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无传感器BLDCM位置检测的一种单片机软件实现方法 总被引:1,自引:0,他引:1
针对无位置传感器无刷直流电机的位置检测问题,本文应用单片机成功地实现了一种软件检测方法,并给出了实测波形加以验证。 相似文献
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介绍了企业应用无盘网络系统的目的和优缺点,并详细阐述了该企业建立RPL无盘终端与PXE无盘WIN98的具体步骤。 相似文献
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龚德和 《数字社区&智能家居》2008,(4):47-49
开学初,受本地一所中学的邀请,要求组建无盘局域网,当时我对无盘技术还接触较少,只好边学边做。通过查找相关资料及对比,我采用了“锐起无盘XP”产品,它具有简单、易操作的特点。 相似文献
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无β环是一种重要的无环级别,与无损联接、保持依赖和4NF一起,成为多值依赖环境下数据库模式规范化的基本要求,能够直接指导数据库的模式设计,文中提出了严格无冲突的概念,以线图为工具,证明了应用分解树算法对一个严格无冲突的MVD集分解得到的数据库模式对应的线图及等权化简子图都是三角化的,而且图中每个三角形都相容的,最后得出无冲突条件下无β环且满足保持数据依赖、无损联接和4NF的数据库模式分解的充要条件 相似文献
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"无装饰"风格源自20世纪60年代的建筑行业的功能主义设计思潮。然而,现代的"无装饰"的风格并不是排斥或摈弃装饰,而是将装饰之"道"融入装饰之"器"。本文探讨无装饰自身的特征,使装饰的外延扩展。 相似文献
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Ilhwan Kim Nobuaki Nakazawa Sungsoo Kim Chanwon Park Chansu Yu 《Control Engineering Practice》2010,18(10):1166-1172
Brushless DC motor drives (BLDC) are finding expanded use in high performance applications where torque smoothness is essential. The nature of the square-wave current excitation waveforms in BLDC motor drives permits some important system simplifications compared to sinusoidal permanent magnet AC (PMAC) machines. However, it is the simplicity of the BLDC motor drive that is responsible for causing an additional source of ripple torque commonly known as commutation torque to develop. In this paper, a compensation technique for reducing the commutation torque ripple is proposed. With the experimental results, the proposed method demonstrates the effectiveness for a control system using the BLDC motors that requires high speed and accuracy. 相似文献
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张会焱 《数字社区&智能家居》2009,(10)
该文主要讨论的是无刷直流电动机启动仿真。首先建立了无刷直流电动机的数学模型,然后详细讨论了无刷直流电动机的三相导通三相星形六状态下磁势随电流流向的改变而改变的情形并给出了启动过程的动态仿真。最后给出了仿真的结果。该文还讨论了电动机参数改变情况下的仿真结果的变化。 相似文献
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Robust dynamic speed response with less maintenance and efficient operation makes the Brushless Direct Current (BLDC) motors as an oblivious choice for many motoring applications which needs instantaneous speed control while developing high torque. This paper proposes Jaya optimization Algorithm on Xilinx platform for BLDC Motor and Fractional Order Proportional Integral Derivative controller to improve its efficiency through minimizing the ripples present in the Torque of the motor. The control strategy of torque controller works with the combinations of Xilinx and optimization algorithms. In this proposed controller, the strategy of control is achieved after deriving the BLDC motor's dynamic mode there after the electronic interaction with BLDC motor is enrooted with the Math lab/Simulink model while tactically utilizing Xilinx tools for all kind of co-simulation in the same model. Initially the dynamic model of a BLDC motor drive is derived and the control topology is designed with the help of the proposed controller. The controlling mechanism established in this paper is effective and efficient in minimizing the ripples present in the torque of the motor. The proposed controller is utilized for possible low-cost and high-performance industrial applications. The results are obtained and analyzed with existing methodologies and it shows that the proposed technique outperforms the existing models. 相似文献
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《Simulation Modelling Practice and Theory》2008,16(9):1254-1265
An off-line identification method founded on the least-squares approximation technique and a closed-loop disturbance observer is applied for identifying the parameters of a BLDC motor model. No special configuration of the motor is required besides the availability of experimental data for back-EMF, phase currents, rotor position, and rotor speed. This method is used to identify the back-EMF harmonics and mechanical parameters, where the mechanical parameters refer to cogging-torque, viscous friction coefficient, and Coulomb friction coefficient. The proposed identification method is theoretically investigated, and the method’s effectiveness is proved by experimental results performed on a low-power BLDC motor. 相似文献
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This paper presents an analysis, design, and strategy of a high-performance speed-sensorless control scheme for estimating the phase-to-phase trapezoidal back-EMF of BLDC motor drive by means of a novel stochastic deconvolution technique in the H∞ setting, named robust stochastic H∞ deconvolution filter. In the proposed method, unlike the conventional observer-based approaches, the back-EMF is considered as an unknown input, and no need is felt for the constancy assumption of the rotor position and speed of machine within a short period of the time in the modeling of the BLDC motor which leads to ignoring the back-EMF dynamic at high and variable speed. In addition, since high-speed operation is vital for the motor, an improved approach has also been proposed to reduce the commutation-torque-ripple at high-speed for direct torque control (DTC) strategy of three-phase BLDC motor with 120° conduction mode in parallel with the proposed method due to the fact that drive performance intensely downgrades in this mode. 相似文献
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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。 相似文献
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Brushless DC (BLDC) machines are found increasing use in applications that demand high and rugged performance. In some critical circumstance, such as aerospace, the motor must be highly reliable. In this context, a novel model-based fault diagnosis system is developed for brushless DC motor speed control system. Under the consideration of the complexity of characterizing the dynamic of BLDC motor control system with analytic expression, a LRGF neural network (LRGFNN) with pole assignment technique is carried out for modeling the system. During the diagnosis process, fault signal of the motor is isolated with LRGFNN online. Meanwhile, adaptive lifting scheme and adaptive threshold method are presented for detecting the faults from the isolated fault signal under the existence of mechanical error and electrical error. The effectiveness of the diagnosis system is demonstrated in the simulation of electrical and mechanical fault in the motor. The detection of the incipient fault is also given. 相似文献
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根据增压用无刷直流电机的具体需求,设计了一套无刷直流电机H桥驱动电路;建立了无刷直流电机的数学模型,分析了变积分PID的优点;在Matlab环境下,设计了实际系统的变积分PID控制器;最后,将系统的运行数据上传至上位机,并对实际运行情况进行了分析。分析表明,控制系统设计较合理,并具有一定的参考价值。 相似文献
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基于DSP/BIOS的无刷直流电机控制系统的研制 总被引:1,自引:0,他引:1
卢小锦 《自动化技术与应用》2011,30(5):21-25
无刷直流电机继承了直流电机运行效率高、调速性能好等优点,同时,克服了直流电机电刷带来的噪声、火花等缺点,在诸多领域得到广泛应用.为改善无刷直流电机控制系统的性能,本文研究模糊自适应PI控制器在无刷直流电机控制系统的应用.系统以TMS320F2812数字信号处理器为控制器设计了控制系统硬件,基于DSP/B10S嵌入式操作... 相似文献