Inner rotor motor and magnetic disc using same

Abstract

An inner rotor motor, comprising: a rotor with a plurality of magnetic poles arranged in a circumferential shape; located outside the circumference of the rotor, and on each magnetic pole T of a stator core having a plurality of magnetic poles T-shaped steel opposite to the rotor A stator with coils arranged on shaped steel; the stator is arranged within the range of 180 degrees to the central angle of the rotor; the coils are arranged so that the number of turns of the coils of each phase is different while making the number of turns of the coils of each phase different. The number of turns and are equal respectively. The manufacturing cost can be reduced, the miniaturization and weight reduction of the device can be realized, the stability of the rotation of the motor can be maintained, and the operation stability of the magnetic disk device can be improved.

Description

technical field [0001] The present invention relates to a thin inner rotor motor suitable for rotationally driving a medium used in, for example, a floppy disk drive, and a magnetic disk drive using the inner rotor motor. Background technique [0002] Beginning with personal computers, magnetic disk devices such as floppy disk devices have been widely used in office computers, word processors, etc., and their popularity is astonishing. Such a magnetic disk device employs, for example, the structure shown in FIG. 10 . [0003] Hereinafter, it will be briefly described with reference to the same drawing. In the figure, what is represented by symbol 101 is a case having a spindle center 102 as a rotation center of a magnetic disk, for example, it is stored in a case of a personal computer or the like (in the figure Not shown), which is opened at the front and above as a whole, and is composed of a bottomed box with a storage space where the magnetic disk cartridge 103 faces. ...

AI Technical Summary

Problems solved by technology

[0010] However, when the frame 161 and the core 163 are reduced according to the above-mentioned requirements, there is a problem as follows: that is, the magnetic interaction with the rotor 166 will be uneven in the circumferential direction, and it may not be possible to Keep the operation stability of the disk

[0011] Moreover, in order to reduce the area of ​​the core 163, it is considered to divide the structure of the core to have three frames, but in this case, since the frames are often arranged parallel to each other, the distance between the front end parts of the frames become too narrow, creating the problem that coil winding is not possible

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