JPS6055843A - Manufacture of commutator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing a commutator in contact with a brush in an electric motor.

Conventional configuration of conventional example g Problems Conventionally, in electric motors that combine a commutator and a brush that works with the commutator, the surface roughness of the commutator is adjusted by appropriate polishing, and during the manufacturing process of the commutator and brush surfaces. It is common practice to improve the contact stability between the commutator and the brush by removing as much contamination as possible.

However, even in an electric motor in which contact stability is achieved by such a method, deterioration in rotational performance, and in extreme cases, even a decrease in rotation γri' may occur depending on the operating environment conditions.

The causes of such rotational failure can be broadly classified into the following two types.

In other words, the increase in contact resistance due to the generation of 1'I and abrasive powder due to the commutator-brush sliding, and the increase in the noa between the commutator and the brush.
1.1 and an increase in contact resistance due to the formation of so-called blackened powder due to the adsorption of organic gases from the outside.

OBJECT OF THE INVENTION An object of the present invention is to prevent deterioration of rotational performance caused by the above-mentioned causes.

Structure of the Invention The present invention, as shown in FIG. , a layer of the organic substance is formed on the surface of the commutator 2. The organic layer formed by the method of the present invention prevents adsorption of organic gas from the outside and has a lubricating effect on sliding between the brush and commutator. Therefore, it is possible to eliminate at the same time the causes of rotation failures that occur in commutators manufactured by the above-mentioned conventional method.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention in a small electric motor will be described.
Compare and explain.

Conventional example: A small electric motor was manufactured using a commutator whose surface was polished with SiC abrasive paper and then washed with an organic solvent. This was subjected to a running test for 250 hours under actual use conditions, the current waveform was measured using an off-line graph, and the rotational performance was evaluated based on the rankings shown in Figure 2. In addition, in Figure 2, rank O indicates that there is no abnormality in rotational performance even after the running test, and rank 5 indicates that the root rotational performance has deteriorated as the number of ranks increases, and rank 5 indicates that the current is zero. (so-called OFF point) is observed for 3 seconds or more.

As a result, this conventional example was ranked 4-5.

It combines organic analysis methods such as infrared spectroscopy and gas mass spectrometry with surface analysis methods such as scanning electron microscopy, X-ray microanalyzer, Auger electron spectroscopy, and X-ray photoelectron spectroscopy. , evaluate the amount of organic matter on the surface of the commutator and the amount of wear on the commutator and brushes before and after the running test (
-fco result.

The amount of organic matter attached was more than 10 times that before the test, and the amount of wear was more than 10011 g.

Example 1: A paper tape immersed in octane or dripped with octane was run over the surface of a commutator after SiC polishing.

As a result of evaluating a small electric motor using this commutator in the same manner as the conventional example, the rotation performance was ranked 0 to 1, showing superior rotation performance compared to the conventional example.

The amount of organic matter attached is about soottg/C? There is no increase or decrease before and after M and running test, and the amount of wear is 11 compared to the conventional example.
It showed a value of 50 or less.

Example 2: A resin tape impregnated with ethanol dissolved in octadecane was run on the surface of a commutator polished in the same manner. The rotation rate of a small electric motor made of this commutator was 1 or less. The tendency was the same as in Example 1 in terms of sludge, amount of organic matter attached, and amount of wear.

Example 3 A resin tape obtained by dropping dibutyl phthalate onto the surface of the commutator was run on the surface of the commutator, and the rotational performance of the tape was examined, and it was ranked 0-1. The amount of organic matter attached and the amount of wear were the same as in Example 1.

Example 4: A resin tape obtained by immersing low molecular weight nylon in triclene containing 10 w/w% was run on the surface of a commutator.As a result of evaluating the rotational performance of a small electric motor made of this commutator, it was ranked O~ It was 1. The amount of organic matter attached is about 5
ottfl/lJ and did not increase even after running tests. 1, and the polishing J% ljl2 was less than 1 of the conventional example.

0 Example 5: A commutator was manufactured by dropping silicone oil and running a paper tape containing the silicone oil. As a result of evaluating this, the rotation performance rank was ◯ to 1, and the amount of organic matter attached did not change even when running. Indeed, the polishing A/L amount 1 was less than that of the conventional case.

As shown in the above examples, the types of compounds that are effective for improving rotational performance are:) In the ζ rough-in system, viscous liquids and solids, that is, compounds with about 6 to 20 carbon atoms, phthalate esters, In the case of systems, liquids with a viscosity of 1, such as dioctyl phthalate and methyl phthalate-1, in the case of nylon systems, low molecular weight: IV products, and in the case of silicone systems, greases, etc.
Oil-based products were particularly popular. Among these compounds, silicone-based compounds were found to have worse rotational performance in long-term durability tests than other compounds. The cause of this is that some silicone compounds may
This is considered to be because the contact resistance changes to 2 and the contact resistance increases. On the other hand, other paraffin-based, phthalate-based, and nylon-based compounds also had excellent chipping properties.

It is assumed that there are two reasons why these layers of organic matter improve the rotational performance of the electric motor.

(1) Suppression of wear powder generation due to improved sliding properties due to lubrication effect.

(2) Prevention of adsorption of organic gases from the outside Preventing the formation of blackened powder by VC.

These two effects correspond to the causes of rotational failure in the conventional electric motor described above, and simultaneously contribute effectively to improving rotational performance.

1, the optimal thickness for this action and effect is 0.5 to 200.
71 m is observed, but the reason for this is that the above-mentioned effect is insufficient at less than 0.5 Inom; This is considered to be because when the contact resistance exceeds m, an increase in contact resistance due to organic matter has an adverse effect.

In addition, when impregnating a paper or resin tape with the compound, if the compound is in liquid form, ↓j', and Iy, then immerse it in the paper-covered tape.

If the compound is not in liquid form, it may be immersed in an organic solvent containing the compound. Alternatively, the liquid compound or an organic solvent containing the compound may be dropped onto the paper or tape surface.

Effects of the Invention As is clear from the above embodiments, the present invention has a significant effect on improving rotational performance. As a side effect, the cleaning after the thin thread, which was necessary in the conventional method, is no longer necessary, and a cost advantage can also be expected.

[Brief explanation of drawings]

Figure 1 is a detailed illustration of the present invention represented by a cross section of a commutator and a tape impregnated with organic matter; Figures 2 (?L) to (
f) is a diagram showing the rotational performance rank of a small electric motor in a running test. 1... Tape, 2... Commutator.

Claims (2)

[Claims] (1) A paper reed or resin tape containing at least one of halafine, phthalate ester, nylon, and silicone compounds is run on the commutator surface to form a layer of the compound on the commutator surface. 1. A method for manufacturing a commutator, characterized by forming a commutator. (2) The resin tape of paper tape ζ is paraffin-based. In at least one of phthalate ester-based, nylon-based, and silicone-based compounds, it is immersed in an organic solvent containing the above compound, or the above compound or an organic solvent containing the above compound is dropped onto the surface. 2. A method of manufacturing a commutator according to claim 1, wherein the commutator is manufactured using a method of manufacturing a commutator.