JP2591057Y2 - 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. Recently, a 1/2 inch thick, 10 inch
mm disk units are strongly demanded.

[0003] A conventional disk rotation driving device will be described below. FIG. 11 shows a sectional view of a conventional rotary drive device. FIG. 12 shows a conventional integrally formed frequency generator magnet (hereinafter abbreviated as FG magnet).
It is sectional explanatory drawing of a part. 11 and 12, 21 is a shaft, 22 is a spindle hub, 23 is a drive pin, 2
4 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 drive magnet, 31 is a coil, 32 is a printed circuit board, 33 is an FG magnet peeling prevention hole, and 34 is a chamfer.

[0004] As shown in the figure, a ball bearing and a sintered metal bearing are fixed to a bearing housing, and are inserted through a spindle hub 22 into one of shafts 21 which are inserted into the inner peripheral portions of both bearings and rotatably supported. A cup-shaped rotor frame 24 having a flange portion 29 provided substantially at right angles to the shaft 21 on the outer peripheral portion, and a drive magnet 30 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 fixed to the bearing housing. .

A lubricating sheet 27 is stuck on the surface of the spindle hub 22, and a driving pin 2 is attached to the tip of an elastic rotating lever 28 so as to protrude upward from the surface of the lubricating sheet 27.
3 is provided, and the rotation lever 28 is rotatable about a support.

The operation of the above-structured disk drive will be described below.

The shaft 21 is engaged with a shaft engaging hole of a disk (not shown), and the driving pin 23 is engaged with the driving pin engaging 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.

[0008] The peeling prevention structure of the integrally molded magnet is as follows.
As shown in FIGS. 11 and 12, a hole is provided in the rotor frame, and a chamfered portion is provided on the opposite side of the magnet setting surface. Not out.

The FG magnet 25 is connected to the rotor frame 2
4 is formed on the side facing the printed circuit board 30 of a flange 29 provided substantially at right angles to the shaft 21, and a plurality of holes 3 for preventing the FG magnet from coming off are formed in the flange 29.
3 is provided, and a chamfered portion 34 for preventing the FG magnet from peeling is provided on the rotor frame top surface side of the hole to prevent the FG magnet 25 from peeling.

[0010] Further, integrally formed magnets are provided with holes 36 for preventing peeling off at several positions of the rotor frame 24 at the position of the hub magnet 26, and the hub frame 26 is fixedly formed by chamfering the inverted top side of the rotor frame. I have.

[0011]

A conventional structure in which a hole is formed in a flange portion as shown in FIG. 12 and the hole is chamfered on the top side of the rotor frame to prevent the FG magnet from peeling off has a plate thickness of 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 a hole provided in the flange portion. Heat resistance such as a heat cycle test deteriorates, and there is a problem that peeling of the FG magnet cannot be prevented.

Similarly, a hub magnet integrally formed on a thin rotor frame also has a problem that peeling by chamfering cannot be prevented.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems. The rotation of a disk having a rotor frame integrally formed with an FG magnet and a hub magnet capable of rationalizing an assembling operation and achieving a further reduction in thickness. An object of the present invention is to provide an inexpensive rotor device for a driving device.

[0015]

