JPS60162451A - Commutator of dc rotary machine - Google Patents

Abstract

PURPOSE:To prevent a shortcircuit accident of an equalizing wire by disposing the wire on the bore of commutator segments. CONSTITUTION:The commutator of a DC rotary machine is connected at the equalizing wire 13 with commutator segments, and secured to a commutator boss 8 with a clamping metal 12 and a clamping ring 9. The wire 13 is disposed in the bore side of the segments 3, and connected with the surface of the bore side of the segments 3. The connection is performed at one end of the wire 13 with the bore side of a riser 3a side and at the other end with the bore surface of opposite side of the other riser 3a via a brazed part B. Thus, it can prevent dusts from accumulating to the connected part B, and the wire 13 is readily connected in the state that the segments 3 and insulators 5 between the segments are annularly rounded with an element metal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a commutator for a DC machine, and particularly to a commutator for a DC machine in which a pressure equalizing line is connected to a commutator piece.

[Background of the invention]

Generally, when using overlapping or multi-wave winding in the ridges of a multi-wave direct current machine, an unbalanced current flows through brushes of the same polarity and generates sparks, so to prevent the generation of sparks, each armature Equalizing wires are provided that connect the equipotential parts of the windings. FIG. 1 shows a conventional example of a pressure equalizing edge circumference of a commutator of a DC machine. The equalizing wire 1 is sometimes provided on the side opposite to the commutator of the armature winding 2, but generally it is connected to the connection In (of the armature winding 2) at the riser 3a of the commutator piece 3, as shown in the figure. They are usually located close together.

By the way, in the pressure equalizing line 1 having such a structure, since the pressure equalizing line I is connected to the axial end of the commutator, dust may accumulate near the connection part A, causing a short circuit accident. The vicinity of the connection part A is on the inner diameter side of the electric machine pre-winding 1 wire 2, and cleaning and inspection from the outside is difficult.

In addition, in this structure, the pressure equalizing wire 1 must be arranged as shown in FIGS. 2 and 3, so not only is it not easy to form the pressure equalizing wire 1, but the pressure equalizing wire 1 1
Because the bending radius at the center of the line is small, accidents have occurred near the bending apex la due to damage to the voltage equalizing wire insulation 4 and cracking of the pressure equalizing line 11ilI itself.

FIG. 4 shows a conventional example of a commutator for a DC machine in which a pressure equalizing line is provided on the commutator side. In the figure, 5 is an inter-piece insulation for insulating the commutator pieces 3, 6.7 is a V-shaped insulation, 8 is a commutator boss, 9 is a tightening ring, and 10.11 is a protective insulation. As shown in the figure, the pressure equalizing wire 1 is arranged on the end face of the commutator piece 3 on the opposite side of the riser 3a, and the pressure equalizing wire 1 is protected by the edge of the equalizing pressure aL, such as glass tape, and is protected from dust. Although the deposition was improved to some extent, it had the following drawbacks. It is necessary to pressurize the commutator piece 3 by providing a groove for the connection part 1b (see FIG. 2) of the pressure equalizing line 1 at the opposite end of the riser 3a. The shape of the pressure equalizing line 1 is the second of two series.
The shape is the same as that shown in FIG. 3 and FIG. 3, and bending damage is likely to occur. The axial dimension of the commutator becomes longer due to the connection of the pressure equalizing line 1, which not only increases the size of the clamping fitting 12 but also increases the width and overall length of the machine, which reduces the critical rotational speeds of DC machines such as low F and SR. It goes against the trend of miniaturization, which has low costs and costs. The outer circumferential surface of commutator piece 3 has been used for many years! When it is worn out, the pressure equalizing wire 10 will be larger than the outer diameter of the commutator piece 3, and the pressure equalizing wire 1 will come into contact with the brush holder during disassembly and assembly of the brush holder, causing damage to the brush holder. A problem may occur.

[Purpose of the invention]

The present invention has been developed in view of the above points, and it is an object of the present invention to provide a commutator for a DC machine that can prevent short-circuit accidents in pressure equalizing lines.

[Summary of the invention]

That is, the present invention provides a direct current machine in which a pressure equalization line is connected to a commutator piece of a commutator, and the commutator piece is secured by a clamping fitting, in which the pressure equalization line is connected to 'f+is The pressure equalizing wire is disposed on the inner diameter side of the commutator piece and is connected to the inner diameter side surface of the commutator piece, whereby the pressure equalizing line is connected to the inner diameter side surface of the commutator piece. It comes to be arranged on the inner diameter side of the commutator piece.

