In order to implement an energy - saving method which keeps iron loss equal to copper loss using variable - voltage in light load , induction motor parameter identification at any moment is a key problem 对于轻载调压使铜损等于铁损的这一节能方法而言，在线辨识出电机的参数是一个关键点。
However , the efficiency of pwm at light load is low and the filter design of pfm is rather difficult due to the random characteristic of the frequency spectrum distribution 采用相应调制方式的ic品种繁多,各有千秋。但pwm在轻载时效率较低,而pfm由于频谱分布随机,不利于后续滤波器的设计。
When tuyere of double disk is jammed , the current of fan will fall to light load current value ; therefore , checking current of fan will find this phenomenon and the system will deal with this condition according to pre - designed program ，当双盘内风口堵塞后，鼓风机电流将降低到空载电流值，故检测鼓风机电流会及时发现这种堵塞现象，系统会根据预设的程序进行处理。
Worse , many incorrectly synchronized programs appear to work correctly in some situations , such as under light load , on uniprocessor systems , or on processors with stronger memory models than required by the jmm 更糟糕的是，许多没有正确同步的程序在某些情况下似乎工作得很好，例如在轻微的负载下、在单处理器系统上，或者在具有比jmm所要求的更强的内存模型的处理器上。
The paper also discusses that the range of random number in binary exponential back - off algorithm influences maximum delay of ethernet , and proper value of maximum random number can make ethernet with light load have better real - time property and satisfy process control 本论文还论述了退避算法中的随机数r的取值范围会影响以太网的最大延时；合理的选取r _ ( ? )的值，能够使轻负荷以太网具有更好的实时性，完全能够满足现场控制的实时性要求。
Through the loss model of lim , best efficiency control scheme is proposed based on the vector control , by which low efficiency of lim under light load or low speed is improved . the control scheme is proved effective through simulation under a specified speed - location curve 通过建立电机损耗模型,在矢量控制的基础上设计了最优效率控制策略,解决了轻载或低速运行时的效率低下问题,通过指定速度位置曲线下的仿真分析验证了控制策略的有效性。
In addition for raising rise - and - fall - speed of goods when crane is in empty load and light load situation we need a improved double - speed - type transmission based on the original single - speed winch . using the differential planetary gear train that can do movement synthesis precisely can achieve this goal 另外为了提高起重机空钩和轻载时的货物升降速度，要求在旧型的单速卷扬机上进行改进实现双速传动，而利用差动行星轮系可进行运动合成的特点能达到这一目的。
Among them , phase shifted ( ps ) full bridge ( fb ) zero - voltage - switched ( zvs ) pulse - width - modulated ( pwm ) dc / dc converter has strong competitive power in big power capacity fields . but it has some limitations such as smaller load range with zvs and larger circulation energy . the ps - fb - zvs - pwm dc / dc converter with a saturable inductor utilizes saturable inductor s critical saturable current characteristic and storage energy , to enlarge load range with zvs and improve output efficiency under light load 其中，移相控制零电压开关脉宽调制dc / dc全桥变换器在大容量领域很有竞争力，但它具有实现零电压开关负载范围小，循环能量大等限制，带饱和电感的移相控制零电压开关全桥变换器利用饱和电感的临界饱和电流特性及储能，来扩大零电压开关( zvs )的负载范围，提高轻载时的输出效率，具有非常重要的研究价值。
This paper studies the variable - voltage energy saving theory and its implementation for asynchronous motor with light load , compares several kinds of scheme of improving efficiency in detail and confirms the variable - voltage energy saving method , that is adjusting the input voltage by detecting the iron loss and copper loss of motor directly . in addition , the directness * , simpleness and availability of the method are verified by the emulational experimental results with simulink of the matlab . the circuit of the general inverter based on the tms320f240 dsp was used in this paper , and the practicable program was compiled 本文分析了异步电动机轻载时降压节能运行的原理，对几种提高效率的方案进行了比较，确定了通过直接检测电动机铁损和铜损来实时调节输入电压以达到高效节能目的的控制方法，应用matlab软件对系统进行仿真，在基于tms320f240dsp的通用型变频器上编制了实用化的程序，形成了完整的样机，对其进行了测试，并给出了试验结果。
This product , adopted pwm integrated circuit and mosfet , igbt that were imported from the overseas , has the following merits : quick - response , strong interfere - proof , stable frequency and voltage , low consumption when light loading , high efficiency and reliable performance , it can be applicable to the family use , pasture region , work with the wind generator and some other places where the power failure often occurs 本品采用pwm （脉宽调制）集成电路和进口大功率mosfet 、 igbt等器件，具有应变快、抗干扰、自动稳定频率和电压、空载损耗低、效率高、性能可靠，是家庭，牧区，风力发电机配套以及其它野外经常停电地区提供交流电的必备的电器。
