JPH08317609A - Electrode forming method for surge absorbing electrode, attaching method of surge absorbing method and rotor - Google Patents

Abstract

PURPOSE: To facilitate attachment and to make it possible to achieve automatic attachment by alleviating the load for position alignment of both parts in the attachment of a varistor to a commutator part. CONSTITUTION: A ring electrode 30 used for the connection of a commutator piece 14a is formed on the entire surface of an outer surface 16a of a varistor 16 so as to cover the surface. Then, under the state wherein the varistor 16 in contact with risers 18, the ring electrode 30 of the varistor 16 and each riser 18 are connected by soldering. Finally, the ring electrode 30 is cut between the respective risers 18, and the individual electrode is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming electrodes of a surge absorbing element for a rotor used for eliminating noise generated during operation of a rotating electric machine, a method of attaching the surge absorbing element to a rotor, and a method thereof. It relates to a rotor formed by using.

[0002]

2. Description of the Related Art For motors and rotating electric machines such as generators,
There is a configuration in which the rotor side and the stator side are electrically connected via a commutator provided in the rotor and a brush provided in the stator, and as a typical example of such a rotary electric machine. Includes a DC generator and a DC motor.

The spark discharge generated between the commutator and the brush during the operation of the rotating electric machine causes electrical noise which is not preferable in terms of the function of the rotating electric machine and the operation of the surrounding electronic equipment, and moreover, the commutator. It causes the wear of the brush and the brush to be accelerated and deteriorates the durability. Therefore, conventionally, in order to suppress the occurrence of the spark discharge as described above, a surge absorbing element such as a ring-shaped varistor has been attached to the commutator portion. As such a proposal, Japanese Patent Laid-Open No. 1-224465 and Japanese Utility Model Laid-Open No. 61-1475
There are 825 etc.

FIG. 4 shows an example of a conventional DC motor rotor structure. The rotor includes an armature core 22 mounted and fixed around the rotary shaft 10, an armature coil 20 wound around the armature core 22, and a commutator 14 mounted and fixed on the rotary shaft 10. And a varistor 16 which is a surge absorbing element.

The commutator 14 is composed of three commutator pieces 14a attached to the rotary shaft 10 via an insulating material, and the armature coil 20 is provided at one end of each commutator piece 14a.
The riser 18 connected to the radial projection 18 is radially provided. The ring-shaped varistor 16 and the armature coil 20 which are surge absorbing elements are soldered and connected to the riser 18.

FIG. 5 is a perspective view of the varistor 16 shown in FIG. 4, and the side surface which is the ring surface of the varistor 16 has the same number of electrodes 30a as the commutator pieces 14a (here, three). Is provided. And this varistor 16
By soldering the riser 18 extended from each commutator piece 14a to each electrode 30, the varistor 16 and the commutator piece 14 are electrically connected and the varistor 16 is also connected.
Is mechanically attached and fixed to the riser 18. The soldering connection between the riser 18 and the armature coil 20 is performed prior to the attachment of the varistor 16.

[0007]

As described above, in the conventional mounting of the varistor 16, since the plurality of electrodes 30a corresponding to the risers 16 are formed in advance in the varistor 16, the varistor 16 is attached to each riser 18. Each electrode 30
a It is not possible to fix both by soldering after the alignment is done, which has been a problem in automating the varistor thinning work.

In particular, as shown in FIGS.
When each electrode 30a of 6 is formed at a hidden position on the back side of the varistor, the visibility at the time of alignment is poor,
This deteriorates the workability for narrowing the varistor, becomes a major problem that prevents automation, and also causes an increase in the cost of the manufactured rotor.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to reduce the burden of alignment when mounting the surge absorbing element on the rotor and to rotate the surge absorbing element. The object is to easily and automatically attach the work to the child and to reduce the manufacturing cost of the rotor.

[0010]

In order to achieve the above object, a method of forming electrodes of a surge absorbing element for a rotor according to the invention of claim 1 is to connect along a ring of a ring-shaped surge absorbing element. Electrode coating step of coating and forming a ring electrode for use with the electrode, and electrode separation step of cutting and separating the ring electrode of the surge absorbing element to form a plurality of individual electrodes corresponding to each connecting electrode piece extended from each commutator piece And are included.

