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Conference Record of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No.02CH37344)最新文献

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Digital field oriented control for dual three-phase induction motor drives 双三相感应电动机驱动的数字磁场定向控制
R. Bojoi, M. Lazzari, F. Profumo, A. Tenconi
A direct rotor field oriented control (DRFOC) of a dual-three phase induction motor drive is described in this paper. The induction machine has two sets of stator three-phase windings spatially shifted by 30 electrical degrees. The stator windings are fed by a current controlled PWM (CRPWM) six-phase voltage source inverter (VSI). Three key issues are discussed: (1) the machine dynamic model is based on the vector space decomposition theory; (2) the PWM strategy uses the double zero-sequence injection modulation technique which gives good results with low computational and hardware requirements; and (3) to eliminate the inherent asymmetries of the drive power section, a new current control scheme is proposed. Experimental results are presented for a 10 kW dual three-phase induction motor drive prototype.
介绍了一种双三相异步电动机驱动的直接转子磁场定向控制方法。感应电机有两组定子三相绕组,空间位移30度。定子绕组由电流控制PWM (CRPWM)六相电压源逆变器(VSI)馈电。讨论了三个关键问题:(1)基于向量空间分解理论的机器动力学模型;(2) PWM策略采用双零序注入调制技术,计算量和硬件要求低,效果好;(3)为了消除驱动电源部分固有的不对称性,提出了一种新的电流控制方案。介绍了10kw双三相感应电动机驱动样机的实验结果。
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引用次数: 324
GaN power switching device growth by plasma assisted molecular beam epitaxy 等离子体辅助分子束外延生长GaN功率开关器件
C. Park, P. Chapman, S. Rhee, S. J. Hong, X. Zhang, P. Krein, K. Kim
Newly fabricated junction field effect transistors (JFETs) and high electron mobility transistors (HEMTs) based on gallium nitride (GaN) substrates are presented. The devices, grown with plasma assisted molecular beam epitaxy (PAMBE), are to be used for power switching applications. Very high quality p- and n-type films were grown. Some test results are shown for surface smoothness and for successfully processed Schottky diodes.
介绍了基于氮化镓衬底的结场效应晶体管(jfet)和高电子迁移率晶体管(hemt)。该器件是用等离子体辅助分子束外延(PAMBE)生长的,将用于功率开关应用。生长出高质量的p型和n型薄膜。一些测试结果显示表面光滑和成功加工肖特基二极管。
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引用次数: 2
A simple rolling mill model with linear quadratic optimal controller 基于线性二次最优控制器的简单轧机模型
J. Pittner, N. Samaras, M. Simaan
The tandem rolling of metal is a complex engineering process whose optimization represents a challenging control problem. The current technology relies on complex nonlinear models that are used to develop control strategies to address the various control problems encountered. Such models however, necessitate extensive computational requirements for simulation. Also, in various instances, access to the detailed models may be unavailable, or computational capability may be limited, yet it is desired to obtain some rough indication of performance of specific control systems when coupled to the mill. Thus the need arises for a simplified model (which can be easily implemented on a PC) for testing of control concepts. This paper fulfills such a need by providing a simple linearized model of the mill. An example of the usefulness of the model is presented by coupling to a linear quadratic optimal controller with a simple method to mitigate disturbances in incoming metal thickness. Satisfactory results are demonstrated by a simulation.
金属连轧是一个复杂的工程过程,其优化是一个具有挑战性的控制问题。目前的技术依赖于复杂的非线性模型来开发控制策略,以解决遇到的各种控制问题。然而,这种模型需要大量的计算需求来进行模拟。此外,在各种情况下,可能无法获得详细的模型,或者计算能力可能受到限制,但希望在与轧机耦合时获得特定控制系统性能的一些粗略指示。因此,需要一个简化的模型(可以很容易地在PC上实现)来测试控制概念。本文通过提供一个简单的磨机线性化模型来满足这种需要。通过将该模型与线性二次最优控制器耦合,以一种简单的方法减轻来料金属厚度的干扰,说明了该模型的有效性。仿真结果表明了满意的结果。
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引用次数: 10
Performance analysis and optimization of the travelling wave ultrasonic motor 行波超声电机的性能分析与优化
M. Bullo, Y. Perriard
The authors present a method allowing evaluation of the mechanical performances (torque, speed, mechanical power, dissipated losses on the surface of contact between stator and rotor) of travelling wave ultrasonic motors. The visualization of the motor characteristics makes it possible for the manufacturer to optimize the operation point of the motor compared to the commonly used criteria. The method was developed based only on a 2-D equivalent mechanical model of the motor.
