JPS639249Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a coil mounting structure for a flat brushless motor.

FIG. 1 shows an example of the basic structure of a conventionally known flat type brushless motor. In FIG. 1, 1 is a mounting frame, 2 is a bearing, 3 is a rotating shaft, 4 is a mounting boss, 5 is a yoke, 6 is a ring-shaped magnet, and 7 is a yoke, which together with the magnet 6 constitute a magnetic circuit. 8 is a plurality of coils. The yoke 5 and the magnet 6 constitute a rotor, and the yoke 7 and the coil 8 constitute a stator. The magnet 6 and the coil 8 are arranged opposite to each other with a gap d ₁ in between, and the magnet 6 and the yoke 7 are arranged with a gap d ₂ in between. In the above configuration, when a current is sequentially passed through the plurality of coils 8, this current interlinks with the magnetic flux of the magnet 6, and rotational force is obtained.

FIG. 2 shows another example in which another yoke 5' is attached to the lower end of the rotating shaft 3, and the yoke 7 is replaced with a printed circuit board 7', and the yoke 5' is connected to the printed circuit board 7' with a gap d. They are placed facing each other with ₃ sides in between. This type of motor is known to have high torque and high efficiency.

As shown in FIG. 3, the coil 8 used in the above-mentioned flat brushless motor has a generally triangular outer shape and an inner diameter hole 8a.
is formed and the terminal 8b is derived. In the case of forming such a coil 8, a self-bonding conductor wire having a core wire made of copper or the like and an adhesive film coated on the outside has conventionally been widely used. When such self-fusing conducting wires are wound with a winding machine to form a coil, the adhesive film is melted by alcohol or the like, and the conducting wires are bonded to each other. The coil is then dried in the final step of winding to maintain the coil shape as shown in FIG.

A plurality of coils 8, such as four, six, eight, etc., are usually used for one motor.
For example, when six coils 8 are used, these coils 8 are arranged as shown in FIG.
(or printed circuit board 7') and stator 1
4 is composed. In this case, conventionally the coil 8 was fixed to the yoke 7 by adhesive or screwed through a printed circuit board or an insulator such as insulating paper. For this reason, installation work requires time and effort, and when insulating paper is used, the gap d ₂ between the magnet 6 and the yoke 7 increases by the thickness of the insulator, which increases the magnetic resistance in the gap d ₂ . This caused a decrease in motor efficiency. Furthermore, it is important to accurately position and arrange the coil 8 on the yoke 7, but this positioning work is very troublesome and requires assembly jigs, etc., which increases equipment costs. I was invited. Further, as shown in FIG. 5, by attaching a coil 8 wound around a synthetic resin bobbin 9 with flanges 9a and 9b on both sides to the motor frame 1, the coil 8
A device is known in which the positioning is performed. In this method, in the case of the motor shown in FIG. 2, the bobbin 9 is attached to the frame 1 via a mounting plate integrally formed with the flange 9a or 9b.
Therefore, the installation work is time-consuming, and this method requires a gap d ₂ equal to the thickness of the flange or mounting plate.
will increase. Therefore, when the thickness of the flange or the mounting plate is reduced, the mounting strength decreases, and the flange or the mounting plate may become warped or otherwise deformed due to heat generation of the coil 8 or the like. Furthermore, as shown in FIGS. 1 and 2, since the entire coil 8 is housed within the outer frame of the motor, there is a drawback that the outer diameter of the entire motor becomes large.

This invention is intended to solve the above problems.
Embodiments of the present invention will be described below with reference to the drawings.

Figure 6 shows a flangeless bobbin 10 according to the present invention.
This shows a first embodiment of the bobbin 10.
It is made by integrally molding synthetic resin such as PBT. The bobbin 10 includes a substantially triangular plate member 12 having a substantially V-shaped coil winding groove 11 formed on its circumferential surface.
A support member 13 provided on one side edge of this plate-like member 12, guide grooves 14 and 15 provided on both sides of the upper part of this support member 13, and a protrusion provided with a retaining protrusion 16 at the tip. 17, and the support member 1
3 and a guide piece 18 provided below are each integrally formed. Note that the guide grooves 14, 1
5 and the protrusion 16, the bobbin mounting plate 1 which will be described later
9 constitutes a fitting attachment portion of the bobbin 10.

