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Comparative Study of Linear Variable Flux Reluctance Machine with Linear Wound Field Flux Reversal Machine

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CES Transactions on Electrical Machines and Systems 2023年第1期7卷 73-80页

作者： Tingting jiang Liang Xu jinghua ji Wenxiang Zhao the School of Electrical and Information Engineering the Jiangsu Key Laboratory of Drive and Intelligent Control for Electric Vehicleand the National Center for International Research on StructuralHealth Management of Critical ComponentsJiangsu UniversityZhenjiang 212013China IEEE

As members of doubly salient magnetless linear machines,linear variable flux reluctance(LVFR)and wound field flux reversal(LWFFR)machines inherit the merits of conventional magnetless linear machines such as low cost,high flux adjustment capability and high reliability.Furthermore,like linear switched reluctance machine,they have a very simple and compact long secondary,which are very attractive for long stroke applications.However,low force capability is their major defect.To solve this issue,new LVFR and LWFFR machine topologies were proposed in recent work,while lacking studies on their force improvement mechanism and further force evaluation.In this paper,LVFR and LWFFR machines with improved force performance are comparatively studied with the emphasis on their force capabilities.The operation principle of the two machines is analyzed based on magnetic field harmonics produced by flux modulation.Contributions of air-gap flux density harmonic components to no-load back electromagnetic forces of the two machines are analyzed and the average force equation is derived.Moreover,force capabilities of the both machines are investigated by means of the time-stepping finite-element analysis to verify the theoretical analysis.

关键词： Wound field Variable flux reluctance Flux reversal Linear machine Finite-element analysis

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Modeling of Fault-tolerant Flux-switching Permanent-magnet Machines for Predicting Magnetic and Armature Reaction Fields

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CES Transactions on Electrical Machines and Systems 2022年第4期6卷 413-421页

作者： Ying Fang jinghua ji Wenxiang Zhao the School of Electrical and Information Engineering Jiangsu UniversityZhenjiang 212013China IEEE

The paper develops accurate analytical subdomain models for predicting the magnetic and armature reaction fields in fault-tolerant flux-switching permanent-magnet machines.The entire region is divided into five subdomains,followed by rotor slots,air-gap,stator slots,PM,and external air-gap imported to account for flux leakage.The coil turns and the remanence of magnets are adjusted by keeping the magnetic and electrical loading on the motor constant.The distance between the centers of two adjacent stator slots varies due to the introduction of faulttolerant teeth.According to the variable separation method,the general solution expression of each region can be determined by solving the partial differential systems of equations.The magnetic field distributions of subdomains are obtained by applying the continuity conditions between adjacent regions.Some analytical field expressions are represented as new forms under armature reaction field condition compared to those under no-load condition.Based on the developed analytical models,the flux density distribution and the electromagnetic performance can be calculated under no-load or armature reaction field condition separately.The finite element analysis is carried out to verify the validity of the proposed analytical model.

关键词： Armature reaction field Fault-tolerant fluxswitching machines Magnetic field distribution Permanentmagnet machine Subdomain model

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Vibration Reduction and Torque Improvement of Integral-slot SPM Machines Using PM Harmonic Injection

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Chinese Journal of Electrical Engineering 2023年第4期9卷 41-53页

作者： jinghua ji Deyou Liu Yu Zeng Tong Liu Wenxiang Zhao School of Electrical and Information Engineering Jiangsu UniversityZhenjiang 212013China

This study aimed to improve the vibration and torque of an integral-slot surface-mounted permanent magnet(SPM)machine by optimizing the shape of the harmonically injected permanent magnet(PM).First,the effect of the third harmonic injected into the sinusoidal PM shape on the electromagnetic performance of a 36-slot/12-pole SPM machine was investigated,including the torque performance and vibration response.It was found that the Sin+3rd harmonic-shaped PM had a contrary effect on the torque and vibration performance of the integral-slot machine,which improved the torque capability but worsened the vibration performance.Second,the response surface model and Barebones multi-objective particle swarm optimization algorithm based on a trade-off between the average torque and vibration were implemented to determine the optimal harmonic injection.Subsequently,the performances of the optimal Sin+3rd-shaped and eccentric PM machines were compared,showing the excellent torque and vibration performance of the adopted method.Finally,a prototype was manufactured and tested to verify the results of the theoretical analysis.

