JPS6138388Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a thin motor with a simplified configuration and reduced cost. A conventional thin motor using a cylindrical commutator is mainly constructed as shown in FIGS. 1 to 3. That is, a sintered bearing 2' is press-fitted into the center of a thin plate-shaped magnet mounting yoke 1', and a pair of semicircular permanent magnets 3 are installed in the inner space of this magnet mounting yoke 1'. ′ is accommodated. The outer diameter of the pair of semicircular magnets 3' is smaller than that of the motor yoke 4', and a gap 5' is formed between the inner circumference of the motor yoke 4' and the outer circumference of the permanent magnet 3'. It is provided. The structure of a conventional brush block for a cylindrical commutator is shown in detail in FIG. A brush attachment terminal 7' is formed in the ring-shaped brush holding portion 6', and a pair of brush springs 8' are arranged symmetrically along the center line of the ring-shaped brush block. This ring-shaped brush holder 6' is housed in a gap 5' formed between the motor yoke 4' and the outer diameter of the magnet 3', and the brush holder 6' is housed in the motor yoke 4'. It is sandwiched between the motor yoke 4' and the magnet mounting yoke 1' with an insulator interposed therebetween. However, if the brush holding part 6' is made into a ring shape and placed on the outer peripheral side of the permanent magnet 3' as described above, the outer diameter of the permanent magnet 3' is made smaller than the inner diameter of the motor yoke 4', and the gap 5' is need to be formed. This is based on the outer diameter of the motor.
This includes the drawback that the outer shaft radius is large, that is, the portion where the torque is large must be made smaller in size. Furthermore, in order to reduce the thickness of the ring-shaped brush holder in the radial direction, the thickness of the brush holder must be made extremely thin, resulting in the disadvantage that it is difficult to manufacture. The present invention improves the above-mentioned drawbacks by configuring the part that adjusts the motor current angle, which is determined by the positions of the permanent magnets and brushes arranged in the stator, to also function as the motor mounting hole. The object of the present invention is to provide a thin motor with a simplified motor configuration and cost reduction. Embodiments of the present invention will be described below with reference to the drawings. Figures 4A and 4B show a plan view and a sectional view of a yoke applied to a thin motor according to the present invention. The motor yoke 1 has a sintered oil-impregnated bearing 2 having a hole 3 in the center.
is press-fitted and fixed. The side surfaces of the motor yoke 1 are formed with stepped portions 4 and 5, and a brush holding plate, which will be described later, is abutted and fixed to the stepped portion 4 formed approximately in the center of the inner circumferential surface. A stepped portion 5 formed in the opening serves as a fitting portion for a magnet attachment yoke to be attached to the opening of the yoke 1.
After fitting the magnet mounting yoke into the stepped part 5,
It is caulked or welded. Further, a hole 1a is formed in the side surface of the motor yoke 1 for drawing out a lead wire of a brush block, which will be described later. 5A and 5B show the rotor R of the present invention. The rotor R is mainly constructed by winding a plurality of self-fusion coils 7 around a cylindrical commutator 6 in multiple layers, and the rotor R is composed of the motor yoke described above. 1. That is, the cylindrical commutator 6 constituting the rotor R has a shaft mounting hole in the center, into which the rotor shaft 8 is press-fitted and fixed. Further, in the cylindrical commutator 6, the commutator surface 9 is divided into three poles by a slit, and a terminal 10 for connection from a part of the commutator surface 9 to the commutator 6 portion of the self-fusion wire coil 7 is connected to three poles. It stands out. The self-fusing coil 7 and commutator 6 are integrally fixed with resin and adhesive, thus forming the rotor R, and washers 12 and 13 are attached to the commutator 6 in the axial direction. In this case, washers 1
2 and 13 both come into contact with the thrust surface of the sintered bearing 2. Note that the rotor R middle 14 is a gap in the self-fusion coil 7 or an iron piece insertion part. The brush block of the present invention is shown in FIGS. 6, 7A and 7B, and 8A and 8B. Of these, FIG. 6 shows the relationship between the mounting positions of the permanent magnet 15 and the sintered bearing 17 in the brush block.For convenience of explanation, we will first explain from FIG. Permanent magnets 15a, 15a
It is housed in a thin plate-shaped magnet mounting yoke 16. A sintered bearing 17 is press-fitted into the center of the magnet mounting yoke 16. A gap 18 having the same height as the thickness of the magnet 15 is formed between the two permanent magnets 15a, 15a.
