WO2006022369A1

WO2006022369A1 - Coil winding jig, electromagnet manufacturing method, electromagnet, motor, and recording medium drive device

Info

Publication number: WO2006022369A1
Application number: PCT/JP2005/015521
Authority: WO
Inventors: Hiromitsu Gotoh; Ryoji Yoneyama; Kazuaki Oguchi
Original assignee: Seiko Instruments Inc.
Priority date: 2004-08-26
Filing date: 2005-08-26
Publication date: 2006-03-02
Also published as: JPWO2006022369A1; JP4638875B2

Abstract

There are provided a coil winding jig, an electromagnet manufacturing method, an electromagnet, a motor, and recording medium drive device capable of reducing the thickness of a motor. A status core (24) is formed by laminating a plurality of metal plates (27, 28) and having an annular core back (25) and a predetermined number of tooth electrodes (26). A coil winding jig (50) holds the status core (24) when winding coils (23u, 23v, 23w) on the tooth electrodes (26) of the status core (24). The coil winding jig (50) includes a mounting unit for mounting the status core (24), and a plurality of engaging protrusions (53) arranged on the inner circumference side of the core back (25) and having their tips protruding from the end surface of the core back (25) when the status core (24) is mounted on the mounting unit, for engaging at the outer side of the radial direction a connecting wire (41) electrically connecting between the coils (23u, 23v, 23w).

Description

Specification

Coil winding jig, electromagnet manufacturing method, electromagnet, motor, and recording medium drive device

Technical field

The present invention relates to a coil winding jig, an electromagnet manufacturing method, an electromagnet, a motor, and a recording medium driving device.

Background art

Recently, an information recording / reproducing apparatus using a hard disk drive apparatus (hereinafter referred to as “HDD” t) has begun to spread to portable music reproducing apparatuses, mobile phones and the like. Such information recording / playback devices are required to be further downsized, and HDDs are also becoming smaller. Under these circumstances, spindle motors that drive HDDs are also required to be small and thin.

[0003] The above-described spindle motor is provided with an electromagnet including a plurality of coils supplied with a three-phase alternating current and a stator core formed by stacking a plurality of metal plates. In addition, on one surface of the stator core, a connecting wire that is a conductive wire for electrically connecting the coils is wired. If this crossover wire moves freely, problems such as unwinding of the coil winding occur, so the crossover wire is locked to the stator core.

[0004] As a method of locking such a jumper, a method is known in which a resin plate having a locking projection is arranged on one surface of the stator core and the jumper is locked to the locking projection. It has been. However, in order to reduce the thickness of the spindle motor, the thickness of the resin board is an extra dimension. Therefore, there is a technology for reducing the thickness of the stator core, that is, the spindle motor, by eliminating the above-mentioned resin plate and bending the metal plate constituting the stator core to form a crossover locking portion. Proposed (see, for example, Patent Document 1) ₀ Patent Document 1: JP 2001-119871 (FIG. 6, page 4, etc.)

Disclosure of the invention

[0005] In Patent Document 1 described above, the crossover locking portion is formed by bending so that one surface force of the stator core protrudes. However, the crossover locking portion is formed in this way. As a result, there is a problem that it is difficult to further reduce the thickness of the spindle motor because the reduction of the dimension in the thickness direction of the stator core, that is, the reduction in thickness is limited.

[0006] As another method for reducing the thickness of the stator core, a method of reducing the number of metal plates constituting the stator core is conceivable.

However, if the number of the metal plates is reduced while the force is applied, there is a possibility that a problem may occur when the coil is wound around the stator core. That is, when winding the coil, the stator core is held by the fixing jig. When the stator core is held, a part of the fixing jig is pressed against the stator core in the radial direction. If the number of the metal plates is reduced, the rigidity of the stator core is lowered. Therefore, the stator core is deformed in the surface direction by the pressing force of the fixing jig, and the coil cannot be wound normally. There was a fear.

As a result, when a coil having a predetermined number of turns is formed, the thickness of the coil increases, which makes it difficult to reduce the thickness of the spindle motor. Or there was a problem that the coil could not be formed and the spindle motor could not be manufactured.

[0007] The present invention has been made to solve the above-described problem, and is a coil winding jig, a method for manufacturing an electromagnet, an electromagnet, a motor, and a recording medium driving device capable of reducing the thickness of the motor. The purpose is to provide.

In order to achieve the above object, the present invention provides the following means.

