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来源：百度知道 编辑：UC知道 时间：2024/06/04 19:45:30
在工农业行产各人们的日常生活中，经常需要对一些物理量进行控制，如空调系统的温度、供水系统的水压、通风系统的风量等，这些系统绝大多数是用交流电机驱动的。以前由于电机的转速无法方便调节，为了达到对上述物理量的控制，人们只好采用一些简单的方法，如用档板调节风量，用阀门来调节流量压力等，致使这些系统不仅达不到很好的调节效果，而且大量的电能被档板和阀门白白浪费。据统计，我国目前使用的风机、水泵大约有25%的能量是无谓消耗。因此，国家经贸委于1994年下发了763号文件《关于加强风机、水泵节能改造的意见》，鼓励支持变频节能技术在各行各业推广使用。另外，根据交流电机的特性，要实现连续平滑的速度调节，最佳的方法就是采用变频调速器，变频器是将标准的交流电转成频率、电压可变的交流电，供给电机并能对电机转速成进行调节的装置。采用变频器进行风机、水泵的节能改造，不仅避免了由于采用挡板或阀门造成的电能浪费，而且还会极大提高控制和调节的精度，我们可以真正方便地实现恒温空凋系统和恒压供水系统。

Agricultural production line in the People's Daily life, and often need to some parameters, such as the air-conditioning system to control the temperature, water system, ventilation system of air pressure, the system with ac motor is most of the driver. Due to the motor speed cannot before, in order to achieve convenient adjustment to the physical control, people had to using some simple methods, such as by regulating valves, air pressure to adjust the flow in the system, which not only such reach good adjustment effect, and large amounts of energy is wasted baffle and valves. According to statistics, China's current use of fans and pumps about 25% of energy consumption is meaningless. Therefore, the state economic and trade commission in 1994 issued 763 files on strengthening the energy-saving reconstruct fans and pumps, encourage and support in frequency energy-saving technical professions. In addition, according to the characteristics of ac motor, to realize the continuou