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Field weakening operation of a high torque density five phase permanent magnet motor drive

Field weakening operation of a high torque density five phas...

引用

2005 IEEE International Conference on Electric Machines and Drives

作者： Parsa, Leila Kim, Namhun Toliyat, Hamid A. IEEE Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY 12180-3590 Advanced Electric Machines and Power Electronics Lab. Department of Electrical Engineering Texas A and M University College Station TX 77843-3128

ISBN: (纸本)0780389875

This paper investigates the field weakening operation of a five-phase permanent magnet motor. The proposed motor has concentrated windings such that the produced back-EMF is almost trapezoidal. The motor is supplied with the combined sinusoidal plus third harmonic of currents. This motor, while generating the same average torque as an equivalent permanent magnet brushless dc motor, overcomes its disadvantages. It is shown that torque producing and flux producing components of current for this motor can be decoupled by using multiple reference frame transformation. Therefore, Vector control is easily applicable to the motor. Field weakening algorithm is derived and implemented. This motor benefits from high torque density of a BLDC motor below the rated speed and controllability of PMSM above the rated speed and during the field weakening region. Simulation and experimental results are provided to prove the validity of the superior performance of this drive © 2005 IEEE.

关键词： Permanent magnets

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Five-phase interior permanent magnet motor with low torque pulsation

Five-phase interior permanent magnet motor with low torque p...

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2005 IEEE Industry Applications Conference, 40th IAS Annual Meeting

作者： Parsa, Leila Toliyat, Hamid A. IEEE Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY 12180-3590 Advanced Electric Machines and Power Electronics Lab. Department of Electrical Engineering Texas A and M University College Station TX 77843-3128

ISBN: (纸本)0780392086

High torque pulsation is the major disadvantage of most IPM motor configurations. Choosing proper number of stator slots and winding distribution as well as increasing number of phases are among the possible solutions for reducing torque pulsation. In this paper, five-phase interior permanent magnet motor with fractional-slot stator is studied. It is shown that despite other IPM motors;the proposed five-phase IPM motor with fractional slot has a very low torque pulsation. For comparison purposes, a five-phase IPM motor with 20 stator slots which is a common configuration for four pole five-phase motors is also considered. It is shown that the torque pulsation of the proposed fractional-slot five-phase IPM motor is much lower than the five-phase IPM motor with 20 stator slots. Nonlinear finite element method is used to analyze different machine configuration. A prototype four pole, five-phase IPM motor with 15 stator slots has been built and is used for experimental verification. © 2005 IEEE.

关键词： Electric motors

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Five-phase permanent magnet motor drives for ship propulsion applications

Five-phase permanent magnet motor drives for ship propulsion...

引用

1st IEEE Electric Ship Technologies Symposium 2005

ISBN: (纸本)0780392590

Multi-phase machines are very good candidates for ship propulsion application. In this paper, first a literature survey on the work accomplished in the area of multi-phase, split-phase and dual stator machines will be presented. In the rest of the paper, additional degrees of freedom in multi-phase permanent magnet machines are employed to improve the overall performance of the system. Among all, the paper suggests and focuses on four significant features of multi-phase machines. First, the ability of injecting harmonic of currents in the motor and improving the torque production capability will be discussed. Second, better torque and flux adjustment in DTC controlled multi phase motor will be presented. Third, fault resilient current control of multi phase drive under loss of phases is examined. Finally the possibility of controlling multi motors through a single inverter is pointed out. The five phase permanent magnet motor is considered in this paper as an example. However the concept can be extended to higher number of phases. © 2005 IEEE.

关键词： Electric motors

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Co-modeling and co-simulation of package and on-chip decoupling capacitor for resonant free power/ground network design

Co-modeling and co-simulation of package and on-chip decoupl...

引用

55th Electronic Components and Technology Conference, ECTC

作者： Park, Hyunjeong Kim, Hyungsoo Kam, Dong Gun Kim, Joungho Terahertz Interconnection and Package Lab. Dept. of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology 373-1 Guseong-dong Yuseong-gu Daejeon 305-701 Korea Republic of

The co-modeling and co-simulation results about the package and on-chip power/ground network have been demonstrated. The inevitable parallel resonance peak, due to the inductive parasitic on the package and on-chip decoupling capacitor, was analyzed in frequency domain. Subsequently, the co-design procedure for the resonant free power/ground network was suggested and evaluated simply in frequency domain. © 2005 IEEE.

