Wenxiang Zhao (赵文祥)

Wenxiang Zhao (赵文祥)

Jiangsu University

H-index: 53

Asia-China

About Wenxiang Zhao (赵文祥)

Wenxiang Zhao (赵文祥), With an exceptional h-index of 53 and a recent h-index of 40 (since 2020), a distinguished researcher at Jiangsu University, specializes in the field of Electrical machines and drives.

His recent articles reflect a diverse array of research interests and contributions to the field:

Design and Analysis of a Surface-inserted Magnetic Screw With Minimum Thrust Force Ripple

Phase Winding Module Design of Fault-Tolerant Permanent-Magnet Machine With Reduced Torque Ripple

Minimum Copper Loss Fault-Tolerant Control of Zero Phase Shift Dual Three-Phase SPMSM by Using Reduced-Order Transformation Matrices

Fault-Tolerant Control for Permanent Magnet Motors

Method for reducing electromagnetic vibration of permanent magnet motor with fractional slot concentrated winding

Auxiliary Notching Rotor Design to Minimize Torque Ripple for Interior Permanent Magnet Machines

Modified Variable Time Delay Control for Dual Three-Phase Permanent-Magnet Synchronous Machines With Constraint on Random Number

Diversity of Stator Teeth Modulation Effect on Radial Pressure in PM Machines

Wenxiang Zhao (赵文祥) Information

University

Jiangsu University

Position

(江苏大学)

Citations(all)

9782

Citations(since 2020)

6089

Cited By

5580

hIndex(all)

53

hIndex(since 2020)

40

i10Index(all)

192

i10Index(since 2020)

152

Email

University Profile Page

Jiangsu University

Wenxiang Zhao (赵文祥) Skills & Research Interests

Electrical machines and drives

Top articles of Wenxiang Zhao (赵文祥)

Design and Analysis of a Surface-inserted Magnetic Screw With Minimum Thrust Force Ripple

Authors

Shunji Meng,Zhijian Ling,Wenxiang Zhao,Jinghua Ji,Meimei Xu

Journal

IEEE Transactions on Transportation Electrification

Published Date

2024/1/3

This paper proposes a surface-inserted magnetic screw (SIMS) for electrified aircraft applications, which exhibits low ripple, high force, and simple processing. The key of the proposed SIMS is to adopt unequal segments for minimum thrust force ripple. Firstly, the generation mechanism of the force ripple based on ripple period is investigated. Then, the uniform analytical expressions of force ripple with different segments are derived. Besides, the discrete analysis method is firstly used to evaluate the helical magnetic field. Based on the discrete analysis method, the helical magnetic field can be approximated as axi-symmetric, which greatly simplifying the analysis of force ripple. Afterward, the three-dimensional (3-D) finite element method (FEM) is applied to verify the accuracy of the discrete analysis method. Finally, the correctness of the theoretical analysis is verified by experiments.

Phase Winding Module Design of Fault-Tolerant Permanent-Magnet Machine With Reduced Torque Ripple

Authors

Jie Li,Wenxiang Zhao,Xiaopeng Zhao,Jinghua Ji,Yuhua Sun

Journal

IEEE Transactions on Energy Conversion

Published Date

2024/1/31

This paper designs a new phase winding module structure of the permanent-magnet machine in order to improve fault-tolerant capability while reducing torque ripple. In this design, phase winding module and tooth shoes shift are combined. Firstly, the phase winding module structure is introduced, and the design method is presented in detail. Secondly, the tooth shoes of the phase winding module structure are shifted symmetrically to reduce torque ripple. Thirdly, the theoretical comparisons of the conventional and proposed structures are investigated from the perspective of winding function, magnetomotive force harmonics, inductance and torque ripple suppression. Fourthly, the advantages of the proposed structure in improving the fault-tolerant capability and suppressing the torque ripple are verified by finite element method. Finally, a 3-phase permanent magnet machine and the proposed machine are …

Minimum Copper Loss Fault-Tolerant Control of Zero Phase Shift Dual Three-Phase SPMSM by Using Reduced-Order Transformation Matrices

