Modeling of a Switched Reluctance Machine Based on the Invertible Torque Function

This paper presents a switched reluctance machine model based on an invertible expression representing the torque-phase current relationship. The model can be useful for real-time control in high-performance applications when the command current is derived from the torque command. The two angular functions that the model requires as input can easily be calculated from the known static torque-position characteristics for two currents. However, the paper also proposes the analytical models of the angular functions. The result is a geometry-based analytical model, with all parameters derived from machine geometry and material properties. Simulation and experimental results illustrate that the model provides very high accuracy.      

Comparison of Demagnetization Models for Finite-Element Analysis of Permanent-Magnet Synchronous Machines

We have studied a few simple demagnetization models, which are quick and easy to implement in finite-element calculations, and compared them with measured recoil behavior of Nd-Fe-B magnet material, also using a hysteresis model for comparison. The models are used to estimate post-demagnetization performance of an overloaded surface magnet synchronous machine. Two of the simple models, the sloped linear model and the exponent function model, give the most accurate results without significantly increasing the computation time.     

Finite-Element Analysis of a Switched Reluctance Motor Under Static Eccentricity Fault

This paper describes a two-dimensional finite-element analysis of an 8/6 switched reluctance motor with static eccentricity. It describes the influence of the eccentricity on the static characteristics of the motor and shows how to obtain flux lines, flux density distribution, and the flux-linkage/rotor angular position characteristic of the motor in both healthy and faulty conditions, as well as the static torque profiles of phases for different degrees of eccentricity. It shows that, at low current, the effect of the eccentricity is considerable compared to that at the rated current. Fourier analysis of the torque profile is used to study the variations of static torque harmonic contents.     

Finite-Element Analysis of the Magnetic Field and Electromechanical Parameters Calculation for a Slotted Permanent-Magnet Tubular Linear Motor

We have calculated magnetic field distribution and integral parameters for the slotted, five-phase, permanent-magnet tubular linear motor (PMTLM). We used a finite element (FE) model for the field analysis. We carried out the field analysis for different values of the exciting current and for variable mover position. To obtain experimentally the field distribution and its integral parameters, we developed and tested a physical model of the motor. We compared the calculation results with the measured ones and found a good conformity.     

基于功能分析系统技术与TRIZ的牙签包装机设计

目的提出一种功能分析系统技术与TRIZ集成的方法,并应用于自动牙签包装机设计。方法利用功能分析系统技术,绘制牙签包装机的功能系统图,再运用TRIZ理论、专利库以及现有经验将功能映射成结构,最后将各结构组合,得到基于功能分析系统技术和TRIZ的牙签包装机设计路线。结果得到了自动牙签包装机的设计方案,实现了大袋牙签包装的自动化,提高了生产效率。结论对牙签包装机的创新设计验证了该设计路线对新技术系统设计与开发的有效性。     

电动车用永磁同步电机的转矩阶次特征分析

针对电动汽车车身阶次振动和车内噪声的主要振源—永磁同步电机的转矩波动,首先通过转矩测量试验测得了电机24阶以内的动态、高阶转矩信号,分析与揭示了永磁同步电机转矩信号的阶次特性现象;为解释该试验现象,从理论上建立了一种考虑非正弦永磁磁场分布、开槽、时间谐波电流的永磁同步电机转矩波动数学模型,获得了谐波转矩的解析解,预测了转矩波动的阶次与频率,进而提出了试验测量动态、高阶转矩信号的转速判据。试验研究和理论研究表明：永磁同步电机的转矩具有明显的阶次波动特征,主要阶次有h-1、2（h-1）、6i+h-1、 6i-h+1阶（h∈N,且由变频器决定;i∈N）;h次时间谐波电流将单独引起h-1、2（h-1）阶的转矩波动,h次时间谐波电流、非正弦永磁磁场分布、开槽将共同引起6i+h-1、6i-h+1阶的转矩波动。     