According to the first aspect of the invention, the surge absorbing element is applied to the rotor by using the ring electrode, as compared with the conventional one in which the individual electrodes of the surge absorbing element are previously formed by using masking or the like. When installing, it is not necessary to align the electrodes formed on the surge absorbing element with the connecting electrode pieces of each commutator piece, and the work of attaching to the rotor of the surge absorbing element is easy and can be automated. As a result, the manufacturing cost of the rotor can be reduced.

According to a second aspect of the present invention, there is provided a method of mounting a surge absorbing element on a rotor, which comprises an electrode coating step of coating a ring electrode for connection with a commutator piece along a ring of the ring-shaped surge absorbing element. A mounting step of connecting and connecting the connecting electrode piece extended from each commutator piece to the ring electrode of the surge absorbing element, and cutting between the connecting electrode pieces of the ring electrode, corresponding to each connecting electrode piece And an electrode separation step of separating into separated electrodes.

According to the second aspect of the present invention, first, the ring electrode used for connection with the commutator piece is formed so as to cover the entire circumference of the ring-shaped surge absorbing element. Next, the rotation axis of the rotor is inserted into the ring hole of the surge absorbing element, and the surge absorbing element is moved until it comes into contact with each connecting electrode piece of the commutator. In this state, the connecting electrode piece extended from each commutator piece is attached to the ring electrode of the surge absorbing element. This attachment is performed by, for example, soldering connection.

After this attachment is completed, the ring electrode is cut between the connection electrode pieces to separate into individual electrodes corresponding to the connection electrode pieces.

Therefore, when the surge absorbing element is attached to the rotor, it is not necessary to align the electrodes formed on the surge absorbing element with the connecting electrode pieces of each commutator piece, and the surge absorbing element is rotated. The attachment work to the child is easy and can be automated, and the manufacturing cost of the rotor can be reduced.

Further, the invention of claim 3 is characterized in that, in the electrode coating step, the ring electrode is coated on the outer peripheral surface or the ring surface of the surge absorbing element.

According to the third aspect of the invention, the ring electrode is formed so as to cover the outer peripheral surface or the ring surface, that is, the end surface of the surge absorbing element. That is, the ring-shaped surge absorbing element has a rectangular cross section, and has an outer peripheral surface, an inner peripheral surface,
Also, a shape having a pair of ring surfaces located on both sides is common. In such a case, the ring electrode is preferably provided on the outer peripheral surface or the ring surface.

In particular, when the ring electrode is provided on the outer peripheral surface, the workability is high because the work area in the mounting process and the electrode separation process is highly visible, and the work of mounting the surge absorbing element on the rotor is high. Can be made easier. Moreover, since the surge absorbing element is often connected to the connecting electrode piece of each commutator piece together with the armature coil by soldering or the like, such good workability is important.

The invention of claim 4 is characterized in that, in any of claims 2 and 3, the riser of each commutator piece is used as the connecting electrode piece in the attaching step.

According to the invention of claim 4, the ring electrode of the surge absorbing element is attached to the riser of each commutator piece. That is, in a general rotor, the riser provided in each commutator piece as a terminal for connecting the armature coil to each commutator piece is also used as the connection electrode piece for attaching the surge absorbing element. As a result, the surge absorbing element can be attached without providing a special connecting electrode piece.

A rotor according to a fifth aspect of the invention is characterized by being formed by using the method according to any one of the second to fourth aspects.

According to the invention of claim 5, the rotor is formed by using the method of any one of claims 2 to 4. This makes it possible to provide a rotor in which the work of attaching the surge absorbing element to the rotor is easy and can be automated, and the manufacturing cost can be reduced.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, preferred embodiments of the present invention will be described in detail with reference to the drawings.

