JP2008054411A - Motor and recording medium drive unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve reduction in thickness, and to improve the efficiency of magnetomotive force and heat dissipation performance. <P>SOLUTION: There is provided a motor which comprises: a ring-shaped part 7a arranged so as to surround permanent magnets; a plurality of tooth poles 7b fixed to the ring-shaped part at their base ends; a stator core 7 having tips 7c formed at tips of the tooth poles; a board body 11; a ring 12 which is formed so as to be overlapped with the tips of the plurality of tooth poles; a plurality of connecting parts 13 which are connected to the board body and the ring at their both ends, and formed so as to be overlapped with the plurality of tooth poles; and conductor patterns 14. The motor also comprises a flexible board 8 which is arranged so as to be overlapped with the stator core, and functions as a coil for exciting the tooth poles in such a manner that the tooth poles are spirally wound around with portions which are patterned on the tooth poles, when the tooth poles are wound around with the connecting parts. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a motor that rotationally drives a recording medium such as an HD (hard disk) and a recording medium driving apparatus having the motor.

In recent years, an information recording / reproducing apparatus using a hard disk drive (HDD) has begun to be adopted in a portable music reproducing apparatus, a mobile phone, and the like. In particular, portable information recording / reproducing devices will become the mainstream in the future due to their convenience, and further miniaturization and thinning are required. Along with this, improvements in miniaturization and thinning of motors for driving HD (hard disks) have been made.
Here, a disk drive device having a general motor will be briefly described with reference to FIGS. As shown in FIG. 13, the disk drive device 40 includes a stator portion 43 having a coil 41 and a stator core 42, and a rotor portion 46 having a permanent magnet 44 and a hub 45. The hub 45 is supported by the sleeve 47 so as to be rotatable around the axis L, and a fitting portion 45a that fits into the center hole of the disk D is formed at the upper end. As a result, the disk D is fixed to the hub 45. A permanent magnet 44 is fixed to the outer periphery of the hub 45 so as to face the stator core 42 with a predetermined distance.

  The sleeve 47 is fixed to the base 48 and rotatably supports the hub 45. At this time, a slight gap is secured between the sleeve 47 and the hub 45, and oil W is filled in the gap. On the outer surface of the hub 45, a radial dynamic pressure generating groove and a thrust dynamic pressure generating groove, not shown, called herringbone grooves are appropriately formed. As a result, when the hub 45 rotates around the axis L, the hub 45 rotates stably without shaking in the thrust direction and the radial direction. That is, the hub 45 is supported by the fluid dynamic pressure bearing.

  As shown in FIG. 14, the stator core 42 includes a core back 42 a formed in an annular shape, and a plurality of tooth poles formed to extend in the radial direction while being fixed to the core back 42 a at the base end side. Part (teeth) 42b. The stator core 42 is supported by the base 48 on the core back 42a side. The tooth pole portions 42b are formed around the axis L at every predetermined angle, and are formed so that the number (the number of slots) is a multiple of three. For example, only 9 slots are formed every 40 degrees. The coils 41 are wound around the plurality of tooth pole portions 42b. At this time, it is wound every third (with two spaces between them) so as to have three phases (U phase, V phase, W phase).

  When the disk D is driven by the disk drive device 40 configured as described above, first, a three-phase alternating current is supplied to the coil 41 to generate a magnetic field in the coil 41. This magnetic field acts on the permanent magnet 44 via the tooth pole portion 42b to rotate the rotor around the axis L. Thereby, the disk D fixed to the rotor part 46 by the fitting part 45a can be rotated.

  Incidentally, as described above, motors are required to be further reduced in size and thickness for the future. However, as shown in FIG. 15, the coil 41 is wound around the tooth pole portion 42b by a predetermined number of turns in order to ensure a constant magnetomotive force, so that the thickness T1 is inevitably increased. It was. For this reason, it has been difficult to reduce the overall thickness. In particular, the thickness T1 of the coil 41 is significant as compared with other components, and thus greatly affects the thickness reduction. For this reason, the coil 41 needs to be as thin as possible in order to reduce the thickness. However, since a predetermined number of turns is necessary to secure a constant magnetomotive force as described above, the number of turns of the coil 41 cannot simply be reduced.

  Therefore, a method of increasing the number of tooth pole portions 42b (number of slots) and reducing the number of turns of the coil 41 wound around one tooth pole portion 42b is conceivable. In this case, as shown in FIG. As the number increases, the distance T2 between the tooth pole portions 42b becomes smaller. Here, in order to wind the coil 41 wire around the tooth pole portion 42b, a normal winding machine is inserted between the tooth pole portions 42b, and the coil wire is wound around the tooth pole portion 42b. Yes. For this reason, if the distance T2 between the tooth pole portions 42b is made smaller than the specified value, the winding machine cannot pass and the coil wire cannot be wound. Therefore, the number of slots cannot be increased to the required number, and the number is limited. Therefore, it is difficult to reduce the thickness T1 by extremely reducing the number of turns of the coil 41 in one tooth pole portion 42b as the overall thickness is reduced.

On the other hand, there is known a disk drive device in which a stator is configured without mechanically winding a coil wire and the overall thickness is reduced (see, for example, Patent Documents 1 and 2).
As shown in FIGS. 16 and 17, the disk drive device 50 includes a metal core substrate 51 having the functions of a motor core and windings and a wiring substrate on which components such as an IC are mounted. The metal core substrate 51 constitutes a stator, and includes a tooth connecting portion, a tooth coil forming portion 51a, a tooth tip portion 51b, a wiring 51c, and a through hole 51d (not shown).

