JP2005245141A - Spindle motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spindle motor in which an insulation failure between a base and the winding end of a coil led out to the outside of the motor can be controlled completely and the man-hour of assembling work can be reduced by attaching an insulating member easily. <P>SOLUTION: An insulating member 24 is inserted into a hole formed in a base 5, a lead-out hole 25 having one end opening to the stator 4 side and the other end opening to the wiring board 18 side is formed in the insulating member 24, the winding end 19 of a coil 3 is led out from the stator 4 side through the lead-out hole 25 to the wiring board 18 side, one end of the insulating member 24 formed with one end opening of the lead-out hole 25 is projected by a predetermined height from the surface S1 of the base 5 facing the stator 4, and the other end of the insulating member 24 formed with the other end opening of the lead-out hole 25 is projected by a predetermined height from the surface S2 of the base 5 on the wiring board 18 side. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a spindle motor built in a hard disk drive or the like.

  Conventionally, in order to reduce the thickness of this type of spindle motor, for example, as shown in FIG. 9, a drive magnet 32 is fixed inside a hub 31 that holds a disk, has a coil 33, and has a hub 31. Is fixed to the base 35, an insulating sheet 36 is affixed to the surface of the base 35 on the stator 34 side, and a flexible wiring board 37 (FPC) is attached to the surface of the base 35 on the motor outer side. It is pasted. The base 35, the insulating sheet 36, and the flexible wiring board 37 are respectively formed with holes 35a, 36a, 37a communicating with each other. A winding end portion 33 a of the coil 33 is led out to the outside of the motor through the holes 35 a, 36 a, and 37 a, and is connected to a land formed on the flexible wiring board 37 with solder 39. The diameters of the holes 36 a formed in the insulating sheet 36 and the holes 37 a formed in the flexible wiring board 37 are smaller than the diameters of the holes 35 a formed in the base 35.

  According to this, since the end portion 33a of the winding of the coil 33 inserted through the holes 35a, 36a, 37a is regulated by the hole 36a of the insulating sheet 36 and the hole 37a of the flexible wiring board 37, the base The inner periphery of the hole 35a of the 35 is not contacted, and thereby insulation from the base 35 is maintained (see Patent Document 1).

  However, in the above-mentioned conventional type, there is a possibility that the end 33a of the winding contacts the inner peripheral surface of the hole 35a of the base 35 due to the bending of the end 33a of the winding of the coil 33. There is a problem that the insulation failure between the end portion 33a and the base 35 cannot be completely suppressed.

Further, when the insulating sheet 36 and the flexible wiring board 37 are attached to the base 35, the position of the hole 36 a of the insulating sheet 36 is shifted with respect to the hole 35 a of the base 35, or the position is flexible with respect to the hole 35 a of the base 35. When the position of the hole 37a of the wiring board 37 is shifted, the possibility that the end portion 33a of the winding contacts the inner peripheral surface of the hole 35a of the base 35 increases. Therefore, it is necessary to accurately center the hole 36a of the insulating sheet 36 and the hole 37a of the flexible wiring board 37 with respect to the hole 35a of the base 35, and there is a problem that the number of assembling steps increases. Furthermore, there is a concern that the insulation sheet 36 and the flexible wiring board 37 may be thermally deformed, changed in vibration, or changed over time, resulting in insulation failure.
Utility Model Registration No. 2551167

  The present invention can improve insulation by suppressing insulation failure between the end of the coil winding led out from the base to the outside of the motor and the base, and can easily assemble the insulating member. An object of the present invention is to provide a spindle motor capable of reducing the number of assembly steps.

In order to achieve the above object, the first invention includes a rotating body to which a drive magnet is fixed, a stator having a coil disposed opposite to the rotating body, and a base to which the stator is fixed. ,
A spindle motor in which the winding end of the coil is led to the outside of the motor through the base from the stator side inside the motor and connected to the power contact member;
An insulating member is inserted into the hole formed in the base,
In the insulating member, a lead-out hole having one end opened on the stator side and the other end opened on the motor outer side is formed.
The end of the winding of the coil is led out from the stator side to the outside of the motor through the extraction hole,
One end portion of the insulating member provided with the one end opening portion of the extraction hole projects a predetermined height from the surface facing the stator of the base, and the other end portion of the insulating member provided with the other end opening portion of the extraction hole is the base. Projecting from the surface of the motor outside by a predetermined height.

