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.

China Self aligning roller bearing

Self aligning roller bearing is a kind of radial bearing, it also named spherical roller bearing, which can bear radial load and double-directional bearing load. Self aligning roller bearing has large radial bearing capacity and self-aligning function. It has low requirements on the machining accuracy of the casing, avoids the installation error or shaft deflection that affects the use of the bearing, and has large vibration and impact resistance.

The structure of double row self-aligning roller bearing has developed rapidly, from the initial use of asymmetric spherical roller to the later use of symmetric spherical roller. The symmetrical self-aligning roller bearing changes the situation that the force on the middle flange of the inner ring is large, so that the force on the roller is concentrated at the maximum diameter of the roller, reduces the thickness of the middle retaining ring, correspondingly increases the length of the roller, improves the capacity of the bearing, which is called reinforced structure, and the letter "C" or "CA" is added after the bearing code.

Like the self-aligning ball bearing, the self-aligning roller bearing also has the self-aligning property. However, due to the large contact surface between the roller and the raceway surface, its friction capacity is much higher than that of the self-aligning ball bearing. Because the self-aligning roller bearing also has large friction resistance in rotation, the limit speed of this kind of bearing is lower than that of the ball bearing, but it is different from the line contact situation between the roller and the raceway in the tapered roller bearing, and the limit speed is higher than that of the tapered roller bearing

Common structure types of self aligning roller bearing:

1. The basic type of self-aligning roller bearing 20000c, and the asymmetric self-aligning sub bearing 20000

2. Tapered bore self-aligning roller bearings 20000ck (1:12) and 20000ck30 (1:30),3. This kind of bearing is installed on the tapered shaft by the inner diameter taper, and the axial displacement of the bearing is adjusted to meet the requirements of the interference with the shaft, avoiding the complex operation of heating installation due to the large interference and the problems of easy installation and hard dis-assembly. Of course, the increase of the interference will correspondingly reduce the radial clearance of the bearing.4. Sealed self-aligning roller bearing, double row
5. Single Row self-aligning roller bearing5. Single Row self-aligning roller bearing

The structure of the tapered bore self-aligning roller bearing acting together with the tightening sleeve is 20000c + H000 type. The model of H000 adapter sleeve has been generalized and standardized, and can be used with bearings with various tapered holes. This kind of structure bearing can be installed on the optical shaft without shaft shoulder, which meets the requirement of adjusting the fit interference, and avoids the difficult problem that the taper angle of the tapered shaft is difficult to control, which makes the bearing installation and dis-assembly more convenient.

 XRB is more than 10 years experience China Bearing manufacturer for self-aligning roller bearing design and research,  depending on the rich experience for spherical roller bearing, sealed spherical roller bearing, single row double row spherical roller bearing,  The quality of XRB always to learn The top level Bearing manufacturer of China, and the service life can meet 70% of The top China level, but the price have very big competitive than them, more and more customers use our spherical roller bearing to their application. we will keep our goat that to meet customer demand, keep going on improve our quality,service and our competitive power on the market

China Electrically Insulated Bearing manufacturer

Electrically Insulated Bearing adopted special spraying process, the outer surface of the bearing is coated with high quality film,which has strong binding force with the substrate and good insulation performance.It can avoid the electric erosion of the bearing caused by the induced current, prevent the damage caused by the current to the grease, rolling body and raceway, and improve the service life of the bearing.

The process has been improved continuously. In the insulated bearing, there is a layer of 100μ m thick coating on the outer or inner ring surface, which can withstand the voltage of up to 1000 V DC. Special spraying process can form a coating with uniform thickness and strong adhesion,After further treatment, To protect it from moisture and humidity after further treatment.

Electrically Insulated Bearing can avoid the damage caused by electric corrosion, Therefore, compared with the common bearing, it can be used in the motor to ensure more reliable operation. Compared with other insulation methods, such as shaft or shell insulation, it is more cost-effective and reliable. The external dimensions and basic technical characteristics of insulated bearings are the same as those of uninsulated bearings, so they can be 100% interchanged. It is suitable for motors and generators, especially for variable frequency motors.

Electrically insulated bearing classification

Electric insulated deep groove ball bearing

Electric insulated angular contact ball bearing

Electrical insulated cylindrical roller bearing

Insulated bearing of inner or outer ring with oxide coating

Hybrid bearing with electrically insulated ceramic rolling element
 

Dimensional range of electrically insulated bearing

1. Electrically insulated deep groove ball bearing

Internal diameter range: 40mm-140mm

Outer diameter range: 80mm ～ 300mm

Width dimension range: 18mm ～ 62mm

2. Electrically insulated angular contact ball bearing

Internal diameter range: 40mm-140mm

Outer diameter range: 80mm ～ 300mm

Width dimension range: 18mm ～ 62mm

3. Electrically insulated cylindrical roller bearing

Internal diameter range: 45mm-140mm

Outer diameter range: 100mm-300mm

Width dimension range: 25mm-62mm

Application of Electrically Insulated Bearing in motor

1. The cause and harm of the formation of motor shaft voltage and bearing curren,In the operation of the motor, any unbalance in the stator and rotor magnetic circuit or the phase current around the shaft can produce the flux linkage of the rotating system, When the shaft rotates, these flux chains can produce potential difference at both ends of the shaft, This potential difference is called shaft voltage,The shaft voltage can excite the circulating current in the loop (closed circuit) formed by the shaft and the casing through the bearings at both ends, which is called the shaft current, In addition, there is a lot of residual magnetism in the rotor core. For wound rotor motors, if two or more winding points are short circuited to the rotor core or rotor shaft, shaft voltage and shaft current will also be generated.

