In the given configuration CoolBLUE® soft magnetic cores work as a single turn common mode suppression choke. They do not affect the symmetrical power currents but efficiently dampen the asymmetrical radio frequency noise currents. CoolBLUE® also suppresses the asymmetrical EMI currents which are generated by the parasitic currents of the motor itself together with the motor cable.
CoolBLUE® Nanocrystalline absorbers are superior to other soft magnetic materials like ferrites because of significant advantages concerning their magnetic properties. As a consequence only about 20% of ‘magnetic mass’ is required – i.e. a significantly reduced number of cores is suitable.