Cases

NewBee Transmission Develops Electrically Insulated Bearings.

1. Definition & Purpose  

Electrically insulated bearings  are specially designed to block stray currents that cause electrical erosion (pitting) in bearings, which can lead to:  

Premature failure of rolling elements & raceways  

Degradation of lubricants due to arcing  

Increased noise & vibration from surface damage  

These bearings are critical in electric motors, generators, wind turbines, and rail traction systems where electrically induced bearing currents are a major concern.  

2. Key Manufacturing Technology  

The insulation is achieved through advanced thermal spraying, forming a high-adhesion ceramic or oxide coating (typically Al₂O₃ or ZrO₂) on the bearing's outer/inner ring.  

Process Characteristics: 

Advantages vs. Traditional Methods:  

Superior bonding-No delamination under thermal cycling  

Uniform thickness-Eliminates weak spots in insulation  

Chemical stability-Resists oils, acids, and moisture  

3. Product Specifications  

Dimensional Range :  

Bore Diameter : 40-140 mm  

Outer Diameter: 80-300 mm  

Width: 18-62 mm  

Performance Features:  

Voltage Resistance: Blocks AC/DC currents up to 1000 V  

Temperature Range: -40℃ to +150℃ (short-term +200℃)  

Coating Hardness: ≥800 HV (similar to bearing steel)  

4. Applications  

Industries:  

Wind Power: Prevents generator shaft currents  

Electric Vehicles: Mitigates PWM-induced bearing currents  

Rail Transit: Insulates traction motor bearings  

Industrial Motors: Protects VFD-driven machinery  

Failure Mode Comparison:  

5. Luoyang Newbee's Innovations  

Our third-generation plasma-sprayed insulation improves:  

Coating Density: Porosity <2% (vs. 5% in conventional coatings)  

Fatigue Life: 30% longer than competitors' insulated bearings  

Cost Efficiency: 20% lower production cost via optimized spray parameters  

Testing Standards:  

IEC 60034-17 (Motor bearing current limits)  

DIN 54150 (Insulation resistance testing)  

6. Why Choose Insulated Bearings?  

5-8x longer service life in electrified environments  

Zero electrical downtime in critical applications  

Retrofit-ready-Same dimensions as standard bearings  

Maintenance Tip:  

Periodically measure insulation resistance (>50 MΩ at 500 V DC) to ensure coating integrity.  

Technical Support:  

For customized solutions (e.g., hybrid ceramic bearings with insulation), contact Newbee's engineering team.