The coil winding jig of the present invention is formed by laminating a plurality of plates made of metal, and is used when winding a coil around the tooth poles of a stator core having an annular core back and a predetermined number of tooth poles. A coil winding jig for holding the stator core, wherein the stator core is placed on the circumferential surface side of the core back when the stator core is placed on the placement portion. A plurality of locking projections that are arranged in a state in which the end surface force of the core back protrudes and the connecting wire that electrically connects the coils is locked radially outward. And

[0009] According to the present invention, the coil can be formed on the tooth pole without providing the stator core with a member for locking the crossover. As a result, the stator core can be reduced in thickness, and the electromagnet, motor, and recording medium driving apparatus using the stator core can be reduced in thickness. Specifically, one coil is formed on one tooth pole of the stator core, the connecting wire is locked to the locking protrusion on the radially outer side, and another coil is formed on the other tooth pole. Thus, coils can be formed on all tooth poles. Therefore, it is not necessary to provide a member for locking the crossover wire on the stator core.

In addition, the crossover is arranged through the vicinity of the circumferential surface of the core back and the vicinity of the end surface of the coil in the radial direction. Therefore, even if the stator core is removed from the jig force of the present invention after all the coils are formed, play is generated in the jumper wire. As a result, there is no need to lock the crossover after forming the coil, and there is no need to provide a member for locking the crossover on the stator core.

[0010] In the above invention, it is desirable that at least a part of the locking projection abuts on a circumferential surface of the core back to hold the stator core in the radial direction.

According to the present invention, by using a part of the locking projections and pressing and holding the circumferential surface of the core back radially outward or radially inward, the stator core having low rigidity is not deformed. It can be held in the radial direction.

For example, a low-stiffness stator core with a small number of plates constituting the stator core can be held without being deformed, and a coil can be stably formed on the tooth poles of the stator core. Therefore, by using the coil winding jig of the present invention, it is possible to reduce the thickness of the electromagnet, the motor, and the recording medium driving device using the stator core and the coil.

[0011] In the above invention, it is desirable that at least one force of the locking projection is fitted to a recess formed on the circumferential surface of the core back.

According to the present invention, the relative phase relationship between the stator core and the coil winding jig can be fixed, and a plurality of coils in the stator core can be specified. For this reason, even when the formed coil has a defect, it is possible to identify the force with which the coil wound in which order was defective, and to easily take measures against the defect.

[0012] The electromagnet manufacturing method of the present invention includes an annular core back formed by laminating a plurality of metal plates, a stator core having a predetermined number of tooth poles, and the tooth poles. A method for manufacturing an electromagnet having a coil, the coil winding jig of the present invention The stator core is mounted on the mounting portion, and one coil is formed on one tooth pole, and then a crossover is locked on the locking protrusion, and another coil is formed on the other tooth pole. Features.

[0013] According to the present invention, it is possible to form a coil by winding a wire around a tooth pole without providing a member for locking the crossover wire on the stator core. As a result, the thickness of the stator core can be reduced, and the electromagnet, motor, and recording medium driving apparatus using the stator core can be reduced in thickness.

In addition, a region near the circumferential surface of the core back is included in a part of the wiring path from one core of the crossover line to the other core. Therefore, even if the stator core is removed from the jig force according to the present invention after all the coils are formed, it is possible to make play less likely to occur in the jumper wire. As a result, it is not necessary to lock the crossover wire after forming the coil, and it is not necessary to provide a member for locking the crossover wire to the stator core.

[0014] The electromagnet of the present invention includes an annular core knock formed by laminating a plurality of metal plates and a stator core having a predetermined number of tooth poles, and a coil formed on the tooth poles. An electromagnet having a connecting wire for electrically connecting the coil, wherein the coil is formed using the coil winding jig of the present invention, and at least 1 of the circumferential surface of the core back. A recess is formed at the location, and the crossover is passed so as to pass through a region near the outside of the recess.

[0015] According to the present invention, since there is no crossover locking member on the stator core, the electromagnet can be made thin.

Specifically, by forming one coil on one tooth pole of the stator core, locking the connecting wire to the locking projection, and forming another coil on the other tooth pole, all the teeth A coil can be formed on the pole. Therefore, it is not necessary to provide a member for locking the crossover wire on the stator core.

In addition, since the area around the circumferential surface of the core back is included in a part of the wiring path from the one core to the other core of the connecting line, play can be generated in the connecting line. As a result, it is not necessary to lock the crossover after forming the coil, and it is not necessary to provide a member for locking the crossover on the stator core.

Moreover, the circumferential phase in the stator core of the tooth pole can be specified by the recess. The For this reason, even if there is a defect in the coil formed on the tooth pole, it is possible to identify the number of the coil wound in which position is defective, thus facilitating countermeasures.

[0016] A motor of the present invention includes an electromagnet formed by the electromagnet manufacturing method of the present invention, or a stator that supports the electromagnet of the present invention, and a shaft body that supports a permanent magnet. The shaft body is rotatably supported by the stator, and the stator and the shaft body are relatively driven to rotate by the electromagnet and the permanent magnet.

According to the present invention, the electromagnet itself can be thinned by using the electromagnet formed by the electromagnet manufacturing method of the present invention or the electromagnet of the present invention, thereby reducing the thickness of the motor. Can be planned.

