JP2009118549A - Stator, motor, and recording medium drive - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a high performance stator in which the number of layers of a coil can be made odd without crossing a lead wire in the air, and which is thin and is free of torque drop with good productivity. <P>SOLUTION: This stator 6 to be provided includes a stator core 10, which includes an annular section 10a that is formed annularly around an axis L, a plurality of teeth 10b that are formed to extend in its radial direction toward a permanent magnet at each predetermined angle centering upon the axis, and tips 10c that face the peripheral face of the permanent magnet, being formed at the tips of the plurality of teeth, a wiring pattern 12, which is so patterned on the topside of a stator core as to severally parallel the plurality of teeth, while having connecting pads 12a and 12b at both ends, and in which one connecting pad 12a is arranged on the tip side and also the other connecting pad 12b is arranged on the annular section, and coils 11, which are wound around the teeth while the end of at least each lead wire 14 is connected to one connecting pad. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

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

  In recent years, recording medium drive devices such as hard disk drive devices (HDD) have begun to be adopted in various electronic devices such as portable music playback devices and mobile phones. In particular, portable electronic devices will become the mainstream in the future due to their convenience, and further miniaturization and thinning are required. Along with this, miniaturization and thinning of motors for driving HD (hard disks) have been attempted.

  Here, a recording medium driving apparatus having a general motor will be briefly described with reference to FIGS. As shown in FIG. 24, the recording medium driving apparatus 100 includes a stator portion 103 having a coil 101 and a stator core 102, and a rotor portion 106 having a permanent magnet 104 and a hub 105. The hub 105 is supported by a sleeve 107 so as to be rotatable around an axis L, and a fitting portion 105a that fits into the central hole of the hard disk D is formed at the upper end. Thereby, the hard disk D is fixed to the hub 105. A permanent magnet 104 is fixed to the outer periphery of the hub 105 so as to face the stator core 102 with a predetermined distance.

  The sleeve 107 is fixed to the base 108 and rotatably supports the hub 105. At this time, a slight gap is secured between the sleeve 107 and the hub 105, and the gap W is filled with oil W. On the surface of the hub 105 or the sleeve 107, radial dynamic pressure generating grooves and thrust dynamic pressure generating grooves (not shown) called herringbone grooves are appropriately formed. As a result, when the hub 105 rotates around the axis L, the hub 105 rotates stably without being shaken in the thrust direction and the radial direction. That is, the hub 105 is supported by the fluid dynamic pressure bearing.

  As shown in FIG. 25, the stator core 102 includes a core back 102a formed in an annular shape, and a plurality of tooth poles formed so that the proximal end side is fixed to the core back 102a and extends in the radial direction. Part (teeth) 102b. The stator core 102 is supported by the base 108 on the core back 102a side. The tooth pole portions 102b 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.

  Further, the coil 101 is wound around each of the plurality of tooth pole portions 102b. 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). At this time, a crossover wire 101 a is installed between the coil 101 and the coil 101.

  When the hard disk D is driven by the recording medium driving device 100 configured as described above, first, a three-phase alternating current is supplied to the coil 101 to generate a magnetic field in the coil 101. This magnetic field acts on the permanent magnet 104 via the tooth pole portion 102b to rotate the rotor portion 106 around the axis L. Thereby, the hard disk D fixed to the rotor part 106 by the fitting part 105a can be rotated.

  Incidentally, as described above, motors are required to be further reduced in size and thickness for the future. Here, in order to reduce the thickness of the coil 101, the method of reducing the number of layers of the coil 101 (the number of layers in the thickness direction) is an effective method when the motor is to be thinned. In some cases, it is desired to end the winding with an odd number of layers (preferably one layer). However, as shown in FIG. 26, since the coil 101 needs to be subjected to the crossover 101a, it cannot be wound at the tip end side of the tooth pole portion 102b. That is, in order to lead a conducting wire (coil wire) to the next tooth pole portion 102b, the number of layers of the coil 101 generally needs to be an even layer.

On the other hand, a stator is known in which the coil layer can be an odd layer.
As one of them, there is known a stator in which a notch (conductive wire locking portion) for locking the winding end conductive wire is formed at the tip of the tooth pole portion (see Patent Document 1). According to this stator, since the winding end conductor can be hooked on the notch and folded back to the core back side, the number of coils can be made an odd number.
As another stator, there is known a stator in which a locking portion for locking a winding end conductor is formed at the tip of a tooth pole portion (see Patent Document 2). Similarly, in this stator, the winding end conductor can be hooked on the engaging portion and folded back to the core back side, so that the number of coil layers can be made an odd number.
According to these stators described above, the thickness of the coil can be made as thin as possible, which can contribute to a reduction in the thickness of the motor. Moreover, the space where the thickness is reduced (the space in the winding height direction) can be effectively used as another space.
JP 2003-230243 A JP 2003-324886 A

However, the following problems still remain in the conventional stator.
That is, in the above-described conventional stator, the conducting wire at the end of winding is hooked on the notch portion or the locking portion and then folded back to the core back side, but the conducting wire in the meantime crosses the air. For this reason, there is a possibility that other parts or jigs will come into contact with the wire part that crosses the air during assembly, or that the wire and coil may come into contact with each other for some reason such as vibration or impact during operation. there were. Normally, the surface of the conductor is coated with an insulating layer to ensure electrical insulation. However, if contact is made, the insulating layer may be damaged and peeled off, resulting in a problem with the motor.

Further, in order to reduce the thickness and size of the motor, it is necessary to design the stator itself in a small size, and thus the size of the tooth pole portion must be designed to be naturally small. Therefore, the dimension of a notch part and a latching part will also become small. Therefore, it is difficult to hook the lead wire accurately on the notch or the locking portion, resulting in a decrease in productivity.
In particular, when a conductive wire is wound around the tooth pole portion to form a coil, it is necessary to wind the conductive wire while applying a certain amount of tension in order to prevent loosening. Therefore, it is difficult to hook the lead wire to the cutout portion or the locking portion. In addition, since tension is applied, the insulation layer of the conductive wire is easily peeled off when it is hooked, and the conductive wire may be cut off.