  The teeth connecting portion is a thin laminated plate and is formed in an annular shape. The teeth coil forming portion 51a is a portion that is fixed at the base end side to the tooth connecting portion and extends radially inward, and corresponds to a conventional magnetic pole tooth. Usually, the teeth coil forming portion 51a is formed to be 1.5 times the number of poles of the annular permanent magnet 52 formed. Further, the tip of the tooth coil forming portion 51 a is a teeth tip portion 51 b, and faces the permanent magnet 52.

  The wiring 51 c is disposed on the front and back surfaces of the tooth coil forming portion 51 a and is fixed by an insulating resin 53. The insulating resin 53 has a through hole 51d whose inner surface is plated with metal, and electrically connects the wiring 51c formed on the front surface and the back surface. At this time, as shown in FIG. 17, the wiring 51c and the through hole 51d are connected so as to surround the teeth coil forming portion 51a in a spiral shape. Thereby, the magnetic field which rotates the permanent magnet 52 can be generated by sending an electric current through the wiring 51c.

According to the disk drive device 50 having the metal core substrate 51 configured as described above, the stator can be configured without mechanically winding the coil wire around the magnetic pole portion as in the prior art. It is possible to increase the number of teeth coil forming portions 51a, that is, the number of slots. Therefore, the number of wirings 51c wound around one tooth coil forming portion 51a can be reduced, and the thickness can be suppressed as much as possible. Therefore, the overall thickness can be reduced.
Japanese Patent Laid-Open No. 2004-23935 JP 2004-23936 A

However, the prior art described in Patent Documents 1 and 2 still have the following problems.
That is, since the insulating resin 53 is interposed between the tooth coil forming portion 51a and the wiring 51c, the total length is longer than that when the coil wire is wound. In addition, since the through hole 51d is drilled by machining or laser processing, the position of the through hole 51d is easily generated from the wiring 51c. For this reason, it is difficult to arrange the through holes 51d at a narrow interval, and the total length has become longer. As a result, there is a disadvantage that the resistance increases, the magnetomotive force efficiency is poor, and the power consumption increases.
In addition, since a part of the wiring 51c and the tooth coil forming portion 51a are embedded in the insulating resin 53, there is a possibility that the heat generated by energization is not released to the outside and spreads inside. It was. For this reason, the parts are likely to be peeled off due to heat, leading to a decrease in power performance and a decrease in reliability.
As described above, even if the thickness can be reduced, a new inconvenience occurs instead.

  The present invention has been made in view of such circumstances, and an object of the present invention is to reduce the thickness of the motor and to improve the efficiency of the magnetomotive force and the heat dissipation and the recording medium drive having the motor. Is to provide a device.

The present invention provides the following means in order to solve the above problems.
A motor according to the present invention includes a shaft body rotatably supported around an axis, an annular permanent magnet held by the shaft body, an annular portion arranged to surround the permanent magnet, A plurality of tooth pole portions each having a base end fixed to the annular portion and extending in a radial direction toward the permanent magnet and provided at a predetermined angle around the axis, and the plurality of tooth poles A stator core formed at the tip of each part and having a tip part facing the outer peripheral surface of the permanent magnet, a substrate body part having a through hole having a diameter substantially the same as the inner diameter of the annular part, and the inside of the through hole And a ring portion formed to overlap the tip portions of the plurality of tooth pole portions, and both ends are connected to the substrate body portion and the ring portion, and formed to overlap the plurality of tooth pole portions. A plurality of connecting portions; the substrate body portion; the ring portion; A conductive pattern patterned on each of the connecting portions, and an insulating flexible substrate disposed to be superposed on the stator core, the connecting portion surrounding the tooth pole portion. When the periphery of the tooth pole portion is surrounded by the connecting portion, the portion patterned on the tooth pole portion is spirally wound around the tooth pole portion. It functions as a coil that rotates to excite the tooth pole portion.

  In the motor according to the present invention, when a predetermined current is supplied to the conductor pattern of the flexible substrate, a part of the conductor pattern functions as a coil wound spirally around each tooth pole portion (tooth). Therefore, the tooth pole part is excited and a magnetic field is generated. By this magnetic field, the permanent magnet rotates about the axis together with the shaft body. At this time, the stator core has a tip portion facing the outer peripheral surface of the permanent magnet at the tip of the tooth pole portion, so that the magnetic flux between the stator core and the permanent magnet is densely transferred. Therefore, the shaft body can be efficiently rotated.

  Here, the assembly of the flexible substrate for causing a part of the conductor pattern to function as a coil will be described. First, a stator core and a flexible sheet-like flexible substrate are overlaid. At this time, since the through hole having a diameter substantially the same as the inner diameter of the annular portion of the stator core is formed in the substrate main body portion of the flexible substrate, the annular portion overlaps the substrate main body portion when they are overlapped. In addition, the plurality of tooth pole portions are in a state of overlapping each of the plurality of connecting portions whose one ends are connected to the flexible substrate. The connecting portion is not the same size as the lateral width of the tooth pole portion, but is formed wide so that the periphery of the tooth pole portion can be surrounded. Moreover, the front-end | tip part of several tooth-electrode part has been in the state which overlapped with the ring part connected to the board | substrate main-body part via several connection part.

  Then, after the stator core and the flexible substrate are overlaid, the connecting portions overlapping the plurality of tooth pole portions are bent and joined so as to wrap around the tooth pole portions. Thereby, the circumference | surroundings of a several tooth-pole part can be surrounded by a connection part. As a result, the conductor pattern patterned on the connecting portion is spirally wound around the tooth pole portion. Thereby, a part of conductor pattern can be functioned as a coil.

