Subjects: Dynamic and Electric Engineering >> Electrical Engineering submitted time 2019-03-05 Cooperative journals: 《电气工程学报》
Abstract：不均匀气隙结构的异步起动永磁体同步电机是针对普通异步起动永磁同步 电机由于气隙磁场谐波复杂而导致的运行过程中转矩脉动大、电磁噪声高等问题提出 的，此结构电机的永磁体退磁情况与普通电机有较大不同。本文基于永磁体内各处的 磁场矢量基本相同的原则，利用永磁体内部一点的磁密表征整个永磁体在运行过程中 磁密的变化，对不均匀气隙结构异步起动永磁体同步电机永磁体工作点展开了理论研 究与有限元仿真。分析了影响电机退磁的因素，研究了施加不同负载与转动惯量时永 磁体的磁密变化情况，得到电机稳态运行时和起动过程中永磁体工作点的变化规律， 提出了获得永磁体磁密最小工作点的研究方法。
Subjects: Dynamic and Electric Engineering >> Electrical Engineering submitted time 2019-03-05 Cooperative journals: 《电气工程学报》
Abstract：针对永磁电机的齿槽转矩影响其控制精度和性能的问题，本文提出削角可 以有效抑制齿槽转矩的方案。以一台 30 槽 10 极永磁电机为例，利用数值仿真原理， 建立电机电磁场有限元模型，对削角削弱齿槽转矩的方法进行仿真分析。研究表明， 齿槽转矩的大小与削角高度和削角宽度有关，选取合适的削角高度和宽度可以有效地 削弱齿槽转矩。仿真结果证明了本文基于削角的齿槽转矩削弱方法的有效性和正确性。
Subjects: Dynamic and Electric Engineering >> Electrical Engineering submitted time 2019-03-05 Cooperative journals: 《电气工程学报》
Abstract：超导托克马克聚变实验装置（EAST）的极向场超导线圈发生失超时，超导 线圈电阻变化引起的微弱电压信号变化被强噪声淹没。针对该问题，运用快速傅里叶 变化分析线圈电压信号的时频特性。根据分析结果，提出运用经验模态分解（EMD） 方法对超导线圈两端电压信号进行分析，得到若干固有模态分量和余项，并得知微弱 信号的能量主要分布在余项中。该方法能够消除环境影响，检测出电压信号的微弱变 化。
Subjects: Dynamic and Electric Engineering >> Electrical Engineering submitted time 2019-03-05 Cooperative journals: 《电气工程学报》
Abstract：不均匀气隙结构的异步起动永磁体同步电机是针对普通异步起动永磁同步 电机由于气隙磁场谐波复杂而导致的运行过程中转矩脉动大、电磁噪声高等问题提出 的，此结构电机的永磁体退磁情况与普通电机有较大不同。本文基于永磁体内各处的 磁场矢量基本相同的原则，利用永磁体内部一点的磁密表征整个永磁体在运行过程中 磁密的变化，对不均匀气隙结构异步起动永磁体同步电机永磁体工作点展开了理论研 究与有限元仿真。分析了影响电机退磁的因素，研究了施加不同负载与转动惯量时永 磁体的磁密变化情况，得到电机稳态运行时和起动过程中永磁体工作点的变化规律， 提出了获得永磁体磁密最小工作点的研究方法。
Subjects: Dynamic and Electric Engineering >> Electrical Engineering submitted time 2019-03-05 Cooperative journals: 《电气工程学报》
Abstract：改变槽形结构作为一种简单易实施的方法被广泛地应用在电机的各项性能 优化中。本文探讨了一种以降低电机附加损耗为目的的转子槽形的优化设计，首先分 析了转子槽各个尺寸与附加损耗间的变化关系，并对其进行函数拟合得到对应于附加 损耗最小值的一组尺寸，再根据电机设计的其他要求对尺寸变量进行迭代调整得到最 佳的槽形参数。该研究可以为电机的优化设计提供参考思路。
Subjects: Mechanical Engineering >> Other Disciplines of Mechanical Engineering submitted time 2018-06-15 Cooperative journals: 《电气工程学报》
Abstract： In experimental advanced superconducting Tokamak (EAST) device, during the quench process of a superconducting coil, the voltage variation caused by change in coil resistance is so small that is submersed in the background noise. To solve the problem, the time-frequency characteristic of the coil voltage signals is analyzed by Fourier decomposition, then the coil voltage signals is decomposed into several intrinsic mode functions (IMF) and the remainder by empirical mode decomposition (EMD). The result shows that the energy of weak signal is distributed mainly in the remainder and the weak variation can be extracted from the noise by EMD.
Subjects: Mechanical Engineering >> Other Disciplines of Mechanical Engineering submitted time 2018-06-15 Cooperative journals: 《电气工程学报》
Abstract： Line-start permanent magnet synchronous motor (LSPMSM) with nonuniform air gap structure is proposed for reducing torque ripple, high electromagnetic noise caused by the complex harmonic distortion rate of air gap magnetic field of common LSPMSM. The demagnetization condition of the permanent magnet of the structure is different from that of the ordinary motor. In this paper, based on the principle that magnetic field vector in permanent magnet is almost the same, the magnetic flux density of the permanent magnet is characterized by the magnetic density of inner point of the magnet. Theoretical study and finite element simulation of line-start permanent magnet synchronous motor with non-uniform air gap structure are carried out. This article has analyzed the influence factors of the motor demagnetization, and relationship between load characteristic and demagnetization of permanent magnet has also been studied. In this paper, the variation law of permanent magnet working point during steady state operation and starting process is obtained, and research method of obtaining the minimum working point of permanent magnet is proposed.
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