JPH05336686A - Stator for inner-rotor motor and its manufacture - Google Patents

Abstract

PURPOSE:To make a work for winding a coil easy by a method wherein a stator is composed of inner and outer annular elements which are provided along a circumferential direction and a number of cores which are provided between the inner and outer annular elements and on which coils are wound. CONSTITUTION:A number of cores 85 are connected radially to the outer circumference of an annular element 82 made of non-magnetic material by utilizing an outsert molding technology. Then coils 84 are wound on the respective cores 85. Then an annular element 83 which is made of magnetic material and extended so as to surround the annular element 82 is connected to the tips of the cores 85. With this constitution, the coils 84 can be wound on the cores 85 from the side where the spaces between the two adjacent cores 85 and 85 are wider, so that a coil winding work can be simplified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator for an inner rotor motor suitable for use as a disk rotating motor in a floppy disk device or the like, and a method for manufacturing the same.

[0002]

2. Description of the Related Art Disk devices such as floppy disk devices are widely used in office computers, word processors, etc., including personal computers, and their spread is remarkable.

Conventionally, this type of disk device is constructed, for example, as shown in FIG.

This will be described with reference to FIG. 1. In FIG. 1, reference numeral 1 is a chassis having a spindle center 2 as the center of disk rotation, for example, in an equipment casing (not shown) of a personal computer or the like. And is formed of a bottomed box having a storage space 1a that is opened to the front and that faces the disk cartridge 3. On the rear right side of the bottom surface of the chassis 1, a holding wall 4 having a through hole 4a opening in the front-rear direction and a support shaft 5 juxtaposed with the holding wall 4 at a predetermined interval are erected. Two spring engaging pieces 6 are juxtaposed on each of the springs 6a and 6b arranged in parallel in the left-right direction at a predetermined interval. Further, on both side walls of the chassis 1, there are integrally provided guide grooves 7 (only two left guide grooves are shown) extending vertically.

Reference numerals 8 and 9 denote two pairs of protrusions arranged in parallel in the front-rear direction at a predetermined interval, which are attached to the bottom surface of the chassis 1 and configured to guide a slide plate described later in the front-rear direction. There is. These pairs of stems 8 and 9
Are juxtaposed with each other at a predetermined interval in the left-right direction. Of these, the rear protrusion 9 has a conical cartridge positioning portion 9a whose outer diameter decreases toward the tip.
Is provided.

Reference numeral 10 designates a U-shaped slide plate in cross section, which has an eject button 11 for ejecting a disk cartridge on the right side of the front edge thereof, and has a U-shaped notch 12a in plan view facing the spindle center 2 and the spring. The chassis 1 comprises a bottom plate 12 having a first elongated hole 12b facing the locking piece 6 and two side plates 13 standing on both sides of the bottom plate 12 and facing each other with a predetermined gap.
It is provided so that it can move back and forth.

On the bottom plate 12 of the slide plate 10, a spring engaging member corresponding to the notch 14 and the second elongated hole 15 and the spring engaging piece 6 which both the protrusions 8 and 9 face and extend in the front-rear direction. A stop hole 16 is provided. Further, a lock claw 17 protruding downward is attached to the rear end edge of the bottom plate 14 of the slide plate 10.

On the other hand, the side plate 13 of the slide plate 10 is formed with four front, rear, left and right cam grooves 18 having a slope that rises diagonally forward, and behind the cam grooves 18 is extended in the front-rear direction. An existing rack 19 is provided.

Reference numeral 20 denotes two tension coil springs for urging the slide plate 10 forward. Both ends of the coil springs are engaged with the spring retaining pieces 6 and the spring retaining holes 16, respectively.

Reference numeral 21 denotes a trigger arm having an engaging surface 21a corresponding to the lock claw 17 and a guide surface 21b, which is rotatably provided on the support shaft 5 and has a spring protruding laterally on the upper end surface. An arm operator 22 having a locking protrusion 22a is integrally provided.

Reference numeral 23 is a torsion spring that urges the trigger arm 21 to rotate in a direction in which the slide plate 10 is locked. A winding portion is provided around the support shaft 5, and both ends thereof are the protrusions. 22a and the holding wall 4 are engaged.

A stepping motor 24 for feeding the head carriage is fixed to the rear end of the chassis 1. The output shaft 25 of the stepping motor 24 is formed by a lead screw rod that has a spiral V-shaped groove 25a and extends in the front-rear direction, and a tip portion of the output shaft 25 has a bearing (not shown) in the through hole 4a. Is supported through.

Reference numeral 26 denotes a guide rod extending in the front-rear direction, which is held at the rear center of the chassis 1 and is configured to guide the head carriage described later in the front-rear direction.

