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CES Transactions on Electrical Machines and Systems 2024年第1期8卷 3-11页

作者： qiang Wei z.q.zhu Yan Jia Jianghua Feng Shuying Guo Yifeng Li Shouzhi Feng Department of Electronic and Electrical Engineering The University of SheffieldSheffield S13JDU.K. IEEE the CRRC zhuzhou Institute Company Ltd. Zhuzhou 412001China

In this paper,the electromagnetic performance of variable flux memory(VFM)machines with series-magnetic-circuit is investigated and compared for different rotor *** on a V-type VFM machine,five topologies with different interior permanent magnet(IPM)arrangements are evolved and optimized under same *** on two-dimensional(2-D)finite element(FE)method,their electromagnetic performance at magnetization and demagnetization states is *** reveals that the iron bridge and rotor lamination region between constant PM(CPM)and variable PM(VPM)play an important role in torque density and flux regulation(FR)***,the global efficiency can be improved in VFM machines by adjusting magnetization state(MS)under different operating conditions.

关键词： Memory machine Permanent magnet Rotor topologies Series magnetic circuit Variable flux

Investigation of Optimal Split Ratio of 6-Slot/2-pole High Speed Permanent Magnet Motor with Toroidal Winding

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CES Transactions on Electrical Machines and Systems 2022年第4期6卷 343-351页

作者： F.Xu T.R.He z.q.zhu H.Bin D.Wu L.M.Gong J.T.Chen the University of Sheffield Department of Electronic and Electrical EngineeringMappin StreetSheffieldS13JDUK IEEE Motors and Drives Center Midea Group Corporate Research CenterShanghai200131China

Split ratio,*** ratio of stator inner diameter to outer diameter,has a closed relationship with electromagnetic performance of permanent magnet(PM)*** this paper,the toroidal windings with short end-winding axial length are employed in the 6-slot/2-pole(6s/2p)PM motor for high speed *** split ratio is optimized together with the ratio of inner slot to outer slot area,*** ratio,considering stator total loss(stator iron loss and copper loss).In addition,the influence of maximum stator iron flux density and tooth-tip on the optimal split ratio,slot ratio,and average torque is *** analytical predictions show that when the slot ratio is 0.5,the maximum torque can be achieved,and the optimal split ratio increases with the decrease of slot ratio,as confirmed by the finite element(FE)***,some of predicted results are verified by the measured results of 6s/2p prototype motor with 0.5 slot ratio.

关键词： High speed Optimal split ratio Permanent magnet motor Slot ratio Toroidal winding

Enhancement of Torque Density in Wound Field Switched Flux Machines with Partitioned Stators Using Assisted Ferrites

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Chinese Journal of Electrical Engineering 2021年第3期7卷 42-51页

作者： zhongze Wu z.q.zhu Shun Cai Wei Hua Wentao zhang School of Electrical Engineering Southeast UniversityNanjing 210096China Department of Electronic and Electrical Engineering University of SheffieldSheffield S102TNUK

In this paper,ferrites are applied in a partitioned stator wound field switched flux(PS-WFSF)machine to increase the air-gap flux density,and hence,the average electromagnetic torque and overload *** short-circuited ferrites in the inner stator in the PS-WFSF machine can increase the open-circuit phase fundamental back-EMF and average electromagnetic torque at a 60 W copper loss by 2.33%and 3.77%,***,the proposed PS-WFSF machine with ferrites can exhibit a better overload capability than conventional PS-WFSF machines without ferrites,e.g.,a 7.36%torque increment can be achieved when the copper loss is 120 *** torque increment mechanism is analyzed and verified using finite element(FE)***,the demagnetization of the ferrites in the proposed machine under rated on-load and overload conditions is *** prototypes of the proposed PS-WFSF machine with ferrites and a conventional one without ferrite are built and tested to validate the analytical and FE analyses.

关键词： Average electromagnetic torque ferrite flux switching partitioned stator switched flux torque improvement wound field

Optimal Split Ratio in Small High Speed PM Machines Considering Both Stator and Rotor Loss Limitations

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CES Transactions on Electrical Machines and Systems 2019年第1期3卷 3-11页

作者： J.Ma z.q.zhu Department of Electrical and Electronic Engineering The University of SheffieldSheffieldS13JDU.K.

