JP3974493B2 - Manufacturing method of stator for inner rotor type motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an inner rotor type motor stator core manufacturing method, a lamination used for manufacturing a stator core, and a laminate.
[0002]
[Prior art]
In recent years, the application of a recording disk drive device in which a recording disk is driven to rotate using a motor has been applied to devices such as digital cameras and PDAs that have become more compact and portability is important. It has begun. In that case, naturally, it is required to reduce the diameter of the recording disk. In particular, when adopting a removable recording disk drive device, it is necessary to further reduce the diameter of the recording disk, and accordingly, the motor itself may be reduced in diameter and thickness. There is a strong demand (see, for example, Patent Document 1).
[0003]
On the other hand, in the radial gap type motor, since it is necessary to make the rotor magnet of the rotor and the stator face each other via a radial gap, a certain device is required for reducing the diameter. Therefore, as a radial gap type motor, an inner rotor type (a structure in which a rotor magnet is disposed on the inner peripheral side of the stator core) is employed in order to cope with a recording disk with a reduced diameter. The stator of an inner rotor type motor has a stator core having an annular core back having a circular hole in the vicinity of the center, a plurality of pole teeth extending radially inward from the peripheral surface of the circular hole, and a winding wound around the pole teeth. Line. The stator core is a laminated body in which a plurality of laminations are laminated and fixed to each other by caulking or laser welding. The rotor includes a rotor magnet disposed in the circular hole and facing the pole teeth in the radial direction, and a recording disk mounting portion on which the recording disk is mounted.
[0004]
In this specification, a combination of a stator core and a winding is referred to as a stator body or a stator.
[0005]
[Patent Document 1]
JP 2001-197701 A
[0006]
[Problems to be solved by the invention]
The stator body is usually manufactured as follows. First, an electromagnetic steel plate (for example, a silicon steel plate) is divided into several steps and punched with a press to obtain a desired shape of lamination (forming step). Next, about several laminations are laminated | stacked (lamination process), a caulking process is performed, and a laminated body is formed (adhesion process). Furthermore, an insulating material is painted on the surface of the laminate (insulating process). Finally, when the winding machine chucks the laminate, the winding is wound around the pole teeth of the laminate by several tens of turns (winding step), thereby completing the stator body having the winding wound around the pole teeth.
[0007]
However, as described above, when the diameter and thickness of the entire motor are reduced and the stator core is further reduced in size, it becomes difficult to chuck the laminate with the conventional winding machine. In addition, since the rigidity of the laminated body is lower than that of the conventional structure due to the thinning or the like, the laminated body is bent when the laminated body is chucked in the conventional winding machine.
[0008]
An object of the present invention is to solve the above-described conventional problems and to manufacture a stator body having a miniaturized stator core without any trouble.
[0009]
[Means for Solving the Problems]
A stator core manufacturing method for an inner rotor type motor according to claim 1, comprising: a stator core having an annular core back having a circular hole in the vicinity of the center portion; and a plurality of pole teeth extending radially inward from a peripheral surface of the circular hole; A method of manufacturing a stator for an inner rotor type motor having a winding wound around pole teeth, which includes the following steps.
[0010]
A stator core forming portion corresponding to the stator core, a chuck frame forming portion disposed so as to surround the stator core forming portion, and a connecting arm forming portion for connecting the stator core forming portion and the chuck frame forming portion are integrated. Preparatory process for preparing multiple laminations
◎ Lamination step of laminating a plurality of laminations so that a stator core, a chuck frame and a connecting arm are formed from a stator core forming part, a chuck frame forming part and a connecting arm forming part, respectively.
◎ Winding process of winding the winding around each pole tooth of the stator core while chucking the chuck body of the laminated body
◎ Separation process that breaks the boundary between the stator core after winding and the connecting arm to separate the stator core from the chuck frame
In this inner rotor type motor stator manufacturing method, a laminate chuck frame is held by the winding machine when a winding is wound around each pole tooth of the stator core in the winding process. Therefore, even if the stator core itself is miniaturized, problems such as bending of the stator core during winding are unlikely to occur.
