JP6231028B2 - Spindle motor - Google Patents

Description

  The present invention relates to a spindle motor.

  Conventional spindle motors include those disclosed in Patent Documents 1 and 2. The spindle motor disclosed in Patent Document 1 includes a through hole provided in a base portion to which a stator is fixed, and an insertion hole provided in a circuit board located outside the base portion, and a coil end of the stator. A plurality of leader lines constituting the above are bundled together and pulled out from the through hole and the insertion hole and connected to the circuit board.

  On the other hand, the spindle motor disclosed in Patent Document 2 has a structure in which a plurality of through holes are provided in the base portion as a configuration in which a plurality of lead lines are drawn from the base portion in order to connect the coil to the circuit board, and one through-hole is provided. Only one lead line is drawn out from the hole.

JP 2000-209804 A JP 2011-234602 A

In the configuration of the spindle motor disclosed in Patent Document 1, since a plurality of leader lines are bundled and drawn out from one hole, it is difficult to identify which leader line is which terminal.
On the other hand, in the configuration of the spindle motor disclosed in Patent Document 2, since the through hole is provided for each lead wire, the above-described problem can be avoided. This increases the number of the bases, which may reduce the rigidity of the base portion.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a spindle motor that can easily identify which terminal is a lead wire of a coil while suppressing a decrease in rigidity of a base portion. And

In order to achieve the above object, a spindle motor according to the present invention includes:
A base part;
A stator located on one side of the base portion and having a coil;
A rotor positioned on the one side of the base portion and rotating with respect to the stator;
The base portion is provided with a plurality of lead holes through which the lead wires of the coil pass from the one side to the other side,
The plurality of lead lines include one common line,
Of the plurality of lead holes, one is a common lead hole through which two lead lines including the common line are led out together, and the other lead lines other than the two lead lines are led out one by one. Is a dedicated drawer hole,
It is characterized by that.

Further, a circuit board having a plurality of pad portions for connecting each of the plurality of lead lines is provided on the other side of the base portion,
The base portion is recessed toward the one side, and has a storage portion for storing the pad portion.
The said extraction hole may be formed in the said accommodating part.

In addition, the pad portion is provided corresponding to each of the plurality of lead lines, of which a portion connected to the common line is a common pad portion, and is led out from the common lead hole together with the common line. What is connected to the wire as the terminal pad portion, and what is connected to the lead wire drawn from the dedicated lead hole is the dedicated pad portion,
A distance between at least one of the common pad portion or the terminal pad portion and the common extraction hole may be longer than a distance between the dedicated pad portion and the exclusive extraction hole.

In addition, the pad portion is provided corresponding to each of the plurality of lead lines, of which a portion connected to the common line is a common pad portion, and is led out from the common lead hole together with the common line. If the terminal pad part is connected to the line,
The common lead-out hole may be provided at a position where the distance from the common pad portion and the distance from the terminal pad portion are substantially the same.

In addition, the pad portion is provided corresponding to each of the plurality of lead lines, of which the one connected to the lead line led out from the dedicated lead hole is a dedicated pad portion,
The dedicated extraction hole is provided through the accommodating portion and the dedicated pad portion,
The lead wire drawn out from the dedicated lead hole and the dedicated pad portion may be soldered in a state of covering the dedicated lead hole.

The pad portion is provided corresponding to each of the plurality of lead lines,
The extraction hole is provided through the housing portion and the circuit board,
The pad portion and the extraction hole may be arranged along a predetermined direction.

Further, the predetermined direction may be a substantially circumferential direction around the rotation axis of the rotor.
Moreover, the diameter of the said common extraction hole may be larger than the diameter of the said exclusive extraction hole.

  According to the present invention, it is possible to easily identify which terminal is the lead wire of the coil while suppressing a decrease in rigidity of the base portion.

It is sectional drawing of the spindle motor which concerns on 1st Embodiment of this invention. It is a principal part bottom view of the spindle motor shown in FIG. It is a schematic diagram which shows an example of the coil | winding method of a coil. (A) And (b) is a schematic diagram which shows an example of the formation area of solder. It is a principal part bottom view of the spindle motor which concerns on 2nd Embodiment of this invention. It is a principal part bottom view of the spindle motor which concerns on 3rd Embodiment of this invention.

