无位置传感器无刷直流电机的控制系统研究

本文主要介绍了一种无位置传感器无刷直流电机控制系统的硬件结构和软件系统,分析了无刷直流电机转子位置检测方法。该系统以PLC为核心监测转速的变化,采用3段式起动方法,并利用PLC串口和上位机进行通信。     

三相无刷直流电机调速系统的驱动设计

以TMS320F28335浮点型处理器为控制器,采用International Rectifier公司的IR2136作为驱动芯片,设计了三相无刷直流电机的驱动电路,实现三相无刷直流电机调速及正反转控制,其中包括电源模块、信号隔离模块、IR2136逻辑电路、三相全桥驱动电路及过流保护电路等.     

模糊PID消防机器人无刷直流电机驱动系统设计

传统消防机器人主要运用有刷直流电机和经典PID控制。提出一种将无刷直流电机和模糊PID控制算法相结合的电机驱动系统,为消防机器人提供低速大转矩驱动。通过建立无刷直流电机控制系统模型和模糊PID控制设计,在MATLAB/Simulink仿真环境下建立系统仿真模型。在仿真环境中将传统PID控制器和模糊PID控制器各项指标作对比,结果表明使用无刷直流电机并运用模糊PID控制器组成的消防机器人,具有良好的静动态性能、抗干扰能力及转速/转矩特性。为验证试验的可靠性,建立消防机器人实物模型,对机器人进行整体测试,表明模糊PID消防机器人爬坡、越障、爬楼梯能力强,具有实用价值。     

基于DSP的无刷直流电机无位置传感器控制的实现

在传统的无刷直流电机控制系统中,由于大多采用位置传感器来获取电机转子位置信号,导致电机体积增加,控制线路变得复杂,因而限制了无刷电机在恶劣环境中的使用。为了改善位置传感器使用带来的弊端,本文设计并制作了一个基于美国德州仪器公司(TI)的数字信号处理(DSP)芯片TMS320LF2407A为主控制芯片的无位置传感器的无刷直流电机控制系统。采用虚拟中性点提取电机反电动势过零点从而捕捉电机转子位置信号,电机启动采用三段式,逆变器的上桥臂使用脉宽调制(PWM)而对应的下桥臂恒定导通,电机调速采用速度-电流双闭环比例积分(PI)控制。研究结果表明,电机能够平滑稳定地启动,整个控制系统具有良好的动态和静态性能。该文的设计方法是行之有效的,具有较重要的工程实践借鉴价值。     

无位置传感器无刷直流电机无反转起动方法(英文)

为了实现无位置传感器无刷直流电机的无反转起动及平滑切换,提出了一种新的无位置传感器无刷直流电机起动及切换方法.该方法依据电机定子铁芯饱和效应,采用6个短时电压脉冲检测转子初始位置,可将转子定位在60°范围内,然后采用长短电压脉冲相结合的方式加速电机同时利用电流响应的变化动态检测转子位置,当转速上升到可以检测到反电势过零点时,关闭电机驱动电路,根据端电压波形和导通相之间的对应关系确定切换时刻,可将电机平滑切换至反电动势换相运行方式.样机试验结果验证了上述方法的可行性和有效性.     

无刷直流电机的控制系统设计

研究了基于单片机的永磁无刷直流电动机的速度控制系统，提出了基于C8051f330的控制方法。系统软件基于Keil C的编译环境的C语言方式。实验证明了该方法的可靠性。     

无刷直流电机及应用研究

本对无刷直流电机的基本原理进行了论述,分析了无刷直流电机的基本结构和转矩特性,介绍其控制原理和在伺服系统的典型应用。     

永磁无刷直流电机换相转矩分析

介绍了人工心脏轴流式血泵永磁无刷直流电机换相转矩脉动变化过程．根据影响电机换相转矩脉动的因素,给出了减小电机转矩脉动的解决方案,以使电机运行更加平稳．通过实验波形证实本结论分析正确,可以为电机减小转矩脉动作为参考．     

十二状态无刷直流电机控制研究

利用相序图,阐述了无刷直流电机两相三相轮流导通十二状态控制方法。借助Ansoft软件,对两相三相轮流导通十二状态控制法和两相导通六状态控制法进行了仿真分析,仿真结果表明,十二状态控制法,电机相电压更接近正弦波,电流谐波较小。利用75W电机进行了对比实验,实验结果显示十二状态控制法,电机电流接近正弦波形,而两相导通六状态控制法为梯形,十二状态控制法电机性能优于两相导通六状态控制法。     

Influence of PWM Modes on Commutation Torque Ripples in Sensorless Brushless DC Motor Control System

This paper introduces four PWM modes used in the sensorless brushless DC motor control system,analyzes their different influences on the commutation torque ripple in detail,and selects the best PWM mode in four given types to reduce commutation torque ripple of Brushless OC( BLDC) motors,Simulation and experimental results show that the selection is correct and practical.     