[0011]
The method for manufacturing an inner rotor type motor stator according to claim 2 further includes an insulating step of applying an insulating material to the surface of the laminated body between the laminating step and the winding step. .
In this inner rotor type motor stator manufacturing method, since the insulation process is between the lamination process and the winding process, the coil wire is wound around the insulated pole teeth.
[0012]
In the method for manufacturing a stator for an inner rotor type motor according to claim 3, in claim 1 or 2, the lamination is formed at the boundary between the stator core forming portion and the connecting arm forming portion and has a finer detail for breaking than the connecting arm forming portion. It further has a part.
In this method of manufacturing a stator for an inner rotor type motor, the lamination further has a breaking detail forming portion, so that the breaking details of the laminate are broken in the separation step. Therefore, a large force is not required for breaking in the separation process.
[0013]
In the method for manufacturing an inner rotor type motor stator according to a fourth aspect, in any one of the first to third aspects, the stator core forming portion has a substantially rectangular outer shape. The center of the circular hole is at the center position in the long side direction of the core back, but is shifted from the center position in the short side direction to one side in the short side direction. The core back forms an opening of a circular hole by lacking a long side portion on one side in the short side direction.
[0014]
In this inner rotor type motor stator manufacturing method, since the outer shape of the stator core is rectangular, both sides of the core back in the short side direction, that is, the long side cannot secure a sufficient width in the radial direction. There is a fear. Therefore, the opening of the circular hole is formed by shifting the center of the circular hole from the center position in the short side direction to one side in the short side direction and lacking the long side part on one side in the short side direction. Thereby, the radial direction width | variety of the long side part on the opposite side to a short side direction can fully be ensured, and the function of the part becomes enough. Specifically, a magnetic path that does not cause saturation of the magnetic path can be secured, or a sufficient area of the fixed portion can be secured. As a result, the stator core is reduced in size while ensuring sufficient functions.
[0015]
On the other hand, since the stator core lacks one long side portion, the rigidity is lower than that which is not absent. However, since it is the laminated chuck frame that is held by the winding machine when the winding is wound around each pole tooth of the stator core in the winding process, even if the rigidity of the stator core is low, the winding Problems such as bending of the stator core during wiring are less likely to occur.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
(1) Removable recording disk drive device
FIG. 1 shows a schematic configuration diagram of a removable recording disk drive 1 as a first embodiment of the present invention. The recording disk drive device 1 is a device for holding and rotating the removable recording disk 5 in a detachable manner, and is particularly employed in small devices such as PDAs. The removable recording disk 5 has a diameter of 30 mm or less, and the entire recording disk drive 1 is correspondingly reduced in diameter and thickness. In the description of the present embodiment, the vertical direction of the drawing is referred to as “vertical direction” for convenience, but the direction in the actual mounting state of the recording disk drive device 1 is not limited.
[0024]
The types of removable recording disk 5 include magnetic optical (MO), mini disk (MD), floppy disk (FD), compact disk / read only memory (CD-ROM), compact disk (CD) and digital. Any of versatile discs (DVD) may be used, and other types may be used.
[0025]
The recording disk drive device 1 includes a housing 2 having an opening 2 a, a recording disk drive motor 3 fixed inside the housing 2, and a pickup device for writing or reading information at a required position of the recording disk 5. 4 and a recording disk transport drive device (not shown). In the housing 2, the pickup device 4 is disposed in the vicinity of the opening 2a, and the recording disk driving motor 3 is disposed side by side on the back side. The direction in which the opening 2 a, the pickup device 4 and the recording disk drive motor 3 are arranged is the conveyance direction of the recording disk 5.
[0026]
(2) Configuration of recording disk drive motor
(1) Overall configuration
FIG. 2 is a schematic vertical sectional view of the recording disk driving motor 3, and FIG. 3 is a plan view thereof. In the figure, OO is the rotational axis of the recording disk drive motor 3.