  Furthermore, in order to form a notch part and a locking part, the width | variety of the front-end | tip of a tooth pole part must be narrowed, and the opposing area with a permanent magnet will reduce. As a result, the amount of magnetic flux is reduced, and the torque may be reduced.

  The present invention has been made in view of such circumstances, and its purpose is to make the number of coil layers an odd number without traversing the conductor in the air, reducing productivity and reducing torque. A high-performance stator, a motor having the stator, and a recording medium driving apparatus having the motor are provided.

The present invention provides the following means in order to solve the above problems.
A stator according to the present invention is a stator that is disposed to face a permanent magnet that rotates around an axis, and an annular portion that is formed in an annular shape around the axis, and a base end that is fixed to the annular portion. And a plurality of tooth pole portions formed so as to extend in the radial direction toward the permanent magnet at every predetermined angle centered on the axis, and the permanent magnets formed at the tips of the plurality of tooth pole portions, respectively. A stator core having a tip portion facing the peripheral surface of the stator core, and in a state having connection pads at both ends, the upper surface of the stator core is patterned along the plurality of tooth pole portions, and one connection pad is The wiring pattern in which the other connection pad is arranged on the annular portion side, and at least the end portion of the conductive wire is connected to the one connection pad while being arranged on the distal end side, and around the tooth pole portion And it is characterized in that it comprises a wound coil.

  In the stator according to the present invention, when a predetermined current is supplied to the coil, each tooth pole portion is excited to generate a magnetic field. By this magnetic field, the permanent magnet can be rotated around the axis. At this time, since the stator core has a tip portion facing the peripheral surface of the permanent magnet at the tip of the tooth pole portion, the transfer of magnetic flux between the stator core and the permanent magnet becomes dense. Therefore, the permanent magnet can be rotated efficiently.

  In particular, on the upper surface of the stator core, a wiring pattern having connection pads at both ends is patterned along the plurality of tooth pole portions. Moreover, this wiring pattern is in a state in which one connection pad is arranged on the tip side and the other connection pad is arranged on the annular side. Therefore, when winding the conductive wire around each tooth pole portion to configure the coil, even if the winding end or winding start is on the tip side, just connecting the end of the conductive wire to one connection pad, Electrical extraction can be performed from the other connection pad to the annular portion side.

Therefore, the number of coils can be made an odd number, and there is no need to fold back to the annular portion side while traversing the conducting wire in the air as in the prior art. Therefore, the stator can be thinned, and there is no fear that the lead wire or the coil is damaged by rubbing or the like, so that high quality can be achieved. In addition, there is no need for the trouble of hooking the lead wire to the notch or the locking portion as in the prior art, and the number of coils can be made an odd number of layers by simply connecting the end of the lead wire to one connection pad. Therefore, the stator can be manufactured with high productivity. Further, since the shape of the tip portion of the stator core is not affected at all, the facing area with the permanent magnet is not reduced. Therefore, the amount of magnetic flux entering the stator core does not decrease, and the torque can be prevented from decreasing.
In addition, by electrically connecting the other connection pad to the conductive wire of another coil, a plurality of coils can be used in a predetermined combination, and the coil has three phases (U phase, V phase, W phase). It is possible to make it work.

  The stator according to the present invention is a stator that is disposed opposite to a permanent magnet that rotates about an axis, and an annular part that is formed in an annular shape around the axis, and a base end that is fixed to the annular part. And a plurality of tooth pole portions formed so as to extend in the radial direction toward the permanent magnet at every predetermined angle centered on the axis, and formed at the tips of the plurality of tooth pole portions, respectively. A stator core having a tip portion facing the peripheral surface of the permanent magnet, a sheet-like insulating substrate formed in substantially the same outer shape as the stator core and superimposed on the upper surface of the stator core, and connection pads at both ends. In this state, patterning is performed on the upper surface of the insulating substrate along each of the plurality of tooth pole portions, and one connection pad is disposed on the tip portion side, and the other connection pad is on the annular portion side. A wiring pattern arranged and a coil wound around the insulating substrate and the tooth pole portion in a state where at least an end portion of the conducting wire is connected to the one connection pad. It is a feature.

  In the stator according to the present invention, when a predetermined current is supplied to the coil, each tooth pole portion is excited to generate a magnetic field. By this magnetic field, the permanent magnet can be rotated around the axis. At this time, since the stator core has a tip portion facing the peripheral surface of the permanent magnet at the tip of the tooth pole portion, the transfer of magnetic flux between the stator core and the permanent magnet becomes dense. Therefore, the permanent magnet can be rotated efficiently.

  In particular, on the upper surface of the insulating substrate superimposed on the stator core, a wiring pattern having connection pads at both ends is patterned so as to follow the plurality of tooth pole portions of the stator core. Moreover, this wiring pattern is in a state in which one connection pad is disposed on the front end portion side of the stator core and the other connection pad is disposed on the annular portion side of the stator core. Therefore, when a coil is formed by winding a conductive wire around each tooth pole portion together with the insulating substrate, even if the winding end or winding start is on the tip side, the end of the conductive wire is connected to one of the connection pads. It is possible to perform electrical extraction from the other connection pad to the annular portion side simply by connecting to.

Therefore, in addition to the number of coils being an odd number of layers, there is no need to fold back to the annular portion side while traversing the conducting wire in the air as in the prior art. Therefore, the stator can be thinned, and there is no fear that the lead wire or the coil is damaged by rubbing or the like, so that high quality can be achieved. Note that the insulating substrate has a thin sheet shape and does not affect the thinning.
In addition, there is no need for the trouble of hooking the lead wire to the notch or the locking portion as in the prior art, and the number of coils can be made an odd number of layers by simply connecting the end of the lead wire to one connection pad. Therefore, the stator can be manufactured with high productivity. Further, since the shape of the tip portion of the stator core is not affected at all, the facing area with the permanent magnet is not reduced. Therefore, the amount of magnetic flux entering the stator core does not decrease, and the torque can be prevented from decreasing.

Furthermore, since the wiring pattern is patterned on a dedicated substrate called an insulating substrate, the patterning operation can be performed regardless of the manufacturing process of the stator core. Therefore, the work can be performed efficiently and the productivity can be further improved, and high-precision patterning is easy.
In addition, by electrically connecting the other connection pad to the conductive wire of another coil, a plurality of coils can be used in a predetermined combination, and the coil has three phases (U phase, V phase, W phase). It is possible to make it work.

