JPH0698515A - Motor for disk drive - Google Patents

Abstract

PURPOSE:To realize improvement in efficiency and assembly in addition to miniaturization regarding a radial gap type motor for a disc drive. CONSTITUTION:Cores 33 and windings 34 constituting a stator section 31 are installed so that each axis 17 and 20 is made to run parallel with the axis of rotation 11. The cores 33 are separated into first core members 35 constituting the core sections of the windings 34 and second core members 36 facing a rotor section 32. The second core members 36 are wonted onto the upper ends 37 of the first core members 3 under the state, in which the positions of the members 36 are adjusted, thus constituting a motor for turning a disk.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk rotating motor incorporated in a disk file device.

Currently, most discs have a diameter of 3.5 inches, but in the future, there will be a tendency to reduce the disc diameter to 2.5 inches or even 1.8 inches to make the disc file device small and thin. It is in.

As the size of the disc becomes smaller, the center hole diameter of the disc also becomes smaller (for a 1.8 inch disc,
The central hole diameter is 12 mm), and a disk rotation motor using a brushless motor is required to be small and thin.

In general, efficiency (conversion rate) becomes a problem when miniaturized. Therefore, it is desirable that the disk rotation motor has a structure capable of achieving as high efficiency as possible.

[0005]

2. Description of the Related Art The applicant of the present invention is
The application was filed under Japanese Patent Application No. 4-220379, entitled "motor for disk rotation". This motor is intended for miniaturization.

18 and 19 show the disk rotating motor 1.

The motor 1 is a radial gap type, an outer ring rotating type, and an inner rotor type.

The motor 1 includes a rotor portion 2 and a stator portion 3
And consists of.

The rotor portion 2 comprises an annular permanent magnet 4 and a hub 5 which are radially magnetized in the circumferential direction.

The hub 5 is supported by a fixed shaft 7 on the inner peripheral side by bearings 6, and a disk 8 is fixed on the outer peripheral side.

The annular permanent magnet 4 is fixed to the inner peripheral side surface 10 of the annular recess 9 of the hub 5.

The rotor portion 2 rotates about a rotation axis 11.

As shown in FIG. 20, the stator portion 3 includes an iron core assembly 12, windings 13, and a stator yoke 1.
4 and up.

The iron core assembly 12 has a ring portion 16 made of synthetic resin in a state where nine iron cores 15 are arranged at equal intervals in the circumferential direction.
The structure is fixed by and has a substantially cylindrical shape.

As shown in FIG. 21, the iron core 15 has a shape having a head portion 15a, a neck portion 15b thinner than this, and a leg portion 15c thinner than this along a straight axis line 17.

The above-mentioned ring portion 16 is one of the cores 15
The neck portion 15a is fixed.

The iron core assembly 12 is fixed by engaging the leg portions 15c with the holes 18 of the stator yoke 14.

The winding 13 is fitted on the neck portion 15b. Two
0 is the axis of the winding 13.

The inner side surface 15a-1 of the head portion 15a faces the outer peripheral surface of the annular permanent magnet 4.

In the motor 1 having the above structure, the axis 17 of the iron core piece 15 is parallel to the rotation axis 11.

The axis 20 of the winding 13 is the axis of rotation 11
Be parallel to. As a result, the diameter D ₁ is as small as 12 mmφ.

Further, in the motor 1 having the above structure, as shown in FIG. 20, a winding assembly 22 in which nine windings 13 are annularly arranged and fixed on a flexible printed circuit board 21 is fitted in a hole 18. The iron core assembly 12 is put down on the stator yoke 14 and its neck portion 15b is attached to the hole 13 of the winding wire 13.
It is manufactured by fitting it to a, fitting the leg 15c into the hole 18, centering the iron core assembly 12 appropriately so that torque unevenness does not occur, and fixing it in that position.

[0023]

In order to enable the above centering, as shown in FIG. 22, the dimensions A and B of the hole 13a of the winding 13 are the dimensions C and D of the neck portion 15b of the iron core 15. It is slightly larger. Reference numeral 23 is a gap.

The outer dimension E of the winding 13 is determined by the arrangement of the windings 13 closely arranged in the circumferential direction as shown in FIG.

