Power Transfer in DC Chopper Motor Drive

Under the guidance of the Electric Vehicle Demonstration Act, administered by the Department of Energy, Office of Transportation Programs, the energy efficiency of a dc chopper motor drive was investigated [1]. With the aid of a data acquisition system, data points were taken for a parametric load profile at multiple constant speed settings. The data points were used to determine motor performance when energized from a dc source; and to determine motor performance and heat loss when receiving energy from the propulsion battery through the dc controller. Power losses in the dc controller and the propulsion battery were also determined during the latter test run. The constant speed and parametric load torque performance data are converted into constant power/torque variable speed data and presented graphically.     

Design Analysis of Multiphase DC Chopper Motor Drive

DC chopper propulsion speed control is attained by a solid-state switch whose variable on-off duty cycle transfers a proportional quantity of pulsed energy into a motor. The pulsed battery current is alternately stored and expended within the dc motor and its series connected dc choke during each period of conduction and succeeding freewheeling operating mode. Hence an energy transfer is maintained transforming a high voltage low dc supply into a lower voltage higher dc demanding load. The transformation ratio is considered a controlled variable by simply controlling the on-off conduction duty cycle of its solid-state switch. This simplistic approach, however, fails to recognize that the instantaneous battery current amplitude equals the motor current demand during the switch ``on' period resulting in potentially very large peak power demands [1].     

斩波双闭环控制在内反馈串级调速系统中的应用

首先对内反馈斩波串级调速系统主电路及其工作原理做了介绍,通过控制斩波器的占空比就可以改变电机转速;其次采用了两种不同方法对斩波串级调速系统的斩波回路进行了建模和分析,并得到斩波双闭环控制结构图;最后,给出了实验波形和相关结论。     

Computer-Aided Analysis of a Multiphase Chopper-Driven DC Series Motor and Test Results on a Microprocessor-Based Three-Phase Chopper Drive

A comprehensive digital computer-based analysis using a state-space model which predicts the performance of a dc series motor controlled by a multiphase chopper is presented. The analysis is based on the formulation of system equations in multivariable state-space form and takes into account the nonlinear magnetization curve and the variation of field inductance with load current. The predicted results based on this analysis are shown to agree with the test results on a practical drive system developed for this purpose in which the dc series motor is driven by a microprocessor-based three-phase thyristor chopper. The control circuit development for the practical drive is briefly described.     

Rotor Chopper Control for Induction Motor Drive: TRC Strategy

A solid-state induction motor speed regulating scheme using a rotor chopper-controlled external resistor is investigated. This control scheme provides continuous and contactless variation of rotor resistance and thereby eliminates the undesirable features of the conventional rotor resistance control method. A thorough analysis of the steady-state performance of the system is presented. Both dc and ac circuit models are derived to describe the performance characteristics when the chopper operates under the time-ratio control (TRC) strategy. Effects of machine parameters on performance characteristics are studied. Theoretical results from the model are verified by comparison with experimental results. The torque?speed characteristic of this speed control system is essentially linear for a particular time ratio.     

基于CPLD的二相步进电机驱动设计

在选择合理电源波形的基础上,提出了一种基于复杂可编程逻辑器件(CPLD)的步进电机驱动系统,介绍了其设计原理和特点,并给出了具体的实现方案和应用结果.     

A Synchronous Thyristorized DC Motor Drive

A thyristorized dc motor speed control system using phase-locked loop principle is presented. Linear model analysis is given and control performance is studied in terms of system parameters using the root-locus technique. Practical design aspects are discussed, and experimental results obtained with a prototype system intended for a separately excited ?-hp dc motor are given.     

高性能低成本两相无刷直流电动机

开发的高性能低成本两相无刷直流电动机,以正交方波电压模式运行.样机的设计分析和试验结果表明:同传统两相无刷直流电动机相比,转矩密度高、功率密度高、转矩脉动小、成本低.     

New DC Chopper Circuits Using Fast-Switching Reverse-Conducting Thyristors for Low-Voltage DC Motor Control

Fast- switching reverse-conducting thyristors have been developed and used in dc chopper apparatus to control the speed of highvoltage dc traction motors. The newly developed dc chopper circuit and its application for low-voltage dc motor control are discussed. The fast-switching reverse-conducting thyristor is utilized as the main thyristor to control load current.     