[0017] A recording medium driving apparatus of the present invention includes the motor of the present invention, and is characterized in that a fixing portion for fixing the recording medium medium is provided on the shaft body.

According to the present invention, by using the motor of the present invention, the motor can be thinned, and the recording medium driving device can be thinned.

[0018] According to the coil winding jig, the electromagnet manufacturing method, the electromagnet, the motor, and the recording medium driving device of the present invention, the coil is formed on the tooth pole without providing the stator core with a member for locking the crossover wire. can do. Therefore, the stator core, the electromagnet using the stator core, the motor using the electromagnet, and the recording medium driving device can be thinned as much as the locking member is not provided on the stator core.

Brief Description of Drawings

FIG. 1 is a cross-sectional view showing an embodiment of a recording medium driving device according to a first embodiment of the present invention.

2 is a plan view showing an electromagnet of the recording medium driving device in FIG. 1. FIG.

FIG. 3 is a view showing a coil winding jig for holding and fixing the stator core of FIG. 2.

4 is a view showing a state in which the stator core is held and fixed to the coil winding jig of FIG.

FIG. 5 is a diagram showing a positional relationship between a stator core and a nozzle when winding a first coil.

FIG. 6 is a diagram showing a positional relationship among a stator core, a nozzle, and a crossover when winding a second coil. FIG. 7 is a diagram showing a positional relationship between a tooth pole of a stator core and a nozzle.

FIG. 8 is a plan view showing an electromagnet of a recording medium driving device in a second embodiment of the present invention.

FIG. 9 is a plan view showing an electromagnet of a recording medium driving device according to a third embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment]

A stator core, a motor including a stator core, and a recording medium driving apparatus including the motor according to a first embodiment of the present invention will be described with reference to FIGS. The motor 10 according to the present embodiment is applied to the recording medium driving device 1 shown in FIG. The recording medium driving device 1 includes a motor 10 that rotationally drives the recording medium HD.

The motor 10 includes a stator 11 including an electromagnet 20 arranged in an annular shape, a rotor (shaft body) 12 including a permanent magnet 14 disposed inside the stator 11 and opposed to the electromagnet 20, and the stator 11. And a fluid dynamic pressure bearing 13 that rotatably supports the rotor 12. The rotor 12 is rotationally driven with respect to the stator 11 by the magnetic force acting between the electromagnet 20 provided in the stator 11 and the permanent magnet 14 provided in the rotor 12.

[0021] The permanent magnet 14 is formed in an annular shape and has a rectangular cross section.

The rotor 12 formed in a cup shape is formed on a flange 15 formed in a bowl shape from the outer periphery of the side wall of the rotor 12, a yoke 16 holding the permanent magnet 14 together with the flange 15, and a center axis of the rotor 12. A fitting hole 17 for fitting with a shaft 31 to be described later, and a fitting portion (fixed portion) 18 for fitting a ring plate-like recording medium HD are formed.

[0022] When the recording medium HD is fitted into the fitting portion 18 of the rotor 12, the rotor 12 and the recording medium HD are integrally configured. Further, the rotor 12 and the shaft 31 are integrally configured by fitting one end of the shaft 31 into the fitting hole 17 of the rotor 12. Therefore, the shaft 31, the rotor 12, and the recording medium HD are configured to rotate together.

A boss portion 19 is formed on the stator 11 substantially on the central axis of the electromagnet 20. Boss part 1 9 is fitted with a housing 32 of a fluid dynamic bearing 13 described later, whereby the permanent magnet 14 provided in the rotor 12 is disposed opposite to the electromagnet 20.

A shield plate 21 is disposed between the electromagnet 20 and the recording medium HD to block the magnetic field formed by the electromagnet 20 and the permanent magnet 14. The shield plate 21 is also formed with a disk force in which a hole through which the rotor 12 is passed is formed at substantially the center. The shield plate 21 is formed so that its inner peripheral end face is opposed to the flange 15 of the rotor 12 with a predetermined distance, and is fixed to the outer peripheral end face force stator 11. Te! The predetermined interval between the shield plate 21 and the flange 15 is an interval at which the shield plate 21 and the flange 15 do not contact when the rotor 12 rotates, and the magnetic flux leaks outward from the shield plate 21. This is an interval that can reduce the amount of.

[0024] Further, the stator 11 is formed with a stator opening 22 for accommodating a coil 23 of an electromagnet 20 described later. By accommodating the coil 23 in the stator opening 22 in this manner, the arrangement position of the electromagnet 20 can be made closer to the stator 11 side (lower in the figure), and the recording medium driving device 1 can be made thinner. it can.

An electromagnet 20 shown in FIG. 2 is the electromagnet 20 applied to the motor 10 and the recording medium driving apparatus 1 of the present embodiment.

