Direct torque control of brushless DC motor with nonidealtrapezoidal back EMF

In this paper a method of the torque control attenuating the undesired torque pulsation for brushless DC motor with nonideal trapezoidal back EMF is presented. It is the direct torque control method in which the applied output voltage is calculated from the reference torque and the torque of the previous step in the two-phase conducting period and in the commutation period considering the back EMF waveform. The time delay due to the calculation is compensated by the one step ahead current prediction. To measure the instantaneous torque ripple, a torque observer is constructed using a high precision encoder of 50000 pulse per revolution. The simulation and experimental results show that the proposed method reduces the torque ripple significantly and that it keeps the torque control dynamics as well     

A robust digital position control of brushless DC motor with deadbeat load torque observer

A method for the robust position control of brushless DC (BLDC) motors is presented. The linear quadratic controller plus load torque observer is used to obtain an approximately linearized robust BLDC motor system for an AC servo, using the field-orientation method. The gains are obtained systematically from a discrete state space analysis. The robustness is obtained without affecting the overall system response. The load disturbance is detected by a zero-observer of the unknown and inaccessible input, and is feedforward compensated without requiring noisy current information. The overall system is controlled using a microprocessor, and the performance of each control algorithm is compared with both the simulation and the experimental results for two types of machines, a BLDC motor and a brushless direct drive (BLDD) motor     

电动摩托车用无刷直流电机控制系统的设计

根据无刷直流电机的工作原理,设计了一种以PIC16F737单片机为控制核心的电动摩托车用无刷直流电机控制系统,给出了系统详细的硬件电路和软件设计方法,实现了电动摩托车定速和调速两种工作模式的选择。实验证明该设计方案控制电路简洁,器件少,成本低,保护措施可靠,提高了系统的控制精度,对无刷直流电机在其他领域的应用有一定的帮助和借鉴,具有广泛的现实意义。     

基于dsPIC30F3010的无刷直流电动机控制系统设计

针对电机应用场合、体积缩小与节约成本等诸多问题,采用反电动势过零点检测方法,设计了基于dsPIC30F3010芯片的无刷直流电机无位置传感器控制系统。分析了dsPIC30F3010外围电路,逆变及其驱动电路,反电动势检测电路,电流采样与过流保护电路,开发了主程序和中速事件处理程序,并给出了电机正常运行时端电压的波形。实验结果表明系统能够控制电机顺利起动,而且实现了电机正确的换相和正常运行,证明了系统设计的可行性。     

基于转矩误差极性的无刷直流电机四象限控制研究

针对无刷直流电机相电流闭环PID控制的控制参数复杂及转矩脉动大的问题,提出了一种基于转矩误差极性的无刷直流电机四象限控制方案。该方案通过在电流环采用设置电流滞环的控制方法,自动判断电机的运行状态及控制电路导通逻辑,从而控制电机正/反转的加减速运行。仿真结果验证了该方法的可行性和有效性,合理设置电流滞环环宽度能有效抑制转矩脉动。     

Commutation torque ripple reduction in brushless DC motor drives using a single DC current sensor

This paper presents a comprehensive study on reducing commutation torque ripples generated in brushless DC motor drives with only a single DC-link current sensor provided. In such drives, commutation torque ripple suppression techniques that are practically effective in low speed as well as high speed regions are scarcely found. The commutation compensation technique proposed here is based on a strategy that the current slopes of the incoming and the outgoing phases during the commutation interval can be equalized by a proper duty-ratio control. Being directly linked with deadbeat current control scheme, the proposed control method accomplishes suppression of the spikes and dips superimposed on the current and torque responses during the commutation intervals of the inverter. Effectiveness of the proposed control method is verified through simulations and experiments.     

