微型单相异步电动机逆序磁场的声学效应

讨论含有逆序磁场的径向力波对电磁声的影响。试验表明，逆序磁场为零与不为零两者声学效应的规律基本相同，微型单相异步电动机的电磁噪声与磁场椭圆度近似成正比。     

对异步电机Y-△降压起动控制线路的探讨

本文对由两个接触器换接的Y—Δ降压起动控制线路存在的问题进行了分析,并给出了改进后的线路。     

感应电动机数字仿真中的电感矩阵求逆新方法

根据三相感应电动机的电感系数矩阵为循环矩阵这一特点,利用循环矩阵的性质,导出了电感系数矩阵求逆的表达式。利用导出的公式编程求解三相感应电动机在相坐标系统中的状态方程,所用机时仅为普通方法的三分之一,基本上等于采用坐标变换后的上机时间。     

永磁同步电动机幅频特性分析

分析了水磁同步电动机带惯量负载情况下的幅频特性.从非线性传递函数理论出发,指出永磁同步电动机的幅频特性不仅与电机的参数有关,而用与给定信号有关.随着给定信号的增大,电动机系统的幅频特性曲线发生变化,表现出较强的非线性特点.最后,文中给出了相应的实验结果,验证了理论分析的正确性.     

充水式潜水电机的发展趋势

本文介绍了近年来国内外充水式潜水电机的发展情况 ,探讨了其发展趋势 ,并根据实践经验总结了改进潜水电机的方法     

On a Modification of the PID Controller

In this article we propose a modification of the PID controller. Theexpression for static error for systems with a modified controller isderived. We have obtained the parametric equations describing the boundariesof the asymptotic stability domain in the space of feedback gains. Theasymptotic stability domain for the system of second order with modifiedcontroller is derived. Some numerical results and example arepresented.     

Upper Limb Robot Mediated Stroke Therapy—GENTLE/s Approach

Stroke is a leading cause of disability in particular affecting older people. Although the causes of stroke are well known and it is possible to reduce these risks, there is still a need to improve rehabilitation techniques. Early studies in the literature suggest that early intensive therapies can enhance a patient's recovery. According to physiotherapy literature, attention and motivation are key factors for motor relearning following stroke. Machine mediated therapy offers the potential to improve the outcome of stroke patients engaged on rehabilitation for upper limb motor impairment. Haptic interfaces are a particular group of robots that are attractive due to their ability to safely interact with humans. They can enhance traditional therapy tools, provide therapy on demand and can present accurate objective measurements of a patient's progression. Our recent studies suggest the use of tele-presence and VR-based systems can potentially motivate patients to exercise for longer periods of time. The creation of human-like trajectories is essential for retraining upper limb movements of people that have lost manipulation functions following stroke. By coupling models for human arm movement with haptic interfaces and VR technology it is possible to create a new class of robot mediated neuro rehabilitation tools. This paper provides an overview on different approaches to robot mediated therapy and describes a system based on haptics and virtual reality visualisation techniques, where particular emphasis is given to different control strategies for interaction derived from minimum jerk theory and the aid of virtual and mixed reality based exercises.     

基于单片机MC68HC908的座椅后视镜电控系统的设计

本设计以MC68HC908单片机作为控制器,分别控制继电器和桥式电路驱动电机运动,从而控制汽车座椅和后视镜的运动,达到电动调节座椅和后视镜的目的。本文重点介绍了座椅以及后视镜电动系统的工作原理并给出了相关电路的设计。     

交流永磁同步电机控制器的设计与实现

介绍了矢量控制的原理,并运用TI公司的高性能数字信号处理器TMS320F2811进行三相永磁同步电机空间矢量控制器的设计;设计方案分为硬件设计和软件设计两个部分,硬件设计部分详细介绍了硬件系统设计方案,并提供了编码器电路、电流检测电路、过流保护电路;软件设计部分介绍空间矢量控制算法的设计与实现,对电流环和转速环的控制算法进行了详细说明;通过实践检验,该系统符合设计要求,具有控制精度高、反应速度快等优点.     

基于噪声模型的通风机房降噪控制

通过对煤矿通风机房噪声调查监测,提出利用通风机房噪声模型采取降噪措施,并将实际测量与理论计算值进行比较证明模型是正确的,措施是可行的。