CoolBlue Toroidal Cores

CoolBlue® toroidal cores made from our nanocrystalline material Nanoperm® are used to reduce harmful voltages and currents in motor bearings in high-performance and/or fast-cycling inverter drive systems. These unwanted currents in the bearings lead to matting/fluting of the motor bearing, electrical breakdown of the bearing lubricant, and finally to complete failure of the motor.

In addition to reducing overvoltage at the motor terminals, targeted use of CoolBlue® toroidal cores also significantly suppresses the asymmetrical interference currents caused by parasitic leakage capacitances of the motor cable and the motor.

High frequency common mode currents leading to electrical breakdown in the lubrication of the motor bearings and are causing additional maintenance costs.

The Magnetec Nanoperm CoolBlue® line made of nanocrystalline material Nanoperm is being used to reduce damaging motor bearing currents in inverter – motor systems.

The CoolBlue® cores are used for suppressing the common mode EMI noise generated by the frequency converters. In order to achieve an efficient reduction of these destructive effects, CoolBlue cores have to be placed over the connector cables (without N and PE) in the DC-link or at the inverter output. In this configuration, the cores operate as a common-mode choke.

CoolBlue® Selection Guide

CoolBlue® tape wound cores to reduce motor-bearing currents