As shown in FIGS. 1 and 2, the electromagnet 20 includes a coil 23 that generates an alternating magnetic field when supplied with a three-phase alternating current, and two pieces of silicon having a thickness of approximately 0.2 mm around which the coil 23 is wound. The stator core 24 also has a metal plate force such as a steel plate.

Note that the thickness of the metal plate constituting the stator core 24 may be approximately 0.2 mm as described above, or may be about 0.15 mm which is thinner, and is not particularly limited.

As shown in FIG. 2, the stator core 24 includes an annular core back 25 and a plurality of tooth poles 26 extending radially inward from the core back 25. The distal end portion 26 a radially inward of the tooth pole 26 is formed so that the circumferential length is longer than the outer portion of the tooth pole 26. The coil 2 3 is wound around the tooth pole 26. On the inner peripheral surface of the core back 25, a substantially semicircular recess 25a is formed substantially in the middle of the tooth pole 26. In addition, an I mark 24 m that defines the phase of the stator core 24 is formed on the outer peripheral surface of the core back 25.

[0027] The stator core 24 includes a first plate (plate body) 27 on the recording medium HD side and a second plate on the stator 11 side. The first plate 27 and the second plate 28 are overlapped with each other.

The stator core 24 may be formed of two plates as described above, may be formed by stacking more plates, or conversely formed by a single plate force. It can be anything.

[0028] At the tip in the radial direction of the tooth pole 26 of the first plate 27, a facing portion (folded portion) 29 that is bent toward the recording medium HD and faces the permanent magnet 14 is formed. The facing portion 29 is formed such that the distance from the outer peripheral side end surface of the permanent magnet 14 is constant in the axial direction (vertical direction in FIG. 1). Further, as shown in FIG. 2, the facing portion 29 is formed so that the distance from the outer peripheral side end surface of the permanent magnet is constant also in the circumferential direction.

The stator core 24 is arranged so as to be positioned substantially on or above the same surface as the upper end force of the opposing portion 29 of the first plate 27 and the upper end of the permanent magnet 14.

The upper end of the facing portion 29 of the first plate 27 is arranged on the same plane as or higher than the upper end of the permanent magnet 14, and the lower end of the second plate 28 is the lower end of the permanent magnet 14. It may be arranged on the same plane or below the same plane.

[0030] Note that, as described above, the facing portion 29 of the stator core 24 may be formed such that the distance from the outer peripheral side end surface of the permanent magnet 14 in the circumferential direction is constant, and the distance is It may be formed so as to be non-uniform. For example, by increasing the circumferential curvature of the facing portion 29, the distance between the opposing portions 29 in the circumferential direction and the permanent magnet 14 is larger than the spacing between the facing portion 29 and the permanent magnet 14 at the substantially central portion. It may be wide.

By adopting such a configuration, the periodicity of the attractive force between the permanent magnet 14 and the electromagnet 20 becomes weak, and the cogging torque of the motor can be reduced.

[0031] The coil 23 can be divided into a coil 23u supplied with the U phase of the three-phase alternating current, a coil 23v supplied with the V phase, and a coil 23w supplied with the W phase. The coils 23u, 23v, 23w are sequentially arranged in the circumferential direction.

Further, each coinlet 23u, 23v, 23w is electrically connected by a crossover 41. For example, the crossover 41 is arranged so as to connect the coil 23u and the adjacent coil 25a via two recesses 25a. Specifically, the connecting wire 41 is passed through the outer region of the recess 25a. The crossover line 41 is passed so that the outer region force also passes through the outer region of the adjacent recess 25a, and also passes between the outer region and one of the adjacent coils 23u, 23v, 23w.

As shown in FIG. 1, the fluid dynamic pressure bearing 13 is also configured with a shaft 31, a housing 32 that accommodates the shaft 31, and a force. The shaft 31 includes a substantially cylindrical shaft body 33 and a flange-shaped thrust bearing plate 34 that extends in the radial direction over the entire outer periphery of the shaft body 33 at an intermediate position in the axial direction of the shaft body 33. The housing 32 has an inner surface arranged with a small gap with respect to each outer surface of the shaft 31. Oil F is filled in the gap between the inner surface of the housing 32 and the outer surface of the shaft 31.

The shaft body 33 and the thrust bearing plate 34 are integrally formed to form a shaft 31. A plurality of radial dynamic pressure grooves called herringbone grooves are formed on the outer peripheral surface of the lower end (lower end in FIG. 1) of the shaft 33. A plurality of thrust dynamic pressure generating grooves called herringbone grooves are formed on both end faces of the thrust bearing plate 34 in the thickness direction.

The housing 32 has a substantially cylindrical housing body 35 with one end closed and the other end opened, and an upper end that closes the open end of the housing 32 with one end of the shaft body 33 protruding. Plate 36 and force are also configured. The housing body 35 is formed with a radial portion accommodating hole 37 for accommodating the lower end side of the shaft body 33 in which a radial dynamic pressure generating groove is formed, and a thrust portion accommodating hole 38 for accommodating the thrust bearing plate 34. ing.