The split ratio which is defined as the ratio between rotor and stator outer diameters is critical for permanent magnet(PM)*** this paper,the split ratio in small high speed PM machines is optimized analytically by considering both stator and rotor loss *** this way,the thermal constrains in both stator and rotor parts can be taken into *** shows that both losses can significantly affect the optimal split ratio and the machine *** considering the influence of rotor losses,especially the rotor eddy current loss,the optimal split ratio is increased significantly in certain *** output torque is calculated analytically and the influences of several key design parameters on the optimal split ratio,***/pole combinations and magnet materials,are also investigated in ***,finite element(FE)analyses are carried out for validating of the analytical model.

关键词： Index Terms-High speed permanent magnet split ratio.

Hybrid Excited Permanent Magnet Machines for Electric and Hybrid Electric Vehicles

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CES Transactions on Electrical Machines and Systems 2019年第3期3卷 233-247页

作者： z.q.zhu S.Cai Department of Electronics and Electrical Engineering University of SheffieldSheffieldS13JD U.K

This paper reviews various hybrid excited(HE)machines from the perspective of location of PM and DC excitation,series/parallel connection of PM and DC excited magnetic fields,and 2D/3D magnetic fields,*** advantages as well as drawbacks of each category are *** an additional control degree,*** excitation,is introduced in the HE machine,the flux weakening control strategies are more *** flux weakening performance as well as efficiency are compared with different control ***,the potential to mitigate the risk of uncontrolled overvoltage fault at high speed operation is highlighted by controlling the field *** additional DC coils are usually required for HE machines compared with pure PM excitation,the spatial confliction inevitably results in electromagnetic performance ***,the technique to integrate the field and armature windings with open-winding drive circuit is introduced,and novel HE machines without a DC coil are summarized.

关键词： Electric vehicle(EV) flux weakening control hybrid electric vehicle(HEV) hybrid excited(HE)machine open-winding permanent magnet(PM).

Influence of Rotor Iron Bridge Position on DC-winding-induced Voltage in Wound Field Switched Flux Machine Having Partitioned Stators

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Chinese Journal of Electrical Engineering 2021年第3期7卷 20-28页

作者： zhongze Wu z.q.zhu Chao Wang Wei Hua Kai Wang Wentao zhang School of Electrical Engineering Southeast UniversityNanjing 210096China Department of Electronic and Electrical Engineering University of SheffieldSheffield S102TNUK College of Automation Nanjing University of Aeronautics and AstronauticsNanjing 211106China

In this study,the influence of the position of the rotor iron bridge on the DC-winding-induced voltage pulsation in a partitioned stator wound field switched flux machine is *** and finite element(FE)analyses show that both the open-circuit and on-load DC-winding-induced voltages can be minimized by positioning the rotor iron bridge adjacent to the inner air gap closer to the DC *** is due to a smoother inner air-gap magnetic reluctance while maintaining the average electromagnetic torque at 92.59%of the maximum *** analyzed machine with the rotor iron bridge adjacent to the inner air gap is prototyped,and the experimental results validate the analytical and FE results.

关键词： DC winding induced voltage flux switching iron bridge partitioned stator switched flux wound field

Influence of Inner/Outer Stator Pole Ratio and Relative Position on Electromagnetic Performance of Partitioned Stator Switched Flux Permanent Magnet Machines

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CES Transactions on Electrical Machines and Systems 2019年第3期3卷 259-268页

作者： J.T.Shi z.q.zhu Department of Electronic and Electrical Engineering The University of Sheffield3 Solly StreetSheffieldS14DEUK

Based on the 6-pole outer stator(armature winding-stator),the influence of inner(permanent magnet-stator)/outer stator pole ratio n(n=NIS/NOS),stator relative positions and rotor pole number combinations on electromagnetic performance of partitioned stator switched flux permanent magnet(PM)machines(PS-SFPMMs)is investigated in this *** the armature windings and PMs are located in two separated stators and PMs are stationary,PS-SFPMMs have high fault tolerance *** maximize the torque performance,the PM of inner stator pole should be aligned with outer stator pole when n is odd while the iron rib of inner stator pole should be aligned with outer stator pole when n is *** matter what n is selected,the rotor pole number NR can be any integers except the phase number and its *** analysis results indicate that the optimal NR is closed to(NIS+NOS)/2 and it is odd when n is odd while it is even when n is ***,symmetrical phase back-EMF waveform will be obtained when the ratio of Min(NOS,NIS)to the greatest common divisor of Min(NOS,NIS)and NR is *** on the optimal rotor pole numbers for 6-pole outer stator with different n and corresponding optimal relative position together with same rated copper loss,the average torque is improved by 18.4%,25.1%and 25.7%respectively in PS-SFPMMs with n equal to 2,3 and 4 when compared with PS-SFPMM with n equal to *** analyses are validated by experiment results of the prototype machine.