采用C50x对无刷直流电机进行控制

无刷直流电机由于具有容易控制、无换向器、结构简单、转速高、效率高而得到越来越广泛的应用,各类专用芯片的不断推出又进一步推动了它的应用和发展。C50x是西门子公司针对无刷直流电机而推出的单片机控制芯片,内部具有硬件换相电路,简化了无刷直流电机控制器的硬件结构,增强了可靠性。C504可以控制一台电机,C508可以控制两台。本文以C504为例,介绍无刷直流电机控制调速系统的设计方法。     

四旋翼飞行器无刷直流电机调速系统的设计

提出了一种适用于飞行器上的无传感器型无刷直流电机的控制方案。采用ATmega8作为系统控制器,利用片内模拟比较器,通过比较电机非导通绕组的反电动势与虚拟中点电压得到过零点时刻,并延迟30°电角度作为电机换相时刻。利用MOS管设计了三相桥式驱动电路,采用单边PWM控制方式实现电机调速,采用三段式启动方法实现了电机的软启动。软硬件结合实现了MOS管自检、过流保护、欠压保护的功能,提高了系统的安全性。实验表明,调速系统性能良好,能正常驱动新西达2217外转子式无刷直流电机。     

无刷直流电机RBF磁场定向控制及监控系统设计

针对现有无刷直流电机转矩脉动抑制方法存在抑制效果不理想,或脉动抑制效果好但学习算法复杂,不利于推广的问题,将RBF神经网络与磁场定向控制相结合,选用Luminary 615微控制器和无刷电机专用芯片MC33035,设计了无刷直流电机磁场定向控制系统。并开发基于Visual Basic的配套电机上位机监控系统,能在低成本下实现转速等参数的图形化显示及电机参数等的设置。实验结果表明,所设计的无刷直流电机RBF磁场定向控制系统转矩脉动小、控制精度高。     

一种减少无刷直流电机转矩脉动的新方法

为了抑制永磁无刷直流电动机控制系统在换相过程中因电流波动引起的转矩脉动,提高系统效率及稳定性,提出一种基于控制换相电流的新方法.与传统方法相比,该方法以换相电流为研究对象,通过使关断相电流的下降率等于开通相电流的上升率采维持电流在换相期间的稳定,从而减少转矩脉动,它摒弃了传统方法中的以转矩为研究对象.实验结果表明,该方法在地铁屏蔽门的应用中取得良好效果,使电流波动减少8%,转矩脉动减少10%.     

无刷直流电机齿槽转矩抑制方法专利技术发展

在无刷直流电机中,齿槽转矩是由转子的永磁体磁场同定子铁心的齿槽相互作用而产生的磁阻转矩.齿槽转矩会引起输出转矩的脉动和噪声,影响位置控制系统以及速度控制系统,特别是低速系统的性能和精度.本文主要以VEN专利数据库以及CNABS数据库中的检索结果为分析样本,从专利文献的视角对无刷直流电机齿槽转矩抑制的技术发展进行了全面的统计分析,总结了与无刷直流电机齿槽转矩抑制相关的国内外专利的申请趋势、主要申请人分布以及针对无刷直流电机齿槽转矩抑制技术的分支发展做了一定的分析,并从中得到一定的规律.     

GA-based multiobjective PID control for a linear brushless DC motor

This paper presents a robust output tracking control design method for a linear brushless DC motor with modeling uncertainties. Two frequency-domain specifications directly related to the mixed sensitivity function and control energy consumption are imposed to ensure stability and performance robustness. With regard to time-domain specifications, the rise time, maximum overshoot and steady-state error of the step response are considered. A generalized two-parameters proportional, integral, and derivative (PID) control framework is developed via a genetic searching approach ensuring the specifications imposed. The proposed design method is intuitive and practical that offers an effective way to implement simple but robust solutions covering a wide range of plant perturbation and, in addition, provides excellent tracking performance without resorting to excessive control. Extensive experimental and numerical results for a linear brushless motor confirm the proposed control design approach.     