  A spindle motor according to an embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
As shown in FIG. 1, the spindle motor 100 according to the first embodiment of the present invention is configured as an outer rotor type spindle motor. For example, the spindle motor 100 rotates a magnetic disk of a hard disk drive (HDD) (not shown).

  As shown in FIGS. 1 and 2, the spindle motor 100 includes a rotor 10, a stator 20, a sleeve 30, a magnetic attraction plate 40, a base portion 50, and a circuit board 60.

FIG. 1 is a sectional view of the spindle motor 100. FIG. 2 is a bottom view (bottom view) of the main part showing the vicinity of the circuit board 60 of the spindle motor 100. In consideration of the visibility of the drawings, solder and adhesive formed as described later are omitted in FIGS. 1 and 2 (the same applies to FIGS. 5 and 6 described later).
Hereinafter, in order to facilitate understanding of the configuration of the spindle motor 100, the terms “upper” and “lower” will be described in correspondence with the vertical direction in FIG. 1 unless otherwise specified.

  The rotor 10 rotates about the axis A with respect to the stator 20 and includes a shaft 11, a rotor hub 12, and a magnet 13.

  The shaft 11 is a rotation axis of the rotor 10 and is formed in a substantially cylindrical shape along the axis A. The shaft 11 is supported by the sleeve 30 so as to be rotatable about the axis A via a bearing mechanism (not shown) using fluid dynamic pressure.

  The rotor hub 12 holds the magnet 13 and is formed in a bottomed cylindrical shape that opens downward. The rotor hub 12 is made of, for example, stainless steel. The shaft 11 is fixed to the central portion of the rotor hub 12 by a technique such as press fitting or adhesion. Thereby, the rotor hub 12 rotates together with the shaft 11. A magnet 13 is fixed to the inner peripheral surface of the rotor hub 12.

  The magnet 13 is formed in an annular shape around the axis A, and has a structure in which N and S poles are alternately magnetized along the circumferential direction.

The stator 20 includes a core 21 and a coil 22 wound around the core 21.
The core 21 is configured by laminating a plurality of plate-like magnetic materials in the vertical direction. The core 21 is formed in a substantially annular shape with the axis A as the center, and has a plurality of comb teeth arranged along the circumferential direction and protruding in the outer diameter direction. The core 21 is fixed to the base portion 50 and is disposed at a position facing the inner peripheral surface of the magnet 13 with a gap.

A coil 22 is wound around the core 21 by a three-phase winding. Specifically, as shown in FIG. 3, the coil 22 circulates from the fifth slot in the drawing to the right side in the order of U, W, and V phases so that the coils are wound around the comb teeth. 21 is wound around.
As will be described later, the ends of the coil 22 constitute four lead lines L drawn to the lower side of the base portion 50. Specifically, from the start and end of winding of the coil 22, three wires L1 to L3 corresponding to each of the U, V, and W phases and one common line L4 are drawn, so that a total of four wires are drawn. The leader line L is drawn. The common line L4 is configured by twisting the opposite side of the lead ends of the three wires L1 to L3 corresponding to the U, W, and V phases, and can be regarded as one lead line. .
Hereinafter, among the lead lines other than the common line L4, the line corresponding to the U phase is the first line L1, the line corresponding to the V phase is the second line L2, and the line corresponding to the W phase is the third line L3. Call it.

  FIG. 3 shows an example of the winding method of the coil 22 when the core 21 has nine comb teeth. In the figure, among the nine slots between the comb teeth, the first wiring L1 and the common line L4 are drawn from the fifth slot, the third wiring L3 is drawn from the sixth slot, and the second wiring L2 is drawn from the seventh slot. This is an example. This example is merely an example, and the winding method of the coil 22 is not limited to this.

  Returning to FIG. 1, the sleeve 30 is formed in a substantially cylindrical shape centering on the axis A, and supports the shaft 11 in a rotatable manner therein.

  The magnetic attraction plate 40 is made of a magnetic material and is located below the magnet 13. The magnetic attraction plate 40 generates a magnetic attraction force that attracts the magnet 13 in order to stabilize the floating position of the rotor 10.

