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Power Electronics, Machines and Drives, 2002. International Conference on (Conf. Publ. No. 487)

Date 2002

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Displaying Results 1 - 25 of 117
  • Dual gate lateral inversion layer emitter transistor

    Publication Year: 2002 , Page(s): 37 - 40
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (366 KB)  

    This paper describes the concept, fabrication and characterisation of a dual gate lateral inversion layer emitter transistor (DGLILET). Although the use of an inversion layer as an emitter was proposed by Udrea and Amaratunga (Proc. ISPSD'97, p. 305-308, 1997), this is the first report of a DGLILET using a p-type inversion layer. Compared with other work previously published on vertical (Huang, Solid-State Electron., vol. 38, no. 4, p. 829-838) and lateral devices (Hardikar et al, Proc. ISPSD'99, p 261-264, 1999; Chun, Proc. ISPSD'2000, p. 149-152, 2000), this device achieves a smooth I-V characteristic without trading off on-state against switching performance by minority carrier injection using a dynamic inversion layer. The device is particularly attractive for emerging high voltage integrated circuits where achieving a high current density with minimum losses is particularly important. View full abstract»

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  • New topology for hybrid multilevel inverter

    Publication Year: 2002 , Page(s): 211 - 216
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (403 KB)  

    A new topology for hybrid multilevel inverter is presented, which significantly increases the level number of output waveform and thereby dramatically reducing the low order harmonics and total harmonic distortion. To the best of the authors' knowledge, the presented topology has the greatest level number for a given number of stages. Moreover, the stage with higher DC-link voltage has less switching frequency, thereby reducing the switching losses. Comparison results of various multilevel inverters are investigated in this paper to reflect the merits of the presented new topology. The details of PWM control using harmonic elimination technique for the new hybrid inverter is presented and confirmed by both simulation and experimental results. View full abstract»

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  • Design optimisation of wide-speed permanent magnet synchronous motors

    Publication Year: 2002 , Page(s): 404 - 408
    Cited by:  Papers (6)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (359 KB)  

    A constant parameter equivalent circuit model that neglects motor losses is used to determine the effects of motor parameters and the inverter power ratings on the torque-speed characteristics over a wide speed range. Analytical models for the estimation of motor parameters based on the rotor geometries are set up. The optimisation of PMSM design is then conducted to meet the required motor parameters for the given torque-speed characteristics. View full abstract»

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  • Optimal controller design for high precision linear positioning systems based on permanent magnet synchronous motors

    Publication Year: 2002 , Page(s): 347 - 352
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (380 KB)  

    This paper is concerned with the application of permanent magnet synchronous motors to high accuracy, high speed linear positioning systems. A number of possible control strategies for this application are discussed. The state-space model in the d-q reference frame is developed for the motor, and the application of feedback linearisation to this problem is explained. An optimal control design methodology is then applied to the resulting linearised model. Simulated results of the design are presented. View full abstract»

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  • Variable frequency to constant frequency converter (VFCFC) for aircraft applications

    Publication Year: 2002 , Page(s): 235 - 240
    Cited by:  Papers (12)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (442 KB)  

    The simulation of a 20 kW VFCF converter for aircraft applications has been investigated using the SABER simulation tool. The results are compared with the international standard and are very encouraging. Experimental results have shown the THD spec requirements for the input and output stages were met. Furthermore the system responds well under transient conditions. From the input waveform it can be seen that there are high frequency pulses injected back from the VFCFC to the supply. These could be readily removed by connecting a high frequency filter to the input side. View full abstract»

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  • An integrated engine-generator set with power electronic interface for hybrid electric vehicle applications

    Publication Year: 2002 , Page(s): 153 - 158
    Cited by:  Papers (4)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (499 KB)  

    The paper describes the development and testing of a generator and power electronic interface for use with an IC engine in the auxiliary power unit (APU) of a series hybrid electric vehicle. The output of the permanent magnet generator is rectified and passed through a DC/DC buck converter before connection to the main DC bus bar. Such an arrangement allows the APU to be operated at variable speed and variable power so as to maximise engine efficiency. The tests show that the generator has an efficiency of just under 90% and the DC/DC buck converter and rectifier a combined efficiency of over 95%. The paper describes the generator and power electronic interface and the design interactions between the two. View full abstract»

