JPS62180281A - Contactor for commutator inspection - Google Patents

Abstract

PURPOSE:To test insulation while rotating a commutator by using a long-sized conductive core body which has small crossing length as compared with the gap length between adjacent commutator pieces and insulating reinforced bodies which have almost the same hardness as that of the conductor core body. CONSTITUTION:A contactor body 20 consists of the plate type conductive core body 22 and a couple of plate type insulating reinforced bodies 24 which sandwich it from both top and reverse surfaces, and the thickness L1 of the core body 22 is small as compared with the gap length L2 between the adjacent commutator pieces 1a; and the reinforced bodies 24 are formed of materials which are almost as hard as the core body 22 and the core body 22 and reinforced materials 22 are adheered together. Then, end surfaces of a couple of contactors 10 are brought into contact with the top surfaces of the commutator pieces 1a while shifted by one commutator piece 1a and the deflection of the pointer of a tester is confirmed while the commutator is rotated. Here, the end surface of the core body 22 conducts only when positioned on the top surface of the commutator piece 1a, but does not conduct when on an insulating piece 1b on condition that insulation is normal; if there is a defect in insulation, deflection is confirmed, so the commutator is rotated slowly to find an insulating piece 1b having the defect in insulation.

Description

[Detailed description of the invention] [Industrial applicability! ? ] The present invention relates to a technique for inspecting a commutator in a commutator machine such as a DC motor or an AC commutator motor, and is particularly used for inspecting continuity or insulation between a large number of commutator pieces that constitute a commutator. This relates to the structure of the contactor.

[Prior Art] For example, as shown in FIG. 6, a commutator 1 in a DC motor converts a DC current supplied from a brush 2 that is in frictional contact with this surface into an AC current that is synchronized with the rotation of an armature 3. The commutator piece Ia (f@) and the insulating piece 1b (
It is constructed in a cylindrical shape by alternately combining mica and Bakelite (see Fig. 7).

Among the large number of commutator pieces 1a, adjacent commutator pieces 1a,
It is necessary that the insulation between la is maintained by the insulating piece 1b, and the commutator pieces in a specific relationship (for example, 90" arrangement) need to be internally electrically connected through the coil. However, as a result of long-term use of DC motors, vibration,
Due to the influence of heat etc., its insulation properties (damage to insulation piece 1b, etc.)
Otherwise, the conductivity (cutting of the coil) may become defective, so it is necessary to inspect using a tester.

Conventionally, as shown in FIG.
The insulation degree is checked by visually checking the tester by contacting the tips of the fully bent rod-shaped contacts 4a and 4a of the tester with the surface of a, and checking is performed for the number of commutator pieces 1a. there were.

[Problems to be Solved] However, the conventional inspection techniques described above have the following problems.

That is, for example, since the number of pieces of commutator piece 1a needs to be checked, the inspection requires a lot of time and effort.
The commutator pieces 1a, la are arranged so that the contacts 4a, 4a are correctly adjacent to each other.
This required a person to contact the surface of the material one after another, and a person to check the insulation using a tester.

The purpose of the present invention is to solve the above problems, and!
? '! The object of the present invention is to provide a commutator testing contact that can efficiently test the conductivity or insulation between the commutator segments, and to provide a commutator testing method that enables testing of all commutator segments at once while rotating the commutator. The aim is to realize a contact for child testing.

[Means for Solving the Problems] In order to solve the above-mentioned problems, a commutator testing contact according to the present invention has a structure including a conductive core and an insulating reinforcing body, and the conductive cores are arranged adjacent to each other. The insulating reinforcement has approximately the same hardness as the conductive core, and has a side surface extending along its longitudinal direction. It is a potato-like thing that is straightened from at least one side.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a perspective view showing a first embodiment of a commutator testing contact according to the present invention.

FIG. 2 is a longitudinal sectional view of the first embodiment.

The commutator inspection contact 10 of the first embodiment has a contact body 2
0 and a cord connection part 30.

