无刷直流电机STC12C5410AD单片机控制系统

基于STC12C5410AD单片机的特点,本文重点讲述了利用STC12C5410AD单片机控制有位置传感器无刷直流电机的换相、正反转、PWM调速、电流反馈的实现方法。     

基于STM32的无感无刷直流电机控制系统设计

提出一种基于STM32F407主控芯片的无位置传感器无刷直流电机控制系统设计方案,使用单片机系统对端电压进行采样,并在主控芯片中处理过零信号代替硬件过零点检测电路,分析AD采样误差导致过零点检测错误原因并给出修正方法。考虑电感续流对换相点相位影响,提出换相点校正方法并对系统加以补偿。实验表明,该系统控制电机时启动平稳、转矩输出平稳,可为无刷直流电机控制提供一定参考。     

基于DSP_F2812的BLDCM无传感器控制研究

分析了无刷直流电机数学模型,对无刷直流电机无传感器控制的三段式起动与反电动势过零点换相技术做出研究。利用电机三相端电压与反电动势间关系来确定电机反电动势过零点与换相点,提出了基于三相反电动势的改进型反电动势过零点换相方法。设计了基于DSP_F2812的无刷直流电机控制平台。通过实验验证表明,基于三段式起动与改进型反电动势过零点换相方法的BLDCM无位置传感器控制达到了带霍尔传感器换相控制的精度与效果。     

基于STM8S903K3的纯电动车实用控制器设计

影响电动车成本和性能最重要的因素有:控制器、电机、蓄电池。以STM8S903K3为主控芯片,设计出一款用于控制无位置传感器无刷直流电机的纯电动车控制器来降低电机成本、提高控制器稳定性。首先给出电动车控制系统总体结构框图,然后详细讲解了系统主要模块的电路原理图和软件流程图。通过软硬件结合法来确定无位置传感器无刷直流电机换相时刻。在雅迪电动车上的测试结果证明该控制器能很好的控制无位置传感器无刷直流电机的运转。     

基于DSP的无刷直流电机新型转矩脉动抑制策略

无刷直流电机在换相时,非换相相绕组电流会产生脉动,绕组电流的脉动会引起输出转矩的脉动;研究无刷直流电机换相转矩脉动问题,是为了获得无刷直流电机更优的转矩输出特性,提高控制系统的稳定性和控制精度;通过分析换相转矩脉动的成因,在传统PWM_ON_PWM三相全桥调制方式的基础上,加入新型相电流预测控制算法,调节关断相和开通相电流下降和上升的速率,从而抑制相电流的脉动;利用DSP实现算法,验证了算法的可行性,通过实验数据和波形的对比分析,PWM_ON_PWM调制策略与电流预测算法相结合的控制算法可以有效抑制换相引起的转矩脉动。     

无位置传感器的无刷直流电机控制方法及控制系统

本发明涉及一种无位置传感器的无刷直流电机控制方法及控制系统,涉及无刷直流电机控制领域,本发明的方法是一种端电压大小逻辑换相法,该方法根据三相绕组端电压的大小得出三相绕组进行换相的逻辑规则,通过采集转子三相绕组端电压信号,输送到DSP控制器,由DSP控制器分析三相绕组端电压之间的大小关系,根据得出三相绕组换相的逻辑规则,控制电机绕组自动换相,实现电机的起动,使电机在各种速度下均能稳定运行。解决了现有无位置传感器的无刷直流电机控制方法对系统精确度要求较高,控制过程复杂,而且在低速时控制效果差、无法实现电机启动的问题。     

无刷直流电机转矩脉动抑制研究

在电力电子技术发展的研究中,无刷直流电机系统具有转矩电流比高、转速高、动态性能好、可靠和易于控制等优点,在中小功率驱动场合应用广泛;但缺点是换相转矩脉动大,一定程度上制约了无刷直流电机的应用。为提高电机精度和稳定性,针对无刷直流电机换相转矩脉动的问题,采用补偿方法,分析了HPWM-LON调制方式对无刷直流电机换相转矩脉动的影响,提出了一种直接面向转矩脉动的补偿方法,建立了Psp ice仿真模型,通过对仿真结果的分析和比较,得出了这种转矩脉动补偿方法能有效的抑制转距的脉动,提高性能精度,消除了转矩脉动产生的噪音。     

基于ML4428的无刷直流电机无传感器的控制

介绍了目前常用的无位置传感器无刷直流电动机的控制策略,分析了反电势检测换相原理以及ML4428的功能、参数设定及应用。ML4428无传感器平滑启动无刷直流电机PWM控制器是一种较理想的无刷直流电机驱动器件。     

