JPH06335218A - Spindle motor for driving magnetic disk - Google Patents

Abstract

PURPOSE:To perform rationalization, save man-power, and reduce cost by automating motor coil winding operation. CONSTITUTION:A pin-shaped retention terminal 19 made of plastic resin is provided on one surface of a stator core 9, thus positioning the beginning and ending wires of the coil winding of the spindle motor for driving a magnetic disk. It is bent radially into a slot 18 to be made abut on a land for soldering and hence automating coil winding operation and rationalizing the coil winding operation and saving man-power.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DC brushless spindle motor (hereinafter also simply referred to as a spindle motor) for driving a magnetic disk, which is suitable for use in a relatively small magnetic disk device, and in particular, an improvement of a holding terminal for winding thereof. Regarding

[0002]

2. Description of the Related Art FIG. 16 is a sectional view showing a conventional example of this kind of spindle motor. That is, in the hub 2 on which the magnetic disk 1 is mounted, the rotor 3 integrally formed therewith secures an insertion space 4 for a magnetic head (not shown),
It is provided below the magnetic disk 1. Also, hub 2
The rotor 3 is rotatably supported by the bearing 5 and fixed to the housing 6. On the other hand, the coil 8 is provided on the outer peripheral surface 7a of the cylindrical portion 7 of the housing 6 in which the bearing 5 is inserted.
The inner diameter surface 17 of the stator core 9 wound with is bonded or press-fitted, and is fixed coaxially with the hub 2 and the rotor 3.

On the other hand, a permanent magnet 10 is disposed coaxially with the outer peripheral surface of the stator core 9 facing the outer peripheral surface of the stator core 9 and is coaxially fixed to the rotor 3 by a method such as bonding. It should be noted that unillustrated winding start and winding ends of the coil 8 are electrically connected to a flexible printed board (hereinafter also referred to as FPC) 12 provided below the coil 8 coaxially and in parallel with the stator core 9, Further, the magnetic disk 1 is coaxially and integrally attached to the hub 2 with a fixing member 13. In such a structure, the rotor 3 is generated between the stator core 9 and the permanent magnet 10 by controlling the current flow through the coil 8 in a predetermined order from the drive circuit (not shown) through the FPC 12. It rotates in one direction by electromagnetic force.

FIG. 17 is a top view showing the relationship between the stator core and windings of FIG. 16, and FIG. 18 is a sectional view taken along the line AA of FIG. As shown in these drawings, coils 8a to 8i are wound around the nine teeth 14a to 14i of the stator core 9, and each coil is a coil 8a → a coil 8d → a coil 8g,
Coil 8b → coil 8e → coil 8h, and coil 8
When the rotor 3 (not shown here) is externally rotated, as in the case of c → coil 8f → coil 8i, the voltages are generated in the respective coils and are connected in series. Also, the winding start line 1 of the coils 8a, 8b, 8c
1a, 11b, and 11c are soldered to the lands 15a, 15b, and 15c of the FPC 12, respectively, and the winding end lines 11g, 11h, and 1 of the coils 8g, 8h, and 8i.
1i is soldered to the lands 15g, 15h, and 15i. The lands 15g, 15h, and 15i are FPCs.
12 are electrically connected to each other inside the coil 8
The electrical connection of is, for example, a three-phase star connection with a neutral point.

Here, the winding starting and ending winding lines 11 (11a to 11c, 11g to 11i) of the coil are connected to the FPC1.
Consider the case of soldering to the second land 15 (15a to 15c, 15g to 15i). Since the winding of the coil 8 is generally a thin copper wire, it is highly flexible. Therefore, the position where the winding start and end 11 of the coil is not fixed mechanically during the winding operation is not fixed. Therefore, the soldering work is complicated and its automation is extremely difficult. That is, the stator core 9 and the FPC 12 around which the coil 8 is wound are fixed in advance to predetermined positions with a jig or the like, and then the winding start / end winding line 11 is grasped by an automatic machine and the predetermined land 15 is formed. The soldering work is carried out by bringing them into contact with each other, but as described above, the position of the line 11 at the beginning and end of winding is indefinite, and therefore the wire cannot be grasped by an automatic machine as it is. For this reason, for example, a means for detecting the position of the winding start line 11 and the winding end line 11 is required with a highly accurate pattern recognition device or the like.

