JPH0130379B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotor in a DC rotating machine such as a DC motor or a DC generator, and particularly relates to a coil winding mode that suppresses swelling of the coil end portion of the rotor.

In recent years, as the uses of DC rotating machines have diversified, there has been a strong demand for improved installation ease, and reducing the size and weight of rotating machine devices has become an unavoidable issue. In particular, radiator fan drive motors and the like used in front-transport drive vehicles are installed in engine compartments where various parts are crowded and there is little space for installation, so there is a strong desire for a smaller and flatter exterior.

As shown in FIG. 1, a normal DC rotating machine includes a housing H, a magnet M as a stator fixed to the inner surface of the housing H, a rotor R disposed in the center, and a brush device B. It consists of In such a DC rotating machine, the rotor core R
Coil end portion R2 raised on the surface of 1
Since it does not cut the formed magnetic field, it has no relation to the output, and as shown in FIG. 1, the height of the rise occupies a considerable proportion of the axial length of the rotating machine. Therefore, it can be seen that reducing the height of this coil end portion R2 is advantageous for making the rotating machine smaller and flatter.

As shown in FIG. 2, a conventional method for forming coils in a rotor of a DC rotating machine involves forming a large number of winding grooves 2 evenly in one stage around the entire periphery of a rotor core 1.
The conductive wire 3' is inserted into two selected winding grooves with an interval corresponding to the interval between the magnetic poles of the stator and wound around the rotor core 1 to form the coil 3. The above operation is repeated by changing the combination by shifting the winding grooves 2 to be wound one by one without changing the interval between the two winding grooves 2, and the entire large number of coils 3 of the rotor R are completed. There is. Therefore, on top of the coil 3 formed by completing one winding process, several other coils 3 (three in this example) are wound in different combinations of winding grooves 2. As a result, the coil end portion R2 becomes thicker and lowers as shown in FIG. As described above, this raised coil end portion R2 has been an obstacle to shortening the axial length of the upstream rotating machine.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a rotor for a DC rotating machine that is convenient for reducing the external size of the DC rotating machine by suppressing protrusions due to thickening of the coil end portion. purpose. The rotor of the DC rotating machine according to the present invention is characterized by a rotor core in which a large number of winding grooves are formed, a commutator made up of a large number of segments, and a rotor that selectively combines among the large number of winding grooves. A rotor for a DC rotating machine having a plurality of coils formed by winding a conductor in pairs of winding grooves and connecting the conductor to segments of the commutator, wherein the rotor core has at least two coils having different depths. It has multiple winding grooves formed in stages, and a large number of the coils are formed by winding conductive wires in winding grooves that are selectively combined in each stage, and in each segment of the commutator. The coils wound in the winding grooves in the same stage are connected to each other.

Next, specific embodiments of the present invention will be described based on the accompanying drawings. FIG. 3 is a plan view of a rotor of a DC rotating machine formed by distributing coils in two stages according to the present invention. In FIG. 3, a rotor core 1 whose outer shape is approximately a disk shape is attached to a rotating shaft 5.
is formed by laminating an appropriate number of rotor core pieces 1' as shown in FIG. As shown in FIG. 4, this rotor core piece 1' has 13 first winding grooves 2a which have a deeper depth from the circumference connecting the end faces of the rotor core piece 1' to the bottom of the groove, and this depth. A total of 26 winding grooves 2, which are formed in two stages of 13 second winding grooves 2b that are shallower than the first winding grooves, are equally carved around the entire periphery of the disc-shaped rotor core piece. ing. The shapes of these two types of winding grooves 2 are not limited to the shape of this embodiment, as long as the entrance is narrow and the winding is wide at the back.
A center hole 1a through which the rotating shaft 5 is inserted is bored in the center of the rotor core piece 1'. A rotor core 1 composed of rotor core pieces' shaped as described above is mounted on a rotating shaft 5, and a commutator 4 is mounted on the rotating shaft 5 in parallel in close proximity to the rotor core 1.
The commutator 4 has a cylindrical shape, and the same number of segments 4a as the winding grooves 2 formed in the rotor core 1 are evenly fixed to the entire circumferential side surface of the commutator 4. Each segment 4a is provided with a riser portion for locking the conducting wire 3'.

