JP2003116237A - Small spindle motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent cross-over lines or irregular lines from being produced when wires are bundled in common processing and inter-lines errors from being produced during common processing. SOLUTION: A phase-U winding is wound around a first magnetic pole, a fourth magnetic pole, and a seventh magnetic pole by the specified number of turns, respectively. After the phase-U winding is wound around the seventh magnetic pole, the line at the winding end thereof goes out of a ninth slot. A phase-V winding is wound around a second magnetic pole, a fifth magnetic pole, and an eighth magnetic pole by the specified number of turns, respectively. After the phase-V winding is wound around the eighth magnetic pole, the line at the winding end thereof goes out of the ninth slot. A phase-W winding is wound around a third magnetic pole, a sixth magnetic pole, and a ninth magnetic pole by the specified number of turns, respectively. After the phase-W winding is wound around the ninth magnetic pole, the line at the winding end thereof is turned back, lapped around the seventh magnetic pole by one turn, and thereafter goes out of the ninth slot. Thus, the three wires subjected to winding end common processing are taken out of the same slot, which is the ninth slot.

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 arranged on an annular core, a rotor having a rotor magnet, 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 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 having a three-phase stator coil arranged on an annular core, a rotor having a rotor magnet, and a bearing rotatably supporting the rotor on the stator is shown in FIG. As shown in 8, the spindle motor uses a fluid dynamic bearing as the bearing. That is, the spindle motor shown in FIG. 8 is a fluid dynamic bearing having a flanged shaft member 1 and a cylindrical receiving member 4 as basic constituent members, and is fixed coaxially to the end of the flanged shaft member 1 to rotate a hard disk or the like. A cup-shaped hub 6 for holding the body, a rotor magnet 7 attached to the inner peripheral surface of the sleeve portion of the cup-shaped hub 6, and an outer peripheral surface of the cylindrical receiving member 4 to rotate in cooperation with the rotor magnet 7. It is composed of a stator coil 8 for generating a force and a substrate 9 on which the cylindrical receiving member 4 is erected.

FIG. 5 is an exploded view of a conventional stator coil component used in a spindle motor as shown in FIG. 9, 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 winding the first magnetic pole, the fourth magnetic pole, and the seventh magnetic pole a predetermined number of times. Therefore, the winding start of the U-phase winding goes out from the slot (first slot) between the ninth and first magnetic poles, and the winding end of the U-phase winding ends at the seventh and eighth magnetic poles. It comes out from the slot (8th slot) in between.

The V-phase winding is formed by winding the second magnetic pole, the fifth magnetic pole, and the eighth magnetic pole a predetermined number of times. Therefore, the winding start line of the V-phase winding comes out from the slot (second slot) between the first and second magnetic poles, and the winding-end line of the V-phase winding is the 8th and 9th. It comes out from the slot (9th slot) between the magnetic poles.

Further, the W-phase winding is formed by winding the third magnetic pole, the sixth magnetic pole, and the ninth magnetic pole a predetermined number of times. 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 the ninth and first winding lines. From the slot (first slot) between the magnetic poles.

6 and 7 are plan views of a conventional stator coil component, the former showing a state before common processing and the latter showing a state after winding end common processing.

As shown in FIG. 6 and FIG. 7, the winding start line or winding end line is composed of the first slot, the second slot, the third slot,
It comes out from five slots, the eighth slot and the ninth slot. Then, 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.

By the way, the annular core used in an example of the microminiature spindle motor is a microminiature annular ring in which a ring having a thickness of 1.4 mm, an inner diameter of 8.8 mm and an outer diameter of 13.4 mm is made smaller than one turn. It is the core. The winding provided on the microminiature annular core is formed by winding an insulated conductive wire of 0.09 mm, that is, an insulated conductive wire of a fine wire finer than hair, for about 100 turns.