  As described above, by encircling the connecting portion of the flexible flexible substrate to the tooth pole portion, a part of the conductor pattern can be made to function as a coil. Unlike the case where the coil is formed by winding, there is no need to use a winding machine. Therefore, the stator core can be configured to increase the number of tooth pole portions, that is, the number of slots as much as possible. Therefore, the number of turns of the coil per tooth pole portion can be reduced, and the thickness can be suppressed as much as possible. Therefore, the overall thickness can be reduced.

In addition, since the conductor pattern is patterned on the connecting portion, the conductor pattern and the tooth pole portion can be brought as close as possible when the tooth pole portion is wrapped and surrounded by the connecting portion. Therefore, the length of the conductor pattern can be shortened as much as possible, and the electrical resistance can be suppressed as much as possible. Therefore, magnetomotive force can be generated efficiently, and wasteful power consumption can be eliminated.
Moreover, since one side of the stator core is exposed except for the tooth pole portion, the exposed area exposed to the atmosphere is larger than that of the conventional one. In addition, the flexible substrate is thinner and easier to pass heat than an insulating resin or the like. As a result, heat generated by energization can be efficiently radiated. Therefore, it is possible to suppress the occurrence of malfunctions and peeling of parts due to heat, and the reliability can be improved.
Furthermore, since there is no need to use a winding machine, the gap between adjacent tip portions can be made as small as possible. Therefore, part of the magnetic force lines flowing in the tooth pole part can be passed to the adjacent tooth pole part via the tip part, and the magnetic force attracting the permanent magnet and the tip part can be reduced. As a result, the cogging torque can be reduced and high performance can be achieved.

  Further, the motor according to the present invention is the motor according to the present invention, wherein an insulating film is formed on the entire surface of the stator core, and the flexible substrate is attached to the stator core in a state where the conductive pattern is in contact with the insulating film. They are arranged so as to be overlapped.

  In the motor according to the present invention, when assembling the flexible substrate, the flexible substrate and the stator core are overlapped so that the conductor pattern faces the stator core side. As a result, the conductor pattern is in contact with the tooth pole portion via the insulating film when the connecting portion surrounds and surrounds the tooth pole portion with the conductor pattern on the inner surface side. That is, no useless gap is left between the conductor pattern and the tooth pole portion. Therefore, after ensuring the insulation between the tooth pole portion and the conductor pattern, the length of the conductor pattern can be reduced to the necessary minimum length, and the electrical resistance can be further suppressed. Therefore, magnetomotive force can be generated more efficiently without reducing reliability, and power saving can be achieved.

  Further, the motor according to the present invention is the motor according to the present invention, wherein the plurality of tooth pole portions are formed by a multiple of 3, and the flexible substrate is a first flexible substrate, a second flexible substrate, and The third flexible substrate is composed of three substrates, and the first flexible substrate is overlapped with the tooth pole portion with a gap between two of the plurality of tooth pole portions. And the second flexible substrate is positioned at a position out of phase by one from the tooth pole portion surrounded by the connecting portion of the first flexible substrate among the plurality of tooth pole portions. The third flexible substrate is one of the plurality of tooth pole portions from the tooth pole portion surrounded by the connection portion of the second flexible substrate. Just out of phase And it is characterized in that it has the connecting portion so as to overlap with respect to tooth pole portion of the positions.

In the motor according to the present invention, the number of teeth pole portions of the stator core is a multiple of 3, for example, 9 slots or 18 slots. The flexible substrate is composed of three substrates, that is, a first flexible substrate, a second flexible substrate, and a third flexible substrate. At this time, the interval of the connecting portions of the first flexible substrate is adjusted so as to overlap the tooth pole portion with a gap between the two connecting portions. Further, the interval of the connecting portion of the second flexible substrate is adjusted so as to overlap the tooth pole portion where the phase is shifted by one slot from the tooth pole portion where the connecting portion of the first flexible substrate overlaps. . Further, the interval of the connecting portion of the third flexible substrate is adjusted so as to overlap the tooth pole portion where the phase is shifted by one slot from the tooth pole portion where the connecting portion of the second flexible substrate overlaps. .
Accordingly, when the three flexible substrates and the stator core are overlapped, the connecting portion of each flexible substrate does not overlap the connecting portion of another flexible substrate. Accordingly, the plurality of tooth pole portions can be reliably wrapped and surrounded by the connecting portions of the three flexible substrates.

  In particular, since three flexible substrates are configured and the connecting portions of the flexible substrates are alternately surrounded by the tooth pole portions, the three-phase alternating current can be supplied to rotate the shaft body. In other words, the three-phase alternating current with the conductor pattern of the first flexible substrate dedicated to the U phase, the conductor pattern of the second flexible substrate dedicated to the V phase, and the conductor pattern of the third flexible substrate dedicated to the W phase. Can be supplied. Thus, each flexible substrate can be a dedicated substrate for the U phase, V phase, and W phase, respectively, and therefore can be easily patterned without considering other phases when patterning the conductor pattern. . Therefore, manufacturing efficiency can be further increased. Further, when assembling the stator core, it is easy to route the wiring with respect to each flexible substrate.

  Further, the motor according to the present invention is the motor according to any one of the above-described aspects of the present invention, wherein the conductor pattern is electrically connected to the connecting portion and one electrically independent wiring is oblique to the radial direction of the stator core. In such a state, when the toothed pole portion is surrounded by the connecting portion, one end of the adjacent wiring and the other are patterned. The ends are electrically connected.

