基于软件观测器的无刷直流电机控制策略研究和实验

论文提出了一种基于软件观测器实现无刷直流电机的正弦波控制的策略。在无刷直流电机正弦波控制系统中,需要准确的检测电机的位置和速度,但仅仅依靠电机自带的霍尔传感器无法获得电机位置和转速的精确值。论文提出的软件观测器以无刷直流电机自带的开关型霍尔传感器输出信号为参考,通过软件对电机模型进行重构,从而计算出精确的电机转角和电机速度的观测值,实现无刷直流电机的正弦波控制。实验结果表明,该策略有效地提高了无刷直流电机控制系统的性能。     

基于DSP的无位置传感器无刷直流电机控制系统

介绍一种基于DSP的无位置传感器无刷直流电机控制系统,电机的转速和位置信号由扩展卡尔曼滤波器估算.首先介绍了无刷直流电机的控制原理,然后给出了控制系统的框图,介绍了系统硬件电路和软件流程图,最后给出了结论.     

机器人关节无刷伺服器驱动控制系统设计

文中针对目前机器人关节伺服器微型化、智能化发展趋势,研制出无刷直流电机驱动集成电路,实现对无刷伺服器驱动控制。集成电路使用STM32F103系列芯片作为主控芯片,AO4606作为无刷直流电机驱动芯片,采用智能功率模块方波驱动无刷直流电机,提升了系统的集成度;结合控制器、上位机开发,以及霍尔传感器、位置检测器等传感器设计了一款机器人关节无刷伺服器驱动控制系统。通过优化控制算法对无刷直流电机进行转速、位置双闭环控制,结合硬件和软件实现无刷伺服器驱控一体设计,研制出无刷伺服器样机,最后搭建驱动控制系统实验平台。实验表明,研发的无刷伺服器及其驱动控制系统稳定可靠,可应用于多种机器人关节。     

基于肌张力反馈的深层肌肉刺激仪控制系统设计

针对目前深层肌肉刺激仪的不足,设计了一种基于肌张力反馈的深层肌肉刺激仪控制系统.系统采用STM32单片机为核心处理器,由无刷直流电机提供动力.系统由肌张力传感器采集人体肌张力信号,由霍尔传感器监测电机转速,并由限流电阻监测电机母线电流.单片机通过对肌张力信号、电机当前转速、电机母线电流以及操作人员的控制命令进行运算,进而实现对电机转速的调节.系统采用触摸屏进行人机交互,通过植入μC/OS-Ⅱ操作系统实现控制系统的软件设计.     

无位置传感器无刷直流电机驱动系统设计

传统的永磁直流无刷电机往往采用位置传感器来确定转子的位置,不仅增大了电机的安装体积,增加了成本,而且降低了电机的可靠性。无位置传感器无刷直流电机控制技术可以解决安装位置传感器给系统带来的工艺复杂、受工作环境限制等诸多问题,同时可以提高系统可靠性和抗干扰性能。因此,在小型轻载条件下,无位置传感器无刷直流电机成为理想的选择并具有广泛的发展前景。针对一种小型三相无位置传感器无刷直流电机,设计驱动控制系统,能够实时调节并反馈被控电机转速。同时系统提供隔离串口通信功能,方便与外部控制器或相关设备连接通信,实现系统的扩展与应用功能。设计系统具有体积小,成本低,电路稳定可靠,发热损耗低等方面优点。     

基于ML4425的无传感器无刷直流电机控制电路设计

针对航模用无传感器无刷直流电机具有体积小、质量轻、效率高和可靠性好等特点，设计开发了它的专用调速控制系统。首先分析了无传感器无刷直流电机的电路原理。接着以无传感器无刷直流电机专用调速控制芯片ML4425与PIC单片机为核心设计了硬件电路。详细介绍了电机调速控制电路、电机保护电路和系统调速信号检测的软件实现方法。     

基于DRV8323RS的无刷直流电机驱动器设计

无刷直流电机用电子换向来代替传统的机械换向,具有可靠性高、维护方便、使用寿命长等优点,但对控制器性能要求较高,驱动控制电路较为复杂。基于上述问题,设计了一种基于DRV8323RS驱动芯片的无刷直流电机驱动器。主控制器TMS320C6748通过SPI通信方式对DRV8323RS芯片进行模式配置后,产生一路PWM信号,实现对带有三相霍尔传感器的无刷直流电机的控制。实验结果表明,在保证稳定可靠的运行性能下,该设计方案简化了驱动电路设计,节约了主控制器硬件接口资源,实现了三相无刷直流电机的精确控制,为单一主控制器实现多路电机驱动控制提供可行性方案,具有较高的应用价值。     

直流电机控制与速度检测系统

以STC89C52单片机作为控制器,采用L298N芯片作为电机控制芯片,选用S177霍尔元件传感器,并用T测量法,设计了直流电机控制和速度检测系统。该系统能对电机的转速和转向进行实时控制,能同步显示电机转速与转向。系统具有控制灵敏,速度检测准确,电路简单易行的特点。     

基于DSP和IPM的三相无刷直流电机控制系统设计

通过采用智能功率驱动芯片L6235对控制系统驱动电路进行设计,实现由一路PWM信号和一路GPIO信号控制三相无刷直流电机的调速与换向,达到利用单个DSP对多电机进行控制的目的,降低了控制系统硬件资源冗余和驱动电路的体积与功耗.在此基础上,进行了电机位置控制实验.实验结果表明,该系统控制的电机响应时间短、控制精度高,具有优良的起动特性和制动特性,可获得良好的运动和控制特性.     

一种电机调速器主控板系统设计

转速控制器的设计主要由AT89C51单片机、LCD显示器、光电传感器、L298（驱动芯片）、键盘接口和直流电动机等组成.该设计是以AT89C51单片机作为核心的直流电机转速控制系统,采用光电传感器检测电机转速,键盘输入电机设定转速.     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....