[0006]

However, not only is such a pattern recognition apparatus very large in scale and the equipment cost is enormous, but the position is uncertain even if such an apparatus is used. Since it is difficult to identify a predetermined line from a plurality of lines, there are problems that erroneous detection is likely to occur, moreover, it takes a lot of time before detection, and the soldering work time becomes long. Therefore, an object of the present invention is to enable automation of motor windings, rationalization, labor saving, and cost reduction.

[0007]

In order to solve such a problem, the present invention is provided with a field permanent magnet, and is rotatably supported via a bearing fixed inside a cylinder of a housing to provide a magnetic disk. And a stator core mounted on the outer peripheral portion of the cylinder of the housing, coaxial with the permanent magnet for the field and arranged so as to face each other with a small radial uniform gap. In a spindle motor for driving a magnetic disk, which has a winding wound around and electrically connected to a printed board,
It is characterized by the following (1), (2) or (3).

(1) A pin-shaped holding terminal made of a flexible plastic resin is provided on one surface of the yoke of the stator core and substantially at the center of the slot where the winding start and winding ends are located. During winding, the winding is retracted from the slot to wind the winding, and the slits formed at the tips of the holding terminals sandwich and fix the winding start and winding ends. (2) A pin shape made of a flexible plastic resin is formed on one surface of the yoke of the stator core and at substantially the center position of the slot where the winding start and end lines of the winding are located, in substantially the same direction as the inner diameter surface of the stator core. A holding terminal is provided, the winding start and end wires of the winding are sandwiched in the slit provided at the tip, and the holding terminal is bent into the slot to start winding and the winding end wire on one side of the stator core. , Abut on the land of the printed board provided substantially coaxially and parallel to each other to make solder connection.

(3) On one surface of the yoke of the stator core,
In addition, a pin-shaped holding terminal made of a flexible plastic resin is provided at a substantially central position of the slot where the winding start and winding end lines are located, approximately at a right angle to the stator core inner diameter surface, and outward in the radial direction of the stator core. When winding, wind the winding by bending it in the same direction as the inner diameter surface of the stator core so that it will come out of the slot in which the winding is wound, and when winding, start winding the winding in the slit formed at the tip of the winding, After sandwiching the wire at the end of winding, return the holding terminal to almost the same position as before bending, and start winding of the winding, and the wire at the end of winding on the land of the printed board that is approximately coaxial and parallel to one surface of the stator core. Contact and solder connection.

[0010]

A pin-shaped holding terminal made of a flexible plastic resin is provided to position the winding start and end lines of the winding, and then the pin-shaped holding terminal is bent into the slot, or By returning to the original position and contacting the land for soldering, rationalization of the winding, labor saving and cost reduction are achieved.

[0011]

1 and 2 are schematic views showing a first embodiment of the present invention. FIG. 1 is a top view of a stator core having a pin-shaped holding terminal, and FIG. 2 shows a part of the holding terminal and a yoke of the stator core. FIG. 3 is a perspective view of the device, which is cut out, taken out, and viewed obliquely from above. As shown in FIG. 1, the yoke 16 of the stator core 9 is held substantially in the same direction as the inner diameter surface 17 of the stator core 9 and at the substantially central position of the slot 18 where the winding start and end lines of the coil (not shown) are located. A terminal 19 is provided.
The holding terminal 19 is in the form of a flat pin here, and a block 20 having a slit 21 at the tip thereof for sandwiching the winding start and winding end lines (not shown).
Are provided (see FIG. 2).

The length of the holding terminal 19 is the slot 18
When it is bent inside and brought into contact with an FPC (not shown) provided coaxially and parallel to the stator core 9, the length is set to be slightly shorter than the land position (not shown) of the FPC. On the other hand, the end surfaces 22 and 23 of the yoke 16 and the inner diameter surface 1
7 is provided with a U-shaped ring 24 integrally formed with the holding terminal 19 to fix the holding terminal 19 to the stator core 9.
keeping. A flexible plastic resin is used for the holding terminal 19 and the ring 24, and the holding terminal 19 and the ring 24 are formed by injection molding in a mold (not shown).

With reference to FIG. 3, the manner in which the stator core with holding terminals according to the present invention is mounted on a winding jig and the winding start and winding ends are sandwiched will be described. As shown in FIG. 3, the stator core 9 includes the winding jigs 25, 26.
The holding terminal 19 is abutted on the circumferential surface 27 of the winding jig 25 and faces upward. Here, the winding start will be described. The winding 2 passing through the inside of the needle 28
Reference numeral 9 denotes a carragee pin 30 provided on the winding jig 25 by a needle 28 driven by a winding device (not shown).
Then, it is sandwiched between the slits 21 of the holding terminal 19 and wound around a predetermined tooth 14 of the stator core 9.

