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Journal of international Conference on Electrical Machines and Systems
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Journal of International Conference on Electrical Machines and Systems
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Volume & Issues
Volume 3, Issue 4 - Dec 2014
Volume 3, Issue 3 - Sep 2014
Volume 3, Issue 2 - Jun 2014
Volume 3, Issue 1 - Mar 2014
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Sensorless Control of Brushless DC Motors based on TMS320F2812
Wu, Ziyu ; Wang, Haifeng ;
Journal of international Conference on Electrical Machines and Systems , volume 3, issue 1, 2014, Pages 1~6
DOI : 10.11142/jicems.2014.3.1.1
A new sensorless control strategy for brushless DC (BLDC) motors is proposed in this paper. This technique builds a rotor position-related flux function, which is independent of the speed. By observing the flux function, the information of rotor position and commutation can be obtained. As the function is not speed-related, this control process can be used in a wider range of speed and improves the motor's performance during startup. An experimental test bad based on TMS320F2812 has been built, and the experimental result indicates that the motor achieves a smooth starting-up and stable phase commutation with the proposed control strategy.
Transient Simulation Studies of Squirrel-Cage Induction Motor Directly Supplied with Aircraft Variable Frequency Power
Du, Xiaofei ; Wang, Deqiang ; Zhou, Yuanjun ;
Journal of international Conference on Electrical Machines and Systems , volume 3, issue 1, 2014, Pages 7~14
DOI : 10.11142/jicems.2014.3.1.7
Aircraft variable frequency power and a new application of induction motor under the aero-power are introduced. The transient models and simulation of induction motor are reviewed. A new transient model and simulation method is presented that includes deep-bar effect and magnetic saturation. Dynamic magnetizing inductance, rotor resistance and leakage reactance are considered as varying parameters in state-space model. Base on known rotor structure and speed, these parameters can be calculated.
Inner Evaporative Cooling Wind Power Generator with Non-overlapping Concentrated Windings
Li, Wang ; Wang, Haifeng ;
Journal of international Conference on Electrical Machines and Systems , volume 3, issue 1, 2014, Pages 15~19
DOI : 10.11142/jicems.2014.3.1.15
As the space of the wind power generator stator end is limited, it is difficult for us to place the inner evaporative cooling system in it. We use the non-overlapping concentrated windings scheme to solve the placing and cooling problem. The characteristic of a 5MW direct-driven permanent magnet generator with non-overlapping concentrated windings were analyzed under no-load, rating-load and short-circuit by (Finite Element Method) FEM for verification of design. We studied the connection methods of the stator windings and designed the end connection member. The heat dissipation of the stator end was simulated by FEM, the result showed that the end cooling could satisfy the wind generator operation needs. These results show that the direct-driven permanent magnet wind power generators with non-overlapping concentrated windings and inner evaporative cooling system can solve the cooling problem of wind power generator, and obtain good performance at the same time.
Harmonic Winding Factors and MMF Analysis for Five-phase Fractional-slot Concentrated Winding PMSM
Kang, Huilin ; Zhou, Libing ; Wang, Jin ;
Journal of international Conference on Electrical Machines and Systems , volume 3, issue 1, 2014, Pages 20~26
DOI : 10.11142/jicems.2014.3.1.20
To enhance torque density by harmonic current injection, optimal slot/pole combinations for five-phase permanent magnet synchronous motors (PMSM) with fractional-slot concentrated windings (FSCW) are chosen. The synchronous and the third harmonic winding factors are calculated for a series of slot/pole combinations. Two five-phase PMSM, with general FSCW (GFSCW) and modular stator FSCW (MFSCW), are analyzed and compared in detail, including the stator structures, star of slots diagrams, and MMF harmonic analysis based on the winding function theory. The analytical results are verified by finite element method, the torque characteristics and phase back-EMF are also taken into considerations. Results show that the MFSCW PMSM can produce higher average torque, while characterized by more MMF harmonic contents and larger ripple torque.
