several maximal operators.We also establish a kind of Marcinkiewicz-type interpolation theorem between weak Orlicz spaces.As applications,the weak type analogues of several classical inequalities in harmonic analysis is obtained. 展开更多
关键词 weak Orlicz space NORMALITY maximal operator interpolation theorem singular integral operator
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