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Comparative Study of Alternative Permanent Magnet Linear Oscillating Actuators

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Comparative Study of Alternative Permanent Magnet Linear Osc...

第11届国际电机与系统学术会议

作者： d.howe department of Electronic ＆ Electrical Engineering University of Sheffield

＜正＞Single-phase permanent magnet（PM） linear oscillating actuators having alternative topologies are designed and analyzed by finite element analysis,with particular reference to a novel tubular E-core interior permanent magnet（IPM） oscillating *** electromagnetic performance is compared and relative merits are *** shows that the E-core actuators exhibit much less end flux leakage than the C-core actuators,and that the E-core IPM actuator is capable of producing equivalent peak force as the E-core Halbach surface PM actuator with nearly half the PM material used,while the mover structure is much simpler and easier to ***,the design parameters of the IPM actuator,*** magnet pole ratio and the split ratio,are optimized.

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电机参数误差对永磁同步电机弱磁性能的影响(英文)

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中国电机工程学报 2008年第6期28卷 92-98页

作者：陈阳生黄碧霞诸自强 d.howe 浙江大学电气工程学院浙江省杭州市310027 谢菲尔德大学电气电子工程系英国谢菲尔德SI3JD

在矢量控制的永磁同步电机控制系统中,d轴和q轴电流的控制一般是根据电机数学模型推导的最佳性能轨迹,如恒力矩区的每安培电流最大力矩控制和弱磁区的最大功率控制。文中通过大量的实验,研究了当电机模型使用了不精确的各种电机参数后,... 详细信息

在矢量控制的永磁同步电机控制系统中,d轴和q轴电流的控制一般是根据电机数学模型推导的最佳性能轨迹,如恒力矩区的每安培电流最大力矩控制和弱磁区的最大功率控制。文中通过大量的实验,研究了当电机模型使用了不精确的各种电机参数后,对永磁同步电机的性能产生的不同影响。

关键词：永磁同步电机弱磁电机参数误差

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Optimal Combination of Stator and Rotor Pole Numbers in Flux-Switching PM Brushless AC Machines

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Optimal Combination of Stator and Rotor Pole Numbers in Flux...

11th International Conference on Electrical Machines and Systems

作者： A.Thomas d.howe department of Electronic and Electrical Engineering University of SheffieldSheffield S1 3JDU.K.

＜正＞The combination of stator and rotor pole numbers in flux-switching PM machines is optimized analytically and by finite element *** influence on the optimal rotor pole width and split ratio is *** shows that the optimal rotor pole width for maximum torque varies with the stator and rotor pole number but its sum of total rotor pole width maintains constant which is～1/3 of the total rotor *** also shows that the 12/14 stator/rotor pole FSPM machine exhibits 10% larger electromagnetic torque than the conventional 12/10 stator/rotor pole FSPM machine.

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Reduction of cogging force in slotless linearv permanent magnet motors

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Reduction of cogging force in slotless linearv permanent mag...

2002年全国直线电机学术年会

作者： Z.O.Zhu Z.P.Xia d.howe P.H Mellor Indeving ternis Cogging force.Slotless linear motors Indeving ternis Cogging force.Slotless linear motors Indeving ternis Cogging force.Slotless linear motors Indeving ternis Cogging force.Slotless linear motors

＜正＞ There are two potential causes of cogging force in linear permanent magnet motors, resulting from the slotting and the finite length of the iron-cored armature. The paper is concerned with slotless motors, for which a technique is described for minimising the cogging force which is produced when the armature has a mild steel sleeve （yoke）. By analysing the cogging-force wavelorm developed at one end of the sleeve- and optimising us axial length so that an opposing cogging-force wavetorm is developed at the other end. it is possible to obtain nearly zero resultant force The technique has been validated on a prototype motor and found to be effective and simple to implement

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NOVEL LINEAR TUBULAR BRUSHLESS PERMANENT MAGNET MOTOR

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NOVEL LINEAR TUBULAR BRUSHLESS PERMANENT MAGNET MOTOR

2002年全国直线电机学术年会

作者： Z.Q.Zhu P.J.Hor d.howe J.Rees-Jones University of Sheffield.UK University of Sheffield.UK University of Sheffield.UK Unilever Research Port Sunlight Laboratory.UK

＜正＞ INTROdUCTIONThere is an increasing requirement for controlled linear motion over short and long strokes, in the factory automation and packaging industries, for example. Linear brushless PM motors could offer significant advantages over conventional actuation technologies, such as motor driven cams and linkages and pneumatic/hydraulic rams . in terms of efficiency, operating bandwidth, speed and thrust control, stroke and positional accuracy, and indeed over other linear motor technologies, such as induction and switched reluctance motors.

