JPS6256748B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coreless armature used in a so-called coreless motor.

Conventionally, as shown in FIG. 1a, a bundle of sheet-like coated conductive wires 1, which are bundled parallel to each other at equal pitches so as not to overlap each other, is spirally wound to form a cylindrical inner layer coil 2. coil 2
As shown in FIG. 1b from above, the sheet-like covered conductor wire bundle 1 is spirally wound in the opposite direction to form an outer layer coil 3, and both the inner and outer layer coils 2 and 3 are wound as shown in FIG. A coreless armature is provided in which the coil wires 5 and 6 of both coils 2 and 3 are simultaneously cut at regular intervals L and welded to each other at the end face 4 of the cut portions as shown in FIG. being developed.
FIG. 4a shows the connection state of the inner layer coil wire 5 and the outer layer coil wire 6 of such a coreless armature, and as shown in the figure, the closed loop consisting of the coil wires 5 and 6 is the inner layer coil wire. Starting from the conductor end, it reaches the lower coil conductor end, and is connected to the outer layer coil conductor end ′, as follows ′, , ′, ′,
,,' are successively connected, and finally return to the original end of the coil conductor to form a closed loop. Figure 4b shows the coil wires 5 and 6.
As shown in the same figure, the positions of the coil wires 5 and 6 are shifted by about 180° from one cut end face 4 to the other cut part end face 4. Therefore, the positions of the coil wires 5, 6 are shifted by about 360 degrees during one reciprocation in the axial direction. In this way, the winding direction of each coil wire 5, 6 is greatly inclined with respect to the coil axis direction, so that the coil wires 5, 6 straddle both sides of the N pole and S pole of the field. When such a coreless motor exists, the electromagnetic forces generated in the coil wires 5 and 6 cancel each other out, resulting in a problem that the efficiency of the coreless motor decreases.

The present invention was made to solve these problems of the conventional example, and by making the winding direction of the coil wire approximately parallel to the axial direction of the coil,
The object of the present invention is to provide a ironless core type armature that achieves high efficiency.

The configuration of the present invention will be described below with reference to illustrated embodiments. 5a and 5b show the basic idea of the present invention. As shown in FIG. 5a, the outer layer coil wire 6 is connected to one end of the auxiliary wire 7 at the cut end surface 4, The other end of 7 is at an angle θ ₀ in the circumferential direction
The inner layer coil wire 5 is connected to the inner layer coil wire 5 at a position shifted by the same amount. FIG. 5b shows its developed view, and as shown in the figure, each coil wire 5, 6 is wound so as to be approximately parallel to the axial direction. In order to reduce the angle α that each coil wire 5, 6 makes with the axial direction of the coil, when winding the inner layer and outer layer coils 2, 3 as shown in FIG. It is wound so that β (=2π−α) becomes large. 6 to 8 show specific connection structures between the inner layer coil wire 5 and the outer layer coil wire 6. First, FIG. 6 a to d show a plurality of auxiliary connections with different heights H. The inner layer coil wire 5 and the outer layer coil wire 6 are connected using the plates 8 ₁ to 8 ₉ . The auxiliary connection plate 8 is made of a conductive metal plate, and is an upstanding member extending downward from both ends of the arc-shaped piece 9 along the shape of the cut end face 4 of both the inner and outer coils 2 and 3. piece 10 and an inwardly protruding piece 11 that protrudes radially inwardly and outwardly from the lower end of the upright piece 10, respectively.
and an outwardly protruding piece 12. The height H of the upright piece 10 is different for each of the auxiliary connection plates 8 ₁ to _{8 9} , and the height H of the upright piece 10 of the auxiliary connection plate 8 ₁ is the largest, and the following auxiliary connection plates 8 ₂ , 8 ₃ , The height H of the upright piece 10 is configured to decrease in the order of...8 to ₉ . Figures 6b and 6c show an arrangement in which the inner layer coil wire 5 and the outer layer coil wire 6 are connected to each other using each of the auxiliary connection plates ₈₁ to ₈₉ , and as shown in the figure, the upright pieces The auxiliary connection plates 8 _{to 9} with the smallest height H of 10 are arranged at the bottom layer, and the following auxiliary connection plates 8 ₈ , 8 ₇ , 8 ₆ ,...8
₁ by shifting them one pitch at a time and placing the standing pieces 1
The auxiliary connection plate ₈₁ having the largest height H at zero is arranged on the top layer. The inwardly protruding pieces 11 and outwardly protruding pieces 12 of each of the auxiliary connection plates 8 ₁ to 8 ₉ are irradiated with a laser beam from above to weld to the inner coil wire 5 and the outer coil wire 6. This is something that is increasingly being done.

