JPH022062Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a small motor, and particularly to a small motor equipped with a rotation control section.

Control circuits for small motors are generally based on a printed circuit board, on which an IC-based control circuit is mounted. In this case, the method of attaching such a printed circuit board to the motor has been viewed as a problem from the viewpoint of durability and the like. Conventional methods for mounting printed circuit boards include wrapping the motor assembly and the printed circuit board in one bracket so that they appear integrated, or mounting the printed circuit board separately from the motor assembly. Many methods include constructing a substrate and connecting the two with lead wires.

However, all of these methods have disadvantages in that the overall size of the device increases and a protective cover is required, which not only increases cost but also lowers productivity.

At the same time, since a method such as connection using the lead wire was used, there was a drawback that assembly was complicated.

The purpose of the present invention is to improve the disadvantages of the above-mentioned prior art, improve productivity, and provide a relatively inexpensive and highly durable compact motor with a built-in rotation control means.

Therefore, the present invention consists of a rotor having a plurality of coils, a field permanent magnet disposed opposite to the rotating surface of the rotor, a first bracket for fixing and supporting the permanent magnet, and a first bracket for fixing and supporting the permanent magnet. a second bracket equipped with a brush disposed outside the first bracket;
A printed circuit board equipped with a rotation control circuit is disposed between each of the second brackets, and a solder ball is interposed between the rotation control circuit and the brush section equipped on the second bracket. Therefore, it is an attempt to achieve the above-mentioned purpose.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In these figures, 1 indicates a flat bottomed cylindrical case which is also the exterior of a small motor, and 2 indicates a rotor. This rotor 2 is made of plastic and is molded into a disk shape. Fan-shaped coils 2A are arranged and equipped at equal intervals at each location. Furthermore, a rotor shaft 3 is inserted into and fixed to the center of the rotor 2, and at the same time, a commutator 4 is fixed to the upper end of the shaft 3 in FIG. This commutator 4 consists of six conductor pieces 4A arranged at equal intervals, and each pair mounted at symmetrical positions is electrically connected to each fan-shaped coil 2A independently of the other two pairs.
Each of the coils 2A, the rotor shaft 3, and the commutator 4 is insert-molded together with the plastic molding of the rotor 2, thereby integrating the constituent members attached to the rotor 2. Durability has been enhanced.

Opposing each coil 2A of this rotor 2,
A permanent magnet 5A formed in an annular shape and fixed to the first bracket 5 is arranged close to the disk surface of the lotus 2. The first bracket 5 is made of a magnetic material, and has three engaging protrusions 5B at its circumferential edge, and is engaged with the notch 1A formed in the flat case 1 at the protrusions 5B. has been done. Further, on the outside of this first bracket 5 (on the upper side in FIG. 2), there is a second bracket 6.
is equipped. This second bracket 6 is
As shown in Fig. 1, there is an insulating sheet 6 on its inner surface.
A brush 7 corresponding to the above-mentioned commutator 4 is fixedly attached via A. Specifically, a pair of metal brush fixing pieces 8, 8 are fixed to the inside of the second bracket 6 with plastic eyelets 9 via the insulating sheet 6A, and the brush fixing pieces 8, 8 are bent. A configuration is adopted in which the brushes 7, 7 are attached to the hanging pieces.
The brush 7 is provided with a spring function at a portion that comes into contact with the commutator 4. Further, a thrust bearing 10 is attached to the center of the second bracket 6, and together with a radial bearing 1B installed at the center of the bottom of the flat case 1, the second bracket 6 rotatably supports the rotor 2. It is becoming. Further, the second bracket 6 is provided with locking protrusions 6B at three locations on its outer peripheral edge, and is thereby fixed to the upper end of the flat case 1 in FIG. ing.

