Shanghai Anhui Electric Motor Co. Ltd. on the power converter errors
Frequency converter can save energy which is an indelible fact that in some cases can save more than 40%, but some of the situation will be more than the inverter waste!
变频器是通过轻负载降压实现节能的，拖动转距负载由于转速没有多大变化，即便是降低电压，也不会很多，所以节能很微弱，但是用在风机环境就不同了，当需要较小的风量时刻，电机会降低速度，我们知道风机的耗能跟转速的1.7次方成正比，所以电机的转距会急剧下降，节能效果明显。如果我们用在油井上，就会因为在返程使用制动电阻白白浪费很多电能反而更废电。
Inverter is through the light load step-down to achieve energy-saving, drag torque load because there is no change in the speed, even lower voltage, not a lot, so energy is very weak, but in fan environment is different, when need smaller air time, the motor will reduce the speed, we know that fan energy consumption and speed of 1.7 times is proportional to the square, and so the motor torque will be a sharp decline, energy saving effect obviously. If we use in the well, will be because of the use of a braking resistor in vain to return power but also waste a lot of waste electricity.
当然，如果环境要求必须调速，变频器节能效果还是比较明显的。不调速的场合变频器不会省电，只能改善功率因数。
Of course, if the environmental requirements must speed, the frequency converter energy saving effect is more obvious. The frequency converter with no speed will not save energy, but can improve the power factor.
1如果这两个电机的扭矩没有达到电机的额定扭矩状态下工作（频率，转速还是一样50HZ），有变频器的那个能省多少电？
1 if the two motors are not in the torque of the motor to reach the rated torque of the state (frequency, speed is still the same as 50HZ), a frequency converter that can save electricity?
答：如果使用了自动节能运行，这个时刻变频器能降压运行，可以节省部分电能，但是节电不明显。
Answer: if the use of automatic energy saving operation, this time converter can buck the operation, can save part of the electric energy, but the power is not obvious.
2如果两个一模一样的电机都工作在50HZ的工频状态下，一个使用变频器，一个没有，同时转速和扭矩都在电机的额定状态下，那么变频器还能省电吗？能省多少呢？
2 if two identical motors work under 50Hz power frequency, a frequency converter, a not, at the same time speed and torque are in the motor under rated condition, then the inverter can also save electricity?? How much is it?
答：对于这种情况，变频器只能改善功率因数，并不能节省电力。
Answer: for this situation, the inverter can only improve the power factor, and can not save electricity.