  Moreover, the stator according to the present invention is the stator according to the present invention, wherein the wiring pattern has the other connection pad in the vicinity of another tooth pole portion different from the tooth pole portion where the one connection pad is arranged. It is patterned so that it may extend along the said annular part so that may be arrange | positioned.

  In the stator according to the present invention, a wiring pattern can also be formed with respect to a portion corresponding to the connecting wire between the tooth pole portion and the tooth pole portion (between the slots). The thickness can be made much thinner than in the case. Therefore, the stator can be further reduced in thickness.

  The stator according to the present invention is a stator that is disposed opposite to a permanent magnet that rotates about an axis, and an annular part that is formed in an annular shape around the axis, and a base end that is fixed to the annular part. And a plurality of tooth pole portions formed so as to extend in the radial direction toward the permanent magnet at every predetermined angle centered on the axis, and formed at the tips of the plurality of tooth pole portions, respectively. A stator core having a tip portion facing the peripheral surface of the permanent magnet, and a first core that is patterned on each of the tip portions so as to extend along a circumferential direction centered on the axis, and has connection pads at both ends. A wiring pattern and a coil wound around the tooth pole portion in a state where at least an end portion of the conductive wire is connected to the connection pad, and formed in a ring shape so as to overlap a plurality of the tip portions, these Multiple destinations A sheet-like insulating substrate that is superimposed on the upper surface of the stator core so as to overlap the portion, and a pattern that is patterned on the back surface of the insulating substrate, and the coil is connected in a predetermined combination when the insulating substrate is superimposed. And a second wiring pattern for connecting the connection pads corresponding to the coil to each other.

  In the stator according to the present invention, when a predetermined current is supplied to the coil, each tooth pole portion is excited to generate a magnetic field. By this magnetic field, the permanent magnet can be rotated around the axis. At this time, since the stator core has a tip portion facing the peripheral surface of the permanent magnet at the tip of the tooth pole portion, the transfer of magnetic flux between the stator core and the permanent magnet becomes dense. Therefore, the permanent magnet can be rotated efficiently.

In particular, a first wiring pattern having connection pads at both ends is patterned at the tip of the stator core. For this reason, when a coil is formed by winding a conductive wire around each tooth pole portion, the end portion of the conductive wire can be connected to the connection pad even if the winding end or winding start is on the distal end side.
Incidentally, a ring-shaped insulating substrate is overlaid on the upper surface of the stator core so as to overlap a plurality of tip portions. Then, the connection pads corresponding to the coils are connected to each other so as to connect the coils in a predetermined combination by the second wiring pattern patterned on the back surface of the insulating substrate. Therefore, electrical extraction can be performed on the annular portion side using the second wiring pattern and the counterpart coil.

Therefore, in addition to the number of coils being an odd number of layers, there is no need to fold back to the annular portion side while traversing the conducting wire in the air as in the prior art. Therefore, the stator can be thinned, and there is no fear that the lead wire or the coil is damaged by rubbing or the like, so that high quality can be achieved. Note that the insulating substrate has a thin sheet shape and does not affect the thinning.
In addition, there is no need to hang a lead wire on a notch or a locking portion as in the conventional case, and the number of coil layers can be reduced by simply connecting the end of the lead to a connection pad patterned on the tip. Therefore, the stator can be manufactured with high productivity. Further, since the shape of the tip portion of the stator core is not affected at all, the facing area with the permanent magnet is not reduced. Therefore, the amount of magnetic flux entering the stator core does not decrease, and the torque can be prevented from decreasing.
Since a plurality of coils can be used in a predetermined combination, the coils can function as three phases (U phase, V phase, W phase).

  A motor according to the present invention includes the stator according to the present invention, and a shaft body that is rotatably supported around the axis while holding the permanent magnet. .

  Since the motor according to the present invention includes a thin and high-performance stator in which a reduction in torque is suppressed, the motor itself can be made thinner and higher performance.

  The recording medium driving apparatus according to the present invention includes the motor 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 rotates the shaft body around the axis. And a bearing portion that supports the bearing.

  Since the recording medium driving apparatus according to the present invention includes a motor that is thin and high in performance, the apparatus itself can be thin and high in performance.

According to the stator of the present invention, the number of coil layers can be made an odd number without traversing the conducting wire in the air, and productivity can be improved, the thickness can be reduced, and torque reduction can be prevented. As a result, high performance can be achieved.
In addition, according to the motor and the recording medium driving apparatus according to the present invention, it is possible to reduce the thickness and improve the performance.

(First embodiment)
A first embodiment according to the present invention will be described below 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 hydrodynamic pressure bearing portion (bearing) that supports the hub 4 so as to be rotatable about the axis L. Part) 3.

The spindle motor 2 is an inner rotor type motor, and surrounds the hub 4 supported rotatably around the axis L, the annular permanent magnet 5 held by the hub 4, and the periphery of the permanent magnet 5. And the stator 6 disposed so as to face each other.
The hub 4 is formed with a shaft portion 4a formed in a substantially cylindrical shape centering on the axis L, and extending radially outward from the outer peripheral surface of the shaft portion 4a. And a flange portion 4b formed so as to be sandwiched. Further, the upper end of the hub 4 is inserted into the center hole of the hard disk D and serves as the fitting portion 4c for fitting and holding the hard disk D. Further, the permanent magnet 5 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 permanent magnet 5 is held by the flange portion 4b.

  The fluid dynamic pressure bearing portion 3 includes a sleeve 7 formed in a cup shape and having a base end fixed by a base, and an oil W supplied between the sleeve 7 and the hub 4. The sleeve 7 is an accommodating portion in which the inside of the sleeve 7 is formed in a circular shape and the shaft portion 4a is accommodated. In addition, a flange portion 7 a formed to extend outward in the radial direction is formed at the upper end of the sleeve 7. Further, a small gap is designed between the sleeve 7 and the hub 4, and oil W is supplied to the gap. The oil W is prevented from leaking to the permanent magnet 5 side by a seal (not shown).