Authors

Liang Xu,Hui Ren,Tingting Jiang,Guohai Liu,Wenxiang Zhao

Journal

IEEE Transactions on Energy Conversion

Published Date

2024/4/4

For the zero phase shift dual three-phase surface-mounted permanent magnet synchronous motors, the traditional fault-tolerant control (FTC) strategy can ensure the stable operation of under open-phase fault. However, the copper loss minimization was not considered. For this reason, an FTC strategy for open-phase and open-switch faults to minimize the copper loss is proposed in this paper. First, the zero phase shift vector space decoupling matrix is given and the mathematical model of the motor is derived. Then, the relationship between the six-phase currents and dqz -axis currents is analyzed. The minimum copper loss reference currents under open-phase and open-switch faults are determined based on the relationship between the dqz -axis current and copper loss. On the other hand, since the normal transformation matrix is no longer applicable to the faulty cases, a reduced-order vector space …

Fault-Tolerant Control for Permanent Magnet Motors

Authors

Qian Chen,Wenxiang Zhao

Published Date

2024/1/28

Five-phase permanent magnet synchronous motor (PMSM) has been widely studied and applied in many industrial fields because of its high efficiency, high power density, and wide speed range. With the improvement of safety and reliability requirements in these fields, it is of great significance to study the multi-phase motor drive system and its fault-tolerant control. Firstly, this chapter takes five-phase PMSM as the research object and makes a brief introduction to the common fault types and control methods. Then, two different fault-tolerant ideas based on the principle of minimum torque ripple and invariable magnetomotive force respectively are analyzed. Focusing on the latter, two methods of fault-tolerant and reduced-order matrix are derived. Furthermore, model predictive control (MPC), vector control (VC), and direct torque control (DTC) are used to realize fault-tolerant control according to the two different …

Method for reducing electromagnetic vibration of permanent magnet motor with fractional slot concentrated winding

Published Date

2024/3/28

The present disclosure provides a method for reducing the electromagnetic vibration of a fractional slot concentrated winding (FSCW) permanent magnet (PM) motor, which provides a guidance for the low vibration design of FSCW PM motor. The implementation of the method includes: Based on Nyquist Shannon sampling theorem, the modulation effect of electromagnetic force in the air gap is obtained, and the electromagnetic force component that contributes the most to the electromagnetic vibration of the FSCW PM motor is determined. The equivalent analytical model of PM flux density is established to obtain the phase relationship between different flux density harmonics. According to Maxwell stress equation, the internal relationship between each order of flux density harmonics and electromagnetic force harmonics is obtained. A new magnet structure of the PM motor is designed, and specific flux density …

Auxiliary Notching Rotor Design to Minimize Torque Ripple for Interior Permanent Magnet Machines

Authors

Meimei Xu,Wenxiang Zhao,Jinghua Ji,Qian Chen,Guohai Liu

Journal

IEEE Transactions on Industrial Electronics

Published Date

2024/1/17

This article proposes an auxiliary notch design method for the interior permanent magnet (IPM) machines for suppressing torque ripple. The key principle of this design method is to identify the main source of torque ripple, then guides the modification of reluctance variation along the rotor surface. First, the theoretical analysis of the torque ripple in IPM machines are investigated to guide the auxiliary notches design. Based on this, a spoke-type IPM machine with permanent magnet torque as the main component and a U-type IPM machine dominated by reluctance torque are analyzed, respectively. Additionally, the relationship between the shifted angle of the auxiliary notch and the order of torque ripple is revealed. Furthermore, the electromagnetic performances are investigated by the finite-element method. After using auxiliary notch design, the torque ripple is significantly reduced and the torque amplitude is …

Modified Variable Time Delay Control for Dual Three-Phase Permanent-Magnet Synchronous Machines With Constraint on Random Number