The recording disk drive motor 3 is an inner rotor type three-phase motor, and mainly includes a stator 8 and a rotor 9. Formed between the stator 8 and the rotor 9 are a magnetic circuit portion 41 for applying a rotational force to the rotor 9 and a dynamic pressure bearing 42 for rotatably supporting the rotor 9 on the stator 8.
[0027]
(2) Stator configuration
The stator 8 mainly includes a bracket 12 and a stator body 13 that is provided on the outer peripheral side of the bracket 12 and constitutes a part of the magnetic circuit portion 41.
The bracket 12 is a flat plate-like member in which a center hole 12a is formed, and the outer diameter shape is substantially rectangular. Further, a wall 12b extending upward in the axial direction is formed on the rear side of the bracket 12 in the recording disk conveyance direction. In the bracket 12, the plate-like main body portion and the wall portion 12 b are fixed in contact with the inner wall of the housing 2. An insulating plate 30 is fixed to the upper end surface of the plate-like main body portion of the bracket 12.
[0028]
As shown in FIG. 3, the stator main body 13 includes a stator core 15 and a three-phase winding 16. As shown in FIGS. 4 and 5, the stator core 15 is a laminated body in which silicon steel plates (laminations) pressed into a desired shape are laminated in 3 to 5 layers. The thickness of one silicon steel plate is 0.20 mm, 0.35 mm, 0.50 mm or the like.
[0029]
The stator core 15 has a core back 17 having a substantially rectangular outer shape and a circular hole 19 near the center, and a plurality of pole teeth 18 extending radially inward from the peripheral surface 20 of the circular hole 19. . The stator core 15 has a substantially rectangular outer shape. Specifically, the recording disk conveyance direction (vertical direction in FIGS. 3 and 4) has a length B perpendicular to the recording disk conveyance direction (left and right in FIGS. 3 and 4). Direction) shorter than length A. Hereinafter, the recording disk conveyance direction (vertical direction in FIGS. 3 and 4) is also referred to as the short side direction of the stator core 15, and the direction perpendicular to the recording disk conveyance direction (horizontal direction in FIGS. 3 and 4) is the long side of the stator core 15. Also called direction. For this reason, the core back 17 is comprised from the short side part 17a and the long side part 17b. Further, a caulking fixing portion 17c is secured at each corner portion of the core back 17 (see FIG. 3). However, the long side portion on the front side (the pickup device 4 side) in the recording disk conveyance direction is omitted, and the portion is an opening portion 19 a of the circular hole 19. By omitting one side in the recording disk conveyance direction in this way, the recording disk conveyance direction dimension of the stator core 15 can be shortened, and the pickup operation of the pickup device 4 is facilitated.
[0030]
The center O of the circular hole 19 is at the center position in the long side direction of the core back 17, but is shifted from the center position in the short side direction to one side in the short side direction (the lower side in FIGS. 3 and 4). Thus, since the circular hole 19 is shifted to one side in the short side direction, a sufficient width is secured in the long side portion 17b. That is, the caulking fixing portion 17c and the laser welding portion can be sufficiently secured, and the width of the long side portion 17b can be secured to such an extent that magnetic path saturation does not occur.
[0031]
The pole teeth 18 are evenly arranged in the circumferential direction on the peripheral surface 20 of the circular hole 19. Specifically, nine pole teeth 18 are formed in total, and this means that if one long side is not omitted (the circular hole is a complete circle), twelve pole teeth are formed. It means that the pole teeth 18 are arranged so as to be formed. In other words, the 12 pole teeth when the side portions are not omitted constitute three-phase poles (four poles for each phase), and one of them is omitted to form nine pole teeth.
[0032]
Note that the number of pole teeth can be six. In that case, if one long side portion is not omitted (the circular hole is a perfect circle), it means that the pole teeth are arranged so that nine pole teeth are formed.
The surface of the stator core 15 is insulated by being coated with an epoxy resin, and the winding 16 is wound around the surface of each pole tooth 18 thus insulated for each phase.
[0033]
(2) Rotor configuration
The rotor 9 mainly includes a hub 22, a rotor magnet 23 fixed to the hub 22, and a clamp magnet 24 fixed to the hub 22.