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 7a facing the flange portion 4b. Similarly, a plurality of radial dynamic pressure generating grooves called herringbone grooves (not shown) are formed on the outer surface of the shaft portion 4a facing the inner peripheral surface of the sleeve 7. As a result, when the hub 4 rotates, the oil W flows along the thrust dynamic pressure generating grooves and the radial dynamic pressure generating grooves to increase the pressure, so that the hub 4 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.

  As shown in FIG. 2, the stator 6 includes a stator core 10 and a coil 11 wound around a later-described tooth 10b of the stator core 10. As shown in FIG. It is fixed in the state where it was mounted on.

The stator core 10 is formed by laminating (for example, three layers) magnetic plates such as silicon steel plates formed by stamping with a press or the like, and has an annular shape about the axis L as shown in FIGS. A core back (annular portion) 10a formed on the core back 10a and a base end fixed to the core back 10a and extending in a radial direction toward the permanent magnet 5; The teeth (tooth portion) 10b formed with 9 pieces (ie, the number of slots is 9 slots) for each degree, and the outer peripheral surface (peripheral surface) of the permanent magnet 5 formed at the tips of these teeth 10b, respectively. And a front end portion 10c facing the front end.
The outer surface of the stator core 10 thus configured is coated with an insulating film (not shown).

A plurality of wiring patterns 12 are patterned on the upper surface of the stator core 10. Each wiring pattern 12 has connection pads 12a and 12b at both ends, respectively, and is patterned along the nine teeth 10b. In FIG. 1, the wiring pattern 12 is not shown.
Of the two connection pads 12a and 12b, one connection pad 12a is arranged on the tip portion 10c side, and the other connection pad 12b is patterned on the core back 10a side. Moreover, in the present embodiment, each wiring pattern 12 is patterned so as to extend along the core back 10a, and the other connection pad 12b is not in the vicinity of the tooth 10b on which the one connection pad 12a is formed, but the teeth. Two gaps from 10b are arranged on the core back 10a in the vicinity of the third tooth 10b.

  However, three wiring patterns 12 among the plurality of wiring patterns 12 are patterned in a state where the other connection pads 12b are gathered on the core back 10a in the vicinity of one tooth 10b, and function as ground terminals. The plurality of wiring patterns 12 are coated with an insulating film (not shown) except for both connection pads 12a and 12b.

  As shown in FIG. 2, the coil 11 is composed of a conducting wire (coil wire) 14 wound around the teeth 10b, and at least an end of the conducting wire 14 is electrically connected to one connection pad 12a. ing. The coils 11 function as a U phase, a V phase, and a W phase, respectively. Specifically, the conductive wire 14 is wound around the tooth 10b in combination with the wiring pattern 12 so that the three teeth 10b can be electrically connected as a set. The conductor 14 is covered with an insulating film (not shown).

Here, focusing on only one phase (for example, U phase) of the three phases, a combination of the conductive wire 14 and the wiring pattern 12 will be described.
First, as shown in FIG. 5, the conductive wire 14 is wound around the first tooth 10b (indicated by the arrow A) in a state of being neatly aligned from the core back 10a side toward the tip portion 10c. At this time, the end portion of the conducting wire 14 that has been wound is electrically connected to one connection pad 12a. In this way, since the end portion of the conductive wire 14 can be connected to the one connection pad 12a, the conductive wire 14 can be wound by an odd number of layers (one layer or three layers), and the number of layers of the coil 11 can be reduced. It can be an odd number of layers.

Similarly, in the second tooth 10b (indicated by the arrow B) that is disposed at a position two spaces away from the first tooth 10b, the conductive wire 14 extends from the core back 10a side to the tip portion 10c. It is wound in a neatly aligned state. At this time, the end portion of the conducting wire 14 at the start of winding is connected to the other connection pad 12 b of the wiring pattern 12 as shown in FIGS. 6 and 7. As a result, the coil 11 wound around the first tooth 10b and the coil 11 wound around the second tooth 10b are electrically connected via the wiring pattern 12. Yes.
Further, the end portion of the conductive wire 14 that has been wound is electrically connected to one connection pad 12a as shown in FIGS. Therefore, the number of layers of the coil 11 can be set to an odd number as in the previous case. 7 and 8 illustrate the case where the number of layers of the coil 11 is one as an example.

  Further, as shown in FIG. 5, the lead wire 14 is also connected to the core back in the third tooth 10 b (indicated by an arrow C) disposed at a position two spaces away from the second tooth 10 b. It is wound in a state of being neatly aligned from the 10a side toward the tip portion 10c. At this time, the winding start end portion and winding end end portion of the conducting wire 14 are the same as those of the coil 11 wound around the second tooth 10b. Thereby, the number of layers of the coil 11 can be made into an odd number layer. In addition, the coil 11 wound around the second tooth 10 b and the coil 11 wound around the third tooth 10 b are in an electrically conductive state via the wiring pattern 12. . The other connection pad 12b of the wiring pattern 12 connected to the conductive wire 14 wound around the third tooth 10b functions as a ground terminal as described above.

  Thus, the three coils 11 are electrically connected via the wiring pattern 12 and function as the U phase. Similarly, a conductive wire 14 is wound around the remaining six teeth 10b in combination with the wiring pattern 12, and functions as the remaining two-phase (V-phase, W-phase) coils 11. In addition, the conducting wire 14 of the coil 11 that functions as each phase is electrically connected to a three-phase AC power source (not shown).

Next, the operation of the recording medium driving apparatus 1 configured as described above will be described below.
First, a three-phase alternating current is supplied to the conducting wire 14 of each coil 11 to excite the teeth 10b and generate a magnetic field. With this magnetic field, the hard magnet D can be rotated by rotating the permanent magnet 5 and the hub 4 around the axis L. At this time, since the stator core 10 has the tip portion 10c facing the outer peripheral surface of the permanent magnet 5 at the tip of the tooth 10b, the transfer of magnetic flux between the stator core 10 and the permanent magnet 5 becomes dense. Therefore, the hub 4 can be efficiently rotated.
Further, as the hub 4 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 4 rotates smoothly because the forces in the thrust direction and the radial direction are supported by the fluid dynamic pressure bearing portion 3.

