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2022 Joint Magnetism and Magnetic Materials - Intermag Conference, INTERMAG 2022

作者： Zhu, Lingfeng Wan, Yuan Jia, Yuqi Guo, Jian Li, Qiang Jiang, Xuefeng Nanjing University of Science and Technology Nanjing210094 China Avic Nanjing Engineering Institute of Aircraft System/Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing211102 China

ISBN: (纸本)9781665483346

The heating problem is a major concern for the design of high-speed permanent magnet motor (HSPMM). This paper first analyzed the copper loss of the litz wires of a slotless gramme-ring-winding HSPMM with gramme-ring windings, combining the analytical and finite-element methods. Then the computational fluid dynamics model was established for thermal analysis. Through the calculation of the loss and temperature field, the strand number and cross-section shapes were finally optimized for litz wires to pursue the minimum temperature rise of the motor, with the methods of DOE and second-order response surface. The proposed optimization process of the design of litz wires is also useful in other electric motors. © 2022 IEEE.

关键词： Winding

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A Numerical Solution of a Hose-And-Drogue Aerial Refueling system: Multi-body Dynamic Model with Varying Constraints 5th

A Numerical Solution of a Hose-And-Drogue Aerial Refueling S...

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5th China aviation science and technology Conference, 2021

作者： Fan, Boqian Ji, Kang Wang, Jian Nanjing Engineering Institute of Aircraft Systems AVIC Nanjing211106 China Aviation Key Laboratory of Science and Technology On Aero Electromechanical System Integration Nanjing211106 China

ISBN: (纸本)9789811674228

Probe-and-drogue aerial refueling is a widely used military technique for transferring fuel between aircrafts. A dynamic model for the study of the hose-and-drogue system requires three essential elements, which are the dynamics of the bodies, the external loads and the constraints on the bodies. However, in the most advanced models, either the reel behavior is absent or the interactions between the reel and the hose are ignored. In this paper a model is presented that fully reflects the dynamic behaviors of the hose-drogue system in a multi-body dynamic approach. In the model, the hose is represented by a series of discrete links, while the reel and drogue are represented by mass points connected to the hose. The interaction between the reel and the discrete links of the hose are treated as variable constraints to accurately reflect the hose-drogue system before and during the hose-probe contact. A numerical method based on Newton-Raphson iteration is proposed to solve the multi-body dynamic system with variable constraints. A demonstrative simulation reveals the performance of the method. In the simulation result, the take-up behavior of the hose is observed, which validates the model. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Hose

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Research on the Recognition of Aircraft Fuel Pump Parts Based on Deep Learning

Research on the Recognition of Aircraft Fuel Pump Parts Base...

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2022 CSAA/IET International Conference on Aircraft Utility systems, AUS 2022

作者： Cui, Zongtai Tian, Qilong Yang, Yang Yang, Chen Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing211106 China Nanjing Engineering Institute of Aircraft Systems AVIC Nanjing211106 China

ISBN: (数字)9781839537769

ISBN: (纸本)9781839537769

As it enables production lines to identify parts independently in their tasks, the application of machine vision has become the trend of flexible manufacturing development. In recent years, deep learning has achieved great success in the field of machine vision. It can recognize patterns with higher accuracy and better generalization, and can satisfy the demands of flexible manufacturing in a better way. In this paper, aiming at the recognition in the assembly line of aircraft fuel pumps, a parts recognition method based on depth learning is studied, an algorithm model for parts recognition based on Inception-v3 is obtained by the application of transfer learning method. The results show that by this way the accuracy of parts recognition could be above 90%, which can meet the demand of recognition accuracy in actual equipment production. © 2022 IET Conference Proceedings. All rights reserved.

关键词： Convolutional neural networks

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Study On The Shape Of Cogging Structure Of Rotor And Stator With Speed Sensor

Study On The Shape Of Cogging Structure Of Rotor And Stator ...

