JP3127916B2 - Brushless motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small brushless motor, and more particularly, to a connection structure of a winding terminal thereof.

[0002]

2. Description of the Related Art Information-related equipment is becoming smaller and more dense. Also, a brushless motor (hereinafter referred to as a motor) used for the same is required to be downsized. At the same time, cost reduction is also required. To reduce the cost without lowering the quality, it is better to improve the productivity.

A major factor that hinders improvement in productivity in a brushless motor is connection of winding terminals.

[0004] Many proposals have been made to improve the productivity of the connection of the winding terminals.

[0005] In a normal small motor, a wire processing structure is conventionally arranged at the annular base of the core. If the relay terminal is provided, a structure suitable for automation can be easily configured, for example, the terminal can be wound simultaneously with the coil winding operation.

[0006] Furthermore, as a device suitable for thinning and capable of being directly soldered to an adjacent printed circuit board, Japanese Patent Publication No.
No. 2209 is known. This involves placing a core holder further inside the annular base on the inner periphery of the salient pole of the core, providing a hook-shaped projection on the end face of the core holder to hold the crossover of the coil, and connecting this crossover to the printed circuit board. It connects to the land. It is necessary to make a hole on the printed circuit board so that hook-shaped protrusions can be inserted.
It can be directly connected to a printed circuit board without using a relay terminal, and automation is easy.

[0007]

However, this structure is suitable for a motor having a large outer diameter which can secure a space for disposing the core holder inside the annular base of the core, and is suitable for a relatively small motor. Is difficult to apply.

[0008] Further, when the line processing structure is required to be small enough not to be arranged at the annular base portion of the core, these conventional structures cannot cope with such a case. I have to rely on the method. Therefore, productivity was remarkably low, and quality and reliability were not sufficient. Therefore, there has been a demand for a structure that can cope with such a situation, can easily perform line processing while keeping the motor shape small and thin, and has high motor quality, reliability, and productivity.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve these problems, and a wire holder made of an insulating material is provided on an end face near an outer peripheral portion of a core, so that a coil holder is provided. The terminal is held by the wire holder via the end face side, the printed circuit board is disposed adjacent to the wire holder, and has a land on the wire holder side, and the terminal of the coil is landed at a portion passing through the end face side of the wire holder. It is configured to be connected to.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION
It is configured with the following requirements.

A) It has a core, a coil, a wire holder, and a printed circuit board.

B) The core has a plurality of salient poles projecting in the outer peripheral direction.

C) The coil is wound around salient poles and has a terminal.

D) The wire holder is a member made of an insulating material, and is disposed on the end face near the outer peripheral portion of the core.

E) The end of the coil is held by the wire holder via its end face.

F) The printed circuit board is disposed adjacent to the wire holder and has a land on the side of the wire holder.

G) The terminal of the coil is connected to the land at a portion passing through the end face side of the wire holder.

H) The wire holder further keeps a space between the core and the printed board on the outer peripheral side of the core.

By arranging the wire holder on the end face near the outer peripheral portion of the core as described above, the wire processing can be easily performed in a very small motor in which a line processing structure cannot be formed on the inner annular portion of the core. Can do it. Therefore, automatic line processing can be performed even with a very small motor.

Here, the wire holder may be divided into a plurality of members. The shape may project radially from the center. However, if the wire holder is formed integrally without being divided, it becomes easy to handle especially when assembling a small motor. In addition, handling and assembling properties are improved, and productivity can be improved.

The invention according to claim 2 is configured to satisfy the following requirements.

A) It has a core, a coil, a wire holder, and a printed circuit board.

B) The core has a plurality of salient poles projecting in the outer peripheral direction.

C) The coil is wound around salient poles and has a terminal.

D) The wire holder is a substantially ring-shaped member made of an insulating material, has an outer diameter larger than the coiled portion of the core, and is disposed on the end face side of the core.

E) The wire holder has an engaging portion projecting between the salient poles of the core from the wire holder, and is engaged with the end face side of the core.

