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Permanent Magnet Temperature Estimation for PMSMs Using Virtual Position-offset Injection

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CES Transactions on Electrical Machines and Systems 2024年第1期8卷 51-60页

作者： Beichen Ding Yuting Lu Kaide Huang guodong feng Chunyan Lai IEEE the School of Intelligent Systems Engineering Sun Yat-sen UniversityShenzhen 518107China the Fosan University Foshan 528225China the Department of Electrical and Computer Engineering Concordia UniversityQCCanada

This paper proposes a virtual position-offset injection based permanent magnet temperature estimation approach for permanent magnet synchronous machines(PMSMs). The concept of virtual position-offset injection is mathematically transforming the machine model to a virtual frame with a position-offset. The virtual frame temperature estimation model is derived to calculate the permanent magnet temperature(PMT) directly from the measurements with computation efficiency. The estimation model involves a combined inductance term, which can simplify the establishment of saturation compensation model with less measurements. Moreover, resistance and inverter distorted terms are cancelled in the estimation model, which can improve the robustness to the winding temperature rise and inverter distortion. The proposed approach can achieve simplified computation in temperature estimation and reduced memory usage in saturation compensation. While existing model-based approaches could be affected by either the need of resistance and inverter information or complex saturation compensation. Experiments are conducted on the test machine to verify the proposed approach under various operating conditions.

关键词： PMSM Magnet temperature estimation Virtual position offset injection Inverter nonlinearity

Measurement and analysis of associated mimic muscle movements

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Journal of Otology 2015年第1期10卷 39-45页

作者： guodong feng Yuan Zhuang Zhiqiang Gao Department of Otolaryngology Peking Union Medical College Hospital China Medical Science Academy

Objective: To measure movements of markers over the primary site and associated mimic muscles in certain facial expressions, for evaluating facial paresis and synkinesis. Methods: Participants included 22 normal subjects aged 45e66 years. Maximum shift(Smax) and velocity(Vmax)were measured using a custom-designed 3-D dynamic quantitative analysis system of facial motion(3-D ASFM) based on motion capture technology. Measures were taken from peri-oral muscles during forceful brow raising and tight eye closure, and from muscles around the eye during grinning, right/left/bilateral mouth corner raising and smiling. Results: 1) During forceful brow raising, Smaxwas 3.65e4.46 mm for markers over perioral muscles, with the marker over the nasolabial fold showing a Vmaxgreater than others(60.60 mm/s on left and 62.70 mm/s on right). 2) In tight eye closure, Smaxof perioral muscle markers was 1.58e1.92 mm, with Vmaxbeing 11.40e14.76 mm/s. 3) In grinning, the largest eye muscle marker Smaxwas seen at the lower lid(3.93 mm on left and 4.15 mm on right) and the smallest at the inner canthus(1.59 mm on left and 1.53 mm on right), with the largest Vmaxseen at the upper lid and smallest also at the inner canthus(11.71 mm/s on left and11.09 mm/s on right). 4) In smiling, the largest non-oral Smaxand Vmaxwere seen at the upper lid(3.05 mm and 36.14 mm/s on left and 2.53 mm and 28.90 mm/s on right) and the smallest also at the inner canthus(0.69 mm and 7.22 mm/s on left and 0.77 mm and 7.80 mm/s on right). 5) In right mouth corner raising, Smaxand Vmaxat lateral and medial canthus and at lower lid were greater on right than left, while those at upper lid and brow were slightly greater on left than right. 6) In left mouth corner raising, Smaxand Vmaxat lateral canthus and upper and lower lids were greater on left than right. Conclusions: There are no absolute immobile points on the face when making facial expressions. In addition to the primary movement site, there are associated movem

关键词： Facial expression Associated movement 3-Dimensiona

Advances in diagnosis and non-surgical treatment of Bell's palsy

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Journal of Otology 2015年第1期10卷 7-12页

作者： Yang Zhao guodong feng Zhiqiang Gao Department of Otolaryngology Peking Union Medical College Hospital China Medical Science Academy

Bell’s palsy is a commonly seen cranial nerve disease and can result in compromised facial appearance and functions. Its etiology, prognosis and treatment are still being debated. This paper is a review of recent dev... 详细信息

关键词： Facial paralysis Non-surgical treatment Steroids

Core Loss Effect Modeling and Compensation for Improved MTPA Control of PMSM Drive under High-speed Conditions

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CES Transactions on Electrical Machines and Systems 2024年第4期8卷 436-446页

作者： Yuting Lu Beichen Ding Kaide Huang guodong feng IEEE School of Intelligent Systems Engineering Sun Yat-sen UniversityShenzhenChina School of Advanced Manufacturing Sun Yat-sen UniversityShenzhenChina School of Mathematics and Big Data Foshan UniversityFoshanChina

