JP2002238197A - Small spindle motor and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent production of crossover wires or disordered wire, when wires are bundled during a common process and erroneous connection of wires during a common process. SOLUTION: Two of three wires to be subjected to a common process are taken out of one and the same slot and the one remaining wire is taken out of an adjacent slot, and three-phase stator coils 8 are wound on magnetic poles of an annular core 10. When a winding end common process is carried out, in a small spindle motor provided with a stator coil component with the three- phase stator coils 8 wound on the magnetic poles of the annular core 10, the winding end wire in a phase W and the winding end wire in a phase U are taken out of an eighth slit, and the winding end wire in phase V is taken out of a ninth slit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a stator having a three-phase stator coil disposed on an annular core, a rotor having a rotor magnet disposed thereon, and a bearing for rotatably supporting the rotor on the stator. The present invention relates to a small-sized spindle motor, and more particularly, to a structure and a manufacturing method of a stator coil component formed by winding a three-phase stator coil around an annular core.

[0002]

2. Description of the Related Art A spindle motor including a stator in which a three-phase stator coil is disposed on an annular core, a rotor in which a rotor magnet is disposed, and a bearing for rotatably supporting the rotor on the stator is shown in FIG. As shown in 12,
This is a spindle motor using a fluid dynamic bearing as a bearing.
In other words, the spindle motor shown in FIG. 12 is a fluid dynamic pressure bearing having a flanged shaft member 1 and a cylindrical receiving member 4 as basic components, and is coaxially fixed to an end of the flanged shaft member 1 and rotates a hard disk or the like. A cup-shaped hub 6 for holding a body, a rotor magnet 7 attached to an inner peripheral surface of a sleeve portion of the cup-shaped hub 6, and a rotor magnet 7 attached to an outer peripheral surface of a cylindrical receiving member 4 and cooperating with the rotor magnet 7 to rotate. It comprises a stator coil 8 for generating a force and a substrate 9 on which the cylindrical receiving member 4 is erected.

FIG. 9 is an exploded view of a conventional stator coil component used in a spindle motor as shown in FIG. 12, in which a three-phase winding is applied to an annular core having nine magnetic poles and nine slots. It was done. In FIG. 9, the U-phase winding is formed by applying a predetermined number of windings to each of the first, fourth, and seventh magnetic poles. Therefore, the beginning of the U-phase winding is out of the slot (first slot) between the ninth and first magnetic poles, and the end of the U-phase winding is the seventh and eighth magnetic poles. It comes out of the slot (the eighth slot) in between.

The V-phase winding is formed by applying a predetermined number of windings to each of the second, fifth, and eighth magnetic poles. Therefore, the winding start line of the V-phase winding comes out of the slot (second slot) between the first and second magnetic poles, and the winding end line of the V-phase winding is the eighth and ninth windings. Out of the slot between the magnetic poles (the ninth slot).

Further, the W-phase winding is formed by applying a predetermined number of windings to each of the third, sixth, and ninth magnetic poles. Therefore, the winding start line of the W-phase winding comes out of the slot (third slot) between the second and third magnetic poles, and the winding end line of the W-phase winding is ninth and first. From the magnetic poles (first slot).

FIGS. 10 and 11 are plan views of a conventional stator coil component. The former shows a state before the common processing, and the latter shows a state after the winding end and the common processing.

As shown in FIGS. 9 and 10, the winding start line or the winding end line comes out of five slots of a first slot, a second slot, a third slot, an eighth slot, and a ninth slot. From the first slot, the winding start line of the U-phase winding and the winding end line of the W-phase winding come out together.

An annular core used as an example of an ultra-small spindle motor is a micro-annular ring in which a ring having a thickness of 1.5 mm, an inner diameter of 9.0 mm, and an outer diameter of 14.0 mm is reduced by at least one turn. The core. The winding wound on the micro-small annular core is formed by winding an insulated conductor of 0.1 mm, that is, a very fine insulated wire smaller than the hair, for nearly 100 turns.