At the end of winding, the movement is opposite to that at the beginning of winding,
After the winding 29 is wound around the predetermined tooth 14 to wind the coil 8, it is sandwiched between the slits 21 of the holding terminal 19 and wound around the carragee pin 30. When the winding 29 is sandwiched between the slits 21, when the position of the holding terminal 19 is slightly displaced and the sandwiching work is difficult due to the flexibility of the material of the holding terminal 19, as will be described later, the winding jig 25 A groove (not shown) may be formed on the circumferential surface 27, and the holding terminal 19 may be fitted and positioned to be fixed. After the series of winding work is completed, the winding start and end wires 11 of the winding 29 are cut from the tip of the holding terminal 19 leaving a length necessary for soldering.

FIG. 4 shows the holding terminal shown in FIGS.
FIG. 5 shows a cross-sectional view taken along line BB in FIG. 4 and 5, the stator core 9 around which the coil 8 is wound is positioned and fixed coaxially and in parallel with the FPC 12 by a jig (not shown). In this state,
The holding terminal 19 is bent toward the outside in the radial direction by another jig (not shown), and then inserted into the slot 18 and abutted on the FPC 12. As described above, the length of the holding terminal 19 is slightly shorter than the position of the land 15 of the FPC 12 when the holding terminal 19 is bent.
The winding start and end line 11 from the tip of the
The land 15 comes into contact with the land 15. After that, the winding start and end winding wires 11 and lands 15 are soldered.

By the above, (1) since the holding terminal stands parallel to the inner circumferential surface of the stator core and is removed from the slot portion into which the needle is inserted at the time of winding, it is mounted on the winding jig. In this case, it is not necessary to raise it with a jig and fix it. (2) When pre-soldering the winding start and winding end lines of the holding terminal tip in advance, since the holding terminal is standing, the tip can be immersed in the solder bath as it is. The advantages such as are obtained.

FIGS. 6 and 7 show a second embodiment of the present invention, FIG. 6 is a top view of a stator core having pin-shaped holding terminals, and FIG. 7 is a partial cutout of the holding terminals and the yoke of the stator core. FIG. 3 is a perspective view of the same taken out and viewed from diagonally above. As shown in FIG. 6 and FIG. 7, the yoke 16 of the stator core 9 is substantially at the center of the slot 18 in the direction substantially perpendicular to the inner diameter surface 17 of the stator core 9 and at which the winding start and end lines of the coil (not shown) are located. The holding terminal 19 is provided at the position.

The holding terminal 19 is in the form of a flat plate pin here, and a block 20 having a slit 21 for sandwiching the winding start and winding ends of a coil (not shown) is provided at the tip thereof. In addition, the holding terminal 19
Is set to be slightly shorter than a land position (not shown) of the FPC when the FPC (not shown) provided coaxially and in parallel with the stator core 9 is abutted. On the other hand, on the end faces 22 and 23 and the inner diameter 17 of the yoke 16,
A U-shaped ring 24 formed integrally with the holding terminal 19 is provided to fix and hold the holding terminal 19 to the stator core 9. A flexible plastic resin having an appropriate restoring force is used for the holding terminals 19 and the rings 24, and the holding terminals 19 and the rings 24 are manufactured by injection molding in a mold (not shown).

Referring to FIG. 8, the manner in which the stator core with holding terminals as shown in FIGS. 6 and 7 is mounted on the winding jig and the winding start and end lines are sandwiched will be described. . As shown in FIG. 8, the stator core 9 is supported and fixed by the winding jigs 25 and 26. Holding terminal 19
Is raised by a jig (not shown) so as to come into contact with the circumferential surface 27, and is fitted and fixed in the groove 31 of the circumferential surface 27. At this time, the holding terminal 19 uses the flexibility of its material to make the groove 3
1 so that the winding wire 29 is not removed when sandwiching the winding wire 29 in a slit 20 (not shown here) and is easily removed when it is removed by a jig or the like after the winding work work. 31 dimensional designs are underway. Other than this, the description is omitted because it is similar to the case of FIGS.