For permanent magnet synchronous machines(PMSMs),accurate machine model is critical for high performance maximum torque per ampere(MTPA)***,as motor speed increases,the nonlinearity such as core loss effect will affect the accuracy of machine model and thus the performance of online MTPA *** paper firstly investigates the performance of the model based MTPA control under different motor speeds through modeling,simulation and experiments,which indicates that the accuracy of MTPA control is greatly reduced especially under high-speeds due to machine ***,this paper proposes an efficient nonlinearity compensation model based on polynomial fitting to model and compensate the MTPA error as motor speed *** both core loss and magnetic saturation effects,the compensation model is a nonlinear polynomial of speed and stator *** obtain the fitting data,a derivative modeling method is proposed to compute the actual and detected MTPA angles under different speeds,in which the derivative model of torque to current ratio is fitted and the MTPA angle is obtained by setting the derivative model to *** proposed compensation model is both computation effective and easy to use for MTPA control,as it computes the compensation term that can be directly combined to other model-based *** proposed model is evaluated with experiments and comparisons on a test motor to show the performance improvement.

关键词： Permanent magnet synchronous machine Core loss Magnetic saturation Maximum torque per ampere(MTPA)

Quantitative Near-infrared Spectroscopic Analysis of Trimethoprim by Artificial Neural Networks Combined with Modified Genetic Algorithm

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Chemical Research in Chinese Universities 2014年第4期30卷 582-586页

作者： SHAN Hongyan FEI Yanqun HUAN Yanfu feng guodong FEI Qiang College of Chemistry Jilin University Changchun 130021 P. R. China Changchun Weiersai Biotec Pharmaceutical Co. Ltd. Changchun 130616 P. R. China

A novel method for rapid,accurate and nondestructive determination of trimethoprim in complex matrix was ***-infrared spectroscopy coupled with multivariate calibration（partial least-squares and artificial neural networks） was applied in the *** variable selection process based on a modified genetic algorithm with fixed number of selected variables was proceeded,which can reduce the training time and enhance the predictive ability when coupled with artificial neural network model.

关键词： Artificial neural network Genetic algorithm Near-infrared spectroscopy Trimethoprim

A process insight into production of ethyl levulinate via a stepwise fractionation

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Journal of Bioresources and Bioproducts 2024年第2期9卷 233-242页

作者： Yan Ma Hongxiao Wang Ziyang Wu Weihong Tan guodong feng Jianchun Jiang Institute of Chemical Industry of Forest Products Chinese Academy of ForestryNanjing 210042China Jiangsu Province Key Lab.of Biomass Energy and Material Nanjing 210042China National Engineering Lab.for Biomass Chemical Utilization Nanjing 210042China Co-Innovation Center of Efficient Processing and Utilization of Forest Resources Nanjing Forestry UniversityNanjing 210037China

Ethyl levulinate(EL)is a key biomass-derived compounds due to its socio-economic benefits for the synthesis of commodity ***,we proposed an efficient one-step bamboo conversion to EL in ethanol,and a novel stepwise fractionation to purify EL and lignocellulose degradation products.A proton acid,due to its high catalytic efficiency,yielded 26.65%EL in 120 min at 200℃.The productions of ethyl glucoside and 5-ethoxymethylfurfural were analyzed in terms of by-products *** the best of our knowledge,there is no single report on catalyst for one step synthesis of EL directly from bamboo,as well as a stepwise fractionation to purify *** to similar physiochemical properties in each fraction,the platform molecules could broaden a new paradigm of bamboo biomass utilization for renewable energy and value-added *** addition,glucose,ethyl glucoside,corn starch,and microcrystalline cellulose were also investigated as substrates,so that the reaction intermediates of this one-pot procedure were identified and a possible reaction mechanism was proposed.

关键词： Ethyl levulinate Liquefaction Biomass Ethanol By-products

Synthesis of Bio-base Plasticizer Using Waste Cooking Oil and Its Performance Testing in Soft Poly(vinyl chloride)Films

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Journal of Bioresources and Bioproducts 2019年第2期4卷 99-110页

作者： guodong feng Yan MA Meng ZHANG Puyou JIA Chengguo LIU Yonghong ZHOU Institute of Chemical Industry of Forest Products Chinese Academy of ForestNational Engineering Laboratory for Biomass Chemical UtilizationKey Laboratory of Biomass Energy and MaterialNanjing 210042China Jiangsu Qianglin Bio-Energy and Bio-Materials Limited Company Liyang 213364JiangsuChina Co-Innovation Center of Efficient Processing and Utilization of Forest Resource Nanjing Forestry UniversityNanjing 210037China