一种减小无刷直流电机转矩脉动的广角波控制方法

In order to deal with torque pulsation problem caused by traditional control method for brushless DC （BLDC） motor and to achieve high precision and good stability, a novel control strategy is proposed. Compared with the traditional control scheme, by using phase voltage as a control objective and making waveform of phase current approximately quasi-sinusoidal, torque ripple of BLDC motor is reduced from the original 14% to 3.4%, while toque is increased by 3.8%. Furthermore, by detecting zero-crossings of back electromotive force （BEMF） with non-conducting phases, sensorless control is realized. The new control strategy is simple. It can minimize torque ripple, increase torque, and realize sensorless control for BLDC motor. Simulation and experiments show good performance of BLDC motor by using the new control method.     

利用霍尔电流传感器提高电流测量精度

随着电力系统自动化水平的不断提高,人们对电力系统在线检测的精度要求越来越高．要有效提高电力系统的电流测量精度,可用霍尔电流传感器代替电流互感器,利用单片机对电路进行补偿和性能改善,并采用接地、屏蔽、滤波等物理方法排除电磁干扰。     

Characteristics analysis and parameters optimization for the grating eddy current displacement sensor

The grating eddy current displacement sensor （GECDS） for distance or position measurement used in watertight electronic calipers was described. The sensor relies on repetitive variation of inductance against displacement caused by the change of coupling areas between moving coils and static reflectors. The investigations focused on setting up and utilizing a computer model of the 3D eddy current fields and geometry to analyze causes of the production of measurement blind areas, and to investigate effects of the sensor parameters, such as axial gap between coils and reflectors, reflector length and reflector width on characteristics of the sensor. Simulation results indicated that the sensor has the smallest nonlinearity error of 0.15%, which agrees well with the experimental results.     

A novel topology for ripple-free inputting current techniques

A novel topology for ripple-free input current circuit is put forward in the paper. Compared to traditional EMI (electromagnetic interference) filter consisting of choke and capacitor, the ripple-free topology can reduce the converter's ripple current with the use of smaller component. The new ripple-free topology proposed in this paper does not need elaborate adjustment of the coupling coefficient as required by conventional ripple-free techniques, and is ripple voltage cancellation or isolation mode, which can attenuate the ripple further if the line impedance is considered. The theoretical prediction is confirmed by experimental results. Project supported by the Scientific Research Foundation for Returned Overseas Chinese Scholars, State Education Ministry     

Design and implementation of a position sensorless control method for brushless DC motors

Because brushless direct current (BLDC) motors have the advantages of a compact size, high power density, high efficiency, and long operating life time, they are widely used in many industrial products and electric traction systems. It is known that the BLDC motors have no brushes for commutation. They are commutated with electronically commutation. So, the rotor position information of the BLDC motors must be known to understand which winding will be energized according to the energizing sequence. In most of the existing BLDC motor drivers, rotor position information is detected by Hall effect sensors. This kind of mechanical position sensors will bring additional connections and costs, reliability decrease and noise increase. In order to improve the control performance and extend the range of speed regulation for BLDC motors, a position sensorless control method is proposed in this paper. In the proposed control method, rotor position information of the BLDC motors is detected from the back electromagnetic forces (back-EMFs) which are estimated by an unknown-input observer with line to line currents and line to line voltages. For the purpose of verifying the effectiveness of the proposed control method, a model is built and simulated on the Matlab/Simulink platform. The simulation results show that the speed regulation performance of BLDC motors is improved compared with using Hall effect sensors. At the same time, the reliability of the BLDC motors is improved and the costs of them are reduced because the position sensor is eliminated.     

实现温漂补偿的调频式电涡流传感器探头设计

从传感器探头材料的选择、线圈的大小及工作频率等方面综合考虑,设计了一种具有双线圈探头的调频式电涡流传感器,它能较好地抑制温度漂移,提高系统的温度稳定性．     

A novel voltage output integrated circuit temperature sensor

The novel integrated circuit (IC) temperature sensor presented in this paper works similarly as a two-terminal Zener, has breakdown voltage directly proportional to Kelvin temperature at 10 mV/℃, with typical error of less than ±1.0℃ over a temperature range from -50℃ to +125℃. In addition to all the features that conventional IC temperature sensors have, the new device also has very low static power dissipation ( 0.5 mW ) , low output impedance ( less than 1Ω), excellent stability, high reproducibility, and high precision. The sensor's circuit design and layout are discussed in detail. Applications of the sensor include almost any type of temperature sensing over the range of -50℃-+125℃. The low impedance and linear output of the device make interfacing the readout or control circuitry especially easy. Due to the excellent performance and low cost of this sensor, more applications of the sensor over wide temperature range are expected.