一种新的无刷直流电动机驱动系统

提出了一种新的低成本四开关无刷直流电动机驱动系统。为了有效地利用该系统,设计了一种直接电流控制的脉宽调制(PWM)方案,以得到良好的动、静态的速度-转矩特性。该四开关变换器的可行性可推广到二相无刷直流电动机驱动以及用于功率因数校正和速度控制的六开关变换器。从理论上分析了该无刷直流电动机四开关变换器的工作原理,并通过仿真和试验演示了其性能。     

直接驱动无刷直流电动机的研究

跟踪国际洗衣机技术发展趋势,叙述新一代变频洗衣机驱动控制技术进展,介绍家用变频洗衣机直接驱动无刷直流电动机研究开发项目的研究结果。     

一种轻型大功率直流电机驱动器研制

针对功率质量比要求很高的功率驱动场合,提出了一种轻质量高功率的直流电机驱动器系统.驱动器电路的核心器件为一片CPLD和多片智能功率芯片SPM-IGBT.介绍了电路的硬件设计原理,描述了控制软件的程序结构.系统重量仅为1 kg左右,输出功率达7 kW;经实验表明,系统具有工作稳定、功耗低、体积小、可靠性高、控制灵活等特点,具有一定实用价值.     

双Buck ZVT-PWM电路在直流斩波器中的应用

分析了Buck ZVT-PWM电路的工作情况,并给出了双Buck ZVT-PWM电路的Matlab仿真波形;设计了以DSP为控制核心的驱动信号产生方法,并将该电路应用于斩波器中,以完成斩波器调速系统的双闭环控制。实验证明,当主开关管在零电压下开通时,变换器整体效率达91.2%,相对于单Buck变换器,其抗干扰性强,具有较高的实用价值。     

Four Quadrant AC-DC GTO Converter-Fed DC Motor Drive

In this paper, comparative study of two schemes of four-quadrant GTO converter-fed DC motor drive is carried out. The schemes considered are (i) a PWM GTO dual converter and (ii) a single PWM GTO converter with a static reversing switch. Both of them offer superior performances compared to conventional line commutated converter-fed DC motor drives. The performances of the two schemes are compared for the case of both open-loop and closed-loop speed control systems. The results are experimentally verified in the laboratory with a 3-hp DC motor.     

无刷直流电动机驱动系统的新型逆变结构

提出了简化的无刷直流电动机驱动逆变结构。新方案中，使用的功率开关管和续流二极管的数目均比传统的桥式逆变结构减少一半，并具有无直通优点。分析了两相和三相的简化逆变电路，并给出了数字仿真和样机实验结果。     

基于CPLD的有刷和无刷直流电动机混合驱动技术研究

充分利用可编程逻辑器件(CPLD)资源,研究了基于三相桥逆变器的无刷直流电动机(BLDCM)和基于H桥逆变器的有刷直流电动机的混合驱动技术,给出了总体设计、不同斩波方式及正、反转切换方法.仿真结果证明,混合驱动器集成度高,可消除组合逻辑竞争冒险,具有故障保护、控制方式选择和逻辑封锁等多种功能.     

多功能无刷直流电机驱动控制器的研制

该文设计了一个电路简单且易于扩展,可用于高压高速场合的无刷直流电机驱动控制器。该驱动器通过无刷直流电机专用芯片MC33035结合单片机PIC18F1220解决了采用自举电容技术得到的驱动器上桥臂电源所造成的电机启动问题并且实现了诸如软启动,制动,正反转等多种功能。实验表明,该系统运行稳定,可扩展性强,具有一定的应用价值。     

BE包装机直流电动机驱动系统

我厂BE卷烟包装机的主驱动采用的是直流电动机调速控制系统,由于直流电动机的结构复杂,其定子上有激磁绕组产生主磁场,对功率较大的直流电动机常常还装有换向极,以改善电动机的换向性能。直流电动机的转子上安放电枢绕组和换向器,直流电源通过电刷和换向器将直流电送入电枢绕组并转换成电枢绕组中的交变电流,即进行机械式电流换向。复杂的结构限制了直流电动机体积和重量的进一步减小,尤其是电刷和换向器的滑动接触造成了机械磨损和火花,使直流电动机的故障多、可靠性低、寿命短、保养维护工作量大。因此考虑将其主驱动的直流电动机调速控…     

无刷直流电动机驱动系统故障分析

对无刷直流电动机驱动系统的典型故障进行了研究;分析了功率开关管开路故障、短路故障以及霍尔传感器故障;并利用Simulink对故障进行仿真,分析了故障状态下的相电流,为无刷直流电机驱动系统的故障诊断提供了一种可行的故障特征提取方法.     

矩阵变换器驱动无刷直流电机仿真研究

在分析矩阵变换器(matrix converter,MC)拓扑结构的基础上采用基于虚拟直流环节的控制方式,结合无刷直流电机(brushless DC motor简称BLDC)三相6状态运行原理实现MC输出换相.提出了易于实现的PWM调制方式和换流策略,利用Matlab/Simulink建立MC驱动BLDC仿真模型,仿真结果表明文章提出的控制方式简单可行.