The base part 50 fixes and holds the stator 20 and the magnetic suction plate 40 on the upper side. As shown in FIG. 1, a resin shim S is provided on a portion of the upper surface of the base portion 50 that faces the portion of the stator 20 from which the lead line L is drawn. By providing the shim S in this way, the lead line L is prevented from coming into direct contact with the base part 50, and insulation between the lead line L and the base part 50 is ensured. Further, the shim S is formed with holes at the same position as each of a plurality of drawer holes H described later.
The base portion 50 is made of, for example, an aluminum alloy and is configured as a part of the housing of the hard disk drive device. The base portion 50 is formed so as to face the rotor hub 12 in the vertical direction and to expand in the radial direction with the axis A as the center.

  In the base portion 50, a sleeve attachment hole 50a to which the sleeve 30 is attached is formed. The sleeve mounting hole 50a penetrates the base portion 50 from the bottom surface 51 (lower surface) in the axis A direction. The lower end portion of the sleeve 30 is inserted into the sleeve mounting hole 50a and fixed by means such as an adhesive. The counter plate 31 is fixed to the lower end surface of the sleeve 30 by a predetermined method, whereby the lower end side of the sleeve 30 is closed.

  The base portion 50 is formed with a recess 52 that is recessed upward from the bottom surface 51. The concave portion 52 is formed in the base portion 50 in order to secure a space for arranging the circuit board 60. The circuit board 60 is fixed in the recess 52 with an adhesive. The recess 52 will be described later.

The circuit board 60 is made of, for example, FPC (Flexible Printed Circuits), and is electrically connected to the coil 22 as described later. A drive current is supplied to the coil 22 from a drive circuit (not shown) via the circuit board 60. When a drive current is supplied to the coil 22, an interaction occurs between the magnetic poles of the stator 20 (comprised of the comb teeth of the core 21 and the coil 22) and the magnetic poles of the magnet 13, and the rotor 10 with respect to the stator 20 Rotates. In this way, the spindle motor 100 operates.
For example, in a hard disk drive, a magnetic disk is fixed to the rotor hub 12 of the spindle motor 100 by a predetermined method, and the magnetic disk is rotated by the power of the spindle motor 100.

  From here, the structure of the recessed part 52 provided in the base part 50 and the circuit board 60, and the connection structure of the coil 22 to the circuit board 60 are demonstrated.

  As shown in FIG. 2, the circuit board 60 includes a substantially rectangular main body portion 61, an extending portion 62 extending from the main body portion 61 toward the sleeve mounting hole 50 a, and a pad formed on the distal end side of the extending portion 62. Part 63. The pad forming portion 63 is formed along the circumferential direction around the axis A, and has a pad portion 630 that is a connection portion with the lead line L of the coil 22. The circuit board 60 has a configuration in which the upper and lower surfaces of the conductive layer are covered with an insulating layer. Among them, a part of the lower insulating layer in the pad forming portion 63 is removed to expose the conductive layer. The portion becomes the pad portion 630.

Four pad portions 630 are provided corresponding to each of the four lead lines L of the coil 22. The four pad portions 630 are a first pad portion 631 that is a connection destination of the first wiring L1, a second pad portion 632 that is a connection destination of the second wiring L2, and a third connection destination of the third wiring L3. A pad portion 633 and a common pad portion 634 to which the common line L4 is connected are configured.
As shown in FIG. 2, each pad portion 630 is a substantially rectangular portion located at the leading end portion (tip end on the axis A side) of the printed wiring formed on the circuit substrate 60, and as described above, This is a portion where 60 insulating layers have been removed. Note that the shape of each pad portion 630 and the wiring formed on the circuit board 60 shown in FIG. 2 is merely an example, and is not limited to the shape of the illustrated example (FIGS. 5 and 6 described later). The same applies to the above).

  As shown in FIG. 2, the concave portion 52 of the base portion 50 is formed to be slightly larger than the outer shape of the circuit board 60, and is provided with an accommodating portion 520 that accommodates the pad forming portion 63 and a main body portion 61. The connecting portion 521 accommodates the extending portion 62 and communicates with the accommodating portion 520 and the disposing portion 521.

  The accommodating portion 520 is formed in a fan shape along an arc centered on the axis A. The pad forming part 63 of the circuit board 60 has a fan shape that is slightly smaller than the accommodating part 520 and is accommodated in the accommodating part 520. The depth of the accommodating portion 520 is preferably larger than the sum of the thickness of the circuit board 60 and the thickness of solder formed as described later.