The magnitude of the bearing current is related to the structure of the motor, the power of the motor, the amplitude of the driving voltage, the rise time of the pulse, the length of the cable, etc. The greater the power of the motor, the higher the driving voltage, the steeper the rising edge of the driving voltage and the shorter the cable, the greater the bearing current.

2. Measures to block shaft current – using Electrically Insulated Bearing

In order to avoid the damage of the shaft current to the bearing, effective measures should be taken to isolate the shaft current. For large motors with independent bearing pedestals at both ends, isolation gaskets made of insulating materials can be placed between the bearing pedestals and metal pedestals. For the motor with ordinary bearing and shell assembled as a whole, the insulating bearing is generally used at one end (usually arranged at the extension end of non main shaft). For the occasions with high requirements, the insulating bearing is installed at both ends. The insulating bearing used is generally the method of adding (coating) insulating layer to the outer ring, and the inner and outer rings are also used in some occasions.

CoatMaster as the trademark of China Bearing manufacturer focus on manufacture complete Electrially insulated bearing such as

— Electrially Insulated Deep Groove Ball Bearing
— Electrially Insulated Cylindrical roller bearing
— Electrially Insulated self-aligning ball bearing
— Electrially Insulated angular contact ball bearing
— Electrially Insulated taper roller bearing
— Electrially Insulated spherical roller bearing
— Electrially Insulated thrust roller bearing
— Hybrid ceramic ball bearing

CoatMaster is more than 10 years experience China Bearing manufacturer for Electrically Insulated bearing design and research,  depending on the rich exprience for special spraying process and advance equipment,  The quality of CoatMaster always to learn The top level Bearing manufacturer of the world, and the service life can meet 70% of The top brand level, but the price have very big competitive than them, more and more customers use our electrically insulated bearing to their application. we will keep our goat that to meet customer demand, keep going on improve our quality,service and our competitive power on the market.

China high temperature tapered roller bearing manufacturer

High temperature bearing is a kind of bearing that can stand high temperature,There are many kinds of high temperature resistant bearings. According to different needs and different environments, different types of bearings can be installed.

According to its internal structure technology, High temperature bearing can be divided into common structure and special structure high temperature taper roller bearing.High temperature bearing is widely used in metallurgy, kiln, glass, blast furnace, painting equipment and other high temperature operation machinery.

Pillow Block Bearing with housing

Easier is a registered trademark of XRB bearing, including bearing with housing, pillow block and insert ball bearing. The bearing with housing is composed of pillow block and outer spherical bearing.Pillow block Bearing with housing can carry out simple and effective automatic centering for installation error, which can be easily installed on various industrial shafts, especially on the equipment frame.

Pillow block Bearing with housing has a wide range of products, including vertical seat, various flanged housing, keyway seat, circular pillow block, etc. the materials include gray cast iron pillow block, nodular cast iron housing, steel plate stamping pillow block. Stainless steel housing and plastic pillow block.

The pillow block bearing and the bearing housing can be interchanged each other. The same bearing housing can be equipped with various types of pillow block bearing, and the same pillow block bearing can also be equipped with various types of bearing housing.

The quality seals is the very important factor to affect the operation of the pillow block bearing, Easier pillow block bearing pays attention to sealing, and different sealing methods can be selected according to different application occasions, including J-type rubber seal, H-type dust-proof metal seal, SL type double-layer seal. L3 type three lip seal, F type combination seal, special multilayer seal, bearing end cover seal, bearing seat end cover seal, etc.

Easier Pillow block bearing can be easily installed and fixed on the standard shaft through eccentric locking collar, Set Screw, adapter sleeve or concentric sleeve.The reliable, simple and easy to install features make the pillow block bearing with housing widely used in agricultural machinery, mining equipment, textile machinery, fans, hoists, packaging machinery, fitness equipment, Three dimensional parking equipment, construction machinery, processing and automation equipment, etc.

Classification of pillow block bearings with housing

A. classification in sealed form

-J type rubber seal

-H-type dust-proof metal seal

-SL double seal

-L3 three lip seal

-F-type combined seal

-Special multilayer seal

-Bearing end cover seal

-Bearing seat end cover seal

B.Classification by locking nut 

-Eccentric sleeve locking

-set screw locking

-adapter sleeve

-Concentric sleeve locking

C. classification by bearing housing material

-With gray cast iron housing

-With ductile iron housing

-Stamping housing with steel plate

-With stainless steel housing

-With plastic housing

-With rubber housing

Selection of pillow block bearing with housing

The application selection of pillow block bearing with housing shall be based on the application requirements of equipment, with emphasis on speed, load, service environment, etc.

