During operation, the friction between the carbon brushes and the rotor generates interference, which can cause other electrical appliances to malfunction and affect the normal operation of the power grid. X2 is used to eliminate differential mode and harmonic interference, and Y2 is used to eliminate common mode interference.Mainly used for electric tools (e.g. juicer, blender, etc.) to eliminate the interference between carbon brushes and rotor when the electric tools are working.