FIG. 7 shows a bobbin 10 with a coil 8 wound thereon. The coil 8 is wound around the winding groove 11 and is held between the lower surface 13a of the support member 13 and the guide piece 18. In this state, the winding groove 11 is V
Since the coil 8 is shaped like a letter, even if a vertical force is applied to the coil 8 as shown by the arrow, the coil 8 will not fall off. The shape of the wound portion of the coil 8 may be various in addition to the above. For example, instead of the V-shaped groove 11 in the first embodiment, an arc-shaped groove may be formed. Further, fine irregularities may be formed on the circumferential surface of the plate-like member 12, or a convex portion or a concave portion provided with a stepped portion may be formed. In short, any structure may be used as long as the plate-like member 12 is provided with a position regulating surface on its circumferential surface for regulating the movement of the coil 8 in the axial direction.

FIG. 8 shows a state in which a bobbin 10 around which a coil 8 is wound is attached to a motor of the type shown in FIG. A bobbin mounting plate 19 is provided on the bearing 2 of the motor,
The bobbin 10 is positioned and attached to this attachment plate 19. Note that 20 is a collar through which the rotating shaft 3 is inserted.

FIG. 9 shows how the bobbin 10 is attached to the bobbin attachment plate 19. The mounting plate 19 has a disk shape, and is provided with a plurality of notches 21 according to the arrangement of the coils 8. An engagement hole 22 is provided in each notch 21.
A protruding piece 19a is provided. Bobbin 1
0 fits the side edges 21a and 21b of the notch 21 into the guide grooves 14 and 15 and slides them in the direction of the arrow, and then engages the protrusion 16 with the engagement hole 22,
Due to the protruding piece 17 and the upper surface 13b of the support member 13,
It is immovably fixed by elastically holding the protruding piece 19a. Side edges 21a, 2 of the notch 21
1b and the engagement hole 22, the bobbin 10
The fitting part to be attached corresponds to the above-mentioned fitting attachment part.

FIG. 10 shows the bobbin 10 attached to a motor of the type shown in FIG. The bobbin 10 used in this case is one in which a support member 23 is further provided below the guide piece 18. This support member 23 is connected to the printed circuit board 7' as shown in the figure.
is attached by screws 24. Furthermore, Figure 9,
In FIG. 10, the outer peripheral portion of the coil 8 held between the support member 13 and the guide piece 18 is a portion that does not interlink with the magnetic flux of the magnet 6. That is, this part is unrelated to the characteristics of the motor.

11 and 12 show the second bobbin 10,
This shows a third embodiment, in which the shape of the coil winding portion is changed. In the embodiment shown in FIG. 11, the coil winding portion 11a is made to protrude in a V-shape to prevent the coil 8 from falling off in the direction of the arrow. Further, in the embodiment shown in FIG. 12, a projection 11b is provided on the coil winding portion to prevent the coil from falling off in the direction of the arrow.

13 and 14 show fourth and fifth embodiments of the bobbin 10, in which the lower surface 1 of the support member 13 is
3a and the side cross-sectional shapes of the guide piece 18 are changed.

FIG. 15 shows a sixth embodiment of the bobbin 10 and a bobbin mounting plate 19 to which the bobbin 10 is mounted. In this embodiment, fitting protrusions 26 and 27 are provided on both sides of the upper part of the support member 13, and a projecting piece 29 in which an engaging hole 28 is provided is provided. On the other hand, the bobbin mounting plate 19 has the above-mentioned engagement hole 28.
The retaining protrusion 30 that engages with the protrusion 26 and the protrusion 26, 2
Guide grooves 31 and 32 are provided along the side edges of the notch 21 into which the grooves 7 are fitted. In this case, the fitting protrusions 26, 27 and the engaging hole 28
constitutes the fitting attachment portion of the bobbin 10, and the engaging piece 30 and the guide grooves 31, 32 constitute the attached fitting portion of the bobbin attachment plate 19.

