Magnetic disk enclosure with detachable stator

Electrical generator or motor structure – Dynamoelectric – Rotary

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Details

310 89, 360 9904, 360 9908, H02K 2900, H02K 2122, G11B 3300

Patent

active

050085735

ABSTRACT:
A motor for a disc drive unit is spatially separated from an enclosure housing the magnetic disks and read-write heads. The disks are mounted on a hub that is fixed to a shaft extending through the hub, having bearings at either end of the shaft. One end of the shaft extends outside of the enclosure, the rotor of the motor is fixed to this end of the shaft and is concentric therewith. The rotor has a rotor housing that is cup-shaped, with an opening facing away from the interior of the enclosure. Inwardly of the rotor housing is a stator mounted on a supporting member. The supporting member is detachably mounted to the enclosure for easy access to the stator. Further, a circuit board having control elements for the motor, including a Hall element mounted thereon, is provided on the supporting member for easy access to the circuit board. Each of the coils of the stator is divided into windings, and the controller for the motor switches the number of windings used so that more of the windings are used for each coil during start-up than during the running condition, when less work is needed.

REFERENCES:
patent: 4539611 (1985-09-01), Sidhu et al.
patent: 4805054 (1989-02-01), Kamoto et al.
patent: 4894735 (1990-01-01), Takahashi et al.
"Airflow System for Disk Drive", IBM Tech. Disclosure Bulletin, vol. 29, No. 3, Aug. 86, pp. 1258-1261.

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