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6218-J20AA-C3 Insulated Bearing

High Precision Insulated Bearing 6218-J20AA-C3 is Deep Groove Ball Bearing design. its dimension is 90×160×30mm, it has the same dimension and the same design with normal chrome steel 6218 C3 bearing. but the most different is 6218-J20AA-C3 bearing with Aluminium Oxide Coating. the coating can Electrical Resistance Voltages up to 3000 V DC. This kind of bearing are widely used in high quality demand application like traction motor.

E-mail: sales@xrbearing.com, brandbearings@gmail.com
Skype:brandbearings
Whatsapp: 0086-13280450757
www.xrbearing.com
Availability:
  • 6218-J20AA-C3
  • EASIER
  • 628
  • USD$300

High Precision Insulated Bearing 6218-J20AA-C3 is Deep Groove Ball Bearing design. its dimension is 90×160×30mm, it has the same dimension and the same design with normal chrome steel 6218 C3 bearing. but the most different is 6218-J20AA-C3 bearing with Aluminium Oxide Coating. the coating can Electrical Resistance Voltages up to 3000 V DC. This kind of bearing are widely used in high quality demand application like traction motor.


The Coating Process

The plasma spraying process involves generating an arc between two electrodes to ionize a noble gas that is

issued from the plasma torch. The resulting plasma jet is used to carry the injected aluminum oxide powder. This powder is melted by the heat and sprayed at high speed onto the outer or inner ring. When applied in this manner, the oxide layer adheres extremely well to the base material. It is then sealed and ground to size.


Principle bearing types for traction motor applications

• cylindrical roller bearings

• electrically insulated cylindrical roller bearings

• electrically insulated deep groove ball bearings

• hybrid cylindrical roller bearings with ceramic rollers

• hybrid deep groove ball bearings with ceramic balls

• traction motor bearing units based on cylindrical roller bearings and

deep groove ball bearings

• Sensorised traction motor bearing unit

• Regreasable traction motor bearing unit


Designation Mass Dimensions R


Load Rating Fatigue
Limit Load
Limiting
Speed
Reference
Speed
EASIER (kg) d D B Min D1 D2 d dyn.Cr stat.Cor Cur

6212-M-J20B-C4 0,98 60 110 22 1,5 95,6
76,1 52 36 2,24 14 000 6 800
6213-J20B-C4 1 65 120 23 1,5 103,1
82,3 60 41,5 2,55 13 000 6 300
6313-M-J20AA-C5 2,55 65 140 33 2,1 117,5
88,6 93 60 3,95 11 000 6 400
6214-2RSR-J20AA-C3 1,11 70 125 24 1,5
110,7 86,8 62 44 2,9 12 000 6 100
6215-M-J2B-C4 1,42 75 130 25 1,5 112,8
92,5 65,5 49 3,35 11 000 5 900
6215-M-P6-J20AA-R85-105 1,42 75 130 25 1,5 112,8
92,5 65,5 49 3,35 11 000 5 900
6315-M-J20AA-C3 3,74 75 160 37 2,1 133,2
101,8 114 76,5 4,65 9 500 5 800
6016-M-J20AA 0,997 80 125 22 1,1 111
94 47,5 40 2,34 12 000 6 500
6216-J20AA-C3 1,46 80 140 26 2 121,3
98,8 72 54 3,45 11 000 5 500
6316-J20AA-C3 3,75 80 170 39 2,1 141,8
108,6 122 86,5 5,2 9 000 5 500
6316-M-J20B-C4 4,44 80 170 39 2,1 141,8
108,6 122 86,5 5,2 9 000 5 500
F-808916.6316-J20AA 3,69 80 170 39 2,1 141,8
108,6 122 86,5 5,2 9 000 5 500
6317-M-J20AA-C3 5,05 85 180 41 3 151,6
114,4 132 96,5 5,8 8 000 5 300
6218-J20AA-C3 2,21 90 160 30 2 139,4
112,3 96,5 72 4,2 9 000 5 100
6318-M-J20AA-C3 6,14 90 190 43 3 157,1
123,8 134 102 5,8 8 000 5 100
6319-M-J20AA-C4 7,05 95 200 45 3 166,9
129,1 146 114 6,4 7 500 4 950
6220-J20C-C3 3,3 100 180 34 2,1 154,8
124,7 122 93 5,4 8 000 4 800
6220-M-J20AA-R95-120 3,9 100 180 34 2,1 154,8
124,7 122 93 5,4 8 000 4 800
6320-M-J20AA-C3 8,64 100 215 47 3 179
138,6 163 134 7,4 7 000 4 650
16021-M-J20AA-C5 1,42 105 160 18 1 141,2
124,2 54 54 2,39 9 500 3 950
6322-M-J20AA-C3 11,7 110 240 50 3 197,4
153,4 190 166 8,6 6 300 4 150
6324-M-J20AA-C3 15 120 260 55 3 214,9
165,1 212 190 9 6 000 3 850
6326-M-J20AA-C3 18,3 130 280 58 4 231,2
178,9 228 216 9,8 5 600 3 500
6230-J20AA 10,3 150 270 45 3 229,1
191,6 176 170 7,8 5 600 3 350
6336-M-J20AA-C4 43 180 380 75 4 317
245,2 355 405 16,3 3 800 2 440


Typical Damage Caused by Electrical Current Passing through the Bearing


Regardless of whether a bearing was exposed to direct current or alternating current (up to frequencies in the MHz range), the resulting changes to the surface are always the same: Uniformly dull, gray marks in the raceways and on the rolling elements. These marks are not very specific and can also be caused by other factors (e. g. lubricating oil containing abrasives).


Type:

Deep groove ball bearing, cylindrical roller bearing

Inner diameter:

50 mm to 110 mm

Dimensional deviation:

Compatible with traditional bearings

Development of concept of insulated bearing


Electric Resistance

The coatings are subjected to a 100% quality inspection and guarantee a dielectric strength of at least 1000 VDC (J20AA, J20C) or 500 VDC (J20B), respectively.

 

Below this voltage, the insulating layer permits only extremely low levels of current to flow through the bearing. It offers resistance to DC currents and to

AC currents:

 

DC resistance

At room temperature, the layer typically has a

DC resistance of 1–10 GOhm, depending on the bearing size. As the temperature increases, the DC resistance

decreases exponentially, typically by approx. 40–50 % per 10 K. But even at operating temperatures of 60 °C

or even 80 °C, the insulating layer still has a resistance of several MOhm. According to Ohm’s law (I = U/R),

this means that voltages of up to 1 000 V only produce currents that are significantly below 1 mA, which are not critical for bearings.

 

AC resistance

The insulated unit acts like a capacitor (C) which can accumulate charges. When exposed to an AC voltage, this causes an alternating current to flow through the

contact area between the rolling element and raceway.

In the case of a harmonic time dependence with

angular frequency w, the rms values for current and voltage are calculated using the formula

 

E-mail: sales@xrbearing.com, brandbearings@gmail.com

Skype:brandbearings

Whatsapp: 0086-13280450757

www.xrbearing.com