一种用于马达驱动芯片的过热保护电路

设计了一种应用于马达驱动芯片的过热保护电路。该电路主要由使能电路、基准电压源、温度检测电路、比较输出电路四部分组成。其中,温度检测电路利用PNP晶体管的发射极-基极电压具有负温度系数的特点;为了防止热振荡发生,比较输出电路采用具有磁滞功能的电压比较器。HSPICE仿真结果表明,该电路温度灵敏度高,关闭和开启温度点受电源的影响很小。     

Modeling and design of geared DC motors for energy efficiency: Comparison between theory and experiments

Energy efficiency is a growing concern in today’s mechatronic designs. In recent years, many works have emerged presenting energy-efficient actuators with electrical motors. However, there is little consistency in the way energy consumption is calculated. Drive inertia, motor efficiency and controller efficiency are often neglected in optimizations, and so are the load- and speed-dependency of the losses and other non-linearities. While this approach works well in stationary circumstances, it can lead to significant errors in highly dynamic tasks with a wide range of operation, such as the ones faced by actuators in the field of robotics. This paper discusses the losses occurring in an actuator consisting of a DC motor and gearbox as it is forcing a swinging motion on a pendulum. From this simple case study, some general recommendations on the modeling of energy losses are formulated. Combining data from manufacturer’s datasheets with empirical data, the approach presented in this paper was able to predict the energy consumption for this specific case with an error of less than 10%.     

Hand synergies: Integration of robotics and neuroscience for understanding the control of biological and artificial hands

The term ‘synergy’ – from the Greek synergia – means ‘working together’. The concept of multiple elements working together towards a common goal has been extensively used in neuroscience to develop theoretical frameworks, experimental approaches, and analytical techniques to understand neural control of movement, and for applications for neuro-rehabilitation. In the past decade, roboticists have successfully applied the framework of synergies to create novel design and control concepts for artificial hands, i.e., robotic hands and prostheses. At the same time, robotic research on the sensorimotor integration underlying the control and sensing of artificial hands has inspired new research approaches in neuroscience, and has provided useful instruments for novel experiments.The ambitious goal of integrating expertise and research approaches in robotics and neuroscience to study the properties and applications of the concept of synergies is generating a number of multidisciplinary cooperative projects, among which the recently finished 4-year European project “The Hand Embodied” (THE). This paper reviews the main insights provided by this framework. Specifically, we provide an overview of neuroscientific bases of hand synergies and introduce how robotics has leveraged the insights from neuroscience for innovative design in hardware and controllers for biomedical engineering applications, including myoelectric hand prostheses, devices for haptics research, and wearable sensing of human hand kinematics. The review also emphasizes how this multidisciplinary collaboration has generated new ways to conceptualize a synergy-based approach for robotics, and provides guidelines and principles for analyzing human behavior and synthesizing artificial robotic systems based on a theory of synergies.     

变时基技术在汽车实验模态分析中的应用

实验模态分析是了解汽车动态特性的重要工具。文中介绍了用基于变时基技术的冲击激励实验模态分析对某改装汽车进行的分析。利用分析结果,对该汽车动态设计水平进行了评价。     

Quantification of the power changes in BOLD signals using Welch spectrum method during different single-hand motor imageries

Motor imagery is an experimental paradigm implemented in cognitive neuroscience and cognitive psychology. To investigate the asymmetry of the strength of cortical functional activity due to different single-hand motor imageries, functional magnetic resonance imaging (fMRI) data from right handed normal subjects were recorded and analyzed during both left-hand and right-hand motor imagery processes. Then the average power of blood oxygenation level-dependent (BOLD) signals in temporal domain was calculated using the developed tool that combines Welch power spectrum and the integral of power spectrum approach of BOLD signal changes during motor imagery. Power change analysis results indicated that cortical activity exhibited a stronger power in the precentral gyrus and medial frontal gyrus with left-hand motor imagery tasks compared with that from right-hand motor imagery tasks. These observations suggest that right handed normal subjects mobilize more cortical nerve cells for left-hand motor imagery. Our findings also suggest that the approach based on power differences of BOLD signals is a suitable quantitative analysis tool for quantification of asymmetry of brain activity intensity during motor imagery tasks.     

电机驱动器装配工艺技术

阐述了直流力矩电器驱动器的基本工作原理;给出了直流力矩电器驱动器的装配工艺流程,并对工艺流程中的重要环节做了较为详细的说明;总结了直流力矩电机驱动器的抗干扰措施及安装注意事项。     

异步电机参数的离线辨识实现

近年来,矢量控制在交流调速领域应用越来越广泛,但其控制性能受电机参数的准确性影响。本文旨在提出一套完整的离线辨识方案,检测电机参数,将其运用到交流调速实验平台。仿真和物理实验证明,该方法辨识速度快、精度高、实用性强。     

INVT变频器在恒压供水系统中的应用

本文设计了一个由Siemens S7—300PLC与英威腾（INVT）变频器组成的恒压供水系统。它由一台变频水泵、一台工频水泵、一台备用水泵组成,以PLC作为主控制器,实现系统的启动运行、制动控制、供水模式选择、水泵电机监控、电机故障报警以及故障电机切换等功能。该系统通过实时检测供水管网压力信号,根据压力值决定启动电机...     

福特汽车电子零部件EMC标准测试技术改进

从汽车电子零部件的测试项目、测试方法及测试装置等方面,对福特公司汽车EMC新标准EMC-CS-2009.1《电气/电子部件及子系统的电磁兼容性（EMC）要求》进行分析解读,最后给出新标准对实验室相关测试能力的新要求。