Therefore, if the end-of-winding common processing is performed, a crossover occurs as shown in FIG. Although not shown, turbulent lines may also occur. When such a crossover or turbulent line occurs, the wire enters the inner diameter side of the annular core, and when the core is mounted on the outer peripheral surface of the motor frame, in the case of FIG. Could be damaged. In short, there has been a problem that insulation failure is caused by crossovers or disordered wires.

Further, in the conventional stator coil component, as shown in FIGS. 9 and 10, the winding start line of the U-phase winding and the winding end line of the W-phase come out from the same slot of the annular core together. In the case of common processing that bundles three end lines,
It was easy to mistakenly select the winding start wire of the U-phase winding. In short, it happened that, by accident, the start line and the end line were mistaken.

[0011]

The first problem to be solved
The problem is that the stator coil parts of a small spindle motor configured by applying a three-phase winding to an annular core should have a winding configuration that does not cause crossover or turbulence when bundled by common processing. is there.

A second problem to be solved is that, in a stator coil component of a small spindle motor having a three-phase winding applied to an annular core, a winding configuration that does not cause a line error when performing common processing. It is to be.

[0013]

In order to solve the above-mentioned first problem, two of the three lines to be subjected to common processing are taken out of the same slot, and the remaining one line is connected to an adjacent slot. , A three-phase stator coil was wound around the magnetic pole of the annular core.

[0014] In order to solve the second problem, the winding end common processing is performed by using the lines extending from the same slot as the W-phase winding end line and the U-phase winding end line.

[0015] In order to solve the second problem,
The wire starting from the same slot was defined as a U-phase winding start line and a W-phase winding start line, and a winding start common process was performed.

[0016]

FIG. 1 is an exploded view of a stator coil component according to a first embodiment of the present invention suitable for end-of-winding common processing.

In FIG. 1, the U-phase winding start line comes out of the first slot, and the U-phase winding end line comes out of the eighth slot. The V-phase winding start line comes out of the second slot, and the V-phase winding end line comes out of the ninth slot. In addition, the W-phase winding start line comes out of the third slot, and the W-phase winding end line comes out of the eighth slot.

FIGS. 2 and 3 are plan views of the stator coil component according to the first embodiment. The former shows a state before common processing, and the latter shows a state after end winding and common processing.

In the conventional stator coil component, the W-phase end wire exits from the first slot, but in the first embodiment, it exits from the eighth slot together with the U-phase end wire. The U-phase winding end line and the W-phase winding end line to be subjected to common processing come out of the same slot, and the V-phase winding end line comes out of the ninth slot. Therefore, the three wires at the end of the winding to be subjected to the common process are from the same slot or adjacent slots, and as shown in FIG. Was done. In addition, since the three lines at the end of the winding can be specified without fail, the problem that the common processing is performed by mistake of the lines has been solved.

Next, FIG. 4 is a development view of a stator coil component according to a second embodiment of the present invention suitable for end-of-winding common processing.

In FIG. 4, the U-phase winding start line comes out of the first slot, and the U-phase winding end line comes out of the ninth slot. The V-phase winding start line comes out of the second slot, and the V-phase winding end line comes out of the ninth slot. In addition, the W-phase winding start line comes out of the third slot, and the W-phase winding end line comes out of the first slot.

The U-phase end wire exits from the eighth slot in the conventional stator coil component, but in the second embodiment, exits from the ninth slot together with the V-phase end wire. The U-phase winding end line and the V-phase winding end line to be subjected to common processing come out of the same slot, and the W-phase winding end line comes out of the first slot. Accordingly, since the three lines at the end of the winding to be subjected to the common processing are protruded from the same slit or the adjacent slits, there is no crossover or disordered line when bundled, so that the problem of insulation failure has been solved. .