The inner diameter side of the accommodating portion 520 centered on the axis A is an area that is not covered by the pad forming portion 63, and the lead wire L of the coil 22 is drawn out of the base portion 50 in this area. For this purpose, a lead-out hole H is formed.
In the spindle motor 100 according to the first embodiment, the tip end portion (end portion on the axis A side) of the pad forming portion 63 of the circuit board 60 slightly covers the lead hole H as shown in FIG. ing. In this way, the lead line L drawn from the lead hole H is prevented from coming into direct contact with the base portion 50.

The extraction holes H are holes that allow the upper surface of the base portion 50 to communicate with the accommodating portion 520, and three are formed in the base portion 50. Of the three extraction holes H, one is a common extraction hole H1 from which the common line L4 and the first wiring L1 are extracted, and the other two are a dedicated extraction hole H2 from which the second wiring L2 is extracted. This is a dedicated extraction hole H3 from which the third wiring L3 is extracted. That is, one wiring is drawn out from each of the dedicated drawing holes H2 and H3.
If it corresponds to the example of FIG. 3, among the slots formed between the comb teeth of the core 21, the first wiring L1 and the common line L4 drawn from the fifth slot are both inserted into the common drawing hole H1, The third wiring L3 drawn from the sixth slot is inserted into the dedicated drawing hole H3, and the second wiring L2 drawn from the seventh slot is inserted into the dedicated drawing hole H2.

  In addition, although the hole diameter of each extraction hole H is arbitrary, it is preferable that it is a minimum required size from a viewpoint of suppressing the fall of the rigidity of the base part 50. FIG. Further, considering that two wires are drawn out from the common drawing hole H1, the common drawing hole H1 can be formed to have a larger diameter than the dedicated drawing holes H2 and H3.

As shown in FIG. 2, the three extraction holes H are arranged substantially along an arc centered on the axis A. Specifically, the holes are arranged in the order of the dedicated drawing hole H2, the dedicated drawing hole H3, and the common drawing hole H1 from the upper side in FIG.
The four pad portions 630 described above are also arranged substantially along an arc centered on the axis A. Specifically, these are arranged in the order of the second pad portion 632, the third pad portion 633, the common pad portion 634, and the first pad portion 631 from the upper side in FIG.

  In addition, it is preferable that the distance between each extraction hole H and the corresponding pad part 630 be as close as possible by forming each extraction hole H close to the pad forming part 63 of the circuit board 60. By doing so, the end of the housing portion 520 on the axis A side and the tip of the pad forming portion 63 can be brought closer to each other, so that the housing portion 520 can be formed smaller and the rigidity of the base portion 50 can be reduced. The decrease can be suppressed. On the other hand, it is preferable to maintain an appropriate distance between adjacent pads 630 in consideration of a soldering operation described later. The same applies to spindle motors 200 and 300 according to second and third embodiments described later.

The shared lead-out hole H1 is provided at a position where the distance from the common pad portion 634 and the distance from the first pad portion 631 are substantially the same.
By doing in this way, the length to the 1st pad part 631 of the 1st wiring L1 drawn out from the common extraction hole H1, and the length to the common pad part 634 of the common line L4 drawn out from the common extraction hole H1 Since the lengths can be kept substantially the same, either wiring is not too long.
Further, as will be described later in the soldering process, when both the first wiring L1 and the common line L4 are pulled out from the common extraction hole H1 using a jig (not shown), the common extraction hole is thus formed. If the distance from H1 to both pad portions is substantially the same, the amount of movement when the first wiring L1 and the common line L4 are pulled out can be made substantially the same, and wiring connection work is easy.
Note that the common pad portion 634 and the first pad portion 631 are arranged at a predetermined interval in the circumferential direction around the common extraction hole H1 in order to facilitate the soldering operation described later. Is preferred.

  The lead lines L drawn from the lead holes H are electrically connected to the circuit board 60 by being soldered to the corresponding pad portions 630. Each lead line L is provided with an insulating film covering the conductive wire, but the conductive wire portion is soldered to the pad portion 630 after the insulating film at the tip is removed.