Therefore, looking at the winding 13, the hole 1
The number of turns is reduced by increasing 3a.

As a result, the motor 1 has a low efficiency due to the small number of turns.

Therefore, it is an object of the present invention to provide a disk rotating motor which has improved efficiency.

[0028]

As shown in FIGS. 1 and 2, a disk rotating motor 30 includes a stator portion 31 and
The rotor portion 32 rotates about the rotation axis 11 with respect to the stator portion 31 to integrally rotate the disk 8.

The rotor portion 32 is multi-pole magnetized in the circumferential direction, and has an annular permanent magnet 4 for generating magnetic flux substantially radially.

The stator part 31 has an iron core axis 17
A plurality of iron cores 33 arranged in parallel with the rotation axis 11 and arranged in an annular shape, windings 34 having winding axis lines 20 provided in each of the iron cores 33 in parallel with the rotation axis 11, and the iron cores. It is configured by the stator yoke 14 connecting the 33 to each other.

Each of the iron cores 33 is a member separate from the first iron core member 35 constituting the core of the winding 34, and is a member separate from the first iron core member 35 so as to face the annular permanent magnet 4. The second core member 36 is connected to the upper end 37 of the first core member 35, and is provided.

[0032]

In the configuration in which the second iron core member 36 is a member different from the first iron core member 35, the centering adjustment is performed by moving only the second iron core member 36 without moving the first iron core member 35. Acts as realized by.

The fact that the first iron core member 35 does not have to move is that the winding 35 and the first iron core member 35 are not moved.
It acts so as to eliminate the gap shown in.

[0034]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 3, 4 and 5 show a disk rotating motor 30A according to a first embodiment of the present invention.

In each figure, FIG. 1 and FIG. 2 and FIG. 18 to FIG.
The same reference numerals are given to the parts corresponding to the components shown in 0.

The motor 30A comprises a rotor portion 32 and a stator portion 31A.

The rotor portion 32 has the same structure as that shown in FIGS.

The stator section 31A will be described below.

The winding 40 is composed of a cylindrical first core member 3
It is formed by winding the flexible printed circuit board (FP) together with the first iron core member 35 forming the core.
C) It is fixed on 41 in a row. This constitutes the winding / core assembly 42. Winding / iron core assembly 4
2 is mounted and fixed on a chassis base 43 as a stator yoke with the fixed shaft 7 as the center.

As enlarged and shown in FIG. 6, there is no gap between the inner circumference of the winding 40 and the peripheral surface of the first iron core member 35.
This is because, as will be described later, centering adjustment is not performed on the first iron core member 35. Because there are no gaps,
The winding 40 is also wound around the gap 23 shown in FIG. 18, and the number of turns is greater than in the conventional case.

The first iron core member 35 has a cross-sectional area as small as possible within the range where it is not saturated, and the diameter d is set as small as possible. This also enables the winding 40
Has a large number of turns, and when compared with the same number of turns, the electric resistance becomes low.

As shown in FIGS. 7A and 7B,
The winding end 40a is soldered to the terminal 44 near the FPC 41, and the winding start 40b is pulled out from the inner diameter of the winding 40 to the outside and soldered to the terminal 45.

Further, the lower ends 4 of all the first iron core members 35 are
6 is connected to the starter yoke 43 as shown in FIGS. 5 and 7B. Thereby, the first iron core member 3
5 are connected to each other by a starter yoke 43.

As shown in FIGS. 3 and 4, the second iron core member 36 has a substantially rectangular shape, and is a member separate from the first iron core member 37.

The second iron core members 36 are arranged in an annular shape and are integrated on the outer peripheral side by a synthetic resin ring portion 47 to form an annular second iron core member assembly 48. There is.

The material of the ring portion 47 is P containing glass fiber.
It is PS (polyphenylene sulfite). This is because of high rigidity and high dimensional accuracy.

Further, since the second iron core member 36 has a substantially rectangular shape and does not have a protruding portion, the ring portion 47 can be molded more easily and more accurately than the ring portion 16 shown in FIG. .

This second core member assembly 48 is
It is placed on the iron core assembly 42, is in phase with the first iron core member 35, and is centering-adjusted with respect to the fixed shaft 7, and is bonded to the winding / iron core assembly 42.