Investigation on Stray Magnetic Field of High-Speed Maglev
Sun, Yan ; Lee, Chang-Young ; Jo, Jeong-Min ; Lee, Jin-Ho ; Han, Young-Jae ;
Journal of international Conference on Electrical Machines and Systems , volume 3, issue 1, 2014, Pages 27~31
DOI : 10.11142/jicems.2014.3.1.27
Magnetic fields (MF) generated both on board the vehicle and along the guideway provide levitation and propulsion forces. High speed maglev trains adopt electromagnet or superconducting magnet to realize levitation and propulsion functions. However, stray fields existing in passenger compartment and regions surrounding the vehicle and guideway have effect on passengers and environment. To investigate stray magnetic field effect, model of Transrapid and MLX are studied.
Modelling and Optimal Design of a Ring-type Structure for the Generation of a Traveling Wave
Liu, Xinchang ; Civet, Yoan ; Perriard, Yves ;
Journal of international Conference on Electrical Machines and Systems , volume 3, issue 1, 2014, Pages 32~39
DOI : 10.11142/jicems.2014.3.1.32
Traveling wave generation in a ring type stator has been studied. The basic working principle to create traveling wave has been modelled by the superposition of two orthogonal standing waves. Theoretical analysis shows that the length to radius ratio affects the frequency gap between two pseudo orthogonal modes used to create traveling wave. FEM simulation is then discussed and applied to validate the analytical model. At last, a possible optimal solution is reported with FEM verification.
Sinusoidal Back-EMF of Vernier Permanent Magnet Machines
Li, Dawei ; Qu, Ronghai ;
Journal of international Conference on Electrical Machines and Systems , volume 3, issue 1, 2014, Pages 40~47
DOI : 10.11142/jicems.2014.3.1.40
Sinusoidal back-EMF waveform of vernier Permanent Magnet (PM) machines is analyzed in this paper. An analytical expression of Electromotive Force (EMF) of electric machines including vernier machines is developed to analyze EMF harmonics, and the effect of vernier PM machine pole ratio, the ratio of number of rotor poles to stator poles, on the EMF waveform. Moreover, this paper represents several Finite Element Analysis (FEA) models to verify the analysis based on the proposed expression, and the effect of tooth width ratio, which is the ratio of tooth width to tooth pitch, on back-EMF of vernier PM machines, and optimal tooth width ratio is obtained and verified by FEA. Finally, this paper makes comparisons between EMF waveform of vernier PM machines and that of traditional PM machines from the point of view of analytical EMF expression.
Project Summary of Three Gorges' 840MVA Hydro-generator with Close-Loop-Self-Circulating Evaporative Cooling System
Yuan, Jiayi ; Meng, Dawei ; Gu, Guobiao ; Song, Fuchuan ; Zhang, Tianpeng ;
Journal of international Conference on Electrical Machines and Systems , volume 3, issue 1, 2014, Pages 48~53
DOI : 10.11142/jicems.2014.3.1.48
In December 2011 and July 2012, two sets of 840MVA hydro-generator of Three Gorges on Yangtze River with Close-loop-self-circulating evaporative cooling (CLSCEC) system were put into commercial operation. In this paper, we make engineering summary of these two generators with CLSCEC system. We also make a comparison between the internal water cooling (IWC) hydro-generator and the CLSCEC hydro-generator used in Three Gorges power plant in fields of their operating characteristics, working performances, technical features, working safety and reliability. In addition, engineering structures, type tests' results and systematic emulating calculation of CLSCEC schemes are analyzed.
Simple Equivalent Circuit for Efficiency Calculation of Brushless DC Motors
Ishikawa, Takeo ; Tsuji, Takuma ; Hashimoto, Seiji ; Kurita, Nobuyuki ;
Journal of international Conference on Electrical Machines and Systems , volume 3, issue 1, 2014, Pages 54~60
DOI : 10.11142/jicems.2014.3.1.54
This paper shows a calculation method of several types of loss and the efficiency of brushless DC motors coupled with a load system by using a simple equivalent circuit, in which copper loss, eddy current loss, hysteresis loss, friction loss, viscous loss, and inverter loss are taken into account. We clarify each loss and motor efficiency at different motor speeds and different output torques by using the Microsoft-Excel. Moreover, the calculated results are in good agreement with the measured ones.