Thus, each stage of the 26 winding grooves 2 formed in two stages on the rotor core 1 is provided with windings that maintain a constant spacing corresponding to the magnetic pole spacing on the stator side. 3
Distributed coils 3 are formed in a second stage as shown in the figure. Also, the coil 3 is segment 4a
The coils 3 are connected to the coils 3 wound in the winding grooves in the same stage at the riser portion 4b. In this case, for each stage, 13
Since a total of 26 coils 3 are formed and distributed in two stages, the limit is that the two coils 3 overlap twice, and there is no place where they overlap more than that. Therefore, compared to the case of the prior art in which the coil is overlapped in four layers, the protrusion of the coil end portion R2 due to the thickening of the coil as shown in FIG. 1 is significantly suppressed.

Next, a method of manufacturing a rotor for a DC rotating machine according to this embodiment will be explained. First, a suitable number of rotor core pieces 1' described above are laminated to form a rotor core 1 having two stages of winding grooves 2. Then, the rotor core 1 and the commutator 4 are press-fitted onto the rotating shaft 5 and attached to the rotating shaft 5 in parallel and close to each other.

Then, the coils 3 distributed in two stages are formed. The winding method will be explained in detail below with reference to a schematic developed view of the rotor in FIG. In Figure 5,
1b represents the respective branch portions that are branched to form 26 winding grooves at the periphery of the rotor core. Each branch portion 1b is numbered in clockwise order for differentiation. A total of 26 branches 1b are also formed. 4a represents segments disposed around the entire side surface of the commutator 4, which are similarly numbered and differentiated in order in the clockwise direction. 4b is a riser section provided in each segment. Here, as shown in FIG. 4, the deep first winding groove 2a extends from the even numbered branches 1b to the odd numbered branches 1
It is formed between b. On the other hand, the shallow second winding groove 2b extends from the odd-numbered branch portions 1b to the even-numbered branch portions 1b.
It is formed between. The deep first winding groove is indicated by a, and the shallow second winding groove is indicated by b. Similarly, the individual winding grooves 2 are grouped together in a clockwise direction and numbered sequentially to distinguish them. Therefore, the second winding groove between the branch part (1) and the branch part (2) is the groove b1, and the first winding groove is the groove b1 between the branch part (2) and the branch part (3).
The winding groove becomes groove a2. Further, the path of the coil formed in the first winding groove 2a is shown by a broken line, and the path of the coil formed in the second winding groove 2b is shown by a solid line.

First, the tip of one continuous conductive wire 3' is locked to the riser part of the segment 4', and the deep first winding groove 2a is
Start winding from the end. From segment 4',
One type of coil 3 is formed along a route that passes through the groove a6, places the groove a8, reaches the groove a10, and returns to the segment 12'. During this time, the winding operation is repeated several times between the grooves a6 and a10, and then returns to the segment 12'. Next, after locking the conductor 3' to the segment 12', the groove a
12 is placed to reach the groove a14, and further a groove a16 is placed to reach the groove 18. After being wound a predetermined number of times between the grooves a14 and a18, as in the previous case, it returns to the segment 20'. The operation of forming the coil 3 according to the above route is repeated several times in the same direction around the rotor core 1, four times in this example, until the continuous conducting wire 3' returns to the starting point segment 4'. The coils are formed by being evenly wound around the 13 first winding grooves 2a in 13 ways. This winding method, in which one coil is formed and then the coils are successively formed by proceeding backwards while maintaining a set constant interval without returning to the previous segments, is the so-called wave winding method. When winding is completed in the first winding groove 2a by the wave winding method, the conducting wire is locked only to the riser portions of even-numbered segments, and one closed circuit is completed. Next, the shallower second winding groove 2
In step (b), winding is performed using a new continuous conductive wire using a wave winding method similar to the method for winding the first winding groove 2a. Using half of the unused odd-numbered segments and odd-numbered second winding grooves, 13 different coils are formed evenly at the same intervals, forming one closed circuit at the same time. .
Generally, a winding method including a plurality of circuits in the entire coil as in this example is called multiple winding, and the number of circuits is called multiplicity.