卷绕式磁控溅射镀膜机张力控制系统分析与优化

为避免卷绕式磁控溅射镀膜过程中张力引起的薄膜缺陷,以及原有张力系统响应速度慢、稳定性差等不足,对张力系统进行了分析与优化。通过分析确定了影响张力的关键因素是收(放) 卷的速度和卷径变化,建立了张力系统动力学模型,采用simulink 对张力控制系统进行仿真分析,利用实验验证的方法,分别在原设备和改造后的设备上制备Al2 O3 薄膜,并对比其SEM 图像。改造后的系统可在0. 65 s 内实现薄膜张力实时调整,而原系统需要8 s。改造后的系统能够保证镀制过程中的张力恒定,膜层致密均匀、卷材层间无空隙和皱纹。     

Conceptual Design of a Field Coil for 5 MW HTS Synchronous Machine

Compared with a conventional rotating machine, a superconducting rotating machine fabricated by High Temperature Superconducting (HTS) tape has superior performance and efficiency due to the HTS field coil for the rotor which can generate high magnetic flux intensity. The two primary factors for the design of the HTS rotational machine are how to construct the optimal magnetic field path through the air gap located between the rotor and the stator and how to enhance the linkage magnetic flux density between the armature coil in the stator and the field coil in the rotor. A 5 MW HTS motor for ship propulsion is planned for development in early 2011 by a Korean collaboration group of KERI and DOOSAN Heavy Industry. As a part of this R&D efforts, we designed and analyzed the field coil for a 5 MW HTS synchronous motor. In this paper, the computational results of the magnetic field distribution on the whole winding regions of the HTS field coil of the superconducting rotating machine will be also presented and discussed.     

Calculation and Analysis of Stator End-Winding Leakage Inductance of an Induction Machine

This paper proposes an improved method for calculating the value of and for analyzing the frequency-dependence of the stator end-winding leakage inductance of an induction machine. The method was based on the stored magnetic energy, which was calculated by a 3-D time-harmonic finite element analysis. In this method, there were no rotary parts in the model of the simulated machine. The results of the analysis show that the stator end-winding is capable of influencing the end of the active region of the machine whereas the influence on the central part of the active region is small. In addition, the phenomenon that the stator end-winding leakage inductance, as well as the magnetic energy in the machine, relates to the frequency of the stator current is explored.      

光纤耦合成象系统的光学传递函数计算和分析

主要分析了光纤与ＣＣＤ耦合技术各单元的参数的关系，通过变换实验系统中耦合物镜的参数，得到了不同的实验结果，从理论上给出了整个系统传递函数的数学模型，并对实验系统作模拟计算，与实验结果进行比较，分析出对实验系统光学传递函数的影响因素。     

基于TRIZ理论的纸盒包装机成型机构设计与分析

目的为解决现有纸盒包装机存在的成型与粘盒工序分离、无法适应多规格纸盒生产、生产效率低等问题。方法文中引入发明问题解决理论(TRIZ理论),针对性地分析现有技术问题,提取出技术特征参数并组建矛盾对,通过查询矛盾冲突矩阵得到解决技术问题的发明原理,筛选出可用发明原理后再经过创新设计,对发明原理具体化,形成纸盒包装机成型机构的实际应用方案。结果得到了基于成型模块与喷胶组件有机耦合实现同一工位成型和粘盒,且可快速调整工装,以适用多种规格纸盒的成型机构创新设计方案。结论文中设计的纸盒包装机成型机构实现了成型与粘盒工序的集中,简化纸盒生产工序,又能满足多规格纸盒需求,提高设备柔性。     

Principle of Operation and Feature Investigation of a New Topology of Hybrid Excitation Synchronous Machine

We present a new topology of hybrid excitation synchronous machine (HESM) and describe operational principles and features of the new configuration. Using the radial/axial distribution of the magnetic field, we develop an equivalent magnetic circuit model. We obtain magnetic flux, flux density, and induced voltage with various electrical magnetomotive forces by calculating the nonlinear magnetic circuit equation. We studied the Influence on the radial magnetic field of the axial magnetic field by 3-D finite-element method. The results are in good agreement with calculation by our magnetic circuit model. Our findings indicate that the air-gap flux density of a flux-concentrating HESM is high and the magnetic field in the air gap can be successfully regulated. Experimental results of 3 kVA prototype machine verify the feasibility of the structure and the correctness of our analysis.      

