Smoothing circuit, efficient from IGBT motor drives, so as to extending service life of electric motors, reduce motor noise and eddy loss, reduce the leakage current resulted from the output of high harmonic. Protect the electronic power switch within the inverters with inverter reactor. inverter ac reactor is installed next to the inverter between the inverter and water pump. The drive reactor can smooth filter, reduce motor noise and help prolong the life of the water pump; reduce the leakage current caused by the output higher harmonic, and protect the power switch devices in the inverter. A VFD reactor can also ensure the steadier operation and higher efficiency of the water pump. Features of line reactors for ac drives Selection of silicon steel, ferrite magnetic material of amorphous core according to the frequency of application. Excellent property due to foil winding structure, small DC resistance, strong resistance to the electromagnetic force, good overload ability in a