JP3259683B2 - Rotor device for disk rotation drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary drive for a disk-type storage medium such as a magnetic disk.

[0002]

2. Description of the Related Art A disk diameter of 3.5 is used as an information storage device.
Inch floppy disk drives are widely used, but recently, 1/2 inch thick, 1 inch,
There is a strong demand for 0 mm disk drives. Hereinafter, a conventional disk rotation drive device will be described.

FIG. 4 is a sectional view of a conventional rotary driving device. FIG. 5 is an explanatory sectional view of a conventional integrally formed frequency power generation magnet (hereinafter abbreviated as FG magnet). 4 and 5 , reference numeral 21 denotes a shaft;
Is a spindle hub, 23 is a drive pin, 24 is a rotor frame, 25 is an FG magnet, 26 is a hub magnet,
27 is a lubricating sheet, 28 is a rotating lever, 29 is a flange portion of the rotor frame 24, 30 is a driving magnet, 31
Is a coil, 32 is a printed circuit board, 33 is a hole for preventing FG magnet peeling, and 34 is a chamfer.

As shown in FIG. 1, a ball bearing and a sintered metal bearing are fixed to a bearing housing, and a spindle hub 22 is mounted on one of shafts 21 rotatably supported by being inserted into inner peripheral portions of both bearings. A cup-shaped rotor frame 24 having a flange portion 29 provided substantially at right angles to the shaft 21 is provided on the outer peripheral portion, and a drive magnet 30 is provided inside a hanging portion of the outer periphery of the rotor frame 24.
The FG magnet 25 is provided on the flange portion 29 on the outer periphery of the FG magnet. The bearing housing is fixed to a printed circuit board 32, and a coil 31 is wound around an insulated laminated stator core. The coil ends of each phase are soldered to the printed circuit board 32, and the stator core is mounted on the bearing housing. Fixed.

A lubricating sheet 27 is attached to the surface of the spindle hub 22, and a driving pin 2 is attached to the tip of a revolving lever 28 made of an elastic material so as to protrude upward from the surface of the lubricating sheet 27.
3 is provided, and the rotation lever 28 is rotatable around the support column. The operation of the disk rotation drive device configured as described above will be described below.

[0006] The shaft 21 is engaged with a shaft insertion hole of a disk (not shown), and the drive pin 23 is engaged with the drive pin engagement hole.
Are engaged, and the disk rotates together with the motor.
The metal disk hub is attracted to a hub magnet 26 which is formed integrally with the rotor frame 24 and magnetized, so that the spindle hub 22 on which a lubricating sheet 27 is stuck.
The disk hub adheres to the top.

[0007] The peel prevention structure of the integrally molded magnet is as follows.
As shown in FIGS. 4 and 5 , a hole is provided in the rotor frame, a chamfer is provided on the opposite side of the magnet setting surface, and the hole on the magnet setting surface side of the rotor frame is further away from the magnet setting surface. Not out. The FG magnet 25
A plurality of holes 33 for preventing the FG magnet from being peeled off are provided on a flange portion 29 provided on the outer peripheral portion of the rotor frame 24 at a substantially right angle to the shaft 21 on the side facing the printed circuit board 30. Chamfer 34 on the top side of the rotor frame to prevent the FG magnet from peeling
Is provided to prevent the FG magnet 25 from peeling off.

Also, holes 36 for integrally peeling off the magnet are provided at several positions of the rotor frame 24 at the position of the hub magnet 26, and the hub magnet 26 is fixedly formed by chamfering the inverted top surface of the rotor frame. I have.

[0009]

A conventional structure for providing a hole in a flange portion as shown in FIG. 5 and chamfering the hole on the top side of the rotor frame to prevent the FG magnet from peeling off,
The thickness is set to 0.8 mm or 0.6 mm or more.
However, when the thickness of the rotor frame is further reduced as the motor becomes thinner, for example, when the thickness of the rotor frame becomes 0.4 mm, it is very difficult to chamfer the holes provided in the flange portion. However, the heat resistance of the FG magnet deteriorates, and the FG magnet cannot be prevented from peeling off.

