Axial-flux magnetic-geared machine(MGM) is a promising solution for electric vehicle applications for combining the virtues of both axial-flux electric machine and magnetic gear. However, generalized MGMs are limited ...Axial-flux magnetic-geared machine(MGM) is a promising solution for electric vehicle applications for combining the virtues of both axial-flux electric machine and magnetic gear. However, generalized MGMs are limited by the torque density issue, accordingly inapplicable to industrial applications. To solve the abovementioned issue, an improved axial-flux magnetic-geared machine with a dual-winding design is proposed. The key merit of the proposed design is to achieve enhanced torque performance and space utilization with the proposed design, which installs a set of auxiliary winding between modulation rings. With the proposed design, overload protection capability, and fault-tolerant capability can be also achieved, for the proposed machine can work with either the excitation of armature windings or auxiliary windings. The pole-pair, slot combination, and parametric design is studied and optimized by the 3d finite-element method and designed C++ optimization software. Electromagnetic analysis and performance comparison indicate that the proposed machine can achieve a torque enhancement of 68.6% compared to the comparison machine.展开更多
Better torque performance and higher reliability have long been the focus of research for slotted limited-angle torque motors(LATMs),which are primarily used to position first-stage valves in electrohydraulic servosys...Better torque performance and higher reliability have long been the focus of research for slotted limited-angle torque motors(LATMs),which are primarily used to position first-stage valves in electrohydraulic servosystems.This paper presents a high reliability axial-flux slotted LATM with quasi-Halbach array for torque performance improvement including constant torque range(CTR)and output torque.Firstly,the structure with two sets of windings and the operation principle of the proposed slotted LATM is analyzed.Secondly,a brief design procedure is presented,the structure selections of open slot and double-stator single-rotor(DSSR)interior rotor with surface mounted quasi-Halbach permanent magnet(PM)array are illustrated,and the geometric parameters are optimized to obtain the optimal design of the proposed slotted LATM.Then,3-D finite-element method(FEM)is employed to compare the proposed slotted LATM with the conventional surface mounted PM slotted LATM in terms of cogging torque,no-load back EMF,and output torque,and the results show that the proposed LATM with quasi-Halbach array has a 10%improvement in output torque and a 25%improvement in CTR.Meanwhile,the flux linkages and torque performance of the two sets of windings under various conditions verify good magnetic isolation.Finally,prototypes of two different rotor types are manufactured and a series of experiments are performed to validate the analysis.展开更多
With the cvolution of various high powerr-density machines, it beeomes important to optimize the power potential of machines of vastly different topologies with a variety of waveforms of back emf and current. The appr...With the cvolution of various high powerr-density machines, it beeomes important to optimize the power potential of machines of vastly different topologies with a variety of waveforms of back emf and current. The approach of tins paper is based oil the gencral-purpose sizing equations. which permit the optinlization method of machine power density to be applied to the axial-flux toroidal permanent-magnet (AFTPM) machine, and,furthermore, the power-production capabilities of the AFTPM machinc and the wen-known squirrel-cage indution machine are compared.展开更多
The static characteristics of an axial-flux permanentmagnet( AFPM) machine with coreless stator were investigated.Two-dimensional analytical method for prediction of the no-load magnetic field in the AFPM machine with...The static characteristics of an axial-flux permanentmagnet( AFPM) machine with coreless stator were investigated.Two-dimensional analytical method for prediction of the no-load magnetic field in the AFPM machine with coreless stator was derived. Electromotive force( EMF) and axial attraction force were deduced from the analytical method. These values obtained from analytical method were compared with those from finite element method( FEM) and agree well. Finally,a prototype was built for experimental validation and back EMF was measured. The results confirmed the validity of the proposed analytical method.展开更多
This paper deals with the design of high power – low dimensions axial-flux permanent-magnet motor intended for trac-tion application. First, two motor configurations are analytically designed and compared using finit...This paper deals with the design of high power – low dimensions axial-flux permanent-magnet motor intended for trac-tion application. First, two motor configurations are analytically designed and compared using finite element calcula-tion. Then, the configuration yielding the best performances is integrated and modelled with the whole traction chain under MATLAB/SIMULINK environment in order to demonstrate the motor operation on a large speed band.展开更多
定子槽漏感是定子无轭模块化(yokeless and segmented,YASA)轴向磁通永磁电机电感的主要分量,会降低电机的功率因数和最大输出转矩。该文提出定子槽内微小单元磁场能量法计算YASA电机的定子槽漏感,通过建立计及铁心饱和影响的二维等效...定子槽漏感是定子无轭模块化(yokeless and segmented,YASA)轴向磁通永磁电机电感的主要分量,会降低电机的功率因数和最大输出转矩。该文提出定子槽内微小单元磁场能量法计算YASA电机的定子槽漏感,通过建立计及铁心饱和影响的二维等效磁网络模型准确计算槽内微小单元储存的磁场能量,进而计算定子槽漏感。基于所提出的方法,进一步研究定子结构参数以及极槽配合对YASA电机定子槽漏感的影响规律。有限元仿真和实验结果表明,该文所提出的YASA电机定子槽漏感计算方法的可行性和准确性。展开更多
