基于模糊PID的提升机低频制动系统设计及实现

介绍了矿井提升机制动要求,提出用低压变频器控制高压电机设计方案.低压变频器用于控制提升机实现低频制动时,需要控制变频器输出电压实现转矩控制,设计了模糊PID控制器,实现变频器的输出电压控制.给出了变频器低频制动控制系统结构,介绍了变频器软件程序的设计.试验结果表明,此低频制动系统具有较好的控制效果.     

全数字交—交变频器低频制动电压值的精确计算

论述了交流提升机采用全数字交－交变频器进行低频制动时低频电压值的计算方法。讨论了为保持电机最大转矩不变而低频供电时,定子绕组电阻压降对低频制动电压的影响。     

Vacon变频器在矿井提升机中的应用

详细介绍Vacon变频器在矿井中的应用,该方案中Vacon变频器作为特殊的低频电源,在保持输出频率不变的情况下,根据外部控制信号的要求和实际的运行速度,控制输出电压的大小,实现了矿井提升机高压电机减速段的平稳制动和稳定爬行,具有较大的实用和推广价值.     

通用变频器外接制动电阻的参数选择

通用变频器在对电动机进行快速制动时需要外接制动电阻.合理选择制动电阻可以在提高变频器稳定性的同时提高经济性.简要阐述了在机床电器控制中变频器选择外接制动电阻的基本原则和方法.     

变频器在矿井提升机中的应用

在矿井中的应用,变频器作为特殊的低频电源,在保持输出频率不变的情况下,根据外部控制信号的要求和实际的运行速度,控制输出电压的大小,实现了矿井提升机高压电机减速段的平稳制动和稳定爬行。     

利用变频器实现大惯量拖动系统准确停车

介绍了利用变频器直流制动功能实现大惯量变流拖动系统准确停车控制的设计方法,该方案的优点是省去了制动单元／制动电阻,从而有效的降低了成本。     

MM440闭环矢量控制解决卷扬机平稳制动问题

从卷扬机制动的问题和MM440变频器矢量控制的原理入手,介绍了75kW大功率卷扬机变频器控制系统由原来的开环控制改进为带编码器反馈的矢量控制技术改进方案,并着重介绍了调试过程中遇到的问题和参数设置的调整,较好地解决了卷扬机平稳制动问题,具有一定的参考价值。     

艾默生CT SP系列变频器在矿井提升系统中的应用

介绍了艾默生CTSP系列变频器的容量选择、外接制动电阻、控制回路的抗干扰措施及变频器的故障诊断与日常维护等。     

VACON变频器在提升机低频制动系统中的应用

针对提升机电机制动系统在应用时存在的问题,介绍VACON变频器在该提升机低频制动控制系统改造中的应用,对其控制方式、低频控制原理进行分析和说明,并对VACON变频器在提升机减速段平稳制动、稳定爬行效果进行总结。     

双微机控制的正弦波输出交—交变频器低频电源

本文论述了交──交变频器低频电源的工作原理,设计了MCS－8097、MCS－8098双微机控制的交—交变频器低频电源系统。讨论了正弦波输出的交—交变频器触发角的控制方案,实现了双微机控制的交—交变频器的低频控制,给出了实际运行波形。     

基于电动汽车半轴特性的电液复合制动协调控制方法

集中驱动式电动汽车的传动机构中,半轴特性会导致车辆紧急制动时利用电机进行车轮滑移率的精确控制变得困难。针对该类纯电动汽车,建立相应动力总成模型,在频域内分析电机制动力的传递特性及其对制动效果的影响;利用扩展卡尔曼滤波器进行半轴力矩的状态估计;提出两种车辆紧急制动工况下的电机—液压制动力协调控制方法,包括以液压制动为主、电机制动为辅的液压制动力动态控制方法以及以电机制动为主、液压制动为辅的半轴力矩补偿控制方法。仿真及台架试验结果表明,所提出的半轴力矩补偿控制方法可大大降低半轴特性对电机防抱死制动控制效果的不良影响,能够充分利用电机进行车辆的紧急制动;与传统摩擦制动防抱死控制相比,提升了整车制动效果,并降低了摩擦制动系统的要求。     

