JP3481278B2 - Spindle motor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spindle motor for rotating a recording member such as an optical / magnetic disk.

[0002]

2. Description of the Related Art The inside of a drive unit in which a recording disk such as an optical / magnetic disk is housed is filled with clean air. The spindle motor that rotates the recording disk
Sealing treatment is performed so that unclean air mixed with oily smoke of lubricant existing inside the motor does not leak to the outside of the motor, that is, the accommodation chamber. The spindle motor is
A stationary member fixed to a drive device such as a bracket or a housing, a stator provided on the stationary member, a rotor hub on which a disc is mounted, a rotor magnet mounted on the rotor hub, and a stationary member and a rotor hub. And a rotor hub driven to rotate relative to the stationary member. Further, a magnetic fluid seal device or a labyrinth seal structure for sealing the inside and outside of the motor is provided at a portion outside the bearing of the spindle motor.

[0003]

In the spindle motor having the above structure, for example, a stator is mounted on a fixed shaft, a pair of bearings are mounted so as to sandwich the stator, and a rotor hub is rotatably supported via the bearings. There is a so-called fixed shaft type spindle motor. In this type of spindle motor, but is derived to motors exterior through a through hole provided with a coil lead wire drawn from the stator to the sheet Yafuto, the withdrawal process and drawers coil leads and the motor external power source When
Easy and reliable electrical connection of
Source that reduces workability and spindle motor reliability
It is a cause.

The present invention has been made in view of the above problems existing in the prior art. The problem is that the stator and the power source outside the motor are electrically connected.
It is to provide a spindle motor capable of improving workability and reliability by easily and surely performing .

[0005]

In order to solve the above-mentioned problems, the spindle motor of the present invention has a stationary member, a rotor hub which is rotatably supported by the stationary member, and the stationary member. Provided rotor magnet,
In the spindle motor including: a relay connection part, in which a plurality of electrodes are arranged in a predetermined manner, is provided on the stationary member,
A coil lead wire pulled out from the stator is electrically connected to the relay connection portion, and a connection terminal portion having a plurality of flexible electrodes is electrically connected to an end portion of the relay connection portion. The coil lead wire is energized as required by the end portion of the terminal portion being pressed into contact with the power supply electrode and electrically connected, and the connection terminal portion is formed separately from the relay connection portion.
After that, a spindle motor is provided which is characterized in that it is attached to the relay connection .

According to another aspect of the present invention, the bracket, the fixed shaft supported by the bracket, the rotor hub relatively rotatably supported by the fixed shaft, the stator fixed by the fixed shaft, and the stator facing the stator. A rotor magnet provided on the rotor hub,
A spindle motor having: a hole formed in the fixed shaft, the hole extending from a corresponding portion to which the stator is mounted to at least one end of the fixed shaft;
The coil lead wire pulled out from the stator is led out to the outside of the motor through the hole portion, and the bracket is provided in the opening portion of the fixed shaft end portion where the coil lead wire is led out through the hole portion. Separately, a protruding member extending radially outward is attached, and the protruding member is a phosphorus member.
Attach a ring-shaped or arc-shaped member to the outer peripheral surface of the shaft end.
Are those attached to fitting, by the protruding member,
A spindle motor is provided, wherein the coil lead wire is regulated radially outward and is led out from the fixed shaft end portion.

[0007]

According to the spindle motor of the first aspect, the coil lead wire from the stator is electrically connected to the relay connection portion in advance, and the relay connection portion has a connection terminal having a flexible electrode at an end thereof. Parts are electrically connected. Therefore, the stator is electrically connected to the power supply electrode from the outside of the motor only by pressing the connection terminal portion (the electrode portion thereof) .

According to the spindle motor of the second aspect, the opening at the end of the fixed shaft on the side where the coil lead wire is led out.
The portion is provided with a protruding portion that extends radially outward,
This protrusion, co Irurido line is derived from the fixed shaft end is restricted radially outward. For this reason,
Also the ends of the coil lead wire lead-out side of the fixed shaft is fixed to the housing and the bracket, the coil leads can be derived to avoid the clogging portion of the fixed shaft. Therefore, the coil lead wire can be easily led out from the inside of the motor to the outside .

