JP2002238200A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To promote cost reduction of an internally revolving motor having a printed board. SOLUTION: With respect to the motor, in which a rotor revolves in a stator 4 and which includes the printed board 2 installed on a plane opposite the end face of the rotor in the axial direction, a lead wire 16 from a drive coil 10 of the stator 4 is connected with a conductive pin 15 provided on an insulating stator frame 12, and the conductive pin 15 is inserted into an insertion hole 18 formed in the printed board 2. A conductive portion 19, based on the conductive pin 15, is formed on the outer face side of the printed board 2, or the anti-rotor side face of the printed board, and a solder 30 is applied to the conductive portion 19 from the outside face side of the printed board 2, so that the lead wire 16 and an electronic circuit required for the operation of the motor, formed on the printed board 2, form a closed circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor having a printed circuit board on which electronic circuits required for operation are provided.

[0002]

2. Description of the Related Art There are various types of motors with a built-in printed circuit board constituting an electronic circuit. A typical example is a brushless motor that detects the position of a rotor and controls the timing of energizing a drive coil of a stator. . In a brushless motor, a magnetic detection element such as a Hall element for detecting a position of a rotor is provided on a printed circuit board in a form facing the rotor. In this type of motor, electrical connection between a lead wire of a driving coil and a circuit pattern of a printed circuit board often poses a problem.
Japanese Patent Application Laid-Open Publication No. Hei 4-133648 and Japanese Patent Application Laid-Open No. 4-133648 disclose techniques for solving the problem of connection of lead wires of a drive coil.

[0003] The former is a technique for eliminating the low connection strength by directly connecting a lead wire of a drive coil and a circuit pattern, and automating the assembly of an external rotation type brushless motor. As shown in FIG. 13, when the circuit pattern of the printed board 50 faces the drive coil 51, the lead pin 55 and the circuit pattern are electrically connected by the conductor pins 54 with the insulating sleeve 53 attached. is there. Also, there is disclosed a technique in which when the circuit pattern of the printed circuit board 50 is on the opposite surface of the drive coil 51, the lead wire 55 and the circuit pattern are electrically connected by the conductor pins 54.

[0004] The latter is a technique for eliminating the troublesome work of assembling an axial type brushless motor by directly soldering a lead wire of a drive coil and a circuit pattern. A technique for electrically connecting a lead wire and a circuit pattern on a printed circuit board is disclosed.

[0005]

However, it is difficult to apply the above-mentioned conventional technique relating to connection between the lead wire of the drive coil and the circuit pattern to an internal rotation type motor. That is, in the inner rotation type motor, the printed circuit board is provided on the end face of the stator so as to face the end face, and the lead wire of the drive coil must be electrically connected to the outer surface side of the printed circuit board for manufacturing. If the technology related to the conductor pin 54 and the holding metal shown in JP-A-61-147762 and JP-A-4-133648 is applied, the lead wire 5 can be obtained.
5 can be arranged from one side of the printed circuit board 50 to the other side. For example, the conductor pin 54 and the lead wire 5
The connection with 5 must be made before assembling the printed circuit board 50, and cannot be performed by the internal rotation type. Accordingly, brushless motors having an internal rotation type motor, particularly a printed circuit board having a magnetic detection element for detecting the magnetic pole of the rotor mounted on the rotor side, have used an expensive printed circuit board with double-sided through holes.

The present invention has been made to solve such a conventional problem, and its object is to solve the following problems.
An object of the present invention is to promote cost reduction of a motor having a printed circuit board of an inner rotation type, and to obtain a motor having a printed circuit board of an inner rotation type which is easy to manufacture.

[0007]

According to a first aspect of the present invention, a drive coil is wound around a plurality of magnetic pole pieces separated by slots, and the rotor is surrounded by the magnetic pole pieces. A stator provided with a rotating part in the center and housed in an insulated stator frame, a rotor rotatably supported in the rotor rotating part of the stator, and an axial direction of the rotor mounted on the stator frame. For a motor having an end face and a printed board mounted face-to-face, the lead wire of the drive coil of the stator is connected to the conductive pin provided on the stator frame, and the conductive pin is formed in the printed board. To form a conductive portion by conductive pins on the outer surface side of the printed circuit board on the anti-rotor side, and formed a lead wire and a printed circuit board by soldering the conductive portion from the outer surface side of the printed circuit board. motor A means is adopted in which the electronic circuit necessary for the operation of the controller is a closed circuit.

