JPS6149903B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a rotor for a flat motor.

Conventionally, the rotor of a commonly used motor has a thickness t obtained by winding a coil wire so that the number of turns N required for the motor winding specification is obtained, as shown in Fig. 8 A to C. One segment coil C is finished, and the three segment coils C ₁ to _{C 3} configured in this way are placed on a rotor molding die and molded to have the same thickness as the one segment coil. Each segment coil constituting the rotor and the commutator 2' are fixed to each other by means of an adhesive or an adhesive. However, in such a configuration, for example, three or five
Since the rotor is formed by arranging several segment coils adjacent to each other, the segment coils C ₁ to C ₃ and the commutator 2', etc., are fixed by intervening a molded product e or by adhesion. It is necessary to take measures such as the following, which has the drawback of complicating the manufacturing process and increasing costs.

Fig. 9 shows a rotor of a flat motor equipped with so-called self-fused coils, in which five 1-segment coils each consisting of coil windings N are arranged at an angle of 360/number of segments so that a portion of each coil overlaps with each other. In this case, the segment coils C ₁ to _{C 5} are fixed to each other by the adhesive strength of each segment coil C 1 to C 5 . A cylindrical commutator 2' press-fitted onto the rotor shaft 3' is placed on top of these coils.
On the other hand, a non-metallic washer 4' is arranged on the opposite side from the cylindrical commutator 2', and between this non-metallic washer 4' and each overlapping one-segment coil ring _C1 to _C5 . The above-mentioned coil wire constituting the rotor is manufactured by applying a method such as newly applying adhesive to the rotor.
_C1 to _C5 are fixed.

However, in the conventional rotor configured as described above, it is necessary to reapply adhesive as described above to secure the coil wires to each other, which reduces assembly man-hours. This method has disadvantages in that it tends to increase costs due to the increased cost and the need for assembly parts such as adhesives.

The present invention improves the above-mentioned drawbacks by dividing one segment of self-fused coil into two layers and arranging them in upper and lower stages.In this case, by shifting the arrangement angle of the upper and lower coils by a certain angle θ, Segment coils are stacked on top of each other and the adhesive strength of the self-fused wires in these parts is used to construct the rotor coil, which reduces the cost of the motor and also improves efficiency. The purpose is to provide children.

The present invention will be described below with reference to the drawings. Figures 1 to 6 show embodiments of the present invention, and the rotor coil in the present invention has a coil thickness corresponding to the number of turns N of a conventional one segment coil, which is half of the coil thickness of 1/2N turns each. It is divided into wire rings 1a and 1b and formed in two layers, one above the other. For example, in a rotor having a three-segment coil, the coil pitch is 360/number of segments, which is 120 degrees apart to form a coil ring. Further, the segment coil wire 1b for 1/2N turn in the lower stage is formed in the same manner as the coil wire 1a in the upper stage, and the upper coil wire is also formed to have the same shape and size as the lower coil wire. ing. When the rotor is viewed from the side of the cylindrical commutator 2 , which is formed into a substantially cylindrical shape, the center line of the upper coil ring 1a is approximately at a mechanical angle θ with respect to the center line of the lower coil ring 1b. They are arranged so as to be offset by 25° to 35° in the clockwise direction. As shown in Fig. 3, the upper and lower coil rings are defined by the coil winding start line a1 of the upper coil ring _1a and the coil winding end line _b2 of the lower coil ring 1b. Electrically connected upper and lower coil wire rings 1a and 1b
The coil wires are wound in the same winding direction. The 1-segment coil wire connected in this way is as shown in FIG. 2, the lower coil wire 1b.
The winding start wire b ₁ and the winding end wire of the upper coil wire 1a
a ₂ comes out as a segment terminal. Other segment coils are constructed in this way, and in the present invention, as shown in FIG.
Three segment coils consisting of coil wires 1a and 1b, 1a' and 1b', 1a'' and 1b'' are arranged around the rotor 2 , and the rotor R is constituted. In this case, as mentioned above, the coils stacked one above the other in two stages in each segment have an upper coil ring and a lower coil ring of approximately 120 mm in each adjacent segment.
The segment coils are arranged around the rotor shaft 3 so as to have a mechanical angle of .degree., and so that the outer diameter of each segment coil is equal to the outer diameter of the rotor R. Then, when the upper and lower coil rings are overlapped next to each other, the alcohol system that dissolves the fusion layer of the self-fusion wire applies heat, etc., and each segment coil is integrally bonded and fixed to each other through a process such as pressure pressing. It is something that will be done. Further, the winding start wire b ₁ and the winding end wire a ₂ which came out from the coil terminal of one segment earlier are twisted wires and electrically connected, and are respectively connected to the commutator segments.

As shown in FIG. 4, the lower coil rings 1b to 1b'' of the coils of each segment arranged in this way have the same thickness as the upper coil rings 1a to 1a'' when viewed from the upper coil surface. The part that is only 1/2t thicker than the total thickness t of the rotor R is the part b of the rotor coil.
This occurs at three locations b' and b''. In other words, if the upper and lower coil rings 1a and 1b are stacked to form one segment of coil ring, the inner part will be located at b, b', and b'' in the figure. At the three locations shown, parts equal to the thickness of the lower coil wire ring 1b are created. Then, commutator segment terminals 2 are connected to these parts b to b″.
The structure is such that a, 2b, and 2c are placed on it.