  According to this, since the end portion of the coil winding is led out from the stator side inside the motor to the outside of the motor through the drawing hole of the insulating member, the end of the winding is connected to the inner periphery of the hole of the base. Contact with the surface is prevented. In addition, since one end portion of the insulating member protrudes by a predetermined height from the surface facing the stator of the base, and the other end portion of the insulating member protrudes by a predetermined height from the surface of the base outside the motor, Even if the end is bent, it is possible to reliably prevent the end of the winding from coming into contact with the surface facing the stator of the base or the surface of the base outside the motor. As a result, it is possible to suppress insulation failure between the end of the winding of the coil led out from the base to the outside of the motor and the base, and to improve insulation.

  Further, since the insulating member can be assembled by inserting it into the hole of the base, the conventional troublesome work such as centering of the holes is omitted, and the number of assembling steps can be reduced.

In the second invention, a plurality of holes are formed in the base.
The insulating member is composed of a plurality of cylindrical portions inserted into the respective hole portions, and a connecting portion that integrally connects these cylindrical portions,
A lead-out hole is formed in each cylindrical part,
The ends of the windings of the plurality of coils are led out through the respective extraction holes of the insulating member.

According to the third aspect of the present invention, a wiring board is attached to the surface of the base motor outside as a power contact member.
According to this, since the end of the winding of the coil is led out from the stator side to the wiring board side through the lead hole of the insulating member, the end of the winding contacts the inner peripheral surface of the hole of the base It is prevented from doing. In addition, since one end portion of the insulating member protrudes by a predetermined height from the surface facing the stator of the base, and the other end portion of the insulating member protrudes by a predetermined height from the surface of the base on the wiring board side, Even if the end portion is bent, it is possible to reliably prevent the end portion of the winding from coming into contact with the surface facing the stator of the base or the surface of the base on the wiring board side. As a result, it is possible to suppress insulation failure between the end of the winding of the coil led out to the wiring board side and the base, and to improve insulation.

Further, in the fourth invention, the insulating member has an overlapping portion that covers the edge portion of the wiring board,
The overlapping portion is formed in the wiring direction of the end portion of the winding led out to the wiring board side through the extraction hole.

  According to this, the insulation between the end of the coil winding and the base can be further improved.

  According to the present invention, it is possible to suppress insulation failure between the end of the winding of the coil led out from the base to the outside of the motor and the base, and to improve insulation, and to achieve thermal deformation, vibration change, or aging. Reliable insulation can be exhibited even with changes. Further, since the conventional troublesome work such as centering is omitted, the number of assembling steps can be reduced.

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, reference numeral 1 denotes a spindle motor built in a hard disk drive or the like, and includes a rotating body 2, a stator 4 disposed opposite to the rotating body 2 and having a coil 3, and the stator 4 is fixed. And a base 5.

  The rotating body 2 includes a shaft 8 that is rotatably inserted into a cylindrical sleeve 7 and a hub 9 that is attached to the tip of the shaft 8. A magnetic disk (not shown) is fixed to the outer peripheral portion of the hub 9, and an annular driving magnet 10 is attached to the inner peripheral portion of the hub 9 via a yoke 11.

  A thrust flange 12 is screwed to the base end of the shaft 8, and a thrust plate 13 facing the circular flat portion of the thrust flange 12 is fixed to the sleeve 7. Lubricating oil is injected into the gap between the thrust flange 12 and the sleeve 7, between the thrust flange 12 and the thrust plate 13, and between the peripheral surface of the shaft 8 and the inner peripheral surface of the sleeve 7. 15 and a radial bearing 16 are formed.

  The base 5 is composed of a disk-shaped part 5a and a cylindrical part 5b erected at the center of the disk-shaped part 5a. The sleeve 7 is inserted and fixed in the cylindrical portion 5b. The stator 4 is provided on the outer periphery of the cylindrical portion 5b.

  As shown in FIGS. 1 and 2, a flexible wiring board 18 (FPC), which is an example of a power contact member that can be connected to an external power source, is provided on the surface of the disk-shaped portion 5a of the base 5 on the outside of the motor. It is pasted. Further, end portions 19 of a plurality of windings (four in FIG. 2) of the coil 3 pass through the disk-shaped portion 5a of the base 5 from the stator 4 side inside the motor and are on the flexible wiring board 18 side (that is, the motor). And is connected to the land of the flexible wiring board 18 with solder 21.

