中国电工技术学会活动专区
CES Conference
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中国电工技术学会活动专区 CES Conference   CES TEMS 《中国电工技术学会电机与系统学报（英文）》（CES TEMS）是中国电工技术学会和中国科学院电工研究所共同主办、IEEE PELS学会技术支持的英文学术期刊。期刊发表国内外有关高性能电机系统、电机驱动、电力电子、可再生能源系统、电气化交通等研发及应用领域中原创、前沿学术论文。中国工程院院士马伟明担任主编，IEEE执委Don Tan博士担任国际主编。 Message from EditorsDeputy Editor-in-Chief：Professor Taeuk JUNG Guest Editor：Donghee Lee, Dokwan Hong；Seonhwan Hwang, Jaesuk Lee Multi-layer Quasi Three-dimensional Equivalent Model of Axial-Flux Permanent Magnet Synchronous MachineAuthors：Mingjie He, Weiye Li, Jun Peng, and Jiangtao Yang Abstract：Axial-flux permanent magnet synchronous machine (AFPMSM) enjoys the merits of high torque density and high efficiency, which make it one good candidate in the direct-drive application. The AFPMSM is usually analyzed based on the three-dimensional finite element method (3D FEM) due to its three-dimensional magnetic field distribution. However, the 3D FEM suffers large amount of calculation, time-consuming and is not suitable for the optimization of AFPMSM. Addressing this issue, a multi-layer quasi three-dimensional equivalent model of the AFPMSM is investigated in this paper, which could take the end leakage into consideration. Firstly, the multi-layer quasi three-dimensional equivalent model of the AFPMSM with single stator and single rotor is derived in details, including the equivalent processes and conversions of structure dimensions, motion conditions and electromagnetic parameters. Then, to consider the influence of end leakage on the performance, a correction factor is introduced in the multi-layer quasi three-dimensional equivalent model. Finally, the proposed multi-layer quasi three-dimensional equivalent model is verified by the 3D FEM based on an AFPMSM under different structure parameters. It demonstrates that the errors of flux linkage and average torque obtained by the multi-layer quasi three-dimensional equivalent model and 3D FEM are only around 2% although the structure parameters of the AFPMSM are varied. Besides, the computation time of one case based on the multi-layer quasi three-dimensional equivalent model is only 6 min, which is much less than that of the 3D FEM, 1.8 h, under the same conditions. Thus, the proposed multi-layer quasi three-dimensional equivalent model could be used to optimize the AFPMSM and much time could be saved by this method compared with the 3D FEM. Torque Ripple Reduction of Synchronous Reluctance Machine by Using Asymmetrical Barriers and Hybrid Magnetic CoreAuthors：Chengcheng Liu, Member, IEEE, Kelin Wang, Shaopeng Wang, Youhua Wang, and Jianguo Zhu, Senior Member, IEEE Abstract：As there is no need of permanent magnet (PM) material and only silicon steel sheet required on the rotor, synchronous reluctance machine (SynRM) can be used for many applications and draws a great research interest. For the SynRM, the torque ripple is a big issue and a great of work could been done on reducing it. In this paper, asymmetrical magnetic flux barriers in the SynRM rotor were studied comprehensively, including angle and width of each layer and each side of the magnetic barrier. The SynRMb with asymmetrical and parallel magnetic flux barrier was found as the best way to design SynRM based on the multi-objective design optimization method. Moreover, each parameter was studied to show the design rule of the asymmetrical magnetic flux barrier. As the average torque will be reduced with the asymmetrical barrier is used, the grain-oriented silicon steel is used on stator teeth of the SynRMb (SynRMbG) was proposed and studied. The analysis results show that the proposed new method can make the SynRM have better performance. Design and Optimization of a Mechanical Variable-Leakage-Flux Interior Permanent Magnet Machine with Auxiliary Rotatable Magnetic PolesAuthors：Tongze Sun, Xiping Liu, Yongling Zou, Chaozhi Huang, and Jianwei Liang Abstract：A novel mechanical variable-leakage-flux interior permanent magnet machine (MVLF-IPMM) is proposed for electric vehicles (EVs) in this paper, which employs a mechanical flux-regulating device and auxiliary rotatable magnetic poles. The magnetic poles acting as the flux adjustors can be rotated by the additional device to vary the leakage flux in magnetic circuit and realize the adjustment of the PM flux linkage. Due to the flux-regulating effect, the flux distribution in this machine is complex and changeable. Therefore, the working principle is illustrated in detail. To obtain the perfect coordination between the dominant magnetic poles and auxiliary magnetic poles, a multi-objective optimization method is presented based on the parameter sensitivity analysis combining with the Coefficient of Prognosis (CoP). Then, some design parameters with strong sensitive are selected by the sensitivity analysis and the initial model of the proposed motor is optimized by utilizing the multi-objective genetic algorithm (MOGA). According to the result of the optimization, the machine performances of the initial and the optimal design under the different flux states are compared and analyzed to verify the validity of the new variable-flux motor and the optimization method. Multi-Objective Optimization of High Torque Density Segmented PM Consequent Pole Flux Switching Machine with Flux BridgeAuthors：Wasiq Ullah, Studnet member, IEEE, Faisal Khan, Member, IEEE, and Muhammad Umair Abstract：Due to double salient structure, Flux Switching Machines (FSMs) are preferred for brushless AC high speed applications. Permanent Magnet (PM) FSMs (PM-FSMs) are suited applicants where high torque density (Tden) and power density (Pden) are the utmost requisite. However conventional PM-FSMs utilizes excessive rare earth PM volume VPM, higher cogging torque Tcog, high torque ripples (Trip) and comparatively lower (Tden) and Pden due to flux leakage. To overcome the aforesaid demerits, a new high (Tden) Segmented PM