The hub 22 is formed from a ferromagnetic material (SUS430, SUS420, etc.) such as iron or stainless steel, and functions as a turntable. An annular rotor magnet 23 is fixed to the lower outer peripheral side of the hub 22 by adhesion. The rotor magnet 23 is opposed to the stator body 13 in the radial direction with a gap therebetween, and constitutes a magnetic circuit unit 41 by both. Further, the axial magnetic center position of the stator body 13 is shifted downward in the axial direction from the axial magnetic center position of the rotor magnet 23 (on the opposite side to the side where the rotor 9 exits the stator 8 in the axial direction). The magnetic attraction between the rotor magnet 23 and the rotor 9 prevents the rotor 9 from coming out of the stator 8.
[0034]
The clamp magnet 24 is an annular member and is fixed to the outer peripheral side upper end surface of the hub 22. The clamp magnet 24 holds the recording disk 5 by magnetic attraction.
Further, a recording disk transport driving device (not shown) transports the recording disk 5 from the outside of the housing 2 and mounts it on the hub 22 and the clamp magnet 24. Further, the recording disk conveyance driving device further lifts the recording disk 5 from above the hub 22 and the clamp magnet 24 against the attractive force of the clamp magnet 24 and conveys the recording disk 5 to the outside of the housing 2.
[0035]
(3) Configuration of dynamic pressure bearing
The dynamic pressure bearing 42 is a mechanism for rotatably supporting the rotor 9 with respect to the stator 8, and includes a member on the stator 8 side and a member on the rotor 9 side. Hereinafter, the dynamic pressure bearing 42 will be described while explaining the configuration of each member.
The stator 8 has a bush assembly 39 on the inner peripheral side of the bracket 12. The bush assembly 39 functions as a bearing component and includes a bush 25, a sleeve 26, a thrust plate 27, and a thrust washer 28. The bush 25 is fixed to the center hole 12a of the bracket 12 by press-fitting. The sleeve 26 is a hollow cylindrical member, and is press-fitted and fixed to the inner peripheral side of the bush 25. The sleeve 26 is a porous sintered body that is molded and sintered using metal powder, metal compound powder, or non-metal powder as a raw material, and is impregnated with lubricating oil. Examples of the raw material for the sleeve 26 include Fe—Cu, Cu—Sn, Cu—Sn—Pb, and Fe—C. On the inner peripheral surface of the sleeve 26, a herringbone-shaped dynamic pressure generating groove 26a having a substantially U-shaped cross section is formed so as to induce a radial support pressure. In this embodiment, the dynamic pressure generating groove 26a is provided at one location in the axial direction, but may be formed at two locations in the axial direction. Furthermore, a groove for generating a step-like dynamic pressure may be provided on the inner peripheral surface of the sleeve. Step-like dynamic pressure generating grooves are longitudinal grooves extending in the axial direction, and are formed, for example, at six locations in the circumferential direction.
[0036]
The thrust plate 27 is a disk-shaped member, and is fixed to the lower end of the bush 25 to close the lower side of the hollow portion of the bush 25. The thrust washer 28 is a thin disk-shaped member, and is fixed to the upper end surface of the thrust plate 27. The thrust washer 28 is made of a cushioning material having excellent wear resistance and heat resistance.
As a configuration on the rotor 9 side, a shaft 29 is provided. The upper end portion of the shaft 29 is fixed to the center hole of the hub 22. The shaft 29 is inserted on the inner peripheral side of the sleeve 26 with a slight gap. The lower end surface 29a of the shaft 29 has a curved surface whose central portion is slightly higher than the outer peripheral portion, and is seated on the thrust washer 28 when stationary.
[0037]
Lubricating oil is filled between the shaft 29 and the sleeve 26 and the thrust washer 28. With the above configuration, a radial dynamic pressure bearing portion is configured by a minute gap between the outer peripheral surface of the shaft 29 and the sleeve 26, and further, a thrust bearing portion is configured between the lower end surface 29 a of the shaft 29 and the thrust washer 28. ing.