In order to achieve this object, a rotor device for a rotary drive of a disk according to the present invention comprises a disk mounting surface, a mechanical component for chucking the disk, and a drive magnet. A rotor frame according to claim 1 or 2, comprising a top surface portion, a hanging cylindrical portion and a flange portion on an outer periphery to which a drive magnet is fixed, and a metal having the top surface portion, the hanging cylindrical portion, and the flange portion integrally. The rotor device of the invention according to claims 3 to 5, wherein the rotor frame is made of a magnetic metal plate having an outer peripheral hanging cylindrical portion to which a driving magnet is fixed, and the rotor frame is provided on the outer peripheral portion of the rotor frame. Is provided with a separate flange frame and FG magnet, that is, the rotor portion is divided into a rotor frame and a flange frame to form a separate member. Rui the arrangement as a single same material having a flange portion on the rotor frame. Claim 2
The hub magnet described in (1) is fixed together with the FG magnet to the rotor frame by integral molding. To fix the hub magnet, several holes are formed on the top surface of the rotor frame at the position of the hub magnet on the hub magnet side by a pressing process and the holes. A hole for preventing peeling having a frame projection provided with a hole bent portion which is bent so as to sink down from the surface opposite to the hub magnet setting surface to the setting surface side is provided on the outer circumference of the hub magnet.
Further, in a device in which a resin magnet is integrally molded and fixed to a flange portion or a flange frame of a rotor frame of a rotor portion, an FG magnet is formed. And a protrusion having a plurality of holes and a hole-bending portion formed by bending the outer peripheral portions of the plurality of holes from the surface opposite to the FG magnet setting surface toward the setting surface side. A plurality of holes are provided for preventing the magnet from coming off even in the case of a thin frame material.
The G magnet is simultaneously formed integrally with the rotor frame of the rotor section. Also, a rubber FG magnet is attached to the surface of the ring-shaped metal flange frame, and the end face of the inner diameter portion of the flange frame is fixed to the outer peripheral portion of the rotor frame.
As a method of fixing the FG magnet to the rotor frame by integral molding, according to claim 5, a plurality of projecting holes formed on the flange portion of the rotor frame on a surface opposite to the FG magnet setting surface. And a stepped portion protruding on the outer peripheral end surface of the flange portion so as to protrude toward the FG magnet setting surface side. The FG magnet fills a plurality of projecting holes provided in the flange portion, and It is a means formed and fixed so as to sandwich the projecting stepped portion. According to a sixth aspect of the present invention, the magnet for the frequency generator is formed integrally with the rotor frame so as to prevent a part of the rotor frame from being removed in the pressing step of the chamfered portion and to prevent the hole from being integrally formed. In the seventh aspect, the outer peripheral end face of the flange portion of the rotor frame is cut out, and a gate opening for magnet molding is provided in the notched portion to stably form the resin magnet integrally with the rotor frame. In claim 8, a notch is provided in an outer peripheral end surface of a flange portion of the rotor frame, and the notch end surface of the flange portion forms a stepped portion on a side opposite to the FG magnet setting surface, and a hole portion of the flange portion is provided. The resin magnet is integrally formed with the rotor frame at the stepped portion and the stepped portion, and a gate port for the formation is provided at the cutout portion.

In the rotor frame at the position of the hub magnet, holes are provided at several places on the side of the hub magnet for preventing peeling, which have a frame projection. Further, the flange portion of the rotor portion is provided with a plurality of holes for preventing peeling having projections on the FG magnet side, so that the effect of preventing magnet peeling can be obtained even in the case of a thin frame material. It is formed integrally with the rotor frame.

Further, a rubber FG magnet is attached to the surface of the ring-shaped metal flange frame, and the end face of the inner diameter portion of the flange frame is fixed to the outer peripheral portion of the rotor frame.

[0018]

The structure in which the hub magnet and the FG magnet are integrally formed on the rotor frame can streamline the assembling work.

Since the magnet is formed integrally with the thin-walled rotor frame, the rotor structure of the thin rotary drive can be supplied at low cost.

[0020]

(Embodiment 1) A first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view of a formed FG magnet section of a rotor frame flange of a disk rotation driving device according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view of a peel prevention hole of the rotor frame flange. FIG.

1 and 2, reference numeral 4 denotes a rotor frame;
5 is an FG magnet, 9 is a flange of the rotor frame 4, 10 is a printed circuit board, 11a is a hole for preventing the FG magnet 5 from peeling, 12a is a protrusion on the outer periphery of the hole for preventing the FG magnet 5 11a, and 13a is a protrusion. Projection 12a
, 14 is a drive magnet, and 15 is a group of power generating wires on the 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.

The shaft 1 is mounted on the outer periphery of the rotor frame 4.
An FG magnet 5 is provided on a flange portion 9 provided substantially at a right angle to (see FIG. 3), and a drive magnet 14 is fixed to the inner peripheral side of the hanging portion of the rotor frame 4.

The flange 9 has a plurality of holes 11a, and the outer periphery of the holes 11a is bent in a press working step so as to sink from the surface opposite to the FG magnet 5 setting surface toward the setting surface. The protrusion 12a provided is provided, and the flange 9
And a resin magnet FG magnet integrally formed with a resin magnet and fixed so as to fill a space 13a formed by the projection 12a, and integrally formed with the rotor frame 4 to prevent peeling.