为了满足定子无磁轭分块电枢(yokeless and segmented armature,YASA)轴向磁通永磁电机作为车用牵引电机时对输出转矩高平稳性的要求,提出一种基于永磁体径向均匀分段、分组同向偏移的方法来抑制YASA电机的齿槽转矩,以降低转矩脉动。应...为了满足定子无磁轭分块电枢(yokeless and segmented armature,YASA)轴向磁通永磁电机作为车用牵引电机时对输出转矩高平稳性的要求,提出一种基于永磁体径向均匀分段、分组同向偏移的方法来抑制YASA电机的齿槽转矩,以降低转矩脉动。应用三维有限元分析,分别研究了3种不同的永磁体分段方案对齿槽转矩的削弱效果,确定了磁极的最优偏转角度及其对电机综合性能的影响。仿真结果验证了该方法的可行性。YASA电机的齿槽转矩降低了92.62%,额定工况下转矩脉动下降了72.02%,永磁体涡流损耗降低91.28%,同时输出转矩下降不超过5.34%,提高了YASA电机的综合性能。展开更多
基金supported by the National Natural Science Foundation of China (Grant No. 52277049)the Industry-university-research Cooperation Project in Fujian Province University and Enterprise (Grant No. 2022H6026)the National Key Research and Develop Plan,Special Project of “New Energy Vehicles”(Grant No. 2022YFB2502802-2-1)。
文摘Axial-flux magnetic-geared machine(MGM) is a promising solution for electric vehicle applications for combining the virtues of both axial-flux electric machine and magnetic gear. However, generalized MGMs are limited by the torque density issue, accordingly inapplicable to industrial applications. To solve the abovementioned issue, an improved axial-flux magnetic-geared machine with a dual-winding design is proposed. The key merit of the proposed design is to achieve enhanced torque performance and space utilization with the proposed design, which installs a set of auxiliary winding between modulation rings. With the proposed design, overload protection capability, and fault-tolerant capability can be also achieved, for the proposed machine can work with either the excitation of armature windings or auxiliary windings. The pole-pair, slot combination, and parametric design is studied and optimized by the 3d finite-element method and designed C++ optimization software. Electromagnetic analysis and performance comparison indicate that the proposed machine can achieve a torque enhancement of 68.6% compared to the comparison machine.
基金supported in part by the National Nature Science Foundation of China(NSFC)under Project 52122705。
文摘Better torque performance and higher reliability have long been the focus of research for slotted limited-angle torque motors(LATMs),which are primarily used to position first-stage valves in electrohydraulic servosystems.This paper presents a high reliability axial-flux slotted LATM with quasi-Halbach array for torque performance improvement including constant torque range(CTR)and output torque.Firstly,the structure with two sets of windings and the operation principle of the proposed slotted LATM is analyzed.Secondly,a brief design procedure is presented,the structure selections of open slot and double-stator single-rotor(DSSR)interior rotor with surface mounted quasi-Halbach permanent magnet(PM)array are illustrated,and the geometric parameters are optimized to obtain the optimal design of the proposed slotted LATM.Then,3-D finite-element method(FEM)is employed to compare the proposed slotted LATM with the conventional surface mounted PM slotted LATM in terms of cogging torque,no-load back EMF,and output torque,and the results show that the proposed LATM with quasi-Halbach array has a 10%improvement in output torque and a 25%improvement in CTR.Meanwhile,the flux linkages and torque performance of the two sets of windings under various conditions verify good magnetic isolation.Finally,prototypes of two different rotor types are manufactured and a series of experiments are performed to validate the analysis.
文摘With the cvolution of various high powerr-density machines, it beeomes important to optimize the power potential of machines of vastly different topologies with a variety of waveforms of back emf and current. The approach of tins paper is based oil the gencral-purpose sizing equations. which permit the optinlization method of machine power density to be applied to the axial-flux toroidal permanent-magnet (AFTPM) machine, and,furthermore, the power-production capabilities of the AFTPM machinc and the wen-known squirrel-cage indution machine are compared.
基金National Natural Science Foundation of China(No.51207072)
文摘The static characteristics of an axial-flux permanentmagnet( AFPM) machine with coreless stator were investigated.Two-dimensional analytical method for prediction of the no-load magnetic field in the AFPM machine with coreless stator was derived. Electromotive force( EMF) and axial attraction force were deduced from the analytical method. These values obtained from analytical method were compared with those from finite element method( FEM) and agree well. Finally,a prototype was built for experimental validation and back EMF was measured. The results confirmed the validity of the proposed analytical method.
文摘This paper deals with the design of high power – low dimensions axial-flux permanent-magnet motor intended for trac-tion application. First, two motor configurations are analytically designed and compared using finite element calcula-tion. Then, the configuration yielding the best performances is integrated and modelled with the whole traction chain under MATLAB/SIMULINK environment in order to demonstrate the motor operation on a large speed band.
文摘定子槽漏感是定子无轭模块化(yokeless and segmented,YASA)轴向磁通永磁电机电感的主要分量,会降低电机的功率因数和最大输出转矩。该文提出定子槽内微小单元磁场能量法计算YASA电机的定子槽漏感,通过建立计及铁心饱和影响的二维等效磁网络模型准确计算槽内微小单元储存的磁场能量,进而计算定子槽漏感。基于所提出的方法,进一步研究定子结构参数以及极槽配合对YASA电机定子槽漏感的影响规律。有限元仿真和实验结果表明,该文所提出的YASA电机定子槽漏感计算方法的可行性和准确性。
文摘为了满足定子无磁轭分块电枢(yokeless and segmented armature,YASA)轴向磁通永磁电机作为车用牵引电机时对输出转矩高平稳性的要求,提出一种基于永磁体径向均匀分段、分组同向偏移的方法来抑制YASA电机的齿槽转矩,以降低转矩脉动。应用三维有限元分析,分别研究了3种不同的永磁体分段方案对齿槽转矩的削弱效果,确定了磁极的最优偏转角度及其对电机综合性能的影响。仿真结果验证了该方法的可行性。YASA电机的齿槽转矩降低了92.62%,额定工况下转矩脉动下降了72.02%,永磁体涡流损耗降低91.28%,同时输出转矩下降不超过5.34%,提高了YASA电机的综合性能。