F) The end of the coil is held by the wire holder via the end face side.

G) The printed circuit board is disposed adjacent to the wire holder and has a land on the side of the wire holder.

H) The terminal of the coil is connected to the land at a portion passing through the end face side of the wire holder.

I) The wire holder further keeps a space between the core and the printed circuit board on the outer peripheral side of the core.

As described above, the wire holder is ring-shaped and has a larger outer diameter than the portion where the coil winding of the core is applied. That is, the size is set to be large enough not to interfere with the coil within a range that can be accommodated in the motor. Since it has a sufficient size, wire processing can be easily performed, and it can be arranged on the same plane as a portion occupied by the coil, so that a thin motor can be obtained.

A third aspect of the present invention is the brushless motor according to any one of the first and second aspects, wherein the terminal and the land are connected at a portion sandwiched between the wire holder and the printed board. It is suitable for a motor having no empty space for arranging lands, particularly a small motor having no space for a terminal support structure. Further, the position of the terminal with respect to the printed circuit board can be reliably set without variation.

According to a fourth aspect of the present invention, there is provided the brushless motor according to any one of the first and second aspects, wherein an end holding portion for holding the end of the coil end is provided on the inner peripheral side of the wire holder. The end holding portion can be located at a position suitable for fixing the coil terminal via the outer periphery and the end face of the wire holder, so that workability is good. Therefore, the productivity of the motor is improved.

According to a fifth aspect of the present invention, a terminal holding portion for holding a terminal end of a coil terminal is provided on the inner peripheral side of the wire holder, and the terminal of the coil is connected to the terminal holder via the outer peripheral side and the end surface side of the wire holder. The brushless motor according to claim 1, wherein the brushless motor is held. Since the end near the end is connected and fixed in a state where the end of the terminal is directed in the inner circumferential direction, it is possible to prevent the end from being held in the inner circumferential direction, and to prevent the end from moving toward the rotor and causing biting lock.

According to a sixth aspect of the present invention, a terminal holding portion for holding the terminal end of the coil terminal is provided on the inner peripheral side of the wire holder, and the terminal holding portion arranges a land of the printed circuit board between the terminal holder and the outermost peripheral portion of the wire holder. 3. The coil according to claim 1, wherein the terminal of the coil has a space in which the terminal and the land are connected via the outer peripheral side and the end face side of the wire holder, and is held in the terminal holding section. It is a brushless motor. The land is located between the salient poles of the core, and the terminal is guided radially inward from the outer periphery via the land. The terminal connection can be observed through the core, and the connection quality can be confirmed.

[0036]

Embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1 FIG. 1 is a side sectional view of a motor according to a first embodiment of the present invention. FIG. 2A is a plan view of a stator of the motor, and FIG. 2B is a side sectional view thereof. FIG. 3A is a plan view of a wire holder incorporated in the stator, FIG. 3B is a side sectional view thereof, and FIG.
(C) is a bottom view thereof.

This motor is a vibration generating motor mainly used for mobile phones. In FIG. 1, the motor includes a stator 1, a printed circuit board 2, a bearing device 3, and a rotor 4.
And a cover 5.

The stator 1 is formed by covering the surface of a core 6 with an insulating film and then winding a coil 7. Further, a wire holder 15 is provided between the stator 1 and the printed circuit board 2. And the terminal 7a of the coil 7
Is held from the outer peripheral side to the inner peripheral side of the wire holder 15 via the end face side, and can be connected to the printed circuit board 2.

As the printed board 2, a double-sided through-hole board is used. Land 2 on the bottom of printed circuit board 2
a and 2e. There are also a plurality of lands 2b on the stator mounting surface side. The terminal 7a of the coil 7 is soldered to the land 2b. This land 2b is a land 2a on the bottom side.
Are electrically connected to each other through a through hole 2d.

