초록 ▼

A system for balancing devices having motors and rotating masses to be coupled to the motors utilizes a momentum transfer mechanism to shift the rotating mass based on sensed imbalance. In this manner the mass is shifted to a position which accounts for the inherent imbalance in both the motor and t

A system for balancing devices having motors and rotating masses to be coupled to the motors utilizes a momentum transfer mechanism to shift the rotating mass based on sensed imbalance. In this manner the mass is shifted to a position which accounts for the inherent imbalance in both the motor and the mass. A controller receives imbalance information from a velocity sensor and controls a solenoid to strike a base coupled to the motor to shift a lightly clamped mass relative to the motor. In one embodiment, a disk drive has disks initially biased by the system against a hub, and then shifted during rotation to create a disk drive having concentrically aligned disks offsetting imbalance inherent in a motor used to rotate the disks. In one embodiment, the disks are held to the hub by a clamp having screws. The screws are driven simultaneously through the same angle of rotation to ensure that the axial clamping force of each one is substantially equal. In a further embodiment, the screws are formed of a heat shrink material, and shrunk following initial light tightening to provide consistent axial clamping force.

대표청구항 ▼

[ What is claimed is:] [1.] A method of centering a disk pack in a disk drive device having a base rotatably supporting the disk pack, the method comprising:rotating the disk pack; andwhile the disk pack is rotating:sensing imbalance in the rotating disk pack to produce a time-varying signal; andres

[ What is claimed is:] [1.] A method of centering a disk pack in a disk drive device having a base rotatably supporting the disk pack, the method comprising:rotating the disk pack; andwhile the disk pack is rotating:sensing imbalance in the rotating disk pack to produce a time-varying signal; andresponsive to the time-varying signal, transferring sufficient momentum to the base to cause a relative shift between the base and the disk pack to balance the disk pack.