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 speed. A magnetic pole for frequency generation is magnetized on the FG magnet surface,
A power generating coil composed of a group of power generating wires 15 is provided on the surface of the printed circuit board 10 on the opposite side, and a voltage generated by the magnetic pole for frequency generation is supplied to a motor drive circuit to control the motor.

(Embodiment 2) Hereinafter, a second embodiment of the present invention will be described with reference to the drawings.

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

In FIG. 3, 1 is a shaft, 2 is a spindle hub, 3 is a drive pin, 4 is a rotor frame, and 5 is an F
G magnet, 6 is a hub magnet, 7 is a moisture sheet,
Reference numeral 8 denotes a stator core, 10 denotes a printed board, 11b denotes a hole for preventing peeling of the hub magnet 6, 12b denotes a protrusion on the outer periphery of the hole 11b for preventing peeling of the hub magnet 6, and 13b.
Is a space formed by the protrusions 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.

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. The bearing housing is fixed to the printed circuit board 10, and the stator housing to which the insulated stator core 8 around which the coil is wound is fixed and attached is mounted on the printed circuit board 10, and the coil ends of each phase are soldered to the printed circuit board 10. Is configured.

A part of the rotor frame 4 constitutes a spindle hub portion 2 above the motor shaft 1, and a wettable sheet 7 is attached to a surface of the spindle hub portion 2, and the shaft 1 is attached to the rotor frame 4. It is press-fitted. An outer peripheral portion of the rotor frame 4 is provided with a flange portion 9 provided substantially at right angles to the shaft 1, and an FG magnet 5 is integrally formed with a resin magnet on the flange portion 9. The drive magnet 14 is fixed to the side to form 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 driving principle of the disk is the same as that of the conventional device, and the shaft 1 is engaged with the shaft engaging hole of the disk.
The drive pin 3 is engaged with the drive pin engagement hole, and the disk rotates together with the motor. A disk hub is placed 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 position of the hub magnet 6, and the outer peripheral portions of the plurality of holes 11b are set from the surface opposite to the hub magnet 6 setting surface. A protrusion 13b which is bent so as to sink into the surface side is provided, and a space 13b formed by the protrusion 12b at the position of the hub magnet 6 is integrally molded with the rotor frame 4 and a resin magnet to be filled. The rotor frame 4 is provided with a hub magnet 6 which is integrally formed together with the FG magnet 5 to prevent peeling.

Embodiment 3 Hereinafter, a third embodiment of the present invention will be described with reference to the drawings.

FIG. 4 is a sectional view showing a molded FG magnet portion of a flange portion of a flange frame of a disk rotation drive device according to a third embodiment of the present invention.

In FIG. 4, 4 is a rotor frame and 5 is F
G magnet, 10 is a printed circuit board, 11a is a hole for preventing the FG magnet 5 from peeling, 12a is a protrusion on the outer periphery of the hole for preventing the FG magnet 5 11a, 13a is a space formed by the protrusion 12a, and 14 is a drive. Magnet, 15
Is a power generation line element group on the printed circuit board 10, 16 is a flange frame, 16a is a flange portion of the flange frame 16,
Reference numeral 16b denotes a portion that covers the outer peripheral portion of the hanging portion of the rotor frame of the flange frame 16.

FIG. 4 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.

The FG magnet 5 is provided on the outer peripheral portion of the rotor frame 4 via a flange frame 16, and the driving magnet 14 is fixed to the inner peripheral side of the hanging portion of the rotor frame 4.

The flange frame 16 is fixed to the rotor frame 4 by a portion 16b covering the outer peripheral portion of the hanging portion of the cup-shaped rotor frame 4.
The notch 16c as shown in FIG. 4 is provided in several places of the cylindrical cover 16b, and the cylindrical cover 1 of the flange frame 16 is provided.
The rotor frame 4 and the flange frame 16 are fixed by bonding or welding at the cut portions 16c so that no trace of adhesive or welding spatter is formed from the outer diameter of 6b.