8 and a brush block 19 is arranged therein. The above structure will be explained in more detail along FIGS. 7 and 8 A and B. Reference numeral 20a is a brush plate having a brush spring portion 20, and this brush spring portion 20 is connected to the brush terminal 21.
The brush terminal 21 is formed by integrally bending the brush terminal 21.
is the press-fit terminal 22 and the slit groove 2 of the brush holding terminal part 23 using a single insulating sheet if necessary.
4 is press-fitted and fixed. The brush holding plate 25 has brush holding terminal portions 23 at both ends, and this brush holding plate 2
Reference numeral 5 denotes a bearing relief portion 26' of the holding piece 26 made of an insulating material by forming the central portion of the holding piece 26 into an arc shape, and these parts are integrally formed. The upper surface of the holding piece 26 is covered with a conductive part 27 made of copper or the like, and the ends of the brush holding terminal part 23 are connected to the conductive part 2
They are joined by 7. The brush terminal 21 is press-fitted into the slit groove 24 of the brush holding terminal portion 24, and at this time, it is fixed together with the press-fit terminal 22. However,
The brush terminal 21 provided at one end and the conductive surface on the brush holding plate 25 are electrically connected by soldering or the like, and the brush terminal 21 provided at the other end
The electrical terminals of the brushes are taken out in the same direction by lead wires 28, respectively. Here, the brush holding plate 25 may be constructed by punching a single copper laminated plate as shown in FIGS. It is also possible to use one in which the brush holding piece 23 is thicker than the brush holding piece 26 and has a three-dimensional structure. In the embodiment shown in FIG. 9, the base of the brush plate 20a,
That is, the brush terminals 21 at the ends are formed into a substantially U-shape and are configured to fit into the brush holding terminal portions 23 integrally formed at both ends of the brush holding plate 25 so as to extend perpendicularly to the length direction of the brush holding plate 25. has been done. A conductive portion 27 is formed on one side, that is, the top surface, of the brush holding plate 25, as in the embodiment shown in FIG. 8, and this conductive portion 27 is also formed over the top surface and one side surface of the brush holding terminal portion 23. ing. Therefore, when the base of the brush plate 20a is fitted and pressed into the brush holding terminal parts 23 at both ends of the brush holding plate 25, the conductive parts 27
and the brush plate 20a are electrically connected. Note that the shape of the brush holding piece 26 is similar to that of the permanent magnet 15.
Although there is a restriction that the bearing relief part 26' of the sintered bearing 17 of the brush holding piece 26 is accommodated in the cavity 18 between the brush holding piece 26 and the brush holding piece 26, the bearing escape part 26' of the sintered bearing 17 of the brush holding piece 26 may have an arc shape. Any polygonal shape as shown is also conceivable. The brush block 19 constructed as described above is arranged in the hollow space inside the yoke consisting of the motor yoke 1 and the magnet mounting yoke 16 . In order to install the brush springs 20 of the pair of brush plates 20a facing each other from the brush holding terminals 23 at both ends, as shown in FIGS. It is mounted so as to be positioned on the sintered bearings 2 and 17 that are press-fitted into the center of the magnet mounting yoke 16 and the motor yoke 1. That is, the brush block 19 is arranged near the center along the diameter direction of the yoke, and a stepped portion 4 is formed in the depth direction of the motor yoke 1 where the brush holding terminal portion 23 is located. The brush holding terminal portion 23 is inserted into the portion 4 to support the brush holding plate 25, and the brush block 19 is housed and fixed within the motor yoke 1. Brush block 19
The motor is positioned in the thickness direction by the stepped portion 4 of the motor yoke 1, and then the magnet mounting yoke 16 is inserted into the yoke stepped portion 5, so that the magnet mounting yoke 16 pushes the motor from above. The brush holding terminal 23 is completely fixed. The lead wire 28 of the brush block 19 is led out through the hole 1a of the yoke 1. Once the brush holding plate 25 is completely fixed in the yoke as described above, the commutation angle of the motor, which is determined by the positions of the permanent magnet 15 and the brush, can be adjusted by moving the permanent magnet 15. To adjust the rectification angle, as shown in FIGS. 12A and 12B and FIG. After assembly, the magnet mounting yoke 16 is rotated in the direction of the arrow to adjust the rectification angle. Note that the electrical angle adjustment hole 16a is
