长导线对变频器控制电机的影响及解决办法

变频器及变频电机已普遍应用于工厂的各个领域，变频电机的损坏也日益突出。本文分析了长导线对变频器控制电机的影响，以杭钢线材轧机的变频电机损坏为例，进行机理分析，并给出解决办法，以防止电机的进一步损坏，确保生产的正常进行。     

大容量同轴电机多相整流的可逆调速系统设计

轧钢生产线上常规的同轴电机控制的拓扑结构和控制方式是由2台6相整流系统分别为2台电机供电，主从控制，实现2台同轴电机运行。由于大容量6相整流产生脉动电流大、谐波大，影响电机使用寿命，因此，需要在直流回路增加平波电抗器，但平波电抗器的增设又会增大电机的机电时间常数，影响电机运行动态特性。针对上述问题，提出了一种大容量同轴电机多相整流的可逆直流调速系统，对现有同轴电机拓扑结构和控制方式进行改进，通过整流变压器和可逆整流装置，对交流侧电网构成多相整流，整流变压器二次侧电压相位错开，以减少电网谐波，提高功率因数。     

冷轧厂HC轧机主电机通风系统改造

通过对攀钢冷轧厂HC轧机主电机通风系统改造，解决了电机风量不足及轧机侧的油雾和含金属粉尘通过主电机联轴节与通风密闭室隔墙板之间的空隙进入主电机密闭室，进而进入电机内，造成油雾和含金属粉尘只在电机电枢绕组、升高片和磁极绕组以及连线上，甚至进入电枢铁芯内侧，不易清理，不仅会降低电机绝缘寿命，严重时还可能造成大电机短路放炮事故的问题。     

变频电机有关问题的探讨

从电机理论和电路分析理论出发，对交流变频传动系统中的交流电机的运行情况作了较为深入的分析；从系统的观点讨论控制系统与电机的相互影响及相互制约的关系，由此基础上给出了变频电机的概念及内涵，对各类变频传动系统中变频电机的设计、制造、选型、应用试验提出了系统的要求和原则性结论，在变频传动理论和工程应用方面有一定的指导意义。     

更新主电机适应大型厂生产的发展

鞍钢大型厂的主传动电机多年来一直超负荷运行，严重影响了生产。因此，急需更新主电机。在参考国内外同类型产品的基础上，对原来的主电机进行更新改造，并对工期做出估计，提出了几种可行性方案，供有关部门参考。     

酸洗轧机联合机组双卷筒卷取机主电机选型校核

结合机组的工艺参数和实际生产情况，对唐山丰南1450mm酸洗轧机联合机组双卷筒卷取机主电机选型进行了计算和校核，并在校核中引入了“过载”的概念，克服了一般校核方法中仅采用最大扭矩校核而造成电机功率偏大的缺点。通过充分利用电机的过载能力来进一步降低电机的功率，可节约能源降低消耗。     

突破传统换向理论的制约，彻底解决初轧主电机换向困难的技术问题

本文通过对解决初轧主电机换向困难问题的探讨，根据电机实际负载情况，合理选择适度的超前换向补偿度，彻底解决了该电机换向困难的技术难题。     

振动诊断和现场动平衡技术的应用

针对昆钢三烧车间2^#T5600kw的电机状况，应用振动监测技术准确分拆了主电机的故障原因，并采用现场动平衡技术对主电机的转子进行了不平衡校正，达到了预期的目的，满足了生产实践的需要。     

永磁微特电机用磁体的合理选择和市场预测

本文根据永磁微特电机对永磁材料的要求，分析了电机用磁体，特别硬磁铁氧体和粘结钕铁硼的各项性能，结合笔者生产实践经验，提出永磁微特电机用磁体的合理选择，并预测了未来的市场竞争趋势。     

大型异步电机噪声预估

用自行编制的电机噪声预估软件，对实际电机进行了测试，结果比较精确。     

1998 ISEK Congress Keynote Lecture: Motor units: how many, how large, what kind? International Society of Electrophysiology and Kinesiology

There are now at least nine methods for motor unit number estimation (MUNE) in living human muscles. All methods are based on the comparison of an average single motor unit potential (or twitch) with the response of the whole muscle. Such estimations have been performed for proximal and distal muscles of the arm and leg in healthy subjects and in patients with various neuromuscular disorders. In healthy subjects there is a loss of motor units which is most evident in distal muscles and after the age of 60 years. Substantial losses of motor units have been measured in patients with ALS, post-polio symptoms, and diabetic peripheral neuropathies. In contrast, normal MUNEs have been found in approximately half of patients with persisting obstetric brachial palsies. The sizes of motor units show considerable variations within the same muscle and also between muscles; very large units are usually present in severe partial denervation. Although many motor unit properties are largely governed by motoneurons, some exhibit less plasticity in humans than in other mammals.     

新能源车电机用硅钢选材分析

为了提升新能源车用驱动电机的功率密度,各大电机厂商都在不断地提升电机转速,随之而来的问题就是电机的铁耗也在不断增高,如何降低电机铁耗成为了电机厂商必须要解决的难题.本文讨论了电机铁耗的组成部分及影响因素,并对1台8极48槽的永磁同步电机分别使用3种不同厚度的材料进行仿真,对比其效率及铁耗分布,推导出驱动电机中硅钢厚度、铁耗及成本的关系,最后对驱动电机选材提出建议.     

The Cinderella of Psychology: The Neglect of Motor Control in the Science of Mental Life and Behavior.