Authors

Chen Wang,Wenxiang Zhao,Tao Tao,Xinxing Zhang,Jichao Feng

Journal

IEEE Transactions on Energy Conversion

Published Date

2024/3/25

In order to suppress the switching frequency harmonics more effectively, this paper presents modified variable time delay pulse-width modulation control method for dual three-phase permanent-magnet synchronous machines with constraint on random number. Variable time delay control is an effective approach to spread the switching frequency harmonics with the fixed sampling periods. However, overly short randomized switching periods result in the clamping to the predefined lower switching period which accounts for the increase of average switching frequency and poor effect on switching frequency harmonics dispersion. The cause of the clamping to the predefined lower switching period in the conventional variable time delay method is theoretically detailed. Based on the analysis, the constraint on random number is proposed. The proposed method can avoid overly short switching periods. Therefore, the …

Diversity of Stator Teeth Modulation Effect on Radial Pressure in PM Machines

Authors

Yanxin Mao,Wenxiang Zhao,Huawei Zhou,Guohai Liu,Jinghua Ji

Journal

IEEE Transactions on Industrial Electronics

Published Date

2024/1/17

Recent literature has confirmed that a high-order radial pressure in airgap can induce significant low-order vibration due to the stator teeth modulation effect on radial pressure. The reported research on this modulation effect only focused on the conventional stator teeth topologies. However, for the permanent magnet (PM) machines, different stator teeth topologies lead to diverse paths for the transfer of pressure in airgap, resulting in varying vibration characteristics caused by the modulated radial pressures. It is plausible that dual or nonuniform modulation on radial pressure may be present. Therefore, to accurately predict and preferably reduce vibration, it is crucial to understand the diverse effects of different stator teeth modulation. In this article, first, the principle behind how the stator teeth modulate the radial pressure is explained. Second, the modulation effects of different stator teeth are detailedly analyzed …

Analysis and Design of a High Force Low Torque Ratio Magnetic Field Modulation Screw

Authors

Zhijian Ling,Shunji Meng,Wenxiang Zhao,Jinghua Ji,Meimei Xu

Journal

IEEE Transactions on Industrial Electronics

Published Date

2024/3/22

This article proposes a magnetic field modulated screw (MFMS), which exhibits high force low torque transmission ratio. Essentially, the proposed MFMS requires less torque to generate a significant thrust force. The “force per torque” ratio is 1.02 kN/N.m, which is 4 times higher than conventional MFMS. The proposed MFMS is analyzed based on three-dimensional (3-D) magnetic field modulation. Then, the uniform analytical expression of the “force per torque” ratio can be derived. The pole-pairs of the proposed MFMS are reasonably selected, resulting in a significant improvement in the “force per torque” ratio. Besides, a discrete analysis method is employed to analyze the circumferential and axial modulation in the MFMS. Based on this, the modulation process and performances of the proposed MFMS is analyzed and compared. Moreover, the 3-D Maxwell tensor method is first used to analyze the contribution of …

Single-phase Open-circuit Fault-tolerant Control for a Dual Five-phase Permanent Magnet Motor with Multi-operational Modes

Authors

Yu Liu,Qian Chen,Shulong Chen,Wenqiang Ding,Guohai Liu,Wenxiang Zhao

Journal

IEEE Transactions on Transportation Electrification

Published Date

2024/1/8

Traditional fault-tolerant strategies inevitably lead to an increase in the amplitude of the fault-tolerant current. In this paper, a new fault-tolerant control (FTC) method is proposed for single-phase open-circuit faults in a multi-operational mode dual five-phase permanent magnet (MODF-PM) motor. The proposed method takes advantage of the motor structural characteristics to keep the amplitude of the faulty stator phase currents under fault-tolerant conditions the same as that under healthy operation. Two main strategies, termed torque compensation method and flux regulation method, are proposed. On one hand, the q-axis current of the inner stator is used to compensate for the torque loss in the case of outer stator failure. On the other hand, the d-axis current is controlled to enhance the magnetic flux of the outer stator. However, in the case of inner stator failure, since the outer stator does not have the magnetization …

