JP2001352705A - Spindle motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spindle motor capable of stably holding a terminal pin by a small number of part items to have good mounting accuracy. SOLUTION: A cylindrical stator layered product 1 constituting a stator core 9a is partially protruded to an internal peripheral side, and a fixed part 1a is formed. The fixed part 1a comprises a hold part 4 constituted by filling a hole 13 formed in a stator plate with resin and a support hole 14 inserting a terminal pin 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a stator core of a spindle motor used for information equipment and the like.

[0002]

2. Description of the Related Art Conventionally, terminal pins have been used for connection between a stator core and a drive circuit.
As described in Japanese Patent No. 5278, a method of integrally forming a terminal pin and a stator core by resin molding and making an end portion of the terminal pin abut on a land portion of a printed circuit board constituting a drive circuit to perform electrical connection. Has been taken.

FIG. 4 shows a conventional stator core, and FIG. 5 shows a spindle motor using the same. FIG. 4 (a),
As shown in (b), a coil 2 is wound around an iron core radially extending in the outer peripheral direction in a cylindrical stator laminate 1 in which a plurality of thin stator plates are laminated.

A resin portion 4 and terminal pins 6 embedded and fixed in the resin portion 4 are provided at an end of the stator laminate 1 by injection molding. A cylindrical core holder 3 for holding the resin portion 4 is fixed. The core holder 3 is formed from a metal having heat dissipation.

[0005] The winding end 5 of the coil 2 and the terminal pin 6 are connected by soldering or laser welding to form a stator core 9b. As shown in FIG. 5, the stator core 9b configured as described above has a tip portion of the terminal pin 6 on a land portion (not shown) of the printed circuit board 7 as a drive circuit attached to the base 8. The spindle motor is fixed so as to be in contact with the solder 15 to form a spindle motor.

[0006]

However, in the above-mentioned conventional spindle motor, the resin portion 4 for integrating the stator core 9b and the terminal pin 6 and the core holder 3 for holding the resin portion are required, and the number of parts is large. The cost is high.

Further, since the terminal pin 6 is held only by the resin portion 4, the holding force is weak, and an error in coaxiality occurs when the core holder 3 is mounted on the stator core 9b, resulting in poor mounting accuracy. There is.

Further, when the coil 2 is wound, since the core holder 3 and the like are provided in the vicinity of where the coil is wound, the relay portion of the coil is liable to interfere with the coil 2, thereby increasing the defect rate and automating the winding. There is a problem that it is difficult.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a spindle motor which solves the above-mentioned problems, has a small number of parts, has good mounting accuracy, and can automate winding.

[0010]

A spindle motor according to the present invention is characterized in that a fixed portion of a terminal pin is provided on a part of a stator laminated body.

According to the present invention, the terminal pin can be stably held with a small number of parts without using a member such as a core holder or the like, and a spindle motor with high mounting accuracy can be realized.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A spindle motor according to a first aspect of the present invention is wound around a cylindrical stator laminate in which a plurality of stator plates are laminated, and an iron core radially extending in an outer peripheral direction of the stator laminate. A spindle motor having a stator core including a coil and a terminal pin for electrically connecting the coil to a drive circuit, wherein a fixed portion of the terminal pin is formed in a part of the stator laminate. I do.

According to this configuration, the terminal pin can be stably held without using a core holder or the like, and a spindle motor with high mounting accuracy can be realized. According to a second aspect of the present invention, in the spindle motor, a hub is rotatably supported on a shaft having a base end supported by a base, a magnet is provided inside the hub, and the base is opposed to the magnet. A coil is wound around a stator laminated body arranged coaxially with the shaft on a base, and a stator core having an end portion of the winding connected to a terminal pin is provided, and a drive provided outside the stator core and the base is provided. A spindle motor electrically connected to a circuit via a terminal pin, wherein at least a part of the stator laminate is provided with a fixed part integrally formed with the stator laminate, and a base end of the terminal pin is provided. The apparatus is characterized in that it is fixed to the fixing part, and a tip is connected to the drive circuit through the base.

According to this configuration, since the fixed portion is formed in a part of the stator laminated body, the number of parts can be reduced, and a spindle motor with good mounting accuracy can be realized. According to a third aspect of the present invention, in the spindle motor according to the second aspect, the fixing portion is provided on an inner peripheral side of the cylindrical stator laminate.