Similarly, a hub magnet integrally formed with a thin rotor frame also has a problem that peeling by chamfering cannot be prevented. Also say
But also low cost by rationalizing the assembly work of the entire rotor device
The demands on the case are severe. SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and a disk rotation drive device having a rotor frame integrally formed with an FG magnet and a hub magnet, which can realize a rational assembly operation and a further reduction in thickness. It is an object of the present invention to provide a low-cost rotor device.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a shaft engaged with a shaft engaging hole provided substantially at the center of a hub of a magnetic disk having a metal disk hub at the center. A rotor frame that rotates integrally with the shaft, a hub magnet having a magnetic pole portion magnetized to attract the metal disk hub on a top surface portion of the rotor frame, and a frequency power generation magnet having a flange portion. The rotor frame is provided with a press-fitting recess in which the shaft is press-fitted on the inside, a spindle hub portion of a convex disc mounting surface on which a wettable sheet is stuck, and a top face portion having a mechanical component for chucking the disc. hanging cylindrical portion of the outer periphery of the drive magnet is fixed with its vertical
A metal having a lower cylindrical portion and a flange portion provided substantially at a right angle to the shaft, and integrally having a press-fit recess, a spindle hub portion, a top surface portion, a hanging cylindrical portion, and a flange portion at least in order from the shaft to the outer periphery. The flange is provided with a plurality of holes, and the
Bend so that it sinks into the magnet setting surface
And a resin magnet are integrally formed on the flange portion and the top surface to form a frequency power generation magnet and a hub magnet, respectively, and the resin magnet is provided with the hole portion of the flange portion and the hole bending portion. Fill the above
The resin does not protrude from the top flange side, and
It has a rotor frame in which the resin magnet is filled and fixed in the hole in the top surface.

[0012]

The rotor of a rotary driving device of the disk of the embodiment of the present invention is provided with a mechanism part and the driving magnet for chucking the mounting plane and the disk of the disk,
The rotor frame has a press-fit recess recessed inside the shaft for press-fitting the shaft, a spindle hub part on the convex disc mounting surface on which a lubricating sheet is stuck, and a top face part equipped with a mechanism for chucking the disc and the drive magnet are fixed. The rotor frame comprises a metal plate integrally having a press-fit concave portion, a spindle hub portion, a top surface portion, a hanging cylindrical portion, and a flange portion in order from the shaft toward the outer periphery, Multiple on the flange
Holes on the flange and the top
Integrally molded frequency generator magnet and hub respectively
A magnet, and the resin magnet is
In this configuration, the hole and the top surface of the joint are filled and fixed.

[0013]

[0014]

[0015]

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory sectional view of a formed FG magnet portion of a rotor frame flange portion of a disk rotation drive device according to a first embodiment of the present invention, and FIG. 2 is an explanatory sectional view of a peeling prevention hole portion of the rotor frame flange portion. .

1 and 2, 4 is a rotor frame, 5 is an FG magnet, 9 is a flange portion of the rotor frame 4, 10 is a printed board, 11a is a hole for preventing the FG magnet 5 from peeling, and 12a is an FG magnet. 5 is a protrusion on the outer periphery of the hole 11a for preventing peeling, and 13a is a protrusion 1
A space made of 2a, 14 is a driving magnet, and 15 is a group of power generating wires on a printed circuit board.

FIG. 1 shows the FG magnet portion of the rotor device of the disk rotation drive device configured as described above.
This will be described with reference to FIG. A flange portion 9 provided on the outer peripheral portion of the rotor frame 4 at a substantially right angle to the shaft 1 (see FIG. 3).
An FG magnet 5 is provided, and a drive magnet 14 is fixed to the inner peripheral side of the hanging part of the rotor frame 4.
The rotor frame 4 includes a press-fitting recess in which the shaft 1 is pressed into the inside, a spindle hub portion 2 of a convex disc mounting surface on which a lubricating sheet 7 is stuck, and a top face portion having a mechanism component for chucking the disc. The rotor frame 4 includes a hanging cylindrical portion with an outer periphery to which the drive magnet 14 is fixed, and a resin frame FG magnet 5 on a flange portion 9 provided substantially perpendicular to the shaft 1 on the outer periphery of the rotor frame 4. It is made of a metal plate integrally having a press-fitting concave portion, a spindle hub portion 2, a top surface portion, a hanging cylindrical portion, and a flange portion 9 in order from the shaft 1 toward the outer periphery.

The flange 9 has a plurality of holes 11a, and projections formed by bending the outer periphery of the holes 11a from the surface opposite to the FG magnet 5 setting surface toward the setting surface. A portion 12a is provided, and is integrally molded and fixed with a resin magnet so as to fill a space 13a formed by the projection 12a of the flange portion 9, and is integrally formed with the rotor frame 4 to prevent the resin magnet F from coming off.
It has a G magnet.