In the motor according to the present invention, patterning is performed so that a plurality of electrically independent wires are arranged in parallel in the radial direction on the connecting portion. At this time, the plurality of wirings are patterned in an oblique state with respect to the radial direction. Therefore, an electrical passage is not ensured at a stage before the connecting portion is bent.
Here, when the connection portion is bent to surround the periphery of the tooth pole portion, one end and the other end of the adjacent wiring are electrically connected one after another, so that an electrical path can be obtained. As a result, the conductor pattern patterned on the connecting portion can be spirally wound around the tooth pole portion and can function as a coil.

  Moreover, the motor according to the present invention is characterized in that, in the motor according to the present invention, the conductor pattern is patterned so that both ends of the wiring protrude outward from the connecting portion. .

  In the motor according to the present invention, since both ends of the plurality of wires arranged in parallel on the connecting portion are patterned so as to protrude outward from the connecting portion, the connecting portion is bent to form the tooth pole portion. When surrounding the periphery, the wiring can be connected first. Therefore, electrical connection can be performed more reliably and accurately, and the reliability can be further improved.

  Moreover, the motor according to the present invention is the motor according to any one of the above-described present invention, wherein the connecting portion is inserted in advance so that the tooth pole portion is inserted between the stator core and the flexible substrate. It is characterized by being molded into a U-shaped cross section.

  In the motor according to the present invention, since the connecting portion of the flexible substrate is previously molded in a U-shaped section with substantially the same width as the tooth pole portion, when the stator core and the flexible substrate are overlapped, each tooth pole portion Will naturally fit within the connection. Therefore, the connection portion can be wound around the tooth pole portion more easily and in a short time. Therefore, manufacturing efficiency can be further increased. Further, by increasing the number of slots, even when the gap between adjacent tooth pole portions is narrowed, the connecting portion can be easily inserted between the tooth pole portions, and assembly is facilitated.

  A recording medium driving apparatus according to the present invention includes any one of the motors according to the present invention, a holding unit that is provided in the shaft body and holds a recording medium capable of recording various information, and the shaft body is connected to the axis. And a bearing portion that is rotatably supported around.

  Since the recording medium driving device according to the present invention includes the thinned motor, the entire device can be thinned. In addition, since the magnetomotive force efficiency and heat dissipation are excellent and the motor is also improved, power consumption can be suppressed and quality can be improved.

According to the motor of the present invention, it is possible to reduce the thickness and improve the performance, and to increase the efficiency of the magnetomotive force and the heat dissipation. In particular, since a coil can be provided easily and in a short time without using a winding machine, the manufacturing efficiency can be improved and the cost can be reduced.
Further, according to the recording medium driving apparatus of the present invention, the entire apparatus can be reduced in thickness, and the quality can be improved while suppressing power consumption.

Hereinafter, an embodiment of a motor and a recording medium driving apparatus according to the present invention will be described with reference to FIGS.
As shown in FIG. 1, the recording medium driving apparatus 1 of the present embodiment includes a spindle motor (motor) 2 that rotates a hard disk (recording medium) D capable of recording various types of information around an axis L, and the spindle motor 2. And a fluid dynamic pressure bearing portion (bearing) that supports the hub 5 so as to be rotatable about the axis L. Part) 3.

  The spindle motor 2 includes a hub 5 rotatably supported around an axis L, an annular permanent magnet 6 held by the hub 5, and a stator core 7 disposed so as to surround the permanent magnet 6. , A flexible substrate 8 superimposed on the stator core 7 and a base 9 for supporting a core back (annular portion) 7a of the stator core 7 which will be described later.

  The hub 5 has a shaft portion 5a formed in a substantially cylindrical shape with the axis L as a center, and is formed to extend radially outward from the outer peripheral surface of the shaft portion 5a. And a flange portion 5b formed so as to be sandwiched therebetween. Further, the upper end of the hub 5 is inserted into the central hole of the hard disk D and serves as the fitting portion 5c for fitting and holding the hard disk D. Further, the permanent magnet 6 is held by the flange portion 5b. The permanent magnet 6 of the present embodiment is formed so that the cross-sectional area along the radial direction is rectangular, and the outer peripheral surface thereof is a surface parallel to the axis L.

  The fluid dynamic pressure bearing portion 3 is formed in a cup shape, and includes a sleeve 3 a having a base end fixed by a base 9, and an oil W supplied between the sleeve 3 a and the hub 5. The sleeve 3a is an accommodating part in which the inner side is formed in a circular shape and the shaft part 5a is accommodated. A flange 3b is formed at the upper end of the sleeve 3a so as to extend outward in the radial direction. In addition, a small gap is designed between the sleeve 3a and the hub 5, and oil W is supplied to the gap. The oil W is prevented from leaking to the permanent magnet 6 side by a seal (not shown).

Further, a plurality of thrust dynamic pressure generating grooves (not shown) called herringbone grooves are formed on the upper and lower outer surfaces of the flange portion 3b facing the flange portion 5b. Similarly, a plurality of radial dynamic pressure generating grooves called herringbone grooves (not shown) are formed on the outer surface of the flange portion 5b facing the outer peripheral surface of the sleeve 3a. As a result, when the hub 5 rotates, the oil W flows along the thrust dynamic pressure generating groove and the radial dynamic pressure generating groove to increase the pressure, and the hub 5 rotates stably.
That is, the thrust dynamic pressure generating groove and the radial dynamic pressure generating groove are part of the fluid dynamic pressure bearing portion 3.