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2022 CSAA/IET International Conference on Aircraft Utility systems, AUS 2022

作者： Wang, Hongchao Jiang, Hongyan Lei, Tigao Wang, Yin Fan, Zhengmao Chen, Jin Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing China Nanjing Engineering Institute of Aircraft Systems AVIC Jincheng Jiangsu Nanjing211106 China

ISBN: (数字)9781839537769

ISBN: (纸本)9781839537769

The frequency of the output signal of the magneto-electric speed sensor is proportional to its rotate speed. The higher the amplitude of electromotive force is, the stronger the anti-interference ability of the sensor is. Based on a magneto-electric speed sensor, this paper briefly introduces its working principle. With the help of Maxwell simulation software, it describes the influence of the shape of cogging structure of stator and rotor on the electromotive force when the turns of coil cannot be changed, and gets the influence of different cogging structure on the electromotive force of the sensor. © 2022 IET Conference Proceedings. All rights reserved.

关键词： Stators

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Study On Short-Circuit Current Suppression Methods Of Dual-Winding Permanent Magnet Fault-Tolerant Machine For More Electric Aircraft Applications

Study On Short-Circuit Current Suppression Methods Of Dual-W...

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2022 CSAA/IET International Conference on Aircraft Utility systems, AUS 2022

作者： Hu, Yaohua Zhu, Shushu Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft Systems Nanjing China Nanjing University of Aeronautics and Astronautics Nanjing China

ISBN: (数字)9781839537769

ISBN: (纸本)9781839537769

This paper has studied the short-circuit current suppression methods of dual-winding permanent magnet fault-tolerant machine (PMFTM) for more electric aircraft applications. The cause of short circuit current is analysed, the thickness of stator tooth, the width of slot opening, and the split ratio are studied. Reducing the split ratio of the machine can increase the area of the stator slot accordingly to increase the number of winding turns, can effectively increase the self-inductance. Widening the tooth end thickness and reducing the slot opening width can increase leakage inductance, thus reducing the short-circuit current. A 8 kW, 12000 r/min prototype is manufactured, the analysis and simulation results are verified. © 2022 IET Conference Proceedings. All rights reserved.

关键词： Permanent magnets

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An Improved Speed Estimation Method for PMSM Using Speed Correction

An Improved Speed Estimation Method for PMSM Using Speed Cor...

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International Conference on Electrical Machines and systems (ICEMS)

作者： Weiqiang Sun Zhebin Yang Xiaojun Zhang Anqi Situ Yuqi Jia Jiaqiang Yang School of Electrical Engineering Zhejiang University Hangzhou China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing China

ISBN: (数字)9784886864406

ISBN: (纸本)9798350379105

Sensorless control technology has been received significant attention in recent years due to its advantages of reducing system size and cost while enhancing reliability. As a result, it has become a key focus in the field of motor control research. However, the speed regulation and load capacity of sensorless methods diminish during low-speed operation, thereby negatively impacting the performance across broad range. To address this issue, an improved speed sensorless estimation method for permanent magnet synchronous machines (PMSM) combined with speed correction is proposed, which use the principle of corrective parameter selection and current estimation error to correct speed estimation. The outcomes of the experiments indicate that proposed method still run stably under full load at 10% of the rated speed during low-speed operation, verifying the feasibility and effectiveness of the method.

关键词： Permanent magnet machines Estimation error Motor drives Fans Costs Sensorless control Regulation Steady-state Reliability Convergence

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Study on Redundancy Fault-Tolerant Control Strategy of Dual-Winding Permanent Magnet Machine for More Electric Aircraft Applications

Study on Redundancy Fault-Tolerant Control Strategy of Dual-...

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2022 CSAA/IET International Conference on Aircraft Utility systems, AUS 2022

作者： Ge, Yibo Hu, Yaohua Peng, Cong Nanjing University of Aeronautics and Astronautics Nanjing China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft Systems Nanjing China

ISBN: (数字)9781839537769

ISBN: (纸本)9781839537769

This paper has studied the redundancy fault-tolerant control (FTC) strategy of dual-winding permanent magnet synchronous machine (DWPMSM) for more electric aircraft applications. The open circuit fault (OCF) diagnosis, the short circuit fault (SCF) diagnosis, and the redundant communication policy are studied. The results show, when the system is normal, the two sets of windings of the DWPMSM work at the same time, and each windings outputs 50% of its own power. When the winding diagnosed as fault, which is shut off from the systems, then the fault signals are transported to the normal winding by redundancy communication function, and the control states of the normal winding are changed. © 2022 IET Conference Proceedings. All rights reserved.