[0009]

Embodiments of the spindle motor according to the present invention will be described with reference to the accompanying drawings. FIG. 1 shows a first embodiment of a spindle motor that rotationally drives a magnetic disk, for example, and shows an overall cross section thereof. In FIG. 1, a member 2 is a housing that is mounted and fixed to a drive device (not shown). The housing 2 has a shallow dish shape,
It is composed of a flat base portion 29, a flange portion 26 protruding outward from the base portion 29 in the radial direction, and a cylindrical boss portion 20 formed radially inward of the base portion 29. The housing 2 is formed of aluminum alloy or the like into a predetermined shape. The stator 4 is fixed to the step portion 34 provided on the outer peripheral side of the boss portion 20.

The stator 4 includes a stator core 46 formed by laminating a predetermined number of electromagnetic steel sheets, and the stator core 4
6 and the armature coil 47 wound a required number of times,
As shown in the figure, the inner peripheral portion 36 on the lower side of the stator core 46 and the step portion 34 of the boss portion 20 are fixed by adhesion.
Further, one end of the fixed shaft 1 is fitted and fixed in a hole 38 provided on the inner peripheral side of the boss portion 20 in the housing 2. Then, the screw is fixed to the mounting hole portion 15 formed in the collar portion 26 and fixed to the drive device.

The member 3 is a rotor hub on which a magnetic disk is mounted and, for example, magnetic stainless steel is used. The rotor hub 3 has an inverted bowl shape with an air-core center portion,
The outer peripheral portion 33 of the outer peripheral wall 48, magnetic disk (not shown) is mounted is fitted. On the lower side of the outer peripheral wall 48 in the figure, an annular support portion 40 that further projects outwardly.
Is provided, and the magnetic disk is received by the support portion 40. Accordingly, when the clamp is screwed into the clamp screw hole 21 provided in the base portion 14 of the rotor hub 3 using a clamp (not shown), the magnetic disk is tightly fixed to the rotor hub 3.

The rotor hub 3 has a base portion 14 on the inner side in the radial direction.
It has a cylindrical portion 24 that is provided so as to hang down from it. A pair of ball bearings 6 and 7 are provided between the cylindrical portion 24 and the outer peripheral portion 22 of the fixed shaft 1. A cylindrical rotor magnet 5 is fixed to the inner peripheral portion 37 of the outer peripheral wall 48 of the rotor hub 3 by adhesion, and the rotor magnet 5 is arranged to face the stator 4 in the radial direction.

The rotor magnet 5 is provided with N poles and S poles alternately magnetized in the circumferential direction so that the required number of poles is magnetized.
A lower end surface 23 of the base portion 14 inside the rotor hub 3,
A seal holding member 9 is provided between the rotor magnet 5 and the upper end thereof. Here, the seal holding member 9 will be described with reference to FIG. 4 shows the seal holding member 9, FIG. 4 (a) is a plan view, and FIG. 4 (b) is FIG.
It is sectional drawing in XX 'of (a). 1 and 4
In the above, the seal holding portion 9 is made of a thin steel plate, and is formed by plastic working such as press working.

The seal holding member 9 is provided with four cut-and-raised portions 17 in a 90-degree rotational symmetry on the outer peripheral end of the annular base portion 27. The cut-and-raised portion 17 is formed to have a substantially trapezoidal cross section, and a tip portion 39 (hereinafter, referred to as a contact portion 39) of the cut-and-raised portion 17 contacts the upper end of the magnet 5. That is, the cut-and-raised portion 17 of the seal holding member 9 defines the gap size between the lower end surface 14 inside the rotor hub 3 and the upper end of the rotor magnet 5, and thus functions as a spacer that defines the mounting height position of the rotor magnet 5. Since the rotor magnet 5 has a cylindrical shape, the abutting portion 39 may be provided with at least three base portions 27 that define a plane. In the present embodiment, the contact portion 39 has a substantially trapezoidal cross section so as to come into surface-contact with the rotor magnet 5, but in addition to this, it has a cross-sectional shape so as to come into point-contact with the rotor magnet 5. The shape may be triangular or arcuate.

The contact portion 39 allows the magnetic centers of the stator core 46 and the rotor magnet 5 to be easily aligned with each other, and the dimensions are set by plastic working even when different types of length and shape are used. You can easily respond to changes. Then, the seal holding member 9 has the base 2
7 covers the lower end surface 23 of the rotor hub 3, closes the clamp screw holes 21, and also functions as a seal member for sealing the inside and outside of the motor. That is, the clamp screw hole 21 in the rotor hub 3 is provided so as to allow the treatment liquid to sufficiently penetrate into the clamp screw hole 21 when the surface treatment of the rotor hub 3 is performed. Therefore, the penetrating clamp screw hole 21 is reliably closed by the base portion 27 of the seal holding member 9. Moreover, since the contact portion 39 is held and fixed by the rotor magnet 5, the base portion 27 has a lower end surface.
There is no peeling or dropping from 23 . As a result, the inside and outside of the motor are reliably sealed.