(4) Configuration dimensions
In the present embodiment described above, the height H of the recording disk drive motor 3 is 2.6 mm or less, and preferably in the range of 2.0 to 2.6 mm. The motor height referred to here is from the lower end surface of the bracket 12 of the stator 8 (reference surface when attached to the housing 2) to the upper end surface of the recording disk mounting portion of the rotor 9 (in this embodiment, the upper end surface of the clamp magnet 24). ) In the axial direction.
[0038]
Furthermore, in this embodiment, the diameter D of the rotor 9 is 9 mm or less, and it is preferable to exist in the range of 6-9 mm.
As described above, the recording disk drive motor 3 according to the embodiment of the present invention achieves a smaller diameter and thinner thickness than the conventional one, and is used as a drive for a removable recording disk 5 having a diameter of 30 mm or less. It is the optimal size.
[0039]
(3) Operation
When the winding 16 of the stator body 13 is energized, a rotational force is applied to the rotor 9 by the magnetic circuit portion 41, and the rotor 9 is rotationally driven with respect to the stator 8. At this time, radial load support pressure and thrust load support pressure are generated in the dynamic pressure bearing 42, and the rotor 9 is rotatably supported by the stator 8.
[0040]
(4) Effects
Since the recording disk drive motor 3 is used in the recording disk drive apparatus 1 that removably holds and rotates a removable recording disk 5 having a diameter of 30 mm or less, a reduction in diameter is particularly required. Therefore, when the stator core 15 having a rectangular outer shape is used, there is a possibility that both sides of the core back 17 in the short side direction, that is, the long side part, cannot secure a sufficient width in the radial direction. Accordingly, the opening Oa of the circular hole 19 is formed by shifting the center O of the circular hole 19 from the center position in the short side direction to one side in the short side direction and by lacking the long side portion on one side in the short side direction. Thereby, the radial direction width | variety of the long side part 17b can fully be ensured, and the function of the part becomes enough. Specifically, it is possible to secure a magnetic path that does not cause saturation of the magnetic path, or to secure a sufficient area of the fixed portion. As a result, it is possible to realize a sufficient function in the recording disk drive motor 3 that achieves a reduced diameter.
[0041]
(5) Manufacturing method of stator main body
A method of manufacturing the stator body 13 described in the above embodiment will be described with reference to the flowchart of FIG.
First, in the forming step of Step S1, an electromagnetic steel plate (for example, a silicon steel plate) is divided into several steps and punched with a press to obtain a lamination 50 having a desired shape. 7 and 8, the lamination 50 includes a stator core forming portion 52 corresponding to the stator core 15, a chuck frame forming portion 53 disposed so as to surround the stator core forming portion 52, and a stator core forming portion 52. A connecting arm forming portion 54 that connects the chuck frame forming portion 53 is integrally provided. The chuck frame forming portion 53 has an annular shape and is disposed around the stator core forming portion 52. The connecting arm forming portion 54 is a plurality of elongated portions extending from the inner peripheral edge of the chuck frame forming portion 53 to the outer peripheral edge of the stator core forming portion 52. More specifically, the connecting arm forming portion 54 extends from the middle of the short side portion 17a of the stator core forming portion 52, the middle of the long side portion 17b, and the opening 19a side end portion of the short side portion 17a. . Notches 57 extending outward in the radial direction from the inner peripheral edge of the chuck frame forming portion 53 are formed on both sides in the circumferential direction of the radially outer end of each connecting arm 54. Further, a breaking detail forming portion 55 is formed between the radially outer end of each connecting arm 54 and the stator core forming portion 52. The breaking detail forming portion 55 is narrower and weaker than the connecting arm forming portion 54.
[0042]
Next, about several laminations 50 (for example, 3-5 sheets) are laminated | stacked by the lamination process of step S2. In this embodiment, as shown in FIG. 8, five laminations 50 are laminated.