For the centering adjustment, an appropriate jig is used to adjust only the second iron core assembly 48 as shown in FIGS.
In the middle, it is performed by appropriately moving as indicated by an arrow 49.

Since the winding / iron core assembly 42 is not moved, the winding 34 is wound around the first iron core member 35 without a gap as shown in FIG. 6, and the number of turns is equal to that of the conventional one. Just a lot.

The lower surface 36a of each second iron core member 36
Is connected to the upper end 37 of the first iron core member 35,
When a current flows through the winding 34, a magnetic pole is formed in the second iron core member 36 according to the direction of the current, and a rotational force is generated in the annular permanent magnet 4.

Also, the inner side surface 3 of each second iron core member 36.
6b faces the outer peripheral surface of the annular permanent magnet 4.

According to the motor 30A having the above structure, the winding 3
Since the number of turns of 4 is larger than the conventional one, the efficiency is higher than the conventional one.

In addition, the motor 30A having the above-mentioned structure has
The iron core assembly 42 is fixed on the chassis base 43, and then the second iron core member assembly 48 is attached to the winding / iron core assembly 42.
It is assembled by adjusting the centering on and fixing it.

For this reason, the assembly precision of the winding / iron core assembly 42 itself and the chassis base 43 of the winding / iron core assembly 42.
The accuracy of attachment to the surface may be rough, and the assembly work at this stage is easy.

The first iron core and the second iron core are joined together by means such as adhesion, electric welding, or when both are resin-molded, heat fusion of the resin or the like. Similarly, the winding / iron core assembly can be fixed to the chassis base by adhesion or spot welding, in addition to the method of press-fitting into the chassis base shown in the conventional example.

Next, a modified example of the winding will be described.

8A and 8B show the first core member 3
5 is fixed on the terminal 50 of the FPC 41 to serve as an electrode, and the winding start end 40b-1 of the winding 40 is connected to the central first iron core member 35.

According to this structure, it is possible to eliminate the lead-out end 40b shown in FIG. 7 to the outside (which makes the outer diameter of the winding large) and increase the number of turns accordingly. Become.

The first iron core member 35 and the chassis base 43
A part of the FPC 41 is interposed between and.

Further, in FIG. 9, the first iron core member 35A is constructed to have the collars 35Aa and 35Ab, and the winding 40
Is formed.

The presence of the collars 35Aa and 35Ab allows the winding 40 to be stably formed.

Next, a modification of the winding / iron core assembly will be described.

FIG. 10 shows a first modification.

In this winding / iron core assembly 42A, the winding 40 wound around the first iron core member 35 is arranged in an annular shape.
It is a disc-shaped structure made of synthetic resin.

Reference numeral 60 is a disk portion made of synthetic resin.

The upper end 37 and the lower end (not shown) of the first iron core member 35 are exposed.

This assembly 42A is easy to handle when assembling the motor.

11A and 11B show a second modification.

The winding / iron core assembly 42B uses a first iron core member assembly part 70 in which a plurality of first iron core members 35B are formed to project from an annular yoke 71.

A winding 40 is wound around each first iron core member 35A.

According to this structure, the first iron core member 35A
And the positional accuracy of the winding 40 is high.

The chassis base does not have to be magnetic.

FIG. 12 shows a winding / core assembly 42C according to a third modification.

The winding 40A is formed by winding a narrow strip-shaped copper foil having an insulating film.

Reference numeral 80 denotes a synthetic resin ring portion which fixes the winding 40A together with the first iron core member 35.

This winding / core assembly 42C is manufactured as shown in FIG.

First, as shown in FIG. 9A, a copper foil 91 having an insulating film formed thereon is wound around a magnetic rod 90 coated with an insulating paint to form a copper foil winding body 92.

Next, as shown in FIG. 9B, nine copper foil winding bodies 92 are lined up in the circumferential direction and integrated with a synthetic resin to obtain a copper foil winding body assembly 93. . 94 is a cylindrical portion made of synthetic resin.

Next, this assembly 93 is cut along the chain double-dashed line to a predetermined thickness t, and the cylindrical portion 94 and the copper foil winding body 92 are cut.
The winding / iron core assembly 42C is obtained by cutting the magnetic rod 90 and the magnetic rod 90.

