Rotating mass balancing system

Details Rotating mass balancing system Rotating mass balancing system

1996-06-28

1998-10-20

Oda, Christine K.

Measuring and testing

Rotor unbalance

Dynamic

360 9806, G01M 116

Patent

active

058248986

ABSTRACT:
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.

REFERENCES:
patent: 3854347 (1974-12-01), Hellerich
patent: 4561035 (1985-12-01), McDorman et al.
patent: 4683505 (1987-07-01), Schmidt et al.
patent: 4933927 (1990-06-01), Ross
patent: 4949579 (1990-08-01), Nayar
patent: 5422776 (1995-06-01), Thorson et al.

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