Here, the soldering process of each leader line L will be described.
First, the leading end portion of each lead wire L is immersed in the solder bath, so that the insulating film on the leading end portion is melted to expose the conducting wire.
Subsequently, each lead line L is passed through the corresponding lead hole H. Specifically, both the common line L4 and the first wiring L1 are passed through the common lead hole H1, the second wiring L2 is passed through the dedicated lead hole H2, and the third wiring L3 is passed through the dedicated lead hole H3. Insulation treatment may be applied to the inner periphery of each extraction hole H.
Subsequently, while holding the lead line L drawn from each lead hole H with a jig (not shown), the jig is moved diagonally downward to the left in FIG. It is located in the vicinity of the corresponding pad portion 630.
Then, soldering is performed. Specifically, the first wiring L1 is connected to the first pad portion 631 by soldering, and the common line L4 is connected to the common pad portion 634 by soldering. The second wiring L2 is connected to the second pad portion 632 by soldering, and the third wiring L3 is connected to the third pad portion 633 by soldering. In this way, the circuit board 60 is electrically connected to the coil 22.

  In the first embodiment, solder is applied to the first formation region S1 shown in FIG. The first formation region S1 is a region that covers the tip of the predetermined lead line L and the pad portion 630 corresponding to the lead line L, and a region that does not cover the lead hole H corresponding to the lead line L. is there.

  As described above, after each lead wire L is soldered to the corresponding pad portion 630, each lead hole H is sealed with an adhesive. As the adhesive, a thermosetting adhesive, a photocurable (for example, an ultraviolet curable) adhesive, an anaerobic adhesive, or the like can be used. The adhesive is applied to at least a region that covers the solder location (first formation region S1) and the extraction hole H at a time. Note that the adhesive may be applied so as to cover the four pad portions 630 while simultaneously sealing the three extraction holes H by applying the adhesive over the entire pad forming portion 63. In this way, by sealing each lead-out hole H, airtightness in the spindle motor 100 can be improved and each lead-out line L can be fixed.

In the spindle motor 100 according to the first embodiment described above, the base portion 50 is provided with the lead hole H through which the four lead wires L of the coil 22 are passed from the upper side to the lower side. There are three lead holes H, one of which is a common lead hole H1 through which the common line L4 and the first wiring L1 are drawn out, and the other is a lead line other than the common line L4 and the first wiring L1. Dedicated extraction holes H2 and H3 from which (second wiring L2 and third wiring L3) are drawn one by one.
The common line L4 and the first wiring L1 are both drawn out from the common extraction hole H1, but the common line L4 is configured by twisting three wirings, so that it is a terminal of the first wiring L1. Easy to identify. Needless to say, since one lead line is drawn for each hole from the other holes (dedicated lead holes H2 and H3), each terminal can be easily identified. Moreover, since the number of the extraction holes H provided in the base part 50 can be reduced by one as compared with the case where the extraction holes H are provided by the number of the extraction lines L, it is possible to suppress a decrease in the rigidity of the base part 50.

A circuit board 60 having a pad portion 630 connected to the four lead lines L is provided below the base portion 50, and the base portion 50 is recessed upward and accommodates the pad portion 630. 520 and a lead-out hole H is formed in the accommodating portion 520.
Thus, by reducing the number of lead-out holes H provided in the storage part 520 from the number of lead lines L, the storage part 520 can be made small. If the accommodating part 520 becomes small, since the recessed part 52 formed in the base part 50 can also be made small, the fall of the rigidity of the base part 50 can be suppressed.

Also, the pad portion 630 is provided corresponding to each of the four lead lines L, of which the common pad portion 634 is connected to the common line L4 and is drawn out from the common lead hole H1 together with the common line L4. The first lead portion 631 is connected to the lead wire (first wire L1) to be connected, and the common lead hole H1 has a distance from the common pad portion 634 and a distance from the first pad portion 631 approximately. It is provided at the same position. The first pad portion 631 is an example of a terminal pad portion in the claims.
By doing in this way, the connection operation of wiring can be made easy as mentioned above.

  Note that PCs (Personal Computers) equipped with a hard disk drive suitable for the use of the spindle motor 100 have been increasingly mobile in recent years, and it is desired that the hard disk drive itself be configured to be thin. Then, it is desirable that the base portion 50 of the spindle motor 100 is formed as thin as possible while suppressing a decrease in rigidity. According to the spindle motor 100 described above, even if the base portion 50 is formed thin in consideration of such a request, as described above, it is possible to satisfactorily suppress a decrease in rigidity of the base portion 50.

Not only the example shown by 1st Embodiment demonstrated above but the drawer hole H provided in the accommodating part 520 of the base part 50 can be variously arrange | positioned.
From here, the spindle motors 200 and 300 according to the second and third embodiments, which are different from the spindle motor 100 according to the first embodiment in the form and arrangement of the extraction holes H, will be described. In the following, differences from the spindle motor 100 according to the first embodiment will be mainly described, and each part having the same functions as those of the spindle motor 100 according to the first embodiment will be described. The same reference numerals as those in FIG.