FIG. 5 is a development view of a stator coil component according to a third embodiment of the present invention, which is suitable for end-of-winding common processing.

In FIG. 5, the U-phase winding start line extends from the first slot, and the U-phase winding end line also extends from the first slot. The V-phase winding start line comes out of the second slot, and the V-phase winding end line comes out of the ninth slot. In addition, the W-phase winding start line comes out of the third slot, and the W-phase winding end line comes out of the first slot.

In the third embodiment, the U-phase end wire exits from the first slot together with the W-phase end wire in the conventional stator coil component. Therefore, since the three lines at the end of the winding that are subjected to common processing come out of the same slit or adjacent slits, there is no crossover or turbulence when bundled.
The problem of poor insulation has been eliminated.

FIG. 6 is a developed view of a stator coil component according to a fourth embodiment of the present invention, which is suitable for winding start common processing.

In FIG. 6, the U-phase winding start line comes out of the third slot, and the U-phase winding end line comes out of the eighth slot. The V-phase winding start line comes out of the second slot, and the V-phase winding end line comes out of the ninth slot. In addition, the W-phase winding start line comes out of the third slot, and the W-phase winding end line comes out of the first slot.

The U-phase winding start wire has come out of the first slot in the conventional stator coil component, but has come out of the third slot together with the W-phase winding start wire in the fourth embodiment. The U-phase winding start line and the W-phase winding start line to be subjected to common processing come out of the same third slot, and the V-phase winding start line comes out of the second slot. Therefore, the three wires at the beginning of the winding to be subjected to common processing come out of the same slot or adjacent slots, and when bundled, there is no crossover or disordered wire, so that the problem of insulation failure has been solved. . In addition, since the three lines at the beginning of the winding can be specified without fail, the problem of common processing by mistake of the lines has been solved.

FIG. 7 is a development view of a stator coil component according to a fifth embodiment of the present invention, which is suitable for winding start common processing.

In FIG. 7, the U-phase winding start line comes out of the first slot, and the U-phase winding end line comes out of the eighth slot. The V-phase winding start line comes out of the second slot, and the V-phase winding end line comes out of the ninth slot. In addition, the W-phase winding start line exits from the second slot, and the W-phase winding end line exits from the first slot.

In the conventional stator coil component, the winding start wire of the W phase has come out of the third slot, but in the fifth embodiment, it has come out of the second slot together with the winding start wire of the V phase. The V-phase winding start line and the W-phase winding start line to be subjected to common processing are coming out of the same second slot, and the U-phase winding start line is coming out of the first slot. Therefore, the three wires at the beginning of the winding to be subjected to common processing come out of the same slot or adjacent slots, and when bundled, there is no crossover or turbulence, so that the problem of insulation failure has been solved. .

FIG. 8 is a development view of a stator coil component according to a sixth embodiment of the present invention, which is suitable for winding start common processing.

In FIG. 8, the winding start line of the U-phase comes out of the first slot, and the winding end line of the U-phase comes out of the eighth slot. The V-phase winding start line comes out of the second slot, and the V-phase winding end line comes out of the ninth slot. Further, the winding start line of the W-phase extends from the first slot, and the winding end line of the W-phase also extends from the first slot.

In the conventional stator coil component, the W-phase winding start wire has come out of the third slot, but in the sixth embodiment, it has come out of the first slot together with the U-phase winding start wire. The U-phase winding start line and the W-phase winding start line to be subjected to common processing come out of the same first slot, and the V-phase winding start line comes out of the second slot. Therefore, the three wires at the beginning of the winding to be subjected to common processing come out of the same slot or adjacent slots, and when bundled, there is no crossover or disordered wire, so that the problem of insulation failure has been solved. .

FIG. 13 shows a comparison between the six embodiments described in detail above and the conventional example.

