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Electrically Insulated cylindrical roller bearings

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Electrically Insulated cylindrical roller bearings have outer ring coating, inner ring coating and ceramic material rolling elements. Because of the higher cost of using ceramic material rolling elements, in most cases, the inner ring or outer ring 50-200 μm is used. Thick ceramic coating. The first two coatings are plasma spraying method to coat ceramic material on the bearing surface. This coating still maintains its insulation performance in a humid environment. The ceramic material rolling element insulated bearing is the rolling element. Using ceramic materials, it has excellent current resistance capability.

These three methods can make the cylindrical roller bearing achieve the effect of insulation, so that the bearing will not be damaged by current during operation, and it can resist the electric flashover generated under 1000V voltage. The thicker coating can resist the high voltage above 1000V. Discharge.

Electrically insulated bearings can avoid damage caused by electrical corrosion, so compared with ordinary bearings, they can be used in motors to ensure more reliable operation. Compared with other insulation methods, such as shaft or housing insulation, it is more cost-effective and reliable. The outer dimensions and basic technical characteristics of insulated bearings are the same as those of non-insulated bearings, so they can be 100% interchanged.

 

 

Normally Cylindrical roller bearings are available in a wide range of designs, series, variants and sizes. The main design differences are the number of roller rows and the inner/outer ring flanges as well as cage designs and materials.

Cylindrical Roller Bearings And insulated Cylindrical roller bearings also have many different design as follows

–Single Row Cylindrical Roller Bearings

–Double Row Cylindrical Roller Bearings

–High Capacity Cylindrical Roller Bearings

–Single Row Full Complement Cylindrical Roller Bearings

–Double Row Full Complement Cylindrical Roller Bearings

 