旋转变压器—数字转换器AD2S90在无刷直流电机换相？…

提出了旋转变压器－数字转换器ＡＤ２Ｓ９０在高速航空无刷直流电机换相控制中的应用。在对ＡＤ２Ｓ９０芯片性能分析的基础上,重点介绍ＡＤ２Ｓ９０与电机数字控制专用处理器ＴＭＳ３２０Ｆ２４０的接口电路和无刷直流电机换相的实现方法等问题。     

基于ML4428的无刷直流电机无传感器的控制

介绍了目前常用的无位置传感器无刷直流电动机的控制策略,分析了反电势检测换相原理以及ML4428的功能、参数设定及应用.ML4428无传感器平滑启动无刷直流电机PWM控制器是一种较理想的无刷直流电机驱动器件.     

A new approach for commutation torque ripple reduction of FPGA based brushless DC motor with outgoing phase current control

Brushless Direct Current Motor (BLDC) has been deployed across several kinds of applications. However, attaining a smooth torque ripple with fast response is relatively tough, as usually this is based on the varied slew rate line current in the commutation period. Hysteresis Current control has been widely used in earlier works for the maintaining incoming and outgoing phase current at the same rate throughout the commutation period. Additionally, this also helps in reducing the commutation torque ripple and delivers successful commutation. The proposed work here uses a relatively simple control technique that is primarily derived on the basis Outgoing-phase Current Discharge Hysteresis Control (OCDHC). This has been characterized to produce low response time and reduced torque ripple which has been suggested to execute in both conduction and commutation intervals. For the implementation of digital controller, we chose Xilinx Spartan 6 FPGA board. The digital controller algorithm is written using VHDL and is dumped on the FPGA. For this purpose we use Xilinx ISE and iMPACT tools. FPGA receives hall sensor output and current from BLDC motor with reduced torque ripple and generates the gate pulses which drive the IGBT switches using OCDHC control. This condition shows that the performance of the system is not primarily based on the motor parameters, excluding the stator resistance. Lastly, results obtained from the simulation and experimental results validate the significance of the proposed control technique based on response time at load conditions that vary at different junctures.     

Feedback linearizing control of switched reluctance motors

Motivated by technological advances in power electronics and signal processing, and by the interest in using direct drives for robot manipulators, we investigate the control problem of high-performance drives for switched reluctance motors (SRM's). SRM's are quite simple, low cost, and reliable motors as compared to the widely used dc motors. However, the SRM presents a coupled nonlinear multivariable control structure which calls for complex nonlinear control design in order to achieve high dynamic performances. We first develop a detailed nonlinear model which matches experimental data and establish an electronic commutation strategy. Then, on the basis of recent nonlinear control techniques, we design a state feedback control algorithm which compensates for all the nonlinearities and decouples the effect of stator phase currents in the torque production. The position dependent logic of the electronic commutator assigns control authority to one phase, which controls the motion, while the remaining phase currents are forced to decay to zero. Simulations for a direct drive, single link manipulator with the SRM are reported, which show the control performance of the algorithm we propose in nominal conditions and test its robustness versus the most critical parameter uncertainties of payload mass and stator resistance.     

基于DDS的旋转变压器接口电路设计与实现

针对21BRCX旋转变压器的设计要求,采用FPGA控制DDS芯片AD9850实现对励磁信号的产生,同时,通过AD2S90芯片,实现对旋转变压器信号的控制系统信息的转换。实验结果表明,该方法能够较好地实现旋转变压器21BRCX的接口电路的设计与实现。     

同步串行SPI在AD7888与AT90S8515接口中的应用

在高速串行模数转换器AD7888与AVR单片机AT90S8515的接口中采用同步串行接口SPI技术，实现起来十分方便。本文介绍了AD7888的特点，以及AT90S8515中SPI的实现，并给出了连接图和相应的程序。     

Commutation Torque Ripple Suppression in Three Phase Brushless DC Motor Using Open-end Winding

