Bi-compliant rotor stepper motor for an actuator in a disc drive

Details Bi-compliant rotor stepper motor for an actuator in a disc drive Bi-compliant rotor stepper motor for an actuator in a disc drive

1988-10-17

1990-01-23

Wolff, John H.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Drum record

360 9807, 360 9908, 384536, G11B 5012, F16C 102

Patent

active

048962392

ABSTRACT:
This invention provides a technique for effectively floating the rotor of a disc drive motor, thereby permitting small motions in the axial (non-critical) direction while maintaining significant stiffness in the radial (critical) direction. This is achieved by providing an electromagnetic actuator including a stepper motor having a housing, a stator located within the housing, and a rotor positionable relative to the stator driving a motor shaft to wind and unwind a band and thereby position the carriage. The drive shaft passes through ball bearings which support the shaft for rotation. The ball bearings themselves fit within an annular end bell portion of the motor housing which defines a channel for the bearing. An injected elastomer forms a tight-fitting ring between the bearings and the internal wall of the end bell, thereby radially supporting the outer race of the bearing. Preload springs are then installed on both sides of the rotor between the internal end walls of the end bells and both outer races of the bearing. The installation of these springs effectively floats the rotor to allow some distortion or movement of the rotor in the axial direction, while minimizing or eliminating the radial deflection components.

REFERENCES:
patent: 2674505 (1954-04-01), Pfenninger et al.
patent: 3015932 (1962-01-01), McCard
patent: 4011589 (1977-03-01), Gitzendanner
patent: 4323939 (1982-04-01), Iftikar et al.
patent: 4699528 (1987-10-01), Gotman

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