JPS6026503Y2 - flat brushless motor - Google Patents

Description

[Detailed description of the invention] The present invention relates to the structure of the stator of a flat brushless motor, and in particular, it reduces the gap between the rotor magnet and the stator yoke, improves the positional accuracy of the coil, improves installation strength, and facilitates assembly. The purpose is to improve sexual quality, etc.

FIG. 1 shows an example of the basic structure of a conventionally known flat type brushless motor.

In Figure 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, 7 is a yoke, and 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 across the gap d□, the magnet 6 and the coil 8 are arranged opposite to each other across the gap d1, and the magnet 6 and the yoke 7 are arranged across the gap so that magnetic is combined with

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 9 is attached to the lower end of the rotating shaft 3, and the yoke 7 is replaced with a printed circuit board 7' to which a coil 8 is connected. The yokes 9 are arranged facing each other with a gap d3 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 morph has a generally triangular outer shape, and has an inner diameter hole 8a formed therein and a terminal 8b drawn out. , and those that tend to have a thick roll are used.

This coil 8 is usually 4 or 6 for one motor.
Plural numbers are used, such as 1, 5, etc.

For example, when six coils 8 are used, these coils 8 are arranged as shown in FIG. 4 and fixed on the yoke 7 or the printed circuit board 7' to form the stator 14.

In this case, conventionally the coil 8 was fixed to the yoke 7 by adhesive via a printed circuit board or an insulator such as insulating paper.

Therefore, the distance between the magnet 6 and the yoke 7 increases by the thickness of the insulator, which increases the magnetic resistance in the distance, resulting in a decrease in motor efficiency.

Furthermore, it is important that the coils 8 are accurately positioned and arranged on the yoke 7, but in the past, the coils 8 were positioned one by one and attached with adhesive or screws, which resulted in poor work efficiency. There was also a problem with its accuracy.

The present invention is intended to solve the above-mentioned problems, and embodiments of the present invention will be described below with reference to the drawings.

FIG. 5 shows a coil mounting member 15 for positioning and mounting six coils 8.

This mounting member 15 is integrally molded from thermoplastic resin such as DURANEX (trade name), and has a ring shape as a whole, and has a coil fitting part 16 that matches the shape of the six coils 8 on the inside. Four pillars 17 are formed that protrude in the vertical direction (axial direction).

To attach the coil 8 to this attachment member 15, as shown in FIG.
After the coil 8 is fitted in, the mounting member 15 is installed and the coil 8 is fitted into each fitting part 16.

Next, the portions 20 indicated by circles are spot welded using ultrasonic waves or heating.

Since the conductive wire used in the coil 8 has an adhesive film applied on top of an insulating film such as enamel, this adhesive film and the mounting member 15 are welded together.

Attachment member 15 to which coil 8 is attached as described above
is fixed to the motor frame 1 via a support 17 as shown in FIG. 7 or 8.

In this case, when the mounting member 15 is applied to the motor of the type shown in FIG.
The lower end is fixed to the yoke 7.

Furthermore, when the mounting member 15 is applied to the type of motor shown in FIG. 2, as shown in FIG.
The yoke 9 of the rotor is arranged between the supports 17 and 17.
The upper end is fixed to the frame 1, and the lower end is fixed to the printed circuit board 7'.

The present invention includes a rotor having a ring-shaped magnet 6;
A frame body 1 rotatably supports the rotating shaft 2 of the rotor, and a plurality of coils 8 disposed facing the magnet 6.
and a yoke 7 on which these coils 8 are arranged and magnetically coupled with the magnet 6, or a printed circuit board 7' to which these coils 8 are connected, in a flat brushless morph. A plurality of fitting parts 16 into which 8 are fitted and a plurality of pillars 1 protruding in the axial direction.
7 is integrally provided with a ring-shaped coil made of synthetic resin, a member 15 is provided, and each coil 8 is fixed to each fitting part 16, and one end of each pillar 17 is attached to the frame. 1, and the other end is fixed to the yoke 7 or the printed circuit board 7'.

Therefore, according to the present invention, the following effects can be obtained.

(1) The coil fitting portion of the mounting member has a winding thickness t of the coil 8.

By making it equal to , the gap d2 can be made smaller.

(2) Less error in coil assembly.

(3) Multiple coils can be automatically assembled simultaneously.

(4) To install the coil, the coil fitting part and the column are integrally provided on the member, so after fitting and fixing the coil, you can assemble it by fixing both ends of the column to the frame and the yoke or printed circuit board. is completed.

Therefore, the assembly work becomes easier, the assembly accuracy is significantly improved, and the number of parts can be reduced.

[Brief explanation of drawings]

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. 5 is a perspective view showing an embodiment of the member for installing the coil according to the present invention, FIG. 6 is a plan view of the main part showing how the coil is installed, and FIGS. FIG. 3 is a cross-sectional side view of the motor in an attached state. In addition, in the symbols used in the drawings, 8...
・Coil, 15... Coil mounting member, 16...
...Coil fitting part.

Claims (1)

[Scope of utility model registration request] A rotor having a ring-shaped magnet, a frame body rotatably supporting a rotating shaft of the rotor, a plurality of coils arranged to face the magnet, and these coils arranged to form the magnet. In a flat brushless motor, each of the flat brushless motors is provided with a yoke magnetically coupled to a yoke or a printed circuit board to which these coils are connected, a plurality of fitting portions into which each of the coils is fitted, and a plurality of fitting portions protruding in the axial direction. To attach a ring-shaped coil made of synthetic resin that is integrally provided with several pillars, a member is provided to fix each coil to each fitting part, and one end of each pillar to the frame. A flat brushless morph characterized in that the other end of the waist is fixed to the yoke or the printed circuit board.