JPH09252566A - Small size dc motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To insure the reliability of electrical continuity and fixing between commutator risers and a ring varistor and, further, reduce the working man- hours by a method wherein a riser by which the continuity and fixing of a winding are provided and a riser by which the continuity and fixing of a ring varistor are provided are formed on one segment of a commutator. SOLUTION: An exclusive 1st riser 8A by which a winding 2 is fixed to the segment 6 of a commutator 5 and the continuity between the winding 2 and the segment 6 is provided and an exclusive 2nd riser 9 by which a ring varistor 3 is fixed to the segment 6 and the continuity between the ring varistor 3 and the segment 6 is provided are formed on one segment 6. With this constitution, even if the variation in heights of the risers are produced or even if the gaps between the inner surfaces of the ring varistor 3 and the bent commutator risers are large when the commutator risers are bent and connected to the windings 2 by fusing, the workability can be improved and, further, the reliability of the electrical continuity and fixing between the commutators and the ring varistor can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small direct current motor used for office automation equipment, information equipment, and other industrial equipment.

[0002]

2. Description of the Related Art In recent years, with the expansion of the market, small DC motors are required to be further miniaturized and to have improved quality, performance and reliability.

A conventional small DC motor will be described below. FIG. 4 is a view showing one piece of a commutator of a conventional small DC motor.

FIG. 5 is a diagram of a commutator, a ring varistor and a connecting portion of a conventional small DC motor. In FIG. 5, 1
Is a shaft, 2 is a winding, and 3 is a ring varistor. Four
Is a ring varistor electrode, 5 is a commutator, and 6 is a piece of commutator. Reference numeral 7 is solder, 8 is a commutator riser, and the winding 2 is connected to and fixed by bending the commutator riser 8 by fusing. In many cases, a wire coating with a high insulation grade or a wire with a thick wire diameter is fixed by conduction by fusing. The ring varistor 3 is electrically connected and fixed by the electrode 4 of the ring varistor and the solder 7 at the commutator riser 8.

FIG. 5 shows a diagram of a three-pole commutator,
The same is true for commutators with three or more poles. FIG. 6 is a sectional view of a conventional small DC motor. In FIG. 6, 3 is a ring varistor and 5 is a commutator.

[0006]

However, in the above-described conventional structure, since the commutator riser is bent to fuse the winding, the height variation easily occurs due to the bending, and the ring varistor is electrically connected to the commutator riser by soldering. In addition, when fixing, it is necessary to make a large gap between the inner diameter of the ring varistor and the bent commutator riser. If the gap becomes large, the soldering work becomes difficult, or the amount of solder needs to be increased, resulting in poor workability, a lot of man-hours, and lack of reliability in conduction and fixing.

The present invention solves the above-mentioned problems of the prior art by providing an inexpensive and highly reliable small DC motor capable of ensuring the reliability of conduction and fixing of the commutator riser and the ring varistor and reducing the number of work steps. The purpose is to provide.

[0008]

In order to achieve this object, a small direct current motor of the present invention is provided with a single piece of a commutator,
The fuser has a structure in which a riser for conducting and fixing the winding and a riser for conducting and fixing the ring varistor are respectively formed by fusing.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention has a field magnet magnetized in a circumferential direction in a frame inner diameter portion, a shaft in the center, and a circumferential direction facing the field magnet. With the changeable magnetic poles arranged at equal intervals, a commutator that rotates in the same manner as the changeable magnetic pole, an amateur assembly that changes the changeable magnetic field with the commutator, and a configuration in which the commutator is electrically energized, It has a pair (+ pole, − pole) of brush / terminal plate assembly, and is provided with a bracket for holding the brush / terminal plate assembly and a bearing for supporting the shaft, and suppresses sparks and noise between slits of the commutator. A first riser that is provided with a ring varistor that is electrically connected to and fixed to a commutator riser as a protection element, and that electrically connects and fixes a winding of an amateur assembly to one piece of the commutator. Power ring varistors A small direct current motor characterized by having a second riser that electrically conducts and fixes the riser height when bending the commutator riser to fuse the windings. , The workability is good and the commutator riser is equipped with a dedicated riser for conducting and fixing the ring varistor even if the inner diameter of the ring varistor and the bent commutator riser are wide. It is possible to secure reliability for conduction and fixing of the ring varistor.

