共查询到20条相似文献，搜索用时 437 毫秒
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由于矿井通风系统的优化,北风井通风机自2005年1月后,已调整前导叶角度多次,由0度逐渐调整到现在的33度.井下用风量由原来的218.42立方米/秒,降到129.94立方米/秒.风机风量的调节采用前导器叶片调节,节流功率损失非常大,即电动机的能源损耗很大.因此,对该风机节能降耗研究势在必行. 相似文献
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变频调速器是一种高效节能调速装置,它以DSP或微处理器为核心,为电动机运行多种电气控制和报警功能,保障设备安全,延长使用寿命。特别是它可以根据设定信号调节电动机转速,实现生产自动控制,节电效果显著,可有力地促进企业节能工作的开展,因而在电机供电控制中得到广泛应用。 相似文献
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为探寻调节风窗在均压防灭火系统作用规律,使工作面后部采空区的漏风量及氧气源的补给减少,从而抑制采空区遗留煤体的氧化反应,达到防灭火的目的。从理论上分析均压防灭火系统中调节风窗的作用机理,根据调节风窗的安设引起矿井风量及风压发生变化,对平衡漏风通道两端气体压力的影响,提出在矿井设计及实际生产中,科学设置调节风窗,在保证用风地点风量基础上,确保安全生产的观点。 相似文献
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变频调速器是一种高效节能调速装置，它以DSP或微处理器为核心，为电动机运行多种电气控制和报警功能，保障设备安全，延长使用寿命。特别是它可以根据设定信号调节电动机转速，实现生产自动控制，节电效果显著，可有力地促进企业节能工作的开展，因而在电机供电控制中得到广泛应用。 相似文献
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为探寻调节风窗在均压防灭火系统作用规律,使工作面后部采空区的漏风量及氧气源的补给减少,从而抑制采空区遗留煤体的氧化反应,达到防灭火的目的。从理论上分析均压防灭火系统中调节风窗的作用机理,根据调节风窗的安设引起矿井风量及风压发生变化,对平衡漏风通道两端气体压力的影响,提出在矿井设计及实际生产中,科学设置调节风窗,在保证用风地点风量基础上,确保安全生产的观点。 相似文献
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利用电动机带动控制对象的控制方式,又称电气传动控制。电力拖动控制系统由电动机和控制装置构成。电动机(特别是直流电动机)控制简便、灵活、可靠,而且易于实现自动化,因而电力拖动在生产部门中得到了广泛的应用。 相似文献
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双凸极变速永磁电机的运行原理及其静态特性的线性分析 总被引：46，自引：0，他引：46
双凸极变速永磁电机是一种全新的机电一体化系统．本文首先简要地介绍了该电机的特点，阐述了电机的基本工作原理和基本控制策略，提出了电机参数的线性数学模型，分析了静态特性 相似文献
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Chao Ai Wei Gao Lijuan Chen Jiawei Guo Xiangdong Kong Andrew Plummer 《Journal of The Franklin Institute》2021,358(1):296-320
The requirement for An electrical grid-connected wind turbine is that the synchronous generator speed is stable within a required speed range for the electrical grid. In this paper, a hydraulic wind turbine (HWT) system is considered, and the working principle and working conditions of the HWT are introduced. A novel speed control method is proposed in this paper, using both a proportional flow control valve and a variable displacement motor, which are adjusted in combination to control the speed of the HWT. By establishing a state space model of the HWT and solving the nonlinear system with a feedback linearization method, a bivariate tracking controller is constructed to realize accurate speed control under fluctuating wind speed and the load disturbance conditions. The effectiveness of the control method is verified by simulation, but experimental results highlight problems with the method. The theoretical controller is simplified to reduce sensitivity to measurement noise and modeling error. The control effect has been improved to some extent, but it is limited. Based on these results, combined with the sliding mode variable structure control method and the feedback linearization method to solve the problem of measurement noise and modeling error, and the effectiveness of the control law is finally verified experimentally. It lays a theoretical foundation for the practical application of HWT. 相似文献
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本文主要是在MAX+PLUSII环境下,运用硬件描述语言(VHDL)进行电机转速控制器仿真的实现与分析。PID控制器是电机转速控制系统的一部分,它对转速进行采样,与额定的转速进行比较,并通过微分计算得到电机的控制电流,从而实现对电机转速的调整。 相似文献
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介绍了基于AT89S52单片机,利用红外传感器直流电机的转速,控制直流电机的转动速度,用PWM调速方式控制直流电机转动的速度,以及停止转动,并可以自动调节速度至预先设定的速度。整个系统的电路逻辑结构简单,可靠性高,实现功能强。 相似文献
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《Journal of The Franklin Institute》2023,360(5):3633-3656
In the electric driving system, the measurement of the motor speed error becomes more and more important, which has an impact on the system vibration suppression. In this paper, based on the single-neuron adaptive PID control method, the dual-inertia system considering gear friction torque is modeled and studied. Firstly, the dual-inertia system with gear friction is established, and dynamic differential equations of it are derived; Then, the comprehensive meshing stiffness and the time-varying friction torque of the gear system are deduced; Next, the Ziegler-Nichlos frequency domain response method is adopted to obtain the parameters of the PID controller. The control methods including the PID, Fuzzy-PID with DOB and single-neuron adaptive PID are utilized to adjust the motor speed of the system; Finally, the effects of gear friction, the moment of inertia of load and control methods on motor speed and system error are analyzed. 相似文献
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S. Ushakumari 《Journal of The Franklin Institute》2017,354(14):5996-6032
In this paper, speed control, torque ripple minimization and Power Factor Correction (PFC) of a Canonical Switching Cell (CSC) with Sinusoidal and Space Vector Pulse Width Modulated (SVPWM) sensorless Permanent Magnet Brushless DC (PMBLDC) motor drive system with varying load is discussed. The constant speed of operation with minimum torque ripples and Unity Power Factor (UPF) operation during transient state is the most difficult control part in the motor drive system. At the starting condition, the current is too high due to the absence of back EMF and therefore the motor will start with high torque ripples. In order to eliminate these torque ripples during starting condition by limiting the starting current of the motor, it is necessary to have properly designed Canonical Switching Cell (CSC) converter and an intelligent controller, which will improve the power factor of the supply system and reliability of the PMBLDC motor drive. Here, the speed control, torque ripple minimization and power factor correction of a sensorless PMBLDC motor during starting and running condition with conventional and fuzzy logic controllers are proposed. The performance parameters of a PMBLDC motor with these controllers is analyzed through MATLAB/Simulink software. 相似文献
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通过介绍空间电压矢量脉宽调制(SVPWM)控制策略在无速度传感器矢量控制系统中的实现,在此基础上给出了基于DSP的全数字化调速系统,并分别建立了改进的电压型转子磁链观测模型和PI自适应速度估算模型。实验结果表明:所采用的控制方法正确可行,控制系统具有良好的性能。 相似文献
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为了满足涂附磨具揉曲机的工艺要求,本文设计的涂附磨具揉曲机的自动控制系统以可编程控制器为核心,采用模糊控制技术协调卷取的张力,数字变频器和交流异步电动机控制电动机的速度,力矩控制器和力矩电动机控制收卷速度,张力检测装置检测卷取的张力并构成闭环控制系统。该系统具有速度稳定、张力恒定、可靠性高、操作简便的特点。 相似文献