Designation Principal dimensions Basic load ratings Fatique load limit Speed ratings Weight
Cylindrical roller bearings mm mm mm dynamic static Reference speed Limiting speed kg
d D B C[kN] C0[kN] [r/min] [r/min]
NU 1010 ECP/C3VL0241 50 80 16 46.8 56 6.7 9500 9500 0.27
NU 210 ECM/C3VL0241 50 90 20 73.5 69.5 8.8 8500 9000 0.48
NU 310 ECM/C3VL0241 50 110 27 127 112 15 6700 8000 1.36
NU 1011 ECP/C3VL0241 55 90 18 57.2 69.5 8.3 8500 8500 0.4
NU 1011 ECML/C3VL0241 55 90 18 57.2 69.5 8.3 8500 13000 0.4
NU 211 ECM/C3VL0241 55 100 21 96.5 95 12.2 7500 8000 0.78
NU 311 ECM/C3VL0241 55 120 29 156 143 18.6 6000 7000 1.75
NU 1012 ML/C3VL0241 60 95 18 37.4 44 5.3 8000 13000 0.48
NU 1012 ECP/C3VL0241 60 95 18 58.3 73.5 8.8 8000 8000 0.48
NU 212 ECM/C3VL0241 60 110 22 108 102 13.4 6700 7500 0.1
NU 312 ECM/C3VL0241 60 130 31 173 160 21.2 5600 6700 2.2
NU 1013 ECP/C3VL0241 65 100 18 62.7 81.5 9.8 7500 7500 0.45
NU 213 ECM/C3VL0241 65 120 23 122 118 15.6 6300 6700 1.3
NU 313 ECM/C3VL0241 65 140 33 212 196 25.5 5300 6000 2.63
NU 1014 ECM/C3VL0241 70 110 20 76.5 93 12 7000 7000 0.7
NU 1014 ECP/C3VL0241 70 110 20 76.5 93 12 7000 7000 0.7
NU 214 ECM/C3VL0241 70 125 24 137 137 18 6000 6300 1.4
NU 314 ECM/C3VL0241 70 150 35 236 228 29 4800 5600 3.2
NU 1015 M/C3VL0241 75 115 20 58.3 71 8.5 6700 6700 0.75
NU 215 ECM/C3VL0241 75 130 25 150 156 20.4 5600 6000 1.5
NU 315 ECM/C3VL0241 75 160 37 280 265 33.5 4500 5300 4
NU 315 ECP/VL0241 75 160 37 280 265 33.5 4500 5300 4
NU 1016 ECM/C3VL0241 80 125 22 99 127 16.3 6000 6000 1.05
NU 216 ECM/C3VL0241 80 140 26 160 166 21.2 5300 5600 1.9
NU 316 ECM/C3VL0241 80 170 39 300 290 36 4300 5000 4.6
NU 1017 M/C3VL0241 85 130 22 68.2 86.5 10.8 6000 6000 1.1
NU 217 ECM/C3VL0241 85 150 28 190 200 25 4800 5300 2.3
NU 317 ECM/C3VL0241 85 180 41 340 335 41.5 4000 4800 5.4
NU 1018 M/C3VL0241 90 140 24 80.9 104 12.7 5600 5600 1.4
NU 218 ECM/C3VL0241 90 160 30 208 220 27 4500 5000 2.8
NU 318 ECM/C3VL0241 90 190 43 365 360 43 3800 4500 6.3
NU 1019 ML/C3VL0241 95 145 24 84.2 110 13.2 5300 5300 1.4
NU 219 ECM/C3VL0241 95 170 32 255 265 32.5 4300 4800 2.9
NU 319 ECM/C3VL0241 95 200 45 390 390 46.5 3600 4300 7.3
NU 1020 M/C3VL0241 100 150 24 85.8 114 13.7 5000 5000 1.5
NU 220 ECM/C3VL0241 100 180 34 285 305 36.5 4000 4500 4.05
NU 320 ECM/C3VL0241 100 215 47 450 440 51 3200 3800 8.7
NU 1022 M/C3VL0241 110 170 28 128 166 19.3 4500 4500 2.3
NU 222 ECM/C3VL0241 110 200 38 335 365 42.5 3600 4000 5.7
NU 322 ECM/C3VL0241 110 240 50 530 540 61 3000 3400 12
NU 1024 M/C3VL2071 120 180 28 134 183 20.8 4000 4000 2.7
NU 224 ECM/C3VL0241 120 215 40 390 430 49 3400 3600 6.7
NU 324 ECM/C3VL0241 120 260 55 610 620 69.5 2800 3200 14.9
NU 1026 M/C3VL2071 130 200 33 165 224 25 3800 3800 3.9
NU 226 ECM/C3VL2071 130 230 40 415 455 51 3200 3400 7.7
NU 326 ECM/C3VL2071 130 280 58 720 750 81.5 2400 3000 18.5
NU 1028 M/C3VL2071 140 210 33 172 245 27 3600 3600 4.1
NU 228 ECM/C3VL2071 140 250 42 450 510 57 2800 3200 9
NU 328 ECM/C3VL2071 140 300 62 780 830 88 2400 2800 25.5
NU 1030 M/C3VL2071 150 225 35 194 275 30 3200 3200 5
NU 230 ECM/C3VL2071 150 270 45 510 600 64 2600 2800 12
NU 330 ECM/C3VL2071 150 320 65 900 965 100 2200 2600 31.5

 

Single row cylindrical roller bearings have NU, NJ, NUP, N, RNU type, as well as the complete single row cylindrical roller bearings, cylindrical roller bearing without outer ring etc. Cylindrical roller bearings are also available in sealed or split designs. In sealed bearings, the rollers are protected from contaminants, water and dust, while providing lubricant retention and contaminant exclusion. This provides lower friction and longer service life. Split bearings are intended primarily for bearing arrangements which are difficult to access, such as crank shafts, where they simplify maintenance and replacements. 

And different types of cylindrical roller bearings also have their different design according to their feather, and also many kinds of cages, just like Brass cage, Pressed Steel cage, nylon cage etc.

So insulated cylindrical roller bearings also have above mentioned characteristic with normal cylindrical roller bearings.The bearings can meet the challenges of applications faced with heavy radial loads and high speeds. Accommodating axial displacement (except for bearings with flanges on both the inner and outer rings), they offer high stiffness, low friction and long service life. 

Cylindrical roller bearings with up to three times longer service life than the previous CoatMaster (China Bearing manufacturer, Top Quality standard), which is superior to all other conventional cylindrical roller bearings. The performance improvements of CoatMaster (China cylindrical roller bearings) over the past 15 years have permitted downsizing, whilst still maintaining the required performance.

Why insulated bearing used in motor?

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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

  1. High resistance

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

  1. 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.