The upper plate 36 is formed in a ring plate shape, and a through hole 39 through which the shaft body 33 is passed is formed in the approximate center of the ring plate. The through hole 39 is formed so that the inner peripheral surface thereof becomes a tapered surface whose diameter gradually increases from the thrust portion receiving hole 38 toward the outside. As a result, an annular cylindrical seal whose space is widened outwardly is formed between the outer peripheral surface of the shaft body 33 passed through the through hole 39 and the inner peripheral surface of the through hole 39. Depending on the shape and surface tension of the oil, the canary seal can be held so that the oil F filled between the housing 32 and the shaft 31 does not leak outside.

[0037] Next, a method for manufacturing the electromagnet 20 of the recording medium driving device 1 having the above-described configuration, specifically, a process of winding the coils 23u, 23v, 23w around the tooth poles 26 of the stator core 24 will be described. To do.

First, the coil winding jig 50 used when winding the coils 23u, 23v, 23w around the tooth pole 26 will be described.

3 is a diagram for explaining the coil winding jig 50 for holding and fixing the stator core 24. The coil winding jig 50 is a jig for holding and fixing the stator core 24 when winding the coils 23u, 23v, and 23w. It is.

As shown in FIG. 3, the coil winding jig 50 includes a substantially cylindrical support base 51, and a locking pin (locking protrusion) 53 formed on the upper end surface (mounting portion) 52 of the support base 51. It is roughly composed of

The radius of the outer peripheral surface of the support base 51 is formed substantially the same as the outer peripheral diameter of the stator core 24, and the radius of the inner peripheral surface is formed substantially the same as the inner peripheral diameter of the core back 25. Further, the upper end surface 52 of the support base 51 is formed in a flat surface so that the core back 25 can be disposed.

The locking pins 53 are arranged at equal intervals on the upper end surface 52 and are arranged in the same number as the tooth poles 26 of the stator core 24. Further, the locking pin 53 is formed in a semi-cylindrical shape having a diameter of about 0.4 mm, and the flat side surface thereof is arranged so as to coincide with the inner peripheral surface of the support base 51. Further, a taper surface 54 is formed on the semicircular side surface of the locking pin 53 so that the locking pin 53 is thinned by applying a force to the tip.

The locking pin 53 may be formed in a semi-cylindrical shape as described above, or may be formed in a cylindrical shape, and the shape is not particularly limited.

Next, the coil winding process using the coil winding jig 50 will be described.

FIG. 4 is a diagram for explaining a state in which the stator core 24 is held and fixed to the coil winding jig 50.

First, as shown in FIG. 4, the stator core 24 is arranged and held on the upper end surface 52 (see FIG. 3) of the coil winding jig 50. At this time, the tapered surface 54 of the locking pin 53 and the concave portion 25 a first come into contact with each other, and the stator core 24 is guided to a predetermined position on the coil winding jig 50 along the tapered surface 54. Further, since the locking pin 53 and the recess 25a are fitted together, the stator core 24 is held so as not to move in both the radial direction and the circumferential direction. [0040] The gap between the engagement between the locking pin 53 and the recess 25a is at least one, preferably three or more, and the gap is wide enough to hold the stator core 24 to the coil winding jig 50 with a predetermined accuracy. It is desirable that In addition, it is desirable to hold the stator core 24 on the coil winding jig 50 by pressing the recess 25a radially outward by at least three locking pins 53.

The phase of the stator core 24 may be determined by fitting the locking pin 53 and the recess 25a, and the phase determination protrusion (not shown) of the I mark 24m of the stator core 24 and the coil winding jig 50 ) And will be decided by fitting.

FIG. 5 is a view for explaining the positional relationship between the stator core 24 and the nozzle 61 when the first coil 23 u is wound around the tooth pole 26.

When the stator core 24 is disposed in the coil winding jig 50, as shown in FIG. 5, a nozzle 61 of a coil winding device (not shown) is inserted between the tooth poles 26, and for example, the coil 23u is inserted.

For example, the nozzle 61 is driven and controlled in the vertical direction (perpendicular to the paper surface in the figure), and the status core 24 is driven and controlled in the left and right direction (left and right direction in the figure), so that the copper wire can Winding coil 23u is formed.

In addition, here, the coils 23v and 23w supplied with the force V phase and W phase, which are applied to the coil 23u supplied with the three-phase alternating current U phase, are similarly formed.

[0042] The nozzle 61 is inserted to the root of the tooth pole 26 (radially outward) substantially parallel to the tooth pole 26, and then winds the coil 23u toward the tip of the tooth pole 26 (radially inward). When it reaches the tip, it repeats the action of winding the coil 23u with the tip force directed toward the root. Therefore, the coil 23u is formed from an even number of layers of aligned winding, and in the present embodiment, description will be made by applying to a four-layer aligned winding coil.