The stator core 7 is formed by laminating (for example, laminating two layers) a magnetic body (silicon steel plate or the like) punched by a press or the like, and coating the surface with an insulating film (not shown). As shown, a core back 7a disposed so as to surround the periphery of the permanent magnet 6, a base end is fixed to the core back 7a, and the core back 7a is formed so as to extend in the radial direction toward the permanent magnet 6. A plurality of teeth (tooth portions) 7b provided at predetermined angles around the axis L, and tip portions 7c formed at the tips of the plurality of teeth 7b and facing the outer peripheral surface of the permanent magnet 6 are provided. ing. As described above, the stator core 7 is fixed in a state where the lower surface of the core back 7 a is placed on the stepped portion 9 a of the base 9.
In the present embodiment, a description will be given by taking as an example the stator core 7 in which the teeth 7b are formed in 18 pieces (formed every 20 degrees around the axis L), which is a multiple of three. That is, the case where the number of slots is 18 will be described as an example.

  As shown in FIG. 2, the flexible substrate 8 includes three substrates, a first flexible substrate 10, a second flexible substrate 20, and a third flexible substrate 30. On the other hand, they are arranged so as to be superposed. The three flexible substrates 10, 20, and 30 have the same basic configuration except that the position of the connecting portion 13 and the patterning of the conductor pattern 14 described later are different. First, the first flexible substrate 10 will be described.

  As shown in FIGS. 2 and 4, the first flexible substrate 10 includes a substrate main body portion 11, a ring portion 12, a connecting portion 13, and a conductor pattern 14. The substrate body 11 is formed in a rectangular shape when viewed from above, and a through hole 11a having a diameter substantially the same as the inner diameter of the core back 7a is formed at a substantially central position. And in this through-hole 11a, the ring part 12 formed so that it might overlap with the front-end | tip part 7c of 18 teeth 7b was formed. The ring portion 12 is connected to the substrate body portion 11 by a connecting portion 13 having both ends connected to the ring portion 12 and the substrate body portion 11. And these board | substrate main-body parts 11, the ring part 12, and the connection part 13 are integrally formed by the flexible base material (For example, films, such as a polyimide and a liquid crystal polymer, etc.).

  6 of the 18 teeth 7b are formed so as to overlap with the teeth 7b, and as shown in FIG. 5, the connecting portion 13 is formed with the conductor pattern 14 on the inner surface side. It is formed in a size that can surround the periphery of the. That is, each connecting portion 13 is designed to have a lateral width W2 that is approximately 2.5 times larger than the lateral width W1 (shown in FIG. 3) of the teeth 7b. A notch 11b is formed between each connecting portion 13, and the substrate body 11 and the ring portion 12, and the lateral width is once formed to be approximately the same size as the lateral width W1 of the tooth 7b. Thereby, each connecting part 13 is easily bent.

  As shown in FIG. 4, the conductor pattern 14 is formed by patterning a metal film such as copper on the substrate main body portion 11, the ring portion 12, and the connecting portion 13, and the connecting portion 13 causes the teeth 7 b to be formed. When the periphery is surrounded, a portion patterned on the connecting portion 13 functions as a coil for exciting the teeth 7b by spirally winding the periphery of the teeth 7b.

More specifically, the conductor pattern 14 is patterned from the external connection terminal 16a formed on the substrate body 11 to the first connecting portion 13, and then patterned to the ring portion 12 across the connecting portion 13. . At this time, as shown in FIG. 5, the conductor pattern 14 is formed so that one electrically independent wiring 15 on the connecting portion 13 is oblique to the radial direction of the stator core 7 (the arrow X direction shown in FIG. 5). In this state, they are patterned so as to be arranged in parallel at regular intervals in the radial direction X. That is, each wiring 15 is patterned so that the pitch is shifted by one step at both ends of the connecting portion 13. In this embodiment, a single wiring 15 is formed by patterning two thin wires 15a in parallel to form a closed circuit.
As described above, since the pitch of each wiring 15 is shifted by one stage, one end and the other end of adjacent wirings 15 are electrically connected. That is, as shown in FIG. 5, when the tooth 7b is surrounded by the connecting portion 13, one end P1 of the wiring 15 and the other end P2 of the adjacent wiring 15 are connected to each other. The conductor pattern 14 on the connecting portion 13 is patterned such that both ends P1 and P2 of each wiring 15 protrude outward from the connecting portion 13.

  And after the conductor pattern 14 which reached | attained on the ring part 12 across the first connection part 13 is patterned to the connection part 13 adjacent along this ring part 12, as shown in FIG.4 and FIG.5, Patterning is performed again up to the substrate main body 11 across the connecting portion 13. At this time, the patterning on the connecting portion 13 is the same as described above. The conductor pattern 14 reaching the substrate main body 11 is patterned to the adjacent connecting portion 13 and then patterned to the ring portion 12 across the connecting portion 13. As described above, the conductor pattern 14 passes through the six connecting portions 13 while alternately passing through the ring portions 12 and the substrate main body portions 11, and is finally electrically connected to the external connection terminals 16b. In the conductor pattern 14, the portion passing over the six connecting portions 13 functions as a coil, and the portions passing over the substrate main body portion 11 and the ring portion 12 are crossovers.

Here, the assembly of the first flexible substrate 10 for causing a part of the conductor pattern 14 to function as a coil will be described.
First, as shown in FIG. 2, the stator core 7 and the first flexible substrate 10 are overlapped. At this time, the first flexible substrate 10 is overlaid so that the conductor pattern 14 patterned on the substrate main body portion 11, the ring portion 12, and the connecting portion 13 contacts the stator core 7. Since the substrate body portion 11 is formed with a through hole 11a having a diameter substantially the same as the inner diameter of the core back 7a of the stator core 7, the core back 7a overlaps the substrate body portion 11 when superimposed. . Moreover, when superposed, the six teeth 7b with two gaps are overlapped with the connecting portion 13. Moreover, the front-end | tip part 7c of the six teeth 7b is the state which overlapped with the ring part 12. FIG.