Therefore, if the common processing at the end of winding is performed, a crossover will be generated as shown in FIG. Although not shown, a disturbance line may also occur. When such a crossover wire or a turbulent wire occurs, the wire enters the inner diameter side of the annular core, and when the core is attached to the motor frame, the outer peripheral surface of the receiving member 4 of the fluid dynamic bearing in the case of FIG. May have been damaged. In short, there is a problem in that insulation failure occurs due to the crossover wires and the disturbed wires.

Further, in the conventional stator coil component, as shown in FIG. 6 and FIG.
Since the winding start line of the phase winding and the winding end line of the W phase come out together, mistakenly select the winding start line of the U-phase winding when performing common processing that bundles three winding end lines. Was easy to get up. In short, it happened that the winding start line and winding end line were mistaken.

[0011]

First problem to be solved
The problem is to use a winding configuration that does not cause crossovers or disturbance lines in a stator coil component of a small spindle motor that is configured by applying a three-phase winding to an annular core when bundled by common processing. is there.

[0012] A second problem to be solved is a stator coil component of a small-sized spindle motor which is formed by applying a three-phase winding to an annular core, and has a winding structure that does not cause a line error during common processing. Is to

[0013]

A small-sized spindle motor according to claim 1, which solves the first and second problems, comprises a stator having a three-phase stator coil of U, V, and W arranged on an annular core. , A rotor provided with a rotor magnet,
When the rotor is composed of a bearing that rotatably supports the stator, and the winding end common processing is performed, the U-phase winding end line and the W-phase winding end line are output from the slot for the V-phase winding end line. I did it.

According to another aspect of the present invention, there is provided a compact spindle motor according to claim 2, wherein U, V and W are provided on the annular core.
Of the U-phase when common processing is performed at the start of winding, the stator includes a three-phase stator coil, a rotor having a rotor magnet, and a bearing that rotatably supports the rotor on the stator. The winding start line and the W-phase winding start line are made to come out from the slots for the V-phase winding start line.

[0015]

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

In FIG. 1, the U-phase winding start line extends from the first slot, and the U-phase winding end line extends from the ninth slot. That is, the U-phase winding is wound around the first magnetic pole, the fourth magnetic pole, and the seventh magnetic pole a predetermined number of times, but the winding end line after being wound around the seventh magnetic pole comes out from the ninth slot. .

The V-phase winding start line extends from the second slot, and the V-phase winding end line extends from the ninth slot. That is, the V-phase winding is wound around the second magnetic pole, the fifth magnetic pole, and the eighth magnetic pole a predetermined number of times, but the winding end line after being wound around the eighth magnetic pole comes out from the ninth slot. .

Further, the winding start line of the W phase is output from the third slot, and the winding end line of the W phase is output from the ninth slot. That is, the W-phase winding is wound around the third magnetic pole, the sixth magnetic pole, and the ninth magnetic pole a predetermined number of times, but the winding end line after being wound around the ninth magnetic pole reverses to return to the seventh magnetic pole. It has gone out of the 9th slot after one lap.

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 common finishing after winding.

In the conventional stator coil component, the U-phase winding end wire extends from the eighth slot, but in the first embodiment, it exits from the ninth slot together with the V-phase winding end wire. In addition, the W-phase winding end line is output from the first slot in the conventional stator coil component, but is output from the ninth slot together with the V-phase winding end line in the first embodiment. The U-phase winding end line and the W-phase winding end line subjected to common processing are output from the ninth slot together with the V-phase winding end line. Therefore, 3 of the end of winding that is processed as common
Since the lines of the book come out of the same slot and no crossovers or disorder lines are generated as shown in FIG. 3, the problem of insulation failure is solved. In addition, since the three wires at the end of the winding can be identified without fail, the problem of mistaking the wires and performing common processing has been solved.

Next, FIG. 4 is a development view of the stator coil component of the second embodiment of the present invention, which is suitable for the winding start common processing.

In FIG. 4, the winding start line of the U phase extends from the second slot, and the winding end line of the U phase extends from the eighth slot. That is, the U-phase winding is wound around the first magnetic pole, the fourth magnetic pole, and the seventh magnetic pole a predetermined number of times, respectively, but before being wound around the first magnetic pole, the U-phase winding is adjacent to the ninth magnetic pole. Has made one lap.