Further, in step S3, the laminated body 51 is formed by performing a caulking process on the corners of the laminated body (see the fixing portion 17c in FIG. 3). As the bonding step, laser welding may be performed, or a combination of laser welding and caulking may be performed. As a result, in the laminated body 51, the stator core 15, the chuck frame, and the connection arm are respectively formed from the stator core formation portion 52, the chuck frame formation portion 53, and the connection arm formation portion 54 of each lamination 50. Further, the breaking details are formed from the breaking detail forming portion 55. In the following description of the laminated body 51, the reference numeral of the chuck frame is set to 53, the same as that of the chuck frame forming part, the reference numeral of the connecting arm is set to 54, the same as the connecting arm forming part, and the reference numerals of the breaking details are broken. 55, the same as the code of the detail forming portion.
[0043]
Furthermore, an insulating material is coated on the surface of the laminated body 51 in the insulating process of step S4. Specifically, powder (epoxy resin) coating, electrodeposition, spray coating, a combination of powder coating and spray coating, and the like are performed. In the insulating step, the laminated body 51 can be insulated using an insulator.
Further, in the winding process of step S5, the winding 16 is wound around the pole teeth 18 several tens of times with the winding machine chucking the laminated body 51 as shown in FIG. Specifically, the holding tool (chuck part) 60 of the winding machine sandwiches and holds the chuck frame 53 of the laminated body 51, and the nozzle (coil wire supply part) 61 holds the coil wire to the pole teeth of the stator core 15. Wind around 18th. The wire diameter of the coil wire is 30 to 60 μm, and the number of turns is 20 to 80 turns.
[0044]
Finally, in the cutting step of step S6, the breaking details 55 are broken by a tool (not shown) to separate the stator core 15 from the chuck frame 53. As a result, the stator body 13 in which the winding 16 is wound around the pole teeth 18 is completed. As described above, since the breaking details 55 of the laminated body 51 are broken in the separation step, a large force is not required for breaking in the separation step.
[0045]
In the manufacturing method of the stator body 13 for the inner rotor type motor described above, the chuck frame of the laminate 51 is chucked when the winding 16 is wound around each pole tooth 18 of the stator core 15 in the winding process. 53. Therefore, even if the stator core 15 itself is downsized, problems such as bending of the stator core 15 during winding are unlikely to occur.
[0046]
Moreover, in this laminated body 51, since the stator core 15 lacks one long side part, rigidity is low compared with what is not missing. However, since the chuck frame 53 of the laminate 51 is chucked when the winding is wound around each pole tooth 18 of the stator core 15 in the winding process, even if the rigidity of the stator core 15 is low. In addition, problems such as bending of the stator core 15 during winding are unlikely to occur.
[0047]
Although one embodiment of the recording disk driving motor according to the present invention has been described above, the present invention is not limited to this embodiment, and various modifications and corrections can be made without departing from the scope of the present invention. is there.
[0048]
【The invention's effect】
In the manufacturing method of the stator for the inner rotor type motor according to claim 1, it is the laminated chuck frame that is held when the winding is wound around each pole tooth of the stator core in the winding process. Therefore, even if the stator core itself is miniaturized, problems such as bending of the stator core during winding are unlikely to occur.
[0049]
In the method for manufacturing the stator for the inner rotor type motor according to claim 2, since the insulation process is between the lamination process and the winding process, the coil wire is wound around the insulated pole teeth.
In the method for manufacturing a stator for an inner rotor type motor according to claim 3, since the lamination further has a fracture detail forming portion, the fracture detail of the laminate is broken in the separation step. Therefore, a large force is not required for breaking in the separation process.
[0050]
In the method for manufacturing a stator for an inner rotor type motor according to claim 4, since the outer shape of the stator core is rectangular, both side portions of the core back in the short side direction, that is, the long side portions have a sufficient width in the radial direction. You may not be able to do it. Therefore, the opening of the circular hole is formed by shifting the center of the circular hole from the center position in the short side direction to one side in the short side direction and lacking the long side part on one side in the short side direction. Thereby, the radial direction width | variety of the long side part on the opposite side to a short side direction can fully be ensured, and the function of the part becomes enough. Specifically, a magnetic path that does not cause saturation of the magnetic path can be secured, or a sufficient area of the fixed portion can be secured. As a result, the stator core is reduced in size while ensuring sufficient functions.