Further, the seal holding member 9 is made of a magnetic material. Although this is not applied to the present embodiment, when the rotor hub 3 is made of a non-magnetic material such as an aluminum alloy, the magnetic flux from the rotor magnet 5 and the stator 4 is generated by the rotor hub 3. It passes through the upper part and leaks to the magnetic disk side. However,
The seal holding member 9 can effectively shield the magnetic flux that is about to leak. That is, the seal holding member 9
Also functions as a magnetic shield member.

FIG. 2 is a bottom view of the spindle motor of FIG. 1 seen from the bottom of the drawing. 1 and 2, the four coil lead wires 30 drawn from the armature coil 47 of the stator 4 pass through the corresponding insulating bushes 19 provided on the base portion 29 of the housing 2 to the outside of the motor (the housing of FIG. 1). 2 (lower side). A printed circuit board (relay connection circuit board) 12 is attached to the bottom surface of the lower side of the housing 2 outside the motor. Each coil lead wire 30 is electrically connected to the land portion 25 of the printed circuit board 12 by soldering or the like.

A land portion 2 is provided on the printed circuit board 12.
Electrical connection part 4 from 5 through the conductive pattern 41 to the end
2, a connection terminal 8 for supplying power from the outside is provided. The perspective view shown in FIG. 3 shows how the connection terminals 8 are mounted on the printed circuit board 12. As shown in FIG. 3, in the connection terminal 8, four electrode portions 16 are integrally formed on a base portion 31 formed of an insulating resin material. The electrode portion 16 has a substantially U shape, and the center portion thereof is positioned with the base portion 31 (the groove portion 44 thereof) as a substantially center.

That is, the lower end portion 43 which is one end of the electrode portion 16
Is electrically connected to the electrical connection portion 42 of the printed circuit board 12 by soldering or the like, and the projection 35 (contact 35) provided on the upper end 49 at the other end is pressed against an external electrode (not shown). Electrically connected. As the electrode portion 16, a base material such as phosphor bronze plated with a noble metal is used.
Therefore, only by connecting the connection terminal 8 of the spindle motor to the power supply electrode of the magnetic disk drive device, the electric connection can be surely made, and the labor required for the connection can be saved. In addition, since the corresponding position and the range in which it can be connected have a high degree of freedom, even if the drive device has various connection specifications, the use range is expanded without limitation.

In FIG. 1, the magnetic fluid seal 10 is provided on the inner peripheral side of the annular projection 45 formed on the upper end of the rotor hub 3.
Are attached via a holding member 32 made of a non-magnetic material. The magnetic fluid seal 10 prevents the lubricant of the (upper) ball bearing 6 and the impure air inside the motor from leaking out of the motor (upward in the drawing). Similarly,
Leaky air from the (lower) ball bearing 7 is prevented from leaking by the labyrinth seal structure having the following configuration. The cylindrical portion 24 of the rotor hub 3 and the inner peripheral portion 3 of the stator core 46
6 and a minute gap between the support portion 40 of the rotor hub 3 and the flange portion 26 of the housing 2.

Further, in order to seal the inside and outside of the motor, at the end portion of the insulating bush 19 where the coil lead wire 30 is led out, the printed circuit board 12 itself is attached by sealing, and the insulating bush 19 is sealed. Sealing can also be performed by filling the site with an adhesive or the like. These can be easily sealed from the outside of the motor. The above magnetic fluid seal 1
The member 11 provided on the upper part of 0 is the magnetic fluid seal 10
This is a protective cap that prevents foreign matter from entering the seal layer and destroying it.

Next, FIG. 5 shows a spindle motor of a second embodiment according to the present invention, and shows an entire cross section of a spindle motor for rotationally driving a magnetic disk. In FIG. 5 , the fixed shaft 101 is fitted and fixed to a bracket 102 having a substantially disc shape at its lower portion.
The spindle motor is screwed to the screw hole 124 of the fixed shaft 101 at its upper portion, and screwed to the screw hole 118 provided at the peripheral portion of the bracket 102 at the lower portion of the motor to be fixed to the drive device.