On the other hand, on the opposite side of the cylindrical commutator 2, which is composed of the commutator piece segment terminals 2a to 2c and the commutator surface part 2d and is formed in a substantially cylindrical shape, that is, on the lower side of the lower coil wire ring 1b in the illustrated state, there is a circular A plate-shaped non-metallic washer 4 is provided. This washer 4 is press-fitted into the rotor shaft 3 and fixed, and the lower segment coil 1b is sandwiched and fixed between this washer 4 and each segment terminal 2a to 2c of the cylindrical commutator 2. The rotor R is configured in this way.

Figure 5 shows the upper and lower coil wire rings 1a, 1.
This figure shows the state of connection between the terminals b and the commutator segment terminals 2a to 2c, and the corresponding coil rings 1a and 1b in the upper and lower stages are connected as described above. Adjacent commutator segment terminals 2a, which are insulated from each other via the slit S,
Upper and lower coil wire rings 1 are attached to 2b, respectively.
One ends of a and 1b are connected. In the figure, 1a', 1b' and 1a'', 1b'' are the upper and lower coil rings, respectively, and these pairs of coil rings 1a', 1b' and 1a'', 1b'' form a 1-segment coil. ing.

Next, the flat motor constructed using the present invention was installed in the sixth
Shown in Figures A and B. Permanent magnets 6 and 7 are fixed on the lower magnet mounting yoke 5, and the surfaces of the permanent magnets 6 and 7 are magnetized in N and S so that their surfaces have different polarities, respectively. A flat rotor R configured as described above is disposed above the permanent magnets 6 and 7 so as to face them. The cylindrical commutator 2 of the rotor R is disposed in the gap 8 between the N and S of the permanent magnets 6 and 7, and a brush board 9 is provided in the gap 8 so as to freely move around the sintered bearing 10. The brush terminal 11 is arranged on the brush base plate 9 so as to rotate. A brush (spring brush) 12 is welded and fixed to the brush terminal 11, and a vibration-proof rubber 13 is attached to the brush 12. The cylindrical commutator surface 2d is sandwiched between the brushes, and electricity is supplied thereto.
The magnetic circuit of the permanent magnets 6 and 7 is constituted by an external yoke 14 which also functions as a casing, and is configured to flow magnetic flux in the axial direction.

In this case, as shown in FIG. 7, in the present invention, the size of the permanent magnets 6, 7 of the motor and the size of one segment coil of the rotor coil are formed to be approximately the same. In other words, the rotor is divided into two upper and lower stages with a radius Rc with the rotation center as a reference, and each segment has a coil ring 1a,
If the width of 1b is lc, the radius of the field magnet is based on O.
Form a magnet whose length is Rm and lm. Here, the rotor coils per segment are arranged so that Rc≒Rm and lm≒lc. In this case, the number of rotor coils that can be arranged in this way is 1
The coil per segment is divided into two stages, upper and lower.
This purpose can be achieved by configuring them so that their center angles are shifted by approximately 25° to 35°.

As described above, according to the present invention, one segment coil consists of two upper and lower coil wire rings, and the adhesive force of the self-fusing wire is utilized by utilizing the overlapping portion with each adjacent segment coil. Since the segment coils that make up the rotor are connected to each other using Since it is divided into two layers and stacked and bonded in a staggered manner, it has excellent mechanical strength, and unlike conventional rotors, there is no need to bond and fix the coils with adhesives or molded products, which reduces costs accordingly. can be achieved.

Further, since the one-segment coil is configured to have almost the same size as the permanent magnet, there is an advantage that the characteristics are slightly improved compared to the conventional motor having the structure shown in FIG.

Note that although the above description has been made regarding the case of a rotor having three segment coils, substantially the same effect can be expected even if the present invention is applied to a rotor having five or seven segment coils.

[Brief explanation of the drawing]

Figure 1A is a plan view of the rotor according to the present invention, Figure B is a sectional view taken along the line A-A' of the same, and Figure 2 is a state in which the upper and lower coil rings are overlapped to form a 1-segment coil. FIG. 3 is an explanatory diagram showing the same situation as above, FIG. 4 A is a plan view of the segment coil used in the present invention, FIG. An explanatory diagram showing the connection relationship between each segment coil and a commutator, FIG. 6A is a plan explanatory diagram of a flat motor to which the present invention is applied, FIG. The figures are explanatory diagrams showing the relationship between the segment coils of the present invention and the permanent magnets of the motor. , b are other conventional examples. 1a, 1a', 1a''... Upper coil wire ring, 1b,
1b′, 1b″…lower coil wire ring.

Claims (1)

[Claims] 1. In a rotor having a plurality of segment coils, one segment coil is formed by two coil rings consisting of an upper stage and a lower stage, and the winding start and winding end of the upper and lower stage coil rings are are electrically connected so that the winding directions of the upper and lower coil rings are the same, and the upper and lower coil rings constituting a 1-segment coil are overlapped with mutual deviation, and this deviation is A rotor for a flat motor, characterized in that a deflection section of a coil adjacent to a deflection section is overlapped and joined together. 2. A rotor for a flat motor according to claim 1, wherein the upper and lower coil rings constituting a one-segment coil are arranged offset from each other by approximately 25° to 35° with respect to the axis.