The disk rotates at a constant speed, for example, 300 r.
Since the motor must be rotated at pm or 360 rpm, it is necessary to control the motor to rotate at a constant rotation speed. A magnetic pole for frequency power generation is magnetized on the FG magnet surface, and a power generating wire element group 1
5 is provided, and a voltage generated by the frequency-generating electromagnetic pole is supplied to a motor drive circuit to control the motor.

FIG. 3 is a sectional view of a disk rotation driving device according to an embodiment of the present invention. 3, 1 is a shaft, 2 is a spindle hub, 3 is a drive pin, 4 is a rotor frame, 5 is an FG magnet, 6 is a hub magnet, 7 is a lubricating sheet, 10 is a printed circuit board, and 11b is a hub magnet 6. 12b is a protrusion on the outer periphery of the hole 11b for preventing peeling of the hub magnet 6;
b is a space formed by the protrusion 12b, and 14 is a drive magnet. Since the FG magnet portion of the flange portion of the rotor frame is the same as that of the first embodiment, the description is omitted. The rotor frame 4 includes a press-fitting recess in which the shaft 1 is pressed into the inside, a spindle hub portion 2 of a convex disc mounting surface on which a lubricating sheet 7 is stuck, and a top face portion having a mechanism component for chucking the disc. The rotor frame 4 includes a hanging cylindrical portion with an outer periphery to which the drive magnet 14 is fixed, and a resin frame FG magnet 5 on a flange portion 9 provided substantially perpendicular to the shaft 1 on the outer periphery of the rotor frame 4. It is made of a metal plate integrally having a press-fitting concave portion, a spindle hub portion 2, a top surface portion, a hanging cylindrical portion, and a flange portion 9 in order from the shaft 1 toward the outer periphery.

As shown in the figure, a sintered metal bearing is press-fitted and fixed in a bearing housing, and a lower portion of the motor shaft 1 is rotatably supported. Fixed the bearing housing to the printed circuit board 10, to fix the stator core 8 that is insulated by winding a coil install them stearyl - have been installed the motor housing to the printed circuit board 10, each phase of the coil end is solder to a printed circuit board 10 To form a statuser.

A spindle hub 2 is formed by a part of the rotor frame 4 above the motor shaft 1, and a wettable sheet 7 is attached to the surface of the spindle hub 2, and the shaft 1 is attached to the rotor frame 4. It is press-fitted into the press-in recess recessed inside. The shaft 1 is provided on the outer periphery of the rotor frame 4.
The FG magnet 5 is formed by integrally molding a resin magnet on the flange 9, and the drive magnet 14 is fixed to the inner peripheral side of the hanging part of the rotor frame 4. , Constituting a rotor.
Further, a mechanical component for chucking the disk is provided on the top surface of the rotor frame of the rotor.

The hub magnet portion of the rotor device of the disk rotation drive device configured as described above will be described below. The drive principle of the disk is the same as the conventional device,
The shaft 1 is engaged with the shaft engaging hole of the disk, the driving pin 3 is engaged with the driving pin engaging hole, and the disk rotates integrally with the motor. A disk hub is mounted on the spindle hub portion 2 on which the lubricating sheet 7 is stuck, and the metal disk hub is integrally formed with the rotor frame 4 and is attracted by a magnetized hub magnet 6.

The plurality of holes 11b provided at several positions on the top surface of the rotor frame 4 at the corresponding positions of the hub magnet 6, and the outer peripheral portions of the plurality of holes 11b are positioned from the surface opposite to the hub magnet 6 setting surface. A projection 12b which is bent so as to sink into the setting surface is provided, and a space 13b formed by the projection 12b at the position of the hub magnet 6 is integrally molded with the rotor frame 4 and a resin magnet to fill the hub. The magnet 6 is formed and fixed, and the rotor frame 4 is provided with the hub magnet 6 which is integrally formed together with the FG magnet 5 to prevent peeling.

[0026]

[0027]

[0028]

[0029]

[0030]

[0031]

[0032]

[0033]

[0034]

[0035]

[0036]

[0037]

[0038]

[0039]

[0040]

[0041]

[0042]

[0043]

[0044]

[0045]

[0046]

[0047]

As described above, according to the structure of the present invention, a plurality of holes provided in a thin flange can be formed by a press working step, so that the resin-made integrally formed FG magnet can be easily prevented from coming off. it can. Further, the same peeling prevention can be applied to a hub magnet integrally formed. Even when the rotor frame material is thinned, the FG magnet and the hub magnet can be integrally formed, so that a thin motor can be realized.