[Embodiments of the invention]

The present invention will be explained below based on the illustrated embodiments. 8
! An embodiment of the present invention is shown in FIGS. f5 to 7. Note that parts that are the same as those in the conventional system are given the same reference numerals, and therefore their explanations will be omitted. In this embodiment, the pressure equalizing wire 13 is arranged on the inner diameter side of the commutator piece 3, and Mi! -, ('iL connected to the inner diameter 111i1 of the commutator piece 3 1ij7. By doing this, the voltage wire 13 is connected to the inner diameter side surface of the commutator piece 3) and the voltage is 4V #Ii) EiJ is arranged on the inner diameter side of the child piece 3 to prevent a short-circuit accident of 1.1 watts of pressure/attribute + ta, and a straight commutator can be obtained.

No, t straw jJ pressure, 11jth 3 -, jjfJ is the inner diameter of the riser 3a side of the commutator piece 3, and the other KjM is the soldering part on the inner diameter surface of the other eave flower piece 3 on the opposite side of the riser 3a. Brazing with B 1, K, N? , L, ta. By doing this, the pressure equalizing wire 13 is), -''01C inner diameter i11+ of the child J13
4 connected to one surface: They are arranged on the inner diameter side of the flow plate 3 to prevent dust from being deposited on the connection part B of the pressure equalizing wire 13. , it is possible to prevent a short circuit accident of the pressure equalizing line 13. And the pressure equalizing line 13 is connected between the commutator piece 3 and the piece II...! Since it can be easily connected to the side 5 by rolling it into an annular shape with an ltA metal fitting, there is no need to bend the voltage equalizing wire 13 at the center as in the conventional method, and damage to the voltage equalizing wire insulation due to bending and equalization can be avoided. Not only can accidents caused by cracks in the pressure wire 13 itself be prevented, but the simple shape facilitates manufacturing, and its reliability can be significantly improved. In addition, since the pressure equalization and Iil+I 13 are connected and arranged on the inner diameter side surface of the commutator piece 3, there is no need to increase the length of the commutator, and there is no need to increase the armature's dimension in the 111111 direction, and there is no need to increase the flame. This prevents the DC machine from becoming larger.
It is possible to prevent a decrease in the rotational critical speed and an increase in weight t. Further, even if the commutator pieces 3 are worn out due to long-term use, problems such as the pressure equalizing wire 13 coming into contact with the brush holder during disassembly and assembly of the DC machine can be prevented.

Another embodiment of the present invention is shown in FIG.

In this embodiment, a convex portion 3b for connecting the pressure equalizing wire 13a is provided on the inner diameter side surface of the commutator piece 3 to connect the pressure equalizing wire taa. By doing this, the pressure equalizing wire 138 only needs to be connected to this convex portion 3b, and it is possible to connect the pressure equalizing @ 13a to the inner diameter surface of the commutator piece 3 more easily than in the case described in Al1. The shape of the pressure equalizing wire 13a itself can also be simplified.

In addition, various pressure equalizing wire shapes can be connected depending on the space between the commutator piece 3 and the commutator boss.

[Effect of Qingming]

As described above, the present invention prevents dust from accumulating on the j-long portion of the pressure equalizing line, thereby preventing short circuit accidents in the pressure equalizing line. It is possible to convert the two-channel current of a DC machine into a 1:I ratio.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional side view of the riser circumference of a commutator of a conventional DC machine, Fig. 2 is a perspective view showing the shape of the pressure equalizing line of a commutator of a conventional DC TD, and Fig. 3 is a side view of the riser circumference of a commutator of a conventional DC machine. Enlarged view inside the frame, No. 4
The figure is a vertical side view of an example of a conventional DC-like commutator pond.
The figure is a longitudinal sectional side view of an embodiment of a commutator for a DC machine according to the present invention.
Figure 6 is a view from the Rollo arrow in Figure 5, and Figure 7 is a view from Figure 6.
8 is a plan view of a commutator piece of another embodiment of the commutator for a DC machine according to the present invention. 2... Armature winding, 3... Commutator piece, 3a... Riser, 3b... Convex portion, 4... Equalizing wire insulation, 5...
Insulation between one side, 67...V-shaped edge, 8...Commutator boss, 9...Tighten f=J'! j, to, ii...protective insulation, 12...tightening fittings, 13.138...equalizing wire. Agent Patent attorney Hiroo Nagasaki (and 1 other person) 1st man 2T2] I1 31211

Claims (1)

[Claims] 1. In a DC machine commutator in which a pressure equalizing wire is connected to a commutator piece of the commutator, and the commutator piece is tightened with a joint, the pressure equalizing line is connected to the inner diameter side of the commutator piece. A commutator for a DC machine, characterized in that the commutator is disposed in the commutator and connected to the inner diameter side surface of the commutator piece.