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  • Modular fault-tolerant permanent magnet brushless machines

    Publication Year: 2002 , Page(s): 415 - 420
    Cited by:  Papers (17)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (419 KB)  

    The paper describes an analytical technique for determining all possible slot-number and pole-number combinations for modular permanent magnet brushless machines. It is shown that a large number of design variants exist. It is also shown that, for fault-tolerant modular machine designs, the adoption of a torque control strategy which minimizes the torque ripple under fault conditions may have a significant effect on the eddy current loss in the rotor permanent magnets. View full abstract»

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  • Feedback linearization sliding-mode torque control of an induction machine

    Publication Year: 2002 , Page(s): 110 - 115
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (414 KB)  

    In this work a high performance sliding-mode controller based on a feedback linearization control (SMC) system for PWM inverter-fed induction motor drives has been presented. The control performance under different operation conditions was compared to conventional field oriented control (RFO). The main features and advantages of the control system are summarised. It has been shown that both techniques can achieve high torque performance under certain operational conditions, and both have their particular advantages and disadvantages. The SMC scheme is disadvantaged due to the uncontrolled current transients and greater steady-state error. The RFO scheme is disadvantaged by greater parameter sensitivity and nonguaranteed decoupled control with transient flux dynamics. The selection of the controller will depend on the particular application. View full abstract»

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  • Extended ride-through capability for matrix converter drives with continuous motor synchronization

    Publication Year: 2002 , Page(s): 189 - 194
    Cited by:  Patents (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (433 KB)  

    To effectively ride through any voltage sag using a matrix converter adjustable speed drives requires a solution that exceeds conventional modulation techniques. Basically, the proposed strategy regulates the converter modulation index up to dynamic overmodulation if necessary, and secondly reduces the motor speed if the former action does not suffice. The key factor accomplished is to maintain full converter synchronization with the motor during the sag to provide immediate acceleration once the disturbance disappears. Further, a decision-making space vector modulation exhibiting minimum-processing load was developed to enhance the performance. The drive was experimentally verified under typical industry disturbances using a TMS320C32 DSP based system. Results obtained showed the effectiveness of the proposal for matrix converter adjustable speed drives. View full abstract»

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  • Influence of interbar currents on the harmonic losses and skew in cage induction machines

    Publication Year: 2002 , Page(s): 369 - 374
    Cited by:  Papers (11)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (380 KB)  

    This paper examines the influence of interbar currents in uninsulated cage rotors of induction motors. A previous paper by the authors developed a model for including interbar currents that reduces to a simple modification to the conventional chain equivalent circuit. This model is used to demonstrate that the locked rotor torque and full-load rotor losses can be particularly sensitive to the presence of interbar currents. The paper also explores the complex interaction between rotor skew and interbar current. View full abstract»

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  • The More Electric Aero-engine: a general overview from an engine manufacturer

    Publication Year: 2002 , Page(s): 246 - 251
    Cited by:  Papers (10)  |  Patents (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (362 KB)  

    This paper discusses the reasons for industry interest in More Electric Aircraft and More Electric Engines, describes the basic technologies that could be incorporated into a More Electric Engine and compares and contrasts a More Electric Engine with today's style of aircraft engine. Some ideas on how a More Electric Aircraft could be configured to make best use of the capabilities of such an engine are introduced. View full abstract»

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  • FEM analysis and optimisation design of an IPM synchronous motor

    Publication Year: 2002 , Page(s): 49 - 54
    Cited by:  Papers (24)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (475 KB)  

    In this paper, a parameter analysis of an interior permanent magnet (IPM) synchronous motor is presented. After some preliminary design considerations, based on an analytical model, the study is devoted to the evaluation of machine performance as main torque and torque ripple through finite element analysis. A validation of the calculation procedure is performed through experimental results on a prototype motor. An optimisation procedure based on genetic algorithms has been applied and the optimised configuration is presented. View full abstract»

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  • Transverse-flux permanent magnet (TFPM) machine with toothed rotor