提出了一种评估行波超声电机机械性能(转矩、转速、机械功率、定子与转子接触表面耗散损耗)的方法。与常用的标准相比,电机特性的可视化使制造商能够优化电机的工作点。该方法仅基于电机的二维等效力学模型。
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引用次数: 4
Simultaneous analysis of particle size and electrostatic charge distribution using phase Doppler anemometry 用相位多普勒风速法同时分析颗粒大小和静电电荷分布
J. Kulon, B. Malyan, W. Balachandran
The proposed noninvasive method of measurement of the charge level on a population of particles employs the phase Doppler anemometry (PDA) technique in conjunction with a high-resolution computer controlled traversing system. The PDA system was used to track the motion of charged particles in the presence of a DC electric field. By solving the equation of a particle motion in a viscous medium combined with the simultaneous measurement of its size and velocity the magnitude as well as the polarity of the particle charge can be resolved. In order to detect particles with high electrical mobility and to cover the wide range of electrostatic charges the probe volume was moved mapping the velocity of the particles within the space between the parallel plate electrodes. The preliminary experimental tests were carried out on dioctyl phthalate aerosol droplets produced by nebulising isopropanolic solutions using a Medic-Aid Sidestream nebuliser. The experimental results show that inherent electrostatic charge on dioctyl-phthalate droplets ranged from -250 to 250 electrons with an average charge-to-mass ratio of 0.24/spl mu/C/g. In case of precharged aerosol the average charge-to-mass ratio increased to 20/spl mu/C/g. The results presented demonstrate capability of the technique to allow real-time determination of particle size and charge with a high particle count rate in order of several thousands particles per second.
提出了一种非侵入性的测量粒子群电荷水平的方法,该方法采用了相多普勒风速测量(PDA)技术,并结合了高分辨率计算机控制的穿越系统。PDA系统用于跟踪带电粒子在直流电场作用下的运动。通过求解粒子在粘性介质中的运动方程,结合同时测量粒子的大小和速度,可以求解粒子电荷的大小和极性。为了检测具有高电迁移率的粒子,并覆盖大范围的静电荷,探针体积在平行板电极之间的空间内移动,映射粒子的速度。对医用侧流雾化器雾化异丙醇溶液产生的邻苯二甲酸二辛酯气溶胶液滴进行了初步实验测试。实验结果表明,邻苯二甲酸二辛酯液滴上的固有静电电荷在-250 ~ 250个电子之间,平均电荷质量比为0.24/spl mu/C/g。预充气溶胶的平均电荷质量比增加到20/spl mu/C/g。结果表明,该技术能够以每秒数千个粒子的高粒子计数率实时测定颗粒大小和电荷。
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引用次数: 4
A design procedure for a PM machine with extended field weakening capability 具有扩展磁场减弱能力的永磁机床的设计过程
J. Tapia, F. Leonardi, T. Lipo
A design procedure for the consequent pole permanent magnet (CPPM) machine is presented. Due to its double excitation nature (PM and field winding) and inherent three-dimensional flux distribution, an appropriate set of equations must be derived to model its magnetic structure. For practical operating conditions, radial, axial and tangential flux components are present. Therefore a convenient representation of the magnetic sources and their magnetic paths are necessary. For this purpose, a simplified reluctance-based equivalent circuit for 2-poles is developed to capture the main features of the machine. Approximated expressions for the airgap flux and the airgap flux density are derived. In these expressions the constant contribution of the PM and the variable flux provided by the field winding are taken into account. In addition, a formulation to calculate AC and DC slot geometry, copper and iron losses estimation and output power are developed. Finally, an optimization procedure is outlined based on maximum material utilization under current and magnetic loading constraints.
介绍了顺极永磁(CPPM)电机的设计过程。由于其双激励特性(PM和场绕组)和固有的三维磁通分布,必须推导出一组合适的方程来模拟其磁结构。在实际操作条件下,存在径向、轴向和切向磁通分量。因此,有必要方便地表示磁源及其磁路。为此,开发了一种简化的基于磁阻的2极等效电路,以捕捉机器的主要特征。导出了气隙磁通和气隙磁通密度的近似表达式。在这些表达式中,考虑了永磁的恒定贡献和磁场绕组提供的可变磁通。此外,还提出了一种计算交直流槽几何形状、铜铁损耗估算和输出功率的公式。最后,提出了基于电流和磁载荷约束下材料利用率最大化的优化方法。
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引用次数: 20
Performance analysis of a coreless permanent magnet brushless motor 无芯永磁无刷电机的性能分析
J. Gieras, I. Gieras
The paper deals with a new disk type PM brushless motor consisting of only stator (armature) winding and permanent magnet (PM) excitation system. No stator and rotor ferromagnetic cores have been used. To obtain the required value of the magnetic flux density in the air gap, PMs have been arranged in the so called "Halbach array". The FEM analysis has been done to prove that in a double sided motor with internal stator (twin PM rotor embracing a coreless stator), the peak value of the magnetic flux density can exceed 0.6 T. This is a sufficient value to design a high power density machine. A low speed 10 kW motor has approximately 1% higher efficiency and provides 82% more output power per kilogram than its cylindrical counterpart with a ferromagnetic core.