As can be seen from the above, this winding / core assembly 42C can be manufactured with high productivity.

When the iron core is used as the electrode, it is sufficient to insulate only the winding start portion of the copper foil.

The above-mentioned manufacturing method is similar to the manufacturing method of the slice coil of Toshiba Thermal Appliance Co., Ltd. and the lamin coil of Sony Chemical Co., Ltd.

14 and 15 show a winding / core assembly 42D according to a fourth modification.

In this assembly 42D, nine coil patterns 100 are formed on the upper layer side by side in the circumferential direction, and nine coil patterns 101 are formed on the lower layer side by side in the circumferential direction. , Upper and lower corresponding coil pattern 10
0 and 101 are electrically connected by an iron core 102 made of, for example, permendur, which is provided in the entire through hole in the center.

The iron core 102 is formed by plating.
The iron core 102 may be made of permalloy, sendust, iron nitride, or silicon iron. In FIG. 15, 103 is a photoresist layer.

The portion of the iron core 102 shown in FIG.
Alternatively, the structure shown in FIG. 17 may be used.

In FIG. 16, the iron core 102A is provided inside the thin through hole 105 made of copper.

In FIG. 17, the iron core 102B is provided inside the photoresist layer 106 formed on the inner periphery of the thin through hole 105 made of copper. Iron core 102B
Are electrically insulated from the coil patterns 101 and 102.

The winding / iron core assembly is manufactured by Asahi Kasei Corporation.
The fine pattern (FP) coil, the HP coil manufactured by Matsushita Electric Co., Ltd., and the sheet coil manufactured by Kyoshin Denki Kikai Co., Ltd.

The present invention is not limited to the radial gap type outer ring rotating type and inner rotor type, but is also a radial gap type, outer ring rotating type outer rotor type, and radial gap type inner ring rotating type. The same can be applied to an outer rotor type motor.

The winding 40 in FIG. 3 can also be obtained by cutting the copper foil winding body 92 of FIG. 13A along the chain double-dashed line.

[0093]

As described above, according to the first aspect of the invention, the centering adjustment is not necessary for the first core member in the downsized structure. The winding can be formed without providing a gap between the winding and the first iron core member, which can increase the number of turns of the winding as compared with the conventional one, resulting in improvement of motor efficiency. It can be done.

Further, the positional accuracy of the first iron core member can be relaxed as compared with the conventional one, and the assembly of the motor can be simplified accordingly.

According to the second aspect of the present invention, the number of steps for assembling the motor can be reduced and the mounting accuracy can be improved as compared with the structure in which the second iron core members are mounted one by one.

According to the invention of claim 3, the number of steps for assembling the motor can be reduced and the accuracy can be improved as compared with the structure in which the first iron core members are attached one by one.

According to the invention of claim 4, the winding / iron core assembly can be mass-produced with high productivity.

According to the fifth to eighth aspects of the invention, the winding / iron core assembly can be made highly reliable.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing the principle configuration of the present invention.

FIG. 2 is a principle configuration diagram of the present invention.

FIG. 3 is an exploded perspective view of a disk rotating motor according to a first embodiment of the present invention.

FIG. 4 is a perspective view of an essential part of a disk rotating motor according to the first embodiment of the present invention.

FIG. 5 is a sectional view of a disk rotating motor according to a first embodiment of the present invention.

6 is a plan view of one winding in FIG. 3. FIG.

FIG. 7 is a diagram showing a mounting state of a winding and a first iron core member.

FIG. 8 is a diagram showing a first modification of windings.

FIG. 9 is a diagram showing a second modification of the winding.

FIG. 10 is a view showing a first modification of the winding / iron core assembly.

FIG. 11 is a diagram showing a second modification of the winding / iron core assembly.

FIG. 12 is a view showing a third modification of the winding / iron core assembly.

FIG. 13 is a diagram for explaining the manufacture of the winding assembly of FIG.

FIG. 14 is a perspective view showing a fourth modification of the winding / iron core assembly.

15 is an enlarged cross-sectional view taken along the line XV-XV in FIG.