In the spindle motor of this embodiment, the stator 104 is attached to the fixed shaft 101 at substantially the center thereof. In the fixed shaft 101 , this stator 1
A pair of ball bearings 106 and 107 are mounted on both sides (upper and lower sides in the drawing) of 04 to sandwich them. The substantially cylindrical rotor yoke 110 has a ball bearing 106 on the upper side of the drawing.
And rotatably supported by the ball bearing 107 via a bush 117 (spacer 117) on the lower side of the drawing. The rotor yoke 110 is made of a magnetic material such as steel, and has a small diameter portion 115 and a large diameter portion 120 formed coaxially. Then, the cylindrical rotor magnet 105 arranged to face the stator 104 is fixed to the large-diameter portion 120.

A rotor hub 103 is fitted and fixed on the outer peripheral side of the rotor yoke 110. The rotor hub 103 is made of, for example, an aluminum alloy. In order to prevent distortion / deformation of the rotor hub 103 due to a difference in thermal expansion with the rotor yoke 110, the rotor hub 103 and the rotor yoke 110 are fitted and fixed only at a substantially central position in the axial direction. Therefore, in the other portions of the both, a slight gap is provided over the entire circumference.
The outer shape and configuration of the rotor hub 103, the mounting method of the magnetic disk, and the like are substantially the same as those of the first embodiment already described, and thus the description thereof is omitted. The rotor hub 103
In, the portion 108 is a screw hole for mounting the clamp. The part 122 is a rotation-stopping hole used to prevent the rotor hub 103 from rotating when the clamp is attached.

A magnetic fluid seal 121 for sealing the upper portion of the spindle motor is fixed to the rotor yoke 110 via a holding member 111 on the upper side of the drawing in this embodiment. A labyrinth seal structure for sealing the lower part of the spindle motor is provided on the lower side of the figure. The labyrinth seal structure is formed by an annular bush 117 and a bracket 102. That is, a small gap is formed in the radial direction between the annular protrusion 109 protruding downward from the bush 117 and the annular groove 116 provided in the bracket 102.

The stator 104 is positioned and fixed in the axial direction by a collar 113 provided in the substantially central portion of the fixed shaft 101. The collar portion 113 has a diameter increased in the circumferential direction and is formed integrally with the fixed shaft 101.
The collar 113 may have a similar structure by fitting and fixing another ring-shaped member. The corresponding portion of the fixed shaft 101 on which the stator 104 is mounted, that is, the stator 1 in the figure.
A hole 129 penetrating to the lower end of the fixed shaft 101 is provided at a corresponding portion of the fixed shaft 101 that is close to the lower part of 04. And pulled out from the stator 104
The coil lead wire 126 is led out of the motor through the hole 129.

Lower end 13 of fixed shaft 101 in the figure
7 is provided with a screw hole 114 and is screwed to the magnetic disk drive device, the coil lead wire 126 led out from the hole 129 cannot necessarily be pulled out to the outside of the motor. However, in this configuration, the fixed shaft 101 from which the coil lead wire 126 is drawn out
A notch portion 138 extending in the radial direction (right side in the drawing) and the lower end of the fixed shaft 101 is provided in the lower part of the outer peripheral portion 128, and a protruding portion 127 extending outward in the radial direction is provided on the outer peripheral portion 128. As a result, as shown in the drawing, the coil lead wire 126 is led out from the notch 138 radially outward (to the right in the drawing) while being restricted by the protrusion 127 at the lower end of the fixed shaft 101 . . Further, the recessed portion 13 is formed on the bottom surface 123 of the bracket 102 so that the coil lead wire 126 can be easily led out.
9 is provided, and the concave portion 139 and the protruding portion 127 form a guide path.

Thus, at the end of the fixed shaft 101,
Even if there is a threaded portion 114 or the like that prevents the coil lead wire 126 from being drawn out, the protrusion 127 causes the coil lead wire 126
Can bypass this and be led out of the motor. In addition, the coil lead wire 126 is
It is also prevented that the electrical insulation is impaired due to contact with the screw attached to No. 4. In addition, the protrusion 127 has
It is desirable to use a ring member with high electrical insulation,
Various resin materials can be adopted. The protrusion 127 is not limited to the ring shape as in the present embodiment, and may have an arc shape that does not reach the entire circumference. The protrusion 127 is
It suffices that it is provided at least in the portion of the fixed shaft 101 from which the coil lead wire 126 is led out, and in that direction.

Although the respective embodiments of the spindle motor according to the present invention have been described above, the design changes or modifications can be freely made without departing from the spirit of the present invention. For example, the spindle motor of the present invention may be configured as a stationary member, a housing or a bracket to which the fixed shaft is fixed, and the base member itself that defines the disk drive device. Also has been described a spindle motor for rotating the magnetic disk in the present embodiment is not limited to this, it is also applied to a spindle motor for rotating the load such as an optical disk or a rotating multi-face mirror.