According to this configuration, the workability is improved because the relay portion of the coil does not interfere with winding, the defective rate is reduced, and the winding can be automated. According to a fourth aspect of the present invention, in the spindle motor according to the third aspect, the fixing is performed by protruding a part of a plurality of stator plates constituting the stator laminated body toward an inner peripheral side at one end of the stator laminated body. A part is formed.

According to this configuration, the fixing portion for attaching the terminal pin can be easily formed. According to a fifth aspect of the present invention, in the spindle motor according to the fourth aspect, the fixing portion includes a holding portion filled with resin in a hole formed in a part of a stator plate protruding inward, and And a support hole formed in the portion for inserting the terminal pin.

According to this configuration, the terminal pins and the stator core can be easily insulated. According to a sixth aspect of the present invention, in the spindle motor according to the fifth aspect, the diameter of the support hole is smaller than the diameter of the terminal pin, and the terminal pin is press-fitted into the support hole and supported by the fixing portion. It is characterized by the following.

According to this configuration, the mounting strength of the terminal pin can be improved. According to a seventh aspect of the present invention, in the spindle motor according to the second aspect, the base is provided with a support portion that penetrates and supports a terminal pin supported by the fixed portion.

According to this configuration, the accuracy of attaching the stator core to the base can be improved. Hereinafter, a spindle motor according to the present invention will be described with reference to FIGS.
This will be described with reference to FIG.

The components having the same configuration as in FIGS. 4 and 5 showing the conventional example will be described with the same reference numerals. (Embodiment) In this (embodiment), FIG.
As shown in (b), the stator core 9a is different from the above-described conventional example in that a fixing portion 1a for fixing the terminal pin 6 is provided in a part of the stator laminate 1 constituting the stator core 9a.

More specifically, a coil 2 is wound around an iron core extending radially in the outer peripheral direction on a cylindrical stator laminate 1 in which a plurality of thin stator plates are laminated. At one end of the stator laminate 1, a fixing portion 1 a is formed in which a plurality of stator plates protrudes from a part of the inner peripheral side and fixes the terminal pin 6.

A fan-shaped hole 13 is formed in the fixing portion 1a. A mold is set in the hole 13 and a resin is injected to perform injection molding. The resin extends not only in the hole 13 of the fixing portion 1a but also in the axial direction in which the terminal pin 6 is inserted.
The holding part 4 is formed. At the bottom of the holding part 4, the holding part 4
The number of the support holes 14 that are not through holes that do not penetrate through the terminal pins 6 is formed by the number of the terminal pins 6, and the base ends of the terminal pins 6 are inserted.

The terminal pins 6 can be fixed by the support holes 14 of the holding portion 4, and the resin for forming the holding portion 4 can be insulated from the stator core 9 a. At this time, if the diameter of the support hole 14 is smaller than the diameter of the terminal pin 6, the inserted terminal pin 6 is in a state of being press-fitted and fixed, and the mounting strength can be further improved.

Then, the winding end 5 of the coil 2 and the tip of the terminal pin 6 are connected by soldering or laser welding to form a stator core 9a. In the stator core 9a configured as described above, the workability is improved and the defect rate is reduced because the coil relay portion does not interfere with the winding at the time of winding. It is also possible to automate the winding.

FIG. 2 shows a spindle motor using the stator core 9a configured as described above. As shown in FIGS. 3A and 3B, the base 8 used for the spindle motor has a hole 8c for supporting the shaft 1 and a recess 8a as a support for receiving the fixed portion 1a of the stator core 9a. The recess 8a is formed with a hole 8b through which the terminal pin 6 supported by the holding portion 4 passes.

The base end of the shaft 10 is inserted and supported in the hole 8c of the base 8, and the hub 11 is rotatably supported by the shaft 10. A magnet 12 is provided inside the hub 11, and the stator core 9 a is arranged so as to face the magnet 12 and to fit the fixing portion 1 a of the stator core 9 a in the recess 8 a of the base 8, and the stator core 9 a is bonded and fixed to the base 8. You. Reference numeral 15 denotes solder for fixing the terminal pins 6.

The tip of the terminal pin 6, which is insulated and supported by the stator core 9a, protrudes outside the base 8 through a hole 8b formed in the recess 8a, and is a printed circuit board 7 which is a drive circuit mounted outside the motor. Is electrically connected to The hole 8b is sealed with the adhesive 16 or the like after the stator core 9a is attached.

