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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.

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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

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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

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