Further, a plurality of holes 11a are formed in the flange portion 16a of the flange frame 16, and the outer peripheral portions of the plurality of holes 11a are lowered from the surface opposite to the FG magnet 5 setting surface toward the setting surface. Projection 1 with bending process
2a is provided, and the FG magnet 5 is integrally molded so as to fill a space 13a formed by the protrusion 12a of the flange portion 16a with a resin magnet to prevent peeling.

By forming the cup-shaped rotor frame 4 and the flange frame 16 into two pieces, the thickness of the flange frame 16 is made thinner than the thickness of the rotor frame 4, and the first thickness is reduced by the thickness. The FG magnet section can be made thinner than in the embodiment.

(Embodiment 4) Hereinafter, a fourth embodiment of the present invention will be described with reference to the drawings.

FIG. 5 is an explanatory sectional view of a formed FG magnet portion of a flange portion of a flange frame of a disk rotation drive device according to a fourth embodiment of the present invention.

In FIG. 5, reference numeral 4 denotes a rotor frame, and 5 denotes F
G magnet, 10 is a printed circuit board, 11a is a hole for preventing the FG magnet 5 from peeling, 12a is a protrusion on the outer periphery of the hole for preventing the FG magnet 5 11a, 13a is a space formed by the protrusion 12a, and 14 is a drive. Magnet, 15
Is a power generation line element group on the printed circuit board 10, 16 is a flange frame, 16a is a flange portion of the flange frame 16,
Reference numeral 16d denotes a portion bent toward the FG magnet which covers the outer peripheral portion of the hanging portion of the rotor frame of the flange frame 16.

FIG. 5 shows the FG magnet section of the rotor device of the disk rotation drive device configured as described above.
This will be described with reference to FIG. The fourth embodiment is similar to the third embodiment, so only different points will be described.

The cylindrical covering portion 16 of the flange frame 16 fixed to the outer peripheral portion of the hanging portion of the cup-shaped rotor frame 4
d is bent to the FG magnet side. Therefore, the flange frame 16 can be fixed by the elastic force of the thin flange frame 16. The flange frame 16 has a plurality of holes 11 a in the flange portion 16 a of the flange frame 16, and the outer peripheral portions of the plurality of holes 11 a correspond to the FG magnet 5 setting surface. Is a projection 1 which is bent so as to sink from the opposite surface to the setting surface side.
2a is provided, and a resin magnet FG magnet 5 which is integrally formed so as to fill a space 13b formed by the protrusion 12a of the flange portion 16a with a resin magnet and prevents peeling is provided. After the FG magnet is formed by integral molding only with the flange frame 16, the FG magnet can be fixed to the outer peripheral portion of the hanging portion of the rotor frame 4, or the FG magnet 5 can be integrated with the rotor frame 4 to which the flange frame 16 is fixed. It can also be integrally molded,
In this case, the cylindrical cover 1 is formed by the filling pressure of the FG magnet.
6d is more firmly fixed.

Embodiment 5 Hereinafter, a fifth embodiment of the present invention will be described with reference to the drawings.

FIG. 6 is an explanatory sectional view of a FG magnet portion of a flange portion of a flange frame of a disk rotation drive device according to a fifth embodiment of the present invention.

In FIG. 6, reference numeral 4 denotes a rotor frame, and 5 denotes F
G magnet, 10 is a printed circuit board, 14 is a drive magnet, 15 is a power generation line element group on the printed circuit board 10, and 16 is a flange frame.

FIG. 6 shows the FG magnet section of the rotor device of the disk rotation drive device configured as described above.
This will be described with reference to FIG.

Ring-shaped metal flange frame 1
The FG magnet 5 made of rubber is attached to the six surfaces, and the end face of the inner diameter portion of the flange frame 16 is fixed to the outer peripheral portion of the hanging portion of the cup-shaped rotor frame 4 so that the shaft 1 is attached to the outer peripheral portion of the rotor frame 4. The rotor device of the disk rotation drive device provided with the FG magnet 5 at a right angle to (see FIG. 3).

In the first, second, third and fourth embodiments, the FG
Although the magnet is made of resin so that the magnet is formed integrally with the flange, in the case of a thin FG magnet, if a ring-shaped rubber FG magnet 5 is attached to the flange, concentricity is improved. Since it is difficult to attach the FG magnet to the expensive FG magnet part, if the material in which the FG magnet material is previously bonded to the flange frame material is punched in a ring shape, the FG magnet 5 and the flange frame 16 have the same concentric FG magnet. Parts can be inexpensive.