27 is a needle pin 2 projecting obliquely rearward
8 and a head carriage having a leaf spring 29 that presses the needle pin 28 into the V-shaped groove 25a of the output shaft 25. The head carriage is inserted into the guide rod 26 so as to be movable back and forth and is provided above the chassis 1. There is. A first head 30 for reading recorded information on a disc is held at the tip of the head carriage 27, and a head arm 32 having a second head 31 corresponding to the first head 30 at the rear upper end. Is swingably attached via an elastic body 33. The head arm 32 is rotationally biased by a torsion spring 34 in a direction in which the second head 31 approaches the first head 30,
A stopper 32a for laterally projecting the arm rotation is integrally provided on one side edge.

Reference numeral 36 denotes a cartridge holder which holds the disc cartridge 3 so that the disc cartridge 3 can be inserted and removed freely, and is provided in the slide plate 10 so as to be vertically movable. Rollers 37, which are convex portions facing the cam grooves 18 and the guide grooves 7, are rotatably held at both side ends of the cartridge holder 36, and the upper end portion is opened at both side edges at one side edge. A cut-and-raised piece 38 having a locking hole 38a is provided. The cartridge holder 36 is
The lock claw 17 and the engaging surface 21a due to the pressing of the disk cartridge 3 against the arm operator 22.
When the slide plate 10 moves forward due to the disengagement of the button, the slide plate 10 approaches the bottom plate 12, while the eject button 1
When the lock claw 17 and the engagement surface 21a are engaged with each other by the backward movement of the slide plate 10 due to the pressing of 1, the bottom plate 12 is separated.

Reference numeral 39 denotes an arm for opening and closing the shutter 3a of the disc cartridge 3, which is rotatably provided at the rear side edge of the upper end portion of the holder 36. A locking piece 40 protruding upward is integrally formed with the arm 39.

Numeral 41 is a coil spring for tensioning which gives the arm 39 a habit of returning, and both ends thereof are the locking pieces 4.
0 and is locked in the locking hole 38a.

Reference numerals 42 and 43 denote types of the disk D (2D
D, 2HD, 2ED) switch and disk D
Is a switch for detecting whether or not writing is possible, and is installed on the chassis 1 via a substrate 44.

Reference numeral 45 denotes a reduction gear mechanism having a gear 46 that meshes with the rack 19 and is installed on the side edge of the rear end portion of the chassis 1.

Reference numerals 47 and 48 in the figure are positioning recesses provided in the case 3b of the disk cartridge 3 into and out of which the protrusions 9 are inserted and withdrawn.

By the way, in order to comply with the recent trend toward thinning, a disk device of this type is equipped with an inner rotor motor as shown in FIGS. 4A and 4B as a disk rotating motor. Has been done.

This is a stator 64 having an annular yoke 61 extending in the circumferential direction, a large number of cores 63 radially provided on the inner peripheral surface of the yoke 61, and around which a coil 62 is wound, and the stator 64. And a rotor 66 having an annular magnet 65 that is rotatably provided on the inner periphery of 64 and faces the core 63.

Further, reference numeral 68 in the drawing denotes a circuit board on which a retainer 70 having a bearing 69 built therein is mounted, and 71 denotes a retainer 69 on the circuit board 68, which is rotatably supported by a bearing 69 in the vertical direction. It is a rotating shaft for fixing the rotor, which has an axis extending to.

The rotor 66 of the inner rotor motor functions as a turntable having a disk chucking magnet (not shown) and a disk chucking rotating lever (not shown).

[0025]

However, in the stator for the inner rotor motor of this type, the yoke 61 is used.
Since the core 63 and the core 63 are integrally formed, it is necessary to wind the coil 62 from the narrow side between the two cores 63 and 63 adjacent to each other. As a result, there is a problem that the winding work of the coil 62 becomes difficult and the productivity in manufacturing the stator is reduced.

The present invention has been made in view of such circumstances, and a stator for an inner rotor motor and a stator for the inner rotor motor, which can easily carry out a winding operation of a coil and can thereby enhance productivity in manufacturing the stator. A manufacturing method is provided.

[0027]

An inner rotor motor stator according to the present invention is a stator provided around the outer periphery of a rotor and having a coil. The stator has inner and outer portions extending in a circumferential direction. It is composed of two annular bodies and a large number of cores which are radially interposed between the two annular bodies and are formed by winding a coil. The outer annular body of the two annular bodies of the stator is formed of a magnetic material. The inner ring is made of a non-magnetic material.

In a method of manufacturing a stator for an inner rotor motor according to another invention of the present invention, a large number of cores are radially connected to the outer peripheral portion of a first annular body made of a non-magnetic material, and then coils are attached to each of these cores. The second annular body made of a magnetic material that is wound and then extends around the outer periphery of the first annular body is connected to the tip of the core.