The coil 23u is wound several times on the fifth layer, and the base thickness of the coil 23u is one layer thicker than the other parts.

With such a configuration, it is possible to make it difficult for the crossover wire 41 wired in the vicinity of the end face on the radially outer side of the coil 23u to ride on the coil 23u.

[0043] FIG. 6 shows the positions of the stator core 24, the nozzle 61, and the crossover 41 when the second coil 23u is wound. It is a figure explaining a positional relationship.

When one coil 23u is wound, the nozzle 61 skips the two tooth poles 26 and forms the coil 23u on the third tooth pole 26 as shown in FIG.

When the two tooth poles 26 are blown, the nozzle 61 is driven and controlled to pass through the outside of the three locking pins 53. Therefore, the crossover wire 41 that electrically connects the two coils 23u is locked by the two locking pins 53, and is arranged so as not to cross the region around which the coils 23v and 23w are wound.

Similarly, the third coil 23u is skipped by the two tooth poles 26 and wound around the third tooth pole 26, and the formation of the coil 23u is completed.

The coils 23v and 23w are wound around the tooth pole 26 in the same manner as the coil 23u, and the process of winding the coils 23u, 23v and 23w around the tooth pole 26 of the stator core 24 is completed.

By using the coil winding jig 50 described above, the coils 23 u, 23 v, 23 w can be formed on the tooth pole 26 without providing a member for locking the crossover wire 41 on the stator core 24. As a result, the stator core 24 can be thinned, and the electromagnet 20, the motor 10, and the recording medium driving device 1 using the stator core 24 can be thinned.

Further, the crossover wire 41 is arranged through the vicinity of the inner peripheral surface of the core back 25 and the vicinity of the outer end surfaces of the coils 23u, 23v, and 23w in the radial direction. Therefore, even if the stator core 24 is removed from the coil winding jig 50 after the formation of all the coils 23u, 23v, 23w, play occurs in the connecting wire 41. As a result, a member for locking the crossover wire 41 after forming the coils 23u, 23v, 23w is not required, and a member for locking the crossover wire 41 on the stator core 24 is not required.

[0045] The recess 25a is pressed radially outward by at least three locking pins 53 of the coil winding jig 50, and the stator core 24 is held by the coil winding jig 50. Therefore, the stator core 24 can be held by the coil winding jig 50 without being deformed in the surface direction, and the coils 23u, 23v, and 23w can be formed without damaging the nozzle 61 and the like.

In addition, as shown in FIG. 7 (a), compared to the case where a part B of the stator core 24 is bent to form the bent portion B that locks the crossover wire 41, FIG. As shown, in this embodiment, when the nozzle 61 (width approximately 1. Omm) is inserted to the root of the tooth pole 26, the nozzle 61 and the stator A clearance (gap) with the 24 can be provided.

That is, in the case shown in FIG. 7 (a), since it is necessary to form a clearance between the bent portion B protruding from the core back 25, the nozzle 61 is arranged close to the tooth pole 26 side. . For this reason, the clearance between the nozzle 61 and the tip 26a of the tooth pole 26 was narrowed to 0.05 mm.

In contrast, in the present embodiment shown in FIG. 7 (b), the locking pin 53 does not protrude from the core knock 25, or even if it protrudes, the amount of protrusion is small, so the nozzle 61 is spaced from the tooth pole 26. (0.15mm) can be placed with a gap. As a result, the circumferential length L of the tip portion 26a can be increased.

If the circumferential length L of the front end portion 26a can be increased, the cogging torque of the motor 10 and the recording medium driving device 1 can be reduced.

[0048] Note that the locking pin 53 may be disposed at a position where it is fitted to the recess 25a formed in the core back 25 as described above, or is in contact with the inner peripheral surface of the core back 25. Alternatively, it may be arranged inward of the inner peripheral surface. In this case, the recess 25a may not be formed. The phase of the stator core 24 can be determined using the I mark 24m.

The locking pin 53 may be fixedly disposed on the coil winding jig 50 as described above, or after the coil is wound on the tooth pole 26 by one to two layers, the locking pin 53 May be evacuated radially inward.

By adopting the configuration as described above, the length of the wiring path of the crossover 41 can be further shortened. As a result, the play of the connecting wire 41 when the stator core 24 is removed from the coil winding jig 50 can be reduced.

[Second Embodiment]

Next, a second embodiment of the present invention will be described with reference to FIG.

The basic configuration of the stator core, the motor including the stator core, and the recording medium driving device including the motor is the same as that of the first embodiment, but the configuration of the stator core is different from that of the first embodiment. ing. Therefore, in the present embodiment, only the periphery of the stator core will be described with reference to FIG. 8, and the description of the recording medium driving device and the like will be omitted.

