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27th International Conference on electrical machines and systems, ICEMS 2024

作者： Li, Yiyang Gu, Xin Wang, Zhiqiang Guo, Liyan Chen, Wei Li, Xinmin Li, Chen School of Electronics and Information Engineering Tiangong University Tianjin China School of Electrical Engineering Tiangong University Tianjin China Tianjin Key Laboratory of Intelligent Control of Electrical Equipment Tianjin China National Local Joint Engineering Research Center of Electrical Machine System Design and Manufacturing China Zhejiang University Advanced Electrical Equipment Innovation Center Hangzhou China

ISBN: (纸本)9784886864406

Even if the exact motor parameters are known, the MTPA strategy cannot obtain precise maximum torque per ampere (MTPA) points under large current amplitude because the partial derivative of inductance to current is ignored in the modeling process. In view of this, the MTPA mathematical model considering the partial derivative of inductance to current is established in this paper, and the MTPA point tracking error caused by ignoring the partial derivative in the modeling process based on Ferrari method is analyzed. Then, an offline-online combined method for calculating the partial derivative term is proposed to compensate the MTPA tracking error. On this basis, an MTPA control strategy based on Ferrari method considering the partial derivative of inductance to current is proposed. Experiment to verify the feasibility and effectiveness of the proposed method. © 2024 The Institute of electrical Engineers of Japan.

关键词： Permanent magnets

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A Modified Method for Initial Rotor Position Detection of Brushless DC Motor Based on Voltage Vector Injection 4

A Modified Method for Initial Rotor Position Detection of Br...

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4th IEEE Student Conference on electric machines and systems, SCEMS 2021

作者： Zhou, Lu Li, Xinmin Chen, Wei Shi, Tingna Tianjin University School of Electrical and Information Engineering Tianjin China Tianjin Engineering Center of Electric Machine System Design and Control Tianjin China Zhejiang University College of Electrical Engineering Hangzhou China

ISBN: (纸本)9781665436816

In order to realize the rapid detection of initial rotor position of permanent magnet brushless DC motor (BLDCM) and reduce the application cost, an improved method of initial position of the motor rotor detection is proposed by combining the salient polarity and magnetic saturation of the motor itself. By successively injecting three voltage vectors into the motor winding and collecting the DC side current i dc at the specified time, the terminal voltage comparison circuit is also designed to compare the magnitude relationship between the inactive phase terminal voltage of c or b and Udc/2 under the action of effective vector, which can quickly and accurately judge that the motor rotor position is actually in a 30 degree sector. The feasibility and correctness of the proposed method are verified by the experiments. © 2021 IEEE.

关键词： Brushless DC motors

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Accurate MTPA control Based on Ferrari Method for IPMSM with Partial Derivative Term Calculation

Accurate MTPA Control Based on Ferrari Method for IPMSM with...

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International Conference on electrical machines and systems (ICEMS)

作者： Yiyang Li Xin Gu Zhiqiang Wang Liyan Guo Wei Chen Xinmin Li Chen Li School of Electronics and Information Engineering Tiangong University Tianjin China Tianjin Key Laboratory of Intelligent Control of Electrical Equipment Tianjin China School of Electrical Engineering Tiangong University Tianjin China National Local Joint Engineering Research Center of Electrical Machine System Design and Manufacturing China Zhejiang University Advanced Electrical Equipment Innovation Center Hangzhou China

ISBN: (数字)9784886864406

ISBN: (纸本)9798350379105

关键词： Inductance Analytical models Torque Accuracy Permanent magnet motors Mathematical models Trajectory

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Performance Analysis and Comparison of Different Corrugated Structures and a Novel Alternative Elliptical Twisted Tube in Supercritical Co2 Tower Solar Receivers

SSRN

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SSRN 2022年

作者： Liu, Yun Dong, Yue Li, Tao Zhang, Chuan-Zhi Hebei Key Laboratory of Low Carbon and High Efficiency Power Generation Technology School of Energy Power and Mechanical Engineering North China Electric Power University Baoding071003 China Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology Tianjin300384 China

The concentrated solar power generation system with supercritical CO 2 as working medium has high cycle efficiency, which can effectively reduce the volume of heat exchange equipment and reduce the investment cost. However, there is no systematic comparative study on the effect of tube structure on the performance of supercritical CO 2 , but the structure of tubes has a significant effect on the heat transfer performance of supercritical CO 2 , so it is necessary to study it. In this contribution, we firstly analyze the effects of different structures of tubes on the performance of supercritical CO 2 . Then, we design a novel alternative elliptical twisted tube. Finally, we further analyze the effects of the novel tube on the heat transfer performance of supercritical CO 2 by using the field synergy principle. The results show that the novel alternative elliptical twisted tube is the best structure. When the mass flow is 0.08 kg·s - © 2022, The Authors. All rights reserved.

关键词： Solar energy

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design and Analysis for Torque Ripple Reduction in Synchronous Reluctance machine.

Design and Analysis for Torque Ripple Reduction in Synchrono...

