微机控制直流电机及其激光图形显示系统

直流电机的工作方式比较多,但是如何有效地把它们设计成为图形显示器件却是一个比较复杂又很实用的课题;文中研究了一个利用微机控制三种直流电机工作的激光图形显示系统;使用了三种不同类型的电机:可逆电机、伺服电机和反应式电机;设计了基于计算机控制的偏振、旋转和步进三种直流电机工作方式,分析了利用微机控制直流电机来显示激光图形的软硬件工作原理,给出了图形的几何变换算法及程序流程;最后展示了部分输出结果图,取得了较满意的效果。     

Universal step-motor controller-indexer

A microprocessor-based controller for step motors is described. It is ‘universal’ inasmuch as the same unit can be used to control all types of permanent magnet (PM) and variable reluctance (VR) step motors. The system can also double up as a preset indexer that causes the step motor to cover a specified number of steps in the shortest possible time by automatically controlling its acceleration and deceleration.     

步进电动机原理及其驱动电路研究

步进电机是一种纯粹的数字控制电动机,又称为阶跃电机或脉冲电机。是一种受电脉冲信号控制的无刷式直流电动机,也可以看作是在一定频率范围内转速与控制脉冲频率同步的同步电动机。它能将输入电脉冲信号转换成机械的运动量加以输出。每一个主令脉冲都可以使步进电机的转轴前进一个步距角,并依靠它特有的定位转矩将转轴准确地锁定在空间位置上,在实际工程中有着广泛的应用,文章主要探讨了步进电动机原理及其驱动电路的特点。     

Modeling and dynamic simulation of multiple-stack variable-reluctance step motors

A mathematical model is developed to represent the dynamic behavior of multiple-stack variable-reluctance step motors. An unsaturated magnetic circuit is considered first, and the model is subsequently modified to include the effects of saturation in the iron parts. To illustrate the procedure, a typical three-phase, multiple-stack, variable-reluctance step motor is modeled. This model is also used to simulate the dynamic response of the step motor under several operating modes.     

步进电动机原理及其驱动电路研究

步进电机是一种纯粹的数字控制电动机,又称为阶跃电机或脉,中电机。是一种受电脉冲信号控制的无刷式直流电动机．也可以看作是在一定频率范围内转速与控制脉冲频率同步的同步电动机。它能将输入电脉冲信号转换成机械的运动量加以输出。每一个主令脉冲都可以使步进电机的转轴前进一个步距角,并依靠它特有的定位转矩将转轴准确地锁定在空间位置上,在实际工程中有着广泛的应用,文章主要探讨了步进电动机原理及其驱动电路的特点。     

Optimal closed-loop control of a hybrid step motor with chopper drive

Optimal closed-loop control of a hybrid step motor control with chopper drive is described. Expressions for the average torque and optimal control angle giving maximal average torque in the stationary state without phase current chopper control are presented. The effects of chopper current control on the torque and acceleration characteristics of a hybrid step motor are discussed. Expression have been developed for the control angle in the chopper current control mode, yielding greater torques and improved acceleration of hybrid step motors than for the optimal control angle without phase current control. The speed response of a hybrid step motor operated in a closed-loop system has been studied by computer simulation for different supply voltages and torque loads, using various control angle algorithms.     

基于旋转电弧传感的新型轮式自主移动焊接机器人系统

介绍了一种基于旋转电弧传感的新型轮式焊接机器人系统，机构上前轮采用步进电机转向，后轮由交流伺服电机驱动，左右与上下十字滑块用两个直流伺服电机控制，这4个电机用一4轴驱动运动控制器进行驱动控制，大大提高了集成度与控制效率，目前是一种新型的焊接自动化装备．     

基于Simulink仿真的步进电机细分控制分析

针对大视场视觉测量系统中标定物的高精度定位控制问题,研究二维转台的驱动电机细分控制方法.步进电机是一种数字控制电机,它将电脉冲信号转换成相应的角位移,具有快速启动和停止的能力.它每转一周都有固定的步数,在不丢步的情况下,其步距误差不会长期积累,仅与脉冲频率有关.为了提高转台的分辨率,对步进电机的步距角进行研究,分析了步进电机步距角实行细分的可行性,采用SPWM技术对步进电机相电流进行控制,在Simulink的环境下对步进电机建立数学模型并进行了分析.通过对步进电机的细分控制大大改善了其各项性能,可实现二维转台的高精度定位控制.     