Consequent Pole (CP) FSM (SPMCPFSM) with flux bridge and barrier is proposed which successfully reduces VPM by 46.52% and PM cost by 46.48%. Moreover, Multi-Objective Optimization (MOO) examines electromagnetic performance due to variation in geometric parameters for global optimum parameters with key metric such as flux linkage (Φpp), flux harmonics (ΦTHD) average torque (Tavg), Tcog, Trip, Tden, average power (Pavg) and Pden. Analysis reveals that MOO improve Φpp by 22.68%, boost Tavg by 11.41%, enhanced Pavg by 4.55% and increased Tden and Pden by 11.41%. Detailed electromagnetic performance comparison with existing state of the art shows that proposed SPMCPFSM offer Tavg maximum up to 88.8%, truncate Trip up to 24.8%, suppress Tcog up to 22.74%, and results 2.45 times Tden and Pden. PSO Based Controlled Six-phase Grid Connected Induction Generator for Wind Energy GenerationAuthors：Arif Iqbal, Member, IEEE, and Girish Kumar Singh Abstract：This paper deals a detailed performance investigation of asymmetrical six-phase grid connected induction generator (GCIG) in two proposed configurations in variable speed operation. During the system development, regulation of DC-link voltage has been proposed using particle swarm optimization (PSO) based PI controller, ensuring the power flow to utility grid through back to back converters. The closed loop operation of asymmetrical six-phase GCIG using indirect field oriented control in different configurations has been carried out in Matlab/Simulink environment. Analytical results have been verified using real time test results on virtual platform of Typhoon HIL supported with some experimental validation. Study on Magnetic Shielding for Performance Improvement of Axial-Field Dual-Rotor Segmented Switched Reluctance MachineAuthors：Wei Sun, Student Member, IEEE, Qiang Li, Le Sun, Member, IEEE, and Xuefeng Jiang, Member, IEEE Abstract：A category of permanent-magnet-shield (PM-shield) axial-field dual-rotor segmented switched reluctance machines (ADS-SRMs) are presented in this paper. These topologies are featured by using the magnetic material to shield the flux leakage in the stator and rotor parts. Besides, the deployed magnets weaken the magnetic saturation in the iron core, thus increasing the main flux. Hence, the torque-production capability can be increased effectively. All the PM-shield topologies are proposed and designed based on the magnetic equivalent circuit (MEC) model of ADS-SRM, which is the original design deploying no magnet. The features of all the PM-shield topologies are compared with the original design in terms of the magnetic field distributions, flux linkages, phase inductances, torque components, and followed by their motion-coupled analyses on the torque-production capabilities, copper losses, and efficiencies. Considering the cost reduction and the stable ferrite-magnet supply, an alternative proposal using the ferrite magnets is applied to the magnetic shielding. The magnet demagnetization analysis incorporated with the thermal behavior is performed for further verification of the motor performance. Research on Fault-tolerant Operation Strategy of Rectifier of Square Wave Motor in Wind Power SystemAuthors：Chunyuan Bian, Shangyue Liu, Haiyang Xing, and Yulong Jia Abstract：In wind power system, the randomness of wind energy increases the probability of components fault. once the switch fault of the PWM rectifier is detected, it will lead to the distortion of the motor voltage and current waveform, the increase of torque ripple, the fluctuation of filter capacitor voltage, and the increase of harmonic content, which will affect the control performance and operation safety of the system. A common fault in a three-phase PWM rectifier is the open-circuit fault of the switch. This paper analyzes the current waveform distortion of the square wave motor when the rectifier switch fault, and proposes different fault-tolerant control strategies for different situations of switch fault, include single, double and triple switches fault. This method is based on several special driving modes under power generation situation of square wave motor. The strategy is easy to implement and does not need to change the circuit topology. It can realize fault-tolerant control of switch faults in the same side half bridge or the same bridge arm of the three-phase PWM rectifier. The effectiveness of the proposed fault-tolerant strategy is verified by simulation and experiment at the end of the article. Synchronous VibrationSuppression of Magnetic Bearing Systems without Angular SensorsAuthors：Hongbo Sun,Student Member, IEEE,Dong Jiang, SeniorMember,IEEE,andJichang Yang Abstract：Active Magnetic Bearing (AMB) levitates rotor by magnetic force without friction, and it can provide active control force to suppress vibration while rotating. Most of vibration suppressing methodsneed angular speed sensors to obtain rotating speed, but in many occasions, angular speed sensor is difficult to install or is difficult to guarantee reliability. This paper proposed a vibration suppressing strategy without angular speed sensor based on generalized integrator and frequency locked loop (GI-FLL) and phase shift generalized integrator (PSGI). GI-FLLand high-pass filter estimate frequency from control current, PSGI is applied to generate compensating signal. Firstly, model of AMB system expressed by transfer function is established and effect of centrifugal force is analyzed. Then, principle and process of vibration suppressing strategy is introduced. Influence of parameters are analyzed by root locus and bode diagram. Simulation results display the process of frequency estimation and performance of displacement. Experiments are carried on a testrig, results of simulations and experiments demonstrate the effectiveness of proposed vibration suppressing strategy. |
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