JPH10136616A - Dc motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To satisfactorily and surely obtain a DC motor in which the fusing treatment of a winding is executed by a method, wherein the crossing part of the winding is formed so as to be separated from a terminal for winding to the side of an armature. SOLUTION: A disk-like winding guide 20, which is composed of an insulating material is fixed and bonded to the edge on the side of an armature at a commutator 8. In addition, a plurality of protruding elements 21, which correspond to respective terminals 14 for winding, are installed integrally so as to protrude on the outer circumference of the winding guide 20. The protruding elements 21 protrude to the outside in the radial direction from the outer circumference of the commutator 8. When windings 11 are wound on the terminals 14 for winding and on the protruding elements 21, their crossing parts 11a are generated on a side opposite to the terminals 14 for winding at the protruding elements 21. In this manner, a distance D up to an electrode 18 for fusing from the crossing parts 11a can be made long. There is no possibility that an electrode 18 comes into contact with the crossing parts 11a, the fusing treatment of the windings 11 to the terminals 11a for winding can be executed satisfactorily and surely, and the windings can be connected electrically to the terminals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a direct current motor, and more particularly to a fusing process (heat welding) after winding an armature winding around a commutator winding terminal. The present invention relates to a DC motor that can be used.

[0002]

2. Description of the Related Art As shown in FIGS. 3 and 4, a DC motor 1 of this type generally has a cylindrical case 2 having a bottom and a cover 3.
A rotating shaft 6 rotatably disposed via a bearing 5 in a housing 4 composed of: an armature 7 and a commutator 8 mounted on the rotating shaft 6;
And a plurality of magnets 9 fixed to the inner peripheral surface of the case 2 so as to surround the outer periphery. The power supply brush 10 further includes two power supply brushes 10 slidably opposed to the outer peripheral surface of the commutator 8, and power is supplied to the winding 11 of the armature 7 by mechanical sliding contact between the power supply brush 10 and the commutator 8. Switch the direction of the current.

In order to switch the direction of such a current,
The commutator 8 is constituted by a brush sliding contact cylinder 12 having an outer peripheral surface formed of a conductive material. The brush sliding contact cylinder 12 is divided into a plurality of segments by providing a plurality of vertical grooves 13. At the same time, a winding terminal 14 to which the winding 11 is connected is integrally formed on each of the segments.

The structure of the commutator 8 will be described in more detail with reference to FIGS. This figure shows an insert-molded commutator assembly using a metal piece. That is, the commutator indicated by the reference numeral 8 in its entirety in the figure has three winding terminals 14 formed radially outward and projecting at equal angular positions spaced apart by 120 ° in the circumferential direction. A brush sliding contact cylindrical body 12 made of a conductive material integrally formed with the portion, and a synthetic resin or the like integrally formed by insert molding with one end portion extended inside the brush sliding contact cylindrical body 12. And an inner cylindrical body 15 made of an insulating material. A through hole 16 into which the rotating shaft 6 is press-fitted is formed at the center of the inner cylindrical body 15.

The brush sliding contact cylinder 12 has a hook portion 12 bent inward at an end opposite to the armature 7.
a makes it difficult to peel off from the inner cylinder 15.
Also, the outer peripheral surface of the brush sliding contact cylinder 12 is
Vertical groove 13 extending in the longitudinal direction at an interval of 0 °
The brush sliding contact cylinder 12 is divided into three segments 17 in the circumferential direction by the vertically divided grooves 13. I have.

In such a commutator 8 of the DC motor 1, the electrical connection between the winding 11 of the armature 7 and each winding terminal 14 is made by connecting the winding 11 to the winding terminal 14 as shown in FIG. After winding, fusing is performed. That is, since an enamel wire in which a copper wire is usually insulated and coated with an enamel is used as the winding 11, the electrode 18 is brought into contact with the winding terminal 14 and energized, and the enamel is melted by Joule heat generated at this time.
Electrical connection is achieved by heat welding the winding terminal 14 and the copper wire 2.

[0007]

However, the conventional DC motor 1 described above has a problem that the fusing process of the winding 11 cannot be performed smoothly and reliably. That is, when the winding 11 is electrically connected to the winding terminal 14 of the commutator 8 by fusing processing, the winding 1
When 1 is wound around the winding terminal 14, an intersection 11 a of the winding 11 is formed on the front side of the winding terminal 14. Therefore, the intersection 11a connects the winding terminal 14 to the electrode 1
8 and causes a defect in the fusing process. Further, if the electrode 18 is strongly pressed against the intersection portion 11a in order to obtain good contact with the winding terminal 14, there is a problem that the intersection portion 11a is crushed or damaged and the wire is broken.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. It is an object of the present invention to form a crossing portion of a winding away from a terminal for winding toward an armature side. It is an object of the present invention to provide a DC motor capable of performing a jing process satisfactorily and reliably.

[0009]

In order to achieve the above object, the present invention provides an inner cylinder made of an insulating material mounted on a rotating shaft,
A commutator is formed by a brush sliding contact cylindrical body made of a plurality of segments having a winding terminal integrally protruded from a winding side end and covering the outer periphery of the inner cylindrical body, and each of the windings is formed. In a DC motor in which an armature winding is wound around a wire terminal and electrically connected to the wire terminal, a plurality of wires protruding radially outward from the outer periphery of the commutator corresponding to each winding terminal on a winding side end surface of the commutator. A winding guide having a plurality of protrusions is provided, and a winding is wound around the protrusions of the winding guide and the winding terminals to be electrically connected. The present invention also provides an inner cylindrical body made of an insulating material to be mounted on a rotating shaft, and a plurality of segments having winding terminals integrally protruding from a winding-side end portion. A commutator is formed by a brushed contact cylinder made of a conductive material covering the commutator, and an end of the commutator is connected to the winding side of the commutator in a DC motor in which an armature winding is wound around each winding terminal and electrically connected. Provided on the outer periphery are a plurality of protrusions corresponding to each winding terminal and projecting radially outward from the outer periphery of the commutator,
The present invention is characterized in that a winding is wound around the projection and the winding terminal to be electrically connected. Further, the present invention is characterized in that the projection is integrally provided with the inner cylinder.