关键词： Capacitors

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Sensorless Vector Control of Single-Phase Induction Motor Drives

Sensorless Vector Control of Single-Phase Induction Motor Dr...

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2005国际电机与系统学术会议

作者： S.Vaez-Zadeh Sh.Reicy H. Advanced Motion System Lab. Dep. of Electrical and Computer Engineering Faculty of Engineering University of Tehran Tehran Iran IR Advanced Motion System Lab. Dep. of Electrical and Computer Engineering Faculty of Engineering University of Tehran Tehran Iran IR

SINGLE-PHASE Induction Motors (SPIMs) are being increasingly used in applications with variable speed requirement. A reliable motor speed signal is usually needed for speed control and advanced torque control in such applications. The use of a mechanical sensor for speed measurement is not a wise option because of its high cost relative to the motor *** this paper a speed estimation method is proposed for SPIMs using the rotor voltage vector defined in the complex domain. The estimated speed signal is then used in a novel sensorless vector control SPIM drive. Extensive simulation results validate the effectiveness of the proposed control system.

关键词： Index terms-Single-Phase Induction Motors, Vector control, Speed estimation, Sensorless control.

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Re-engineering software architecture of home service robots: A case study

Re-engineering software architecture of home service robots:...

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27th International Conference on Software engineering, ICSE 2005

作者： Kim, Moonzoo Lee, Jaejoon Kang, Kyo Chul Hong, Youngjin Bang, Seokwon Computer Science and Engineering Department Pohang University of Science and Technology Pohang Korea Republic of Interaction Lab. Samsung Advanced Institute of Technology P.O.Box 111 Suwon 440-600 Korea Republic of

With the advances of robotics, computer science, and other related areas, home service robots attract much attention from both academia and industry. Home service robots present interesting technical challenges to the community in that they have a wide range of potential applications, such as home security, patient caring, cleaning, etc., and that the services provided by the robots in each application area are being defined as markets are formed and, therefore, they change constantly. Without architectural considerations to address these challenges, robot manufacturers often focus on developing technical components (e.g., vision recognizer, speech processor, and actuator) and then attempt to develop service robots by integrating these components. When prototypes are developed for a new application, or when services are added, modified, or removed from existing robots, unexpected, undesirable, and often dangerous side-effects, which are known as feature interaction problem, happen frequently. Reengineering of such robots can make a serious impact in delivery time and development cost. In this paper, we present our experience of re-engineering a prototype of a home service robot developed by Samsung advanced Institute of Technology. First, we designed a modular and hierarchical software architecture that makes interaction among the components visible. With the visibility of interactions, we could assign functional responsibilities to each component clearly. Then, we re-engineered existing codes to conform to the new architecture using a reactive language Esterel. As a result, we could detect and solve feature interaction problems and alleviate the difficulty of adding or updating components. Copyright 2005 ACM.

关键词： Robots

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A realistic timing test model and its applications in high-speed interconnect devices

A realistic timing test model and its applications in high-s...

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作者： Wang, Baosheng Kuo, Andy Farahmand, Touraj Ivanov, André Cho, Yong B. Tabatabaei, Sassan SoC Laboratory University of British Columbia Canada Department of Electronics Engineering Konkuk University Seoul Korea Republic of Guide Technology Inc. Sunnyvale CA United States ATI Technologies Inc. Markham Ont. Canada Research Lab. Department of Electrical and Computer Engineering University of British Columbia Department of Electrical and Computer Engineering University of British Columbia IEEE Computer Society IEEE British Columbia Advanced Systems Institute Virage Logic Corporation

This paper extends the timing test model in [5] to be more realistic by including the effects of the test fixtures between a device under test and a tester. The paper enables analyzing the trade-offs that arise between the predicted yield and the required overall test environment timing accuracy (OTETA) which involves the tester overall timing accuracy (OTA) and the test fixtures' impacts. We specifically focus on the application of the extended model to predict the test yield of standard high-speed interconnects, such as PCI Express, Parallel/Serial RapidIO, and HyperTransport. The extended model reveals that achieving an actual yield of 80% with a test escape of 300 DPM (Defects Per Million) requires an equivalent OTETA that is about half the acceptable absolute limit of the tested parameter. © 2005 Springer Science + Business Media, Inc.

