JP2523503B2 - Commutator - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a commutator mainly used for flat motors.

2. Description of the Related Art Various commutators of this type have been proposed, as known from Japanese Utility Model Publication No. 56-101181 and Japanese Utility Model Publication No. 60-11657. In each commutator, a commutator segment is arranged on the outer surface of the main body, and hook-shaped connecting pieces of each commutator segment are arranged adjacent to each other in an annular shape.

FIG. 5 shows an example of a conventional armature for a flat motor using one of such commutators. The commutator a is located at the center of the group of windings b arranged in an annular shape, and the lead wire c of each winding b is connected to each connecting piece e of the commutator segments d which are adjacently arranged in an annular shape. In this connection, for example, a connecting wire between I and II of a winding b formed continuously is used as a lead wire c, and a small loop f formed in the middle of the lead wire c is wound around a connecting piece e. It is done by fusing.

Problems to be Solved by the Invention However, since the connecting pieces e arranged in an annular shape are close to each other, the problem that the portions of the lead wire c wound around the adjacent connecting pieces e easily contact each other. There is.
The contact portion may have a short state in which a bare portion is generated due to coating breakage during winding work or fusing work around the connection piece e of the small loop f, resulting in poor quality, which reduces yield. There is.

Means for Solving the Problems In order to solve the above problems, according to the present invention, a commutator segment is provided on an outer surface of a main body, and a hook-shaped loop for connecting a small loop of a lead wire is connected to the commutator segment. In the commutator in which the connecting pieces are arranged adjacent to each other in an annular shape, the connecting pieces are located with a gap between the connecting pieces on both sides, and the small size of each lead wire wound around and connected to the connecting pieces. The main body is provided with an insulating protrusion that isolates the loops from each other.

The insulative protrusions on the body of the commutator are located on both sides of each hook-shaped connecting piece, and a small loop of lead wire is wound around the connecting piece by the gap between the connecting pieces. To enable that. At the same time, the protrusion can prevent the lead wire portions connected by being wound around the adjacent connecting pieces from contacting each other, and even if the lead wire portion has a bare portion, the protrusion itself. The insulation of the lead wires keeps them insulated.
It cannot be electrically connected.

Embodiment A first embodiment of the present invention shown in FIGS. 1 to 3 will be described. In this embodiment, the commutator segments 2 are arranged on the side peripheral surface of the sleeve body 1 made of synthetic resin, and the hook-shaped connecting piece 3 having a smaller width than the commutator segment 2 is formed by bending at one end of each commutator segment 2. It shows the case of what was done. Main body 1 has a core 4
End portions of the core 1 on the side where the connecting piece 3 is located by elastically fitting a collar 5 made of synthetic resin as an insulating material to a portion of the core 4 protruding from the body 1. Applied to. On the outer periphery of the collar 5, insulating projections 6 are formed between the connecting pieces 3 with a gap S therebetween.

The collar 5 has a mounting hole 7 formed in the center of the collar, which is slightly smaller than the outer diameter of the mandrel 4, and radial notches 8 are provided at several points on the inner circumference thereof. And the mounting hole 7 is elastically fitted into the mandrel 4. The elastic fitting and the unevenness 4a formed on the outer periphery of the mandrel 4 prevent the collar 5 from being pulled out from the mandrel 4 and stably attached to the protruding base of the mandrel 4.
It is designed to maintain a firm fit to the end face of the.
The protrusion 6 is formed integrally with the collar 5. In some cases, the collar 5 is provided with a metal core plate, and the core plate 4 is attached to the core plate portion.
You may make it fit in.

In the lead wire 10 of the winding 9, the small loop 10a in the middle is wound around the connecting piece 3 by using the gap S between the connecting piece 3 and the protrusions 6 on both sides thereof, and the small loop 10a is connected to the connecting piece 3 by fusing. To be electrically connected to. This adjacent connection piece 3
The small loops 10a of the lead wire 10 connected to each other are prevented from contacting each other by the projection 6 located therebetween. Further, since the protrusions 6 are insulative, even if the small loops 10a adjacent to each other are bare due to coating breakage at the time of wrapping around the connecting piece 3 or fusing work, they are not electrically connected. Prevent them from being connected.

Therefore, even if the connection pieces 3 are arranged adjacent to each other in a ring shape,
Eliminates the possibility of contacting each other and electrically connecting the bare parts.

If the projection 6 has a shape such as a rounded end portion in the same direction as the tip of the connection piece 3, the connection piece 3 can have a small loop.
Since the wire of the small loop 10a is easily guided between the connecting piece 3 and the protrusion 6 when the 10a is wound, the small loop 10a
The work of winding a on the connection piece 3 can be easily performed without failure.

The second embodiment of the present invention shown in FIG. 4 is one in which the projection 6 is integrally formed on the synthetic resin portion forming the main body 1, and plays the same role as the projection 6 of the first embodiment.

The present invention can be similarly applied to commutators having different arrangement states of commutator segments as long as the connecting pieces are adjacently arranged in a ring shape.

EFFECTS OF THE INVENTION According to the present invention, since it has the above-mentioned configuration and action,
It is possible to reliably prevent the lead wires wound around each connection piece from touching each other at adjacent parts and causing a short circuit at the part that is bare due to the influence of fusing work, etc. Is greatly improved.

[Brief description of drawings]

FIG. 1 is an enlarged perspective view of a connecting portion between a connecting piece and a lead wire showing a first embodiment of the present invention, FIG. 2 is an overall vertical sectional view, FIG. 3 is a perspective view of a collar, and FIG. FIG. 5 is a partially enlarged perspective view showing a connecting piece and a protrusion showing the second embodiment, and FIG. 5 is a perspective view showing an armature of a conventional flat motor. 1 …… Main body 2 …… Commutator segment 3 …… Connecting piece 6 …… Projection S …… Gap.

Claims (1)

(57) [Claims] 1. A commutator in which commutator segments are arranged on an outer surface of a main body, and hook-shaped connecting pieces for connecting by connecting small loops of lead wires around the commutator segments are arranged in an annular shape adjacent to each other. Insulating protrusions, which are located between the connecting pieces with a gap between the connecting pieces on both sides, are provided on the main body so as to isolate the small loops of the lead wires that are wound around the connecting pieces and are connected to each other. A commutator characterized by that.