Embodiment 6 Hereinafter, a sixth embodiment of the present invention will be described with reference to the drawings.

FIG. 7 is a sectional view of a hole for preventing the flange portion of the rotor frame from peeling off according to a sixth embodiment of the present invention. Since the peeling prevention hole (FIG. 2) of the first embodiment is formed by the present invention (FIG. 7), only the peeling prevention part will be described.

In FIG. 7, 17a is a hole for preventing the magnet from peeling off, and 17b is a hole 1 for preventing the magnet from peeling off.
A chamfered portion 7a and a projection 17c project a part of the frame from the magnet setting surface side of the rotor frame beyond the setting surface.

In a disk rotation drive device provided with a magnet for a frequency generator on a flange provided substantially at right angles to the shaft on the outer periphery of the rotor frame, a plurality of holes 17a as shown in FIG. 7 are provided in the flange. Further, a chamfered portion 17b is provided on the outer peripheral portion of the plurality of holes on the side opposite to the magnet setting surface for the frequency generator, and in the pressing step of the chamfered portion, the magnet setting surface for the frequency generator of the rotor frame is formed. The projection 17 which protrudes a part of the frame from its setting surface
The magnet for the frequency generator is integrally formed with the rotor frame to prevent the plurality of holes from being integrally formed and to prevent peeling.

(Embodiment 7) Hereinafter, a seventh embodiment of the present invention will be described with reference to the drawings.

FIG. 8 is an explanatory sectional view of a molded FG magnet portion of a flange portion of a rotor frame of a disk rotation drive device according to a seventh embodiment of the present invention.

In FIG. 8, reference numeral 4 denotes a rotor frame, and 5 denotes an F frame.
G magnet, 9 is a flange portion of the rotor frame 4, 1
Reference numeral 0 denotes a printed board, 11a denotes a hole for preventing the FG magnet 5 from peeling, 12a denotes a protrusion on the outer periphery of the hole for preventing the FG magnet 5 11a, 13a denotes a space formed by the protrusion 12a, 14 denotes a driving magnet, 15 Is a power generating wire element group on the printed circuit board, 18a is a stepped portion, 18b is a stepped portion 1
8a is a magnet setting surface side protrusion.

FIG. 8 shows the FG magnet section of the rotor device of the disk rotation drive device configured as described above.
This will be described with reference to FIG.

The driving principle of the disk is the same as that of the conventional device, and the hole for preventing the FG magnet from peeling off of the rotor device is the same as in the first embodiment. The following description focuses on the protruding stepped portion provided on the outer peripheral end face of the flange portion of the rotor frame.

The FG magnet 5 is formed on the outer peripheral portion of the rotor frame on the side facing the printed circuit board 10 of a flange portion 9 provided substantially at right angles to the shaft 1. The flange portion 9 has a plurality of holes for preventing the magnet from coming off. A portion 11a is provided;
A projection 12a is formed by bending the outer periphery of the plurality of holes 11a so as to sink from the surface opposite to the FG magnet 5 setting surface to the setting surface side. A stepped portion 18a protruding the FG magnet 5 setting surface side from the rotor frame top surface side,
A part of the stepped portion 18a protrudes from the FG magnet setting surface to form a projection 18b, and the hole of the flange portion 9 and the stepped portion are separated from the flange surface on the top side of the rotor frame by F.
The G magnet is prevented from coming out, and the stepped portion 18a is held by the FG magnet from the outer periphery to prevent the FG magnet from coming off.

Embodiment 8 Hereinafter, an eighth embodiment of the present invention will be described with reference to the drawings.

FIG. 9 is an explanatory sectional view of a molded FG magnet portion of a flange portion of a rotor frame of a disk rotation drive device according to an eighth embodiment of the present invention.

In FIG. 9, reference numeral 4 denotes a rotor frame, and 5 denotes an F frame.
G magnet, 9 is a flange portion of the rotor frame 4, 1
Reference numeral 0 denotes a printed circuit board, and reference numeral 19 denotes a notch provided on the outer peripheral end surface of the flange.

FIG. 9 shows the FG magnet section of the rotor device of the disk rotation drive device configured as described above.
This will be described with reference to FIG.

