公开(公告)号：WO2003079348A1

公开(公告)日：2003-09-25

申请号：PCT/US2003/007531

申请日：2003-03-11

Applicant: SEAGATE TECHNOLOGY, L.L.C.

Inventor： PARSONEAULT, Norbert, Steven ,  HERNDON, Troy, Michael ,  WANG, Jim-Po

IPC: G11B19/20

CPC classification number: H02K7/09 ,  F16C17/026 ,  F16C17/045 ,  F16C17/26 ,  F16C25/02 ,  F16C33/107 ,  F16C39/06 ,  F16C2370/12 ,  G11B19/2009 ,  G11B19/2018 ,  G11B33/1473 ,  H02K5/1675

Abstract: The shaft may be supported for rotation by a conical bearing rotating within a sleeve. To prevent misalignment of the rotor and stator as the motor heats up and fluid viscosity changes, a magnetic preload is established; in a preferred embodiment, the magnetic preload is achieved using a magnetic back iron aligned with the stator magnet, the magnetic back iron being supported from the base. The shaft may further include a lower journal bearing for maintaining radial alignment and/or stiffness. A shaft may be supported for rotation relative to a sleeve by a combination of journal bearing and thrust bearing whose gaps are connected and grooved to cooperate. The bearing system includes a magnetic preload at the end of the shaft distal from the journal bearing/thrust bearing combination, the magnetic force balancing the spiral groove thrust bearing to maintain the bearing support for the shaft and the load (including hub and disc) that it supports. Further, the journal bearing balances against the thrust bearing so that as fluid is drawn further into the thrust bearing, it is withdrawn from the journal bearing to reduce the working area of the journal bearing. A reservoir terminating in a capillary seal also provided on the far side of the thrust bearing from the journal bearing. This design allows the journal bearing to drain itself as the thrust bearing spins up and its pressure increases so that the pressure of the journal bearing matches the thrust bearing.

Abstract translation: 该轴可以由在套筒内旋转的锥形轴承支撑以便旋转。 为了防止电机加热和流体粘度变化时转子和定子的不对准，建立磁性预载荷; 在优选实施例中，使用与定子磁体对准的磁性后铁实现磁性预载荷，磁性后铁从基座支撑。 轴可以进一步包括用于保持径向对准和/或刚度的下轴颈轴承。 轴可以通过轴颈轴承和推力轴承的组合而被支撑以相对于套筒旋转，其间隙被连接并开槽以配合。 轴承系统包括远离轴颈轴承/推力轴承组合的轴末端的磁力预载荷，平衡螺旋槽推力轴承的磁力，以保持轴和轴承（包括轮毂和圆盘）的载荷， 它支持。 此外，轴颈轴承与止推轴承相平衡，以便当流体进一步拉入推力轴承时，它从轴颈轴承上退出以减小轴颈轴承的工作面积。 终止于毛细管密封件的储存器也设置在止推轴承的远侧与轴颈轴承。 这种设计允许轴颈轴承随着推力轴承旋转而自身排放，其压力增加，使得轴颈轴承的压力与推力轴承匹配。