关键词： Inner/outer stator partitioned stator permanent magnet pole ratio relative position switched flux.

Using Inverter-Based Renewable Generators to Improve the Grid Power quality-A Review

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Chinese Journal of Electrical Engineering 2018年第4期4卷 16-25页

作者： Tao Wang Heng Nian z.q.zhu Department of Electronic and Electrical Engineering University of SheffieldSheffieldS13JDU.K. College of Electrical Engineering Zhejiang UniversityHangzhou 310027China

With the increasing penetration of renewable power in the grid,renewable generators are expected to play more important roles rather than merely working as active power *** the high controllability and considerable idle capacity of the inverter-based renewable generators,various auxiliary functions for them have been studied to benefit the *** these auxiliary functions,the grid power quality improvement is very *** paper presents a review of the emerging control strategies for inverter-based renewable generators to improve grid power *** related papers are classified with different power quality issues and technical routes,and a comprehensive comparison is *** future trends of this research area are also discussed.

关键词： Renewable generator auxiliary function power quality improvement grid voltage harmonic and unbalance

On-Load Voltage Distortion Compensation Method Using Disturbance Observer for SPM Machines with Closed Slot

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Chinese Journal of Electrical Engineering 2015年第1期1卷 58-69页

作者： Beomseok Lee z.q.zhu D.Wu Department of Electronic and Electrical Engineering University of SheffieldSheffieldS13JDUK

This paper proposes an on-load voltage distortion compensation method,in which the voltage distortion is mainly produced in the surface-mounted permanent magnet machines having closed *** from the voltage distortions caused by the inverter,such as dead time and inverter non-linearity,the on-load voltage distortion has relatively large magnitude dependent of machine *** a result,it causes a significant distortion of current waveforms and deteriorates control ***,a voltage disturbance compensation method using a disturbance observer is proposed and *** on the machine model,the disturbance observer is chosen which helps to observe a voltage disturbance,while the error between measured and estimated currents is *** disturbance observer only compensates the sixth-multiple harmonic components of the inverter voltage in synchronous reference *** harmonic compensator with multiple narrow-band pass based adaptive filter is proposed and implemented in the feedback loop with current *** observed voltage disturbances are compensated to the reference *** addition,robust performance of the proposed method is shown against the parameter *** effectiveness of the proposed compensation scheme is validated by the experiments.

关键词： Closed slot disturbance observer inverter non-linearity on-load voltage distortion surface-mounted permanent magnet(SPM)machines

Flux Adjustable Permanent Magnet Machines:A Technology Status Review

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Chinese Journal of Electrical Engineering 2016年第2期2卷 14-30页

作者： Hui Yang z.q.zhu Heyun Lin Wenqiang Chu School of Electrical Engineering Southeast UniversityNanjing210096China Department of Electronic and Electrical Engineering University of SheffieldSheffield SI 3JDU.K.

Flux adjustable permanent magnet machines(FAPMMs)are a novel type of permanent magnet(PM)machines which are able to flexibly adjust the field excitation flux linkage and offer the distinctive advantages of high power density and high *** have attracted ever-increasing interests and are promising candidate machines for electric vehicle,machine-tool and aircraft *** this paper,the state-of-the-art of various FAPMMs are comprehensively reviewed according to three means of flux-adjustment,*** adjusted by either auxiliary field windings or armature winding change,mechanically adjusted magnetic reluctances of flux paths,and memory machines by magnetizing/demagnetizing *** corresponding flux-adjustable principles and electromagnetic characteristics are systematically elaborated and quantitatively *** merits and demerits are highlighted,together with their recent developments.

关键词： Flux-adjustable hybrid excitation memory machine mechanical adjustment permanent magnet machine winding change