According to a second aspect of the present invention, there is provided a motor having a conductive portion and a printed circuit board formed by filling the through hole of the printed circuit board with solder from the outer surface side. In this case, the electronic circuit necessary for the operation of (1) is a closed circuit.

In order to achieve the above object, a third aspect of the present invention relates to a method of soldering from the outer surface side of a printed board in the means according to the first aspect, wherein a lead wire and an electronic circuit of the printed board are connected via solder. Means for interposing a connection member made of a conductive material to be electrically connected is employed.

In order to achieve the above object, a fourth aspect of the present invention is directed to the means according to the third aspect, wherein a hole connected to an electronic circuit of the printed circuit board is arranged near the insertion hole for inserting the conductive pin of the printed circuit board. And a connecting member, having a terminal portion having a hole to be inserted into the conductive portion protruding from the insertion hole of the printed circuit board to the outer surface side, and a bridging portion which is connected to the electronic circuit by being inserted into the removed hole. Means for constituting a member is adopted.

According to a fifth aspect of the present invention, in order to achieve the above object, the lead wire and the electronic circuit of the printed circuit board are electrically connected via solder to the insertion hole of the printed circuit board in the means according to the second aspect. A means for interposing a connecting member made of a conductive material is used.

According to a sixth aspect of the present invention, there is provided an electronic circuit of a printed circuit board according to any one of the first to fifth aspects of the present invention, wherein the electronic circuit includes: Means for disposing a magnetic detection element for detecting the magnetic pole of the rotor is employed.

[0013] In order to achieve the above object, an invention according to claim 7 is that in the means according to any one of claims 1 to 6, the stator frame is provided with a plurality of projections aligned with the conductive pins,
The printed circuit board is provided with an engagement hole with which each projection is engaged,
Means for determining the position of the printed board by the engagement between the projection and the engagement hole is employed.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 This embodiment shown in FIGS. 1 to 10 relates to an internal rotation type brushless motor including a printed circuit board 2 inside which an electronic circuit 1 (see FIG. 6) necessary for operation is provided. This brushless motor has a motor shell 3 as shown in FIG.
, And a rotor 7 whose output shaft 6 is supported at both ends by two bearings 5 on the motor outer shell 3. The stator 4 is configured by winding a drive coil 10 around a stator core 9 having a plurality of pole pieces 8 separated by slots. At the center of the stator core 9, a rotor rotating part 11 surrounded by the pole pieces 8 is formed. The stator core 9 has a laminated structure in which thin silicon steel sheets are laminated, and both sides are insulated and covered with a stator frame 12 made of insulating plastic or the like, and a drive coil 10 is wound thereover. . The rotor 7 is configured by integrating an output shaft 6 with an armature 13 composed of a permanent magnet.
The armature 13 is supported on the motor outer shell 3 via the bearing 5 on the output shaft 6 so that the armature 13 can rotate in the rotor rotating portion 11 of the motor.

On one side of the stator frame 12, a plurality of projections 14 projecting in the direction of the center line are formed on the circumference as shown in FIG. In the present embodiment, twelve protrusions 14 are formed at intervals of 30 degrees. Also, the stator frame 12 has
Six holes are formed at intervals of 30 degrees alongside the protrusions 14, and conductive pins 15 made of a conductive material longer than the protrusions 14 are fitted into the holes and protrude in the center line direction. Each of the lead wires 16 of the drive coil 10 is entangled with these six conductive pins 15 so as to be electrically connected to the drive coil 10 (see FIG. 2). A ring-shaped print shown in FIGS. 4 and 5 in which the electronic circuit 1 as shown in FIG. 6 necessary for the operation of the motor is printed on one surface of the stator frame 12 by the twelve protrusions 14. The substrate 2 is mounted so as to face the axial end surface of the rotor 7 (see FIGS. 1 and 2).

The printed circuit board 2 is provided with twelve engagement holes 17 corresponding to the twelve projections 14 of the stator frame 12.
Further, six insertion holes 18 through which the six conductive pins 15 are inserted are provided.
Is also provided. The end of each of the six conductive pins 15 serves as a conductive portion 19 in the insertion hole 1 of the printed circuit board 2.
8 protrudes from the outer surface of the printed circuit board 2 on the side opposite to the rotator (see FIG. 2). On the printed circuit board 2, a circuit pattern 20 is printed on the inner surface on the rotor side, and three magnetic detecting elements 21 such as Hall elements for detecting the magnetic pole position of the rotor 7 face the end of the rotor 7. (See FIG. 4). Two thermal fuses 22 and terminals 23 are provided on the outer surface side of the printed circuit board 2 (see FIG. 5). These electronic components constitute an electronic circuit 1 as shown in FIG.