Next, FIGS. 7a and 7b show another embodiment in which the cut end surface 4a of the inner layer coil 2 is lower than the cut end surface 4b of the outer layer coil 3 to provide a stepped portion 13. Auxiliary connection plates 14 are sequentially arranged on 13 to connect the inner layer and outer layer coil wires 5 and 6. Auxiliary connection plate 14
is formed of a conductive metal plate, and is connected to the inner layer coil wire 5.
5, an outer connection piece 16 connected to the outer layer coil wire 6, and a connection piece 17 that connects each connection piece 15, 16 to each other. When connecting the inner layer coil wire 5 and the outer layer coil wire 6, first, as shown in FIG. Welding is performed by bringing the end face 4a into contact and irradiating the laser beam from above. Next, connect the connecting piece 17 of the auxiliary connecting plate 14 in Fig. 7a.
The outer connecting piece 16 is brought into contact with the cut end surface 4b of the outer layer coil wire 6, and welding is performed by irradiating the laser beam from above to connect both the inner and outer layer coil wires. This completes connections 5 and 6. In addition, in Figure 7, 1
8 is a commutator plate, on which commutator segments 19 are attached at equal angular intervals in the circumferential direction, and commutator segments 19 are provided with commutator segments 19 extending radially inward from the inner connecting piece 15 of the auxiliary connecting plate 14. The inwardly extending pieces 20 that have come out are electrically connected.

Next, FIG. 8 shows still another embodiment of the present invention, in which the radially inner side of the inner layer coil wire 5 and the radially outer side of the outer layer coil wire 6 are cut off at the cut end face 4. The inner step part 21 and the outer step part 22 are formed, and the inner auxiliary connecting material 2
The long arm part 23a of 3 is connected to the upper part of the outer step part 22, and the short arm part 23b is connected to the lower part of the pot side step part 21.
The long arm part 24a of is connected to the upper part of the inner step part 21, and the short arm part (not shown) is connected to the outer step part 22.
It is designed to be connected to the lower part of the. In this way, the inner auxiliary connecting material 23 and the outer auxiliary connecting material 24
If the auxiliary connecting members 23 and 24 are connected alternately every other pitch, the distance between the auxiliary connecting members 23 and 24 can be increased, so that the adjacent auxiliary connecting members 23,
This can prevent a short circuit from occurring between 24.

Further, FIG. 9 shows a cross-sectional view when the iron core type armature is mounted on a coreless motor, and as shown in the figure, one bottom surface 26 of the cylindrical motor case 25
A hollow cylindrical permanent magnet 28 is attached to the outer circumferential surface of the hollow cylindrical boss 27 which is provided to protrude further. A rotating shaft 30 of the motor is supported by a bearing 29 disposed on the inner circumferential surface of the boss 27 . One end of the rotating shaft 30 projects outward from the motor case 25,
A commutator disk 18 is fixed to the other end of the rotating shaft 30, and the coils 2 and 3 of the ironless core type armature are mounted on the commutator disk 18. Commutator segment 19 affixed to the surface of commutator section plate 18
A brush 31 is slidably in contact with the motor bracket 32, and the brush 31 is connected to a terminal 33 implanted in the motor bracket 32.

The present invention is constructed as described above, and the coil wires constituting each of the inner and outer layer coils are aligned with the central axis of the coil between the cut end face of one of the inner and outer coils and the cut end face of the other. The twist angle is made sufficiently smaller than the angle obtained by dividing 360 degrees by the number of magnetic poles of the field, and the inner layer coil wire and outer layer coil wire are separated by a certain angle from the center axis of the coil at the cut end face. An auxiliary connecting member is provided to connect the coils to each other so that a closed loop is formed as a whole for both the inner and outer coils, so the angle at which each coil wire is twisted relative to the axial direction of the coil can be reduced. Therefore, the chances of the coil wire straddling the N and S poles of the field are reduced, and it is possible to prevent a drop in efficiency due to cancellation of electromagnetic forces, resulting in high efficiency. It has the advantage of being able to realize a iron-free core type armature, and furthermore, both the inner and outer coils can be formed by spirally winding a sheet-shaped conducting wire bundle in opposite directions. Therefore, it has the advantage of being easy to produce.

[Brief explanation of the drawing]

1a, b and 2 are perspective views showing the manufacturing process of a conventional ironless core type armature; FIG. 3 is a front view showing a part of the cut end face of the conventional ironless core type armature; FIG. 4a is a diagram showing the connection structure of a conventional iron-core armature, FIG. 4b is an exploded view of the same, and FIG. A front view showing a part of the end surface, FIG. FIG. 7 d is a perspective view of an auxiliary connection plate used in the above, FIGS. 7 a and b are perspective views of main parts of still another embodiment of the same, and FIG. 8 is a still another embodiment of the same. FIG. 9 is a sectional view of a coreless motor having a coreless armature. 1 is a coated conductor wire bundle, 2 is an inner layer coil, 3 is an outer layer coil, 4 is a cut end face, 5 and 6 are coil wires, 7
is an auxiliary line, and 8 ₁ to _{8 9} are auxiliary connection plates.

Claims (1)

[Claims] 1. A cylindrical inner layer coil is formed by spirally winding a bundle of sheet-like conductive wires bundled in parallel at equal pitches so as not to overlap each other at a predetermined twist angle, and the sheet-like conductor wires are wound from above the inner layer coil. The bundle is spirally wound in opposite directions at the same twist angle to form an outer layer coil, and both the inner and outer coils are cut at regular intervals, from the end face of one cut part to the end face of the other cut part. Between the inner and outer layers, the angle at which the coil wires constituting each coil are twisted with respect to the center axis of the coil is made sufficiently smaller than the angle obtained by dividing 360 degrees by the number of magnetic poles of the field, and the center of the coil is An ironless core type characterized in that an auxiliary connecting member is provided to connect the inner layer coil wire and the outer layer coil wire that are separated from each other at a certain angle with respect to the axis, so that both the inner layer and the outer layer coils form a closed loop as a whole. Armature.