The contact main body 20 of substantial significance is a plate-shaped conductive core 22.
and a pair of plate-shaped insulating reinforcing bodies 24, 24 which are sandwiched from both the front and back sides, and have a sandwich structure of the same width. The plate-shaped conductive core 22 has high conductivity, and is formed of graphite in this embodiment. In addition,
The thickness (transverse length) Ll of the plate-shaped conductive core 22, which may be made of carbon, metal graphite, metal, etc., is determined by the thickness (transverse length) Ll of the plate-shaped conductive core 22, which may be made of carbon, metal graphite, metal, etc., as shown in FIG. This is smaller than the gap length L2 between them (corresponding to the thickness of the insulating piece 1b). The plate-shaped insulating reinforcing bodies 24, 24 are made of a material having approximately the same hardness as the plate-shaped conductive core 22, and in this embodiment, they are made of porosinite having a hardness approximately equal to that of graphite. has been done. The thickness L3 of the plate-shaped insulating reinforcing body 24 is greater than L2-Ll. In the case of this embodiment, the plate-shaped conductive core 22 and the plate-shaped reinforcing body 24 are pasted together with adhesive. .

The cord connecting part 30 is attached to one end of the contact main body 20 and has a hole 34 through which a core wire 32a of the cord 32 is passed, and the tip of the core wire 32a is connected to the end surface of the plate-shaped conductive core body 22. The plate-shaped conductive core body 22 and the core wire 32a are brazed to each other.
are electrically connected.

This commutator testing contact lO is used in place of the contact 4a of the conventional tester, but the third
As shown in the figure, the end faces of a pair of contactors 10.10 are shifted by one commutator piece 1a, brought into contact with the surfaces of the commutator pieces 1a and la, and the commutator is rotated until the pointer of the tester Check the vibration. The end face of the plate-shaped conductive core 22 is conductive only when it is located on the surface of the commutator piece 1a, and if the insulation is normal, there should be no conduction when it is located on the insulating piece lb, but it is due to poor insulation. If there is, there will be that feeling, so next time! ! ! The flow tube is rotated slowly and the insulating piece 1b, which is defective in insulation, is discovered. Here, the plate-shaped conductive core 2
In order to ensure that the end face of the plate-shaped conductive core 22 does not straddle the commutator piece 1a and is located only on the insulating piece lb, the thickness LL of the plate-shaped conductive core 22 is considerably smaller than the thickness of the insulating piece 1b. It's Toshide. In addition, since there is a slight step between the surface of the insulating piece 1b and the surface of the wave element piece 1a, in order to prevent the tip of the plate-shaped conductive core 22 from getting wedged inside the insulating piece lb, the plate-shaped A reinforcing body 24 is attached to a plate-shaped conductive core body 22. Note that instead of a pair of plate-shaped reinforcing bodies 24, one plate-shaped reinforcing body 2
4 may be simply pasted onto the plate-shaped conductive core body 22.

Due to the friction between the end face of the contactor lO and the surface of the commutator piece 1a, the end faces of the plate-shaped conductive core 22 and the plate-shaped reinforcing body 24 are gradually worn away. Since the material of the reinforcing body is boron nitride, which has approximately the same hardness as graphite, it wears out at the same rate, so the contact
There is no problem in contact with the end face of the O, and since it has solid lubricating properties, the sliding contact is smooth and has the effect of slowing down the progress of wear.

FIG. 4 is a perspective view showing a second embodiment of the commutator testing contact according to the present invention.

FIG. 5 is an exploded perspective view of the second embodiment.

Similarly to the first embodiment, the commutator testing contact 40 of the second embodiment has a six-contact body 5G consisting of a contact body 50 and a cord connection part Go, and a round bar-shaped conductive core 52 and a 6-contact body 5G. It is composed of a thick cylindrical tube body 54, and the materials thereof are the same as those in the first embodiment. The thick cylindrical tube body 54 has a round center hole 54a, and the round rod-shaped conductive core 5 is inserted into this round center hole 54a.
2 is press-fitted to form the contact main body 5o. The contact body 50 has a pencil-like structure. Note that the dimensional relationship is also the same as in the first embodiment. The contact main body 50 is the same as the first embodiment except that the contact body 50 is circular in shape.

