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Xiao L.,Huazhong University of Science and Technology | Li J.,Huazhong University of Science and Technology | Qu R.,Huazhong University of Science and Technology | Jia S.,Huazhong University of Science and Technology | Guo S.,Zhuzhou Electrical Locomotive Research Institute
2015 18th International Conference on Electrical Machines and Systems, ICEMS 2015 | Year: 2015

This paper analyzes the conventional windings, detached windings and alternative windings for vernier reluctance dual-stator axial flux machines. The connection of winding configurations is firstly given, followed by a comprehensive comparison in aspects of no load flux linkage, cogging torque, rotor unbalanced axial force, torque, torque ripple and iron loss. © 2015 IEEE. Source


Yang Z.,Beijing Jiaotong University | Huang X.,Beijing Jiaotong University | Wu S.,Southwest Jiaotong University | Peng H.,Zhuzhou Electrical Locomotive Research Institute
2010 International Power Electronics Conference - ECCE Asia -, IPEC 2010 | Year: 2010

By analyzing the traction technologies used in existing locomotives and high speed trains, the development and current situation of traction technology were described, and some urgent problems which need to be solved were presented. Firstly DC motor traction technologies used in Chinese railway were introduced, the development process of DC to AC motor traction locomotives were summarized. Secondly several types of CRH (China Railway High-speed) high speed trains had been compared from the various technical aspects such as main circuit structures, MT ratio, DC link loop. Finally, some studies which should be carried out for the future are presented. © 2010 IEEE. Source


Lu H.,Tsinghua University | Sheng S.,Tsinghua University | Cheng X.,Eaton Corporation | Qu W.,Tsinghua University | And 2 more authors.
2011 International Conference on Electrical Machines and Systems, ICEMS 2011 | Year: 2011

In this paper, a segment phase-shifted carrier PWM method is proposed. According to the sector, the modulation wave can be discontinuous with different zero sequence signal injected and the carrier wave are phase shifted, which is different from conventional SVPWM. Using this technique, the peak-to-peak value of the common-mode voltage in one PWM cycle can be reduced to one third of the DC bus voltage at any speed, even despite of the dead-time effect. The good natural over modulation characteristic performance with high voltage utility is also researched. Furthermore, the technique can be generalized to obtain a series of PWM methods. Both theoretical and experimental results are presented to verify the validity of proposed technique. © 2011 IEEE. Source


Nian X.,Central South University | Ding R.,Zhuzhou Electrical Locomotive Research Institute | Wang J.,Zhuzhou Electrical Locomotive Research Institute | She D.,Central South University
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2012

This paper describes a model reference adaptive system (MRAS) for speed control of the induction motor drive (IM) without a speed sensor. In this scheme a new adaptive flux observer with a constant gain for speed estimation is presented. The theory of Lyapunov stability is used to design adaptive flux observers and speed estimators. The stability of flux observer is guaranteed by a linear matrix inequality (LMI), and the constant observer gain is obtained by solving the LMI with LMI toolbox in MATLAB. The problem of unstable region which arises from using pole-placement technique is overcome. Meanwhile, this paper also studies the resistance identification problem based on the adaptive observer. Based on the proposed approach of flux estimation, the sensorless direct torque control induction motor drive system is designed. The MATLAB simulation and experimental results show that the speed sensorless direct torque control IM drive system is capable of working from very low speed to high speed and shows good dynamic and steady-state performances. © 2012 Chinese Society for Electrical Engineering. Source


Lu H.,Tsinghua University | Sheng S.,Tsinghua University | Yu J.,Tsinghua University | Li Y.,Tsinghua University | And 2 more authors.
Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC | Year: 2012

The common-mode voltage (CMV) in voltage source inverter may seriously affect the motor drive system. It can be restrained with proper PWM method if only nonzero space vectors are used. In this paper, a nonzero vector PWM technique (NZPWM) is proposed. Using this method, three odd/even active vectors in low voltage region, or three adjacent active vectors in high voltage region, are used to build the reference voltage vector. So in the entire modulation index range, the peak-to-peak value of CMV can be reduced to one third of the traditional SVPWM, which is the minimum theoretically. Some simulation and experimental results will be presented, which show that the proposed method is effective in CMV reduction. © 2012 IEEE. Source

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