Then, after the stator core 7 and the first flexible substrate 10 are overlapped, the connecting portion 13 overlapping the six teeth 7b is bent so as to wrap around the teeth 7b. At this time, since the conductor pattern 14 protrudes outward from the connecting portion 13, both ends P1 and P2 of the wiring 15 arranged in parallel on the connecting portion 13 overlap each other as shown in FIGS. It becomes a state. In addition, at this time, one end P1 and the other end P2 of the adjacent wiring 15 are overlapped. Then, the overlapping portions are joined by soldering, welding, pressure bonding, or the like, and the wirings 15 are electrically connected.
As a result, the periphery of the teeth 7b can be surrounded by the connecting portion 13, and the periphery of the teeth 7b can be spirally wound as shown in FIG. The pattern 14 can function as a coil.

  Thereafter, the external connection terminal 16a is connected to a three-phase AC power supply (not shown) and the other external connection terminal 16b is connected to the ground so that the coil functions as the U phase. Thereby, the assembly of the first flexible substrate 10 is completed.

  Moreover, since the said 2nd flexible substrate 20 is the same structure as the 1st flexible substrate 10, detailed description is abbreviate | omitted. However, as shown in FIGS. 2 and 9, the second flexible substrate 20 is different from the first flexible substrate 10 in the position where the connecting portion 13 is formed. That is, the second flexible board 20 is connected so as to overlap the tooth 7b at a position shifted in phase by one slot from the teeth 7b surrounded by the first flexible board 10 among the 18 teeth 7b. A portion 13 is formed.

  Further, since the third flexible substrate 30 has the same configuration as the first flexible substrate 10 like the second flexible substrate 20, a detailed description thereof will be omitted. However, the third flexible substrate 30 is different from the second flexible substrate 20 in the position where the connecting portion 13 is formed, as shown in FIGS. That is, the third flexible board 30 is connected so as to overlap the tooth 7b out of the 18 teeth 7b at a position shifted in phase by one slot from the teeth 7b surrounded by the second flexible board 20. A portion 13 is formed.

Therefore, when the second and third flexible substrates 20 and 30 are superposed on the stator core 7 together with the first flexible substrate 10, the connecting portions 13 of the flexible substrates 10, 20 and 30 overlap each other. There is no. Therefore, when the second flexible substrate 20 and the third flexible substrate 30 are assembled by a method similar to the method for assembling the first flexible substrate 10 described above, all the 18 teeth 7b of the stator core 7 are illustrated. As shown in FIG. 6, the connection portion 13 of the three flexible substrates 8 can be securely wrapped and surrounded.
At this time, as shown in FIG. 11, the third flexible substrate 30 is in a state where it overlaps the first flexible substrate 10 and the second flexible substrate 20 at the portion of the ring portion 12, but the portion of the connecting portion 13. Then, it is in the state which contacted the teeth 7 without being influenced by the thickness of the first and second flexible substrates 10 and 20. The same applies to the second flexible substrate 20.

  Then, the external connection terminal 16a is connected to a three-phase AC power supply and the other external connection terminal 16b is connected to the ground so that the coil of the second flexible substrate 20 functions as a V phase. In addition, the external connection terminal 16a is connected to a three-phase AC power supply, and the other external connection terminal 16b is connected to the ground so that the coil of the third flexible substrate 30 functions as a W phase. Thereby, the assembly of the second flexible substrate 20 and the third flexible substrate 30 is completed.

Next, operations of the spindle motor 2 and the recording medium driving apparatus 1 configured as described above will be described below.
First, a three-phase alternating current is supplied to the conductor pattern 14 of each flexible substrate 10, 20, 30. Then, a part of the conductor pattern 14 of each flexible substrate 10, 20, 30 functions as a coil (U phase, X phase, W phase) spirally wound around the teeth 7b. Is excited to generate a magnetic field. Due to this magnetic field, the permanent magnet 6 rotates around the axis L together with the hub 5. At this time, the stator core 7 has the tip 7c facing the outer peripheral surface of the permanent magnet 6 at the tip of the teeth 7b, so that the magnetic flux is transferred between the stator core 7 and the permanent magnet 6 densely. Accordingly, the hub 5 can be efficiently rotated.
Further, as the hub 5 rotates, the oil W flows along the thrust dynamic pressure generating groove and the radial dynamic pressure generating groove, so that the pressure increases. As a result, the hub 5 rotates smoothly because the fluid dynamic pressure bearing portion 3 supports the forces in the thrust direction and the radial direction.

  In particular, since the connecting portion 13 of each flexible substrate 10, 20, 30 having flexibility is surrounded by the teeth 7b, a part of the conductor pattern 14 can function as a coil. Unlike the case where the coil is constructed by mechanically winding the wire, there is no need to use a winding machine. Therefore, the number of teeth 7b, that is, the number of slots can be increased to 16. Therefore, the number of turns of the coil per one tooth 7b can be reduced, and the thickness can be suppressed as much as possible. Therefore, the overall thickness can be reduced.

  Further, since the conductor pattern 14 is patterned on the connecting portion 13, the conductor pattern 14 comes into contact with the tooth 7 b when the tooth 7 b is wrapped and surrounded by the connecting portion 13. That is, no useless gap is left between the conductor pattern 14 and the teeth 7b. Therefore, the length of the conductor pattern 14 can be reduced to the necessary minimum length, and the electrical resistance can be suppressed as much as possible. Therefore, magnetomotive force can be generated efficiently, and wasteful power consumption can be eliminated.

