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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
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
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
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