    Publication Year: 2002 , Page(s): 309 - 314
    Cited by:  Papers (1)  |  Patents (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (500 KB)  

    The geometry of the transverse flux permanent magnet machine with toothed rotor is derived. This new machine geometry allows easy production and low mass of active material. Experiments on a linear actuator are presented in the paper. View full abstract»

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  • Full-digital predictive hysteresis current control for switching losses minimisation in PMSM drives

    Publication Year: 2002 , Page(s): 61 - 67
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (448 KB)  

    In this paper a novel hysteresis current control is proposed It is based on a simplified predictive algorithm that somewhat recalls those used in the direct torque control drives. The two major features are the sensible reduction of inverter switches commutations and the full-digital implementation based on look-up tables. The proposed algorithm has been implemented as inner loop of a speed control for a permanent magnet synchronous motor (PMSM). The result has been a low-cost, efficient and reliable PMSM drive, with good overall dynamic performance. The paper reports both simulation and experimental results, carried out on a laboratory prototype. View full abstract»

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  • Electrical design of high-speed induction motors of up to 15 MW and 20000 RPM

    Publication Year: 2002 , Page(s): 381 - 386
    Cited by:  Papers (4)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (496 KB)  

    This paper presents the electrical design of high-speed two-pole induction motors with a solid rotor cage design covering a power range of 2 to 15 MW with rotational speeds of up to 20,000 RPM. The electrical design and the underlying construction are explained, focusing on the rotor and on effects in high-speed motors related to the high basic supply frequency. Most modern calculation tools and procedures such as two-dimensional finite difference time-stepping calculations are used to predict the operational behaviour of the motor and to optimise the design. Based on these detailed simulations, simplified motor models are developed for the evaluation of design modifications as well as for daily design purposes. Finally, the calculation results are compared with test field measurements of a pilot unit with a power of 10 MW and a rotational speed of 12000 RPM. During an extensive testing period of 8 months the drive system was tested in the authors' test field under various conditions. Tests were made up to full speed and almost full load. The measured results show excellent correlation with both analytical and numerical simulations. The drive system has worked very satisfactory and the drive system as well as its components, high-speed motor and converter, have been validated. View full abstract»

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  • Permanent magnet brushless motors for industrial variable speed drives

    Publication Year: 2002 , Page(s): 650 - 654
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (460 KB)  

    The paper describes aspects of product design optimization and manufacturing technology development for PM brushless motor drives specific to industrial applications. Low speed direct drive motors with high specific torque have been built using a high polarity flux concentrating rotor design with radial ferrites. High efficiency and/or reduced size synchronous motors, rated at 1500 rpm and higher, have been built using NdFeB magnets. View full abstract»

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  • Power conditioning for solid oxide fuel cells

    Publication Year: 2002 , Page(s): 12 - 17
    Cited by:  Papers (7)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (507 KB)  

    Fuel Cells are regarded as a promising method for power generation in the future, offering reduced emissions and higher efficiency. The solid oxide fuel cell (SOFC) stands out as having, potentially, the highest conversion efficiency; however it also presents significant technical problems to realisation. The paper discusses the major issues in designing the power conversion for SOFCs, highlighting both the cause and a proposed method of solution. View full abstract»

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  • Computer based calculation procedures for the development of DC-motors

    Publication Year: 2002 , Page(s): 255 - 259
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (403 KB)  

    To fulfil the high dynamic market requirements the DC-motor has to be optimized by employing design calculation methods which yield high quality results in a short time. The presented paper summarizes new calculation procedures and shows their application in a practical example. A comparison between experimental results and simulations complete this presentation. View full abstract»

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  • Analysis of peak torque of line-operated synchronous machines subjected to symmetrical voltage sags

    Publication Year: 2002 , Page(s): 480 - 485
    Cited by:  Papers (4)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (424 KB)  