一种减少无刷直流电机转矩脉动的新方法

为了抑制永磁无刷直流电动机控制系统在换相过程中因电流波动引起的转矩脉动,提高系统效率及稳定性,提出一种基于控制换相电流的新方法。与传统方法相比,该方法以换相电流为研究对象,通过使关断相电流的下降率等于开通相电流的上升率来维持电流在换相期间的稳定,从而减少转矩脉动,它摒弃了传统方法中的以转矩为研究对象。实验结果表明,该方法在地铁屏蔽门的应用中取得良好效果,使电流波动减少8％,转矩脉动减少10％。     

基于FPGA的无刷直流电机控制器设计

针对现有直流无刷电机控制器设计方案的不足,提出一种基于FPGA平台的无刷直流电机控制器设计方案,采用FPGA设计电机转速、电流双闭环控制系统,系统硬件包括以FPGA为核心的控制电路和以电机为对象的驱动电路,系统软件采用Verilog HDL生成速度和电流采样模块、电机驱动换相模块、PWM生成模块等,同时在VGA上显示控制系统的运行状态。控制器测试实验结果表明,设计的控制器能使电机在启动后1 s内达到转速给定值,1 s后保持在稳态值的±2%内,表明该控制系统具有较高的控制精度和较好的稳定性。     

内模PID控制器在无刷直流电机调速系统中的应用

针对无刷直流电机中传统PID控制器参数调节复杂、对环境适应能力较弱等问题,在分析内模控制与经典PID控制的内部对应关系的基础上,综合其优点,设计采用了一种基于内部模型的PID控制器（简称IMC-PID）对无刷直流电机进行调速。在建立对象理论模型的基础上,通过对控制器在线仿真比较表明：针对本设计对象,基于内部模型的PID控制器不论在系统阶跃响应或是扰动跟踪等控制效果上都能到达经典PID控制的要求,同时还降低了参数设计的复杂性和随机性。     

无刷直流电机的模糊PID控制系统研究

直流无刷电机效率高,转矩大,维护方便,广泛应用于工业过程的各个方面。提出了一种基于模糊PID控制的直流无刷电机调速系统并与传统的PID调速系统进行比较。运用传统的PID调速方法,参数不容易整定并且不容易得到满意的控制特性。由于模糊控制能够满足人们对控制特性的要求并且参数易于调整,因此设定了模糊PID控制器,对直流无刷电机进行调速。实验结果表明与传统PID控制相比,模糊PID控制的电机转速相应快,无超调,转速波动小,调节时间短,转速波动小,其性能明显优于传统PID控制,具有优良的静态性能和动态性能。直流无刷电机的建模,控制和仿真都在MATLAB/Simulink软件上进行。     

Application of model-based fault detection to a brushless DC motor

In comparison to classical DC motors, brushless DC motors are very reliable, Nevertheless, they can also fail, caused by, e.g., overheating or mechanical wear. This paper proposes a parameter estimation technique for fault detection on this type of motor. Simply by measuring the motor's input and output signals, its parameters can be estimated. This method is based on a mathematical model of the process. In the presented work, a square-wave motor is considered. An appropriate model is derived. To be able to implement the method also on low-cost microcontroller-based control units, only the power inverter supply voltage, DC current, and the motor's angular velocity have to be measured. The parameter estimation technique provides information about the electrical resistance and the back-EMF constant as well as about the mechanical parameters. Comparing the nominal with the computed parameters, faults can be detected. The approach might be applied to both end-of-line and online fault detection. Results for simulated data demonstrate the capabilities of the proposed procedure. Finally, a real-world application-an actuation system with a brushless DC motor mounted to a gearbox-is given     

基于TMS320F2812无刷直流电机控制系统设计

设计一种基于TMS320F2812的无刷直流电机控制系统;详细介绍了转子位置检测电路、相电流检测电路、驱动电路以及保护电路设计;给出相应的硬件电路.该系统采用三环控制.其中,位置环采用PI调节器;速度环采用参数自整定模糊PID控制:电流环采用电流滞环控制.该设计方案电路简单,可靠性强,具有较高的应用价值.同时,实验结果也验证了该方法的有效性.     

船载卫星天线中无刷直流电机控制系统设计

在船载卫星天线系统中,需要电机不停地驱动抛物面天线的支架,使得天线快速、准确地对准卫星并且指向始终保持稳定。以DSP芯片(TMS320LF2812)和专用集成芯片(A3936)为核心设计了全数字的无刷直流电机控制系统及硬件电路,并将模糊PID控制算法应用于该硬件系统中。实验结果表明,该方法既能快速地使天线对准卫星,又能满足精度的要求。