Waste cooking oil was modified to prepare bio-base plasticizers(a,b and c)with terephthalic acid,adipic acid and benzoic acid by transesterification,epoxidation and ring opening reactions,*** polyvinyl chloride(PVC)films(a/PVC,b/PVC and c/PVC)were prepared using a,b and c as bio-base *** epoxidation and ring opening reactions were mainly investigated through GC-MS *** structures of bio-base plasticizers(a,b and c)were confirmed by Fourier transform infrared spectroscopy(FT-IR),^(1)H NMR and ^(13)C *** mechanical properties of a/PVC were as good as those of PVC films with the dioctyl phthalate(DOP)***,the elongation at break of c/PVC reached 422%.The glass transition temperature(Tg)from dynamic mechanical analysis(DMA)was reduced to 30.6℃,45.3℃,23.6℃and 40.6℃,respectively when 40 phr of a,b,c and DOP plasticizer were *** of thermogravimetric analysis(TGA)illustrated that the thermal degradation stabilitiy of a/PVC films was better than those of c/PVC and DOP/*** volatility losses of a,b and c were lower than that of the ***-base plasticizers a and c exhibited excellent migration resistance in different solutions(distilled water,50%ethanol(w/w)).The FT-IR of PVC films showed that the downfield shifts of the—CH—Cl groups of the PVC plasticized with a and c were greater than that of b/*** bio-base plasticizers b had a better plasticizing effect at low temperature.

关键词： bio-base plasticizer ring opening reaction glass transition temperature migration resistance polyvinyl chloride(PVC)

Nonlinearity Estimation and Compensation for Accurate PMSM Modeling and Voltage Prediction

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CES Transactions on Electrical Machines and Systems 2024年第4期8卷 394-403页

作者： Beichen Ding Yuting Lu Chunyan Lai Weiwen Peng Kaide Huang guodong feng IEEE School of Advanced Manufacturing Sun Yat-sen UniversityShenzhen 510275China School of Intelligent Systems Engineering Sun Yat-sen UniversityShenzhen 510275China Department of Electrical and Computer Engineering Concordia UniversityMontrealCanada School of Mathematics and Big Data Foshan UniversityFoshan 528000China

For permanent magnet synchronous machine(PMSM),the machine model is critical to predict the operating states for motor control,which,however,can be greatly affected by system ***,this paper investigates accurate machine modeling for control and parameter *** the proposed approach,the PMSM model with saturated inductances is used as the base model,and this paper investigates modeling and compensation of the offsets to the base model due to system nonlinearities such as saturation and core loss effects for accurate machine modeling and voltage ***,the offsets to the base model are modeled using nonlinear functions with variable coefficients to compensate saturation and core loss effect,which can achieve better accuracy without changing the model structure.A differential estimation model is derived to estimate the model coefficients from a small amount of measurements with simplified ***,the model offset calculation is both computation and memory efficient with simplified *** contribution is to improve the machine model accuracy and achieve precise voltage prediction for practical ***,comparisons and the application to temperature estimation are conducted on a test interior PMSM to validate the proposed approach.

关键词： Core loss Differential modeling Multiparameter estimation PMSM

A Selective and Sensitive Fluorescence Probe for Se（IV） Based on Fluorescence Quenching of Gatifloxacin

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Chemical Research in Chinese Universities 2016年第5期32卷 736-741页

作者： LIU Qing HUAN Yanfu ZHENG Qingchuan FEI Qiang FEI Yanqun FAN Qian feng guodong SHAN Hongyan College of Chemistry Jilin University Changchun 130021 P. R. China Laboratory of Theoretical and Computational Chemistry Institute of Theoretical Chemistry Jilin University Changchun 130021 P. R. China Changchun WeiersaiBiotec Pharmaceutical Co. Ltd. Changchun 130616 P. R. China Changchun Vocational Institute of Technology Changchun 130033 P. R. China

A novel high selective and sensitive fluorescence probe termed gatifloxacin was discovered based on fluorescence ＂on-off＂ phenomenon in the presence of Se（IV）. In the Tris-HCl/acetonitrile（3：7, volume ratio, Tris-HCl 0.05 mol/L, pH=7.3） system, the fluorescence intensity of gatifloxacin was linearly decreased with the concentration increase of Se（IV） in a range of 1.0×10-5--5.0×10-5 mol/L with a correlation coefficient of 0.9979（R2=0.9958） and in a range of 5.0×10-5--1.0 ×10-4 mol/L with a correlation coefficient of 0.9973（R2=0.9946）. The detection limit of Se（IV） was 1.70×10-6mol/L.

关键词： Gatifloxacin Fluorescence probe Quenching Selenium