Research about the Evaporative Cooling Sleeve of 3.6 MW Wind Generator Stator
Yu, Shunzhou ; Yang, Jie ; Yuan, Jiayi ; Tian, Xindong ;
Journal of international Conference on Electrical Machines and Systems , volume 3, issue 1, 2014, Pages 61~66
DOI : 10.11142/jicems.2014.3.1.61
The evaporative cooling technology used in Wind generator stator has unique advantages. Combined with the structure of motor stator and operating conditions, this report based on the research project for the evaporative cooling sleeve of the 3.6MW wind generator, introduces the material requirements and structural characteristics of the sleeve, simulates on the stress, displacement and stability by finite analysis method, and tests the products experimentally. The research results show that the epoxy resin-glass materials have a higher strength and better insulation properties, but the evaporative cooling of the wind generator stator sleeve, because of its thin-walled, and the external pressure, so it's the less rigid. Should make full use of the motor stator core structure, increase its stiffness and improve the stability of the epoxy resin-glass sleeve, which for thin-walled the epoxy resinglass sleeve on the successful application of wind turbines has played an important role.
Research of Novel Water Cooling Jacket for Explosion-proof Motor
Wang, Yu ; He, Huiming ; Bai, Baodong ;
Journal of international Conference on Electrical Machines and Systems , volume 3, issue 1, 2014, Pages 67~71
DOI : 10.11142/jicems.2014.3.1.67
The well tightness of the coal mining water-cooling explosion-proof motor results in difficult heat dissipation, high hydraulic pressure is needed to increase the cooling effect. However, high hydraulic pressure may lead motor shell to deform, which makes it difficult to change the motor and maintain the motor unit. The method of adding keyhole caulk weld spots on the outer cooling water jacket was proposed to solve the problem. Based on the elasticity mechanics equations and the principle of finite element method the stresses and the deformations of the traditional and novel outer cooling water jacket were calculated separately. A hydraulic pressure experiment of the both cooling water jackets was constructed. Obviously, the stress and the deformation of the novel cooling water jacket are lower. The experimental result is consistent with the simulation results. It is effective to reduce the stress and the deformation of the cooling water jacket by adding the keyhole caulk weld spots.
Practical Design Considerations for Large PM Machines
Qu, Ronghai ; Zhang, Xiaolong ;
Journal of international Conference on Electrical Machines and Systems , volume 3, issue 1, 2014, Pages 72~77
DOI : 10.11142/jicems.2014.3.1.72
To help machine designers to make precise design of large permanent magnet (PM) machines, this paper presents a set of design considerations that are very often ignored by machine designers. These considerations are categorized into several aspects: electromagnetic (EM) performance, losses and efficiency, fault and stability, and some other issues. The effects of various practical factors are presented and some corresponding design methods are introduced.
Multi-Secondary Transformer: A Modeling Technique for Simulation - II
Patel, A. ; Singh, N.P. ; Gupta, L.N. ; Raval, B. ; Oza, K. ; Thakar, A. ; Parmar, D. ; Dhola, H. ; Dave, R. ; Gupta, V. ; Gajjar, S. ; Patel, P.J. ; Baruah, U.K. ;
Journal of international Conference on Electrical Machines and Systems , volume 3, issue 1, 2014, Pages 78~82
DOI : 10.11142/jicems.2014.3.1.78
Power Transformers with more than one secondary winding are not uncommon in industrial applications. But new classes of applications where very large number of independent secondaries are used are becoming popular in controlled converters for medium and high voltage applications. Cascade H-bridge medium voltage drives and Pulse Step Modulation (PSM) based high voltage power supplies are such applications. Regulated high voltage power supplies (Fig. 1) with 35-100 kV, 5-10 MW output range with very fast dynamics (
order) uses such transformers. Such power supplies are widely used in fusion research. Here series connection of isolated voltage sources with conventional switching semiconductor devices is achieved by large number of separate transformers or by single unit of multi-secondary transformer. Naturally, a transformer having numbers of secondary windings (~40) on single core is the preferred solution due to space and cost considerations. For design and simulation analysis of such a power supply, the model of a multi-secondary transformer poses special problem to any circuit analysis software as many simulation softwares provide transformer models with limited number (3-6) of secondary windings. Multi-Secondary transformer models with 3 different schemes are available. A comparison of test results from a practical Multi-secondary transformer with a simulation model using magnetic component is found to describe the behavior closer to observed test results. Earlier models assumed magnetising inductance in a linear loss less core model although in actual it is saturable core made-up of CRGO steel laminations. This article discusses a more detailed representation of flux coupled magnetic model with saturable core properties to simulate actual transformers very close to its observed parameters in test and actual usage.