Generation Mechanism and Suppression Measure of Electromagnetic Vibration in Permanent Magnet Synchronous Machine: A Review

Authors

Shengdao Zhu,Wenxiang Zhao,Jinghua Ji,Guohai Liu,Christopher HT Lee

Published Date

2024/2/1

Permanent magnet synchronous machine (PMSM), has received extensive attention in electrified transportation system due to the high efficiency, high power density and compact structure. The electromagnetic (EM) vibration performance is an important specification for the PMSM, as it affects the passenger’s riding comfort and the noise grade of electrified transportation. This article comprehensively overviews the current research progress on the generation mechanism and suppression measures of EM vibration in PMSM. First, different excitations of the EM vibration of PMSM are discussed. In particular, the force modulation effect of stator teeth as a research hot spot provides a new perspective for EM vibration analysis, calculation, and suppression. Afterward, the EM vibration suppression measures are presented, including slot-pole combination selection, new EM structure design, advanced drive topology and …

2d meshless method for analyzing surface mounted permanent magnet machines

Published Date

2024/4/25

An analysis of a surface mounted permanent magnet (SPM) machine by a 2D meshless method is provided. The 2D meshless method includes steps: discrete nodes are arranged in the region to be solved; based on Taylor expansion and weighted least squares principle, the derivative value of vector potential can be approximated as a linear combination of vector potential values of each node in the support region; partial differential equations are converted into algebraic equations; by solving the algebraic equations, the vector potential of each node can be calculated, and then the distribution of the flux line and the flux density can be obtained. According to the electromagnetic calculation constraints of the machine, parameters such as the back electromotive force and electromagnetic torque of the machine can be obtained.

Direct Torque Control of DC-Biased Hybrid Excitation Machine with Adjustable Zero-Sequence Current

Authors

Liang Xu,Youhui Zhi,Tingting Jiang,Wenxiang Zhao,Shuangxia Niu

Published Date

2023/11/5

This article presents a direct torque control strategy for a DC-Biased hybrid excitation machine with zero-sequence current. The drive topology is first introduced and analyzed, and then the machine is mathematically modeled. Based on the characteristics of the model which has an additional current to adjust, a control strategy is raised. The strategy adjusts the duty cycle by varying the switching time, reserving the regulation time of the dc biased current for every switching cycle. Also, since conventional direct torque control suffers from unstable switching frequency and large torque and flux ripples, Space vector pulse width modulation method is introduced. In general, simulation results are consistent with the theoretical results, it indicates that by using the control strategy the machine can achieve accurate operating conditions and rapid dynamic torque response.

Reduction of unipolar leakage flux and torque ripple in consequent-pole PM vernier machine

Authors

Liang Xu,Yang Li,Wenxiang Zhao,Guohai Liu

Journal

CES Transactions on Electrical Machines and Systems

Published Date

2023/1/30

This paper proposes a new consequent-pole permanent magnet vernier machine (CPMVM), which can be regarded as a combination of two conventional CPMVM with opposite polarities. Based on the simplified axial magnetic circuit model, it is verified that the proposed CPMVM can reduce the unipolar leakage flux. In order to reduce the torque ripple of machine and improve the output torque of machine, the flux barrier is placed on the rotor of the proposed machine. Then, the parameters of the proposed CPMVM are optimized and determined. Moreover, the electromagnetic performance, including no-load air-gap flux density, average torque and torque ripple, flux linkage, back-electromotive force, cogging torque, average torque, torque ripple, power factor and loss, is compared with conventional surface-mounted permanent magnet vernier machine (SPMVM) and CPMVM. Finally, it is demonstrated that proposed …

Investigation of winding configuration on electromagnetic vibration in modular dual three-phase PM machine

