异步电动机轻载节能运行新型策略及实现

针对轻载运行异步电动机能源浪费严重的实际情况,提出了异步电动机节能运行新型策略,进行了节能机理的分析。通过分析指出,异步电动机起动时应采用恒流软起动,轻载运行时按最大综合力能指标原则进行调压则有最优的节能效果。进行了节能系统的仿真和实验研究。仿真和实验结果都说明了该控制策略正确可行,可以取得异步电动机较好的节能效果。     

异步电动机的调压节电法

以节能的角度看,异步电动机的端电压应等于或小于额定电压。介绍适用于轻载运行电动机的调压节电法,并举例说明调压节电计算方法。     

绕线式异步电动机调压节能控制研究

根据大功率绕线式异步电动机轻载、空载运行时功率因数小、运行效率低的特点,探究大功率绕线式异步电动机的调压节能方法。首先,针对当前绕线式异步电动机节能控制方法的不足,提出了一种恒功率因数与最小电流法相结合的分区复用节能控制方法;其次,基于Matlab/Simulink环境搭建了绕线式异步电动机分区复用节能控制系统仿真模型;最后,得出了分区复用控制下绕线式异步电动机功率因数、定子电流变化关系,验证了轻载、空载时异步电动机在分区复用控制下节能控制效果的优越性。     

基于LADRC的异步电动机降压节能技术

为了实现异步电动机在轻载状况下高效运行,将自抗扰控制策略应用于异步电动机降压节能技术中。首先对电机轻载运行状况和调压节能原理进行分析,推导出不同负载率下的最优电压值,介绍了调压模块的原理。然后设计线性自抗扰控制器,在负载变化时利用调压电路改变电机输入电压,使其跟踪最优电压以实现节能。最后通过仿真分析,结果表明线性自抗扰控制器比传统比例积分微分控制更具有良好的跟踪效果和响应速度。     

异步电动机节能器的分析与实现

异步电动机的节能一般有变频调速节能和轻载降压节能两种方法.本设计采用晶闸管交流调压原理制成电动机降压节电设备,利用其特性,可改善功率因数,减少电力消耗,不仅节电效果理想,还有可观的经济价值. 调压节能原理 1.损耗分析     

交流异步电动机轻载运行节能的研究

设计了一个交流异步电动机软起动和节能运行的控制器,对轻载调压节能的效果进行了研究,给出了硬件电路和软件设计.研究结果表明,该技术在电机轻载运行时具有明显的节能效果,且易于实现软起动、综合保护及调速等多种功能.     

异步电动机的节能控制

针对当今三相异步电动机浪费相对严重的实际情况,从节能角度详尽的分析了其节能的原理.介绍一种以单片机为控制装置,通过晶闸管调压来调节功率因数的大小,进而实现电动机节能目的.且通过实验表明,该装置对经常处于轻载和变负载情况下的电动机,有较好的节能效果.     

一类非经济运行设备的软启动及节能控制研究

从理论上研究了异步电动机轻载相控调压节能的原理,给出了轻载时影响用电效率的三个关键因素：电压、转差和功率因数,提出了节电的条件。从节能运行的角度出发,在理论上建立了按目标用电效率ηi、目标功率因数以及负载率确定最佳调整电压Ulj的公式。并以此给出了按目标效率自动寻优调压控制的实现方法。     

异步电动机节能器的分析与实现

针对异步电动机在轻载、空载运行时出现的功率因数不高、效率低下的耗能现象,文中提出一种经济实用的调压节能方案来进行交流异步电机功率因数及效率的改善,并在深入分析调压节能可实施性的前提上,介绍了在Matlab仿真试验和实际应用中功率因数的检测方法,以及节能器节电率的计算方法。最后在此基础上实现了节能器的硬件设计方案。实验结果表明,本装置能在轻载和空载时达到较好的节电效果。     

具软起动、软停止功能的异步电动机的模糊节能控制器

基于低成本的交流调压系统,设计了适用于交流异步电动机的模糊节能控制器。该系统在正常运行时,实时跟踪负载情况,基于模糊控制规则,调整电动机的输入电压,以降低轻载时电动机的铜损和铁损,提高了工作效率,改善了功率因数;除此以外,更增加了软起动、软停止和综合保护功能。整个控制系统由微型计算机实现,具有很好的应用价值。     

