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B1017E New Ceramic Ball Bearings for Electrical Motors

B1017E New Ceramic Ball Bearings for Electrical Motors
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B1017E New Ceramic Ball Bearings for Electrical Motors - 1

New Ceramic Ball Bearings for Electric Motors BGSEK Our newly developed, first in Japan ceramic material makes ceramic bearings available for more applications. Ceramic rolling elements prevent electrical pitting in bearings for electric motors Our newly developed ceramic has only a slight difference in linear expansion (*) coefficient from the inner and outer ring material (bearing steel SUJ2), thus creating minimal internal clearances due to temperature change, allowing ceramic bearing use in an environment with a wide range of temperatures. *Change in a material’s length in response to a change in temperature of 1 degree Celsius. Our newly developed ceramic has similar insulation properties, strength, and durability (little change in acoustic value) with conventional silicon nitride material (Sl:N4). (See the table below for details.) JTEKT CORPORATION

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B1017E New Ceramic Ball Bearings for Electrical Motors - 2

■ Rolling fatigue life evaluation results ■ High-temperature Noise comparison test results Test equipment Test conditions Contact stress Test conditions Load causing 1/10000 deformation of ball diameter for bearing steel (SUJ2) New ceramic Standard ceramic (Si3N4) Crushing load test results This new ceramic has strength equivalent to conventional silicon nitride ceramic (Si3N4). [Electrical pitting] Due to the nature of electric motors, harmful voltage is generated by high-frequency current during operation, and above a certain voltage can produce arcing between the bearing...

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