FIG. 16 is a diagram showing a first modification of the iron core portion in FIG. 15.

FIG. 17 is a diagram showing a second modification of the iron core portion in FIG. 15.

FIG. 18 is a perspective view of a disk rotating motor according to the applicant's prior application.

19 is a vertical cross-sectional view of the disc rotating motor of FIG.

20 is an exploded perspective view of a stator portion of the disk rotating motor of FIG.

FIG. 21 is a view showing one iron core piece.

FIG. 22 is a diagram showing a dimensional relationship between a winding and a neck portion which is a core portion thereof.

[Explanation of symbols]

7 Fixed Shaft 8 Magnetic Disk 11 Rotation Axis 17 Axis 20 Winding Axis 30, 30A Disk Rotating Motor 31 Stator Part 32 Rotor Part 33 Iron Core 34, 40, 40A Winding 35, 35A First Iron Core Member 36 Second Iron Core Member 37 Upper end 41 Flexible printed circuit board (FPC) 42, 42A, 42B, 42C, 42D Winding / iron core assembly 43 Chassis base 44, 45, 50 Terminal 46 Lower end 47, 80 Synthetic resin ring part 48 Second iron core Member assembly 49 Arrow indicating centering adjustment 60 Disk part made of synthetic resin 70 First iron core member assembly part 71 Annular yoke 90 Magnetic rod 91 Copper foil 92 Copper foil winding body 93 Copper foil winding body assembly 94 Synthetic resin cylindrical part 100, 101 Coil pattern 102, 102A, 102B Iron core 105 Ruhoru 106 photoresist layer

Claims (8)

[Claims] 1. A stator part (31) and a rotor part (32) for rotating the disc (8) integrally with the stator part by rotating about a rotation axis (11), the rotor part comprising: Has an annular permanent magnet (4) which is multi-pole magnetized in the circumferential direction and generates a magnetic flux substantially radially, and the stator portion has its iron core axis (17) parallel to the rotation axis. A plurality of iron cores (33) arranged in an annular shape, windings (34) having winding axis lines (20) parallel to the rotation axis and provided on each of the iron cores, and a stator for interconnecting the iron cores. A disk rotating motor having a yoke (14), wherein each of the iron cores includes a first iron core member (35) forming a core portion of the winding (34), and the first iron core. It is a member separate from the member and faces the annular permanent magnet (4). And a second iron core member (36) arranged in such a manner that the second iron core member (36) is connected to the upper end (37) of the first iron core member. A disk rotation motor. 2. A plurality of second core members (3) according to claim 1.
6) is a synthetic resin ring portion (4
7) A disk rotating motor having a configuration in which an annular second iron core member assembly (48) integrated by 7) is configured. 3. The first iron core member (35) according to claim 1,
A winding / iron core assembly (42, 42A, 42B, 42) that is fixed side by side in an annular shape together with a winding (40) wound around this
A disk rotation motor having the configuration of C). 4. The winding / iron core assembly (42C) according to claim 3.
Is a magnetic rod (90) with a copper foil (9
1) is wound to produce a copper foil wound body (92), and the copper foil wound body is integrated by a synthetic resin columnar portion (94) in a state where the copper foil wound bodies are arranged in a plurality of circumferential directions, and the copper foil wound body is formed. Assembly (9
3) A disk rotating motor, which is manufactured by manufacturing 3) and cutting the copper foil winding assembly (93) into a predetermined thickness (t). 5. The winding / iron core assembly according to claim 3, wherein a plurality of coil patterns are formed on a plurality of planes laminated in the thickness direction by a photographic method, and a central portion of the plurality of plane coil patterns is formed. 1. A disk rotating motor having a through-hole for electrically connecting upper and lower patterns, wherein the through-hole is filled with a soft magnetic material. 6. Any one of claims 1 to 5
The first iron core member of the above item is electrically connected to the winding, and the motor for rotating a disk. 7. A disk rotating motor according to claim 1, wherein the first iron core member and the second iron core member are bonded together by adhesion, welding, or heat fusion of a mold resin. 8. A disk rotating motor according to claim 1, wherein the first iron core member and the stator yoke are connected by adhesion, welding, or press fitting.