Authors

Wenxiang Zhao,Qingjun He,Wei Tian,Yuhua Sun,Jinghua Ji

Journal

IEEE Transactions on Industrial Electronics

Published Date

2023/4/3

This article investigates the effect of winding configuration on the electromagnetic vibration of the 48-slot/8-pole modular dual three-phase (DTP) permanent magnet (PM) machine. First, two winding topologies are discussed based on the phase shift principle, and their phase shift angles are 30° and 60°, respectively. Second, the armature magnetomotive force (MMF) of different winding configurations is derived and compared. The modular DTP-PM machine with 30° phase shift produces the extra 2nd, 18th, 22nd, 26th, and 30th armature MMF harmonic components compared with the 60° phase shift one. Afterward, the electromagnetic force density and radial concentrated force of two modular DTP-PM machines are investigated. The result reveals that the modular DTP-PM machine with 30° phase shift induces the non-negligible 2nd-order vibration under the load condition. This is different from the modular DTP …

Harmonics Suppression for Dual Three-Phase Permanent Magnet motor With Multi-Subspace Model Predictive Control

Authors

Jia Cui,Mei Kang,Tao Tao,Wenxiang Zhao

Published Date

2023/5/12

The conventional virtual voltage vector (VV) based model predictive control for dual three-phase permanent magnet motor is a harmonic subspace open-loop scheme. This paper proposes a remedy method to realize a closed-loop predictive control both in fundamental and harmonic subspace. The harmonic-free VVs are synthesized in the fundamental subspace while the torque-free VVs are synthesized in the harmonic subspace. The optimal VVs are selected in respective subspaces using the predefined cost functions. Then, the duty cycle of the optimal harmonic-free VV is calculated according to the deadbeat principle of dq-axes current. The remaining duty cycle is proportionally allocated to the optimal torque-free VV. In this case, both fundamental and harmonic subspace can be controlled in a closed-loop scheme. Therefore, the harmonic currents and torque ripple can be further suppressed. The simulation …

Acoustic Noise Reduction for Low-Speed Sensorless Operation of Dual Three-Phase PMSM With Random Winding Injection

Authors

Xianqun Qiu,Yang He,Wenxiang Zhao,Mingyang Sun,Dao Zhou,Shibo Jin

Journal

IEEE Transactions on Energy Conversion

Published Date

2023/6/5

This article proposes a pseudorandom sinusoidal voltage signal with random winding injection method to improve the acoustic noise reduction performance for the dual three-phase permanent magnet synchronous motor (DTP-PMSM). Compared to the conventional pseudorandom frequency sinusoidal injection method, the proposed method achieves better noise reduction with similar performance in position estimation. Two fixed frequency signals are randomly selected as injection signals. Then, one of the two sets of windings of the DTP-PMSM is randomly chosen for injection. Due to this unique injection scheme, the injected frequency component in the response current can be reduced. Two pseudorandom numbers are generated synchronously by the digital signal system. The first random number selects two voltage signals with different frequencies. Meanwhile, one of the two sets of windings is chosen by the …

Torque production mechanism of switched reluctance machines with field modulation principle

Authors

Hao Hua,Wei Hua,Guishu Zhao,Ming Cheng

Journal

IEEE Transactions on Energy Conversion

Published Date

2020/9

The torque production mechanism of switched reluctance machines (SRMs) is investigated from the perspective of air-gap field modulation principle. The unipolar stator current excitations can be divided into DC and AC components and they induce the air-gap magneto-motive force (MMF) respectively. Meanwhile, thanks to the salient structure in SRMs, the air-gap MMFs induced by the two sources above can be modulated to obtain the synchronized air-gap fields for torque production. It is revealed that a multitude of field harmonics contribute to the torque together. The MMF-permeance model is built and the analytical deduction of the field modulation effect is provided, with which the orders of the field harmonics contributing to the torque output can be identified. Moreover, finite element method is employed to verify the predictions on various SRM topologies. Finally, aprototype machine is fabricated and measured …