    Voltage sags and voltage interruptions are serious power quality problems for many industries. Apart from eventual tripping, voltage sags cause high torque peaks, which may cause damage to the shaft or equipment connected to the shaft. This paper shows how the torque depends on both the duration and the magnitude of voltage sags. First a simple theory is presented, and then to verify the theory, simulations of a blast furnace blower located at the steel plant SSAB Oxelosund Sweden are performed. A line operated salient-pole synchronous machine powers the blower, which feeds the blast furnace with air. The conclusion is that voltage sags with durations equal to multiples of a whole cycle generate minimum torque. peaks, and the maximum torque peaks are generated by voltage sags with durations equal to multiples of a whole cycle plus half a cycle. View full abstract»

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  • Using genetic algorithms in design optimization of the flux switching motor

    Publication Year: 2002 , Page(s): 540 - 545
    Cited by:  Papers (10)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (414 KB)  

    Optimisation of the lamination shape of a reluctance machine such as the flux switching motor is a multidimensional problem. Genetic algorithms have been shown to be well suited to optimization of various electrical machines and this paper describes the design and implementation of a genetic algorithm based optimisation system for a flux switching motor. Benefits of employing computer-automated design over the traditional design method are illustrated. An outline of the computer implementation of the FSM design and optimisation procedure using genetic algorithms is presented. A revised lamination design showing improved performance over an existing design is presented. View full abstract»

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  • Tubular linear motors: a comparison of brushless PM and SR motors

    Publication Year: 2002 , Page(s): 626 - 631
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (411 KB)  

    The aim of this paper is to compare tubular linear motors of brushless permanent magnet type and switched reluctance type in terms of their electromechanical construction and the static force production capability. The comparison of the force per volume ratio is made for fixed external diameter and rated dissipation. View full abstract»

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  • High torque machines for power hand tool applications

    Publication Year: 2002 , Page(s): 644 - 649
    Cited by:  Papers (5)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (432 KB)  

    Power hand tool applications typically require a high output torque at modest speed. The product must be light, small and ergonomically designed. Forced air cooled DC motors or universal motors are typically used in combination with a step down gear box to achieve the required torque. This paper reports on some research which is seeking to produce better systems by producing very high torque density electrical machines. The work has sought to achieve this by using a combination of new materials, including both rare earth magnets and powdered iron, and novel topologies of machine. Two machines have been built: one uses conventional laminated construction for a radial field machine, the other uses powdered iron for a claw pole armature machine. Both machines contain a number of novel features; this paper gives the rationale behind each design and comprehensive test results thereby comparing their performance. View full abstract»

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  • Implementation of online air-gap torque monitor for detection of squirrel cage rotor faults using TMS320C31

    Publication Year: 2002 , Page(s): 128 - 132
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (358 KB)  

    This paper proposes a digital signal processor (DSP) based implementation of online air-gap torque estimator for detection of squirrel cage rotor faults. Two noninvasive, computationally efficient methods for online air-gap torque monitoring are discussed. In both the methods, the air-gap torque is computed from two stator voltages and currents and is cost effective when compared with the use of a conventional torque transducer. The online air-gap torque monitor has been implemented using TMS320C31 and successfully tested on faulty cage rotors. View full abstract»

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  • An AC self-bearing rotating machine with a single set of windings

    Publication Year: 2002 , Page(s): 292 - 297
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (431 KB)  

    A self-bearing motor is an integrated device that possesses magnetic bearing capability in addition to the normal torque-producing function. Conventional self-bearing motors have a poor specific power rating and require a high number of power electronic switches. These disadvantages arise from the manner in which the windings are connected. This paper outlines an approach to the realisation of self-bearing motors using a single set of windings with advantages such as: relatively low RMS power loss for a given performance; requiring only one standard power supply for torque production and additional supplies of low current and voltage ratings for the production of lateral force; and preserving the flexibility for extensions to other polyphase machines. Coupled field finite elements simulations are performed to verify this new connection scheme. View full abstract»

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  • Mechanical behaviour of Roebel bar conductors in case of short circuit conditions of electric power generators

    Publication Year: 2002 , Page(s): 592 - 597
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (424 KB)  

    The necessary slot wedge fixing of Roebel bars in dependence of multiple rated electrical current is calculated both in numerical and analytical ways. Characteristic mechanical stress peaks inside the material structure obtained from the numerical calculations are compared with the values of analytic solutions. All investigations are carried out for several typically used industrial material compositions. View full abstract»

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