The bearing device 3 and the stator 1 are coaxially fixed to the stator mounting surface of the printed circuit board 2. The bearing device 3 includes a bottomed housing 8, an oil-impregnated metal 9,
A thrust receiver 10 and one end inserted into the thrust receiver 10
And a shaft 11 fixed at the center of the shaft. The rotor 4 includes a rotor yoke 12 and a magnet 1 fixed thereto.
The shaft 11 is fixed to the center of the rotor yoke 12. The rotor yoke 12 surrounds the periphery of the stator 1 and is rotatably supported by the bearing device 3.

The cover 5 is a lightweight shell made of a thin metal. The cover 5 covers the rotor 4, and an end of the cover 5 is in contact with the outer peripheral end of the stator mounting surface of the printed circuit board 2 and is fixed by soldering.

The motor configured as described above is directly mounted on a board (not shown) of the device. The motor is reflow-soldered with the lands on the substrate of the device at the lands (2a, 2e in FIG. 1) on the bottom surface. A motor drive circuit (not shown) is provided on a substrate of the device, and excites and controls the stator 1 via terminals (lands 2a). Then, the magnet 13 is driven to rotate the rotor 4. Since the rotor 4 has the unbalanced weight 14, vibrations accompanying the rotation of the rotor 4 are transmitted to the device, and information such as a call and an alarm can be transmitted to the wearer.

As described above, in the motor according to the present embodiment, the wire holder 15 is disposed on the end face near the outer peripheral portion of the core 6. This makes it possible to easily perform line processing in an extremely small motor in which a line processing structure cannot be formed on the inner annular portion of the core. Therefore, automatic line processing can be performed even with a very small motor, and the productivity of the motor is improved.

The terminal 7a of the coil 7 is directly connected to the land 2b by soldering at a portion passing through the end face of the wire holder 15. Since connection is made without a relay terminal, the present invention is suitable for an extremely small and small motor in which a relay terminal or the like is not provided. Further, since reflow soldering can be performed on a printed circuit board, a large number of motors can be assembled at a time, thereby improving the productivity of the motors. In spite of this, the wire holder of the present embodiment does not have a hook-shaped projection or the like as in the structure described in the conventional example, and it is not necessary to make a hole in the printed circuit board.

The wire holder 15 further maintains an interval between the core 6 and the printed circuit board 2 on the outer peripheral side of the core 6.
Even when the stator 1 is a very small member, the posture during assembly can be stabilized, so that the quality in the assembly process is improved and the quality of the motor is improved. In addition, when the bearing device 3 is supported by the core 6, the bearing device 3 can play a role as a structure, so that the ability to support an impact load or the like applied to the bearing is increased and the reliability of the motor is improved.

In the motor of the present embodiment, the wire holder 15 is a substantially ring-shaped member made of an insulating material, has an outer diameter larger than the winding portion of the coil 7 of the core 6, and is provided on the end face side of the core 6. It is arranged. Since the core 6 is attached to the core at the outer periphery from the part where the coil is wound,
In particular, in a small motor, line processing can be easily performed to improve the productivity of the motor, and a thin motor can be obtained because the motor can be arranged on the same plane as a portion occupied by the coil.

The wire holder 15 has a projection 15a on the end face of the outermost periphery between the salient poles of the core 6, and is engaged and held. Since the engagement is held in the space between the salient poles, a strong holding structure can be configured without increasing the size of the motor. Further, the end surface of the wire holder 15 has a concave portion 15b for accommodating the coil terminal. The terminal of the coil is housed in the concave portion and connected to the land, and the portion other than the concave portion 15b contacts the printed board to perform the function of maintaining the interval between the core and the printed board.

The wire holder 15 has a region 15c other than the concave portion.
, But the salient poles of the core 6 overlap the area. When the area in contact with the printed board 2 is located at the position of the salient pole of the core, the supporting rigidity between the core and the printed board is increased, and a strong holding structure is obtained. Further, since the outer diameter of the wire holder 15 is substantially equal to or smaller than the outer diameter of the core 6, the air gap between the core 6 and the magnet 13 on the outer periphery thereof is not affected. Further, when a concave portion 15d for accommodating the coil terminal 7a is provided between the salient poles in the rotational direction on the outer peripheral surface of the wire holder 15, the terminal 7a can be accommodated without reducing the outer diameter of the wire holder 15.