[First Embodiment] A front view and a side view showing the outline of a rotor manufactured by the method of the present embodiment are shown in FIGS. 1 (A) and 1 (B), respectively. Since the rotor of the present invention has the same basic configuration as the rotor of FIG. 4 described in the section of the related art, the same reference numerals are given to corresponding components, and the description thereof will be basically omitted. . In addition, in this embodiment, the shape of some of the components before being assembled to the rotor,
Although characteristic to the method of manufacturing the rotor, the resulting rotor may be the same as a conventional rotor.

The attachment of the varistor 16 of this embodiment to the rotor will be described below.

The varistor 16 used in this embodiment is shown in FIG.
As shown in the left part of (A), it is formed in a donut-shaped ring shape. The ring-shaped varistor 16 has a rectangular cross section and has an outer peripheral surface 16a, an inner peripheral surface 16b, and both side surfaces (both ring surfaces) 16c and 16c, as shown in FIG. ing.

The first feature of the method of this embodiment is that the ring electrodes 30 are continuously formed over the entire circumference of the outer peripheral surface 16a of the ring-shaped varistor 16. The ring electrode 30 is formed, for example, by coating a silver electrode over the entire outer peripheral surface 16a. The covering area may be the entire area of the outer peripheral surface 16a, or may be a strip area.

Next, the varistor 16 is inserted from the one end side of the rotating shaft 10 into the donut hole 16d of the varistor 16 so that the varistor 16 is inserted from the one end side of the rotating shaft 10 into the commutator 1.
4 is moved to a position in contact with the riser 18, which is the connecting electrode piece. At this position, the varistor 16 is arranged so as to be concentric with the commutator 14 portion as shown in FIG.

While maintaining such a position, the ring electrode 30 on the varistor 16 and the riser 18 of each commutator piece 14a are electrically connected and mechanically fixed by soldering or the like. At the same time, armature coil 2
2a is also soldered to the riser 18.

Particularly, in this embodiment, since the ring electrode 30 is formed over the entire outer peripheral surface of the varistor 16 during the electrical and mechanical connection work, the varistor 1
The ring electrode 30 of the varistor 16 and the risers 18 can be opposed to each other without aligning the 6 and the risers 18. Moreover, since the ring electrode 30 is provided on the outer peripheral surface 16a of the varistor 16, the visibility of the soldering work area is high, and the soldering work can be easily performed while visually checking the soldering location.

Next, as shown in FIG. 2C, the ring electrode 30 of the varistor 16 is partially cut and removed between the riser 18 and the riser 18 to remove the ring electrode 30.
The three cutting / separating portions 32 separate the three individual electrodes 30a electrically insulated from each other. As a result, the three risers 18 are individually soldered and connected to the three individual electrodes 30a formed on the varistor 16.

The cutting and removing may be performed by any method as long as electrical conduction of the ring electrode 30 is cut off at this portion, for example, a part of the ring electrode 30 may be scraped off by a grinder, Alternatively, a part of the ring electrode 30 may be removed by a laser.

By such a method, the varistor 16 can be attached to the rotor to form the rotor as shown in FIG.

According to the method of mounting the varistor 16 on the rotor as described above, as shown in FIG.
It is possible to properly solder the riser 18 of each commutator piece 14a to each individual electrode 30a on the varistor 16 without aligning the ring electrode 30 with each riser 18.

In particular, the conventional alignment is extremely difficult when assembling a small motor or the like in which each part is minute, which is an obstacle to automation of assembly. The method does not require such alignment and is extremely effective in automating the assembly.

[Second Embodiment] Next, the second preferred embodiment of the present invention will be described.
An example will be described.

FIG. 3A is a perspective view showing the external appearance of the varistor 16 of this embodiment before it is assembled to the rotor.

The varistor 16 of this embodiment is the ring electrode 3
0 is not provided on the outer peripheral surface 16a of the varistor 16 but on one side surface (ring surface) 16c continuously over the entire circumference thereof. Since the other points are the same as those in the first embodiment, the same reference numerals are given and the description thereof is omitted.