The hole for preventing the FG magnet from peeling off and the protruding stepped portion of the rotor device are the same as those of the seventh embodiment, and therefore the description thereof is omitted. The following description focuses on the notch 19 provided on the outer peripheral end face of the flange portion of the rotor frame.

The FG magnet 5 is formed on the outer peripheral portion of the rotor frame on the side facing the printed circuit board 10 of a flange portion 9 provided substantially at right angles to the shaft 1. The flange portion 9 has a plurality of holes for preventing the magnet from coming off. A portion and a stepped portion are provided to prevent the FG magnet 5 from coming off. The outer peripheral end surface of the flange portion is cut out, and a gate port for magnet formation is provided in the cutout portion 19 so that the FG magnet 5 is integrally formed with the rotor frame 4. Since the parting surface of the mold is opposite to the magnet setting surface of the flange,
There are no burrs at the corners of the magnet on the printed circuit board 10 side, the burrs do not contact the printed circuit board 10, and the gap between the printed circuit board 10 and the surface of the FG magnet 5 can be formed as it is.

(Embodiment 9) Hereinafter, a ninth embodiment of the present invention will be described with reference to the drawings.

FIG. 10 is a sectional view showing a cutaway portion of a flange portion of a rotor frame of a disk rotation drive device according to a ninth embodiment of the present invention.

In FIG. 10, reference numeral 9 denotes a flange portion of the rotor frame, reference numeral 19 denotes a notch provided on the outer peripheral end face of the flange, and reference numeral 19b denotes a stepped portion of the notch 19 protruding.

The notched portion of the flange portion of the rotor frame of the rotor device of the disk rotation drive device configured as described above will be described with reference to FIG.

The present invention is characterized in that a stepped portion is provided in a cutout portion provided on the outer peripheral end surface of the flange portion of the rotor frame of the eighth embodiment.

The outer peripheral end surface of the flange portion is cut out, and a gate opening for magnet molding is provided in the cutout portion 19.
The FG magnet is integrally formed with the rotor frame. When removing the spool of the magnet after molding, the magnet in the notch portion 19 of the gate portion may come off.
The G magnet setting surface side constitutes a stepped portion protruding from the opposite surface to prevent the magnet of the gate portion from coming off.

[0076]

[Effects of the Invention] As described above, in the structure of the present invention, a plurality of holes provided in a thin flange and a projection around the hole can be formed by a press working process, and the resin-made integrally formed FG magnet is peeled off. Prevention can be easily performed. Further, the method of preventing peeling 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.

In the first to third and seventh to ninth embodiments, the FG magnet is formed from a fat magnet in which the FG magnet is integrally formed with a flange provided substantially perpendicular to the shaft on the outer periphery of the rotor frame. This is the FG magnet to be configured. In the fourth to fifth embodiments, the thickness of the flange frame is made thinner than that of the rotor frame by forming the cup-shaped rotor frame having no flange portion, the flange frame, and the two pieces, thereby reducing the thickness of the rotor frame. The FG magnet portion can be made thinner by the thickness. 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.

As a method of fixing the FG magnet to the rotor frame by integral molding, in the sixth embodiment, the flange portion of the rotor frame is provided with a plurality of flanges on the surface opposite to the FG magnet setting surface. And a stepped portion protruding on the outer peripheral end surface of the flange portion so as to protrude toward the FG magnet setting surface side. The FG magnet fills the plurality of holes provided in the flange portion, and The fixing strength of the FG magnet is improved by being formed and fixed so as to sandwich the protruding stepped portion. In the seventh and eighth embodiments, the outer peripheral end surface of the flange portion of the rotor frame is cut out, and a gate opening for magnet molding is provided in the cutout portion, and the resin magnet is integrally formed with the rotor frame to form the gate opening. The size of the resin magnet can be sufficiently secured, and stable resin magnet molding can be performed. In the eighth embodiment, a notch is provided in the outer peripheral end surface of the flange portion of the rotor frame, and the notch end surface of the flange portion forms a stepped portion on the side opposite to the FG magnet setting surface, and the flange portion has a stepped portion. Since the resin magnet is integrally formed with the rotor frame in the hole and the stepped portion, the resin magnet is filled not only in the hole in the flange portion but also in the stepped portion, so that the fixing strength of the FG magnet is improved. Since the stopper for preventing the rotor from coming off when an impact is applied to the device hits the FG magnet at the time of impact,
A fixing strength that can withstand an impact force is necessary for fixing the FG magnet portion and the rotor frame. Since the FG magnet alone cannot withstand it, the FG magnet is integrally molded with the metal flange and the flange frame to improve the fastening strength, so that the metal flange part of the FG magnet can be used to prevent impact. it can.