具有参数和负载不确定性的感应电机自适应反步控制

基于磁场定向坐标系下的感应电机模型,采用自适应反步方法设计控制器,通过选择适当的Lyapunov函数来保证整个系统的稳定性．进而逐步导出控制律和参数自适应律．该方法可在电机参数发生变化和出现负载扰动的情况下,实现转速和转子磁链的渐近跟踪．仿真结果证实了该方法的有效性．     

Ripple reduction at speed and torque of step motors used on a two-axis robot arm

This paper presents the control of two axis robot arm. The system is consisted of two step motors, robot arm, computer and PIC16F84A. One of them controls the robot arm via parallel port of the computer. The other one controls end element on the arm by PIC16F84A. PIC16F84A drives the motor by the designed circuit drive. Although the control of the step motor is very easy, they work choppily. Therefore, it is necessary to reduce the ripples occurred at the speed and torque of the step motor. In this study, proportional–integral–derivative (PID) controller is used to reduce the ripples. The obtained results show the proposed method is very successful.     

电动汽车用驱动电机测试平台多功能电源系统

电动汽车的驱动电机可以选用直流电机、感应电机和永磁同步电机等,这些电机进行测试时所需的馈电系统不同,无法在同一实验平台上进行试验。为此,开发了一个共直流母线的电动汽车用驱动电机系统测试平台,该测试平台能在不同电源工作模式下对不同电机进行试验。重点研发了适用于电动汽车驱动电机测试的多功能试验电源,该电源采用了交直流共用主回路拓扑结构分时输出,三重化DC/DC的直流调制策略和SVPWM过调制的交流调制策略,使得驱动电机系统测试平台不仅具有较高的能量利用率,还能适用于多种不同类型的驱动电机测试。最后,实验证明了所开发的驱动电机系统测试平台的可行性。     

仿生机器人关节电机的分析与研究

随着仿生机器人的发展,实现蛇形机器人多形式越障运动,关节电机起关键作用。主要探讨了蛇形机器人关节电机的选择。可作为蛇形机器人关节的目前有四种电机可选:球形步进电机、舵机、伺服电机和步进电机。选用舵机作为关节电机,将很难克服堵转弊病,位置闭环系统以及体积问题也不适应蛇形机器人的力学情况;选用带减速的步进电机是较可行的方案。但选用步进电机必须解决解决三大问题:提高输出转矩,加大减速比;提高高压电源电压;解决电机外壳的散热。这三项都是行之有效的措施。     

基于STM32的多步进电机控制系统研究

在很多应用场合中,要求多台步进电机在运行目标距离不同的情况下,能同时启动、加速、高速、减速、制动停止。首先搭建了系统的主要硬件模块,在分析STM32产生PWM脉冲控制步进电机原理的前提下,提出了一种通过程序按照设定要求不断自动改变STM32中TIM预分频值的方法,实现多步进电机同步协调工作。然后对整个系统建立数学模型,通过理论分析和仿真验证,证明该系统能够满足所要求的性能指标。最后把该系统应用到实际环境中,通过对测量数据的分析,进一步验证了系统具有良好的稳态性能和动态性能。     

TMS320F28027与L298N的悬挂运动控制系统设计

介绍了由TMS320F28027和L298N模块以及编码器组成的悬挂运动控制系统。该系统通过控制2个步进电机,控制轴上线的收放来达到使悬挂物在平面内任意运动的效果,以实现画圆或指定图案和显示当前坐标等功能。主要介绍了步进电机的控制算法和利用TMS320F28027芯片实现位置闭环控制的方法。该系统具有高效、稳定、准确等优点。     

多光谱痕迹检测仪滤光片切换系统设计

多光谱痕迹检测仪是一种用于痕迹检测的警用仪器,滤光片切换系统是实现多光谱光源的重要组成部分.为了获取多光谱光源,需要对作用于光源的两组滤光片分别进行自动切换,应用单片机AT89C51提供控制和时序信号,采用步进电机驱动芯片L298驱动两个步进电机,实现两组滤光片的精确切换.运行实验表明,滤光片切换系统工作平稳、可靠.     

