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在工业生产、交通运输及日常生活中大量采用交流异步电动机与变频器相结合的交流调速传动在国外已极为广泛,在国内也开始逐渐推广。采用变频调速传动主要是为了达到两个目的:一是满足工业生产、交通运输及日常生活中的各种要求,如提高生产率、改进产品质量、提高设备自动化程度、提高生活质量及改善生活环境等;二是为了使交流异步电动机处于最佳运行状态,从而节约能源和资源。 用变频器对交流异步电动机进行调速改造非常简单,只要将变频器接在电源馈线与交流异步电动机之间就构成一套交流变频调速系统。变频器操作简单、易于控制,而且又能实现软起动和软停止,这不仅消除了因直接挂网起动而存在的对电动机及设备的机械撞击,也减少了因直接挂网起动而存在的对电网的冲击,从
In industrial production, transportation and daily life, extensive use of AC asynchronous motor and inverter AC speed control drive has been extremely extensive in foreign countries, also began to gradually promote the country. The use of frequency control drive is mainly for two purposes: First, to meet the industrial production, transportation and daily life of the various requirements, such as improving productivity, improve product quality, improve equipment automation, improve quality of life and improve the living environment Etc .; second is to make the AC asynchronous motor in the best operating conditions, thus saving energy and resources. Speed ?? inverter with AC induction motor speed control is very simple, as long as the inverter connected to the power feeder and AC induction motor to form a set of exchange frequency control system. The frequency converter is easy to operate and easy to control. It also enables soft-start and soft-stop. This not only eliminates the mechanical impact on the motor and equipment due to direct start-up but also reduces the risk of direct start-up The impact of the grid, from