In the vicinity of the six insertion holes 18 of the printed circuit board 2, one through hole 24 electrically connected to the circuit pattern 20 on the inner surface side of the printed circuit board 2 is provided. Each of the conductive portions 19 of the conductive pins 15 located on the outer surface side of the printed circuit board 2 and the circuit pattern 20 on the inner surface are electrically connected by the connecting member 25 made of a conductive material through the hole 24. (See FIG. 2). As shown in FIGS. 7 and 8, the connection member is a ring-shaped terminal portion 27 having a hole 26 inserted into the conductive portion 19.
And a bridging portion 29 that penetrates the hole 24 from the outer surface side to the inner surface side. The respective bridging portions 29 are inserted through the respective holes 24. The conductive portion 19 and the terminal portion 27 are soldered from the outer surface side, and the end of the bridging portion 29 and the circuit pattern 20 on the inner surface are connected by solder 30, so that the electronic circuit 1 as shown in FIG. ing.

The soldering of the conductive portion 19 and the connecting member 25 can be easily performed by an external operation in the assembling process, and the automation thereof is also easy. Since the printed board 2 has a single-sided non-through hole, the cost of the printed board 2 is greatly reduced. As shown in FIGS. 9 and 10, the connecting member 25 may be configured such that the terminal portion 27 is provided with an arc-shaped contact surface 31 for abutting on the conducting portion 19 instead of the hole 26. When the structure of the portion 27 is employed, the assembling is easy because the connecting member 25 does not fall off during assembly. In addition, as long as it is an internal rotation type motor having the printed circuit board 2, the connection technology relating to the lead wire 16 described above can be applied even if it is not a brushless motor.

Embodiment 2 In the present embodiment shown in FIGS. 11 and 12, another device for simplifying the electrical connection between the conductive pins and the circuit pattern of the brushless motor shown in the first embodiment has been devised. Is the same as that of the first embodiment. Therefore, the same portions as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and description thereof will be omitted.

The brushless motor according to the present embodiment shown in FIG.
The insertion hole 18 for inserting the conductive pin 15 is formed slightly larger than the outer diameter of the conductive pin 15 without providing the extraction hole 24 for inserting the
A gap 32 is formed between the conductive pin 15 and the insertion hole 18. An L-shaped connection member 33 is inserted into the gap 32 from the inner surface side, and the conductive portion 19 of the conductive pin 15 and one end of the connection member 33 are connected by soldering from the outside, and the other end of the connection member 33 is connected. To the internal circuit pattern 20
And solder 30.

As shown in FIG. 12, a lead wire 16 is wound on the base side of the conductive pin 15 so as to reach the inner circuit pattern 20 with a diameter larger than that of the insertion hole 18, and the conductive portion 19 of the conductive pin 15 is wound. The solder 30 flows into the insertion hole 18 from the side and fills the insertion hole 18, and the winding portion 34 of the lead wire 16 is wound.
The connection with the circuit pattern 20 can be performed by the solder 30 that has spread throughout the circuit.

By adopting such a configuration, it is not necessary to provide the hole 24, so that the manufacturing becomes easy.
The connection members 33 and the connection members 25 can be omitted.
Other functions are the same as those of the first embodiment.

[0023]

According to the first aspect of the present invention, it is possible to reduce the cost of a motor having a printed circuit board of an internal rotation type in a form that is easy to manufacture.

According to the second aspect of the present invention, the cost can be reduced together with the effect according to the first aspect.

According to the third aspect of the invention, the connection between the lead wire and the electronic circuit on the printed circuit board is stabilized in addition to the effect according to the first aspect.

According to the fourth aspect of the present invention, assembling is facilitated together with the effect according to the third aspect.

According to the fifth aspect of the invention, the configuration of the printed circuit board is simplified along with the effect according to the second aspect.

According to the sixth aspect of the present invention, a brushless motor can be configured together with the effects according to any one of the first to fifth aspects.