By attaching the bobbin 10 of each of the above-described embodiments to a motor as shown in FIGS. 9 and 10, the following effects can be obtained.

(1) Since this bobbin 10 has no flange, the gap _d2 between the magnet 6 and the yoke 7 can be minimized, improving the performance of the motor.

(2) Since the bobbin 10 can be easily installed in the specified position by simply inserting it from the side of the motor, the number of man-hours required for assembling the motor can be greatly reduced, and no jigs or tools are required for installation. do not.

(3) Since the outer circumferential portion of the coil 8 is exposed to the outside, the outer diameter of the motor can be made smaller by the outer circumferential portion, compared to the cases shown in FIGS. 1 and 2.

The present invention comprises a magnet 6, a yoke 7 that forms a magnetic circuit together with the magnet, a rotating shaft 3 provided integrally with the magnet, and an engagement hole 22 provided on the rotating shaft via a bearing 2. Or a bobbin mounting plate 19 provided with a retaining protrusion 30
, a plurality of notches 21 provided on the peripheral edge of the bobbin mounting plate, a side edge 21a of the notch,
21b or an attached fitting portion consisting of guide grooves 31 and 32 provided along this side edge, and guide grooves 14 and 1 that fit into the side edge or the guide groove.
5 or a fitting mounting portion consisting of protrusions 26 and 27 and an engagement hole 2 that engages with the retaining protrusion or the engagement hole.
8 or a plurality of bobbins 10 provided with retaining protrusions 16 and a plate-like member 12, and a plurality of coils 8 wound around the circumferential surface of the plate-like member and disposed opposite to the magnet. This relates to a flat type brushless motor consisting of.

Therefore, according to the present invention, since the coil mounting member can be easily mounted in a predetermined position by simply inserting it, the number of man-hours required for assembling the motor can be greatly reduced, and the jigs and tools required for mounting can be greatly reduced. The cost of this type of motor can be reduced.

[Brief explanation of the drawing]

1 and 2 are schematic cross-sectional side views showing an example of the basic structure of a flat brushless motor to which the present invention can be applied, FIG. 3 is a perspective view of a coil, and FIG. 4 is a diagram of a conventional stator. A plan view, FIG. 5 is a perspective view of a conventional bobbin, FIG. 6 is a perspective view showing the first embodiment of the present invention, and FIG. 7 is a side view of the coil wound.
Figure 8 is a side view showing the bobbin according to the present invention attached to the motor of the type shown in Figure 1, Figure 9 is a perspective view showing how the bobbin is attached to the bobbin mounting plate, and Figure 10 is the bobbin according to the present invention. 1 is a side view showing the state in which the motor is attached to the type of motor shown in Fig. 2.
1 to 14 are side views of the main parts of the bobbin showing the second to fifth embodiments of the present invention, and Fig. 15 is a perspective view of the main parts and the main parts of the mounting plate showing the sixth embodiment of the invention. be. In addition, in the symbols used in the drawings, 2...
...Bearing, 3...Rotating shaft, 6...Magnet, 7...
...Yoke, 8...Coil, 10...Bobbin, 12
... Plate member, 14, 15, 31, 32 ... Guide groove, 16, 30 ... Retaining protrusion, 19 ... Bobbin mounting plate, 21 ... Notch, 21a, 21b ...
...Side edge portion, 22, 28...Engagement hole, 26, 27...
…protrusion.

Claims (1)

[Scope of Claim for Utility Model Registration] A magnet, a yoke constituting a magnetic circuit together with the magnet, a rotating shaft provided integrally with the magnet, and an engaging hole or an engagement hole provided on the rotating shaft via a bearing. A bobbin mounting plate provided with a retaining protrusion, a plurality of notches provided at the peripheral edge of the bobbin mounting plate, and a guide groove provided at or along the side edge of the notch. an attached fitting portion consisting of a guide groove or protrusion that fits into the side edge portion or the guide groove; and an engagement hole that engages with the retaining protrusion or the engagement hole; A flat type comprising a plurality of bobbins provided with retaining protrusions and a plate-like member, and a plurality of coils wound around the circumferential surface of the plate-like member and arranged to face the magnet. brushless motor.