A disk-shaped printed circuit board 11 is provided between each of the first and second brackets, as shown in FIG. A relatively large fan-shaped notch hole 11A is formed in the printed circuit board 11 in order to prevent the brush 7 and the brush fixing piece 8 mentioned above from coming into contact with each other. The printed circuit board 11 also includes a rotation control circuit section 12 that is integrated into an IC for controlling the rotation of the rotor 2 described above.
12 are installed. Then, an electrode pattern 1 for a control circuit including the rotation control circuit portions 12, 12.
2A is formed on the printed circuit board 11,
One end of the electrode pattern 12A is connected to electrode terminals 11B, 11B protruding from the outer periphery of the printed circuit board 11, as shown in FIG. Further, in each electrode terminal 11B, 11B portion of this printed circuit board 11, relatively small holes 11C, 1 are formed through each terminal 11B, 11B and the printed circuit board 11.
1C, 11D, and 11D are formed, respectively.

Reference numerals 13 and 13 indicate solder balls made of a solder material. These solder balls 13, 13 are connected to the holes 11C or 11 of the electrode terminals 11B, 11B described above.
D is formed to be slightly larger than the diameter of D, thereby connecting the small holes 8A, 8A pre-formed in each of the brush fixing pieces 8, 8 and the electrode terminals 11B, 11.
It is interposed between the small holes 11D and 11D portions of B, as shown in FIG. 2, so that electrical continuity can be established between the two.

Next, to explain the assembly procedure of the above embodiment, first, one end of the rotor shaft 3 is pivotally supported by the bearing 1B of the flat case 1, and then the permanent magnet 5 is
The first bracket 5 is disposed within the flat case 1 with A facing toward the rotor 2, and the protrusion 5B on the outer periphery of the bracket 5 is engaged with the flat case 1. Next, the printed circuit board 11 is stacked on the first bracket 5 with the mounting surface of the electric components such as the IC facing upward, and with the electrode terminal 11B portion thereof protruding outside. Therefore, the printed circuit board 11 equipped with the rotation control circuit can be installed in the flat case 1 very easily. Next, a hole 11D provided inside this electrode terminal 11B portion,
11D, and in this state, the second bracket 6 equipped with the brush 7 is attached to the outside of the first bracket 5, thereby connecting the electrode terminal 11B. , 11B and the brush fixing pieces 8, 8 with solder balls 1.
3 and 13 so that they can be electrically connected to each other separately. In this case, the commutator 4 and the brushes 7, 7 are pressed together in an appropriate state, and the other end of the rotor shaft 3 is connected to the flat case 1.
It is adjusted in advance so that it engages with the bearing 1B.

As described above, according to the present invention, there is a rotor having a plurality of coils, a field permanent magnet disposed opposite to the rotating surface of the rotor, and a first magnet that fixes and supports the permanent magnet. Bracket and this first
A small motor has a second bracket equipped with a brush disposed on the outside of the first bracket, and a printed circuit board equipped with a rotation control circuit is disposed between each of the first and second brackets. Since we have adopted a configuration in which a solder ball is interposed between the rotation control circuit and the brush part installed on the second bracket, it can be assembled very easily using almost the same steps as the conventional assembly procedure described above. The rotation control circuit can be housed inside the motor, and the motor containing the rotation control circuit can be made thinner and smaller, and productivity can be improved, and it can also be mechanically reinforced. It is possible to provide a small motor with an internal rotation control circuit, which is unprecedented in that the durability is further improved.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention;
FIG. 2 is a partial sectional view showing the assembled state of FIG. 1. 2... Rotor, 2A... Coil, 5... First bracket, 5A... Permanent magnet, 6... Second bracket, 7... Brush, 11... Printed circuit board, 12... Rotation control circuit.

Claims (1)

[Scope of utility model registration request] A rotor having a plurality of coils, a permanent magnet for a field disposed opposite to the rotation axis of the rotor, a first bracket that fixes and supports the permanent magnet, and a rotor on the outside of the first bracket. A small motor having a second bracket equipped with a brush arranged therein, a printed circuit board equipped with a rotation control circuit is disposed between each of the first and second brackets, and the rotation control circuit and the Second
A small motor characterized by having a solder ball interposed between the brush part installed on the bracket.