Many enterprises realize that the energy consumption of air compressors is huge. In order to save production costs and reduce energy consumption, they begin to carry out energy-saving transformation of high energy consumption equipment such as air compressors. Have you ever heard of the energy-saving transformation of soft start air compressor? Today, Xiaobian will take you to see what is soft start?

软启动器是如何实现轻载

How does soft starter realize light load and energy saving

笼型异步电机是感性负载，在运行中，定子线圈绕组中的电流滞后于电压。如电机工作电压不变，处于轻载时，功率因数低，处于重载时，功率因数高。软起动器能实现在轻载时，通过降低电机端电压，提高功率因数，减少电机的铜耗、铁耗，达到轻载的目的；负载重时，则提高电机端电压，确保电机正常运行。

Cage induction motor is an inductive load. In operation, the current in the stator coil winding lags behind the voltage. If the working voltage of the motor remains unchanged, the power factor is low under light load and high under heavy load. The soft starter can achieve the purpose of energy saving under light load by reducing the motor terminal voltage, improving the power factor and reducing the copper and iron consumption of the motor; When the load is heavy, increase the motor terminal voltage to ensure the normal operation of the motor.

软启动器适用于哪些场合

Where is the soft starter suitable

原则上，笼型异步电动机凡不需要调速的各种应用场合都可适用。目前的应用范围是交流380V（也可660V），电机功率从几千瓦到800kW。软起动器特别适用于各种泵类负载或风机类负载，需要软起动与软停车的场合。同样对于变负载工况、电动机长期处于轻载运行，只有短时或瞬间处于重载场合，应用软起动器则具有轻载的效果。

In principle, the cage asynchronous motor can be applied to various applications where speed regulation is not required. The current application range is AC 380V (or 660V), and the motor power ranges from thousands of watts to 800KW. The soft starter is especially suitable for various pump loads or fan loads where soft start and soft stop are required. Similarly, the application of soft starter has the effect of light load and energy saving for variable load conditions, long-term light load operation of motor and only short-term or instantaneous heavy load.

变频器是把工频电源(50Hz或60Hz)变换成各种频率的交流电源，以实现电机的变速运行的设备。其中控制电路完成对主电路的控制，整流电路将交流电变换成直流电，直流中间电路对整流电路的输出进行平滑滤波，逆变电路将直流电再逆变成交流电。对于如矢量控制变频器这种需要大量运算的变频器来说，有时还需要一个进行转矩计算的CPU以及一些相应的电路。

Frequency converter is a device that converts power frequency power supply (50Hz or 60Hz) into AC power supply of various frequencies to realize variable speed operation of motor. The control circuit controls the main circuit, the rectifier circuit converts AC into DC, the DC intermediate circuit smoothes the output of the rectifier circuit, and the inverter circuit reverses DC into AC. For a frequency converter that needs a lot of calculation, such as vector control frequency converter, sometimes a CPU for torque calculation and some corresponding circuits are needed.