JPH11262221A - Armature of electric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use an armature for that accompanied by the twist wire of an electric motor, to prevent the excessive sag of a crossover from the core of a wire to a commutator after the force-refeeding of the commutator, after the wire has been wound to the core and to shorten the axial direction length of an armature. SOLUTION: This armature of an electric motor is constituted of a core 40, a rotary shaft 60, a commutator 20 and an insulating member 30 arranged between the core 40 and the commutator 20. A crossover holding part 32, which open larger beginning from the commutator 20 towards the core 40, is formed in the insulating member 30, and the slag of the extending line is absorbed even if the force-refitting of the commutator becomes large.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor armature having a commutator as a component.

[0002]

2. Description of the Related Art Conventionally, insulation between a rotating shaft and a winding between a commutator and a core is not always necessary because the winding does not normally come into contact with the rotating shaft. However, in recent years, in view of miniaturization or quality improvement of the electric motor, an armature using a twist winding method in which a winding can be arranged at a more central portion of the armature has been used. In this case, insulation treatment is performed. Was done. Here, as shown in FIG. 6, the twist winding method is such that a connecting wire 52 connecting from the slot 42 of the core 40 of the armature 10 to the segment 22 of the commutator 20 is, for example, connected to the commutator from the first slot 42-1. 20 is connected to the fourth segment 22-4 located beyond the position in contact with the outer diameter surface of the second segment 20.
Therefore, when such a twist winding method is used,
Since the connecting wire 52 is connected to the segment 22 beyond the position where the connecting wire 52 contacts the outer diameter surface of the rotating shaft 60, the connecting wire 52 comes close to or comes into contact with the outer diameter surface of the rotating shaft 60. Therefore, it is necessary to secure insulation, and the rotating shaft 6
0 is coated with an insulating resin powder on the outer diameter surface, or an axial insulating portion is integrally formed on a core insulating molded product as disclosed in JP-A-8-84458. Has been taken.

[0003]

Recently, in order to further reduce the size of the electric motor and to improve its applicability to functional products, it has been required to improve the quality of the crossover wire 52 for the purpose of relaxing the stress. Crossover 52 to segment 22
The commutator 2 for temporarily fixing the commutator 20 at a position where it can be easily connected, winding the winding around the core 40, and then moving the commutator 20 to the core 40 side
A zero re-pressing technique is used. This commutator 20
If the press-fitting of the armature is an appropriate amount of movement, the axial length of the armature 10 is shortened, and at the same time, the commutator 20 is moved toward the core 40. The stress on line 52 will be relaxed.
However, at present, in particular, due to a demand for a compact functional system product, there has been a particular demand for a motor that is prone to protrude in the axial direction with a reduction in the axial length as well as quality improvement. Therefore, it is necessary to use the twist winding method and to further increase the re-pressing movement of the commutator 20. In this case, the re-pressing movement amount becomes large,
Naturally, the slackness of the crossover wire 52 after the re-press-fitting also becomes large, which causes a problem such as unevenness of the winding layer wound around the core 40.

Therefore, the present invention ensures the quality of the commutator 20 even when the re-insertion movement of the commutator 20 is large, without causing the winding layer of the core 40 to be uneven, and furthermore, the motor is reduced in size, especially in the axial direction of the motor. An object of the present invention is to provide an armature of a motor whose length is further reduced.

[0005]

In order to solve the above-mentioned problems, according to the first aspect of the present invention, the position where the crossover connecting the slot of the core to the segment of the commutator contacts the outer diameter surface of the commutator from the slot position. In an armature of a motor having a twist winding connected to a segment located beyond, the armature includes the rotating shaft, the commutator having a plurality of the segments, and the core wound with a winding, An insulating member is provided between the commutator and the core, and has a crossover holding portion that expands as the axial direction advances from the commutator to the core.

According to a second aspect of the present invention, in the first aspect of the present invention, the insulating member is formed integrally with a core insulating molded member for ensuring insulation between the core and the winding. According to a third aspect of the present invention, in the first and second aspects of the present invention, the commutator has a fitting recess for fitting the insulating member on an end face facing the core.

Therefore, according to the first aspect of the present invention,
In an armature of a motor having a twist winding in which a crossover wire abuts on a rotating shaft, even if the repressing amount is increased, the insulating member expands in accordance with the moving amount of the repressing, so that the slack of the crossover wire is reduced. Absorbed.

According to the invention described in claim 2, according to claim 1
In addition to the effect of the invention, since the insulating member is formed integrally with the core insulating molded member for securing insulation between the core and the winding, the number of parts and the number of assembling steps can be reduced. According to the third aspect of the present invention, in addition to the effect of the second aspect of the present invention, the re-pressing amount can be further increased.

[0009]

(First Embodiment) A first embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG.

As shown in FIG. 1, an insulating member 30 is provided between the commutator 20 and the core 40. The insulating member 30 has a crossover holding portion 32 whose outer peripheral surface expands as it moves toward the core 40. The commutator 20 is temporarily fixed at one end to a position opposite to the core 40 from the final fixing position,
The winding 50 is wound around the core 40 by the above-described twist winding method. Next, as shown in FIG. 2, the temporarily fixed commutator 20 is moved to the core 40 side, that is, the commutator 20 is re-pressed to give an appropriate slack to the crossover 52 and shorten the axial length. After completion, the commutator 20 is finally fixed to the rotating shaft 60.

