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Li Teng,Yao Ming,Sun Xiaodong 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.1
To further improve the reliability of wheel-driven electric vehicles, this paper studies the fault-tolerant control operation of a fve-phase permanent magnet synchronous hub motor (PMSHM). A fault-tolerant scheme based on model predictive current control (MPCC) is proposed for the fve-phase PMSHM under single-phase open-circuit fault and two-phase open-circuit fault operation. In the implementation of this scheme, the fve-phase PMSHM model during fault operation is discussed, and the coordinate transformation matrices for single-phase fault, adjacent two-phase fault and non-adjacent two-phase fault are derived respectively. Through further analysis, the ofset voltage vector at the time of open-circuit fault can be obtained, and the newly obtained voltage vector can be used as the candidate set for model predictive control. The MPCC method combines duty cycle control and the vector preselection method. Compared with the traditional MPCC scheme, the improved MPCC scheme not only reduces the computation time but also enhances the steady-state performance of the control scheme. Finally, it is verifed that the proposed fault-tolerant scheme based on MPCC can efectively address the diference in open-loop fault operation and improve the reliability of the hub drive system.
Jianyi Sun,Xiaosun Liu,Qing Zhang,Yanyun Hong,BIN SONG,Xiaodong Teng,Jiren Yu 대한영상의학회 2016 Korean Journal of Radiology Vol.17 No.4
Standard therapy has not been established for thyroid cancer when a thyroidectomy is contraindicated due to systemic disease. Herein, we reported a patient who had hypertrophic cardiomyopathy and papillary thyroid carcinoma treated by radiofrequency ablation because of inability to tolerate a thyroidectomy. Radiofrequency ablation can be used to treat thyroid cancer when surgery is not feasible, although the long-term outcome needs further observation.