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?

軟啟動器是如何實現(xiàn)輕載

How does soft starter realize light load and energy saving

籠型異步電機是感性負載，在運行中，定子線圈繞組中的電流滯后于電壓。如電機工作電壓不變，處于輕載時，功率因數(shù)低，處于重載時，功率因數(shù)高。軟起動器能實現(xiàn)在輕載時，通過降低電機端電壓，提高功率因數(shù)，減少電機的銅耗、鐵耗，達到輕載的目的；負載重時，則提高電機端電壓，確保電機正常運行。

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.

軟啟動器適用于哪些場合

Where is the soft starter suitable

原則上，籠型異步電動機凡不需要調(diào)速的各種應用場合都可適用。目前的應用范圍是交流380V（也可660V），電機功率從幾千瓦到800kW。軟起動器特別適用于各種泵類負載或風機類負載，需要軟起動與軟停車的場合。同樣對于變負載工況、電動機長期處于輕載運行，只有短時或瞬間處于重載場合，應用軟起動器則具有輕載的效果。

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.

變頻器是把工頻電源(50Hz或60Hz)變換成各種頻率的交流電源，以實現(xiàn)電機的變速運行的設備。其中控制電路完成對主電路的控制，整流電路將交流電變換成直流電，直流中間電路對整流電路的輸出進行平滑濾波，逆變電路將直流電再逆變成交流電。對于如矢量控制變頻器這種需要大量運算的變頻器來說，有時還需要一個進行轉矩計算的CPU以及一些相應的電路。

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.