According to the present invention, since the winding is wound around the winding terminal and the projection, the intersection of the winding can be on the side opposite to the winding terminal of the projection. Therefore, the crossing portion is located away from the winding terminal, does not hinder the electrodes during the fusing process, and enables a good and reliable electrical connection between the winding and the winding terminal.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. FIG. 1 is a front view showing a commutator portion of a DC motor according to the present invention, and FIG. 2 is a plan view of a winding guide. Note that the same components as those shown in the section of the related art are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

In these figures, a winding guide 20 is fixed to the end face of the commutator 8 on the armature side, in other words, the end face on the side of the winding terminal 14. Winding guide 20
Is formed in a disc shape with an insulating material such as a synthetic resin and has an appropriate plate thickness and an outer diameter substantially equal to the outer diameter of the commutator 8. Further, a plurality of protrusions 21 corresponding to each winding terminal 14 are integrally provided at equal intervals in the circumferential direction on the outer periphery,
An insertion hole 22 through which the shaft 6 passes is formed at the center. The projection 21 projects radially outward from the outer periphery of the commutator 8. The reason why such a winding guide 20 is provided is that the winding 11 is wound around the winding terminal 14 and the protrusion 21, and an intersection 11 a of the winding 11 is connected to the winding terminal 14 of the protrusion 21 as shown in FIG. 1. Is caused on the opposite side.

As described above, when the winding guide 20 is provided and the intersection 11a of the winding 11 is positioned on the opposite side of the winding terminal 14 of the projection 21, the fusing electrode 18 is moved from the intersection 11a. 4 can be made longer than the distance d in the conventional DC motor shown in FIG. 4, there is no possibility that the electrode 18 contacts the intersection 11a, and the winding 11 and the winding terminal 14 The fusing process can be performed satisfactorily and reliably, and electrical connection can be made.

Here, in the above embodiment, an example was shown in which the winding guide 20 was joined to the winding-side end face of the commutator 8, but the present invention is not limited to this, and the commutator 8 is not limited thereto. The winding guide 20 may be formed integrally at the time of molding the inner cylindrical body 15 (see FIG. 5) constituting the above. In this case, there is no need to separately manufacture the winding guide 20 and attach it to the commutator 8, so that the winding guide 20 can be manufactured at low cost. Also, the inner cylinder 15
, It is also possible to protrude only the protrusion 21.

[0015]

As described above, according to the DC motor according to the present invention, the plurality of commutators, which correspond to the respective winding terminals and project radially outward from the outer periphery of the commutator, are provided on the winding-side end face of the commutator. A winding guide having a projection is provided, and a winding is wound around the projection of the winding guide and the terminal for winding, so that the winding is wound around the terminal for winding and the projection. At this time, the intersection can be formed on the side of the protrusion opposite to the winding terminal. Therefore, there is no possibility that the electrode 18 comes into contact with the intersection at the time of fusing processing of the winding, and the winding and the winding terminal can be connected well and reliably.

Further, according to the present invention, since the protrusion is integrally provided with the inner cylinder, the number of parts and the number of assembling steps are not increased, and the present invention can be provided at a low cost.

[Brief description of the drawings]

FIG. 1 is a front view of a commutator portion showing an embodiment of a motor commutator according to the present invention.

FIG. 2 is a plan view of a winding guide.

FIG. 3 is a sectional view showing a conventional example of a DC motor.

FIG. 4 is a front view of a commutator portion in a conventional motor.

5A and 5B show an example of a conventional commutator for a motor, and FIG.
FIG. 2 is a schematic plan view, and FIG. 2B is a schematic side sectional view of a main part thereof.

[Explanation of symbols]

Reference numeral 6: rotating shaft, 7: armature, 8: commutator, 10: power supply brush, 11: winding, 12: brush sliding contact cylinder, 13:
Vertically divided grooves, 14: terminals for winding, 15: inner cylinder, 17: segment, 20: winding guide, 21: protrusion.

Claims (3)

[Claims] 1. An inner cylindrical body made of an insulating material mounted on a rotating shaft, and a plurality of segments having winding terminals integrally projecting from a winding side end portion. A commutator is formed by a brushing contact cylinder made of a conductive material to be covered, and in a DC motor in which an armature winding is wound around each winding terminal and electrically connected, a winding-side end surface of the commutator, A winding guide having a plurality of protrusions corresponding to each winding terminal and projecting radially outward from the outer periphery of the commutator is provided, and a winding is wound around the protrusion of the winding guide and the winding terminal. A DC motor characterized in that the DC motor is electrically connected. 2. An inner cylindrical body made of an insulating material mounted on a rotating shaft, and a plurality of segments having winding terminals integrally projecting from a winding side end portion. In a DC motor in which a commutator is formed by a brushed contact cylinder body made of a conductive material to be covered, and an armature winding is wound around each of the winding terminals and electrically connected thereto, an outer periphery of a winding side end of the commutator is provided. A plurality of protrusions corresponding to each winding terminal and protruding radially outward from the outer periphery of the commutator, and a winding wound around the protrusion and the winding terminal to be electrically connected. DC motor characterized by the following. 3. The DC motor according to claim 2, wherein the protrusion is provided integrally with the inner cylinder.