Further, since one surface of the stator core 7 other than the teeth 7b is exposed, the exposed area exposed to the atmosphere is larger than that of the conventional one. Further, the flexible substrate 8 is thin and easy to pass heat compared to an insulating resin or the like. As a result, heat generated by energization can be efficiently radiated. Therefore, it is possible to suppress the occurrence of malfunctions and peeling of parts due to heat, and the reliability can be improved.
In addition, since the stator core 7 is in contact with the base 9 at the core back 7a, the heat generated by energization not only flows to the atmosphere, but also actively flows to the base 9 side. Thus, since the heat flow path from the stator core 7 toward the base 9 is secured, the heat dissipation is excellent.

  Moreover, since it is not necessary to use a winding machine as mentioned above, as shown in FIG. 3, the clearance T between the adjacent front-end | tip parts 7c can be made as small as possible. Therefore, a part of the lines of magnetic force flowing through the teeth 7b can be passed to the adjacent teeth 7b via the tip 7c, and the magnetic force attracting the permanent magnet 6 and the tip 7c can be reduced. As a result, the cogging torque can be reduced and high performance can be achieved.

In addition, since the flexible substrate 8 is composed of three sheets, the conductor pattern 14 of the first flexible substrate 10 is dedicated to the U phase, and the conductor pattern 14 of the second flexible substrate 20 is dedicated to the V phase. A three-phase alternating current can be supplied with the conductor pattern 14 of the substrate 30 dedicated to the W phase. In this way, each flexible substrate 10, 20, 30 can be a dedicated substrate for the U phase, V phase, and W phase, respectively, so that other phases are not considered when patterning the conductor pattern 14. Patterning can be easily performed. That is, when the U-phase, V-phase, and W-phase conductor patterns 14 are patterned on a single flexible substrate, it is necessary to pattern the conductor patterns so that they do not come into electrical contact with each other, resulting in complicated wiring. In particular, there is a risk of disconnection or short-circuiting because the wiring overlaps in the portion that becomes the crossover.
However, since the spindle motor 2 of the present embodiment is divided into three flexible boards 10, 20, and 30, the conductor pattern 14 can be easily patterned without the possibility of such a problem. Wiring handling during assembly is facilitated. Therefore, manufacturing efficiency can be increased.

  Moreover, when the connection part 13 is bent and the circumference | surroundings of the teeth 7b are enclosed, the wiring 15 can be connected previously. Therefore, electrical connection can be made reliably and accurately, and the reliability of connection can be improved. Moreover, the connection location of the wiring 15 can be easily confirmed later. Also in this respect, the connection reliability can be improved.

As described above, according to the spindle motor 2 of the present embodiment, it is possible to reduce the thickness and improve the performance, and to increase the efficiency of the magnetomotive force and the heat dissipation. In particular, since a coil can be provided easily and in a short time without using a winding machine, the manufacturing efficiency can be improved and the cost can be reduced.
Further, according to the recording medium driving apparatus 1 of the present embodiment, since the spindle motor 2 that is thinned as described above is provided, the whole apparatus can be thinned. Further, since the spindle motor 2 is excellent in efficiency and heat dissipation of magnetomotive force and has high performance, power consumption can be suppressed and high quality can be achieved.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, in the said embodiment, although the case where the flexible substrate 8 comprised from the 3 board | substrate of the 1st flexible substrate 10, the 2nd flexible substrate 20, and the 3rd flexible substrate 30 was employ | adopted was taken as an example. This is not the only case. For example, 16 connecting portions 13 may be formed on one flexible substrate, and the conductor pattern 14 may be alternately patterned on the connecting portions 13 so as to be in the U phase, the V phase, and the W phase. However, as in the above-described embodiment, it is preferable that the conductive pattern 14 is patterned on each of the flexible substrates 10, 20, and 30, divided into three flexible substrates 10, 20, and 30.

In the above-described embodiment, the stator core 7 formed with 16 teeth 7b has been described as an example. However, the present invention is not limited to this, and it is only necessary to form the teeth 7b by a multiple of three. For example, the number of slots may be nine or 27.
Further, although the hub 5 is rotatably supported by the fluid dynamic pressure bearing portion 3, it may be a bearing portion which is simply rotatably supported without using the dynamic pressure.

Although the stator core 7 whose surface is coated with an insulating film is used, an insulating film may be formed on the conductor pattern 14 to insulate the stator core 7 and the conductor pattern 14 from each other. Even in this case, the same effects can be achieved.
Further, the flexible substrates 10, 20, and 30 may be stacked on the stator core 7 so that the conductor pattern 14 faces outward when the connecting portion 13 is surrounded by the teeth 7 b. By doing so, it is possible to achieve insulation between the stator core 7 and the conductor pattern 14 without forming an insulating film. That is, it is a method of insulation by using the base material itself of the flexible substrates 10, 20, and 30 as an insulating film.
However, it is more preferable that the conductive pattern 14 is configured to come into contact with the teeth 7b through the insulating film as in the above-described embodiment, since the length of the conductive pattern 14 can be suppressed and the electrical resistance can be reduced.

Moreover, in the said embodiment, as shown in FIG. 13, you may shape | mold the connection part 13 previously in the cross-sectional U shape with the substantially same width | variety as the teeth 7b so that the teeth 7b may be inserted in between. By doing so, when the stator core 7 and the flexible substrates 10, 20, 30 are overlapped, the teeth 7 b are naturally contained in the connecting portion 13. Therefore, it is possible to easily surround the periphery of the tooth 7b only by bending the connecting portion 13 that protrudes upward from the tooth 7b. Therefore, manufacturing efficiency can be further increased.
Moreover, even if it is a case where the clearance gap between adjacent teeth 7b becomes narrow by increasing the number of slots, it becomes easy to insert the connection part 13 in the teeth 7b volume, and an assembly becomes easy.