(Second Embodiment)
FIG. 5 shows a bottom view of the main part of the spindle motor 200 according to the second embodiment. This spindle motor 200 is different from the first embodiment in the configuration of the extraction hole H.

In the spindle motor 200 according to the second embodiment, each extraction hole H is formed through the pad forming portion 63 of the circuit board 60. That is, each extraction hole H communicates a through hole formed in the accommodating portion 520 of the base portion 50 with the lower surface of the through hole and the pad forming portion 63, and a communication hole formed in the pad forming portion 63. Is composed of.
In particular, the dedicated extraction hole H2 is provided through the accommodating portion 520 and the second pad portion 632, and the dedicated extraction hole H3 is provided through the accommodating portion 520 and the third pad portion 633. The second pad portion 632 and the third pad portion 633 are examples of dedicated pad portions.

In the spindle motor 200 according to the second embodiment, each of the second wiring L2 and the third wiring L3 is soldered according to the second formation region S2 shown in FIG. The second formation region S2 includes a predetermined lead hole H penetrating the accommodating portion 520 and the predetermined pad portion 630, a lead line L drawn from the lead hole H, and a pad portion 630 corresponding to the lead line L. It is an area that covers Specifically, the second wiring L2 and the second pad portion 632 drawn out from the dedicated drawing hole H2 penetrating the housing portion 520 and the second pad portion 632 are connected to the dedicated drawing hole H2 from the lower surface side of the circuit board 60. Soldered in a covered state. Further, the third wiring L3 and the third pad portion 633 drawn out from the dedicated extraction hole H3 penetrating the housing portion 520 and the third pad portion 633 cover the dedicated extraction hole H3 from the lower surface side of the circuit board 60. It is soldered with.
By doing so, the second wiring L2 and the second pad portion 632 are connected by soldering, the third wiring L3 and the third pad portion 633 are connected, and the circuit boards of the dedicated extraction holes H2 and H3 are connected. Since the opening on the 60 side (that is, a hole provided in the second pad portion 632 and the third pad portion 633) can be sealed, the sealing work is facilitated.
As shown in FIG. 5, each of the first wiring L <b> 1 and the common line L <b> 4 led out from the common lead hole H <b> 1 that penetrates the accommodating portion 520 and the pad forming portion 63 is similar to the first embodiment. Solder is applied in accordance with the first formation region S1 shown in FIG. As a result, the first wiring L1 and the first pad portion 631 are connected, and the common line L4 and the common pad portion 634 are connected.
As described above, in the spindle motor 200 according to the second embodiment, the dedicated lead hole H2 is formed so as to penetrate the second pad portion 632 to which the second wiring L2 is connected. The length of the part drawn out from the dedicated drawing hole H2 can be shortened. Thereby, disconnection of the 2nd wiring L2 under the base part 50 can be prevented. Similarly, in the spindle motor 200 according to the second embodiment, the dedicated lead hole H3 is formed through the third pad portion 633, which is the connection destination of the third wiring L3, and therefore the dedicated wiring for the third wiring L3. The length of the part drawn out from the drawing hole H3 can be shortened. Thereby, disconnection of the 3rd wiring L3 under the base part 50 can also be prevented.
The dedicated lead holes H2 and H3 are sealed by applying solder in the second formation region S2 in this way, but further cover these solder locations, the circuit board 60, and the inner peripheral side of the housing portion 520. Thus, sealing may be made stronger by applying an adhesive.

In the second embodiment, the distance between at least one of the common pad portion 634 or the first pad portion 631 and the common extraction hole H1 is the distance between the exclusive extraction hole H2 and the second pad portion 632 and the exclusive extraction hole. Each extraction hole H is disposed so as to be longer than the distance between H3 and the third pad portion 633. The first pad portion 631 is an example of a terminal pad portion in the claims.
Also in the second embodiment, each of the common line L4, the common pad portion 634, the first wiring L1, and the first pad portion 631 is soldered according to the first formation region S1 shown in FIG. However, the soldering operation is facilitated by securing the distance of the common drawing hole H1 in this way.
In addition, the common extraction hole H1 is sealed with an adhesive as in the first embodiment.