Since the spindle motor of the present invention has the above-mentioned structure, it has the following effects. That is, according to the spindle motor of the first embodiment corresponding to claim 1 of the present invention, the coil lead wire 30 from the stator 4 is electrically connected to the printed circuit board (relay connection portion) 12 in advance. A connection terminal 8 having a flexible electrode portion 16 at the other end is electrically connected to the printed circuit board (relay connection portion) 12. Therefore, the stator 4 is electrically connected to the power supply electrode from the outside of the motor only by pressing the electrode portion 16 of the connection terminal 8 into pressure .

According to a second embodiment corresponding to claim 2 of the present invention, the fixed shaft 101 from which the coil lead wire 126 is led out is radially outward on the opening side of the end portion 137 (of the hole portion 129). The protruding portion 127 is provided to extend to the outside of the motor, and the protruding portion 127 restricts the coil lead wire 126 outward in the radial direction and guides the coil lead wire 126 from the end of the fixed shaft 101 to the outside of the motor. Therefore, the coil lead wire 126 is fixed even if the coil lead wire 126 lead-out side of the fixed shaft 101 is fixed and blocked by the housing or the bracket.
Can be led out while avoiding the closed portion of the fixed shaft 101 . In addition, the coil lead wire 126 does not suffer deterioration of electrical insulation due to contact with such obstacles. Therefore, the coil lead wire 126 can be easily led out of the motor, and the electric power can be reliably supplied to the power source outside the motor.
Can be connected.

[Brief description of drawings]

FIG. 1 is a sectional view showing an entire spindle motor according to a first embodiment of the present invention.

FIG. 2 is a bottom view of the spindle motor according to FIG.

FIG. 3 is an enlarged perspective view of a connection terminal incorporated in the spindle motor according to FIG.

FIG. 4 shows a seal holding member incorporated in the spindle motor according to FIG. 1, FIG. 4 (a) is a plan view thereof, and FIG. 4 (b) is a cross section taken along line XX ′ in FIG. 4 (a). It is a figure.

FIG. 5 is a sectional view showing an entire spindle motor according to a second embodiment of the present invention .

[Explanation of reference numerals] 1,101 fixed shaft 3,103 rotor hub 4,104 stator 5,105 rotor magnet 10,121 magnetic fluid seal 30,126 coil lead wire 12 printed circuit board

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shin Hirono 225 Arayama Ichibanya, Mineyama-cho, Fuchu-gun, Kyoto 225 Nidec Corporation Mineyama Plant (72) Inventor Yoshiki Nagashima 225 Arayama, Arayama, Mineyama-cho, Fuchu-gun, Kyoto Nidec Corporation Mineyama Plant (56) References JP-A-5-135487 (JP, A) JP-A-4-359658 (JP, A) Actually open 3-74181 (JP, U) Actually open-5 -11197 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) H02K 3/50 H02K 5/10 H02K 5/22

Claims (2)

(57) [Claims] 1. A stationary member, a rotor hub relatively rotatably supported by the stationary member, a stator provided on the stationary member, and a rotor magnet provided on the rotor hub facing the stator. In the spindle motor, the stationary member is provided with a relay connection part in which a plurality of electrodes are arranged in a predetermined manner, and the relay connection part is electrically connected to a coil lead wire pulled out from the stator and has an end portion. and the connecting terminal portion is electrically connected with an electrode of a plurality of flexible, by which one end of the connecting terminal portion is electrically connected in pressure contact with the power supply electrode, it is required energizing the coil lead wire And the connection terminal part is made separately from the relay connection part.
A spindle motor characterized in that it is attached to the relay connection part later . 2. A bracket, a fixed shaft supported by the bracket, a rotor hub rotatably supported by the fixed shaft, a stator fixed by the fixed shaft, and a rotor hub provided facing the stator. And a rotor magnet, wherein the fixed shaft is provided with a hole penetrating from at least one corresponding fixed shaft end to at least one fixed shaft end, and the coil drawn from the stator. The lead wire is led out to the outside of the motor through the hole, and the opening of the end of the fixed shaft on the side where the coil lead wire is led out through the hole extends outward in the radial direction separately from the bracket. A protruding member is attached,
The projecting member is a ring-shaped or arc-shaped member,
Are those mounted externally fitted to the preparative end outer peripheral surface, by the protruding member, the coil lead is derived from the fixed shaft end is regulated radially outward, and wherein the Spindle motor.