  As shown in FIGS. 3 and 4, the disk-like portion 5a of the base 5 has a plurality of openings (a surface S1 facing the stator 4 and a surface S2 on the flexible wiring board 18 side) (FIG. 3A). 4 holes) 22 are formed. Insulating members 24 made of resin are inserted into the hole portions 22, and the insulating member 24 insulates the end portions 19 of the windings of the coil 3 from the disk-shaped portion 5 a of the base 5.

  The insulating member 24 includes a plurality of (four in FIGS. 3 and 4) cylindrical portions 24a inserted into the respective hole portions 22, and connecting portions 24b that integrally connect one end portions of the cylindrical portions 24a. It consists of and. Each cylindrical portion 24a is formed with an extraction hole 25 having one end opened on the stator 4 side and the other end opened on the flexible wiring board 18 side. As shown in FIG. 3B, when the cylindrical portions 24 a are inserted into the hole portions 22, the connecting portions 24 b are applied to the surface S <b> 1 of the disk-shaped portion 5 a of the base 5, and the extraction holes 25 are inserted. One end portion of the insulating member 24 having the one end opening protrudes from the surface S1 of the base 5 facing the stator 4 by a predetermined height H1 (that is, an amount corresponding to the thickness of the connecting portion 24b), and the drawer The other end of the insulating member 24 having the other end opening of the hole 25 protrudes from the surface S2 of the base 5 on the flexible wiring board 18 side by a predetermined height H2.

  As shown in FIGS. 2 and 4, the holes 22 are arranged on an arc centered on the axis 8a of the shaft 8, and the connecting portion 24b of the insulating member 24 is centered on the axis 8a. It is formed in a circular arc shape. The cylindrical portion 24a and the connecting portion 24b are bonded and fixed to the disc-like portion 5a of the base 5 with an adhesive or the like. The end portions 19 of the plurality of windings of the coil 3 are led out from the stator 4 side to the flexible wiring board 18 side through the extraction holes 25 of the insulating member 24.

Hereinafter, the operation of the above configuration will be described.
As shown in FIGS. 1 and 3, since the end 19 of the winding is led out from the stator 4 side to the flexible wiring board 18 through the lead-out hole 25 of the insulating member 24, the end of the winding It is prevented that 19 contacts the inner peripheral surface of the hole portion 22 of the base 5. Further, since one end portion of the insulating member 24 protrudes from the surface S1 of the base 5 by a predetermined height H1, and the other end portion of the insulating member 24 protrudes from the surface S2 of the base 5 by a predetermined height H2, the above winding Even if the end portion 19 of the wire is bent, it is possible to reliably prevent the end portion 19 of this winding from coming into contact with the surfaces S1 and S2 of the base 5. As a result, the insulation failure between the end 19 of the winding and the base 5 can be suppressed, and the insulation can be improved.

  Furthermore, since the insulating member 24 can be assembled to the base 5 by inserting each cylindrical portion 24a of the insulating member 24 into each hole portion 22 of the base 5, it is troublesome such as centering of holes as in the prior art. Therefore, the number of assembly steps can be reduced. In addition, since the plurality of cylindrical portions 24a are integrally connected by the connecting portion 24b, the cylindrical portions 24a can be collectively inserted into the hole portions 22 of the base 5 at a time. Very improved.

The driving power is supplied to the coil 3 from the external power source through the flexible wiring board 18 and the end 19 of the winding.
In the first embodiment, the flexible wiring board 18 is attached to the base 5 as an example of the power contact member. However, as another example of the power contact member, a printed board that can be connected to an external power source is used. May be. In this case, the printed circuit board is separate from the spindle motor 1, and the printed circuit board is arranged opposite to the outer surface S <b> 2 of the disk-like portion 5 a of the base 5 with a predetermined interval, and the winding led out to the outside of the base 5. The end 19 of the wire is connected to the connector of the printed circuit board. As a result, drive power is supplied to the coil 3 from the external power source via the printed circuit board and the end 19 of the winding. Further, the end 19 of the winding may be directly connected to the printed board without using the connector.

  In the first embodiment, when the insulating member 24 is attached to the base 5, the connecting portion 24b is applied to the surface S1 of the base 5, but as a second embodiment, as shown in FIG. The insulating member 24 may be attached to the base 5 by applying the connecting portion 24b to the surface S2 on the opposite side of the base 5.

  Furthermore, in 2nd Embodiment, as shown in FIGS. 5-8, the overlap part 24c which covers the outer edge part of the flexible wiring board 18 from the outer side is provided in the inner peripheral side of the connection part 24b. . The overlapping portion 24 c protrudes in the inner direction toward the axis 8 a (that is, the wiring direction when the end 19 of the winding is connected to the flexible wiring board 18 with the solder 21).