[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 a first embodiment of the present invention.

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

FIG. 3 is a cross-sectional view of a disk rotation driving device according to a second embodiment of the present invention;

FIG. 4 is an explanatory sectional view of a molded FG magnet of a flange portion of a flange frame according to a third embodiment of the present invention.

FIG. 5 is an explanatory sectional view of a molded FG magnet of a flange portion of a flange frame according to a fourth embodiment of the present invention.

FIG. 6 is an explanatory sectional view of a molded FG magnet of a flange portion of a flange frame according to a fifth embodiment of the present invention.

FIG. 7 is an explanatory sectional view of a molded FG magnet portion of a flange portion of a rotor frame according to a sixth embodiment of the present invention.

FIG. 8 is an explanatory sectional view of a molded FG magnet portion of a flange portion of a rotor frame according to a seventh embodiment of the present invention.

FIG. 9 is an explanatory sectional view of a molded FG magnet portion of a flange portion of a rotor frame according to an eighth embodiment of the present invention.

FIG. 10 is a sectional view illustrating a cutaway portion of a flange portion of a rotor frame according to a ninth embodiment of the present invention.

FIG. 11 is a cross-sectional view of a conventional disk rotation drive device.

FIG. 12 is an explanatory sectional view of a formed 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 Core 9 Flange 10 Printed Circuit Board 11a Hole Prevention of FG Magnet 11b Hub Magnet Prevention Hole 12a Projection on the periphery of hole for preventing peeling of FG magnet 12b Projection on the periphery of hole for prevention of separation of hub magnet 13a Space formed by protrusion 12a 13b Space formed by protrusion 12b 14 Drive magnet 15 Print Generating wire element group on substrate 16 Flange frame 16a Flange portion of flange frame 16b, 16d Cylindrical covering portion of flange frame 16c Cut portion 17a Hole for preventing magnet peeling 17b Chamfering portion for magnet peeling preventing hole 17a 1 7c Projection portion of frame protruding from magnet setting surface 18a Stepped portion 18b Projection portion on magnet setting surface side of stepped portion 18a 19 Notch portion provided on outer peripheral end surface of flange portion 19b Notch portion 19b Projected step

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H02K 29/00 G11B 19/20 H02K 11/00 H02K 21/00

Claims (8)