  In particular, a wiring pattern 12 having connection pads 12 a and 12 b at both ends is patterned on the upper surface of the stator core 10. In addition, the wiring pattern 12 is in a state where one connection pad 12a is disposed on the tip portion 10c side and the other connection pad 12b is disposed on the core back 10a side. Therefore, when the conductive wire 14 is wound around each tooth 10b to form the coil 11, even if the winding end is on the tip portion 10c side, the end portion of the conductive wire 14 is simply connected to one connection pad 12a. In addition, electrical extraction can be performed from the other connection pad 12b to the core back 10a side.

Therefore, in addition to the number of layers of the coil 11 being an odd number of layers, it is not necessary to fold back to the core back 10a side while traversing the conducting wire 14 in the air as in the prior art. Therefore, the stator 6 can be thinned, and there is no fear that the conductive wire 14 and the coil 11 are damaged by rubbing or the like, so that high quality can be achieved. In particular, since the insulating layer does not peel off, unexpected electrical contact can be eliminated, and the performance of the spindle motor 2 is unlikely to deteriorate.
In addition, the trouble of hooking the lead wire 14 to the notch portion or the locking portion as in the prior art is unnecessary, and the number of layers of the coil 11 can be reduced by simply connecting the end portion of the lead wire 14 to one connection pad 12a. Since the odd number of layers can be formed, the stator 6 and the spindle motor 2 can be manufactured with high productivity. Further, since the shape of the tip portion 10c of the stator core 10 is not affected at all, the area facing the permanent magnet 5 is not reduced. Therefore, the amount of magnetic flux entering the stator core 10 is not reduced, and the torque can be prevented from decreasing.

  In the present embodiment, the wiring pattern 12 is patterned not only on the teeth 10b but also on the core back 10a. Therefore, the thickness of the wiring portion between the teeth 10b and the teeth 10b (between the slots) can be made much thinner than in the case of a general crossover wire around which the conducting wire 14 is routed. In this respect also, it is possible to reduce the thickness.

As described above, according to the stator 6 of this embodiment, by patterning the wiring pattern 12 on the upper surface of the stator core 10, the number of layers of the coil 11 can be made an odd number without traversing the conductor 14 in the air. In addition, the productivity can be improved and the thickness can be reduced, and the performance can be improved by preventing a decrease in torque.
Further, since the spindle motor 2 of the present embodiment includes the stator 6 described above, the spindle motor 2 itself can be reduced in thickness and performance. Furthermore, since the recording medium driving apparatus 1 of the present embodiment includes the spindle motor 2 described above, it can be similarly reduced in thickness and performance.

(Second Embodiment)
Next, a second embodiment according to the present invention will be described with reference to FIGS. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
The difference between the second embodiment and the first embodiment is that in the first embodiment, the wiring pattern 12 is patterned not only on the teeth 10b but also on the core back 10a, and the other connection pads 12b are connected to the other teeth 10b. In the second embodiment, the wiring pattern 12 is arranged so that the other connection pad 12b is arranged in the vicinity of the tooth 10b on which the one connection pad 12a is formed. It is a point that is patterned.

That is, as shown in FIGS. 9 to 11, the stator 20 of the present embodiment includes the stator core 10 in which the wiring pattern 12 is patterned in a line shape from the core back 10 a to the tip end portion 10 c on each tooth 10 b. Yes.
Thus, since the wiring pattern 12 is patterned in a line shape, the other connection pad 12b is disposed in the vicinity of the tooth 10b where the one connection pad 12a is formed. Also in this embodiment, as in the first embodiment, at least the end portion of the conductive wire 14 is electrically connected to one connection pad 12a as shown in FIG. 9, and the coil 11 is U-phase, V-phase. , And W phase.

Here, focusing on only one phase (for example, U phase) of the three phases, a combination of the conductive wire 14 and the wiring pattern 12 will be described.
First, as shown in FIG. 12, the end of the conductive wire 14 is electrically connected to the other connection pad 12b of the wiring pattern 12 patterned on the first tooth 10b (indicated by the arrow A). . Further, after the end portion (start of winding) of another conductive wire 14 is electrically connected to one connection pad 12a of the same wiring pattern 12, it is neatly aligned from the tip portion 10c side toward the core back 10a. It is wound around the teeth 10b. In this way, since the end of the winding start of the conducting wire 14 can be connected to one of the connection pads 12a, the conducting wire 14 can be wound only by an odd number of layers (one layer or three layers). The number of layers can be an odd number.

Then, the conductive wire 14 that has finished winding the first tooth 10b and has reached the core back 10a becomes a crossover on the core back 10a, and is arranged at a position spaced by two from the first tooth 10b. It is constructed toward the third tooth 10b (indicated by arrow B). Then, the conductive wire 14 reaching the second tooth 10b is electrically connected to the other connection pad 12b of the wiring pattern 12 patterned on the tooth 10b.
On the other hand, in the second tooth 10b, after the end portion of another conductor 14 is electrically connected to one connection pad 12a, the tip portion 10c side is directed to the core back 10a as before. It is wound in a well-aligned state. Thereby, the coil 11 wound around the first tooth 10b and the coil 11 wound around the second tooth 10b are in a state of being electrically conducted via the wiring pattern 12. .

Further, the end portion of the conductive wire 14 that has been wound becomes a crossover wire on the core back 10a in the same manner as described above, and is arranged at a position spaced by two from the second tooth 10b. It is installed toward the tooth 10b (indicated by the arrow C). Then, the conductive wire 14 reaching the third tooth 10b is electrically connected to the other connection pad 12b of the wiring pattern 12 patterned on the tooth 10b.
On the other hand, in the third tooth 10b, after the end portion of another conductor 14 is electrically connected to one connection pad 12a, the tip portion 10c side is directed to the core back 10a as before. It is wound in a well-aligned state. As a result, the coil 11 wound around the second tooth 10b and the coil 11 wound around the third tooth 10b are in an electrically conductive state via the wiring pattern 12. . In addition, the conducting wire 14 which has finished winding the third tooth 10b is connected to the ground.

  Thus, also in this embodiment, the three coils 11 are electrically connected via the wiring pattern 12, and function as the U phase. Similarly, a conductive wire 14 is wound around the remaining six teeth 10b in combination with the wiring pattern 12, and functions as the remaining two-phase (V-phase, W-phase) coils 11. In addition, the conducting wire 14 of the coil 11 that functions as each phase is electrically connected to a three-phase AC power source (not shown).