  According to this, the gap 27 (see FIG. 8) between the outer edge portion of the flexible wiring board 18 and the connecting portion 24b of the insulating member 24 is covered with the overlapping portion 24c. Insulating properties can be further improved.

  In each of the above-described embodiments, the winding end 19 of the coil 3, the cylindrical portion 24 a of the insulating member 24, the hole 22, and the four extraction holes 25 are provided, respectively. A plurality and a plurality other than four may be provided.

  In each of the above embodiments, each cylindrical portion 24a of the insulating member 24 is inserted into each hole 22 of the base 5 and bonded with an adhesive, but each cylindrical portion 24a is not glued. The insulating member 24 may be fixed to the base 5 by press-fitting into each hole 22.

In each of the above embodiments, the insulating member 24 includes the cylindrical portion 24a. However, the insulating member 24 may include a cylindrical portion other than the cylinder, for example, a square cylindrical portion.
In each of the above embodiments, the plurality of cylindrical portions 24a are integrally connected by the connecting portion 24b. However, the plurality of cylindrical portions 24a may be provided independently without providing the connecting portion 24b.

  Further, as shown in FIG. 3B, the predetermined heights H1 and H2 may be H1 = H2, or H1 ≠ H2.

  The present invention can be applied not only to a spindle motor for a hard disk drive but also to a video tape recorder and other motors.

It is sectional drawing of the spindle motor in the 1st Embodiment of this invention. FIG. 6 is a view of the base of the spindle motor, where (a) is a view of the base on which the insulating member is mounted as viewed from the flexible wiring board side, and (b) is a view of the base as viewed from the stator side. FIG. 4 is a diagram of an insulating member of the spindle motor, where (a) is a diagram before the insulating member is mounted on the base, and (b) is a diagram where the insulating member is mounted on the base. FIG. 6 is a perspective view of an insulating member of the spindle motor, showing a state before being mounted on the base. It is a perspective view of the insulation member of the spindle motor in the 2nd Embodiment of this invention, and shows the state before mounting | wearing with a base. It is sectional drawing of a spindle motor. FIG. 6 is a view of the base of the spindle motor, where (a) is a view of the base on which the insulating member is mounted as viewed from the flexible wiring board side, and (b) is a view of the base as viewed from the stator side. FIG. 6 is a longitudinal sectional view of an insulating member of the spindle motor, showing a state where the spindle motor is mounted on a base. It is sectional drawing of the derivation | leading-out part of the coil | winding end part of the coil of the conventional spindle motor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Spindle motor 2 Rotating body 3 Coil 4 Stator 5 Base 10 Drive magnet 18 Flexible wiring board 19 End part 22 Winding part 24 Insulation member 24a Cylindrical part 24b Connection part 24c Overlap part 25 Lead hole S1 Opposite to the stator of the base Surface S2 Base flexible wiring board side surface H1, H2 Predetermined height

Claims (4)

A rotating body to which a drive magnet is fixed, a stator having a coil disposed opposite to the rotating body, and a base to which the stator is fixed;
A spindle motor in which the winding end of the coil is led to the outside of the motor through the base from the stator side inside the motor and connected to the power contact member;
An insulating member is inserted into the hole formed in the base,
In the insulating member, a lead-out hole having one end opened on the stator side and the other end opened on the motor outer side is formed.
The end of the winding of the coil is led out from the stator side to the outside of the motor through the extraction hole,
One end portion of the insulating member provided with the one end opening portion of the extraction hole projects a predetermined height from the surface facing the stator of the base, and the other end portion of the insulating member provided with the other end opening portion of the extraction hole is the base. A spindle motor characterized by projecting a predetermined height from the surface of the motor outside. A plurality of holes are formed in the base,
The insulating member is composed of a plurality of cylindrical portions inserted into the respective hole portions, and a connecting portion that integrally connects these cylindrical portions,
A lead-out hole is formed in each cylindrical part,
2. The spindle motor according to claim 1, wherein end portions of the windings of the plurality of coils are led out through the respective extraction holes of the insulating member. 3. The spindle motor according to claim 1, wherein a wiring board is attached to a surface of the base outside the motor as a power contact member. The insulating member has an overlapping portion that covers the edge of the wiring board,
4. The spindle motor according to claim 3, wherein the overlapping portion is formed in the wiring direction of the end portion of the winding led out to the wiring board side through the lead-out hole.

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