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Compensation control of rotor mass eccentric vibration for bearingless induction motors
Yang, Zebin,Mei, Haitao,Sun, Xiaodong,Jia, Peijie The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.5
Aiming at the rotor mass eccentric vibration caused by the mechanical unbalance of a bearingless induction motor (BL-IM), an unbalance mass radius product (UMRP) strategy is proposed to compensate for rotor displacement. By analyzing the principle and influence of the unbalanced vibration of BL-IM's, a rotating coordinate system is established according to the rotor centroid, the size and orientation of the UMRP is sought by the search algorithm. Then the control signal for the unbalanced vibration compensation is calculated by the compensator, the centrifugal force caused by the mass unbalance is offset by the control signal, and the vibration amplitude of the rotor is weakened. Finally, the compensation effect is verified by the proposed strategy in the MATLAB/Simulink platform and an experimental prototype. Simulation and experimental results show that the rotor displacement peak-to-peak value about 10 ㎛. In addition, the radial displacement of the rotor is significantly reduced by the proposed compensation control strategy, and the anti-disturbance capability of the system is improved. The correctness and effectiveness of the proposed method are verified.
Speed Sensorless Control of Bearingless Induction Motors Based on Adaptive Flux Observer
Fang Wenxin,Yang Zebin,Sun Xiaodong,Wang Guangxin,Xu Ting 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.3
To realize the speed self-identifi cation of the suspension rotor in the low-cost operation control of a bearingless induction motor (BIM), a speed sensorless control strategy based on the adaptive fl ux observer is proposed. Firstly, the stability condition of the observer is analyzed by the small-signal linearization method, and the output errors of the observer in two stationary coordinate systems are transformed into the rotor magnetic fi eld rotating coordinate, and condition of the error feedback matrix satisfying the observer stability is obtained. Secondly, based on the construction of the full-order model of the controlled object, a feedback loop containing the measured object and its variable is designed, and a reduced-order speed observer is constructed to realize the speed self-identifi cation of the BIM. Finally, simulation and experimental verifi cation research are carried out on the BIM speed sensorless vector control system. Both simulation and experiment results show that the proposed speed self-identifi cation method can not only realize speed sensorless operation under no-load, speed change, an abrupt change of load eff ectively, but also make the motor has a good suspension performance.
Speed Sensorless Control of a Bearingless Induction Motor Based on Modified Robust Kalman Filter
Bian Yifan,Yang Zebin,Sun Xiaodong,Wang Xiang 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.3
To enhance the speed identifcation accuracy in speed sensorless control of a bearingless induction motor (BIM), a speed sensorless control strategy based on modifed robust Kalman flter is proposed. Firstly, the suboptimal principle of the H∞ control method is introduced into the extended Kalman flter to construct the robust Kalman flter. Secondly, the rotor fux linkage of the BIM in the α-β coordinate system is discretized, which is used as a reference model and adjustable model in the model reference adaptive system. At the same time, the modifed robust Kalman flter is obtained by combining the robust Kalman flter with the model reference adaptive system. Finally, the simulation and experimental results show that the proposed BIM speed sensorless control system based on modifed robust Kalman flter has higher accuracy of speed identifcation than the extended Kalman flter control under diferent operation conditions of no-load, sudden load, speed change, and motor parameter mismatch. The motor also has a good suspension performance.
Hongjin Qu,Lei Liu,Zhe Liu,Hongran Qin,Zebin Liao,Penglin Xia,Yanyong Yang,Bailong Li,Fu Gao,Jianming Cai 생화학분자생물학회 2019 Experimental and molecular medicine Vol.51 No.-
As a common serious complication of thoracic radiotherapy, radiation-induced pulmonary fibrosis (RIPF) severely limits radiation therapy approaches. Epithelial–mesenchymal transition (EMT) is a direct contributor to the fibroblast pool during fibrogenesis, and prevention of EMT is considered an effective strategy to inhibit tissue fibrosis. Our previous study revealed that TANK-binding kinase 1 (TBK1) regulates EMT in lung cancer cells. In the present study, we aimed to investigate the therapeutic potential of targeting TBK1 to prevent RIPF and EMT progression. We found radiationinduced EMT and pulmonary fibrosis in normal alveolar epithelial cells and lung tissues. TBK1 knockdown or inhibition significantly reversed EMT in vivo and in vitro and attenuated pulmonary fibrosis and collagen deposition. Moreover, we observed that TBK1 was elevated in a time- and dose-dependent manner by radiation. Meanwhile, radiation also induced time- and dose-dependent activation of AKT and ERK, each of whose inhibitors suppressed radiation-induced EMT. Intriguingly, silencing of TBK1 with shRNA also blocked the radiation-induced activation of AKT and ERK signaling. The ERK inhibitor did not obviously affect the expression of TBK1 or phosphorylated AKT, while AKT inhibition suppressed activation of ERK without changing the expression of TBK1. Finally, we found that a TBK1 inhibitor inhibited inflammatory cytokine expression in a RIPF model and Amlexanox protected normal cells and mice from ionizing radiation. In conclusion, our results indicate that the TBK1–AKT–ERK signaling pathway regulates radiation-induced EMT in normal alveolar epithelial cells, suggesting that TBK1 is a potential target for pulmonary fibrosis prevention during cancer radiotherapy
Design and Analysis of a Novel 16/10 Segmented Rotor SRM for 60V Belt-Driven Starter Generator
Xiaodong Sun,Zhengwang Xue,Shouyi Han,Xing Xu,Zebin Yang,Long Chen 한국자기학회 2016 Journal of Magnetics Vol.21 No.3
This paper proposes a novel 16/10 segmented rotor switched reluctance motor (SSRM) for belt-driven starter generators (BSGs). Different from conventional SRMs, the stator of the proposed SSRM consists of two types of stator poles, i.e., exciting and auxiliary poles, and the rotor is constructed from a series of discrete segments. The topology and operation principle of this proposed SSRM are illustrated firstly, and then the design rules are listed. In addition, the finite element method (FEM) is employed to get the static and dynamic characteristics of the proposed SSRM. Finally, the simulation results are presented to show the validity of the proposed SSRM for BSGs.