Even with the stator 20 configured as described above, the same operational effects as those of the first embodiment can be obtained.
In the second embodiment, when the conductive wire 14 is wound around each tooth 10b, the end of the conductive wire 14 at the beginning of winding is connected to one connection pad 12a of the wiring pattern 12, and then toward the core back 10a. However, on the contrary, as shown in FIG. 13, it may be wound from the core back 10a side toward the tip portion 10c. In this case, the end of the wire 14 at the end of winding may be connected to one connection pad 12a. Further, after connecting the end of another conductor 14 to the other connection pad 12b of the wiring pattern 12 patterned on the first tooth 10b, the core back 10a is installed as a crossover, and the second connection pad 12b is directly connected to the second connection pad 12b. The teeth 10b may be wound from the core back 10a side.

(Third embodiment)
Next, a third embodiment according to the present invention will be described with reference to FIGS. In the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
The difference between the third embodiment and the first embodiment is that the wiring pattern 12 is patterned on the stator core 10 in the first embodiment, but is patterned on a dedicated substrate in the third embodiment.

That is, as shown in FIGS. 14 and 15, the stator 30 of the present embodiment is formed with a stator core 10 and a sheet-like insulating property that is formed in substantially the same outer shape as the stator core 10 and is superimposed on the upper surface of the stator core 10. And a substrate 31. A wiring pattern 12 having the same pattern shape as that of the first embodiment is patterned on the upper surface of the insulating substrate 31.
In addition, the coil 11 according to the present embodiment includes a conductive wire 14 wound around the tooth 10b together with the insulating substrate 31, and at least an end portion of the conductive wire 14 is electrically connected to one connection pad 12a. It is connected. The coils 11 function as a U phase, a V phase, and a W phase, respectively.

In addition, the winding method of the conducting wire 14 is the same as that of 1st Embodiment, However, The combination of the conducting wire 14 and the wiring pattern 12 is demonstrated paying attention to only 1 phase (for example, U phase) among 3 phases.
First, as shown in FIG. 16, the conductive wire 14 is wound around the first tooth 10b (indicated by the arrow A) in a state of being neatly aligned from the core back 10a side toward the tip portion 10c. At this time, the end of the conductive wire 14 that has been wound is electrically connected to one connection pad 12 a of the wiring pattern 12 patterned on the insulating substrate 31. In this way, since the end portion of the conductive wire 14 can be connected to the one connection pad 12a, the conductive wire 14 can be wound by an odd number of layers (one layer or three layers), and the number of layers of the coil 11 can be reduced. It can be an odd number of layers.

Further, in the second tooth 10b (indicated by an arrow B) that is disposed at a position two spaces away from the first tooth 10b, another conductor 14 is provided from the core back 10a side to the tip portion 10c. It is wound in a neatly aligned state. At this time, the end portion of the conducting wire 14 at the start of winding is connected to the other connection pad 12b of the wiring pattern 12 described above. As a result, the coil 11 wound around the first tooth 10b and the coil 11 wound around the second tooth 10b are electrically connected via the wiring pattern 12. Yes.
Moreover, the end part of the conducting wire 14 which has been wound is electrically connected to the one connection pad 12a as before. Therefore, the number of layers of the coil 11 can be set to an odd number as in the previous case.

  In addition, another conductive wire 14 is provided from the core back 10a side to the tip end portion 10c in the third tooth 10b (indicated by an arrow C) disposed at a position two spaces from the second tooth 10b. It is wound in a neatly aligned state. At this time, the winding start end portion and winding end end portion of the conducting wire 14 are the same as those of the coil 11 wound around the second tooth 10b. Thereby, the number of layers of the coil 11 can be made into an odd number layer. In addition, the coil 11 wound around the second tooth 10b and the coil 11 wound around the third tooth 10b are electrically connected via the wiring pattern 12.

  Thus, also in this embodiment, the three coils 11 are electrically connected via the wiring pattern 12, and function as the U phase. Similarly, a conductive wire 14 is wound around the remaining six teeth 10b in combination with the wiring pattern 12, and functions as the remaining two-phase (V-phase, W-phase) coils 11.

  Even with the stator 30 configured as described above, the same effects as those of the first embodiment can be obtained. In addition, since the wiring pattern 12 is patterned on a dedicated substrate called the insulating substrate 31, the patterning operation can be performed regardless of the manufacturing process of the stator core 10. Therefore, the work can be performed efficiently, productivity can be further improved, and high-precision patterning is easy to perform. Since the insulating substrate 31 is a thin sheet, it does not affect the thinning.

(Fourth embodiment)
Next, a fourth embodiment according to the present invention will be described with reference to FIGS. In the fourth embodiment, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.
The difference between the fourth embodiment and the first embodiment is that, in the first embodiment, the wiring pattern 12 is patterned along the plurality of teeth 10b, but in the fourth embodiment, the patterning is performed only on the tip portion 10c. In addition, the insulating substrate 41 is used.

That is, as shown in FIG. 17, the stator 40 of the present embodiment is formed in a ring shape so as to overlap the stator core 10 and the plurality of tip portions 10 c of the stator core 10, and so as to overlap the plurality of tip portions 10 c. A sheet-like insulating substrate 41 superimposed on the upper surface of the stator core 10.
In the stator core 10 of the present embodiment, as shown in FIGS. 18 and 19, a first wiring pattern 42 having connection pads 42 a at both ends along a circumferential direction centered on the axis L has a plurality of tip portions. 10c is respectively patterned.
As shown in FIG. 17, the coil 11 includes a conductive wire 14 wound around the tooth 10 b, and at least an end portion of the conductive wire 14 is electrically connected to the connection pad 42 a of the first wiring pattern 42. Has been. The coils 11 function as a U phase, a V phase, and a W phase, respectively.