As described above, the concave portion 8 as a supporting portion is provided on the base 8.
By providing a and receiving the spindle motor 9a, the mounting accuracy of the stator core 9a to the base 8 can be improved.

Further, the obtained spindle motor does not require members such as the core holder 3, so that the stator core 9a can be mounted with a small number of parts, and the cost can be reduced. In the above description, the fixed portion 1a is provided on a part of the inner peripheral side of the stator laminate 1, but may be provided over the entire inner peripheral side of the stator laminated body 1, or a plurality of fixed portions 1a may be provided. Is also good.

[0030]

As described above, according to the spindle motor of the present invention, the fixed portion of the terminal pin for connecting the coil of the stator core and the drive circuit is formed in a part of the stator laminated body, so that the core holder or the like is used. The terminal pin can be stably held with a small number of components without any trouble, and a spindle motor with good mounting accuracy can be realized.

When the fixed portion is formed on the inner peripheral portion of the stator laminated body, the relay portion of the coil does not interfere at the time of winding, the workability is improved, the defective rate is reduced, and the winding can be automated. .

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a stator core and a bottom view in an AB direction according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a spindle motor using the stator core of FIG. 1;

3 is a plan view and a longitudinal sectional view of a base in the spindle motor of FIG. 2;

FIG. 4 is a longitudinal sectional view of a conventional stator core and a bottom view from the AB direction.

FIG. 5 is a sectional view of a spindle motor using the stator core of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator laminated body 1a Fixed part 4 Holding part 6 Terminal pin 7 Printed circuit board 8 Base 8a Depression 8b, 8c hole 9a Stator core 14 Support hole

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masato Masuda 8-1, Koshinmachi, Takamatsu City, Kagawa Prefecture F-term in Matsushita Hisashi Denshi Kogyo Co., Ltd. 5H019 AA10 CC04 DD02 EE09 EE14 5H603 AA03 BB01 BB09 BB10 BB13 BB19 CA01 CA05 CA10 CB12 CB16 CB26 CC11 CD01 CD04 CD14 CD21 CE01 EE01 EE09 EE11 5H604 AA05 AA08 BB01 BB10 BB15 BB16 BB17 CC01 CC05 CC16 PB03 PC03 QB03 QB04 QB14 5H621 BB07 GA01 GA04 GB08 GB14 JK08 J14

Claims (7)

[Claims] 1. A cylindrical stator laminate comprising a plurality of stator plates laminated, a coil wound on an iron core extending radially in an outer peripheral direction of the stator laminate, and the coil electrically connected to a drive circuit. A spindle motor having a stator core comprising terminal pins for performing the operation, wherein a fixed portion of the terminal pin is formed in a part of the stator laminate. 2. A hub whose base end is rotatably supported by a shaft supported by a base, a magnet is provided inside the hub, and the base is coaxial with the shaft facing the magnet. A coil is wound around a stator laminated body arranged at a position, a stator core having an end of the winding connected to a terminal pin is provided, and the stator core and a driving circuit provided outside the base are connected via a terminal pin. A spindle motor which is electrically connected to the stator laminate, wherein a fixed portion integrally formed with the stator laminate is provided on at least a part of the stator laminate, and a base end of the terminal pin is fixed to the fixed portion; A spindle motor having a tip connected to the drive circuit through the base; 3. The spindle motor according to claim 2, wherein the fixed portion is provided on an inner peripheral side of the cylindrical stator laminate. 4. The spindle motor according to claim 3, wherein said fixed portion is formed at one end of said stator laminate by protruding a part of a plurality of stator plates constituting said stator laminate toward an inner peripheral side. 5. A holding portion having a resin filled in a hole formed in a part of a stator plate protruding inwardly, said fixing portion comprising:
5. The spindle motor according to claim 4, further comprising a support hole formed in said holding portion for inserting said terminal pin. 6. The spindle motor according to claim 5, wherein a diameter of said support hole is smaller than a diameter of said terminal pin, and said terminal pin is press-fitted into said support hole and supported by said fixed portion. 7. The spindle motor according to claim 2, wherein the base is provided with a support portion for penetrating and supporting a terminal pin supported by the fixed portion.