摘要异步电动机在现在生活中、工业中起着很大的作用，可以说是耗电量最多的设备。在绝大部分情况下，电机是在轻载运行，而轻载运行时的效率较低，会浪费能源。很少会满载运行，满载时效率最高。例如，负载率为 下的功率因数和效率较低，明显浪费很多能源。因此，在面对轻载情况下运行会造成能源的浪费，这就需要对异步电动机进行进行技术改造和节能控制。

对异步电动机轻载情况下的能源损耗进行节能分析和研究，分析电动机机端电压和电源频率对铁耗的影响，还有电流对铜耗的影响,电压将要受负载对转速要求的制约。转矩恒定的情况下，异步电动机的功率损耗、运行效率都将随着运行电压和频率的能达到最优值点。在空载、轻载的运行情况下，对异步电动机提出恒压频比控制或者矢量控制的方案。异步电动机机端电压降低，同时降低电源频率，这样可以降低铁损耗，使总损耗降低。从而提高运行效率，达到节能的目的。而矢量控制，主要是控制电压与电流的相位角，从而减少能量损耗和吸收的无功功率，提高电动机的效率，从而节能，衡量三相异步电动机是否节能主要指标有效率η。由于我国Y系列异步电动机运用广泛，所以我国大量生产电机，额定负载时，电机额定效率较高，额定效率  一般为91。4% ～ 96。9% 。

该论文有图 6幅，表 3 个，参考文献29篇75578

毕业论文关键词：异步电动机  节能  恒压频比  效率  功率因素

Energy saving analysis of high power asynchronous motor

Abstract Asynchronous motor in the present life, industry plays a great role, it can be said that the most power consumption of equipment。 The efficiency of asynchronous motor running in full load is relatively high, while the efficiency of light load operation is obviously low。 For example, the power factor and efficiency under the rated load of less than 20% are significantly lower。 Therefore, the operation of the light load will cause the waste of energy。 Energy saving control of asynchronous motor for long light load operation。

According to the loss and energy saving principle of three-phase asynchronous motor under light load condition, the relationship between voltage and load of asynchronous motor is studied and analyzed。 The voltage will be restrained by the load to the speed requirement For the same load, when the operating voltage of asynchronous motor is not at the same time, the power loss and efficiency would be different In the operation of no-load and light load, the constant pressure than the frequency control or vector control scheme for induction motor Constant ratio of voltage and frequency will make the asynchronous motor terminal voltage is reduced, while reducing the power supply frequency This can reduce the iron loss。 Reduce total loss。 So as to improve the running efficiency and achieve the goal of energy saving。 The vector control is the main control of voltage and current phase angle, thereby reducing the reactive power absorption, improve the power factor of the motor, improve operational efficiency, thereby saving energy While efficiency is one of the main indicators of three-phase asynchronous motor。 China's production of large-scale Y series three-phase asynchronous motor rated efficiency of N is 91。4% ~ 96。9%。 。 the rated load, compared with the power factor and efficiency of asynchronous motor。

Key word:  asynchronous motor   energy conservation  constant voltage frequency ratio  Efficieny  power factor

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