why insulated bearing used in motor?

Before answer why insulated bearing used in motor, we need to know what is Electrically insulated bearing? electric insulated bearing adopt the Special spraying process. The outer surface of the bearing is sprayed with high-quality coating, which has strong binding force with the substrate and good insulation performance. It can avoid the electric erosion of the induction current to the bearing, prevent the damage of the current to the grease, the rolling element and the raceway, and electrically insulated bearing improve the service life of the bearing. The process has been improved continuously. In the insulating bearing, there is a layer of 100 μ m thick coating on the outer or inner ring surface, which can withstand the voltage of up to 1000 V DC A special spraying process can form a coating with uniform thickness and strong adhesion, which can be further treated to avoid the influence of moisture and humidity.

Characteristics of electrically insulated bearings

1. Resistant to electrical corrosion

By integrating insulation performance into the bearing, electrically insulated bearings can improve reliability and increase machine uptime by actually eliminating the problem of electrical corrosion

2. High resistance

Alumina coating has a minimum resistance of 200MΩ and can withstand voltages up to 3000 V DC

3. Stable electrical performance

Plasma spraying is usually hygroscopic and therefore easily susceptible to condensation and infiltration. To prevent this effect, Electrically insulated bearings are treated with a unique sealant.

It is mainly a frequency-converter motor powered by a frequency converter, especially a frequency-variable motor with a higher voltage and a frequency converter with a higher switching frequency. This needs to be determined according to the power state of the motor.

Normal grid power supply has no high-frequency voltage and current components. Generally, insulated bearings are not used. Only high-voltage motors such as 400 and above are used. It is not even necessary, but now the frequency conversion power supply, because the power quality contains a lot of high-frequency components, causing the motor shaft current to increase.

Therefore, this problem should be considered in the specifications above 400, and even smaller specifications also consider the installation of insulated bearings according to the use situation. For example, the main motors used in electric cars, electric rail cars, etc. are generally about 100KW, and they must be Electrically insulated Bearings (or use other insulation structures to ensure shaft current does not flow).

Electrically insulated bearing are widely used in many kinds of industry, Motors, generators and related equipment are in danger when current passes through the bearings. This not only damages the contact surfaces of the rolling elements and raceways in the bearing (electrical corrosion), but also quickly degrades the grease. Another additional risk comes from high-frequency currents in motors and generators, which can form a loop through the parasitic capacitance inherent in the device. Increased risk of damage if frequency converter is used.

CoatMaster as the China bearing manufacturer & exporter & supplier, it can supply complete electrically insulated bearing, Our large quantity insulated deep groove ball bearing Stock can meet your need with good quality and fast delivery, Also you can find FAG Current insulated Bearing, the other type and brand insulated deep groove ball bearing, insocoat tapered roller bearing, Current-Insulated Bearings. CoatMaster would like to serve all of the industry customers bearing soluations, please contact with CoatMaster Technical Team.

SKF Electrically insulated bearing for power generating motor machinery

SKF electrically insulated bearings has a long and extensive experience in the motor industry and most industries using motor bearings. In this highly competitive industry, SKF’s extensive knowledge has been used to develop various types of motor bearing solutions to meet the growing needs of motor bearing users in improving quality, shortening delivery times, reducing noise levels, and improving technical support. . At the same time SKF can also provide some special motor bearings to meet specific applications. Just like SKF electrically insulated bearings.

SKF electrically insulated bearing are widely used in many kinds of industry, Motors, generators and related equipment are in danger when current passes through the bearings. This not only damages the contact surfaces of the rolling elements and raceways in the bearing (electrical corrosion), but also quickly degrades the grease. Another additional risk comes from high-frequency currents in motors and generators, which can form a loop through the parasitic capacitance inherent in the device. Increased risk of damage if frequency converter is used.

SKF Electrically insulated bearings:

— Designed to prevent current from flowing through the bearing

— The outer surface of their inner or outer ring is coated with an insulated alumina layer, and a sophisticated plasma spray process is applied to obtain an excellent quality finish.

— A very cost-effective solution compared to other insulation methods

Characteristics of SKF insulated bearings

1. Resistant to electrical corrosion

By integrating insulation performance into the bearing, SKF electrically insulated bearings can improve reliability and increase machine uptime by actually eliminating the problem of electrical corrosion

2. High resistance

Alumina coating has a minimum resistance of 200MΩ and can withstand voltages up to 3000 V DC

3.Stable electrical performance

Plasma spraying is usually hygroscopic and therefore easily susceptible to condensation and infiltration. To prevent this effect, Electrically insulated bearings are treated with a unique sealant.

Series of electrically insulated bearing

The standard scope of supply of insulated bearings includes the most common sizes and variants of bearings:

• Single-row deep groove ball bearings

• Single-row cylindrical roller bearings

In addition to the standard classification, SKF can also provide special INSOCOAT bearings and bearing units with complex ring geometries such as:

— Flanged tapered roller bearings

— Traction motor bearing unit

CoatMaster as the China Bearing Manufacturer, it focus on Research & develop the Electrically Insulated Bearing since 2009, Through 10 years learning from SKF, FAG, NSK Such top quality Bearing manufacturer, CoatMaster Mastered the core technology of insulation technology and the quality of Electrically insulated bearing reached the world class quality level and save the cost for the insulated bearings end-user. its quality are proved by our regular customers on the market.

It not only can produce the top quality Insulated deep groove ball bearings, insulated cylindrical roller bearing, insulated tapered roller bearings, but also the inuslated spherical roller bearing, insulated spherical roller thrust bearings, insulated angular contact ball bearings, insulated linear motion bearing, insulated self-aliging ball bearings, Hybrid ceramic bearing etc. CoatMaster would like to supply the complete bearing industry solution for Electrical Motor of Railways,Industrial electric motors & generators,Wind energy,Construction,Industrial pumps.