(Third embodiment)
FIG. 6 shows a bottom view of the main part of the spindle motor 300 according to the third embodiment. This spindle motor 300 is similar to the spindle motor 200 according to the second embodiment in that each extraction hole H is formed through the pad forming portion 63 and the accommodating portion 520. The arrangement is different.

Specifically, also in the spindle motor 300 according to the third embodiment, each extraction hole H includes a through hole formed in the accommodating portion 520 of the base portion 50, and the through hole and the lower surface of the pad forming portion 63. And a communication hole formed in the pad forming portion 63. Moreover, as shown in FIG. 6, each pad part 630 is arranged along the substantially circumferential direction centering on the axis line A, and each extraction hole H is also arranged along the circumferential direction.
Since the extraction holes H are arranged in this way, the accommodating portion 520 and the pad forming portion 63 accommodated therein can be formed narrower (smaller) in the radial direction around the axis A. Therefore, a decrease in the rigidity of the base portion 50 can be reduced more favorably. Moreover, if the accommodating part 520 can be made small, the circuit board 60 can also be made small.
In addition, in order to arrange each pad part 630 and each extraction hole H compactly below the stator 20, it is preferable that they are arranged along a substantially circumferential direction centering on the axis A as described above. You may arrange in.

As shown in FIG. 6, each extraction hole H and each pad portion 630 are, from the upper side in the drawing, a second pad portion 632, a dedicated extraction hole H 2, a third pad portion 633, a dedicated extraction hole H 3, and a common pad The parts 634, the common extraction holes H1, and the first pad parts 631 are arranged in this order.
Thus, by arranging the lead-out holes H and the pad portions 630 alternately, it is possible to secure the spacing between the lead-out holes H adjacent to each other. Confusion of L terminal types can also be suppressed.
The arrangement of the extraction holes H is not limited to this. For example, the positions of the dedicated extraction holes H3 and the third pad portion 633 in FIG. 6 may be reversed. In this way, since the space between the second pad portion 632 and the third pad portion 633 can be increased, the soldering operation is facilitated. However, the common extraction hole H1 is preferably formed between the common pad portion 634 and the first pad portion 631. If this is not done, the common line L4 and the first wiring L1 will be drawn out in substantially the same direction, and the drawing-out work and soldering work of the lead-out line L will be complicated.

Although the spindle motor 300 according to the third embodiment is different from the spindle motor 100 according to the first embodiment in the configuration of the lead-out holes H, the form of solder is common.
That is, in the spindle motor 300 according to the third embodiment, the common line L4 and the common pad portion 634, and the first wiring L1 and the first pad portion 631 are formed in the first formation region S1 shown in FIG. Soldering is performed according to The second wiring L2 and the second pad portion 632, and the third wiring L3 and the third pad portion 633 are also soldered according to the first formation region S1.
In the spindle motor 300 according to the third embodiment, the extraction holes H2 and H3 are formed so as to penetrate through regions other than the second and third pad portions 632 and 633 in the pad forming portion 63. This is different from the spindle motor 200 according to the second embodiment.
Although not shown in the drawings, as a modification of the spindle motor 300 according to the third embodiment, as in the spindle motor 200 according to the second embodiment, the dedicated extraction hole H2 passes through the housing portion 520 and the second pad portion 632. The dedicated extraction hole H3 may be provided so as to penetrate the housing portion 520 and the third pad portion 633. In this case as well, like the spindle motor 200 according to the second embodiment, each of the second wiring L2 and the third wiring L3 may be soldered according to the second formation region S2 shown in FIG. According to this modified example, as described above, the accommodating portion 520 and the pad forming portion 63 accommodated therein can be formed narrowly (smallly) in the radial direction around the axis A, and the second As described in the embodiment, the lengths of the portions of the second and third wirings L2 and L3 that are led out from the dedicated lead-out holes H2 and H3 can be shortened. Disconnection of the three wirings L2 and L3 can be prevented.

  The present invention is not limited to the above embodiment. It is possible to change the configuration as appropriate (including deletion of components) without departing from the scope of the present invention.

  In the first to third embodiments, the example in which the lead line L drawn from the common lead hole H1 together with the common line L4 is the first wiring L1 corresponding to the U phase is shown, but the present invention is not limited thereto. The lead line L drawn from the common lead hole H1 together with the common line L4 may be the second wiring L2 corresponding to the V phase or the third wiring L3 corresponding to the W phase.