关键词： Integral-slot surface-mounted permanent magnet machine multi-objective optimization third harmonic torque vibration

Quantitative Comparison of Modular Linear Permanent Magnet Vernier Machines with and without Partitioned Primary

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Chinese Journal of Electrical Engineering 2023年第3期9卷 72-83页

作者： Yunpeng Xu jinghua ji Zhijian Ling Chen Wang Wenxiang Zhao School of Electrical and Information Engineering Jiangsu UniversityZhenjiang 212013China

A comparison of two modular linear permanent-magnet vernier(LPMV)machines is presented.A modular LPMV machine with a partitioned primary,which can significantly improve the modulation effect,is proposed.Benefitting from the partition design,the space conflict between the permanent magnet(PM)and the armature magnetic field is relieved.First,the topologies of modular LPMV machines with and without a partitioned primary are presented.Then,the effect of the partitioned primary on the modular LPMV machine is analyzed using flux modulation theory.Moreover,analytical expressions for the trapezoidal permeance are derived.In addition,the harmonic components,back electromotive forces,and thrust forces of the machines with and without the partitioned primary are comparatively analyzed.The results reveal that the thrust force density of the LPMV machine with a partitioned primary is increased by 32.3%.Finally,experiments are performed on a prototype machine for validation.

关键词： Linear permanent magnet machine partitioned primary flux modulation theory modular structure

Magnets Shifting Design of Dual PM Excited Vernier Machine for High-torque Application

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Chinese Journal of Electrical Engineering 2022年第3期8卷 90-101页

作者： Feilong Yan jinghua ji Zhijian Ling Yuhua Sun Wenxiang Zhao School of Electrical and Information Engineering Jiangsu UniversityZhenjiang 212013China

In this study,a novel dual permanent magnet excited vernier machine(DPMEVM)with magnets shifting in stator is proposed.Compared with the conventional permanent magnet synchronous machine(PMSM),the DPMEVM based on the bidirectional field modulation effect can operate in a wider torque range.However,the torque ripple of a conventional DPMEVM is high because of the superposition of the torque generated by the stator-side and rotor-side PMs.Consequently,a novel DPMEVM with magnets shifting is proposed to further reduce the torque ripple.First,the topologies and working principles of the baseline machine and proposed machines are introduced.Second,the torque-contribution harmonics are analyzed and calculated using the Maxwell tensor method.The calculation results reveal that the DPMEVM,benefiting from multiple working harmonics,can offer an enhanced torque capability compared to the PMSM.In addition,the torque ripple characteristics of the proposed machines are analyzed.It is verified that the torque ripple can be significantly reduced through magnets shifting.Third,the performances of the baseline machine and proposed machines are analyzed and compared in terms of flux density,open-circuit back-EMF,and torque characteristics.In addition,the proposed principle can be extended to machines with the same unit motor.Finally,a 120s-110p prototype machine is manufactured for validation.

关键词： Permanent magnet vernier machine bidirectional field modulation effect magnets shifting multiple working harmonics torque

Design to Improve Thrust Force Performance of Dual-side Primary Permanent-magnet Vernier Linear Motor

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中国电气工程学报(英文) 2023年第2期9卷 1-13页

作者： jinghua ji Xuhui Zhu Hongyu Tang Liang Xu Wenxiang Zhao School of Electrical and Information Engineering Jiangsu UniversityZhenjiang 212013China School of Electrical Engineering Nantong UniversityNantong 226019China School of Electrical and Information Zhenjiang CollegeZhenjiang 212028China

A novel dual-side primary permanent-magnet vernier linear(DS-PPMVL)motors is proposed.The novelty of the proposed motors is the design of asymmetric consequent poles on the mover,which can effectively enforce the flux-modulation effect and improve the thrust force performance.First,the topologies and operation principle are introduced.Subsequently,the structure relationships between the existing and proposed motors are discussed.Then,a unified analytical model is built.Accordingly,the magnetic field generated by the consequent pole is calculated.Meanwhile,the performance improvement mechanism with the asymmetric consequent pole is analyzed.To improve the efficiency of motor optimization,multi-objective optimization method is adopted to obtain the global optimal solution combination of structure parameters.The proposed motors exhibit higher thrust force,higher force density,less PM consumption,and better overload performance than the existing DS-PPMVL motor.Finally,experiments are conducted based on the existing prototype to verify the accuracy of the design and analysis.

