无铁心轴向磁场永磁同步发电机(AFPMSG)以其特殊的结构形式、优异的性能表现成为近年来广泛研究的电机拓扑结构之一。文中简述了无铁心AFPMSG的结构及原理,分析了电机电磁设计要点,设计了1 k W轴向磁场永磁同步发电机,利用电磁场有限元...无铁心轴向磁场永磁同步发电机(AFPMSG)以其特殊的结构形式、优异的性能表现成为近年来广泛研究的电机拓扑结构之一。文中简述了无铁心AFPMSG的结构及原理,分析了电机电磁设计要点,设计了1 k W轴向磁场永磁同步发电机,利用电磁场有限元分析软件Ansoft建立电机模型并仿真分析,研究了电机在空载和负载条件下的输出性能,验证了电机设计的合理性。研究结果表明:无铁心AFPMSG具有更好的电磁性能输出,电枢反应较小,低速运行平稳,同时具有较小的电磁转矩,适合低速应用场合。展开更多
In this paper, with the non-salient pole permanent magnet linear synchronous motor (PMLSM)being cited, by using Fourier transform method and "slot-by-slot", "pole -by-pole" current approach, a 3D e...In this paper, with the non-salient pole permanent magnet linear synchronous motor (PMLSM)being cited, by using Fourier transform method and "slot-by-slot", "pole -by-pole" current approach, a 3D electromagnetic field model of PMLSM is established. Special attention is paid to its structure and the influence of longitudinal and transverse end effect. The distribution of electromagnetic field of PMLSM can be obtained directly and promptly by using FFT algorithm. It can also be used for the analysis of other LSM.展开更多
The rapid change in the Earth’s magnetosphere caused by solar wind disturbances has been an important part of the solar wind-magnetosphere interaction.However most of the previous studies focused on the perturbation ...The rapid change in the Earth’s magnetosphere caused by solar wind disturbances has been an important part of the solar wind-magnetosphere interaction.However most of the previous studies focused on the perturbation of the Earth’s magnetic field caused by solar wind dynamic pressure changes.In this paper,we studied the response of geosynchronous magnetic field and the magnetic field to the rapid southward turning of interplanetary magnetic field during the interval 1350 1420 UT on 7May 2007.During this event,BZ component of the interplanetary magnetic field decreased from 15 nT to 10 nT within 3 min(1403 1406 UT).The geosynchronous magnetic field measured by three geosynchronous satellites(GOES 10 12)first increased and then decreased.The variations of magnetic field strength in the morning sector(9 10 LT)were much larger than those in the dawn sector(5 LT).Meanwhile,the H components of geomagnetic field on the ground have similar response features but exhibit latitude and LT dependent variations.Compared with H components,the D components do not have regular variations.Although the solar wind dynamical pressure encounters small variations,the magnetic field both in space and on the ground does not display similar variations.Therefore,the increase of geomagnetic field in the dawn sector is caused by the southward turning of IMF(interplanetary magnetic field)BZ.These results will help to better understand the coupling process of geomagnetic filed and interplanetary magnetic field.展开更多
文摘无铁心轴向磁场永磁同步发电机(AFPMSG)以其特殊的结构形式、优异的性能表现成为近年来广泛研究的电机拓扑结构之一。文中简述了无铁心AFPMSG的结构及原理,分析了电机电磁设计要点,设计了1 k W轴向磁场永磁同步发电机,利用电磁场有限元分析软件Ansoft建立电机模型并仿真分析,研究了电机在空载和负载条件下的输出性能,验证了电机设计的合理性。研究结果表明:无铁心AFPMSG具有更好的电磁性能输出,电枢反应较小,低速运行平稳,同时具有较小的电磁转矩,适合低速应用场合。
文摘In this paper, with the non-salient pole permanent magnet linear synchronous motor (PMLSM)being cited, by using Fourier transform method and "slot-by-slot", "pole -by-pole" current approach, a 3D electromagnetic field model of PMLSM is established. Special attention is paid to its structure and the influence of longitudinal and transverse end effect. The distribution of electromagnetic field of PMLSM can be obtained directly and promptly by using FFT algorithm. It can also be used for the analysis of other LSM.
基金supported by the National Natural Science Foundation of China(Grant Nos.40931054 and 41174141)the National Basic Research Program of China("973" Program)(Grant No.2011CB811404)
文摘The rapid change in the Earth’s magnetosphere caused by solar wind disturbances has been an important part of the solar wind-magnetosphere interaction.However most of the previous studies focused on the perturbation of the Earth’s magnetic field caused by solar wind dynamic pressure changes.In this paper,we studied the response of geosynchronous magnetic field and the magnetic field to the rapid southward turning of interplanetary magnetic field during the interval 1350 1420 UT on 7May 2007.During this event,BZ component of the interplanetary magnetic field decreased from 15 nT to 10 nT within 3 min(1403 1406 UT).The geosynchronous magnetic field measured by three geosynchronous satellites(GOES 10 12)first increased and then decreased.The variations of magnetic field strength in the morning sector(9 10 LT)were much larger than those in the dawn sector(5 LT).Meanwhile,the H components of geomagnetic field on the ground have similar response features but exhibit latitude and LT dependent variations.Compared with H components,the D components do not have regular variations.Although the solar wind dynamical pressure encounters small variations,the magnetic field both in space and on the ground does not display similar variations.Therefore,the increase of geomagnetic field in the dawn sector is caused by the southward turning of IMF(interplanetary magnetic field)BZ.These results will help to better understand the coupling process of geomagnetic filed and interplanetary magnetic field.