Further , in the embodiment, the rotor frame has a press-fitting recess in which a shaft is press-fitted inside, a spindle hub portion of a convex disc mounting surface on which a wet sheet is stuck, and a mechanism component for chucking the disc. The rotor frame is provided with a cylindrical portion and a frame portion on the outer periphery to which the drive magnet is fixed, and the rotor frame includes a press-fitting concave portion, a spindle hub portion 2 a top surface portion, a hanging cylindrical portion, and a flange portion in order from the shaft toward the outer periphery. It is made of a metal plate that is integrated. Then press-fit the shaft of the rotor frame
Press-fit recess, spindle hub 2 top surface, and hanging cylinder
Conventionally, the flange is made from an integral metal plate
Conventional configuration in which the handle hub is created and assembled with separate parts
It is said that it has become possible to streamline work and reduce parts compared to
Needless to say.

Since the metal flange acts as the back yoke of the FG magnet, a high frequency power generation voltage can be obtained, and the rotation accuracy of the motor can be stably obtained. In addition, a thin motor can be provided which has good surface deflection on which the magnetic pole for frequency generation is magnetized and has good motor jitter.

[0050]

Further, since the stopper for preventing the rotor from coming off when an impact is applied to the apparatus hits the FG magnet at the time of impact, a fixing strength that can withstand the impact force is necessary for fixing the FG magnet to the rotor frame. Since the FG magnet alone cannot withstand, the impact countermeasure can be implemented with the metal flange portion formed in the FG magnet portion.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view of a molded FG magnet of a flange portion of a rotor frame according to an embodiment of the present invention.

FIG. 2 is an explanatory sectional view of a hole for preventing peeling of a flange portion of a rotor frame in an embodiment of the present invention.

FIG. 3 is a sectional view of a disk rotation drive device according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view of a conventional disk rotation drive device.

FIG. 5 is an explanatory sectional view of a molded FG magnet portion of a flange portion of a rotor frame in a conventional example.

[Description of Signs ] 1 Shaft 2 Spindle Hub 3 Drive Pin 4 Rotor Frame 5 FG Magnet 6 Hub Magnet 7 Lubricious Sheet 8 Stator Coil 9 Rotor Frame Flange 10 Printed Circuit Board 11a FG Magnet Peeling Prevention Hole 11b Hub Magnet projection of preventing the hole periphery peeling prevention hole 12a FG magnet peeling
Part 12b Protrusion on the outer periphery of the hub magnet peeling prevention hole
Part 13a Space 13b formed by protrusion 12a Space 14 formed by protrusion 12b Drive magnet 15 Power generation element group on printed circuit board

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H02K 29/00 G11B 19/20 H02K 21/00

Claims (1)

(57) [Claims] A shaft engaged with a shaft engaging hole provided substantially at a center of the hub of the magnetic disk having a metal disk hub at a center, a rotor frame rotating integrally with the shaft, and the metal; A hub magnet having a magnetic pole portion magnetized to attract the disk hub made on the top surface portion of the rotor frame, and a frequency power generation magnet provided on a flange portion, and the rotor frame sinks inside the shaft for press-fitting the shaft. hanging cylindrical portion of the outer circumference written not been pressed recess and the Jun with the spindle hub portion of the convex disk mounting surface which is affixed a sheet and top surface having a chucking to mechanical components of the disk drive magnets are fixed and their
And a flange portion provided substantially at right angles to the shaft in the hanging cylinder portion , and integrally have a press-fitting recess, a spindle hub portion, a top surface portion, a hanging cylinder portion, and a flange portion at least in order from the shaft toward the outer periphery. It is made of a metal plate and has a plurality of holes in the flange ,
Bending so that it sinks into the magnet setting surface side
A hole bending is provided a processed portion was subjected to a top surface the flange portion of the resin magnet comprise an integral molded respectively Magnets frequency power generation and the hub magnet, bending the hole and the hole portion of the resin magnet is the flange Fill the processing part
The resin does not protrude from the surface of the flange part on the top side,
A rotor frame in which the resin magnet is filled and fixed in a hole in a top surface portion thereof.