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According to NSK bearing characteristic analysis: due to the original NU-NSK bearing motor, allow the motor shaft to a rocky ledge. Bearing flanges on both sides of the inner ring, outer ring has no flanges, thereby allowing bi-directional displacements shaft relative to the housing can bear axial elongation caused by thermal expansion. While NSK bearings for excessive bearing clearances, but mechanical linear bearing, better than NSK bearing point. Bearing movement is not a circle but an ellipse, which is by a dry ditch columns (or NSK) and the gap between the raceways, runtime loading of different trajectories into ovals. Force mainly in the lower bearing, deep groove bearings westbank effort as a straight line, high-speed operation, due to the bearing gap, westbank effort changed stress trajectory into a parabolic curve.
Feed pump motor mount is mainly affected by axial force effects, and drag the load smoothly, the radial deep groove bearings allow rocky ledge need less change of front bearing with NSK bearings, bearing clearance C3, 0.04mm, you can meet the operational requirements. While taking into account the expansion of the bearing, deflector small caps and a thickness of about 0.8mm gaskets, overcome from the feed-water pump and bearing temperature rise due to a rocky ledge.
NSK bearing rolling element and Raceway micro table surface is coarse, motion occurs in a certain impact, but this impact pulse is high frequency and vibration measurement by using measurement of motor run parameter values than standard high-frequency interference. More deep groove bearings with raceways-contact, have a high frequency of impact, NSK bearings and raceways of contact points, have a high frequency of impact is relatively small, this motor can be used instead of deep groove bearings NSK bearings, solve the noise device.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7326ADF NSK | 130 | 280 | 58 |
| 7226BDF NSK | 130 | 230 | 40 |