The V-phase winding start line extends from the second slot, and the V-phase winding end line extends from the ninth slot. That is, the V-phase winding is wound around the second magnetic pole, the fifth magnetic pole, and the eighth magnetic pole a predetermined number of times, but the winding end line after being wound around the eighth magnetic pole comes out from the ninth slot. .

Further, the winding start line of the W phase is output from the second slot, and the winding end line of the W phase is output from the first slot. That is, the W-phase winding is wound around the third magnetic pole, the sixth magnetic pole, and the ninth magnetic pole a predetermined number of times, but passes through the third slot before being wound around the third magnetic pole.

The U-phase winding start line has come out from the first slot in the conventional stator coil component, but has come out from the second slot together with the V-phase winding start line in the second embodiment. In addition, the winding start line of the W phase has come out from the third slot in the conventional stator coil component, but has come out from the second slot together with the winding start line of the V phase in the second embodiment. The U-phase winding start line and the W-phase winding start line that are subjected to the common processing are output from the second slot together with the V-phase winding start line. Therefore, 3 of the end of winding that is processed as common
Since the wires of the book come out of the same slot, there are no crossovers or turbulences, so the problem of insulation failure is solved. Also,
Since the three wires at the beginning of the winding can be identified with certainty, the problem of mistaking the wires and performing common processing has been solved.

A comparison between the two embodiments described in detail above and the conventional example is shown in FIG.

[0027]

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 due to the crossover wires and the disturbed 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 output from separate slots, in addition to the drastic reduction of the insulation failure, it is possible to prevent a line error from occurring during the common processing. It was Therefore, the occurrence rate of defective products in the assembly process of the stator coil parts is reduced, and the productivity of the small spindle motor is increased.

[Brief description of drawings]

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

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

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

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

FIG. 5 is a development view of a stator coil component used in a conventional spindle motor.

FIG. 6 is a plan view of a stator coil component used in a conventional spindle motor. However, the state before common processing is shown.

FIG. 7 is a development view of a stator coil component used in a conventional spindle motor. However, it shows the state that common processing has been completed.

FIG. 8 is a cross-sectional view of an example of a small spindle motor including a dynamic pressure bearing.

FIG. 9 is a table showing which slot the winding start line and the winding end line are from in the first embodiment, the second embodiment, and the conventional example.

[Explanation of symbols]

1 Shaft member with flange 2 cylindrical members 3 Ring member for dynamic pressure 4 Cylindrical receiving member 5 Annular pressing member 6 cup-shaped hub 7 rotor magnet 8 Stator coil 9 Motor board 10 annular core

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Ryoji Yoneyama             1-8 Nakase, Nakase, Mihama-ku, Chiba City, Chiba Prefecture             Ico Instruments Co., Ltd. F-term (reference) 5H603 AA03 BB01 BB07 BB10 BB13                       CA01 CA05 CB04 CB17 CC11                       CC17                 5H604 AA05 BB01 BB10 BB17 CC01                       CC05 CC16 QB13                 5H621 BB07 BB10 GA04 GB14 HH01                       JK19

Claims (2)

[Claims] 1. A stator having a three-phase stator coil of U, V, and W arranged on an annular core, a rotor having a rotor magnet, and a bearing for rotatably supporting the rotor on the stator. For small spindle motors,
When the common processing at the end of winding is performed, the winding end line of the U phase and W
A small spindle motor characterized in that the winding end line of the phase is made to come out from the slot for the winding end line of the V phase. 2. A stator having a three-phase stator coil of U, V, and W arranged on an annular core, a rotor having a rotor magnet, and a bearing for rotatably supporting the rotor on the stator. For small spindle motors,
A small spindle motor characterized in that a U-phase winding start line and a W-phase winding start line are made to come out from slots for the V-phase winding start line when the winding start common processing is performed.