  Further, the arrangement of the extraction holes H and the pad portions 630 is also arbitrary depending on the purpose. For example, in the example shown in FIGS. 2, 5, and 6, among the three extraction holes H, the common extraction hole H <b> 1 is formed on the lowermost side in each drawing, but is formed on the upper side or the middle. May be.

  The circuit board 60 is preferably a flexible FPC, but may be a hard printed circuit board.

  The spindle motors 100, 200, and 300 described above are suitable for a three-phase motor, but may be a four-phase or more motor. Further, the present invention can be applied not only to the outer rotor type but also to an inner rotor type, a surface facing type motor, and the like. Also in these various motors, the number of the extraction holes H formed in the base portion 50 can be reduced by pulling out the common line L4 and a predetermined type of terminal from the common extraction hole H1, and the rigidity of the base portion 50 can be reduced. Can keep.

  Further, the spindle motors 100, 200, and 300 are not limited to the use of the HDD, but can be applied to various uses such as a DVD disk rotation.

  In the above description, in order to facilitate understanding of the present invention, descriptions of known technical matters are omitted as appropriate.

DESCRIPTION OF SYMBOLS 100,200,300 ... Spindle motor 10 ... Rotor 11 ... Shaft 12 ... Rotor hub 13 ... Magnet 20 ... Stator 21 ... Core 22 ... Coil L ... Lead wire (L1-L3 ... 1st-3rd wiring, L4 ... Common wire)
50 ... Base 51 ... Bottom 52 ... Recess 520 ... Housing H ... Drawer hole (H1 ... Common drawer hole, H2, H3 ... Dedicated drawer hole)
60 ... Circuit board 63 ... Pad formation part 630 ... Pad part (631-633 ... 1st-3rd pad part, 634 ... Common pad part)

Claims (8)

A base part;
A stator located on one side of the base portion and having a coil;
A rotor positioned on the one side of the base portion and rotating with respect to the stator;
The base portion is provided with a plurality of lead holes through which the lead wires of the coil pass from the one side to the other side,
The plurality of lead lines include one common line,
Of the plurality of lead holes, one is a common lead hole through which two lead lines including the common line are led out together, and the other lead lines other than the two lead lines are led out one by one. Is a dedicated drawer hole,
A spindle motor characterized by that. A circuit board having a plurality of pad portions connecting each of the plurality of lead lines is provided on the other side of the base portion,
The base portion is recessed toward the one side, and has a storage portion for storing the pad portion.
The extraction hole is formed in the accommodating portion,
The spindle motor according to claim 1. The pad portion is provided corresponding to each of the plurality of lead lines, of which a portion connected to the common line is a common pad portion, and a lead line led out from the common lead hole together with the common line; What is connected to the terminal pad part, and what is connected to the lead line drawn from the dedicated lead hole is the dedicated pad part,
The distance between at least one of the common pad portion or the terminal pad portion and the common extraction hole is longer than the distance between the dedicated pad portion and the exclusive extraction hole.
The spindle motor according to claim 2. The pad portion is provided corresponding to each of the plurality of lead lines, of which a portion connected to the common line is a common pad portion, and a lead line led out from the common lead hole together with the common line; If the connected pad is the terminal pad,
The common extraction hole is provided at a position where the distance from the common pad portion and the distance from the terminal pad portion are substantially the same.
The spindle motor according to claim 2 or 3, wherein The pad portion is provided corresponding to each of the plurality of lead lines, and of those connected to the lead line led out from the dedicated lead hole is a dedicated pad portion,
The dedicated extraction hole is provided through the accommodating portion and the dedicated pad portion,
The lead wire drawn out from the dedicated lead hole and the dedicated pad portion are soldered in a state of covering the dedicated lead hole,
The spindle motor according to any one of claims 2 to 4, wherein the spindle motor is provided. The pad portion is provided corresponding to each of the plurality of lead lines,
The extraction hole is provided through the housing portion and the circuit board,
The pad portion and the extraction hole are arranged along a predetermined direction,
The spindle motor according to any one of claims 2 to 5, wherein: The predetermined direction is a substantially circumferential direction around the rotation axis of the rotor,
The spindle motor according to claim 6.   The diameter of the common extraction hole is larger than the diameter of the dedicated extraction hole,
  The spindle motor according to claim 1, wherein the spindle motor is a motor.