Design and Analysis of a Non-Permanent-Magnet-Skewing Magnetic-Screw

Authors

Zhijian Ling,Weiqi Xu,Meimei Xu,Wenxiang Zhao

Published Date

2023/11/5

The magnetic screw is a kind of linear actuator that realizes the gearing action by the magnetic field of linear and rotary permanent magnets. However, the helical magnetic field constrains the development of the magnetic screw. This paper proposes a non PM skewing magnetic screw, which exhibits high force and simple processing. The key of the non PM skewing magnetic screw is adopting the dislocated block permanent magnets without any skewing. The non PM skewing magnetic screw lies in the 3-D magnetic field modulation, which couples the axial and circumferential magnetic fields. Based on this, the non PM skewing magnetic screw is able to convert rotation to translation while achieving the transmission action simultaneously. First, the topology of the non PM skewing magnetic screw is introduced. Then, the 3-D magnetic field modulation theory and operation characteristics are analyzed. Afterward, the 3 …

Analysis of a Fault-Tolerant Dual-Permanent-Magnet Vernier Machine With Hybrid Stator

Authors

Liang Xu,Zeyu Chen,Wenxiang Zhao,Tingting Jiang

Journal

IEEE Transactions on Transportation Electrification

Published Date

2023/12/22

A fault-tolerant dual-permanent-magnet vernier machine characterized by dual-sided permanent magnet and hybrid stator is proposed and analyzed in this paper, which not only possesses good fault tolerance but also offers improved torque density and power factor. First, operation principle of the machine is investigated by analyzing the permanent-magnet flux linkage and electromagnetic torque production due to the dual-sided permanent-magnet structure. Then, modulated single-phase armature-winding field and three leakage flux components are modeled. By considering magnetic field modulation process and dimensional parameters of the hybrid stator structure, the air gap inductance and three leakage inductance components as well as power factor of the machine can be accurately analyzed. In addition, the key design parameter analysis of proposed machine and the performance comparison with …

See List of Professors in Wenxiang Zhao (赵文祥) University(Jiangsu University)

Wenxiang Zhao (赵文祥) FAQs

What is Wenxiang Zhao (赵文祥)'s h-index at Jiangsu University?

The h-index of Wenxiang Zhao (赵文祥) has been 40 since 2020 and 53 in total.

What are Wenxiang Zhao (赵文祥)'s top articles?

The articles with the titles of

Design and Analysis of a Surface-inserted Magnetic Screw With Minimum Thrust Force Ripple

Phase Winding Module Design of Fault-Tolerant Permanent-Magnet Machine With Reduced Torque Ripple

Minimum Copper Loss Fault-Tolerant Control of Zero Phase Shift Dual Three-Phase SPMSM by Using Reduced-Order Transformation Matrices

Fault-Tolerant Control for Permanent Magnet Motors

Method for reducing electromagnetic vibration of permanent magnet motor with fractional slot concentrated winding

Auxiliary Notching Rotor Design to Minimize Torque Ripple for Interior Permanent Magnet Machines

Modified Variable Time Delay Control for Dual Three-Phase Permanent-Magnet Synchronous Machines With Constraint on Random Number

Diversity of Stator Teeth Modulation Effect on Radial Pressure in PM Machines

...

are the top articles of Wenxiang Zhao (赵文祥) at Jiangsu University.

What are Wenxiang Zhao (赵文祥)'s research interests?

The research interests of Wenxiang Zhao (赵文祥) are: Electrical machines and drives

What is Wenxiang Zhao (赵文祥)'s total number of citations?

Wenxiang Zhao (赵文祥) has 9,782 citations in total.

What are the co-authors of Wenxiang Zhao (赵文祥)?

The co-authors of Wenxiang Zhao (赵文祥) are Ming Cheng(程明), Wei Hua (花为), ruiwu cao(曹瑞武), Wei Wang (王伟).

    Co-Authors

    H-index: 77
    Ming Cheng(程明)

    Ming Cheng(程明)

    Southeast University

    H-index: 56
    Wei Hua (花为)

    Wei Hua (花为)

    Southeast University

    H-index: 25
    ruiwu cao(曹瑞武)

    ruiwu cao(曹瑞武)

    Nanjing University of Aeronautics and Astronautics

    H-index: 13
    Wei Wang (王伟)

    Wei Wang (王伟)

    Southeast University

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