It can also be used to machine screws inside and fix the motor with screws. As described above, according to the present invention, a brush holding plate and a brush plate are arranged in the inner space of the yoke, which is made up of a motor yoke and a magnet mounting yoke attached to the opening of the yoke, and are in contact with the commutator surface. A brush block having a brush is arranged, and in this case, the brush block is arranged and fixed near the center along the diametrical direction on the motor yoke side, and is divided into two parts, and is arranged opposite to each other on the magnet mounting yoke through a gap. Since the structure is such that the permanent magnets are positioned within the gap between the pair of arranged permanent magnets, the positions of the permanent magnets and the brush can be easily adjusted by rotating the magnet mounting yoke with such a simple structure. Relationships can be adjusted and costs can be reduced. Also, since a stepped part is formed on the motor yoke,
This has the effect of facilitating positioning when assembling the brush block, thereby facilitating assembly.

[Brief explanation of drawings]

Figure 1 is a sectional view of a conventional thin motor, Figure 2 is a conventional brush block for a cylindrical commutator, Figure A is a top view of the ring-shaped brush holder, Figure B is its back view, and Figure 3 is a top view of the ring-shaped brush holder. Figures A and B are explanatory diagrams showing the relationship between the yoke and the permanent magnet, Figures 4 to 13 show the thin motor of the present invention, Figure 4 A is a plan view of the yoke, and Figure B is Figure A-A. Figure 5A is a plan view of the rotor, Figure B is a cross-sectional view taken along line B-B' in Figure 6.
The figure is an explanatory diagram showing the mounting positional relationship between the permanent magnet and the sintered bearing of the brush block, Figure 7A is a plan view of the brush block, Figure B is a side view, and Figure 8A is an assembled perspective view of the brush block. Fig. 9 shows an embodiment of a different aspect of the brush block, Fig. 9 shows an assembled perspective view of the brush block, Fig. 9 shows an exploded perspective view,
Fig. 10 is an embodiment of a further different aspect of the brush block, Fig. 11a is a plan view showing the state in which the brush block is attached to the motor yoke, and Fig. 11a is a plan view showing the brush block attached to the motor yoke.
12A is a plan view showing the state in which the permanent magnet is attached to the magnet mounting yoke, Figure 12A is a sectional view taken along line D-D' in Figure 1, and Figure 13 is a sectional view of the thin motor according to the present invention. A cross-sectional view showing the adjustment state of the rectification angle. 1...Motor yoke, 15...Permanent magnet, 16
... Yoke for magnet attachment, 16a ... Hole for rotation adjustment, 19 ... Brush block.

Claims (1)

[Scope of utility model registration request] A pair of permanent magnets 15 in the inner cavity of the yoke consisting of a motor yoke 1 and a magnet mounting yoke 16.
A brush block 19 is placed in the gap 18 between a and 15a.
In the motor provided with the brush block 19
This is a brush holding plate 2 in which brush holding terminal parts 23 are formed at both ends and a bearing relief part is formed in the center part.
5, a brush plate having a pair of brush spring parts 20 and brush terminals 21 attached to this brush holding plate 25, and a stepped part 4 is formed on the inner peripheral part of the motor yoke 1. The brush block 19 is disposed in the inner space of the motor yoke 1, which has an opening in which the brush holding terminal part 23 is positioned and supported via the stepped part 4 and accommodates the rotor R.
The permanent magnet 15 is placed in the opening of the motor yoke 1.
A magnet mounting yoke 16 having magnets a and 15a is rotatably disposed, and the magnet mounting yoke 16 is rotated relative to a brush fixed to the motor yoke 1 side, and the brush and permanent magnets 15a and 15a are rotated. A thin motor that is characterized by its ability to adjust the position between the two.