for new technology network insulated bearings r corporation megaohm series tm
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insulated bearings megaohmtm series offering enhanced safety and reliability bearings used in electrical equipment such as motors and power generators tend to exhibit electrical pitting as a result of current leakage ntn s megaohmtm series of insulated bearings has been specifically designed to counteract electrical pitting these bearings are available in both ceramic and resin types suited to a variety of applications the megaohmtm series of insulated bearings offers the following unique advantages ¡exhibits insulation resistance of at least 100 m at 500 vdc ¡available in a wide range of variants with various insulating layer materials high voltage resistance and shock immunity that accommodate diverse user requirements ¡compatible with iso 492 din 620 and jis 1514 standards ¡available in bore diameters ranging from 50 to 160 mm the mechanism of electrical pitting an electrical current present near a bearing can flow to the inside of the bearing causing sparks that damage the rolling
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insulated bearings megaohmtm series specifications ceramic insulated bearings resin insulated bearings standard type bearing steel insulating layer outer ring rolling element cage inner ring outer ring rolling element cage inner ring protected type bearing steel protecting layer cylindrical roller bearing deep groove ball bearing cylindrical roller bearing deep groove ball bearing bearing numbers ceramic insulated bearings resin insulated bearings 7mc3-6330m2c3 clearance cage bore diameter dimension series bearing type 7mc protected ceramic layer type with high voltage resistance 7mc2 protected ceramic layer type 7mc3 standard type 7mp-nu214l1bc4p6 tolerance clearance cage bore diameter dimension series bearing type 7mp standard resin type 7mp2 heat-dissipating and creep-resistant resin type high voltage resistance 7mc 7mc2 7mc3 7mp 7mp2 5kv 3kv 3kv 5kv 5kv note the insulated bearings megaohmtm series includes a range of high-temperature models for technical assistance contact ntn engi
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insulated bearings megaohmtm series dimension tables for ceramic insulated bearings b r b2 b r r1 r1 d d d1 drdd nu type nh type cylindrical roller bearing bearing types bearing numbers boundary dimensions mm d cylindrical roller bearing d b rs min basic load ratings dynamic n cr static n cor collar ring numbers d deep groove ball bearing boundary dimensions mm d1 b1 b2 r1s min required shoulder height mm da max min 7mc n -nu214 7mc n -nu314 7mc n -nu316 7mc n -nh318 70 125 70 150 80 170 90 190 24 35 39 43 47 50 58 65 29 31 39 55 45 65 1.5 2.1 2.1 3 3 3 4 4 2 2.1 2.1 3 3 4 83 500 158 000 201 000 240 000 299 000 360 000 560 000 665 000 71 500 82 000 123 000 207 000 176 000 274 000 95 000 168 000 223 000 265 000 335 000 400 000 665 000 805 000 45 000 52 000 86 500 185 000 168 000 284 000 hj318 hj320 hj322 90 125 100 110 12 21 3 117 109 139 126.5 159 143.2 177 163.8 202 180.3 227 200.9 264 235.9 304 268.9 111 104.5 119 112.6 159 150.7 247 225.6 257 240.2 304 275.9 7mc n -nh320 100 215 7mc
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insulated bearings megaohmtm series dimension tables for resin insulated bearings brbrr1 rdddd cylindrical roller bearing bearing types bearing numbers boundary dimensions mm d d b deep groove ball bearing basic load ratings dynamic rs min n cr static n cor required shoulder height mm da max 7mp-nup208 7mp-nup210 7mp2-nu214 7mp2-nu314 7mp2-nu215 7mp-nu315 7mp-nu316 7mp2-nu217 7mp-nu1017 7mp-nu219 7mp-nu220 7mp2-6310 7mp2-6311 7mp2-6312 7mp2-6314 7mp-6215 7mp-6316 7mp2-6217 7mp-6318 7mp-6219 7mp-6319 7mp-6320 7mp-6322 7mp-6030 40 50 70 70 75 75 80 85 85 95 100 50 55 60 70 75 80 85 90 95 95 100 110 150 80 90 125 150 130 160 170 150 130 170 180 110 120 130 150 130 170 150 190 170 200 215 240 225 18 20 24 35 25 37 39 28 22 32 34 27 29 31 35 25 39 28 43 32 45 47 50 35 1.1 1.1 1.5 2.1 1.5 2.1 2.1 2 1.1 2.1 2.1 2 2 2.1 2.1 1.5 2.1 2 3 2.1 3 3 3 2.1 43 500 48 000 83 500 158 000 166 000 190 000 201 000 126 000 74 500 166 000 183 000 62 000 71 500 82 000 104 000 66 000 123 000 83 500 143 000 109
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insulated bearings megaohmtm series typical applications electric motors the insulated bearings megaohmtm series is widely used in the traction motors of railway cars the unique knowledge and experience ntn has gained from motor applications in railways where safety is the no 1 priority have contributed to the greatly improved reliability of general-purpose motors traction motors power generators the insulated bearings megaohmtm series is also used in wind power generation systems which are one solution to energy issues such as the prevention of global warming these bearings contribute to the improved reliability of eco-friendly wind power generation systems generator unit 5
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insulated bearings megaohmtm series operating precautions to avoid an accident or failure resulting from damage to insulated bearings carefully observe the following · never drop an insulated bearing or strike it directly with a hammer during installation illustrations 1 and 2 · do not use an insulated bearing if a defect is visible on the surface illustration 3 or it has an unusual appearance · attaching an electrical conductor to an insulated bearing can lower the bearing s insulation resistance · to prevent current flow from the side faces of a bearing strictly observe the mounting dimensions given in the dimension tables for required shoulder height · providing approximately 15° of relief illustrated at right at the entrance to the housing will facilitate assembly · for dc motors such as those used in railway cars earth-ground the shaft during a voltage resistance test relief at entrance of housing bore 0.5 mm minimum 10° 15° excessive shock can damage the insulating layer possibl
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