颗粒型全自动包装机计量转盘极限转速的分析计算

以力学和运动学为理论基础,对颗粒型全自动包装机计量转盘的极限转速进行了分析计算,并得到了极限转速公式.该公式具有很重要的理论价值,也可供实际生产中参考,有利于保证计量的精确,避免因转速过高造成产品的"缺斤少两".     

绕组线击穿电压试验仪检定装置的设计与分析

依据JJG(粤)007-2016《绕组线击穿电压试验仪》检定规程,针对实际检定绕组线击穿电压试验仪过程中存在的问题,设计出一种能检定试验电压、升压速度、击穿动作电流、电压持续时间的检定装置,并对功能实现过程进行分析.该装置提高检定效率和检定数据的准确率,满足对绕组线击穿电压试验仪量值溯源的需要.     

导爆药粉下药装置的改进及分析

针对现有塑料导爆管生产过程中由于导爆药下药时易黏附在机针底部,导致机针堵塞或药粉在管内壁分布不均、爆速值不稳定的现象,本文通过增加气路装置、利用微气流吹扫药粉,抑制药粉的积聚。试验表明:微气流吹扫条件下,导爆药的下药均匀性和爆速均一性得到明显提高;药粉与导爆管内壁的黏附性亦大幅度增加,药粉脱落堆积现象减少,导爆管的使用可靠性得到提高;此外,机针经气流吹扫后表面温度降低近20℃,大大提高了导爆药的热安定性以及生产的本质安全性。     

Comparison of Pressure Drop between Calculation and Experiment for a Two-phase Carbon Dioxide Loop

Tracker thermal control system (TTCS) is an active-pumped two-phase carbon dioxide cooling loop, which is developed for the Alpha Magnetic Spectrometer tracker front-end electronics. The maintenance-free centrifugal pump is a critical component in the design mainly due to the limited pressure head with small mass flows. Therefore a correct pressure drop is required to predict the pressure drop for dynamic modeling. As the normal operational temperature of the carbon dioxide in the TTCS is from ??15°C to +15°C, which is very close to its critical point, 33°C, and many two-phase pressure drop correlations may not fit well here. In this paper, we attempt to correlate the pressure drops between the calculations and the experiment of the two-phase CO₂ loop. The comparison will focus on one evaporator. Here, the Lockhart/Martinelli correlation is recorrelated with different definition C value for CO₂ according to the test results. Comparison shows that, the new correlation can fit the test results well.     

扭矩标准装置结构及不确定度现状分析

分析了国内外扭矩标准装置不确定度现状，介绍了静重式扭矩标准装置的工作原理、不确定因素及不确定度分析方法，并对国内外扭矩标准装置的结构形式及其对装置准确度的影响程度进行了比较说明。     

几种水下钻孔爆破炸药单耗计算公式的分析与比较

水下爆破需要的炸药单耗与露天爆破相比存在很大差异。分析了水下钻孔爆破单耗的影响因素,对国内外的几种计算公式进行了分析比较,提出了基于清渣设备能力的水下爆破炸药单耗计算的修正方法。     

基于机-电相似性的隔振系统功率流计算与分析

从振动能量传递的观点,研究柔性基础上动力机械隔振系统功率流传递特性,是当前研究热点问题之一。根据机械和电气学科的交叉性和相似性,将电路分析中的戴维宁等效算法引进到机械隔振系统功率流的计算中推导出柔性基础上设备的单层隔振系统和具有中间质量块的多源多级隔振系统传入到基础的功率流表达式。最后编程进行仿真计算,根据计算结果系统地研究隔振器刚度、隔振器阻尼、中间质量块、基础厚度模量对输入到基础振动功率流的影响规律。