Three phase brushless DC motor has the characteristics of high power density, simple structure and excellent speed regulation performance, which is widely used in the field of electric drive. Open-end winding brushless DC motor has no neutral point, and each phase winding is electrically isolated, which can realize the independent control of each phase winding. Compared with Y-connected brushless DC motor, the open-end winding brushless DC motor has a wider range of speed regulation under the same voltage, and has certain fault-tolerant performance, which is suitable for the application of low voltage and large current. Compared with the multiphase fault-tolerant motor, open-end winding brushless DC motor has simpler structure and higher winding utilization rate. However, the open-end winding brushless DC motor still has torque ripple, among which the cogging torque is related to the motor body structure, while commutation torque ripple is affected by the mutual inductance of the winding and the current freewheeling loop. The commutation process of the open-winding brushless DC motor is analyzed, and it is concluded that the current change rates of the turn-off phase and turn-on phase are equal under the ideal back electromotive force(back-EMF), which can ensure that the non-commutation phase current and the electromagnetic torque kept constant. The overlapping commutation with phase current closed-loop method is proposed to suppress the commutation torque ripple of open-end winding BLDC motor, and the applied voltage on turn-off phase and delayed time of turn-off phase in overlapping commutation are derived, the sliding mode observer is used to calculate the electromagnetic torque. MATLAB simulation and experimental results verify the effectiveness of this method.

     

An effective method to obtain commutation positions in BLDC drive mode

The widely adopted drive method for the spindle motors with sinusoidal back-EMF in hard disk drive is to inject current into two phases and use the third phase to detect the rotor position. The commutation position to switch phases is normally 30 electrical degrees after the zero crossing points (ZCPs) of the silent phase back-EMF. To minimize the current ripple and thus the torque ripple, the commutation positions should be accurate and less prone to ZCP jitters. In this paper, an effective method based on the flux-linkage increment (FLI) is presented to realize accurate and robust commutation position detection. This method can greatly reduce the commutation position jitter even with obvious ZCP error. Experimental results show that the FLI method work well over a large speed range.     

A new fuzzy logic estimator for reduction of commutation current pulsation in brushless DC motor drives with three-phase excitation

Under the operation of brushless DC motor with three-phase excitation, commutation current pulsation is produced at each commutation at high-speed region. As it can be eliminated when the current slew rates are made equal, a simple and effective fuzzy logic estimator (FLE) is presented first time in the literature to reduce such current pulsation. Its function is to simply regulate the commutation angle accurately to maintain the same current slew rates of commutated phases during commutation, thereby keeping the other phase current unchanged. Unlike previous studies, the presented method does not require torque observer or detection circuits for sensing commutation interval, in addition to commutation time calculation. A genetic algorithm is employed for optimal definition of the FLE’s rule base. The presented method is tested by the accurate simulation, and it is proved that the proposed method is quite capable of reducing the commutation current pulsation and improving the motor output power.

     

基于递归神经网络定子磁链观测器的凸极同步电动机直接转矩控制系统

针对传统的凸极同步电动机直接转矩控制系统定子磁链观测器存在积分器漂移等问题,提出了一种基于递归神经网络定子磁链观测器的凸极同步电动机直接转矩控制系统的设计方案。该方案将三相电压与三相电流经3S/2S变换后得到的两相电压与电流送到已经训练好的基于递归神经网络的定子磁链观测器中,观测器的输出是定子磁链的α、β分量,即Ψsα、Ψsβ;Ψsα、Ψsβ经矢量分析器处理后得到定子磁链的幅值以及定子磁链的空间位置角,从而可准确得到定子磁链所在的扇区。仿真结果表明,与基于传统的U-I模型的凸级同步电动机直接转矩控制系统相比,该系统具有优良的动、静态性能。     

基于XC164CM的一种直流无刷电机控制新方法

介绍一种用Infineon 16位专用单片机驱动无传感器直流无刷电机的新方法,它在PWM导通期间对电机端电压进行采样检测,判断绕组反电势过零点的到达时间,并通过简单的线性运算进行误差校正,推算三相功率器件的换向导通时间。实验证明,这种方法检测精度高、抗干扰能力强,硬件检测电路简单,实现容易。     

基于转矩分配函数的开关磁阻电机的效率优化方法

开关磁阻电机使用传统的转矩分配函数(TSF)控制时虽然可以起到一定的抑制转矩脉动的作用,但却由于换相阶段电流峰值过高,电流可控性下降等问题使得其在换相阶段出现较为明显的转矩脉动,以及较高的铜耗。针对这一问题,提出了一种基于TSF的开关磁阻电机的效率优化方法。将电机特性作为约束条件,以铜耗为优化目标建立最优化模型,利用多重嵌套的遗传算法将该最优化模型应用于Simulink仿真中,得到不同参数下最优的电流参考曲线。再根据不同转速下对电机性能的需求,进一步筛选权重参数,从而得到最优的电流参考曲线。仿真和实验结果表明,该方法能够有效地降低换相阶段的电流峰值、降低电流控制难度,进而在较低转速下抑制转矩脉动、在较高转速下提高效率。