The invention according to claim 2 is the small direct current motor according to claim 1, characterized in that the first riser and the second riser are constituted by a single riser having separate ends. With this configuration, the same effect as that of claim 1 can be obtained even for a small-sized small DC motor in which the commutator has a small diameter and it is difficult to separately provide the first riser and the second riser.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. (Embodiment 1) FIG. 1 shows a commutator, a ring varistor, and a wire connection portion according to a first embodiment of the present invention. In FIG. 1, 1 is a shaft, 2 is a winding, 3 is a ring varistor, 4 is a ring varistor electrode, 5 is a commutator, 6 is a piece of a commutator, 7 is solder, 8A is a commutator 5 and a winding. It is a riser for connecting and fixing the two. 9 is a riser for connecting and fixing the ring varistor 3,
It is electrically connected and fixed to the electrode 4 of the ring varistor by soldering or the like.

FIG. 2 shows one piece of the commutator of the small direct current motor configured as described above. In FIG. 2, 8
A is the first for connecting and fixing the commutator 5 and the winding 2.
And 9 is a second riser for conducting and fixing the ring varistor 3.

By providing a dedicated first riser 8A for conducting and fixing the arc 6 of the commutator 5 and the winding 2 and a dedicated second riser 9 for conducting and fixing the ring varistor 3, The workability is good, the number of man-hours is suppressed, and the reliability of the conduction and fixing of the commutator riser and the ring varistor can be secured.

(Second Embodiment) FIG. 3 is a diagram of one arc piece of a commutator of a small direct current motor according to a second embodiment of the present invention. In FIG. 3, 8A is a first riser for connecting and fixing the commutator and the winding, and 9 is a second riser for connecting and fixing the ring varistor. The configuration is similar to that of FIG. The difference from FIG. 2 showing one piece of the commutator of the configuration of FIG. 1 is that the roots of the two risers are one, and the riser tips are separated for winding and ring varistor. Is.

[0015]

As described above, according to the present invention, one riser for conducting and fixing the winding, and a riser for conducting and fixing the ring varistor are provided on one piece of the commutator. By providing it, it is possible to realize an excellent inexpensive and highly reliable small DC motor which has good workability, can reduce man-hours, and can secure reliability for conduction and fixing of the commutator riser and the ring varistor.

[Brief description of drawings]

FIG. 1 is a diagram of a commutator, a ring varistor, and a connecting portion of a small DC motor according to a first embodiment of the present invention.

FIG. 2 is a diagram of one piece of a commutator of a small DC motor according to the first embodiment of the present invention.

FIG. 3 is a view of one piece of a commutator of a small DC motor according to a second embodiment of the present invention.

FIG. 4 is a diagram of one piece of a commutator of a conventional small DC motor.

FIG. 5 is a diagram of a commutator, a ring varistor, and a connecting portion of a conventional small DC motor.

FIG. 6 is a sectional view of a conventional small DC motor.

[Explanation of symbols]

 1 shaft 2 winding 3 ring varistor 4 ring varistor electrode 5 commutator 6 commutator fragment 7 solder 8 commutator riser 8A first riser 9 second riser

Claims (2)

[Claims] 1. A field magnet magnetized in a circumferential direction in an inner diameter portion of a frame, and a change magnetic pole having a shaft in the center and facing the field magnet at equal intervals in the circumferential direction. An armature assembly that has a commutator that rotates in the same way as the changing magnetic pole, and that changes the changing magnetic field with the commutator, and a structure in which the commutator is electrically energized. And a bracket for holding the brush / terminal plate assembly, and a bearing for supporting the shaft, electrically connected to the commutator riser as a protective element for suppressing sparks and noise between the slits of the commutator, and A ring riser to be fixed, and a first riser for electrically connecting and fixing the winding of the armature assembly to one piece of the commutator and a second for electrically connecting and fixing the ring varistor. With the riser Small direct current motor characterized by comprising. 2. The small direct current motor according to claim 1, wherein the first riser and the second riser are constituted by a single riser having separate ends.