The big player ABB is casting its spotlights on what are shaft currents and how to protect AC motor. Over time, continual arcing within an electric motor will cause damage to the surface of the bearing raceway resulting in vibration and heat, loud operating noises, and eventually motor failure.
Fortunately, there are several practical and easy ways to mitigate shaft current issues. Using proper VFD cables and bearing protection will help protect the life of your motor and driven equipment.
Brush protection rings and insulated bearings are just a few ways to mitigate shaft currents that can harm the motor and equipment. Including these preventive measures will ensure peace of mind and increase the reliability of your inverter duty motor performance.