According to the seventh aspect of the present invention, the printed circuit board can be positioned together with the effect according to any one of the first to sixth aspects, thereby facilitating assembly.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a brushless motor according to a first embodiment.

FIG. 2 is an enlarged sectional view of a stator portion of the brushless motor according to the first embodiment.

FIG. 3 is a side view of a stator of the brushless motor according to the first embodiment.

FIG. 4 is a rear view of the printed circuit board of the brushless motor according to the first embodiment.

FIG. 5 is a front view of a printed board of the brushless motor according to the first embodiment.

FIG. 6 is a circuit diagram showing an electronic circuit of the brushless motor according to the first embodiment.

FIG. 7 is a plan view of a connection member of the brushless motor according to the first embodiment.

FIG. 8 is a side view of a connection member of the brushless motor according to the first embodiment.

FIG. 9 is a plan view of another connection member of the brushless motor according to the first embodiment.

FIG. 10 is a side view of another connection member of the brushless motor according to the first embodiment.

FIG. 11 is an enlarged sectional view of a stator portion of the brushless motor according to the second embodiment.

FIG. 12 is an enlarged cross-sectional view of another stator portion of the brushless motor according to the second embodiment.

FIG. 13 is an enlarged sectional view of a stator portion of a conventional brushless motor.

[Explanation of symbols]

1 electronic circuit, 2 printed circuit board, 4 stator,
7 rotor, 8 pole pieces, 9 stator core, 10
Drive coil, 11 rotor rotating section, 12 stator frame, 14 protrusion, 15 conductive pin, 16 lead wire, 17 engaging hole, 18 insertion hole, 19 conductive section, 20 circuit pattern, 21 magnetic detecting element,
24 extraction hole, 25 connection member, 26 hole, 27
Terminal part, 29 bridge part, 30 solder, 33 connecting member.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazuhiko Hotta 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 5H019 AA10 BB05 BB15 BB18 BB22 CC03 DD01 EE09 5H604 AA08 BB01 BB07 BB14 BB17 CC01 CC05 QB04 QB14

Claims (7)

[Claims] A drive coil is wound around a plurality of magnetic pole pieces separated by slots, and a rotor rotating portion surrounded by these magnetic pole pieces is provided at the center, and is housed in an insulating stator frame. A stator, a rotor rotatably supported in the rotor rotating portion of the stator, and a printed circuit board mounted on the stator frame so as to face the axial end face of the rotor. A motor, wherein a lead wire of a drive coil of the stator is connected to a conductive pin provided on the stator frame, and the conductive pin is inserted through an insertion hole formed in the printed board, so that a reverse of the printed board is formed. A conductive portion is formed by the conductive pin on the outer surface side that is the rotor side surface, and the lead wire and the motor configured on the same printed circuit board are operated by soldering the conductive portion from the outer surface side of the printed circuit board. necessary Motor with a closed electronic circuit. 2. The motor according to claim 1, wherein an electronic circuit required for operation of the motor formed on the conductive portion and the printed circuit board by filling the insertion hole of the printed circuit board with solder from the outer surface side is a closed circuit. The motor that is. 3. The motor according to claim 1, wherein the conductive material electrically connects the lead wire and the electronic circuit of the printed circuit board via the solder when soldering from the outer surface side of the printed circuit board. Motor with interposed connection members. 4. The motor according to claim 3, wherein holes for connecting to an electronic circuit of the printed circuit board are provided in the vicinity of the insertion holes for inserting the conductive pins into the printed circuit board, and the connection member is provided on the printed circuit board. A motor configured as a substantially L-shaped member having a terminal portion having a hole inserted into a conductive portion protruding outward from an insertion hole of a substrate, and a bridge portion connected to an electronic circuit by being inserted through the hole. 5. The motor according to claim 2, wherein a connection member made of a conductive material for electrically connecting the lead wire and an electronic circuit of the printed circuit board to the insertion hole of the printed circuit board via solder is provided. Motor. 6. The motor according to claim 1, wherein an electronic circuit of the printed circuit board is formed on an inner surface side of the motor, and the electronic circuit includes a magnet for detecting a magnetic pole of a rotor. Motor that contains the sensing element. 7. A motor according to claim 1, wherein a plurality of projections are provided on the stator frame, the projections being arranged on the conductive pins, and the projections are engaged with the printed circuit board. A motor having a mating hole, wherein the position of the printed circuit board is determined by the engagement between the projection and the engagement hole.