FIG. 8 is a plan view showing an electromagnet of the recording medium driving apparatus in the present embodiment. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG. 8, the electromagnet 120 of the motor 110 in the recording medium driving apparatus 101 of the present embodiment includes a coil 23 that generates an alternating magnetic field when supplied with a three-phase alternating current, and a coil

The stator core 124 on which 23 is rolled and the force are also configured.

As shown in FIG. 8, the stator core 124 is composed of an annular core back 125 and a plurality of tooth poles 26 extending radially inward from the core back 125. Coil 23 has this tooth pole

Get lost in 26!

[0052] On the outer peripheral surface (circumferential surface) of the core back 125, a substantially semicircular recess 125a is formed at a position substantially in phase with the tooth pole 26. It is desirable that the same number of recesses 125a as the tooth poles 26 are formed as described above.

The shape of the recess 125a may be a substantially semicircular shape as described above, and is not particularly limited to a V shape, a U shape, or a U shape.

As described above, the recess 125a may be formed at a position substantially in phase with the tooth pole 26, or may be formed in the core back 125 between the tooth pole 26 and the tooth pole 26. It is not limited.

[0053] The coil 23 can be divided into a coil 23u to which the U phase of the three-phase alternating current is supplied, a coil 23v to which the V phase is supplied, and a coil 23w to which the W phase is supplied. Each coil 23u, 23v,

23w is arranged in order in the circumferential direction.

Further, the coils 23u, 23v, 23w are electrically connected by the crossover wire 141, respectively. The crossover wire 141 is, for example, an adjacent coil 2 via two coils 23u and two recesses 125a.

Arranged to connect 3u.

Specifically, the crossover wire 141 is passed through the outer region of the recess 125a. Crossover

141 is passed so that the outer region force also passes through the outer region of the adjacent recess 125a and passes between the outer region and any of the adjacent coils 23u, 23v, 23w.

[0055] Next, a method of manufacturing the electromagnet 120 of the recording medium driving device 101 having the above-described configuration, specifically, a process of winding the coils 23u, 23v, and 23w around the tooth pole 26 of the stator core 124 will be described. Light up.

First of all, we will explain how to use the toothed poles and jigs for the tooth poles 26u, 23v, 23w.

Similar to the coil winding jig of the first embodiment, the coil winding jig of the present embodiment is roughly composed of a substantially cylindrical support base and a locking pin formed on the upper end surface of the support base. (See Figure 3).

The radius of the outer peripheral surface of the support base is formed substantially the same as the outer peripheral diameter of the stator core 124, and the radius of the inner peripheral surface is formed approximately the same as the inner peripheral diameter of the core knock 125. Further, the upper end surface of the support base is formed into a flat surface so that the core knock 125 can be disposed.

The locking pins are arranged at equal intervals on the upper end surface and are arranged in the same number as the tooth poles 26 of the stator core 124. The locking pin is formed in a semi-cylindrical shape, and is arranged so that its flat side surface coincides with the outer peripheral surface of the support base.

The locking pin may be formed in a semi-cylindrical shape as described above, or may be formed in a cylindrical shape, and the shape is not particularly limited.

[0057] Next, a coil winding process using a coil winding jig will be described.

In the coil winding process, the winding jig to be used and the stator core 124 on which the coil is wound are different from those in the first embodiment. , 23v, 23w, and wiring of the crossover wire 141 are the same as those in the first embodiment, and the description thereof is omitted.

By using the stator core 124 and the coil winding jig described above, the coils 23u, 23v, and 23w can be formed on the tooth pole 26 without providing the stator core 1 24 with a member for locking the crossover wire 141. . As a result, the stator core 124 can be thinned, and the electromagnet 120, the motor 110, and the recording medium driving device 101 using the stator core 124 can be thinned.

[Third Embodiment]

The basic configuration of the stator core, the motor including the stator core, and the recording medium driving device including the motor of the present embodiment is the same as that of the first embodiment. Have different stator core configurations. Therefore, in the present embodiment, only the periphery of the stator core will be described with reference to FIG. 9, and the description of the recording medium driving device and the like will be omitted.

FIG. 9 is a plan view showing an electromagnet of the recording medium driving apparatus in the present embodiment. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG. 9, the electromagnet 220 of the motor 210 in the recording medium driving device 201 of the present embodiment includes a coil 23 that generates an alternating magnetic field when supplied with a three-phase alternating current, and a coil

The stator core 224 where the 23 is turned and the force are also configured.

As shown in FIG. 9, the stator core 224 includes an annular core back 225 and a plurality of tooth poles 26 extending radially inward from the core back 225. Coil 23 has this tooth pole

Get lost in 26!

[0062] A substantially circular through hole (recessed portion) 225a is formed in the center portion of the core back 225 at a position substantially in phase with the tooth pole 26. It is desirable that the number of through holes 225a be the same as the number of tooth poles 26 as described above.