According to the above embodiment, the following effects are obtained. (A) The re-press-fitting of the commutator 20 causes the crossover 52
Is loosened, but is absorbed by the insulating member 30 having the crossover wire holding portion 32 expanding in the direction of the core 40.
Therefore, even when the re-pressing amount of the commutator 20 is large, the increase in the slack is reliably absorbed, and the size of the electric motor is reduced, particularly, the axial length is shortened while securing the quality.

(B) An insulating member 30 having a crossover holding portion 32 which gradually expands as it moves toward the core 40.
Is used, the loosening of the crossover 52 becomes substantially constant before or after or during the movement of the commutator 20, and the crossover 5
2 does not cause friction with the insulating member 30 when moving in the direction of the core 40, and the insulation is secured.

(Second Embodiment) Next, a second embodiment will be described with reference to FIG. In this embodiment, the same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 3, the insulating member 30 is formed integrally with the insulating molded product 70 of the core 40, and the maximum expanded portion of the insulating member 30 is formed of the core insulating molded product 70. It is connected to the end face 72. According to this embodiment, the following effects are obtained in addition to the effects of the first embodiment. (A) By integrating the insulating member 30 into the core insulating molded product 70, the man-hour for manufacturing the insulating member 30 can be reduced, and management-related costs based on the reduction in the number of parts are not required. Assembly-related costs such as eliminating the necessity of fixing work can be reduced, which can contribute to the cost reduction of the electric motor.

(Third Embodiment) Next, a third embodiment will be described with reference to FIG. In this embodiment, the same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 4, a fitting recess 24 into which the insulating member 30 is inserted is formed on the end face of the commutator 20 facing the core 40, and the commutator of the insulating member 30 is re-pressed when the commutator 20 is press-fitted. The tip 34 on the side of the 20 is inserted and fitted into the recess 24. According to this embodiment, the following effects are obtained in addition to the first and second embodiments. (B) When the commutator 20 is re-pressed, the insulating member 3
0 on the side of the commutator 20 is
, The length of the insulating member 30 in the axial direction can be lengthened by the insertion amount, and as a result, the re-pressing amount can be further increased.

(Fourth Embodiment) Next, a fourth embodiment will be described with reference to FIG. In this embodiment, the same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 5, a comb-shaped projection 35 extending toward the commutator 20 of the insulating member 30 is formed, and the commutator 20 is provided with the projection 34 in addition to the third embodiment. To form a skewer tooth groove portion 26 which engages with. The fixing of the commutator 20 to the rotating shaft 60 is performed by press-fitting or bonding at the inner peripheral portion excluding the comb-tooth groove portion 26. According to this embodiment, first to third
In addition to the embodiment described above, the following effects are provided. (B) When the commutator 20 is re-pressed, the insulating member 3
0 of the commutator 20 and the protrusion 36
Is inserted into the concave portion 24 and the groove portion 26, so that the axial length of the insulating member can be lengthened by the insertion amount. It can be increased for each additional part.

[0019]

As described above in detail, according to the first aspect of the invention, in the armature of the electric motor having the twist winding method, the slack of the crossover wire at the time of re-press-fitting of the commutator is suppressed, and The axial length can be reduced.

According to the invention described in claim 2, according to claim 1,
In addition to the effect of the invention, the insulating member is integrated with the insulating molded product of the core, so that the number of parts and the number of assembling steps can be reduced, and the cost of the motor can be reduced. According to the third aspect of the invention, in addition to the effect of the second aspect of the present invention, the tip of the insulating member is inserted and fitted into the recess of the commutator, so that the re-pressing amount can be further increased.

[Brief description of the drawings]

FIG. 1 is a front view of a commutator according to a first embodiment before re-press-fitting.

FIG. 2 is a front view of the first embodiment after recompression of the commutator.

FIG. 3 is a perspective view of an insulating member according to a second embodiment.

FIG. 4 is a cross-sectional view of fitting of a commutator and an insulating member according to a third embodiment.

FIG. 5 is a sectional view of a fourth embodiment of a commutator and an insulating member.

FIG. 6 is a schematic explanatory view of a twist winding method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Armature, 20 ... commutator, 22 ... segment, 22-1, ..., 22-12 ... segment number, 24 ... recessed part, 26 ... comb tooth groove part, 30 ... insulating member, 3
2. Crossover holding portion, 34: tip of insulating member, 36: comb-shaped projection of insulating member, 40: core, 42: core slot,
42-1,..., 42-12... Core slot number, 50... Winding, 52... Crossover, 60.
Core insulation molded product, 72: End face of core insulation molded product.

Claims (3)

[Claims] 1. An armature for a motor having a twist winding connecting a crossover wire connecting from a slot of a core to a segment of a commutator to a segment located beyond a position in contact with an outer diameter surface of a commutator from a slot position, An armature is provided between the commutator and the core in the axial direction, between the commutator and the core, between the commutator having the rotating shaft, the plurality of segments, the core wound with a winding, and the commutator. An armature for an electric motor, comprising: an insulating member having a crossover wire holding portion that expands with the passage. 2. The armature for an electric motor according to claim 1, wherein said insulating member is formed integrally with a core insulating molded member for securing insulation between said core and said winding. 3. The armature for an electric motor according to claim 1, wherein the commutator has a fitting recess on an end face facing the core, the fitting recess engaging with the insulating member.