关键词： Consequent pole dual-side motor flux modulation linear motor primary permanent-magnet

Model Predictive Torque Control for a Dual Three-phase PMSM Using Modified Dual Virtual Vector Modulation Method

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Chinese Journal of Electrical Engineering 2022年第4期8卷 91-103页

作者： Zhujin Ren jinghua ji Hongyu Tang Tao Tao Linsen Huang Wenxiang Zhao School of Electrical and Information Engineering Jiangsu UniversityZhenjiang 212013China School of Electrical and Information Zhenjiang CollegeZhenjiang 212028China

Single voltage vectors applied in the conventional model predictive torque control(MPTC)for multiphase motors do not only suffer from serious torque and stator flux ripples but also cause the large harmonic current.To address the aforementioned challenges,an MPTC using a modified dual virtual vector modulation method is proposed to improve the operational performance of a dual three-phase permanent magnet synchronous motor.Virtual voltage vectors are synthesized as the candidate control set to restrain the harmonic current.A transformation method is introduced to consider both the stator flux and torque in the duty cycle modulation.The torque and stator flux ripples are simultaneously reduced by addressing the limitations of nonuniform units.Furthermore,the null voltage vector is then inserted to expand the modulation range and improve the steady-state performance.Moreover,the sawtooth carrier is adopted to address the challenge of the asymmetric switch sequence caused by the modified modulation.Finally,the experimental results are presented to verify the effectiveness and superiority of the proposed MPTC method.

关键词： Model predictive torque control dual three-phase motor permanent magnet synchronous motor dual virtual vector modulation

Zero-sequence Current Suppressing Strategy for Dual Three-phase Permanent Magnet Synchronous Machines Connected with Single Neutral Point

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CES Transactions on Electrical Machines and Systems 2022年第4期6卷 465-472页

作者： Zongwang Li Yuxuan Du jinghua ji Tao Tao Wenxiang Zhao School of Electrical and Information Engineering Jiangsu UniversityZhenjiang 212013China IEEE

Dual three-phase permanent-magnet synchronous machines(DTP-PMSM)connected with a single neutral point provide a loop for zero-sequence current(ZSC).This paper proposes a novel space vector pulse width modulation(SVPWM)strategy to suppress the ZSC.Five vectors are selected as basic voltage vectors in one switching period.The fundamental and harmonic planes and the zero-sequence plane are taken into consideration to synthesis the reference voltage vector.To suppress the ZSC,a non-zero zero-sequence voltage(ZSV)is generated to compensate the third harmonic back-EMF.Rather than triangular carrier modulation,the sawtooth carrier modulation strategy is used to generate asymmetric PWM signals.The modulation range is investigated to explore the variation of modulation range caused by considering the zero-sequence plane.With the proposed method,the ZSC can be considerably reduced.The simulated and experimental results are presented to validate the effectiveness of the proposed modulation strategy.

关键词： Zero-sequence current a single neutral point dual three-phase permanent-magnet synchronous machine third harmonic back-EMF

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Design Optimization and Comparison of Linear Magnetic Actuators under Different Topologies

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Chinese Journal of Electrical Engineering 2020年第1期6卷 41-51页

作者： Zhijian Ling jinghua ji Tao Zeng Wenxiang Zhao School of Electrical and Information Engineering Jiangsu UniversityZhenjiang 212013China Nanjin Canneng Electric Power Automation Co. Ltd.Nanjing 211199China

In this study,several types of linear actuators that adopt different permanent-magnet(PM)topologies are studied and compared.These linear actuators are based on the concept of PM magnetic screw transmission,which offers high force density,high reliability,and overload protection.Using different magnetic configurations and assembly methods,these linear actuators are designed and optimized for a fair comparison.Initially,based on the operating principle and maximum thrust force,the surface-mounted magnetic screw is described and optimized.Furthermore,the embedded magnetic screw,Halbach array magnetic screw,and field modulated magnetic screw are investigated and compared.Their electromagnetic performances,such as thrust force,torque,magnetic losses,and demagnetization effects are analytically assessed and verified using finite-element analysis.Finally,a prototype of the surface-mounted magnetic screw is developed to validate the predictions.

关键词： Linear actuator magnetic screw high force permanent magnet finite-element analysis