[0051]
On the other hand, since the stator core lacks one long side portion, the rigidity is lower than that which is not absent. However, since it is the laminated chuck frame that is held by the winding machine when the winding is wound around each pole tooth of the stator core in the winding process, even if the rigidity of the stator core is low, the winding Problems such as bending of the stator core during wiring are less likely to occur.
[0053]
Of the present invention In lamination, since the outer shape of the stator core forming portion is rectangular, there is a possibility that the both sides of the core back in the short side direction, that is, the long side portions cannot secure a sufficient width in the radial direction. Therefore, the opening of the circular hole is formed by shifting the center of the circular hole from the center position in the short side direction to one side in the short side direction and lacking the long side part on one side in the short side direction. Thereby, the radial direction width | variety of the long side part on the opposite side to a short side direction can fully be ensured, and the function of the part becomes enough. Specifically, a magnetic path that does not cause saturation of the magnetic path can be secured, or a sufficient area of the fixed portion can be secured. As a result, the stator core is reduced in size while ensuring sufficient functions.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a removable recording disk drive apparatus as one embodiment of the present invention.
FIG. 2 is a schematic vertical cross-sectional view of a recording disk drive motor as a first embodiment of the present invention.
FIG. 3 is a plan view of a motor.
FIG. 4 is a plan view of a stator core.
5 is a VV sectional view of FIG. 4 and a longitudinal sectional view of a stator core. FIG.
FIG. 6 is a flowchart of a stator manufacturing method.
FIG. 7 is a plan view of a laminate used for manufacturing a stator.
8 is a cross-sectional view taken along the line VIII-VIII in FIG.
FIG. 9 is a plan view for explaining a winding operation by the winding machine.
[Explanation of symbols]
3. Recording disk drive motor
5 Removable recording disc
8 Stator
9 Rotor
12 Bracket
13 Stator body
15 Stator core
16 windings
17 Core back
17a Short side
17b Long side
18 pole teeth
19 Circular hole
20 circumference
22 Hub
23 Rotor magnet
50 lamination
51 Laminate
52 Stator core forming part
53 Chuck frame, Chuck frame forming part
54 connecting arm, connecting arm forming part
60 Holding tool
61 nozzles

Claims (4)

An inner rotor having a stator core having an annular core back having a circular hole in the vicinity of the center, a plurality of pole teeth extending radially inward from the circumferential surface of the circular hole, and a winding wound around the pole teeth A manufacturing method of a stator for a type motor,
A stator core forming portion corresponding to the stator core; a chuck frame forming portion disposed so as to surround the stator core forming portion; and a connecting arm forming portion connecting the stator core forming portion and the chuck frame forming portion. A preparation step of preparing a plurality of laminations integrally having
The plurality of laminations are stacked to form a stacked body so that the stator core, the chuck frame, and the connecting arm are formed from the stator core forming portion, the chuck frame forming portion, and the connecting arm forming portion, respectively. Lamination process;
A winding step of winding a winding around each pole tooth of the stator core while chucking the chuck frame of the laminate;
A separation step of breaking the boundary between the stator core and the connecting arm after winding to separate the stator core from the chuck frame;
For manufacturing a stator for an inner rotor type motor. The method for manufacturing a stator for an inner rotor type motor according to claim 1, further comprising an insulating step of applying an insulating material to a surface of the stacked body between the stacking step and the winding step. 3. The inner rotor type motor according to claim 1, wherein the lamination further includes a breaking detail forming portion that is narrower than the connecting arm forming portion at a boundary between the stator core forming portion and the connecting arm forming portion. For manufacturing a stator for an automobile. The stator core forming part has a substantially rectangular outer shape,
The center of the circular hole is at the center position in the long side direction of the core back, but is shifted from the center position in the short side direction to one side in the short side direction,
The said core back forms the opening part of the said circular hole by lacking the long side part of the said one side of a short side direction, The manufacture of the stator for inner rotor type motors in any one of Claims 1-3 Method.

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