In the motor of this embodiment, the terminal 7a
And the land 2b, the wire holder 15 and the printed circuit board 2
And are connected at the part between them. This structure is particularly suitable when there is no space for the terminal support structure, and the position of the coil terminal with respect to the printed circuit board can be reliably set without variation, thereby improving the quality of the motor.

In the motor according to the present embodiment, an end holding portion 15e for holding the end of the coil end 7a is provided on the inner peripheral side of the wire holder 15. Since it is at a position suitable for fixing the coil end 7a via the outer periphery and the end face of the wire holder 15, the wire processing workability is good, and the productivity of the motor is improved.

The end holding portion 15e is arranged between salient poles of the core 6. Since the holding section is formed in the idle space, the motor can be made small without increasing the volume of the stator.

Further, in the motor of this embodiment, the terminal 7a of the coil is held by the terminal end holding portion 15e via the outer peripheral side and the end face side of the wire holder 15. In a state where the terminal 7a is oriented in the inner peripheral direction, a portion close to the terminal is fixedly connected, so that the terminal is retained in the inner peripheral direction. On the other hand, if the terminal is held at the end from the end surface of the wire holder via the outer peripheral surface, the part from the fixed connection to the end may be insufficiently held, and in the worst case, the end moves to the rotor side. Can cause a bite lock.
At this time, according to the present invention, such a situation can be prevented.
Therefore, good quality of the motor can be maintained.

(Embodiment 2) FIG. 4 is a side sectional view of a motor according to another embodiment of the present invention. FIG. 5A is a plan view of a stator of the motor, and FIG. 5B is a side sectional view thereof. FIG. 6A is a plan view of a wire holder incorporated in the stator, FIG. 6B is a side sectional view thereof, and FIG.
Is a bottom view thereof. The description of the same parts as those in the first embodiment will be omitted.

The stator 21 is formed by winding the coil 27 after covering the surface of the core 6 with an insulating film.
Further, a wire holder 35 is provided between the wire holder 35 and the stator 21. The terminal 27 a of the coil 27 is held from the outer peripheral side to the inner peripheral side of the wire holder 35 via the end face side, and can be connected to the printed circuit board 22.

As the printed board 22, a double-sided through-hole board is used. There are lands 22a and 22e on the bottom surface of the printed circuit board 22. There are also a plurality of lands 22b on the stator mounting surface side. The terminal 27a of the coil 27 is soldered to the land 22b. The land 22b is electrically connected to the land 22a on the bottom surface through a through hole 22d.

As described above, the motor according to the present embodiment is provided with the terminal holding portion 35e for holding the terminal end of the coil terminal 27a on the inner peripheral side of the wire holder 35, and the terminal holding portion is provided between the printed circuit board and the outermost peripheral portion of the wire holder. Has a space 35f in which a land can be arranged.
The terminal 27a and the land 22b are held by the terminal end holding part 35e via the outer peripheral side and the end face side of the terminal 5 and the space 35f. The land is located between the salient poles of the core, and the terminal is guided radially inward from the outer periphery, so that the terminal connection portion can be observed through the core. Thereby, the connection quality can be observed and confirmed, and the quality of the motor is improved. Also,
The corner of the wire holder that contacts the terminal is formed in an R shape.
Therefore, the stress applied to the ends of the wires can be reduced, and the reliability of the motor improves.

Although several embodiments have been described above,
The present invention is not limited to the above embodiments, and various applications and developments are possible within the scope of the present invention.

[0059]

As is apparent from the above description, the brushless motor of the present invention can easily perform wire processing while keeping the shape of the motor small and thin by the wire holder provided on the outer peripheral side of the core. Productivity is improved, quality is improved, and reliability is improved.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a motor according to a first embodiment of the present invention.