  Incidentally, as shown in FIGS. 18 and 19, the first wiring pattern 42 is patterned so that the three-stage position is shifted in the radial direction toward the axis L. That is, the first wiring pattern 42 is formed as close as possible to the core back 10a side at the tip 10c of the tooth 10b (the tooth indicated by the arrow F) around which the coil 11 functioning as the U phase is wound. . On the other hand, the first wiring pattern 42 is formed at a position closer to the axis L than before in the tip portion 10c of the tooth 10b (the tooth indicated by the arrow G) around which the coil 11 functioning as the V phase is wound. Yes. A first wiring pattern 42 is formed at a position closer to the axis L at the tip 10c of the tooth 10b (tooth indicated by arrow H) around which the coil 11 functioning as the W phase is wound.

  Further, on the back surface of the insulating substrate 41, as shown in FIG. 20, connection pads 42 a corresponding to the coils 11 are connected to each other so that the coils 11 are connected in a predetermined combination when superimposed on the stator core 10. A second wiring pattern 43 to be electrically connected is patterned. Specifically, the second wiring pattern 43 is similarly patterned in a state where the position is shifted in three steps in the radial direction, corresponding to the connection pad 42a which is shifted in three steps in the radial direction. The connection pads 42a are electrically connected so that each coil 11 functions as a phase, a V phase, and a W phase.

Here, focusing on only one of the three phases (for example, the U phase), a combination of the conductive wire 14, the first wiring pattern 42, and the second wiring pattern 43 will be described.
First, as shown in FIG. 21, the conductive wire 14 is wound around the first tooth 10b (indicated by the arrow A) in a state of being neatly aligned from the core back 10a side toward the tip portion 10c. At this time, the end portion of the conductive wire 14 which has been wound is electrically connected to the connection pad 42a of the first wiring pattern 42 formed at the tip portion 10c.

  Similarly, another conductive wire 14 is connected to the tip portion from the core back 10a side to the second tooth 10b (indicated by an arrow B) disposed at a position two spaces from the first tooth 10b. It is wound in a state of being neatly aligned toward 10c. At this time, the end of the winding lead 14 is electrically connected to the connection pad 42a of the first wiring pattern 42 formed at the tip 10c. Then, the conductive wire 14 that has finished winding the second tooth 10b and has reached the core back 10a becomes a crossover on the core back 10a, and is arranged at a position spaced by two from the second tooth 10b. It is constructed toward the third tooth 10b. The conductive wire 14 reaching the third tooth 10b is wound around the tooth 10b from the core back 10a side toward the tip portion 10c, and then connected to the first wiring pattern 42 formed on the tip portion 10c. It is electrically connected to the pad 42a.

  By the way, since the insulating substrate 41 on which the second wiring pattern 43 is formed is overlaid on the upper surface of the stator core 10, as shown in FIG. 22, the connection pad 42a of the first tooth 10b and the second pad The wiring pattern 43 is electrically connected. The second wiring pattern 43 is also electrically connected to the connection pad 42a of the second tooth 10b. Thereby, the coil 11 wound around the first tooth 10 b and the coil 11 wound around the second tooth 10 b are connected via the first wiring pattern 42 and the second wiring pattern 43. It will be in an electrically conductive state.

  In addition, the coil 11 wound around the second tooth 10b and the coil 11 wound around the third tooth 10b are directly connected by the conducting wire 14, and thus are electrically connected. . The second wiring pattern 43 connected to the connection pad 42a formed at the tip portion 10c of the third tooth 10b is patterned so as to be connected to the ground connection pad 43a functioning as a common ground terminal. .

  As described above, the three coils 11 are electrically connected via the first wiring pattern 42 and the second wiring pattern 43, and function as the U phase. Similarly, the remaining six teeth 10b are wound with the conductive wire 14 in combination with the first wiring pattern 42 and the second wiring pattern 43 to form the remaining two-phase (V-phase, W-phase) coils 11. It is supposed to function. In addition, the conducting wire 14 of the coil 11 that functions as each phase is electrically connected to a three-phase AC power source (not shown).

  Even in the stator 40 configured as described above, the number of layers of the coil 11 can be changed to an odd number, and it is not necessary to fold back to the core back 10a side while traversing the conducting wire 14 in the air as in the prior art. . Accordingly, the same operational effects as those of the first embodiment can be obtained. As in the third embodiment, since the insulating substrate 41 is a thin sheet, it does not affect the thickness reduction.

  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 each of the above embodiments, the stator core 10 formed with nine teeth 10b has been described as an example, but the number of teeth 10b is not limited to this case. Further, although the hub 4 is rotatably supported by the fluid dynamic pressure bearing portion 3, it may be a bearing portion that simply supports the fluid pressure without using the dynamic pressure.

In each of the above embodiments, the spindle motor 2 is described as an inner rotor type. However, the present invention is not limited to this, and an outer rotor type may be used. Here, the form at the time of applying the spindle motor 2 of 1st Embodiment to an outer-rotor type is demonstrated easily with reference to drawings.
As shown in FIG. 23, the recording medium driving device 50 in this case is disposed so as to face the permanent magnet 5 inside the permanent magnet 5 and the permanent magnet 5 disposed so as to surround the periphery of the stator 6. The permanent magnet 5 is configured to rotate about the axis L outside the stator 6. The permanent magnet 5 is held by a flange portion 4 b of the hub 4 that extends beyond the stator 6 to the outside of the stator 6. In addition, the structure of the hub 4 other than this and the structure of the fluid dynamic pressure bearing part 3 are the same as that of 1st Embodiment.

  The stator core 10 is formed such that the teeth 10b fixed to the core back 10a extend radially outward, and the tips of the teeth 10b are opposed to the inner peripheral surface (peripheral surface) of the permanent magnet 5. It becomes part 10c. The stator core 10 is fixed on the base 8 in a state of being arranged so as to surround the sleeve 7.

  The recording medium driving device 1 configured in this way is different in that the permanent magnet 5 rotates on the outside of the stator 6 and can achieve the same operational effects as in the first embodiment except for that point. In particular, since the flange portion 4b of the hub 4 can be formed long, the hard disk D can be held more stably, and rotation stability can be improved and vibration can be reduced. In addition, although the case where the spindle motor 2 of the first embodiment was applied to the outer rotor type was described as an example, the spindle motor 2 of other embodiments can be applied to the outer rotor type. is there.