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计算机辅助技术在方案设计中的应用

系统工程与电子技术 1982年第1期 1-7页

作者： d.howe CEng.FRAeS 宛琰

引言人们通常认为飞机的初始设计阶段是令人兴奋而又吸引人的,因为正是这个阶段确定了那些大家想看到的飞机的特性。艺术家在进行艺术构思时,可以让他的想象纵情飞翔。发明者有充分的能力提出方案革新,这些革新看来具有一些优点,但常... 详细信息

引言人们通常认为飞机的初始设计阶段是令人兴奋而又吸引人的,因为正是这个阶段确定了那些大家想看到的飞机的特性。艺术家在进行艺术构思时,可以让他的想象纵情飞翔。发明者有充分的能力提出方案革新,这些革新看来具有一些优点,但常常难以作出评价。据传说,过去一些富有经验、有审美

关键词：最佳化成本最优化财政管理参数数据方案设计统计数据计算机辅助技术程序包生物群落型基本型

Oxide-supported metal catalysts for anaerobic NAd+regeneration with concurrent hydrogen production

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Chinese Chemical Letters 2024年第2期35卷 263-267页

作者： Jianwei Li Joseph W.H.Burnett Claudia Martinez Macias Russell F.howe Xiaodong Wang Chemical Engineering School of EngineeringLancaster UniversityLancaster LA1 4YWUnited Kingdom Chemistry department University of AberdeenAberdeen AB24 3UEUnited Kingdom

We report SiO_(2)-supported monometallic Pt,Pd,Au,Ni,Cu and Co catalysts for proton-driven NAd+regeneration,co-producing H_(2).All metals are fully selective to NAd+where the order of turnover frequencies(Pt>Pd>Cu>Au,Ni and Co)coincides with those otherwise observed in electrochemical hydrogen evolution *** has revealed that NAdH is capable of converting the metal sites into a“cathode”without an external potential and the NAdH to NAd+reaction involves transferring electron and hydrogen atom ***-deficient Ptδ+(on CeO_(2))enhances TOF and the heterogeneous Pt/CeO_(2) catalyst is recyclable without losing any activity/selectivity.

关键词： NAd+regeneration Heterogeneous catalyst Hydrogenase mimic Hydrogen binding energy Hydrogen production

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一种自动化高精度相位测量系统

宇航计测技术 1984年第S1期 122-126页

作者： S.Stein d.Glaze J.Levine J.Gray d.Hilliard d.howe 乔石琼

一种采用了多种已有技术、具有多种特点的全自动测量系统已研制成功。这个系统为双混频时差技术的扩展而保持了它的重要特点:间歇时间为零,能进行相位差绝对测量,精度很高,能测量频率相同的振荡器并根据使用人选择的时间进行测量。对某... 详细信息

一种采用了多种已有技术、具有多种特点的全自动测量系统已研制成功。这个系统为双混频时差技术的扩展而保持了它的重要特点:间歇时间为零,能进行相位差绝对测量,精度很高,能测量频率相同的振荡器并根据使用人选择的时间进行测量。对某一套设计参数来说,理论分辨度为0。2ps,测量噪声为2ps(有效值)并可在所选时间的0.1s内进行测量。由于增加了定标器以消除过去实验中发生的周期模糊(CyCle ambiguify),双混频时差技术得到了发展。在这方面,系统的功能相当于一个分频器加上钟,对设备中被测的每一个器件的恒定相位延迟进行贮存。自动化是以ANSI/IEEE—583(CAMAC)接口标准为基础的。每个测量通道包括一个混频器,过零检波器、定标器和时间间隔计数器。一个两倍宽度的标准卡马克(CAMAC)组件中安装有四个通道。这个组件安装在一个标准的CAMAC箱内,备有控制器以便与多种计算机以及与任何IEEE—488兼容的装置相对接。现有两个系统已工作数月,一个系统每天工作24小时,从NBS时标的15个钟取得数据,另一个系统在实验室的短期实验中使用。

关键词：振荡器定标器电子设备混频器时间间隔计数器相位测量相移测量电量测量时差测量相位差混频技术综合器

Snapshot imaging of ultrashort electron bunches

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Light(Science & Applications) 2024年第7期13卷 1226-1228页

作者： Andreas döpp Ludwig-Maximilian-Universität München Am Coulombwall 185748GarchingGermany Max Planck Institut für Quantenoptik Hans-Kopfermann-Strasse 1Garching85748Germany

New measurements combine spatial and temporal information from optical transition radiation to estimate the three-dimensional structure of electron bunches from a laser wakefield accelerator.

关键词： ultrashort Snapshot electron