[0029]

In the present invention, the core can be held by the inner ring before connecting each core to the outer ring of the inner and outer ring bodies.

[0030]

Embodiments of the present invention will be described in detail below with reference to embodiments shown in the drawings.

FIG. 1 is a plan view showing an example in which a stator for an inner rotor motor according to the present invention is used in a spindle motor for a disk device. In the drawings and subsequent figures, the same or equivalent members as in FIG. The detailed description is omitted. In this embodiment, the same or equivalent members as those used in the description of the conventional example are designated by the same reference numerals.

In the figure, the reference numeral 81 designates a stator (stator) for the inner rotor motor, which has two inner and outer annular bodies 82 and 83 extending in the circumferential direction and a space between these annular bodies 82 and 83. A large number of cores 8 which are radially interposed between the coils 8 and have a coil 84 wound around the outer periphery thereof and which are substantially I-shaped in a plan view.
5 and is mounted on the circuit board 68.

Outer annular body 83 of both annular bodies 82 and 83 of stator 81 is formed by a yoke made of a magnetic material, and inner annular body 82 is formed by a holder made of a non-magnetic material (synthetic resin). Has been done.

On the other hand, the inner end surface of the core 85 of the stator 81 is formed as an arcuate surface facing the outer peripheral surface of the rotor 66 (magnet), and the outer end surface is an arcuate surface contacting the inner peripheral surface of the annular body 83. Is formed by.

Next, a method of manufacturing a stator for an inner rotor motor in this embodiment (another invention of the present invention) will be described with reference to FIGS. 2 (A) to 2 (C).

First, as shown in FIG. 9A, a large number of cores 85 are radially connected to the outer peripheral portion of the annular body 82 made of a non-magnetic material by using the outsert molding technique. Then, the coil 84 is wound around each core 85 as shown in FIG. Then, as shown in FIG.
The ring-shaped body 83 made of a magnetic material and extending around
Connect to the tip of 5.

In this way, the stator for the inner rotor motor in this embodiment can be manufactured.

Therefore, in this embodiment, each core 85 is attached to the outer annular body 83 of the inner and outer annular bodies 82 and 83.
Since they can be held by the inner annular body 82 before they are connected to each other, the coil 84 can be wound from the side where the two cores 85, 85 adjacent to each other are wide, and the coil winding work can be simplified. Can be planned.

In the present embodiment, the example applied to the disk device is shown, but the present invention is not limited to this, and can be applied to other electronic devices as in the embodiment. ..

In addition, the present invention is not limited to the above-described embodiments, but various effective modifications and changes can be made based on the technical idea of the present invention.

[0041]

As described above, according to the present invention, there is provided a stator having a coil provided on the outer periphery of the rotor, and the stator has two annular bodies extending in the circumferential direction. And a large number of cores formed by winding a coil radially between the two annular bodies, the outer annular body of the two annular bodies of the stator being formed of a magnetic material, and the inner annular body. Since the body is formed of a non-magnetic material, a method for manufacturing a stator for an inner rotor motor according to another invention of the present invention is a method in which a large number of cores are radially arranged on an outer peripheral portion of a first annular body made of a non-magnetic material. Then, the coil is wound around each of these cores, and then the second annular body made of a magnetic material extending to the outer periphery of the first annular body is connected to the tip of the core. Inside before connecting each core to the outer annulus It can be held by the annular body.

Therefore, the coil can be wound from the side between the two cores adjacent to each other from the wide side, so that the coil winding work can be simplified and the productivity in manufacturing the stator can be improved. it can.

[Brief description of drawings]

FIG. 1 is a plan view showing an example in which a stator for an inner rotor motor according to the present invention is used in a spindle motor for a disk device.

2A to 2C are plan views shown for explaining a method of manufacturing a stator for an inner rotor motor according to another invention of the present invention.

FIG. 3 is an exploded perspective view showing a disc device.

4A and 4B are a plan view and a sectional view showing a conventional stator for an inner rotor motor.

[Explanation of symbols]

 66 ... Rotor 81 ... Stator 82, 83 ... Annular body 84 ... Coil 85 ... Core

Claims (2)

[Claims] 1. A stator having a coil provided on the outer periphery of a rotor, the stator including two inner and outer annular bodies extending in a circumferential direction, and a radially interposed portion between the two annular bodies. And a plurality of cores formed by winding the coil, the outer annular body of the two annular bodies of the stator is made of a magnetic material, and the inner annular body is made of a non-magnetic material. An inner rotor motor stator characterized by the following. 2. A plurality of cores are radially connected to an outer peripheral portion of a first annular body made of a non-magnetic material, and then a coil is wound around each of these cores, and then the outer periphery of the first annular body is extended. A method for manufacturing a stator for an inner rotor motor, characterized in that a second annular body made of a magnetic material is connected to the tip of the core.