Slim spindle motor and micro-drive apparatus comprising the same

Abstract

A slim spindle motor and a micro-drive apparatus including the slim spindle motor are provided. In the spindle motor, a hub is rotatably mounted on a base plate by ball bearings. The hub is used to seat a disk thereon. A ring-shaped magnet is engaged to the outer boundary of the hub. A stator is formed by arranging a plurality of yokes in a round shape around the outer boundary of the ring-shaped magnet. The yokes include cores having curved ends to reduce the central axis offset between the yokes and the ring-shaped magnet. Most of the yokes include coils that cover the cores. Since the central axes of the yokes in the stator are made collinear with the central axis of the ring-shaped magnet, the slim spindle motor can operate stably.

Description

BACKGROUND OF THE INVENTION [0001] This application claims the priority of Korean Patent Application No. 2002-70063, filed on Nov. 12, 2002, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference. [0002] 1. Field of the Invention [0003] The present invention relates to a spindle motor and a micro-drive apparatus including the spindle motor, and more particularly, to a spindle motor having a slim stator improved for use in mobile micro-drive apparatuses and a slim micro-drive apparatus comprising the slim spindle motor. [0004] 2. Description of the Related Art [0005]FIG. 1 is a side cross-section of a spindle motor 10 in a conventional IBM micro-drive apparatus. Referring to FIG. 1, the conventional spindle motor 10 includes a hub 11, a magnet 13, and yokes 15. The hub 11 has ball bearings 17 in the space defined by the hub 11 and is rotatably supported by a base plate 19. The magnet 13 is fastened to the hub 11 to prov...

AI Technical Summary

Benefits of technology

The present invention provides a slim spindle motor with an improved stator that reduces the central axis offset between the magnet and yokes, resulting in a slimmer motor. The motor includes a hub, ring-shaped magnet, and stator formed by arranging a plurality of yokes in a round shape around the magnet. The yokes have curved ends that reduce the offset between them and the magnet. The motor is suitable for use in a micro-drive apparatus that includes a base plate, spindle motor, and actuator. The technical effects of the invention include a slimmer motor and a slimmer micro-drive apparatus.

Problems solved by technology

However, such an arrangement is not suitable for the CF-I form having a great demand.

In particular, there is not enough space in which to install stator yokes because of the thickness of an actuator installed in the space where the stator yokes are to be located.

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