How to specify an insulated cylindrical roller bearing for an electric motor: NU, NJ, or NUP design, coated ring, suffix, rating, and mounting checks.
Repairing a motor with insulated bearings? Learn how to identify them, replace like for like, decide on an upgrade, and test the insulation after assembly.
Learn why a 1000 V DC insulated bearing rating is not the same as resistance, impedance, capacitance or VFD high-frequency performance.
Decide whether one or two VFD motor bearings need insulation by tracing DE/NDE current paths, grounding, coupling and driven equipment.
This article explains how to diagnose motor bearing electrical erosion by checking raceway fluting, abnormal noise, vibration signals, shaft voltage, and proper corrective actions.
VFDs improve efficiency but introduce a hidden killer: Common Mode Voltage. We break down the engineering physics behind bearing fluting, the dangers of long cables (standing waves), and why upgrading to Inverter Duty Insulated Bearings is the only permanent fix for critical motors >10HP.
Are you relying on shaft grounding rings to protect your VFD motors? In dirty or oily environments like CNC machining, they might be failing silently. We compare the ‘Divert vs. Block’ strategies to help you decide between grounding rings and insulated bearings for permanent reliability.
Download the 2026 TFL Product Catalog to see specifications for our insulated deep groove ball bearings and cylindrical roller bearings, featuring advanced plasma spray coating technology.
Is your “insulated” bearing just a piece of painted steel? This guide reveals the critical differences between cheap spray paint and real plasma ceramic, teaching you 4 simple methods to spot counterfeit insulated bearings before they destroy your equipment.
This technical guide explains the physics behind electrical bearing damage, focusing on how bearing capacitance and impedance allow high-frequency VFD currents to couple across the lubricant film. It covers the mechanisms of EDM, fluting, and how to select the right mitigation strategies like insulated bearings.
This guide outlines the essential procedure for testing insulation resistance in electric bearings to verify protection against damaging shaft currents. It covers necessary equipment, step-by-step testing methods, and how to interpret results to ensure long-term motor reliability.
This practical guide explores essential bearing insulation technologies, including plasma-sprayed ceramic coatings, hybrid ceramic designs, and polymer barriers. It details how these systems prevent Electrical Discharge Machining (EDM) damage in VFD motors and helps engineers select the optimal solution for reliability.
This guide explains the origins of shaft voltage in VFD applications, the risks of electrical erosion, and practical strategies—including grounding and insulation—to protect motor bearings.
This guide outlines the critical steps for OEM engineers to correctly specify electrically insulated bearings during the design phase, ensuring long-term motor reliability in VFD and high-voltage applications by preventing electrical discharge damage.
This engineering guide details the mechanism of VFD-induced shaft currents, explains the damage caused by electrical fluting, and outlines how ceramic-coated and hybrid insulated bearings provide the most effective protection for industrial motors.
This guide explains the destructive impact of stray electrical currents on motor bearings and details how ceramic-coated bearings provide a robust, cost-effective insulation solution to prevent premature failure in modern drive systems.
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