电机控制集成电路的选用 第十八讲 二要步进电机驱动集成电路SAA1042的应用

1　特　点SAA1 0 4 2是美国 MOTORLA公司生产的双极式的二相步进电动机驱动集成电路。有两种规格 :SAA1 0 4 2　　　　 6 V,1 2 V,5 0 0 m ASAA1 0 4 2 A　　　　 2 4 V,5 0 0 m ASAA1 0 4 2 /SAA1 0 4 2 A具有如下功能特点 :(1 )内置抑制过电压的钳位二极管。(2 )逻辑电压范围宽。(3 )可进行正转 /反转和全步 /半步控制。(4)输入端与 MOS、TTL及 DTL系列等常用的集成电路相兼容。(5 )驱动级偏置可使电机效率优化。2　引脚及内部结构SAA1 0 4 2内部主要有 :3个输入端 ,1个逻辑电路 ,2个驱动输出级。3个输入端分别为时钟脉…     

电机专用集成电路的应用 六：直流电机位置控制专用电路

与步进电机不一样,直流电机用于定位系统时,必须采用位置闭环,也就是说,必须组成一个位置定位控制系统,直流电机仅仅作为一个被控的执行元件。系统一般由电机电流控制环、电机速度控制环、电机位置控制环等组成。其中电机电流控制环用于调节电机的输入电流来控制电机的运转速度,对于不是很微小的电机而言,目前均采用脉宽调制(PWM)方式。电机速度控制环实际上是一个速度调节器,它将速度指令信号与实际速度信号比较后得到的误差信号经处理(通常是P调节)生成电流指令来控制电机电流。电机位置控制环主要用于检测电机实际转动位置后产生电机升降速度信号,用来使电机快速、精确地定位。无疑,位置控制环采用何种控制模式是最重要的。现代高效的、精确的位置控制模     

电机控制集成电路的选用：第九讲 直流电刷电机控制器IPIC2101

1　特　点TPIC2 1 0 1是一种用于直流电刷电机控制的单片集成电路 ,主要用来产生用户可调、固定频率、可变占空比的脉宽调制 ( PWM)信号 ,以控制直流电机的转速 ,也可用于控制其它负载的电源。它可接收0 %～ 1 0 0 % (占空比 )的 PWM信号 (自动方式 )或 0～ 2 .2 V电压差 (手动方式 ) ,并由内部调整正确的工作方式以接受不同的输入类型。另外该芯片有很强的保护功能 ,具有睡眠、运行和故障三种工作状态。TPIC2 1 0 1在性能上具有以下几方面的特点 :　　 ( 1 )具有 0 V到 1 6V,最大 50 m A的 PWM驱动输出。( 2 )具有双路速度给定输…     

电机控制集成电路的选用：第十三讲：微型电机驱动控制芯片MAX1749的应用

主要介绍了小型直流电动机驱动控制芯片MAX1749的应用,阐述了该芯片的内部结构、工作特点以及其独特的控制功能,给出了该芯片典型应用电路图并加以说明。     

电机控制集成电路的选用第五讲直流电机PWM控制芯片UC3637的选用

１　概　述ＵＣ３６３７是直流电动机脉宽调制（ＰＷＭ）控制器。该集成电路适用于开环或带测速发电机反馈的闭环直流电动机的速度控制,内部产生一个模拟误差电压信号,输出两路ＰＷＭ脉冲信号,这两路信号与误差电压信号的幅值成正比,且与极性相关,可构成双向的调速系统。该控制器还可以用于其它电动机的ＰＷＭ控制,例如无刷直流电动机ＰＷＭ速度控制、位置控制和步进电动机电流细分控制。２　特　点（１）单电源或双电源工作。（２）双路ＰＷＭ信号输出。（３）有限流保护功能。（４）具有欠电压保护功能。（５）有温度补偿功能。（６…     

电机控制集成电路的选用第十七讲 2极步进电动机驱动集成电路A3796的应用

主要介绍2极步进电动机驱动集成电路A3796的应用，阐述了该芯片的内部结构、工作特点以及其独特的保护功能，给出了该芯片的典型应用电路并加以说明。     

第十九讲 电机控制集成电路的选用二相步进电机驱动电路SAA1042的选用

MOTOROLA公司生产的SAA1042芯片用来控制并驱动二相步进电机，文中对其主要特点，引脚功能，技术指标，典型应用等作了介绍。     

电机控制集成电路的选用第一讲 步进电动机驱动芯片MTD2005的选用

１概述步进电机具有步距准确、可开环控制、便于数控等优点,因此被广泛应用于计算机终端、智能仪器的输出设备上。而步进电机的性能在很大程度上取决于驱动电路,把驱动电路集成化是提高电路性能的最好的手段之一。本文介绍一种高性能的步进电机驱动集成芯片——ＭＴＤ２...     

