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Variable Coefficient Inductance Model-Based Four-Quadrant Sensorless Control of SRM
Song-Yan Kuai,Xue-Feng Li,Xing-Hong Li,Jinyang Ma 전력전자학회 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.6
The phase inductance of a switch reluctance motor (SRM) is significantly nonlinear. With different saturation conditions, the phase inductance shape is clearly changed. This study focuses on the relationship between coefficient and current in an inductance model with ignored harmonics above the order of 3. A position estimation method based on the variable coefficient inductance model is proposed in this paper. A four-quadrant sensorless control system of the SRM drive is constructed based on the relationship between variable coefficient inductance and rotor position. The proposed algorithms are implemented in an experimental SRM test setup. Experimental results show that the proposed method estimates position accurately in operating two/four-quadrants. The entire system also has good static and dynamic performance.
Variable Coefficient Inductance Model-Based Four-Quadrant Sensorless Control of SRM
Kuai, Song-Yan,Li, Xue-Feng,Li, Xing-Hong,Ma, Jinyang The Korean Institute of Power Electronics 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.6
The phase inductance of a switch reluctance motor (SRM) is significantly nonlinear. With different saturation conditions, the phase inductance shape is clearly changed. This study focuses on the relationship between coefficient and current in an inductance model with ignored harmonics above the order of 3. A position estimation method based on the variable coefficient inductance model is proposed in this paper. A four-quadrant sensorless control system of the SRM drive is constructed based on the relationship between variable coefficient inductance and rotor position. The proposed algorithms are implemented in an experimental SRM test setup. Experimental results show that the proposed method estimates position accurately in operating two/four-quadrants. The entire system also has good static and dynamic performance.
A Robust Adaptive Beamformer Based on Semidefinite Programming with Quadratic Constraints
Feng Shen,Jinyang Song 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.2
A robust beamforming with quadratic constraints, formulated as a semidefinite programming (SDP) problem, is proposed in this paper. With this formulation, the constraints on magnitude response can be easily imposed on the adaptive beamformer. And the non-convex quadratic constraints can be transformed into linear constraints. Therefore, the proposed method can be robust against the steering direction error. In practice, there are many array imperfections except steering direction error. In order to resist all kinds of array imperfections, the adaptive beamformer based on worst-case optimization technique is proposed by minimizing the array output power with respect to the worst-case array imperfections. Simulation results demonstrate that the proposed method is effective and can achieve a better performance.
High‑Efficiency Inhibition of Gravity Segregation in Al–Bi Immiscible Alloys by Adding Lanthanum
Peng Jia,Jinyang Zhang,Haoran Geng,Xinying Teng,Degang Zhao,Zhongxi Yang,Yi Wang,Song Hu,Jun Xiang,Xun Hu 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.6
The inhibition of gravity segregation has been a long-standing challenge in fabrication and applications of homogeneousimmiscible alloys. Therefore, the effect of rare-earth La on the gravity segregation of Al–Bi immiscible alloys was investigatedto understand the homogenization mechanism. The results showed that the addition of La can completely suppress thegravity segregation. This is attributed to the nucleation of Bi-rich liquid phase on the in-situ produced LaBi2phase and thechange of the shape of LaBi2@Bi droplets. In addition, a novel strategy is developed to prepare the homogeneous immisciblealloys through the addition of rare-earth elements. This strategy not only is applicable to other immiscible alloys, but alsois conducive to finding more elements to suppress the gravity segregation. This study provided a useful reference for thefabrication of the homogeneous immiscible alloys.
Adaptive Control with a Fuzzy Tuner for Cable-based Rehabilitation Robot
Jin Yang,Hang Su,Zhijun Li,Di Ao,Rong Song 제어·로봇·시스템학회 2016 International Journal of Control, Automation, and Vol.14 No.3
Since there are external uncertainties in the environment and the dynamic properties of human arm aretime-varying during movement, it is difficult to achieve good tracking performance during robot-aided rehabilitation. The purpose of this study is to develop an adaptive controller with a fuzzy tuner for a cable-based rehabilitationrobot. The fuzzy tuner can adjust the control parameters according to position error and the change of error, thus thetime-varying control parameters can be optimized by this tuner. To verify the proposed controller, simulation andexperiment studies using the cable-based rehabilitation robot are carried out. The rehabilitation robot is employedto complete two facilitation movements in the experiment. Results show that the adaptive controller can attain bettercontrol performance after tuning the control parameters.