Also in the present embodiment, as in the case of the first embodiment, the varistor 16 is connected to each riser 18 of the commutator 14.
3 is attached by soldering or the like, electrically connected and mechanically fixed, and then a part of the ring electrode 30 between the riser 18 and each of the riser 18 is cut and removed to form a cut / separation portion 32, and FIG. As shown in (B), the ring electrode 30 is separated into a plurality of individual electrodes 30a.

The present invention is not limited to the above embodiments, but various modifications can be made within the scope of the invention.

For example, the surge absorbing element is not limited to the varistor 16 and may be any element capable of suppressing surge voltage.

Further, in the above embodiment, the case where the soldering connection is used for attaching the riser 18 and the ring electrode 30 has been described as an example, but the present invention is not limited to this, and for example, Japanese Patent Application No. 3-19961. As disclosed in the above-mentioned application, a method of press-contacting and fixing the varistor to the riser with a pressing ring may be used.

Further, in each of the above-mentioned embodiments, the varistor 16 having a rectangular cross section is used as the surge absorbing element, and the ring electrode 30 is provided on the outer peripheral surface 16a or the side surface 16c thereof. However, the cross-sectional shape of the surge absorbing element is not limited to the rectangular shape. Therefore, when the surge absorbing element has another cross-sectional shape, the ring electrode 3 is placed at a position corresponding to the cross-sectional shape.
It is sufficient to form 0.

The rotor to which the present invention is applied is not limited to a motor, but may be a generator.

Further, in the present invention, the connecting electrode piece extending from the commutator piece is not limited to the riser 18, but any connecting electrode piece may be extended from each commutator piece and electrically connected to the varistor 16. Good.

[0046]

As described above, according to the present invention,
It is possible to reduce the burden of alignment when mounting the surge absorbing element on the rotor, to easily and automatically mount the surge absorbing element on the rotor, and to reduce the manufacturing cost of the rotor.

[0047]

[Brief description of drawings]

FIG. 1A and FIG. 1B are a front view and a side view showing an outline of a rotor manufactured by using the method of the present embodiment.

2 (A), (B), and (C) are explanatory views schematically showing a mounting process of a varistor in the rotor of this embodiment.

FIG. 3 is an explanatory view of a second embodiment of the present invention, FIG. 3 (A) is a perspective view showing the appearance of the varistor of this embodiment before being assembled to the rotor, and FIG. 3 (B) is the rotor. 3 is a perspective view showing only the varistor in a state where a part of the ring electrode on the varistor is removed from the varistor.

FIG. 4 is an external view schematically showing an example of the configuration of a conventional DC motor rotor.

5 is a perspective view of a varistor used in the rotor of FIG.

[Explanation of symbols]

 10 rotating shaft 14 commutator 14a commutator piece 16 varistor 16a outer peripheral surface 16c ring surface 18 riser 20 armature coil 30 ring electrode 30a individual electrode 32 cutting and separating section

Claims (5)

[Claims] 1. An electrode coating step of coating and forming a ring electrode for connection along a ring of a ring-shaped surge absorbing element, and cutting and separating the ring electrode of the surge absorbing element, and extending from each commutator piece. And an electrode separation step of forming a plurality of individual electrodes corresponding to each connection electrode piece, and a method of forming an electrode for a surge absorption element for a rotor, comprising: 2. An electrode coating step of coating and forming a ring electrode for connection with a commutator piece along a ring of a ring-shaped surge absorbing element, and a ring electrode of the surge absorbing element extending from each commutator piece. An attachment step of attaching and connecting the connected connection electrode pieces, and an electrode separation step of cutting between the connection electrode pieces of the ring electrode and separating into electrodes corresponding to the connection electrode pieces. How to install a surge absorbing element on the rotor. 3. The method for mounting a surge absorbing element on a rotor according to claim 2, wherein, in the electrode coating step, the ring electrode is coated on the outer peripheral surface or the ring surface of the surge absorbing element. 4. The method for mounting a surge absorbing element on a rotor according to claim 2, wherein in the mounting step, the riser of each commutator piece is used as the connecting electrode piece. 5. A rotor formed by using the method according to claim 2.