电动机节能的智能控制

在分析异步电动机节能原理的基础上 ,提出了一种以单片机为核心的新型异步电动机节能控制装置 ,整个过程实现了智能控制。实时监测异步电动机的负载大小 ,自动控制其端电压 ,使其与负载理想匹配 ,达到节能的目的     

感应电动机调压节能的理论分析

详细分析了感应电动机在调压情况下的工作原理 ,得到了功率因数与转差率以及转差率与电机定子电压的关系 ,进而得到功率因数与定子电压的函数关系 ,在此基础上建立了调压时感应电动机节能的数学模型。通过算例在理论上证明了调压节能的可行性 ,为电机节能控制奠定了理论基础     

Design and Efficiency Evaluation of a High‐Efficiency Induction Motor for Railway Traction

In commuter trains, a large portion of the energy consumption is a result of losses from traction motors. Therefore, highly efficient traction motors would be very effective for saving energy. We developed an induction motor with a high efficiency of 95.5%. This paper presents the design and an efficiency evaluation of a prototype machine.     

What's the real cost of higher efficiency? [electrical energy efficiency]

The problems that California had with electrical energy have only emphasized the need to look at the true cost of high-efficiency energy devices used by cement plants since electrical energy is among the top expenses in producing cement. This article focuses on low-voltage induction motors and lighting systems. Low-voltage induction motors generally account for about 30% of the electrical energy consumed by a cement plant. Lighting systems generally account for about 3-5% of the electrical energy consumed by a cement plant, but it is a fixed load that does not directly contribute to production. Life-cycle cost analysis is used to determine the true costs of this equipment. True equipment cost is defined as the total of the initial capital expenditures plus the operating costs, which include energy and maintenance. Even though the foremost requirement for a piece of equipment is its performance in the production chain, the justification for selecting one piece over another should be based upon the initial capital cost plus operating expenses. A review is given of two selected areas of electrical equipment to test their cost of ownership.     

高效永磁同步电动机

本文阐述了高效永磁同步电动机的设计特点及运行特性。通过ＮｄＦｅＢ永磁同步电动机与感应电动机的性能比较，指出了ＮｄＦｅＢ永磁同步电动机可以获得高效、节能的效果。     

无速度传感器控制矿用电力机车牵引变频调速器

基于异步电机的定子磁场定向控制模型,研制了无速度传感器控制矿用电力机车牵引变频调速器,选用高性价比的M16C系列MCU作为主控单元,采用PWM死区补偿及速度和励磁电流闭环控制,输出电流谐波小,起动力矩大,成功地用于煤矿10吨架线式矿用电机车的牵引控制。采用变频调速牵引代替了原来普遍使用的调阻电机车和直流斩波电机车,提高了生产效率,大大减小了能耗,降低了机车维修及损耗材料费用。     

Energy efficiency of laws of scalar frequency control of induction electric drives

A comparative evaluation of the energy efficiency of different laws of frequency control of induction motors with fan load is cartied out to substantiate the possibility of saving energy by maintaining the coefficient of stator current shift.     

交流异步电动机的节能

简述交流异步电动机节能的一些方法及措施，阐述其基本原理。     

Optimization of monophase asynchronous electrical motors with an unsymmetrical three-phase stator winding

Mathematical models of single-phase induction motors with asymmetric three-phase and two-phase windings (the number per pole in the main and auxiliary phases is not the same in the latter case). The models allow one to take into account during computations the torques created by higher harmonic fields. Criteria for the optimization of electrical motors are selected and optimization studies of induction capacitor motors are conducted on the basis of the main version of a modern unified series. Opportunities to improve energy performance are shown     

Symmetrization of an Induction Capacitor Motor by Methods of Mathematical Modeling

Reducing electrical losses and increasing energy performance are priorities when designing electrical machines. In addition, increasing initial costs related to electric machine manufacturing owing to an increase in the consumption of active materials are relatively quickly compensated by decreasing operating costs. For single-phase motors, in particular, the capacitor induction motors with electric and magnetic asymmetry, improving ways of reduce electric losses is a very important problem, to solve which it is necessary to study processes of their symmetrization. The design procedure of working and energy characteristics of induction capacitor motors based on the results of solution of electromagnetic equations is proposed. The parameters of phase-shifting capacitor and the motor transformation ratio are determined at which there is a circular magnetic field within the air gap. It is shown that the calculation results can be used for building the graph dependences of transformation coefficient, capacitor capacitance, and capacitor voltage on slip and subsequent analysis of these curves to obtain the most appropriate solutions.