Short circuit protection of energy efficient motors

Many years ago, the National Electrical Code established a maximum setting for this instantaneous trip breaker of seven times motor full load amperes (FLA), the theory being that that value was just above the typical 6X locked rotor current. In a 1986 IEEE IAS paper Scheda noted that the two most commonly encountered problems in applying high-efficiency motors are (1) replacing a standard motor with a high-efficiency motor, and (2) the need to use thermal sensors on larger machines since higher settings for electronic control would violate the NEC. His paper concludes: “It is suggested that work be done in the industry and standards organizations to serve the needs arising from the use of electronic detection of instantaneous currents for motor protection.” This article addresses some of the work done in the industry to serve these needs and, in particular, how the use of an “electronic detection” inverse time circuit breaker can be appropriately applied when an instantaneous trip breaker would nuisance-trip     

Determining parameters of equivalent circuit of frame insulation in traction motors

The determination of a set of parameters that characterize a mathematical insulation model and its equivalent circuit according to the processes that take place in insulation, particularly according to the self-discharge voltage, is considered. A three-layered equivalent circuit is shown to be most suitable for analyzing processes that take place in the frame insulation of traction electric motors.     

磁网络模型在两相激磁开关磁阻电机中的应用

针对两相激磁开关磁阻电机（TPESR电机）初始设计中采用有限元方法速度太慢的问题,建立了TPESR电机的非线性变结构等效磁网络模型以提高设计效率,提出了一种气隙磁导的计算方法和局部饱和的处理技术。利用该模型对TPESR电机进行了磁场特性的分析,并且和有限元计算及试验结果做了比较。结果证明,磁网络模型的计算速度要远高于有限元,而精确度基本满足要求．适于进行电机初始设计。     

High-performance control of synchronous reluctance motors

Based on a (d,q) synchronous frame, the control problems of synchronous reluctance motors are outlined. In particular, the effect of magnetic saturation, core loss, and angular measurement errors of various types are evidenced. A flux-observer-based control scheme, capable of overcoming most of the above problems, is proposed. The proposed control has been implemented on a prototype drive, adopting a 17-N·m 8000-r/min motor. The experimental results show quite a good performance, with particular emphasis on those applications which require a large constant-power speed range     

High-precision torque control of reluctance motors

The high-precision torque control of a reluctance motor for servo applications is described. The prototype is a three-phase, eight-pole reluctance motor driven by a MOSFET inverter. The current control and the speed control are performed by software of the digital signal processor TMS 32010. The motor is supplied by sinusoidal current, and two current control methods are proposed. One is based on a vector control principle to achieve the linearity between current and torque, and another is developed to obtain the maximum torque/current ratio. Due to the saliency, the instantaneous torque contains a large ripple component. In the case of the test motor, the torque ripple was as much as 26% of the rated torque under sinusoidal current drive. The experiment showed that the ripple component could be reduced to 6% by superimposing a compensation current component on the current reference     

Microstepping control of ultrasonic stepping motors

The ultrasonic stepping motor (USSM) using spatially shifted standing vibrations shows the advantages of high torque, good controllability, and open-loop operation. Due to the segmentation problem of piezoelectric materials, the corresponding step size is practically limited. The purpose of this paper is to propose and implement microstepping control of this USSM. Different from the available half-step operation, the proposed control simultaneously varies both the combination of phase excitations and the magnitude of applied voltages in such a way that the desired step size can be attained. Digital implementation and experimental verification are given to validate the proposed microstepping control.     

感应电机并联运行矢量控制系统仿真研究

针对两台并联电机参数和负载不平衡的情况,在单台电机矢量控制数学模型的基础上,建立了两台并联感应电机在d-q坐标系下的数学模型,给出了基于平均转子磁通进行定向的矢量控制策略,利用定子电流的q轴分量控制两台电机的平均转矩,d轴分量兼顾控制平均转子磁通和偏差转矩。仿真结果表明,系统具有较好的动态、稳态性能。     

异步电机弱磁区转矩最大化策略

异步电机工作在弱磁区时,转矩随着转速的升高急剧下降,在转子磁场定向系统中,充分利用电机和逆变器的最大电压、电流限制,无需d轴电流控制器,通过调节q轴分量,稳定高速失步状态,实现弱磁区转矩最大化。异步电机在电压极限状态遇到干扰时,通过旋转定子电压矢量产生动态电压边缘,提高系统的瞬态响应。当异步电机运行在弱磁区,铁损增大,影响电机的磁链水平和转矩输出,引入铁损补偿机制,确保弱磁区的转矩最大化。仿真和实验证明,该控制系统能实现异步电机弱磁区转矩最大化,且具有很强的鲁棒性。     

Vector control of permanent-magnet synchronous motors

Schemes and algorithms are considered for vector control of a permanent-magnet synchronous motor by adjusting the stator-field vector magnitude and its angular misalignment relative to the rotor-field vector. The proposed algorithms provide a very varied view of motor mechanical characteristics, demonstrate low sensitivity to the dispersion of engine parameters, use a relatively small amount of computational procedures, and make it possible to implement quite easily a variety of static and dynamic drive operating regimes, including the modes of direct-current control, start, reverse, and others. Simulation results of the drive operation in static and dynamic regimes are given.