Optimizing EMI filter design for motor drives considering filter component high-frequency characteristics and noise source impedance

This paper proposed an integrated passive EMI filter design procedure with consideration of the component high-frequency characteristics and noise source impedance. There is no longer any need for the traditional cut-off frequency or attenuation slope concepts. Considering DM current amplitude for the CM choke design, so the designed filter will work under drive normal operations includes core saturation effect. The temperature effect on choke impedance is also modeled, which means the winding wire selection is optimally determined by loss and thermal models, and no experimental current density value needed. The high-frequency filter attenuation check is not needed, the design cycle of the EMI filter can be greatly reduced, and over-design of the filter can be avoided. The proposed method can be easily implemented into optimization software with certain noise prediction methods, to realize systematical optimization of drive systems.