本文研究了一种仅由定子(电枢)绕组和永磁励磁系统组成的新型盘式永磁无刷电机。没有使用定子和转子铁磁铁芯。为了获得气隙中所需要的磁通密度值,将pm排列成所谓的“Halbach阵列”。通过有限元分析,证明了双转子内定子(双转子无芯定子)双面电机的磁通密度峰值可超过0.6 t,这足以设计出高功率密度电机。低速10千瓦电机的效率约为1%,每公斤输出功率比具有铁磁磁芯的圆柱形电机高82%。
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引用次数: 34
Dynamic analysis of frequency-controlled electronic ballasts 频率控制电子镇流器的动态分析
Yan Yin, R. Zane, R. Erickson
This paper presents analytical tools aimed at improving and simplifying the development of frequency-controlled dimming electronic ballasts. A modified phasor transformation is proposed that converts a frequency-modulated signal into an equivalent time-varying phasor. The proposed transformation is applied to develop a complete small-signal phasor model of the LCC resonant ballast, which explicitly models the effect of the frequency modulation on the envelopes of the outputs. A Spice-compatible implementation of the model is presented that facilitates AC analysis of the ballast in addition to envelope transient simulation, and is verified through comparison of experimental and simulation results. A closed-form solution of the control-to-output current transfer function for the ballast-resistor system is presented, along with key observations of the pole locations and low-frequency gain that facilitate simple and intuitive compensator design. Finally a design example for the feedback controller is given to verify the theoretical analysis.
本文介绍了旨在改进和简化频控调光电子镇流器开发的分析工具。提出了一种将调频信号转换为等效时变相量的改进相量变换方法。应用所提出的变换建立了LCC谐振镇流器的完整小信号相量模型,该模型明确地模拟了调频对输出包络的影响。提出了一个spice兼容的模型实现,除了包络暂态仿真外,还便于对镇流器进行交流分析,并通过实验和仿真结果的比较进行了验证。给出了镇流器-电阻器系统的控制-输出电流传递函数的封闭解,以及极点位置和低频增益的关键观测结果,从而方便了简单直观的补偿器设计。最后给出了反馈控制器的设计实例,验证了理论分析的正确性。
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引用次数: 18
Second order approximation lumped parameter model for planar integrated L-L-C-T module [power conversion] 平面集成L-L-C-T模的二阶近似集总参数模型[功率转换]
Rengang Chen, J. Strydom, J. D. van Wyk
Planar integrated L-L-C-T (inductor-inductor-capacitor-transformer) technology has been the subject of intensive research over the last few years. Research of modeling and explaining its behavior in different power electronic circuits has been conducted. However, most of the previous models are based on first order approximation. High frequency characteristics of L-L-C-T cannot be modeled by those models. A second order approximation lumped parameter equivalent circuit of L-L-C-T is proposed in this paper. This model can describe the characteristics of L-L-C-T up to the third resonant frequency. The parameters of the model can be either extracted from small signal measurement or calculated from the L-L-C-T geometry structure. The proposed model is used to analyze the secondary voltage ringing of an asymmetrical half-bridge converter (AHBC) in distributed power system (DPS) applications. The predicted result matches the measurement result well.
平面集成电感-电感-电容-变压器(L-L-C-T)技术是近年来研究的热点。对其在不同电力电子电路中的行为进行了建模和解释研究。然而,以往的模型大多是基于一阶近似的。这些模型无法模拟L-L-C-T的高频特性。本文提出了L-L-C-T的二阶近似集总参数等效电路。该模型可以描述L-L-C-T直至第三谐振频率的特性。模型参数既可以从小信号测量中提取,也可以从L-L-C-T几何结构中计算。该模型用于分析分布式电力系统中不对称半桥变换器的二次电压环。预测结果与实测结果吻合较好。
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引用次数: 14
Ringing effect analysis of the digital current pulse generator for the linear rail gun 线轨炮数字式电流脉冲发生器的振铃效应分析
J. Kuo, Z. Chang, Jiann-Der Lee, Y. Chio, Ping-Hsun Lee
In this paper, the transient analysis and design of a current pulse generator for a rail gun is presented. In this paper, the ringing effect is investigated. Based on the half-bridge circuit, the possible switching pattern causing the ringing effect is verified thoroughly. A high frequency switching model is derived for the linear rail gun. The equivalent circuit model is also derived to analyze the ringing effect further. An FPGA digital implementation for the current pulse control is also concentrated upon to obtain precise timing control for the current pulse generator. By simulation and experimentation, it shows that the ringing phenomena can be observed by way of this developed model. The current pulse is generated successfully with the digital implementation. It is believed that the associated investigation is useful to improve the performance for the linear rail gun.
本文介绍了轨道炮电流脉冲发生器的瞬态分析与设计。本文对振铃效应进行了研究。基于半桥电路,彻底验证了可能引起振铃效应的开关模式。建立了线轨炮的高频切换模型。推导了等效电路模型,进一步分析了振铃效应。本文还重点研究了电流脉冲控制的FPGA数字实现,以实现对电流脉冲发生器的精确定时控制。仿真和实验结果表明,利用该模型可以观测到环形现象。通过数字实现成功地产生了电流脉冲。认为相关的研究对提高线轨炮的性能是有益的。
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引用次数: 6
期刊
Conference Record of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No.02CH37344)
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