JPS5915243Y2 - DC rotating electric machine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a small DC rotating electrical machine with an improved rotor.

Generally, a small DC rotating electric machine is composed of a rotor having an armature winding wound around an iron core having three or more poles, and a stator made of a ring-shaped permanent magnet surrounding the rotor.

Although this type of small-sized DC rotating electric machine can be manufactured relatively easily, it has the disadvantage that rotational unevenness occurs during low-speed rotation.

In order to solve these drawbacks, we developed a slotless armature core with a circular outer circumferential surface, and a slotless armature core with a circular outer circumferential surface.
A small-sized DC rotating electrical machine equipped with a rotor including an armature winding wound so as to be distributed over the windings is disclosed in Japanese Utility Model Application Laid-open No. 52-151317.

In this way, this type of rotor includes a slotless armature core with a circular outer circumferential surface and armature windings wound approximately evenly on the outer circumferential surface of the armature core, Small DC rotating electric machines have characteristics similar to those of ironless rotating electric machines, and although they have slightly more iron loss than ironless rotating electric machines, they have effects such as no cocking, good rectification conditions, and less electrical noise.

If the structure further reduces the moment of inertia, the performance will even approach that of ironless rotating electric machines, and the diameter d and length l
In terms of the winding body size, this method has a coil area of dxl, which is extremely advantageous compared to the various windings of conventional ironless rotating electric machines, and it is cheaper and allows the application of a-Fe magnets. It has the following advantages.

However, this type of small direct current is equipped with a rotor consisting of a slotless armature core with a circular outer circumferential surface and armature windings wound approximately evenly on the outer circumferential surface of the armature core. As shown in FIG. 18', the windings of rotating electric machines have a large weight, and the windings in this area are often damaged during axial shaping.

In order to solve this problem, the amount of coils for one segment is reduced to S as shown in Figure 2.

For example, Japanese Patent Publication No. 57-1928 proposed a method of dividing each group into a plurality of groups and applying radial traverse to each group.
This type of method has already been proposed in Publication No. 6, etc., as shown in Fig. 3, in order to avoid the central protrusion of the shaft fixing part, and to
.

Not only does the angle of inclination between the coil side and the axis become smaller in relation to the traverse width, but also the axial dimension becomes larger due to the overlap at both end connections.

However, in the windings of a rotating electric machine, it is known that the actual width of the windings lined up with respect to -S becomes more advantageous as the angle θ becomes larger (parallel to the axial direction).

In view of the problems of the conventional DC rotating electrical machine, the present invention aims to suppress the increase in the axial dimension due to overlapping of the windings on the axial end face of the armature as shown in FIGS. 1 and 2. We propose the structure of a rotating electrical machine, especially an armature.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a small DC rotating electric machine according to the present invention will be described in detail below with reference to the drawings.

FIG. 4 is an axial cross-sectional view of a small DC rotating electrical machine according to the present invention, and FIG. 5 is a cross-sectional view taken along the line -■ in FIG.

In FIGS. 4 and 5, 1 is a drag cup-shaped rotating electric machine case body, and 2 is a bearing fixed to the bottom central opening of the case body 1. In FIGS.

3 is a rear lid case that is fitted into the opening of the case body 1;
A bearing 4 is fixedly installed in the center opening at the bottom of the rear lid case 3.

5□, 5□ are curved field permanent magnets fixed to the inner circumferential wall of the case body 1 with adhesive, respectively, and the permanent magnets 5,
and 5□ are arranged with a phase shift of approximately 180°.

5 is an output shaft of a rotor rotatably supported by bearings 2 and 4.

3 is a smooth laminated core formed by laminating a plurality of ring-shaped core plates.

This core plate is made of, for example, a silicon steel plate.

6□ is the first core support fixed on the output shaft 5;
Reference numeral 2 denotes a second core support body fixed on the output shaft 5, and the first and second core supports 6□, 6□ fix and hold the laminated core 3 on the output shaft 5. The first and second core supports 6□ and 6□, which constitute the support body 6, are integrally molded from a synthetic resin material.

