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.