[0036]

According to the present invention, since the wires bundled in the common processing do not enter the inner diameter side of the core, the insulation failure caused by the crossover wires and the turbulent wires is drastically reduced. Also, U
According to the present invention in which the winding start of the phase and the winding end of the W phase are made to exit from the separate slits, in addition to the drastic reduction of the insulation failure, it is also possible to prevent the occurrence of a wire mistake during the common processing. Was. Therefore, the occurrence rate of defective products in the assembly process of the stator coil components is reduced, and the productivity of the small spindle motor is increased.

[Brief description of the drawings]

FIG. 1 is a first view of a stator coil component used in the present invention.
It is a development view of an embodiment.

FIG. 2 shows a first example of a stator coil component used in the present invention.
It is a top view of an embodiment. However, it shows the state before the common processing.

FIG. 3 shows a first example of a stator coil component used in the present invention.
It is a top view of an embodiment. However, it shows the state after the common processing.

FIG. 4 shows a second example of the stator coil component used in the present invention.
It is a development view of an embodiment.

FIG. 5 shows a third example of the stator coil component used in the present invention.
It is a development view of an embodiment.

FIG. 6 shows a fourth part of the stator coil component used in the present invention.
It is a development view of an embodiment.

FIG. 7 shows a fifth stator coil component used in the present invention.
It is a development view of an embodiment.

FIG. 8 shows a sixth stator coil component used in the present invention.
It is a development view of an embodiment.

FIG. 9 is a development view of a stator coil component used in a conventional spindle motor.

FIG. 10 is a plan view of a stator coil component used in a conventional spindle motor. However, it shows the state before the common processing.

FIG. 11 is a development view of a stator coil component used in a conventional spindle motor. However, it shows the state after the common processing.

FIG. 12 is a cross-sectional view of an example of a small spindle motor including a dynamic pressure bearing.

FIG. 13 is a table showing slots from which the winding start line and the winding end line extend in the first to sixth embodiments and the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft member with a flange 2 Column member 3 Ring member for dynamic pressure 4 Cylindrical receiving member 5 Annular holding member 6 Cup-shaped hub 7 Rotor magnet 8 Stator coil 9 Motor substrate 10 Annular core

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H02K 21/22 H02K 21/22 MF term (reference) 5H603 AA09 BB01 BB07 BB13 CA01 CA05 CB02 CB04 CB18 CC05 CC11 CC17 CD23 CE01 5H604 AA08 BB01 BB15 CC01 CC05 CC15 CC16 QB14 5H615 AA01 BB01 BB14 PP01 PP08 PP13 PP15 QQ02 QQ19 5H621 BB10 GA04 GB14 HH01

Claims (6)

[Claims] 1. A small spindle motor comprising: a stator having a three-phase stator coil disposed on an annular core; a rotor having a rotor magnet disposed therein; and a bearing rotatably supporting the rotor on the stator. A three-phase stator coil is wound around the magnetic pole of the annular core such that two of the three wires to be subjected to common processing are taken out of the same slot and the other one is taken out of an adjacent slot. A small spindle motor characterized by: 2. The winding end line of the W-phase and the winding end line of the U-phase when the common processing at the end of the line is performed. The described small spindle motor. 3. The winding start line of the U-phase and the winding start line of the W-phase when the common processing at the start of winding of the line is performed. The described small spindle motor. 4. A small spindle motor comprising a stator having a three-phase stator coil disposed on an annular core, a rotor having a rotor magnet disposed thereon, and a bearing rotatably supporting the rotor on the stator. In the manufacturing method, a step of taking out two of the three lines to be subjected to common processing from the same slot, a step of taking out the remaining one line from an adjacent slot, And a step of winding a stator coil. 5. The method according to claim 4, wherein, when performing the common processing at the end of the line, the lines output from the same slot are a W-phase end-of-line line and a U-phase end-of-line line. A manufacturing method of the small spindle motor according to the above. 6. The winding start line of the U-phase and the winding start line of the W-phase when the common processing at the start of winding of the line is performed. A manufacturing method of the small spindle motor according to the above.