The first core support 6 and the second lock support 6□ are core support portions 6a, 62a and spacer portions 6□b, 6.
□b and an axial regulating portion 6□C96□C, and a core support portion 6□a.

Connecting portions 6□d, 6□ connecting the 62a spacer parts 6□b, 6□b and the axial regulating portion 6□C962C
d is recessed inward.

Then, on the output shaft 5, the core support portions 6, a and 6□
After arranging the laminated iron core 3 between a, the spacer part 6,
The first core support 6 and the second core support 6□ are fixed on the output shaft 5 so that b and 62b are in surface contact, and the laminated core 3 is held by the core support 6. are doing.

After the laminated core 3 is fixed to the core support 6 in this way and the laminated core 3 is covered with an insulating material 7 as shown in FIG. An effective conducting wire portion 8a is formed at a predetermined angle on the circumferential surface of the
An end connection part 8b is formed at the end as shown in the first figure, and the wire is wound sequentially on the armature core a predetermined number of times so as to have a rectangular shape and shifted by approximately the diameter of the conductor.

A method for winding the armature winding 8 in this manner is already known, for example, in Japanese Patent Publication No. 19286/1986.

After winding the armature winding 8 wound on the armature core in this manner, the end connection portions of the armature winding 8 are connected to the connection portions 6□d and 6□d of the core support 6, respectively. This has the effect of reducing the axial width of the rotating armature winding as much as possible.

1o is a cylindrical commutator fixed on the output shaft 5, and 9
is a spark-quenching element plate fixed on the regulating part 6, c of the first core support 6□, and the lead wire of the armature winding and the commutator 10 are connected to the spark-quenching element plate 9. electrically connected via.

The rotor of the small DC rotating electric machine shown in FIGS. 4 and 5 is formed as shown in FIG. 8.

Note that the insulating material 7 shown in FIG. 7 is made of, for example, an insulating adhesive,
Alternatively, an insulating double-sided adhesive tape is used.If an insulating adhesive or an insulating double-sided adhesive tape is used as the insulating material 7 in this way, when the winding starts winding around the armature core, the winding Since it is firmly held on the peripheral surface of the child core without slipping, it has the effect of facilitating winding.

Further, 11 is a brush holding member fixed to the rear lid case 3,
12□ and 122 are brushes fixed to the member 11.

As described above, the present invention extends from the axial regulating portion 6, C962C of the support body 60, 6° to the core support portion 6, a, 6°a.
Connecting portion 6. By forming d and 6□d by recessing them inward and pushing the windings into the recesses, it is possible to prevent the overlapping portions of the armature windings from protruding in the axial direction of the shaft, and as a result, rotation is prevented. The axial dimension of the electric machine could be kept small, contributing to the miniaturization of rotating electric machines.

[Brief explanation of the drawing]

FIG. 1, FIG. 2, and FIG. 3 are diagrams for explaining conventional small-sized DC rotating electric machines, respectively. FIG. 4 is an axial cross-sectional view of a small DC rotating electric machine according to the present invention. FIG. 5 is a sectional view taken along the line V-V in FIG. 4. Figure 6 is the 4th
It is a figure for demonstrating the winding method of the rotor shown in the figure. FIG. 7 is an axial cross-sectional view showing the rotor shown in FIG. 4 during the manufacturing process. FIG. 8 is a diagram showing only the rotor shown in FIG. 4, and the negative part is cut in the axial direction. 6□...First support, 6□...Second
Support body, . . . Insulating material, 8 . . . Armature winding, 3 . . . Laminated core.

Claims (1)

[Scope of utility model registration request] A DC rotating electric machine having a rotating shaft, a ring-shaped iron core, and an armature that supports the ring-shaped iron core, has a support fixed to the rotating shaft, and has a winding wound around the outer periphery of the ring-shaped iron core. A connecting portion connecting the axial regulating portion of the support body and the core supporting portion at the axial end of the child is recessed inwardly, and the winding wound around the axial end is pushed into the recess. A DC rotating electrical machine characterized by the following configuration.