One would expect psychology--the science of mental life and behavior--to place great emphasis on the means by which mental life is behaviorally expressed. Surprisingly, however, the study of how decisions are enacted--the focus of motor control research--has received little attention in psychology. This article documents the neglect and considers possible reasons for it. The hypotheses considered include three that are raised and then rejected: (a) no famous psychologists have studied motor control, (b) cognitive psychologists are mainly interested in uniquely human functions, and (c) motor control is simply too hard to study. Three other hypotheses are more viable: (d) cognitive psychologists have been more interested in epistemology than in action, (e) psychologists have disfavored motor control because overt responses were the only admissible measure in behaviorism, and (f) psychologists have felt that neuroscientists have the market cornered when it comes to motor control research. There are signs that motor control's Cinderella status is changing. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

热剪主电机的智能保护

介绍了M60低压电机智能保护控制器在中板厂热剪主电机上的应用。主要介绍M60低压电机智能保护控制器的硬件构成、功能特点、上位机软件使用、系统设置等。在热剪主电机安装使用后,保护作用明显,效果良好,为推广应用到其它电机上提供了先例。     

Timing of skilled motor performance: Tests of the proportional duration model.

Historically, theories of motor control have been based on either central or peripheral mechanisms. This article examines a current, explicit, central theory accounting for the observed flexibility in motor performance: the generalized motor program with a multiplicative rate parameter. Reanalysis of data from a variety of motor skills reported in the literature and a detailed study of skilled typewriting show that a generalized motor program with a multiplicative rate parameter generally does not fit observed performance. Instead, the data support a composite model of motor control in which performance is determined by both central and peripheral mechanisms. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Motor maps, seizures, and behaviour.

Atypically organised motor maps have been described in some people with epilepsy and we have modelled this in rats. Our goal is to more fully understand the mechanisms responsible for seizure-induced functional brain reorganisation and to reverse their effects. Here we present an overview of the relationship between neocortical motor maps, seizures, and interictal behaviour. To begin we summarise the observations of atypical motor maps with epilepsy and in animal models following experimentally induced seizures. Our novel experiments have established that motor map expansion is linked to a functional alteration of motor behaviour. Evidence for some of the putative brain mechanisms responsible for motor map size is discussed. Our successes reversing seizure-induced map expansion by two different methods are also briefly reviewed. Lastly, unanswered questions for possible future experimentation are posed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Anosognosia for motor impairment following left brain damage.

Anosognosia for motor impairment has been linked to lesions of the right hemisphere. However, left hemisphere damaged patients have often been excluded from investigation because of their associated language deficits. In this study we assessed anosognosia for motor disorders in a group of left hemisphere damaged patients using 2 tools that assess the presence of unawareness—a structured interview that is a common method of assessment of anosognosia in clinical settings, and a new tool, the Visual-Analogue Test for Anosognosia for Motor Impairment (VATAm; Della Sala, Cocchini, Beschin, & Cameron, in press). The structured interview relies heavily on language and enquires about general motor ability whereas the VATAm is less dependent on language abilities and enquires about specific motor tasks. Results suggest that the frequency of anosognosia in left brain damaged patients may have been underestimated due to methodological reasons, and that anosognosia for motor impairment can also be associated with lesions of the left hemisphere. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

In vitro motility of AtKCBP, a calmodulin-binding kinesin protein of Arabidopsis

AtKCBP is a calcium-dependent calmodulin-binding protein from Arabidopsis that contains a conserved kinesin microtubule motor domain. Calmodulin has been shown previously to bind to heavy chains of the unconventional myosins, where it is required for in vitro motility of brush border myosin I, but AtKCBP is the first kinesin-related heavy chain reported to be capable of binding specifically to calmodulin. Other kinesin proteins have been identified in Arabidopsis, but none of these binds to calmodulin, and none has been demonstrated to be a microtubule motor. We have tested bacterially expressed AtKCBP for the ability to bind microtubules to a glass surface and induce gliding of microtubules across the glass surface. We find that AtKCBP is a microtubule motor protein that moves on microtubules toward the minus ends, with the opposite polarity as kinesin. In the presence of calcium and calmodulin, AtKCBP no longer binds microtubules to the coverslip surface. This contrasts strikingly with the requirement of calmodulin for in vitro motility of brush border myosin I. Calmodulin could regulate AtKCBP binding to microtubules in the cell by inhibiting the binding of the motor to microtubules. The ability to bind to calmodulin provides an evolutionary link between the kinesin and myosin motor proteins, but our results indicate that the mechanisms of interaction and regulation of kinesin and myosin heavy chains by calmodulin are likely to differ significantly.     

Function of protonatable residues in the flagellar motor of Escherichia coli: a critical role for Asp 32 of MotB

Rotation of the bacterial flagellar motor is powered by a transmembrane gradient of protons or, in some species, sodium ions. The molecular mechanism of coupling between ion flow and motor rotation is not understood. The proteins most closely involved in motor rotation are MotA, MotB, and FliG. MotA and MotB are transmembrane proteins that function in transmembrane proton conduction and that are believed to form the stator. FliG is a soluble protein located on the cytoplasmic face of the rotor. Two other proteins, FliM and FliN, are known to bind to FliG and have also been suggested to be involved to some extent in torque generation. Proton (or sodium)-binding sites in the motor are likely to be important to its function and might be formed from the side chains of acidic residues. To investigate the role of acidic residues in the function of the flagellar motor, we mutated each of the conserved acidic residues in the five proteins that have been suggested to be involved in torque generation and measured the effects on motility. None of the conserved acidic residues of MotA, FliG, FliM, or FliN proved essential for torque generation. An acidic residue at position 32 of MotB did prove essential. Of 15 different substitutions studied at this position, only the conservative-replacement D32E mutant retained any function. Previous studies, together with additional data presented here, indicate that the proteins involved in motor rotation do not contain any conserved basic residues that are critical for motor rotation per se. We propose that Asp 32 of MotB functions as a proton-binding site in the bacterial flagellar motor and that no other conserved, protonatable residues function in this capacity.