Rail brake system using a linear induction motor for dynamic braking

One type of braking system for railway vehicles is the eddy current brake. Because this type of brake has the problem of rail heating, it has not been used for practical applications in Japan. Therefore, we proposed the use of a linear induction motor (LIM) for dynamic braking in eddy current brake systems. The LIM reduces rail heating and uses an inverter for self excitation. We estimated the performance of an LIM from experimental results of a fundamental test machine and confirmed that the LIM generates an approximately constant braking force under constant current excitation. At relatively low frequencies, this braking force remains unaffected by frequency changes. The reduction ratio of rail heating is also approximately proportional to the frequency. We also confirmed that dynamic braking resulting in no electrical output can be used for drive control of the LIM. These characteristics are convenient for the realization of the LIM rail brake system. © 2011 Wiley Periodicals, Inc. Electr Eng Jpn, 178(2): 29–38, 2012; Published online in Wiley Online Library ( wileyonlinelibrary.com ). DOI 10.1002/eej.21209     

Application of dynamic braking to mine hoisting systems

Accidents occurred on counterweighted mine hoisting systems when the mechanical brake failed while the cage was empty. This allowed the counterweight to fall to the bottom of the shaft, causing the cage to overspeed and crash into the headframe. Direct-current hoist motors have the potential for preventing this type of accident by incorporating a passive electrical braking system known as dynamic braking. Installation of dynamic braking requires minimal control system modifications and modest expense. The various circuit designs that can be configured to implement dynamic braking on a DC mine hoisting system are discussed. Selection of the load resistance for the desired dynamic braking system performance is addressed. Data from tests of a mine hoisting system that was modified in the field to incorporate dynamic braking are analyzed, to provide technical credibility to the dynamic braking concept     

基于单元串联多电平高压变频器的异步电机直流制动研究

简单地介绍了单元串联多电平变频器的结构,详细地阐述了直流制动的原理和具体实现的方法。提出了在具体实现制动时应考虑的3个主要因素,通过改进的电压控制方法,抑制了制动电流冲击波的产生,能够有效平滑地进行直流制动。试验结果证明,采用直流制动功能是可靠和有效的。直流制动特别适合在低频段制动,所以很适合于风机起动前确保拖动系统从零速开始起动所需的制动场合。     

基于单元串联多电平高压变频器的异步电机直流制动研究

简单地介绍了单元串联多电平变频器的结构,详细地阐述了直流制动的原理和具体实现的方法。提出了在具体实现制动时应考虑的3个主要因素,通过改进的电压控制方法,抑制了制动电流冲击波的产生,能够有效平滑地进行直流制动。试验结果证明,采用直流制动功能是可靠和有效的。直流制动特别适合在低频段制动,所以很适合于风机起动前确保拖动系统从零速开始起动所需的制动场合。     

单相可逆电动机电子制动的研究与实现

文章介绍了单相可逆电动机的工作原理;分析了电磁抱闸制动与电子制动的优劣。设计了基于单片机的单相可逆电动机电子制动的驱动电路。给出了单相可逆电动机电子制动的控制时序。采用电子制动方案,省去了电磁抱闸制动方式的刹车机构,提高了电动机的制动频率和定位精度。     

电动汽车永磁无刷直流电机驱动系统低速能量回馈制动的研究

本文分析了由蓄电池洪电的逆变器－水磁无刷直流电机系统在作电动汽车动力时实现电气制动的方法，着重研究了当电机转速低于电机空载额定转速时电磁制动及能量回馈的原理．提出了一种低速能量回馈制动的简便控制方法、计算机仿真和样机实验结果表明，采用本文听提出的控制方法，可方便地实现电动汽车的低速电气回馈制动     

TRANSIENT ANALYSIS OF BRAKING MODE OPERATION OF INDUCTION MOTOR FED FROM A VARIABLE FREQUENCY SOURCE

ABSTRACT

The transient behaviour of a three phase induction motor in the braking mode is investigated when the motor is fed from a variable frequency source. Appropriate voltage and frequency conditions to ensure minimum stopping time for plugging as well as for the case when plugging is used in conjunction with regenerative braking are identified. A dynamic model has been developed using the theory of instantaneous symmetrical component and associated operational equivalent circut and therefrom the transient performance of the motor in both the cases are compared with that of the normal plugging.     

Constant Torque Operation of Induction Motors Using Chopper in Rotor Circuit

A novel control scheme is investigated for operating induction motors in the constant torque mode. The basic control schemes and analysis of the steady-state performance of the system are presented. Circuit models are used to predict the performance characteristics. A new dc dynamic braking method is proposed and studied that provides very fast braking. Experimental results are presented to verify the theoretical predictions and demonstrate the feasibility of the control schemes.