FIG. 9 shows the holding terminal shown in FIGS.
10 is a top view in the case of soldering to FIG. In FIGS. 9 and 10, the winding jig 25 is used.
When the holding terminal 19 fitted in the groove 31 is removed from the winding jig 25, it is almost returned to the position before being bent by the restoring force of the material. In this state, the side surface of the stator core having the holding terminal is opposed to the FPC, and the stator core 9 is put into a jig (not shown) into which the FPC 12 has been inserted in advance.
Place coaxially and parallel to 12. Thereby, the holding terminal 19
Contacts the FPC 12. As described above, the holding terminal 19
Is slightly shorter than the position of the land 15 of the FPC 12, and therefore, the winding start and winding end lines 11 extending from the tip of the holding terminal 19 are located in contact with the land 15. . After that, the winding start and end winding wires 11 and lands 15 are soldered.

6 and 7, (1) when the holding terminal is put in a mold and injection-molded, the mold shape can be simplified as compared with FIGS. 1 and 2. The number of molds is small. (2) When the holding terminal is brought into contact with the FPC, a jig for bending the holding terminal is unnecessary. The advantages such as are obtained.

FIG. 11 shows a modified example of the holding terminal. That is, in the first and second embodiments, the block 20 is provided at the tip of the holding terminal 19 and the slit 21 is formed therein. However, here, the block 20 is eliminated and the slit 21 is provided directly at the tip of the holding terminal 19. The coil 11 has a winding start line 11 and a winding end line 11. It is suitable for use when the width W or the thickness t of the holding terminal 19 is made relatively large.

FIG. 12 shows a modification of the stator core, FIG. 13 shows its DD cross section, FIG. 14 shows another modification of the stator core, and FIG. 15 shows its EE cross section. That is, in the first and second embodiments, a U-shaped ring (not shown) integrally formed with the holding terminal 19 is provided on the end surfaces 22 and 23 and the inner diameter surface 17 of the yoke 16, and the holding terminal 19 is attached to the stator core 9. It is fixed and held on the inner diameter surface 17 because of the structure of the motor, for example, dimensional restrictions.
A modified example is shown in which it is not possible to cover with a flexible plastic resin.

That is, in FIG. 12 and FIG. 13, the yoke 16
A plurality of grooves 32 are provided in parallel with the inner diameter surface 17 of the ring 32, and a ring 33 formed integrally with the holding terminal 19 formed on the end surface 22 and a ring 34 formed on the opposite end surface 23 are provided. When molding the holding terminal 19 together with the flexible plastic resin, the groove 32 is also filled with the flexible plastic resin. As a result, the rings 33 and 34 are not
It is possible to fix and hold the holding terminal 19 to the stator core 9 without connecting the flexible plastic resin filled in 2 to the inside of the inner diameter surface 17 of the flexible plastic resin.

14 and 15, instead of the groove 32, a plurality of through holes 35 are formed in the yoke 16 in the same direction as the inner diameter surface 17 to hold the holding terminal 19, the ring 33, and the ring 34.
When is molded with a flexible plastic resin, the holes 35 are also filled with the flexible plastic resin. As a result, as in the case of FIGS. 12 and 13, the rings 33 and 34 have holes 35.
It is possible to fix and hold the holding terminal 19 to the stator core 9 without connecting the flexible plastic resin filled in the inner side of the inner diameter surface 17 with the flexible plastic resin. Although the spindle motor has been mainly described above, the present invention can also be applied to motors similar to this.

[0026]

According to the present invention, the following effects can be expected. (1) Automation of soldering is facilitated, which leads to labor saving and cost reduction. (2) In automation, expensive equipment such as a highly accurate pattern recognition device is unnecessary. (3) Erroneous connection to the FPC is eliminated. (4) Manual soldering is also possible, which simplifies the work and reduces the working time.

[Brief description of drawings]

FIG. 1 is a top view of a stator core having pin-shaped holding terminals according to the present invention.

FIG. 2 is a perspective view showing the holding terminal and a yoke of a stator core in FIG.

FIG. 3 is an explanatory diagram illustrating a method of sandwiching a winding start line and a winding end line in FIG.

FIG. 4 is a top view showing a state where the holding terminals shown in FIGS. 1 and 2 are soldered to an FPC.

5 is a sectional view taken along line BB of FIG.

FIG. 6 is a top view of a stator core having pin-shaped holding terminals according to another embodiment of the present invention.

