TFL Electrically Insulated Deep Groove Ball Bearings
TFL Electrically Insulated Deep Groove Ball Bearings prevent electrical corrosion caused by current flow. They are widely used in motors, generators, and other electrical equipment with frequency converters. TFL applies advanced alumina ceramic coating to ensure high insulation performance while maintaining high speed and low noise. The bearings can withstand up to 3000V DC insulation voltage, effectively prolonging equipment life and reducing downtime and maintenance costs. With reliable quality and strong cost-effectiveness, they are a trusted choice for many industrial customers, especially small and medium-sized enterprises with bulk purchasing needs.
Uncompromised Mechanical Performance and Durability
An insulated bearing must first be an excellent bearing. Our TFL series starts with a high-quality deep groove ball bearing foundation, manufactured from ultra-clean, high-purity bearing steel. This ensures high load-carrying capacity, low noise, and a long fatigue life. The insulation coating is designed to be incredibly durable, adhering strongly to the base metal to resist cracking or flaking, even under conditions of high vibration or shock loads. The coating process is carefully controlled to have no negative impact on the bearing’s fundamental geometry, internal clearance, or rotational precision.
This means our TFL Electrically Insulated Deep Groove Ball Bearings deliver the same mechanical performance and reliability you would expect from a premium non-insulated bearing, but with the critical added benefit of electrical protection. It’s a two-in-one solution that guarantees both mechanical integrity and electrical safety.
Advanced Aaluminum Oxide Coating Technology
The superior performance of our insulated ball bearings stems from our advanced coating process. We apply a plasma-sprayed layer of high-purity aluminum oxide (Al₂O₃) to the outer surface of the bearing’s inner or outer ring. This coating is not just a layer of paint; it’s a precisely engineered ceramic barrier with exceptionally high dielectric strength, typically offering a breakdown voltage of up to 3000V DC. The coating is meticulously applied to ensure a uniform thickness, maintaining the bearing’s critical dimensional tolerances for a perfect fit.
Furthermore, this robust ceramic layer is extremely hard and wear-resistant, and its excellent thermal conductivity ensures that heat is effectively dissipated from the bearing. This advanced technology ensures that our electrically insulated bearings provide consistent, reliable protection throughout their entire operational life, even in demanding industrial environments.
Seamless Drop-In Replacement for Standard Bearings
We design our TFL Electrically Insulated Deep Groove Ball Bearings for maximum convenience and interchangeability. The external dimensions of our coated bearings are identical to those of standard, non-insulated bearings of the same size designation (e.g., 6220, 6312). This means they can be used as a direct “drop-in” replacement in existing applications without any need to modify the shaft or housing. This interchangeability simplifies the upgrade process, making it easy to enhance the reliability of your current equipment.
Whether you are replacing a failed standard bearing in a motor or proactively upgrading your machinery, TFL provides a hassle-free solution. This feature is invaluable for maintenance teams and design engineers, saving time and resources during installation and retrofitting, and making the switch to a more reliable solution effortless.
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FREQUENTLY ASKED QUESTIONS
Does the insulation coating affect the bearing's heat dissipation?
Yes, but the impact can be ignored.
This is a valid concern. While any coating can slightly alter thermal properties, our aluminum oxide coating has good thermal conductivity for a ceramic material. The layer is also very thin and applied only to one surface of one ring. In extensive testing and real-world applications, we've found that the effect on the overall operating temperature of the bearing is negligible for the vast majority of motor and generator applications. The prevention of electrical erosion and subsequent lubricant breakdown has a far more significant and positive impact on maintaining a healthy operating temperature and extending the bearing's life.
What is the typical breakdown voltage of TFL electrically insulated deep groove ball bearings?
Our standard TFL aluminum oxide coating is engineered to provide a minimum breakdown voltage of 1000V DC. However, for more demanding applications, such as those involving high-power VFDs or medium-voltage motors, we offer enhanced coating options that provide insulation protection up to 3000V DC. The specific breakdown voltage required depends on your application's operating voltage and the nature of the stray currents. We recommend consulting your motor's technical specifications or contacting to us to select the appropriate level of protection.
Why is the coating typically on the outer ring? When would I need an inner ring coating?
This is an excellent engineering question. The coating is most commonly applied to the outer ring because it's the most effective and economical way to insulate the bearing from the housing, which is typically grounded. It breaks the primary path for stray currents. However, you would need a bearing with an inner ring coating in specific situations where it's more practical to insulate the bearing from the rotating shaft.
This might be necessary if the outer ring fit is very loose, or in specialized designs where multiple components on the shaft need to be isolated. As a full-service insulated bearing supplier, we offer both configurations to ensure you have the right solution for your unique application.
How long will it take to ship after the payment?
We have sufficient inventory. Most orders will be shipped within 10 days or less. After the order is dispatched, you can track the logistics information at any time until the goods are signed for.