According to the second embodiment, there is no need to bond the plate-shaped conductive core 22 and the plate-shaped reinforcing body 24 together using a young adhesive as in the first embodiment, and the round rod-shaped conductive core body 22 and the plate-shaped reinforcing body 24 do not have to be bonded together using a young adhesive as in the first embodiment. This is because the contact main body 50 can be assembled simply by press-fitting the conductive core 52.

The manufacturing cost is low and the round bar-shaped conductive core body 52
Since the core body 52 is protected and reinforced from all directions, there is an advantage that breakage of the core body 52 can be prevented. In addition, upon inspection, 41
When the contactor body 50 is brought into contact with the surface of the i-toucher, since its end face is rotationally symmetrical, there is an advantage that the contact can be made without directionality and that it is easy to handle.

[Effects of the Invention] As explained above, the commutator testing contact according to the present invention focuses on a method of testing continuity or insulation between commutator pieces while rotating the commutator, For this purpose, an elongated conductive core with a transverse length that is small compared to the gap length between adjacent commutator bars is used, in order to ensure that it is only sometimes located above the gaps between adjacent commutator bars. Along with providing a body,
In order to prevent the commutator pieces from getting wedged between adjacent commutator pieces, a longitudinal insulating reinforcing body is provided along the length of the conductive core with its side surfaces aligned from at least one side.
．． In order to equalize the degree of wear on both parts due to sliding, the hardness of both parts is made approximately equal, so that the following effects are achieved.

In other words, since it is possible to test the continuity or insulation between commutator pieces by contacting the surface of the commutator while it is rotating, it is possible to significantly reduce the testing effort, and it can be done quickly even by a human inspector. can be inspected.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a first embodiment of a commutator testing contact according to the present invention. FIG. 2 is a longitudinal sectional view of the first embodiment. FIG. 3 is a schematic diagram for explaining how the first embodiment is used. FIG. 4 is a perspective view showing a second embodiment of the commutator testing contact according to the present invention. FIG. 5 is an exploded perspective view of the second embodiment. FIG. 6 is a partially cutaway perspective view showing an example of a DC motor. FIG. 7 is a schematic diagram showing an aspect of conventional commutator inspection. 1. φ Commutator la...Commutator piece 1b...Insulating piece 10.40...Contactor for commutator inspection 20.50...Contactor body 30, Go.φ.Cord connection part 22 ... Plate-shaped conductive core 24 ... Plate-shaped insulating reinforcing body 32 1 cord 32 a ... Core wire 34 ... Hole 52 ... Round rod-shaped conductive core 54φ ... Thick cylindrical tube Body 54a...Round central hole.

Claims (4)

[Claims] (1) A longitudinal conductive core having a transverse length smaller than the gap length between adjacent commutator pieces, and a conductive core having approximately the same hardness as the conductive core in its longitudinal direction. 1. A commutator testing contact comprising a longitudinal insulating reinforcing body whose side surfaces are aligned from at least one side. (2) A patent claim characterized in that the conductive core is a plate-shaped body, and the insulating reinforcing body is a pair of plate-shaped bodies that sandwich the plate-shaped conductive core from both the front and back sides. range first (1
) Contactor for commutator inspection as described in section 2. (3) The conductive core is a round rod, and the insulating reinforcement is a thick-walled cylindrical tube having a round hole into which the conductive core of the round rod is press-fitted. A commutator testing contact according to claim (1). (4) Claims (2) or (3) characterized in that the conductive core is formed of graphite, and the insulating reinforcing body is formed of boron nitrite. Contactor for commutator inspection as described in section.