关键词： Winding

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Data-Driven Based Model-Free MPC for DTP-PMSM with Optimized Space Vector

Data-Driven Based Model-Free MPC for DTP-PMSM with Optimized...

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International Conference on Electrical Machines and systems (ICEMS)

作者： Xiaojun Zhang Liang Yan Jiaqiang Yang Weiqiang Sun Yuqi Jia Anqi Situ College of Electrical Engineering Zhejiang University Hangzhou China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing China

ISBN: (数字)9784886864406

ISBN: (纸本)9798350379105

Finite control set model predictive control (FCS-MPC) has been extensively investigated owing to its numerous disadvantage, such as fast response and easy implementation. However, FCS-MPC is highly sensitive to system modeling and parameters, and its performance deteriorate when the system has unmodeled dynamics and parameter mismatches. To address this issue, a data-driven based model-free predictive current control (MFPCC) for dual-three phase permanent magnet synchronous machine (DTP-PMSM) is proposed, which use only the input and output data of the system instead of the accurate mathematical models and parameters. In addition, the virtual voltage vectors (V3s) is utilized to reduce the harmonic current. More specifically, the space vector is optimized for reducing the torque ripple. Simulation investigations on DTP-PMSM platform validate the superiority of the proposed strategy.

关键词： Permanent magnet machines Computational modeling Predictive models Harmonic analysis Vectors Data models Mathematical models Robustness Steady-state Torque measurement

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A strong robustness open-circuit fault diagnosis strategy for novel fault-tolerant electric drive system based on d-q-axis current signal

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Chinese Journal of aeronautics 2021年第10期34卷 115-127页

作者： Xuefeng JIANG Shaoshuai WANG Jie LI Daoyu WU Wenxin HUANG Zhenmao HAN School of Automation Nanjing University of Science and TechnologyNanjing 210094China College of Automation Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing 211106China

To diagnose the Open-Circuit(OC)fault in the novel fault-tolerant electric drive system,based on d-q-axis current signal,a strong robustness diagnosis strategy is proposed and *** independent power supplies and converters are required in the novel fault-tolerant electric drive system based on Dual-Winding Permanent Magnet Motor(DWPMM),and the system’s reliability,usage ratio and power density have been improved compared to the conventional fault-tolerant motor drive ***,the novel fault-tolerant electric drive system has the OC fault diagnostic false alarms issue when load changes suddenly or under light-load *** it lacks the research on the diagnostic method when the system encounters intermittent OC fault in power *** theory derivation,simulation and experimental verification,it can be concluded that the proposed strong robustness OC fault diagnosis strategy based on d-q-axis current signal can overcome the OC fault diagnostic false alarms issue when load changes suddenly or under light-load *** it can detect and locate the OC fault of single-phase winding in real time,and diagnose the intermittent OC fault of power switches.

关键词： Dual-winding motor Electric drive system Fault-tolerant system Open-circuit fault diagnosis Permanent magnet motor Strong robustness

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Three-dimensional flow field mathematical model inside the pilot stage of the deflector jet servo valve

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Journal of Zhejiang University-science A(Applied Physics & Engineering) 2022年第10期23卷 795-806页

作者： Shuang-lu LI Yao-bao YIN Jiang-yang YUAN Sheng-rong GUO School of Mechanical Engineering Tongji UniversityShanghai 201804China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Aviation Industry Corporation of ChinaNanjing 210061China

A new flow field mathematical model is proposed to describe accurately the flow field structure and calculate the static characteristics of the pilot stage in a deflector jet servo valve(DJSV). The flow field is divided into five regions, a 3D turbulent jet is adopted to describe the free jet region, and a velocity distribution expression of the jet is proposed. The jet entrainment model is put forward in the pressure recovery region to describe the coupling relationship between the pressure in the receiving chamber and the jet flow. The static characteristics, including pressure-flow characteristics, pressure characteristics,and flow characteristics of the pilot stage are obtained. The flow field structure and the static characteristics are verified by finite element analysis(FEA) and experiment, respectively, and the mathematical model results are in good agreement with the experimental and simulation results.

关键词： Deflector jet servo valve(DJSV) Pilot stage Three-dimensional jets Jets entrainment Static characteristics Mathematical model

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