Insulated bearing

The most important feature of insulated bearings is the presence of a very thin coating (on the micrometer level) on their surface, which provides electrical insulation and can withstand electrical arcing caused by voltages exceeding 500V. A thicker coating can even resist high-voltage discharges up to 1,000V. As a result, these bearings effectively prevent defects such as arcing induced by induced currents on the spindle and bearing, which could otherwise lead to corrosion on the bearing surface, the formation of shrinkage cavities on metal surfaces, and the creation of grooves on the bearing’s rolling elements.

Category:

Coating spray processing

Plasma spraying processing

Key words :

绝缘轴承

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Product Description

Insulated bearing

The most important feature of insulated bearings is that their surface has a very thin ( Um a coating of (level), which serves as an electrical insulator and can withstand over 500V Electric sparks generated under voltage—thicker coatings can withstand them. 1000V High-voltage discharge can effectively prevent arcing on the spindle and bearings caused by induced currents, which in turn can lead to defects such as bearing surface corrosion, shrinkage cavities forming on metal surfaces, and grooves developing on the bearing rolling tracks.

Here, MS. Special note: At high frequencies, the induced shaft current can be substantial. If non-insulated bearings are used, the circulating currents that flow through the bearings can easily cause overheating or severe electrical corrosion, leading to bearing damage.

Coating on the inner or outer ring

Insulated bearings employ a special spraying process to apply a high-quality coating onto the outer surface of the bearing. This coating exhibits strong adhesion to the substrate and excellent insulating performance, effectively preventing electrochemical corrosion caused by induced currents. It also safeguards the grease, rolling elements, and raceways from damage due to electrical currents, thereby extending the service life of the bearing.

This process is continuously being improved; in insulated bearings, there is a layer on either the outer or inner race surface. 100 mu m Thick coating, capable of withstanding up to 1000 V DC The voltage. A special spraying process creates a coating that is uniformly thick and exhibits exceptionally strong adhesion. After further processing, this coating becomes resistant to the effects of moisture and humidity.

Electrical insulation bearings can prevent damage caused by electrical corrosion; therefore, when used in motors, they ensure more reliable operation compared to conventional bearings. Moreover, compared to other insulation methods—such as shaft or housing insulation—this approach is more cost-effective and dependable.

Under high-temperature conditions, its DC impedance can also reach G The Ohm range exhibits excellent insulation performance. Ceramic rolling elements boast superior wear resistance and require low lubrication, making them particularly suitable for applications involving high speeds, low friction, and low-temperature operation. They perform well under dry-friction conditions. For small-sized rolling bearings, using ceramic rolling elements in insulated bearings offers excellent economic benefits.