(57) [Scope of request for utility model registration] 1. A disk rotation drive apparatus comprising a rotor frame provided with a magnet for a frequency generator on a flange integral with a rotor frame provided substantially at right angles to a shaft on an outer periphery of the rotor frame, wherein the flange has a plurality of holes. And a hole bending portion which is bent so as to sink the outer peripheral portions of the plurality of holes from the surface opposite to the frequency power generation magnet setting surface toward the setting surface side, and the flange portion has A rotating drive device for a disk, wherein a resin magnet is integrally molded to form a magnet for a frequency generator, and the resin magnet is provided with a rotor frame filled and fixed in a hole bent portion of the flange portion. Rotor device. 2. A rotary drive device for mounting and rotating a magnetic disk having a metal disk hub at a central portion thereof, wherein the shaft engages a shaft engaging hole provided at a substantially central portion of the disk hub. A rotor frame that rotates integrally with the shaft, a hub magnet having a magnetic pole portion magnetized to attract the disk hub on a top surface portion of the rotor frame, and a frequency generator having a flange portion integrated with the rotor frame. With a magnet,
The flange portion has a plurality of holes formed by a pressing process, and a hole formed by bending an outer peripheral portion of the plurality of holes from the surface opposite to the frequency power generation magnet setting surface toward the setting surface side. A plurality of holes provided on the top surface of the rotor frame at the position of the hub magnet, and setting the outer peripheral portions of the plurality of holes from a surface opposite to the hub magnet setting surface. A hole-bending portion bent so as to sink into the surface side, and integrally forming a resin magnet on the flange portion and the top surface portion to form a magnet for a frequency generator and a hub magnet, respectively. A rotor device for a rotary drive device for a disk, comprising: a rotor frame in which a magnet is filled and fixed in a hole in the flange portion, a hole bending portion, a hole in the top surface portion, and a hole bending portion. 3. A rotary drive device for a disk, wherein a flange frame and a magnet for a frequency generator are provided on an outer peripheral portion of the rotor frame separately from the rotor frame, and the flange frame has an outer peripheral portion of a hanging portion of the rotor frame. A cylindrical covering part to cover and a flange part perpendicular to the hanging part,
The flange portion is formed of a metal plate having a plurality of holes, and the outer peripheral portions of the plurality of holes are sunk from the surface opposite to the frequency power generation magnet setting surface to the setting surface side. A hole bending section which is bent so as to be bent, and a resin magnet is integrally formed with the flange frame to form a magnet for a frequency generator, and the resin magnet has a hole and a hole bending section formed in the flange frame. A rotor device for a rotary drive of a disk, wherein a flange frame filled in the rotor is fixed to an outer peripheral portion of the rotor frame. 4. A magnetic disk having a metal disk hub at a central portion thereof is mounted on a spindle hub portion of the rotor frame provided with a flange frame separate from the rotor frame and a magnet for a frequency generator on an outer peripheral portion of the rotor frame. In a disk rotation drive device that rotates and drives
A resin magnet is integrally formed on the flange frame to form a frequency generator magnet, and a cylindrical cover portion of the flange frame that covers an outer peripheral portion of a hanging portion of the rotor frame is provided on the frequency power generation magnet side, A rotor device for a rotary drive of a disk, wherein a rotor frame and a flange frame are present between a magnet and a drive magnet. 5. A rotating drive apparatus for a disk having a magnet for a frequency generator provided on a flange portion integral with a rotor frame provided substantially at right angles to a shaft on an outer peripheral portion of a rotor frame. A plurality of holes processed on the surface opposite to the magnet setting surface, and the outer peripheral portions of the plurality of holes are sunk into the setting surface side from the surface opposite to the frequency power generation magnet setting surface. And a stepped portion protruding on the outer peripheral end surface of the flange portion so as to protrude toward the frequency generator magnet setting surface side, and a resin magnet is integrated with the flange portion. The magnet for frequency generator is formed by molding, and the resin magnet is formed so as to fill a plurality of holes provided in the flange portion and to sandwich the projecting stepped portion. A rotor device for a rotary drive of a disk, comprising a fixed rotor frame. 6. A rotary drive apparatus for a disk having a frequency generator magnet provided on a flange portion provided substantially at right angles to a shaft on an outer peripheral portion of a rotor frame, wherein the flange portion has a plurality of holes; Has a chamfered portion on the side opposite to the frequency generator magnet setting surface on the outer peripheral portion, and in the pressing process of the chamfered portion, the frequency generator magnet setting surface side of the rotor frame is more than the setting surface. A rotor device for a rotary drive device for a disk, wherein a part of a frame is taken out, and a plurality of holes are integrally formed so that a magnet for a frequency generator is formed integrally with a rotor frame so as to prevent peeling. 7. A magnet for a frequency generator, which is integrally fixed to the rotor frame by providing a plurality of holes in a flange portion provided substantially at right angles to the shaft on an outer peripheral portion of the rotor frame to prevent peeling of the integral molding. A rotor device for a rotary drive device for a disk, comprising: a disk drive; and an outer peripheral end face of the flange portion is cut out, and the cutout is provided with a gate opening for magnet molding. 8. A frequency generator magnet fixed integrally to a rotor frame by providing a plurality of holes on an outer peripheral portion of the rotor frame at a flange portion provided substantially at right angles to the shaft to prevent peeling during integral molding. In the rotating drive device for a disk provided, a notch is provided on an outer peripheral end surface of the flange portion, and the notch portion of the flange portion is a stepped portion on which the magnet setting surface side for the frequency generator projects with respect to the opposite surface. Wherein the hole portion and the stepped portion of the flange portion are formed integrally with the cutout portion as a gate port for magnet molding.