Magnetic Field Analysis of Wireless Power Transfer via Magnetic Resonant Coupling or Electric Vehicle
Kesamaru, Katsumi ;
Journal of international Conference on Electrical Machines and Systems , volume 3, issue 1, 2014, Pages 83~87
DOI : 10.11142/jicems.2014.3.1.83
This paper describes the magnetic field analysis of wireless power transfer via magnetic resonant coupling. The wireless power transfer system for supplying power to electric vehicle is developed. The parameters of coil transfer system are simulated by the finite element method (FEM). Therefore the coil structure of power transfer system can be accurately analyzed. This paper deals with 3kW wireless transfer system.
Maximum-Power-Point Tracking Using Multiphase Interleaved Converters Based on Multi-Unit Synchronization
Jantharamin, Niphat ; Thongbuaban, Ponlawat ;
Journal of international Conference on Electrical Machines and Systems , volume 3, issue 1, 2014, Pages 88~92
DOI : 10.11142/jicems.2014.3.1.88
This paper presents an application of a multiphase interleaved converter in tracking maximum power points (MPPs) of a photovoltaic (PV) panel regardless of environmental variations. Maximum power from the panel was extracted by means of the well-known the perturb-and-observe (P&O) method. The switching control technique used an interleaving scheme based on multi-unit synchronization. The converter performed harmonic attenuation without affecting the tracking speed. This approach is straightforward, reliable and inexpensive, and could be applied to any higher number of switching cells without difficulty.
Study of Large Wind Power Generator with Evaporative Cooling System
Wang, Haifeng ; Li, Wang ; Guo, Hui ; Yang, Jie ; Gu, Guobiao ;
Journal of international Conference on Electrical Machines and Systems , volume 3, issue 1, 2014, Pages 93~97
DOI : 10.11142/jicems.2014.3.1.93
Evaporative cooling system has the advantage of high cooling performance, good insulation properties, less electrical fault, easy to maintain and high reliability, can meet the requirements of the cooling system in wind power generators. Based on a large number of theoretical researches and engineering practices, we had a comprehensive study of evaporative cooling wind power generator. Studies show that evaporative cooling system has advantage as the cooling system of wind power generator.
Performance Analysis of a Sliding Mode Control for Distributed Generations
Islam, Gazi ; Al-Durra, Ahmed ; Muyeen, S.M. ; Caruna, Cedric ; Tamura, Junji ;
Journal of international Conference on Electrical Machines and Systems , volume 3, issue 1, 2014, Pages 98~104
DOI : 10.11142/jicems.2014.3.1.98
This paper presents the performance analysis of a sliding mode based hybrid controller for three phase voltage source inverter. The main objective of this analysis is to observe the effectiveness of the controller for fault ride through (FRT) capability improvement of the distributed generations (DG). The performance of the conventional PI based cascaded controller is also presented for comparison purpose.
Application of Evaporative Cooling Technology in HDVC Converter Station
Guo, Jianhong ; Wang, Haifeng ; Ai, Chengliu ; Gu, Guobiao ;
Journal of international Conference on Electrical Machines and Systems , volume 3, issue 1, 2014, Pages 105~109
DOI : 10.11142/jicems.2014.3.1.105
Converter valve cooling device as the heat exchanger, is known as the converter valve's blood circulation system, Inefficiency of the equipment will not only lead to the component overheating damage, but also serious DC system outage. Therefore, reliable HVDC valve cooling system is essential for the HVDC transmission system. In this article, analysis on the two-phase flow heat transfer characteristics and security of the evaporative cooling technology are provided, the technology's advantage and feasibility are discussed.