JP3286641B2 - 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 brushless motor.

[0002]

2. Description of the Related Art In general, a brushless motor used for a spindle motor, a fan, or the like is provided with a stator integrally provided on an outer periphery of one end of a support cylinder provided on a support member, and a shaft is provided inside the support cylinder via a bearing. Is rotatably supported, and a rotor having a rotor magnet opposed to the outer periphery of the stator is integrally fixed to the shaft.

[0003] In such a brushless motor, in order to switch the multi-phase coil current of the stator, coil wires of each phase are connected to a printed circuit board in which a switching circuit is incorporated. So, the support tube A
5B is soldered to a printed circuit board E fixed on a lower end flange portion D of a support cylinder A, or a coil wire C drawn downward from a stator B provided on the outer periphery of one end portion of the support cylinder A. As shown in FIG. Then, a pin F penetrating the flange portion D is erected on a printed circuit board E disposed below the support cylinder A, and a coil wire C is connected to the pin F. Alternatively, as shown in FIG. Is inserted into the hole G of the flange portion D and connected to the printed circuit board.

[0004]

However, in the conventional brushless motors, since the coil wire C is drawn out in any case, the ones shown in FIGS. 5A and 5B are used for soldering. The space is very small and the soldering work is difficult to do. In the case of FIG.
It is difficult to insert the coil wire C, and the workability is poor. In addition, these structures have a very disadvantageous structure, especially for the recent miniaturization of motors.

SUMMARY OF THE INVENTION The present invention has been made in consideration of such problems of the prior art, and an object of the present invention is to provide a brushless motor in which coil wires can be easily connected. .

[0006]

To SUMMARY OF THE INVENTION To achieve the above object, in the brushless motor of the present invention, the support tube to the outer surface and / or inner surface of the support tube provided with a stator on one end periphery provided in the support member A conductive pattern extending in the axial direction of the conductive pattern is formed, and the upper end of the conductive pattern is
The land on the upper end that is directly connected to the coil wire of the
In both cases, the lower end of the conductive pattern is an external printed circuit board.
Form the land at the lower end directly connected to the wiring pattern of
It is one in which the coil wire is to be pull out <br/> via the conductive pattern.

[0007]

In the brushless motor described above, the coil wire drawn from the stator to one end of the support cylinder is connected to the end of the conductive pattern at one end of the support cylinder, so that the coil wire is connected via this conductive pattern. The end of the conductive pattern at the other end of the support cylinder can be directly attached to the printed board.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described with reference to FIGS. FIG. 1 shows a cross-sectional structure of a brushless motor, in which 1 is a bracket serving as a support member, 2 is a penetrating member mounted on the bracket 1 and a flange portion 3 is fixed to the bracket 1 by screwing and extends in a vertical direction. It is a support cylinder, and a four-pole stator 4 is fixed to the upper outer periphery. In the embodiment, the bracket 1 and the support tube 2 are formed separately, and both are fixed. However, the bracket 1 and the support tube 2 may be formed integrally.

As shown in FIG. 3, the support cylinder 2 has a mounting groove 5 for the stator 4 formed on the upper outer peripheral surface, and four wiring grooves 6 extending vertically in the inner peripheral surface. It is recessed at equal intervals above. Further, a tapered surface 7 is formed at the upper end, and 4
One insert piece 8 is provided. The mounting groove 5
As shown in FIG. 2, swelling portions 9 for preventing rotation are provided at equal intervals in the vertical direction, and are fitted into concave grooves on the inner periphery of the stator 4 so that the stator 4 is prevented from rotating.

In each of the wiring grooves 6 of the supporting cylinder 2, a conductive pattern 10 is formed on the inner bottom surface thereof along the wiring groove 6, and these conductive patterns 10 extend linearly from the upper end to the lower end of the supporting cylinder 2. ing. The land portion 11 at the upper end of the conductive pattern 10 is formed by folding back at the position of the tapered surface 7, and the land portion 12 at the lower end of the conductive pattern 10 is formed on the end surface of the insertion piece 8. An armature coil 22 is wound around the teeth of the stator 4 as required, and a coil wire 13 from the armature coil 22 is connected to the land 11 of each conductive pattern 10 by soldering from above. . Each conductive pattern 10 is desirably covered with an insulating layer (not shown) except for the lands 11 and 12.