2A is a plan view of a stator of the motor, and FIG.

3A is a plan view of a wire holder incorporated in a stator, FIG. 3B is a sectional side view of the wire holder, and FIG.

FIG. 4 is a side sectional view of a motor according to another embodiment of the present invention.

FIG. 5A is a plan view of a stator of the motor, and FIG.

6A is a plan view of a wire holder incorporated in a stator, FIG. 6B is a cross-sectional side view thereof, and FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 21 Stator 2, 22 Printed circuit board 2a, 2b, 2e, 22a, 22b, 22e Land 2d, 22d Through hole 3 Bearing device 4 Rotor 5 Cover 6 Core 7, 27 Coil 7a, 27a Terminal 8 Housing 9 Oil impregnated metal 10 Thrust Receiver 11 Shaft 12 Rotor yoke 13 Magnet 14 Unbalance weight 15, 35 Wire holder 15a, 35a Projection 15b, 35b End recess 15c, 35c Area other than recess 15d, 35d Outer peripheral recess 15e, 35e Terminal holding part 35f Terminal holding part Space provided near

────────────────────────────────────────────────── ─── Continued on the front page (72) Mikio Umehara, Inventor 1006 Odakadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-10-309054 (JP, A) JP-A-9- 56103 (JP, A) JUJU 7-42209 (JP, Y2) (58) Fields surveyed (Int. Cl. ⁷ , DB name) B06B 1/00-3/04 H02K 3/30-3/52

Claims (6)

(57) [Claims] 1. A semiconductor device comprising: a core, a coil, a wire holder, and a printed circuit board, wherein the core has a plurality of salient poles projecting in an outer peripheral direction, and the coil is wound around the salient pole and has a terminal. The wire holder is a member made of an insulating material, is disposed on an end face near the outer peripheral portion of the core, and an end of the coil is held by the wire holder via the end face, The printed circuit board is disposed adjacent to the wire holder, has a land on the wire holder side, and a terminal of the coil is connected to the land at a portion passing through an end surface side of the wire holder; Further, a brushless motor in which a distance between the core and the printed circuit board is maintained on an outer peripheral side of the core. 2. A semiconductor device comprising: a core, a coil, a wire holder, and a printed circuit board, wherein the core has a plurality of salient poles projecting in an outer peripheral direction, and the coil is wound around the salient pole and has a terminal. The wire holder is a substantially ring-shaped member made of an insulating material, has a larger outer diameter than the coiled portion of the core, is disposed on the end face side of the core, and the wire holder is Having an engaging portion protruding from the wire holder between the salient poles of the core, engaging with the end face side of the core, and the terminal of the coil is held by the wire holder via the end face side. The printed circuit board is disposed adjacent to the wire holder, has a land on the wire holder side, the terminal of the coil is connected to the land at a portion passing through the end face side of the wire holder, Wa The brushless motor, wherein the ear holder further keeps an interval between the core and the printed board on an outer peripheral side of the core. 3. The brushless motor according to claim 1, wherein the terminal and the land are connected at a portion sandwiched between the wire holder and the printed board. 4. The brushless motor according to claim 1, wherein a terminal holding portion for holding a terminal of the coil terminal is provided on an inner peripheral side of the wire holder. 5. A terminal holding portion for holding a terminal end of a coil is provided on an inner peripheral side of a wire holder, and the terminal of the coil is held by the terminal holding portion via an outer peripheral side and an end surface side of the wire holder. The brushless motor according to claim 1. 6. A terminal holder for holding a terminal end of a coil on an inner peripheral side of a wire holder, the terminal holder having a space between the outermost peripheral portion of the wire holder and a land of a printed circuit board. 3. The terminal according to claim 1, wherein the terminal of the coil is held by the terminal end holding portion via an outer peripheral side and an end face side of the wire holder, and the terminal and the land are connected in the space. 4. Brushless motor.