关键词： Scheduling

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Performance characterization of a 10-Gigabit Ethernet TOE

Performance characterization of a 10-Gigabit Ethernet TOE

引用

IEEE Symposium on High Performance Interconnects

作者： W. Feng P. Balaji C. Baron L.N. Bhuyan D.K. Panda Advanced Computing Lab Los Alamos National Laboratory USA Computer Science and Engineering Ohio State Uinversity USA Computer Science and Engineering University of California Riverside USA

Though traditional Ethernet based network architectures such as Gigabit Ethernet have suffered from a huge performance difference as compared to other high performance networks (e.g, InfiniBand, Quadrics, Myrinet), Ethernet has continued to be the most widely used network architecture today. This trend is mainly attributed to the low cost of the network components and their backward compatibility with the existing Ethernet infrastructure. With the advent of 10-Gigabit Ethernet and TCP offload engines (TOEs), whether this performance gap be bridged is an open question. In this paper, we present a detailed performance evaluation of the Chelsio T110 10-Gigabit Ethernet adapter with TOE. We have done performance evaluations in three broad categories: (i) detailed micro-benchmark performance evaluation at the sockets layer, (ii) performance evaluation of the message passing interface (MPI) stack atop the sockets interface, and (iii) application-level evaluations using the Apache Web server. Our experimental results demonstrate latency as low as 8.9 /spl mu/s and throughput of nearly 7.6 Gbps for these adapters. Further, we see an order-of-magnitude improvement in the performance of the Apache Web server while utilizing the TOE as compared to the basic 10-Gigabit Ethernet adapter without TOE.

关键词： Ethernet networks Costs Sockets Web server Delay Throughput Grid computing laboratories computer architecture Engines

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Tracking time-varying parameters in software systems with extended Kalman filters 05

Tracking time-varying parameters in software systems with ex...

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Proceedings of the 2005 conference of the Centre for advanced Studies on Collaborative research

作者： Tao Zheng Jinmei Yang Murray Woodside Marin Litoiu Gabriel Iszlai Dept. of Systems and Computer Engineering Carleton University Ottawa Centre for Advanced Studies IBM Toronto Lab Canada

Autonomic control of a service system can take advantage of a performance model only if a way can be found to track the changes in the system. A Kalman Filter provides a framework for integrating various kinds of measured data, and for tracking changes in any time-varying system. This work evaluates the effectiveness of such a filter in tracking changes in performance parameters of a software system that occur at different rates and amplitudes. The time-varying system is a Web application deployed in a data centre with layered queuing resources, in which parameter variations happen at random instants. The tracking filter is based on a layered queuing model of this system, with parameters representing CPU demands and the user load intensity. Experiments were performed to evaluate the effectiveness of the filter in tracking the changes, and the requirements for the filter settings for fast and slow variations in the parameters. The target application is autonomic control of a service centre.

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Image-based 3D face modeling system

Image-based 3D face modeling system

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作者： Park, In Kyu Zhang, Hui Vezhnevets, Vladimir School of Information and Communication Engineering Inha University 253 Younghyun-dong Nam-gu Incheon 402-751 Korea Republic of Computing Lab Samsung Advanced Institute of Technology San 14-1 Nongseo-ri Giheung-eup Yongin 449-712 Korea Republic of Graphics and Media Lab Department of Computational Mathematics and Cybernetics Moscow State University Moscow 119899 Russia School of Information and Communication Engineering Inha University Korea Republic of IEEE IEEE Computer Society ACM Samsung Advanced Institute of Technology Yongin Korea Republic of Graphics and Media Lab Computer Science Department Moscow State University

This paper describes an automatic system for 3D face modeling using frontal and profile images taken by an ordinary digital camera. The system consists of four subsystems including frontal feature detection, profile feature detection, shape deformation, and texture generation modules. The frontal and profile feature detection modules automatically extract the facial parts such as the eye, nose, mouth, and ear. The shape deformation module utilizes the detected features to deform the generic head mesh model such that the deformed model coincides with the detected features. A texture is created by combining the facial textures augmented from the input images and the synthesized texture and mapped onto the deformed generic head model. This paper provides a practical system for 3D face modeling, which is highly automated by aggregating, customizing, and optimizing a bunch of individual computer vision algorithms. The experimental results show a highly automated process of modeling, which is sufficiently robust to various imaging conditions. The whole model creation including all the optional manual corrections takes only 2-3 minutes. © 2005 Hindawi Publishing Corporation.

关键词： computer simulation

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