Reference numeral 14 denotes a shaft which is inserted inside the support cylinder 2 and is rotatably supported via a pair of bearings 15. Reference numeral 16 denotes a covered cylindrical rotor integrally supported on the upper end of the shaft 14. A rotor magnet 17 is provided on the inner peripheral surface of the cylindrical portion of the rotor 16 facing the outer periphery of the rotor 16. Reference numeral 18 denotes a printed circuit board disposed below the bracket 1. As shown in FIG. 4, fitting holes 19 are provided in correspondence with the respective insertion pieces 8 of the support cylinder 2, and each of the The end 20 a of the wiring pattern 20 is arranged at a position adjacent to the piece 8, and each insertion piece 8
Are fitted into the respective fitting holes 19, and the lands 12 of the respective insertion pieces 8 and the ends 20a of the respective wiring patterns 20 are soldered. The printed circuit board 18 can be attached to the bracket 1 via a spacer, for example.

In the brushless motor having such a configuration, at the time of assembling, each coil wire 13 from the stator 4 fixed to the support cylinder 2 is soldered to the land portion 11 at the upper end of the conductive pattern 10, respectively. Each insertion piece 8 of the support cylinder 2 is fitted into each fitting hole 19 of the printed circuit board 18,
The wiring is completed by soldering the land portion 12 of each insertion piece 8 and the end portion 20a of each wiring pattern 20 respectively. For this reason, the connection of each coil wire 13 can be performed more easily from above, and the disadvantages of the related art can be solved. In addition, since the coil wire 13 is soldered on the tapered surface 7, there is an advantage that this connection portion does not protrude in the outer peripheral direction.

The present invention is not limited to the above embodiment, but can be modified without departing from the spirit of the present invention. For example, although the wiring groove 6 of the support cylinder 2 is formed in accordance with the number of the coil wires 13 of the stator 4,
A relatively wide wiring groove 6 may be formed, and a plurality of conductive patterns 10 may be provided in this wiring groove 6. Further, the land portion 12 at the lower end of the conductive pattern 10 can be connected to a printed board via a lead wire. Further, a conductive pattern 10 can be formed on the outer surface of the support tube 2. In this case, a groove extending in the axial direction is formed on the outer surface of the support tube 2, and a notch is formed at a position corresponding to the groove of the flange portion 3. To form a linear conductive pattern 10 extending in the vertical direction in the groove.

[0014]

Since the present invention is configured as described above, the following effects can be obtained. Since the coil wire of the stator is connected to one end of the conductive pattern formed on the outer surface and / or the inner surface of the support cylinder having the stator fixed to the outer periphery at one end, and the coil wire is drawn out to the other end side of the support cylinder, the coil wire is provided. Connection becomes very easy, workability is improved, and automation thereof is also possible. Further, the coil wire can be easily connected to an external printed circuit board or the like, and the conductive pattern can be aligned with the wiring pattern of the printed circuit board to simplify wiring.

[Brief description of the drawings]

FIG. 1 is a cutaway front view showing an embodiment of a brushless motor according to the present invention.

FIG. 2 is a plan view cut along the line A-A ′ of FIG. 1;

FIG. 3 is a partially cutaway perspective view of a support cylinder of the embodiment.

FIG. 4 is a bottom view of the embodiment.

FIGS. 5A, 5B, and 5C are partially cut front views of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bracket 2 Support cylinder 4 Stator 6 Wiring groove 10 Conductive pattern 13 Coil wire 14 Shaft 15 Bearing 16 Rotor 17 Rotor magnet

Claims (1)

(57) [Claims] 1. A support cylinder provided on a support member and having a stator provided at an outer periphery at one end, a shaft rotatably supported inside the support cylinder via a bearing, and an outer periphery of the stator fixed to the shaft. A brush provided with a rotor magnet opposed to the support cylinder, wherein an outer surface and / or an inner surface of the support cylinder are disposed in an axial direction of the support cylinder.
Forming a conductive pattern extending to the conductive pattern
The upper end is directly connected to the coil wire of the stator
And the lower end of the conductive pattern,
Directly connected to the wiring pattern of the external printed circuit board
By forming the land portion of the end, the brushless motor, characterized in that the coil wire is pull out via the conductive pattern.