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International Conference on Magnetics (INTERMAG)

作者： D. Yan C. Xia L. Guo H. Wang T. Shi School of Electrical and Information Engineering Tianjin University Tianjin China Tianjin Engineering Center of Electric Machine System Design and Control Tianjin China

The rotor of transversally laminated synchronous reluctance motor is constructed with multi-flux barriers by stamping the laminated steel sheets and the machine is short for TLR-SynRM. It has obvious advantages of smooth rotor surface, and the lower copper loss, et al. [1]. Nevertheless, TLR-SynRM has the drawback of high torque ripple, and one of the main reasons is the non-sinusoidal distribution of the air-gap flux density caused by the spatial harmonics of stator magnetic potential and flux-barrier rotor configuration. In [2], it has been carried out the genetic algorithm (GA) optimizations to improve the angles of the flux-barrier ends to reduce the torque ripple. In this paper, it proposes the step-shaped gradient flux barriers in TLR-SynRM for torque ripple reduction.A method is presented to compute the reluctances of each layer of flux barriers through conformal mapping method. Based on this calculation, it is shown how the air-gap flux density distribution of TLR-SynRM can be analytically computed through magnetic equivalent circuit (MEC) method. Combining with the two methods, the flux-barrier parameters for torque ripple reduction can be improved and the final improved flux-barrier parameters are obtained.

关键词： Magnetics Conferences

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Research on effect of rotor geometry on irreversible demagnetization in permanent magnets of interior permanent magnet machine

Research on effect of rotor geometry on irreversible demagne...

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2017 IEEE International Magnetics Conference, INTERMAG 2017

作者： Guo, L. Xia, C. Wang, Z. School of Electrical Engineering and Automation Tianjin University Tianjin China Tianjin Engineering Center of Electric Machine System Design and Control Tianjin China

ISBN: (纸本)9781538610862

关键词： Permanent magnets

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A Current control Scheme of Brushless DC Motors Driven by Four-Switch Three-Phase Inverters

A Current Control Scheme of Brushless DC Motors Driven by Fo...

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作者： Xia, Changliang Wu, Dan Shi, Tingna Chen, Wei School of Electrical Engineering and Automation Tianjin University Tianjin300072 China Tianjin Engineering Center of Electric Machine System Design and Control Tianjin300387 China

Based on the brushless dc motor driven by a four-switch three-phase inverter (FSTPI), a current control scheme is proposed to reduce the current ripple of both the normal conduction region and the commutation region. Assuming c-phase winding is connected to the middle point of a dc-link capacitance, in the normal conduction region when a-phase and b-phase windings conduct, the current of c-phase may not be zero because of c-phase back electromotive force. The proposed strategy adds two regulating vectors into each control cycle based on the traditional PWM scheme, and controls the c-phase current to be zero by controlling the working time of the regulating vectors in each control cycle. In the commutation region, the noncommutated phase or the outgoing phase switch is modulated by comparing the change rate of the incoming and outgoing phase currents to maintain the noncommutated phase current constant. Compared with the traditional current control strategy, good control effect is kept in both the normal conduction region and the commutation region by accurately controlling the working time of the voltage vectors. The proposed strategy does not need to adjust the parameters of the controller, and it is simple and easy to implement. The experimental results prove the correctness and effectiveness of the control strategy. © 2013 IEEE.

关键词： Brushless DC motors

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AN OVERVIEW OF THE ROLE OF THE NAVSEA HUMAN-FACTORS engineering PROGRAM IN SHIP design

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NAVAL ENGINEERS JOURNAL 1983年第4期95卷 139-152页

作者： STEIN, NI BENEL, RA MALONE, TB Mr. Norman I. Stein:received his degree in mechanical engineering from the University of Iowa in 1943. MK Stein began his career with the Bureau of Ships Department of the Navy. After his military service with the Army of Occupation in Japan he has held positions with the Corps of Engineering Atomic Energy Commission Walter Reed Army General Hospital and the Protective Structures Development Center Department of the Army. He returned to the Naval Sea Systems Command in 1967 and is currently with the Manning and Controls Integration Branch SEA 55 W16. Mr. Stein is a registered professional engineer in New York state and also is a certified fallout shelter analyst with the Department of the Army. He has authored a comprehensive study on air distribution studies in multi-room shelters presentedpapers on human factors engineering to the Association of Scientists and Engineers and recently contributed a chapter on human factors engineering which will be incorporated in the proposed Naval Sea Systems Handbook on Surface Ship Design. Russell A. Benel:received his Ph. D. in engineering psychology from the University of Illinois at Urbana-Champaign. He is currently a Senior Research Scientist with Essex Corporation where he is the manager of the Man-Machine Systems Department. He has been responsible f o r scientific studies associated with the Human Factors Engineering f o r ships program under contract to the Naval Sea Systems Command specifically the development application and validation of human factors engineering technology f o r surface ship systems such as aircraft launch and recovery propulsion engineering combat direction weapons and total ship systems. He is currently providing Human Factors Engineering Support on the DDG-51. His other activities include a variety of research development test and evaluation activities for military systems. He had been with the Crew Performance Branch of the Crew Technology Division at the USAF School of Aerospace Medicine as a National Research Council Postd

This paper provides a context within which the role of human factors engineering (HFE) for Naval ship design may be understood. HFE is defined and its history as part of engineering design teams is traced. The role of HFE in ship systems design is defined, and the HFE Technology for Ships Program, managed by SEA 061R, is described. The rationale for inclusion of HFE in the design process is presented, the methodology whereby it is incorporated into the design process is detailed, methodology to assess the application of HFE is outlined, and the benefits that will accrue as a result of inclusion of HFE considerations in the design process are documented. The counterpoint to inclusion is illustrated through instances of design-induced human errors. A specific application of HFE in the acquisition process is illustrated through use of the Landing Craft, Air Cushion HFE program plan. The difficulties which may be encountered as the size of the target system expands are described. Potential roadblocks to the required incorporation of HFE are examined for their source and possible ameliorative steps.

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