1 is a cross-sectional view illustrating a recording medium driving device according to a first embodiment of the present invention. FIG. 2 is a top view of a stator constituting the recording medium driving device shown in FIG. 1. It is a top view of the stator core which comprises the stator shown in FIG. FIG. 4 is a partially enlarged view of the stator core shown in FIG. 3. It is a figure which shows the state which wound the conducting wire around three teeth of the stator core shown in FIG. 3, and comprised the coil which functions as a U phase. FIG. 6 is a partially enlarged view of the stator core shown in FIG. 5. FIG. 7 is a cross-sectional arrow view DD shown in FIG. 6. It is a cross-sectional arrow FF figure shown in FIG. It is a top view which shows the stator of 2nd Embodiment which concerns on this invention. FIG. 10 is a top view of a stator core constituting the stator shown in FIG. 9. FIG. 11 is a partially enlarged view of the stator core shown in FIG. 10. It is a figure which shows the state which wound the conducting wire around three teeth of the stator core shown in FIG. 10, and comprised the coil which functions as a U phase. It is a figure which shows the modification of the combination of a conducting wire and a wiring pattern, Comprising: When constructing a coil, the conducting wire is wound from the core back side to the tip, and one end of the winding pattern is connected to the end of the winding It is a figure which shows the state connected to the part. It is a top view which shows the stator of 3rd Embodiment which concerns on this invention. FIG. 15 is an exploded perspective view of the stator shown in FIG. 14. It is a figure which shows the state which wound the conducting wire around three teeth of the stator core shown in FIG. 14, and comprised the coil which functions as a U phase. It is a top view which shows the stator of 4th Embodiment which concerns on this invention. It is a top view of the stator core which comprises the stator shown in FIG. FIG. 19 is a partially enlarged view of the stator core shown in FIG. 18. FIG. 18 is a top view of an insulating substrate constituting the stator shown in FIG. 17. It is a disassembled perspective view which shows the state which wound the conducting wire around three teeth of the stator core shown in FIG. 18, and comprised the coil which functions as a U phase. It is the figure which showed the relationship between a conducting wire, a 1st wiring pattern, and a 2nd wiring pattern when the coil which functions as a U phase was comprised. FIG. 6 is a diagram showing a modification of the recording medium driving device according to the present invention, and is a cross-sectional view of a recording medium driving device having an outer rotor type spindle motor. It is sectional drawing which shows an example of the conventional recording-medium drive device. FIG. 25 is a top view of a stator constituting the recording medium driving device shown in FIG. 24. It is a cross-sectional arrow JJ figure shown in FIG.

Explanation of symbols

D: Hard disk (recording medium)
L ... Axis 1, 50 ... Recording medium drive device 2 ... Spindle motor (motor)
3 ... Fluid dynamic pressure bearing (bearing)
4 ... Hub (shaft)
4c ... fitting part (holding part)
5 ... Permanent magnets 6, 20, 30, 40 ... Stator 10 ... Stator core 10a ... Core back (annular part)
10b ... Teeth (tooth part)
DESCRIPTION OF SYMBOLS 10c ... Tip part 11 ... Coil 12 ... Wiring pattern 12a ... One connection pad 12b ... The other connection pad 31, 41 ... Insulating substrate 42 ... 1st wiring pattern 42a ... Connection pad 43 of 1st wiring pattern 43 ... 1st 2 wiring pattern

Claims (6)

A stator disposed opposite to a permanent magnet rotating around an axis,
An annular portion formed in an annular shape around the axis, and a base end fixed to the annular portion, and formed to extend in a radial direction toward the permanent magnet at every predetermined angle centered on the axis. A stator core having a plurality of tooth pole portions, and a tip portion formed at each of the tip ends of the plurality of tooth pole portions and facing the peripheral surface of the permanent magnet,
With the connection pads at both ends, patterning is performed on the top surface of the stator core so as to follow each of the plurality of tooth pole portions, and one connection pad is disposed on the tip end side, and the other connection pad is A wiring pattern arranged on the annular side,
And a coil wound around the tooth pole portion in a state where at least an end portion of the conducting wire is connected to the one connection pad. A stator disposed opposite to a permanent magnet rotating around an axis,
An annular portion formed in an annular shape around the axis, and a base end fixed to the annular portion, and formed to extend in a radial direction toward the permanent magnet at every predetermined angle centered on the axis. A stator core having a plurality of tooth pole portions, and a tip portion formed at each of the tip ends of the plurality of tooth pole portions and facing the peripheral surface of the permanent magnet,
A sheet-like insulating substrate formed in substantially the same outer shape as the stator core and superimposed on the upper surface of the stator core;
With the connection pads at both ends, patterning is performed on the upper surface of the insulating substrate along each of the plurality of tooth pole portions, and one connection pad is disposed on the tip end side and the other connection pad A wiring pattern disposed on the annular portion side;
A stator comprising: a coil wound around the insulating substrate and the tooth pole portion in a state where at least an end portion of the conducting wire is connected to the one connection pad. The stator according to claim 1 or 2,
The wiring pattern extends along the annular portion so that the other connection pad is disposed in the vicinity of another tooth pole portion different from the tooth pole portion where the one connection pad is disposed. A stator that is patterned. A stator disposed opposite to a permanent magnet rotating around an axis,
An annular portion formed in an annular shape around the axis, and a base end fixed to the annular portion, and formed to extend in a radial direction toward the permanent magnet at every predetermined angle centered on the axis. A stator core having a plurality of tooth pole portions, and a tip portion formed at each of the tip ends of the plurality of tooth pole portions and facing the peripheral surface of the permanent magnet,
A first wiring pattern that is patterned on each of the plurality of tip portions and has connection pads at both ends, along a circumferential direction centered on the axis;
A coil wound around the tooth pole portion in a state where at least an end portion of the conducting wire is connected to the connection pad;
A sheet-like insulating substrate that is formed in a ring shape so as to overlap the plurality of tip portions, and is superimposed on the upper surface of the stator core so as to overlap the plurality of tip portions;
A second wiring pattern that is patterned on the back surface of the insulating substrate and connects the connection pads corresponding to the coils so that the coils are connected in a predetermined combination when the insulating substrates are overlaid; And a stator. The stator according to any one of claims 1 to 4,
And a shaft body supported rotatably around the axis while holding the permanent magnet. A motor according to claim 5;
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 device comprising: a bearing portion that rotatably supports the shaft body around the axis.

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