When winding is performed and coils are formed according to the procedure described above, as shown in FIG. The limit is that two types of coils overlap each other,
The winding thickening phenomenon is eliminated and the protrusion of the coil end is suppressed. After this, the respective riser parts with the conductor wires locked are electrically connected by fusing etc.
Complete the rotor of a DC rotating machine. The rotor manufactured in this manner has two independent circuits formed in each stage in two stages of winding grooves, and is thus provided with double-wave winding. As shown in FIG. 5, for a rotor having such a double-wave winding, the width in the direction in which it makes sliding contact with the segment 4a is approximately 2 times the width of the segment 4a in that direction. A pair of brushes 6 having twice the sliding contact surface are provided, and both circuits are always electrically connected. Incidentally, instead of forming the riser portion 4b, a suitable jig or the like is used to connect the conductive wire 3' to each segment 4a.
It may also be a method of fixing it to the surface of.

As described in detail above, according to the present invention, by dispersing and forming coils in multiple stages, it is possible to obtain a rotor for a DC rotating machine with small protrusions at the coil ends. Therefore, by using this rotor, the axial length of the DC rotating machine can be shortened, and the external shape can be made smaller and flatter. Furthermore, the internal space of the DC rotating machine is free, and other parts, especially brushes, etc., can be made longer, resulting in a DC rotating machine with a long life. Furthermore, the absolute length of the conductor wire at the coil end, which is unrelated to the output, can be shortened by forming the coil end in the deep winding groove, so the weight can be reduced accordingly and the cost can also be reduced. It goes without saying that the present invention should not be limited to the above-described specific embodiments, but can be modified in various ways. For example, a plurality of conductive wires may be bundled, and the coil winding method for forming independent circuits in each stage may be multiple winding, recurrent multiple winding, or recurrent wave winding. In addition, the number of stages of the winding groove may be formed in multiple stages within the range allowed by the size of the rotor core, and when the number of stages is s and the multiplicity is m, m≧ks (k is a natural number, m, s is a natural number greater than or equal to 2). However, if m=ks, the winding method in each stage can be made the same, which is advantageous in terms of equipment and man-hours. Here, it is assumed that the degree of regression of the regression winding is equal to the degree of multiplicity.

[Brief explanation of drawings]

Figure 1 is a schematic sectional view of a conventional DC rotating machine, Figure 2 is a plan view of the rotor of a conventional DC rotating machine, and Figure 3 is a schematic cross-sectional view of a conventional DC rotating machine.
The figure is a plan view showing one embodiment of a rotor for a DC rotating machine according to the present invention, FIG. 4 is a plan view of a rotor core piece used in the first embodiment, and FIG. 5 is a winding method of the first embodiment. FIG. 3 is a schematic developed view of a rotor. (Explanation of symbols), 1: Rotor core, 2, 2a,
2b: Winding groove, 3: Coil, 4: Commutator,
4a: segment, 4b: riser section.

Claims (1)

[Claims] 1. A rotor core in which a large number of winding grooves are formed, a commutator made up of a large number of segments,
Rotation of a DC rotating machine having a large number of coils formed by winding a conductive wire around a selectively combined pair of winding grooves among the plurality of winding grooves and connecting the conductive wire to a segment of the commutator. In the child, the rotor core has at least two different depths.
It has multiple winding grooves formed in stages, and a large number of the coils are formed by winding conductive wires in winding grooves that are selectively combined in each stage, and in each segment of the commutator. A rotor for a DC rotating machine, characterized in that the coils wound in the same winding grooves are connected to each other.