Electrical pitting occurs when stray current passes through rolling contact interfaces. This phenomenon is common in variable frequency drive (VFD) motors.
Mechanism of Electrical Damage
Voltage builds across the bearing until dielectric breakdown occurs. Micro-arcing damages raceway surfaces, producing:
1、Fluting patterns
2、Increased vibration
3、Noise escalation
Role of Ceramic Rolling Elements
Silicon nitride interrupts conductive pathways between inner and outer rings.
Benefits include:
1、Elimination of current passage through rolling elements
2、Reduced maintenance cycles
3、Improved motor reliability
Typical Applications
1、Industrial VFD motors
2、EV traction motors
3、Wind turbine generators
Electrical insulation is one of the primary reasons hybrid ceramic bearings are specified in modern electrified systems.
