ELIMINATING BEARING CURRENTS
Bearing failure is one of the most common failure modes in electric motors controlled by variable frequency drives (VFD).
The root causes of bearing failure in VFD controlled motors are voltages induced in the rotor by unbalanced phase voltages due to VFD operation and currents induced in the stator and rotor cores due to high frequency harmonics. The induced voltages and the voltages created by the induced currents can exceed the insulation level of the bearing lubricant causing arcing across bearing components which creates pitting, frosting or fluting in the inner and outer races of the bearings eventually causing complete failure of the bearing.
While most motor manufacturers address this issue by adding costly insulated bearings or shaft grounding brushes, Infinitum Electric avoids this issue altogether. This white paper covers the technical details of how Infinitum Electric’s PCB stator avoids destructive bearing currents and improves the overall reliability of the motor.
To download the white paper, complete the form on the right.