Note that the shape of the through-hole 225a may be substantially circular as described above, or may be substantially rectangular or the like, and is not particularly limited.

As described above, the through hole 225a may be formed at a position substantially in phase with the tooth pole 26, or may be formed in the core back 125 between the tooth pole 26 and the tooth pole 26. There is no particular limitation.

[0063] The coil 23 can be divided into a coil 23u supplied with the U phase of the three-phase alternating current, a coil 23v supplied with the V phase, and a coil 23w supplied with the W phase. The coils 23u, 23v, 23w are sequentially arranged in the circumferential direction.

Further, the coils 23u, 23v, 23w are electrically connected by the crossover wire 141, respectively. For example, the connecting wire 241 is arranged so as to connect the coil 23u and the adjacent coil 23u via two through holes 225a.

[0064] Specifically, the connecting wire 241 is passed through the outer region of the through hole 225a. The crossover wire 241 is passed from the outer region so as to pass through the outer region of the adjacent through hole 225a, and passes between the outer region and any of the adjacent coils 23u, 23v, 23w. As passed.

Next, a method for manufacturing the electromagnet 220 of the recording medium driving device 201 having the above configuration, specifically, a process of winding the coils 23u, 23v, 23w around the tooth pole 26 of the stator core 224 will be described.

The radius of the outer peripheral surface of the support base is formed substantially the same as the outer peripheral diameter of the stator core 224, and the radius of the inner peripheral surface is formed approximately the same as the inner peripheral diameter of the core knock 225. Further, the upper end surface of the support base is formed into a flat surface so that the core knock 225 can be disposed.

The locking pins are arranged at equal intervals on the upper end surface, and the same number as the tooth poles 26 of the stator core 224 are arranged. The locking pin is formed in a cylindrical shape and is disposed at an intermediate position between the outer peripheral surface and the inner peripheral surface.

Next, a coil winding process using the coil winding jig will be described.

In the coil winding process, the winding jig to be used and the stator core 224 on which the coil is wound are different from those in the first embodiment. , 23v, 23w, the wiring of the crossover wire 241 and the like are the same as those of the first embodiment, and the description thereof is omitted.

[0068] By using the stator core 224 and the coil winding jig described above, the coils 23u, 23v, and 23w can be formed on the tooth pole 26 without providing the stator core 2 24 with a member for locking the crossover wire 241. . As a result, the stator core 224 can be thinned, and the electromagnet 220, the motor 210, and the recording medium driving device 201 using the stator core 224 can be thinned.

[0069] It should be noted that the technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, in the above embodiment, the present invention is applied to a recording medium driving device and a recording Although the present invention has been described with reference to the motor of the medium driving device, the present invention is not limited to the recording medium driving device or the like, but can be applied to various other rotary driving devices.

Claims

The scope of the claims

[1] A coil winding treatment for holding a stator core when the coil is wound around a tooth core of a stator core formed by laminating a plurality of plates made of metal and having an annular core back and a predetermined number of tooth poles. Tools,

A placement portion for placing the stator core, and when the stator core is placed on the placement portion, the placement portion is disposed on the circumferential surface side of the core back, and the tip thereof is arranged in a protruding state of the end surface force of the core back. And a plurality of locking projections for locking the connecting wires that electrically connect the coils on the outer side in the radial direction.

[2] The coil winding jig according to [1], wherein at least a part of the locking projection abuts on a circumferential surface of the core back to hold the stator core in a radial direction.

[3] The coil winding jig according to claim 1 or 2, wherein at least one of the locking projections is fitted with a recess formed on the circumferential surface of the core back.

[4] A method for producing an electromagnet having an annular core back formed by laminating a plurality of metal plates and a stator core having a predetermined number of tooth poles, and a coil formed on the tooth poles. There,

The stator core is placed on the placement portion of the coil winding jig according to any one of claims 1 to 3,

After forming one coil on one tooth pole,

The crossover is locked to the locking protrusion,

An electromagnet manufacturing method comprising forming another coil on another tooth pole.

[5] A stator core having an annular core back and a predetermined number of tooth poles formed by laminating a plurality of plates made of metal, a coil formed on the tooth poles, and the coils electrically An electromagnet having a connecting wire to be connected,

The coil is formed using the coil winding jig according to claim 3,

A recess is formed in at least one place on the circumferential surface of the core back,

An electromagnet, wherein the crossover is passed so as to pass through a region near the outside of the recess.

[6] An electromagnet formed by the method of manufacturing an electromagnet according to claim 4, or according to claim 5, A stator that supports the described electromagnet, and a shaft that supports the permanent magnet. The shaft is rotatably supported by the stator, and the stator and the shaft are supported by the electromagnet and the permanent magnet. A motor characterized in that the body is driven to rotate relatively. 7. A recording medium driving apparatus comprising: the motor according to claim 6; and a fixing portion for fixing the recording medium to the shaft body.