7 is a perspective view showing a holding terminal and a yoke of a stator core in FIG.

8 is an explanatory diagram illustrating a method of sandwiching a winding start line and a winding end line in FIG.

FIG. 9 is a top view showing a state where the holding terminals shown in FIGS. 7 and 8 are soldered to an FPC.

10 is a cross-sectional view taken along line CC of FIG.

FIG. 11 is a perspective view showing a modified example of the holding terminal.

FIG. 12 is a top view showing a modified example of the stator core.

13 is a cross-sectional view taken along the line DD of FIG.

FIG. 14 is a top view showing another modification of the stator core.

15 is a sectional view taken along line EE of FIG.

FIG. 16 is a sectional view showing a conventional example of this kind of spindle motor.

FIG. 17 is a top view showing the relationship between the stator core and windings of FIG.

18 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

1 ... magnetic disk, 2 ... hub, 3 ... rotor, 4 ... space,
5 ... Bearing, 6 ... Housing, 7 ... Cylindrical part, 7a ... Outer peripheral surface, 8 ... Coil, 9 ... Stator core, 10 ... Permanent magnet,
12 ... Flexible printed circuit board (FPC), 13 ... Fixing metal fitting, 14 ... Teeth, 15 ... Land, 16 ... Yoke,
17 ... Inner diameter surface, 18 ... Slot, 19 ... Holding terminal, 20
... Blocks, 21 ... Slits, 22, 23 ... End faces, 2
4, 33, 34 ... Ring, 25, 26 ... Winding jig, 27
... Circumferential surface, 31, 32 ... Groove, 35 ... Through hole.

Claims (3)

[Claims] 1. A permanent magnet for field use, which is rotatably supported via a bearing fixed inside a cylinder of a housing,
A hub on which a magnetic disk is mounted and a cylindrical outer peripheral portion of the housing are mounted, coaxial with the permanent magnet for field magnet,
In a spindle motor for driving a magnetic disk, which has a stator core arranged to face each other with a uniform radial small gap, and a winding wound around the stator core and electrically connected to a printed board. A pin-shaped holding terminal made of a flexible plastic resin is provided on one surface of the yoke of the stator core and substantially in the center of the slot where the winding start and winding ends are located. A spindle motor for driving a magnetic disk, characterized in that the winding is wound away from the slot and the winding start and end lines are sandwiched and fixed in a slit formed at the tip of the holding terminal. 2. A permanent magnet for field use, which is rotatably supported via a bearing fixed inside a cylinder of a housing,
A hub on which a magnetic disk is mounted and a cylindrical outer peripheral portion of the housing are mounted, coaxial with the permanent magnet for field magnet,
In a spindle motor for driving a magnetic disk, which has a stator core arranged to face each other with a uniform radial small gap, and a winding wound around the stator core and electrically connected to a printed board. , Pin-shaped holding terminal made of flexible plastic resin on one surface of the yoke of the stator core and at approximately the center position of the slot where the winding start and end lines are located in the same direction as the inner diameter surface of the stator core. After inserting the winding start wire and winding end wire in the slit provided at the tip, bend the holding terminal into the slot and start winding of the winding wire, and put the winding end wire on one surface of the stator core. A spindle motor for driving a magnetic disk, which is characterized in that it is brought into contact with a land of a printed board provided coaxially and in parallel to make a solder connection. 3. A permanent magnet for field use, which is rotatably supported via a bearing fixed inside a cylinder of a housing,
A hub on which a magnetic disk is mounted and a cylindrical outer peripheral portion of the housing are mounted, coaxial with the permanent magnet for field magnet,
In a spindle motor for driving a magnetic disk, which has a stator core arranged to face each other with a uniform radial small gap, and a winding wound around the stator core and electrically connected to a printed board. , A flexible plastic resin on one surface on the yoke of the stator core, at substantially the center position of the slot where the winding start and end lines of the winding are located, approximately at right angles to the stator core inner diameter surface, and outward in the radial direction of the stator core. A pin-shaped holding terminal made of is formed.When winding, the winding is wound by bending it in the same direction as the inner diameter surface of the stator core so that it is removed from the slot in which the winding is wound. After sandwiching the winding start and end wires in the slit, return the holding terminal to the same position as before bending and start winding A spindle motor for driving a magnetic disk, characterized in that the wire is brought into contact with a land of a printed board provided substantially coaxially and parallel to one surface of the stator core for solder connection.