JPS5818752B2 - Seiryuushikiban no seizouhouhou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a commutator 7 board for mounting a commutator of a rotating device such as a small DC motor.

In the rectifier of a small DC motor used in a tape recorder, etc., powder generated by frictional contact between the rectifier 7 pieces and the brush 7 enters the slit between the rectifier pieces, and each rectifier R
- This impairs the insulation between the F pieces, resulting in problems such as a decrease in motor efficiency and a shortened lifespan.

Various methods have been devised to solve this problem.

For example, one method is to treat the entire commutator made of copper with an oxidizing agent to form an oxide film, and then cut the outer circumferential surface and terminal portion of the commutator 7 that come into contact with the brush 7 with a diamond cutting tool or the like. A method is used to prevent short circuits caused by the powder in the slit by exposing the bare surface and leaving a copper oxide film on the opposing surfaces of each rectifier piece that makes up the slit, and insulating the slit with this oxide film. .

A capacitor, coil lead, or rectifier R+ board is soldered, spotted, or
Since electrical connection is made using means such as caulking, it is necessary to remove the oxide film formed on the end 7 portion.

For this reason, when cutting the terminal, a certain degree of precision is required, making the cutting work difficult.

The present invention has been made in view of the above-mentioned circumstances, and after fixing a plurality of terminals of the rectifier 7 to a metal original plate in advance, the original plate and the rectifier 7 are oxidized, and then the original plate is cut and the plurality of terminals of the rectifier 7 are The present invention relates to a method for manufacturing a regular R-f board, characterized in that a plurality of end portions 7 are formed to which each terminal is fixed.

This allows the cutting process of the end 7 of the rectifier R7 to be omitted, and also prevents short circuits between the rectifier 7 board and other components.

Embodiments of the present invention will be described below with reference to the drawings.

First, a commutator substrate to which the present invention can be applied will be explained.

In the small DC motor, a capacitor is connected between the ends 7 of the electric machine 7 coil of the rotating machine 7 in order to eliminate noise caused by spark discharge between the brush 7 and the commutator 7.

Taking a three-pole motor as an example, each end of each electric machine's 7 coils 1, 2° 3 - fla, 2b, 3c are Y-connected as shown in Figure 1.
Three capacitors 4, 5, and 6 are connected between them.

FIG. 2 shows a chip capacitor (hereinafter simply referred to as a capacitor) that can be applied to the commutator substrate.

This capacitor 1 is constructed by pasting electrode plates 9 and 10 made of silver or the like on the front and back surfaces of a small disk-shaped dielectric 8 made of ceramic or the like.

Conventionally, such a capacitor 1 is molded 11 as shown by the imaginary line, and wires 4-+12 are attached.

13 was used, but in this embodiment, one without the mold 11 and the ends 712 and 13 is used.

The above-mentioned rectifier 1irt+ board is for adding the rectifier 7 and the above-mentioned capacitor.

FIG. 3 shows a first embodiment of the original plate 14 of the rectifier 7 substrate,
The original plate 14 is made by punching a strip-shaped thin metal plate made of copper into the shape shown.

A plurality of ring-shaped ends 16 connected via connecting pieces 15 are punched into the original plate 14, respectively.

It is formed.

The end 9 portion 16 is formed with a mounting portion 11 for a rectifier.

Next, as shown in FIG. 4, a straight IN 118 is attached to each attaching portion 17 of the original plate 14 having the above structure.

This adjustment R-f-18 is made of a cylindrical insulator 20 made of ceramic or the like and provided with a shaft hole 19 through which the rotating shaft of the motor is pushed.
and three rectifying pieces 21a, 21b made of copper fixed to the surface of this insulator 20.

21c, and terminals 22a, 22b, '22c bent at one end of the rectifier pieces 21a, 21b, 21c.
It is composed of seven rectifying pieces 21a, 21b,
Between the slits 21c are slits 23a and 23b deep enough to reach the insulator 20E.

23c is formed.

The alignment R-f 18 is attached to the three mounting portions 11 of the original plate 14 at the ends 722a, 22b.