It is sectional drawing which shows one Embodiment of the motor and recording-medium drive device which concern on this invention. It is a disassembled perspective view of the stator core shown in FIG. 1, and the flexible substrate which consists of a 1st flexible substrate, a 2nd flexible substrate, and a 3rd flexible substrate. FIG. 3 is a top view of the stator core shown in FIG. 2. FIG. 3 is a top view of the first flexible substrate shown in FIG. 2. It is an enlarged view of the connection part of the 1st flexible substrate shown in FIG. 4, and the conductor pattern patterned on this connection part. FIG. 3 is an enlarged top view of teeth when the stator core and the flexible substrate shown in FIG. 2 are assembled. It is a cross-sectional arrow AA figure shown in FIG. It is a cross-sectional arrow BB figure shown in FIG. It is a top view of the 2nd flexible substrate shown in FIG. It is a top view of the 3rd flexible substrate shown in FIG. It is sectional drawing at the time of winding the connection part of a 3rd flexible substrate around the circumference | surroundings of teeth. It is a figure which shows the modification of a connection part, Comprising: It is sectional drawing of the connection part previously shape | molded by the cross-sectional U shape. It is sectional drawing which shows an example of the conventional disk drive device. FIG. 14 is a top view of a stator core and coils of the disk drive device shown in FIG. 13. It is a cross-sectional arrow CC figure shown in FIG. It is sectional drawing which shows another example of the conventional disk drive device. It is a cross-sectional arrow EE figure shown in FIG.

Explanation of symbols

D Hard disk (recording medium)
L axis X radial direction of stator core 1 recording medium driving device 2 spindle motor (motor)
3 Fluid dynamic bearing (bearing)
5 Hub (shaft)
5c Fitting part (holding part)
6 Permanent magnet 7 Stator core 7a Core back (annular part)
7b Teeth (tooth part)
7c End portion 8 Flexible substrate 10 First flexible substrate 11 Substrate body portion 11a Through hole 12 Ring portion 13 Connection portion 14 Conductor pattern 15 Wiring 20 Second flexible substrate 30 Third flexible substrate

Claims (7)

A shaft body rotatably supported around an axis,
An annular permanent magnet held by the shaft;
An annular portion arranged so as to surround the periphery of the permanent magnet, and a base end fixed to the annular portion, and formed so as to extend in a radial direction toward the permanent magnet, with a predetermined centering on the axis A stator core having a plurality of tooth pole portions provided for each angle and a tip portion formed at each of the tip ends of the plurality of tooth pole portions and facing the outer peripheral surface of the permanent magnet;
A substrate body portion in which a through hole having substantially the same diameter as the inner diameter of the annular portion is formed, a ring portion that is disposed in the through hole and is formed so as to overlap the tip portions of the plurality of tooth pole portions, Both ends are connected to the substrate main body and the ring portion, and a plurality of connecting portions formed to overlap the plurality of tooth pole portions, and patterned on the substrate main body portion, the ring portion, and the connecting portion, respectively. A conductive pattern, and an insulating flexible substrate disposed so as to be superposed on the stator core,
The connecting portion is formed in a size capable of surrounding the periphery of the tooth pole portion,
When the periphery of the tooth pole portion is surrounded by the connecting portion, the conductor pattern is excited around the tooth pole portion by spirally winding the portion patterned on the tooth pole portion. A motor characterized by functioning as a coil. The motor according to claim 1,
The stator core is formed with an insulating film on at least the tooth pole surface.
The motor is characterized in that the flexible substrate is disposed so as to be superimposed on the stator core in a state where the conductive pattern is in contact with the insulating film. The motor according to claim 1 or 2,
The multiple tooth pole portions are formed in a multiple of three, and the flexible substrate is composed of three substrates: a first flexible substrate, a second flexible substrate, and a third flexible substrate. ,
The first flexible substrate has the connecting portion so as to overlap the tooth pole portion with two spaces among the plurality of tooth pole portions,
The second flexible substrate is in relation to the tooth pole portion at a position shifted by one phase from the tooth pole portion surrounded by the connecting portion of the first flexible substrate among the plurality of tooth pole portions. Having the connecting part to overlap,
The third flexible substrate is in relation to the tooth pole portion at a position shifted by one phase from the tooth pole portion surrounded by the connecting portion of the second flexible substrate among the plurality of tooth pole portions. A motor having the connecting portion so as to overlap. The motor according to any one of claims 1 to 3,
A plurality of the conductor patterns are arranged in parallel on the connecting portion in parallel at a constant interval in the radial direction in a state where one electrically independent wiring is inclined with respect to the radial direction of the stator core. The motor is characterized in that one end and the other end of the adjacent wirings are electrically connected when the tooth pole portion is surrounded by the connecting portion. The motor according to claim 4,
The motor is characterized in that the conductor pattern is patterned so that both ends of the wiring protrude outward from the connecting portion. The motor according to any one of claims 1 to 5,
The motor is characterized in that the connecting portion is formed in a U-shaped cross section in advance so that the tooth pole portion is inserted between the stator core and the flexible substrate. The motor according to any one of claims 1 to 6,
A holding unit for holding a recording medium provided on the shaft body and capable of recording various kinds of information;
A recording medium driving apparatus comprising: a bearing portion that supports the shaft body rotatably about the axis.

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