Dynamic equivalent method of interconnected power systems with consideration of motor loads

The existing equivalent methods usually only deal with static load models and neglect the dynamic characteristics of loads such as induction motors.This paper presents a dynamic equivalent method which considers motor dynamics.At first,the clustering criterion of motor loads is given.The motors with similar dynamic characteristics are classified into one group.Then,reduction of motors in the same group is carried out.Finally,parameters of the equivalent motor are calculated and the equivalent system is thus...     

电动汽车负载模拟加载系统

电动汽车的普及和推广对牵引电机的性能提出了新的要求。为了研究电动汽车直流无刷电机（BLDC）在复杂路况条件下的运行性能,提出了一种电动汽车负载模拟加载系统,推导了汽车牵引电机负载数学模型。基于时间等效的缩放思想,用小功率电机代替实际牵引电机作为系统的牵引电机,使该系统具有很好的可实施性。在MATLAB/simulink环境下建立电机和联轴器的仿真模型,负载电机通过联轴器对牵引电机进行实时加载,进而可以分析不同路况下电动汽车牵引电机的动态性能,为实际工程中整车实验提供动力方面的数据参考。     

Condition monitoring of speed controlled induction motors using wavelet packets and discriminant analysis

This work presents an intelligent method for the condition monitoring of induction motors supplied with adjustable speed drives (ASD). Most of the previous work in this area concentrated on the fault detection and classification of induction motors supplied directly from an a.c. line. However, ASD driven induction motors are widely used in industrial processes and therefore obtaining an intelligent tool for the condition monitoring of these motors is necessary in terms of preventive maintenance and reducing down time due to motor faults. Here 3-phase supply side current of the ASD driving an induction motor is used to extract statistical features of wavelet packet decomposition coefficients within a frequency range of interest. This way, the information regarding the output frequency of the ASD and hence the motor speed is not required. Six identical three-phase induction motors were used for the experimental verification of the proposed method. One healthy machine was used as a reference, while other five with various synthetic faults were used for condition detection and classification. Extracted features obtained from decomposition coefficients of different wavelet filter types for all motors were employed in three different and popular classifiers. The proposed method and the performance of the features used for fault detection and classification are examined at various motor loads and speed levels, and it is shown that a successful condition monitoring system for induction motors supplied with ASDs is developed. The effect of selected filter type in wavelet decomposition to the condition monitoring process is analyzed and presented.     

直线电机的发展及应用概况

介绍了直线电机的分类及特点,直线电机是一种将电能直接转换成直线运动,而不需要通过任何中间转换机构的新颖电机.阐述了直线电机理论分析和优化设计的研究手段和最新研究成果,分析了直线电机核心控制部件、外围输出通道、控制理论和控制技术发展状况,简要叙述了直线电机在工业、办公设备、交通、家庭自动化、军事装备等领域的的应用现状和动态.根据直线电机应用研究的发展趋势,指出在利用计算机提高直线电机的控制精度和依据新原理研制新型直线电机的新技术推动下,直线电机具有广阔的应用和发展前景.     

双驱动球形机器人的结构设计与分析

本文设计了一种球形机器人,它是通过重心驱动和角动量驱动来实现球体的滚动。机器人的动力部分主要由两个驱动电机和一个转向电机组成,三个电机处于同一水平面上。通过两个驱动电机实现了球形机器人前后向的运动,通过转向电机实现左右转向,包括原地的自转。