Easier (China Bearing manufacturer) provides the necessary technical information to help select the most suitable bearing products for most applications. Easier can also provide non-standard pillow block bearing with housing.We are always committed to providing one-stop service and product solutions for bearings with seats.

Set Screw Locking NSK UCP328D1 Pillow Block Bearing Unit for Industrial Applications Where Heavy Loads

Product Details:

Place of Origin:	Japan
Brand Name:	NSK
Certification:	ISO9001/TS16949
Model Number:	bearing UCP328D1

Payment & Shipping Terms:

Minimum Order Quantity:	1 pcs
Price:	USD$190/pcs
Packaging Details:	NSK packing or carton
Delivery Time:	2 days-15 days
Payment Terms:	T/T, Cash, Paypal, West Union
Supply Ability:	5,000pcs per month

Detailed Product Description

Designation:	UCP311D1 Bearing Unit	Bore:	55 Mm
Housing:	Cast Iron	Application:	Industrial Applications Where Heavy Loads
Stock:	800 Pcs	Feature:	Set Screw Locking

NSK UCP328D1 Pillow Block Bearing Unit
 

Bearing specification	NSK UCP328D1 Bearing Unit
Housing Number	P328D1
Insert Bearing number	UC328D1
Shaft Size:	140mm
Bolt Size	M33 1-1/4 in
H	200mm
L	620mm
A	140mm
J	500mm
weight	92.5kg
Locking style	Set Screw Locking
Grease Fitting	A-1/4-28UNF

Set Screw Locking NSK UCP328D1 Pillow Block Bearing Unit for Industrial Applications Where Heavy Loads

High Quality NSK UCP328D1 Pillow Block Bearing Unit consist of Cast Iron Housing(Pillow type), ball, cage, wide inner ring, Hexagon soket set scrow, outer ring with spherical outside serface, Seal, Grease hole, slinger ect. you can see that this bearing have a wide inner ring with set screws for attaching to the shaft,housing is cast iron with a grease zerk for re-lubrication the bearing.

The NSK UCP328D1 Pillow Block Bearing Unit set screws are placed at a 90-degree angle to optimize balance between holding power and inner ring distortion. The UCP328 pillow block bearings are relubricatable and offer a full-width inner ring for added stability.

 

NSK UCP328D1 Pillow block bearing units mainly be used to bear axial and radial load, Generally it’s not suitable to bear the axial load alone, this kind of bearing can be equipped with inner ring (with full set of roller and retainer) and outer ring separately. But it does not allow that the shaft to tilt relative to the housing. additional axial force will be generated under radial load. The size of the axial clearance of this type of bearing is very important for the normal operation of the bearing. when the axial clearance is too small, the temperature rises higher, when the axial clearance is large, the bearing is easy damaged.

 

Specifications Of NSK UCP328D1 Pillow Block Bearing Unit

Bearing Number	UC328D1 Pillow Block Bearing Unit
Shaft Size d	140 mm
Weight	203.9 lb 92.50 Kg
Locking Style	Set Screw Locking
Housing Construction	Two-Bolt Pillow Block

 

Dimensions of NSK UCP328D1 Pillow Block Bearing Unit

Base to Center Height H	200.00 mm 7.874 in
Total Length L	620.00 mm 24.409 in
Housing Width A	140.00 mm 5.512 in
Bolt Hole Spacing J	500.00 mm 19.685 in
Bolt Hole Size N	40.00 mm 1.575 in
Bolt Hole Length N1	55.00 mm 2.165 in
Foot Height H1	60.0 mm 2.362 in
Total Height H2	393.00 mm 15.472 in
Dimension L1	185.00 mm 7.283 in
Inner Ring Width B	145.00 mm 5.709 in
Center of Bearing from End S	59 mm 2.323 in

 

Basic Load Ratings of NSK UCP328D1 Pillow Block Bearing Unit

Static Load Rating	55303 lbf 246000 N
Dynamic Load Rating	56877 lbf 253000 N

 

Explorer bearing is the China Bearing manufacturer & exporter & factory & supplier, Pillow Block Bearing also name insert bearing with housing, it can Supply NSK UCP328D1 Pillow Block Bearing Unit and also produce pillow block bearing unit with cast iron housing, pressed steel housing, stainless steel housing. and many kinds of Pillow Block Bearing unit like UCP200 Series, UCPX00 Series, HCAK200 Series, UEP200 Series, SBSP200 Series, SSUCP200 Series, SSUCP200-TP Series, TYPE-E Series, M2000 Series, BLP200 Series, ALP200 Series, UCPH200 Series, UCPA200 Series. we are sure we can supply the good price, fast delivery and perfect service for all of the bearing distributor and end user.

 

And also Explorer Bearing as China Bearing Manufacturer, it not only supply Pillow block Bearing Units, but also many other kinds of China Ball And Roller Bearing & sliding Bearing
-- Electrically Insulated bearing
-- Deep groove ball bearing
-- Cylindrical roller bearing
-- Spherical roller bearing
-- Pillow Block Bearing Unit
-- Plummer block Housing Unit
-- Angular contact ball bearing


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