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22nd International Conference on Electrical Machines and systems, ICEMS 2019

作者： Zhiyong, Ma Hu, Yaohua Can, Chen Navy Military Representative Office in Nanjing Fourth Representative Office of the Navy in Nanjing Nanjing211106 China Electromechanical System Integration Nanjing Engineering Institute of Aircraft Systems Aviation Key Laboratory of Science and Technology on Aero Nanjing210016 China

ISBN: (纸本)9781728133980

This paper has proposed a novelty method to reduce the iron loss of a V-shaped interior permanent magnet (IPM) machine for traction applications. By optimizing the pole-arc to pole-pitch ratios of magnets and shaping the rotor iron, the total iron losses of initial model is extremely reduced, due to the harmonics of rotor magnetomotive force are reduced. The waveforms and harmonics of air gap flux density and flux density of stator core are studied. The core loss and core loss density of three IPM motors are analyzed and compared. The efficiency of the optimized V-shaped IPM machine can be improved under high speed condition by the reduction of iron loss. © 2019 IEEE.

关键词： Iron

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Study on load torque disturbance observation and compensation in electromechanical actuator

Study on load torque disturbance observation and compensatio...

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CSAA/IET International Conference on Aircraft Utility systems, AUS 2018

作者： Xi, Xiao Xia, Wu Liu, Chunqiang Wang, Yongqing Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing China Xian China

ISBN: (纸本)9781785617911

Compared with the traditional servo valve controlled hydraulic actuator(SHA), the electromechanical actuator(EMA) has the advantages of simple structure and easy maintenance. Aiming at the load torque ripple caused by the parameter perturbation and the random change of the load in the dynamic control of the electromechanical actuator, the load torque observation method of the electromechanical actuator is carried out. According to the mathematical model of electromechanical actuator, the expression of load torque estimation is deduced, and an online estimation method is designed to observe load torque in operation process and improve torque ripple caused by parameter perturbation. © 2018 IET Conference Publications. All rights reserved.

关键词： electromechanical actuators

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Electromagnetic performance analysis of external rotor IPM machine for aircraft applications

Electromagnetic performance analysis of external rotor IPM m...

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CSAA/IET International Conference on Aircraft Utility systems (AUS 2020)

作者： X. Huang Y. Hu P. Zhang Y. Zhang Fourth Representative Office of the Navy Navy Military Representative Office in Nanjing No 33 Shuige Raod Nanjing China Nanjing Engineering Institute of Aircraft Systems Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration No 33 Shuige Raod Nanjing China

This paper has proposed an external rotor fractional slot concentrated winding (FSCW) interior permanent magnet (IPM) machine for aircraft traction applications. The electromagnet performance at no-load condition such as air-gap flux density, flux linkage distribution, electromotive force (EMF), and cogging torque are studied. The electromagnet performance at rated-load condition such as average torque, torque ripple, and iron losses are investigated. It can be found that, the advantages of the external rotor IPM machine are high torque density, high power density, and simple structure.

关键词： machine windings electric potential permanent magnet machines torque rotors finite element analysis stators permanent magnet motors magnetic flux traction

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A study on electromagnet attraction characteristics based on Maxwell

A study on electromagnet attraction characteristics based on...

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CSAA/IET International Conference on Aircraft Utility systems, AUS 2018

作者： Yang, Le Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration AVIC NEIAS Nanjing China

ISBN: (纸本)9781785617911

The structure and working principles of airborne electromagnets were introduced and magnetic field analysis and electromagnetic attraction calculation were completed with Maxwell electromagnetic simulation software. By magnetostatic field analysis, the distribution diagrams of magnetic lines of force and magnetic induction intensity were obtained;by electromagnet attraction analysis, the electromagnet attraction was calculated and the impacts of materials, air gap and excitation on electromagnet attraction were examined, thus p roviding va luab le referen ce for electroma gn et op timi zation. © 2018 IET Conference Publications. All rights reserved.

关键词： Electromagnets

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Optimization on the transmission distance and efficiency of magnetic resonant WPT system

Optimization on the transmission distance and efficiency of ...

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CSAA/IET International Conference on Aircraft Utility systems, AUS 2018

作者： Chen, Wen-Xian Chen, Zhu-Ping Nanjing Engineering Institute of Aircraft System Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing China

ISBN: (纸本)9781785617911

This paper is mainly focused on the analysis of the transmission characteristics of the resonant WPT system to optimize the system parameters by improving the energy transfer efficiency and extending the transmission distance. Focns on improving the energy transfer efficiency and extending the transmission distance from the coil quality factor, coil structure, load selection and high frequency. © 2018 IET Conference Publications. All rights reserved.

关键词： Magnetic resonance

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Carrier based PWM with harmonics injection for multiphase induction motor drive

Carrier based PWM with harmonics injection for multiphase in...

