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基于设计步进电机控制系统的目的,主要设计以PLC为核心控制器的步进电机控制系统。在对常见的三相反应式步进电动机工作原理详细阐述的基础上,对步进电机的控制原理进行分析说明。以西门子S7-200系列PLC对步进电机的控制为例,通过对S7-200系列PLC的高速输出点直接对步进电机进行运动控制的方案设计,设计相应的外部接线图、程序,并对具体的控制参数进行说明。 相似文献
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数字阀的分级控制及非线性 总被引:8,自引:0,他引:8
作为数字阀电—机械转换器的步进电动机,在连续跟踪控制下由于驱动其转子旋转的电流为正弦波电流,因此阀的输入—输出特性表现出某种重复特征,该重复特征称为数字阀的分级控制特性。由于步进电动机的磁路存在磁饱和与磁滞,因此在数字阀输入—输出关系上表现为波动和滞环等非线性。为了分析数字阀的非线性,采用正弦波曲线模拟磁路的饱和与磁滞非线性;建立数字阀输入—输出特性的支配方程构建数字阀输入—输出理论模型;设计试验装置实际测量数字阀分级控制的非线性指标,并验证理论结果的正确性。理论及试验结果表明数字阀的非线性度、滞环及分辨率等指标与分级控制的级数成反比。据此,增大数字阀的分级数是减小其非线性、提高控制精度的有效途径。 相似文献
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The near-field images calculation method for semiconductor surface with inhomogeneous electron distribution, formed by strong focused laser pulse, was proposed. Calculation is performed using Green function method. The main characteristic of the proposed approach is maximal usage analytical computations. The near-field images for the surface of GaAs were obtained at different points of time. Developed approach is universal and could be able to find with experimental data on time-resolved near-field microscopy some parameters of semiconductor surface such as diffusion constant and relaxation time. 相似文献
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针对弹性浮动研磨系统中步进电机控制所存在的缺点,提出了基于ARM9芯片的嵌入式触摸屏界面控制方案。通过分析步进电机控制不平稳产生的原因,对步进电机步距角进行细分控制,得到平稳运行的控制效果。同时基于ARM9芯片,摒弃以往以PC机做为上位机进行人机交互的方案,通过直接操作触摸屏界面对步进电机进行控制,从而使步进电机操作可视便捷。 相似文献
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G. C. Gaunaurd H. C. Strifors A. Sullivan 《Sensing and Imaging: An International Journal》2008,9(1-2):9-25
Using a Method-of-Moments (MoM) code, we earlier simulated ultra-wideband (UWB) returned echoes from two targets, one penetrable and one impenetrable, buried in a soil with known electric properties. The simple shape of mines, coupled with their predictable deployment in the ground, has also provided a fundamental understanding of the underlying backscatter phenomenology. In particular, the backscattered waveform from a mine can be decomposed into a collection of closely spaced copies of an elemental wave object with different amplitudes and time delays. This wave object is here defined as the derivative of the waveform incident on the target. The spacing of the copies or replicas of the wave object could be determined by the round trip time delay between scattering centers. This methodology was previously applied to impenetrable targets and is now applied also to a penetrable target. The previously computed returns from each target for a given incident pulse are modeled by a few copies of the elemental wave object with the time delay and amplitude of each copy taken as unknown parameters. These parameters are then determined by minimizing in the least square sense the difference between the MoM computed signal and the model signal using the differential evolution method (DEM). The methodology is extended by way of our previously developed target translated method (TTM) to approximate the computation of the backscattered model signal when the target is buried at a different depth in the soil with a different moisture content. 相似文献
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两相混合步进电机恒转矩细分驱动设计及应用 总被引:2,自引:0,他引:2
针对两相4线步进电机,给出一种基于单片机和多通道DAC的斩波恒转矩细分驱动方案,阐述细分控制策略,重点讨论了斩波恒流驱动的硬件电路实现方法,给出硬件功能框图及软件设计思想。应用到数控电动云台,带动专业摄像机,使拍摄过程平稳,无抖动散焦。 相似文献
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胡海 《机电产品开发与创新》2011,24(2):158-159,177
步进电机作为机电一体化产品的主要执行元件,其精度决定了工业生产的精度,在分析了细分驱动原理后,本文提出了基于电流矢量恒幅均匀旋转的步进电机细分驱动方法,并将其应用于二相混合式步进电机,以单片机为核心设计了控制电路原理图,验证了该方法的可行性,为深入研究提供了参考. 相似文献
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应用单片机、步进电机驱动芯片、字符型LCD和键盘阵列,构建了集步进电机控制器和驱动器为一体的步进电机控制系统.采用AT89S51单片机实现对两相步进电机的转速控制.由单片机产生的脉冲信号经过脉冲分配器后分解出对应的四相脉冲,通过分解出的四相脉冲经驱动电路功率放大后驱动步进电机的转动.该装置可以有效的减少系统开发领域的周... 相似文献
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针对汽车自适应前照明系统(Adaptive Front-lighting System,AFS)的发展背景,在此基础上详细介绍了汽车前照明系统的工作模式,给出了系统所实现的功能及工作原理,并详细阐述系统工作的理论基础.根据系统的工作要求,对所用传感器进行了选择,并详细解释选择各型号传感器的原因,且对外围电路进行了简单的... 相似文献
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主要介绍步进电机驱动器A3983芯片及其应用。阐述了该芯片的工作原理及引脚功能。并给出了由A3983组成的步进电机驱动电路及与单片机的接口以及在使用时的注意事项。 相似文献