arrangements are described wherein fluid is supplied under pressure to lubricate and replenish the fluid film located between the rotating , inner bearing sleeve and the outer , stationary sleeve insert of the bearing assemblies of a motor . the sleeve insert is provided with fluid metering passages that permit lubricating fluid to pass through the body of the sleeve insert . the sleeve insert is disposed radially within a sleeve insert holder , and a fluid gap is defined between the two components . during operation , vibration of the rotor shaft within the stator bore is damped by the fluid spring created by the metering of fluid through the sleeve insert . as a result , friction is reduced and the lifespan of the motor increased .