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CSAA/IET International Conference on Aircraft Utility systems, AUS 2018

作者： Liu, Dong Mi, Chang-Bao Zhang, Kun Yu, Long-Ji Nanjing Engineering Institute of Aircraft System Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing China

ISBN: (纸本)9781785617911

The interest in multi-phase (number of phase higher than three) machines for high performance applications has been g rowing in recen t years du e to th ei r potential advantages over three-phase machines. To solve the problems of complex arithmetic in the multiphase Space Vector Pulse Width Modulation (SVPWM) control and low utilization ratio of dc bus voltage and low torque density in the multiphase Sinusoidal Pulse Width Modulation (SPWM) control, a multiphase carrier based PWM control method based on harmonics injection was analyzed. The proposed method improved the output voltage characteristic through injecting several harmonics signals to the standard sine fundamental signal. This paper, firstly, calculated the MMF distribution of a set of multiphase windings. Then, based on it, the magnetic field distribution of multiphase induction motor was discussed, and three kinds of multiphase carrier PWM technologies are compared. Theoretical analysis and experiment results show that the proposed multiphase carrier PWM method based on harmonics injection can enhance the dc bus voltage utilization ratio effectively, improve motor torque density and efficiency, while has the characteristics of low torque ripple and simple realization. © 2018 IET Conference Publications. All rights reserved.

关键词： Pulse width modulation

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Nonlinear Generalized Predictive Control of Permanent Magnet Synchronous Motor Based on Extended State Observer

Nonlinear Generalized Predictive Control of Permanent Magnet...

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Annual Conference of Industrial Electronics Society

作者： Yilun Liu Yongqing Wang Xiaokai Zhang Guangzhao Luo Siqi Li Yiyan Wang College of Automation Northwestern Polytechnical University Xi An China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing China

In order to improve robustness of permanent magnet synchronous motor (PMSM) servo system, a nonlinear generalized predictive control (NGPC) strategy based on extended state observer (ESO) is proposed. According to the NGPC theory, a NGPC controller is designed by using the continuous-time model of PMSM. In the case of the parameter variations and external load disturbance in the actual motor system, an ESO based on inverse hyperbolic sine function is introduced to estimate the total disturbance of the system and compensate dynamically in real time. The simulation results show that the proposed control strategy has good dynamic performance and strong robustness, providing an effective approach for engineering implementation.

关键词： Permanent magnet motors Servomotors Predictive control Predictive models Synchronous motors Robustness Load modeling

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Online parameter estimation of cold plate based on extended Kalman filter

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Energy Procedia 2019年 158卷 1850-1855页

作者： Hongsheng Jiang Sujun Dong Aicheng Li Fanxin Meng School of Aeronautic Science and Engineering Beihang University Beijing 100191 China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft Systems Nanjing 211106 China

The cold plate is a single-fluid heat exchanger, often used as the base of onboard electronic devices to cool it down through forced convection of fluid inside. It is not easy to monitor the status of the cold plate and device, due to the limitation of measurement and computing resource on the aircraft. This paper studies the dynamic characteristic of the cold plate by analyzing its typical structure, and a reduced model is derived and then transformed to state-space representation. Next, the extended Kalman filter is applied for online estimation of heat load and mass flow rate. Finally, different sample rates and measurements of detailed simulation data is fed to the algorithm for validation. Results show that monitoring temperature on the surface of device is enough to provide an accurate estimation of head load. Besides, it is suitable to set the sample time between 0.5s and 1.0s.

关键词： cold plate parameter estimation extended Kalman filter heat transfer online algorithm

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Dynamic temperature prediction of electronic equipment under high altitude long endurance conditions

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Chinese Journal of aeronautics 2018年第6期31卷 1189-1197页

作者： Liping PANG Miao ZHAO Kun LUO Yongli YIN Zhou YUE School of Aeronautic Science and Engineering Beihang University Beijing 100083 China National Key Laboratory of Human Factors Engineering China Astronaut Research and Training Center Beijing 100094 China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration. Nanjing 211102 China

Unmanned Aerial Vehicle（UAV） is developing towards the direction of High Altitude Long Endurance（HALE）. This will have an important influence on the stability of its airborne electronic equipment using passive thermal management. In this paper, a multi-node transient thermal model for airborne electronic equipment is set up based on the thermal network method to predict their dynamic temperature responses under high altitude and long flight time conditions. Some relevant factors are considered into this temperature prediction model including flight environment,radiation, convection, heat conduction, etc. An experimental chamber simulating a high altitude flight environment was set up to survey the dynamic thermal responses of airborne electronic equipment in a UAV. According to the experimental measurement results, the multi-node transient thermal model is verified without consideration of the effects of flight speed. Then, a modified way about outside flight speed is added into the model to improve the temperature prediction performance. Finally, the corresponding simulation code is developed based on the proposed model. It can realize the dynamic temperature prediction of airborne electronic equipment under HALE conditions.

关键词： Airborne electronic equipment High altitude long endurance Multi-node transient thermal model Node thermal network Temperature prediction

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Analysis and correction of oil leakage of a hydraulic actuator

Analysis and correction of oil leakage of a hydraulic actuat...

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CSAA/IET International Conference on Aircraft Utility systems, AUS 2018

作者： Liu, Bin Zhou, Qinghe Li, Bang Hu, Jiakun Nanjing Engineering Institute of Aircraft Systems Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing China

ISBN: (纸本)9781785617911

A batch of hydraulic actuators had an oil leakage failure. This paper introduces the sealing structure of oil seepage position and analyzes the reason of failure. After investigation, Tests and comparison of the production process of the backup ring with Russian standard of the similar backup ring, we found that the size of the backup ring of the product I unstable. This paper proposes the improved measure. The test and product use demonstrate that the improved measure is effective, and the trouble of failure is eliminated completely. © 2018 IET Conference Publications. All rights reserved.

关键词： Hydraulic actuators

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