22c is spot welded and fixed.

Next, when the original plate L4'El and the rectifier 718 in the state shown in FIG.
, 23b, 23c, an oxide film is formed on the surfaces thereof.

Next, the oxidized original plate 14 and the rectifier -flB are cut by a press between each connecting piece 15, each rectifier 718 of the original plate 14, and the end 7 portion 16 to form one rectifier 718 as shown in FIG. Commutator board installed one by one.

14a is obtained.

At this time, this commutator board 14a has a lead wire through hole 21.
It is also perforated by a press.

In this case, the end 1 part 16 is separated into three parts: a terminal part 16a,
16b and 16c, and each end has 7 portions 16a.

5 and 6 at both ends of 16b and 16c.

As shown, a bifurcated terminal piece 24 and a projecting piece-like end piece 7 25
is formed.

As shown in FIG. 6, these end pieces 24.degree. 251 expose the bare surface of the copper through the fractured surfaces 24a, 25a caused by the above-mentioned cutting and the inner surface 27al of the insertion hole 21.

Note that the many points 26 are oxide films.

The capacitor 1 shown in FIG.
The electrode plate and the fractured surfaces 24a and 25a are soldered, and then the seven rectifying pieces 21a and 21b are soldered.

A finished product as shown in FIG. 1 can be obtained by cutting off the oxide film on the surface of 21c that comes into contact with the brush 7 to expose the copper surface and giving it a mirror finish.

In the state shown in FIG. 7, the oxide film 26 remains on most of the rectifier 7 substrate 14a, the terminals 22a, 22b, 22c of the rectifier a-f 1 B, and the slits 23a, 23b, 23c.

Therefore, by this oxide film 26, the slits 23a, 23
b and 23c are insulated, and when the commutator board 14a to which this rectifier F1a is attached is added to the rotating motor of the motor, it is possible to prevent electrical short circuits due to contact with other circuit components or windings. can.

Furthermore, the ends 722a and 22b. The cutting process of 22c can be omitted.8 Also, lead wires can be passed through the insertion layer 21 and soldered to the inner surface 27a.

Note that the terminal pieces 24 and 25 are not limited to the shape shown in FIG. 6, but can be formed in various shapes that can hold the capacitor 7 therebetween.

Further, the material of the 5RT-7 board 14a is not limited to copper, and other materials such as nickel silver, silver, and nickel can also be used.

In this case, since the oxide film of nickel silver, silver, nickel, etc. has conductivity and can be soldered, the terminal pieces 24 and 25 can be formed in advance in the state of the original plate 14 in FIG. 3. .

In the present invention, after a plurality of terminals of rectification are fixed to a metal original plate in advance, the original plate and the commutator are oxidized, and then the original plate is cut to form a plurality of terminals with each of the plurality of ends 7 fixed. Since the end portion 7 is formed, the conventional process of cutting the terminals of the commutator can be omitted, and when a commutator board with the commutator 7 attached is added to the rotor. The oxide film does not cause short circuits due to contact with other parts, and the cut surface can be used to connect capacitors,
Effects such as being able to solder lead wires etc. can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a connection circuit diagram of a capacitor for noise removal of a small i11 IN motor, Fig. 2 is a connection circuit diagram of the capacitor for noise removal that can be applied to the present invention. Figure 4 shows the HA of the original plate with a commutator added.
Fig. 5 is a master drawing of the oxidized rectifier A and rectifier 1 board, Fig. 6 is an enlarged view of the main part of Fig. 5, and Fig. 1 is the completed rectifier 7 board and rectifier 1 board. This is a diagram of IN-F's trunk. In addition, in the symbols used in the drawings, 1 is the capacitor, 14 is the original plate of the commutator board, t4a is the rectifier 7 board, 1
6a, 16b, 16c are end A parts, 18 is rectification 7.2
4.25 is 7 pieces at the end.

Claims (1)

[Claims] 1 After fixing the plurality of ends 7 of the rectifier 7 to the metal original plate in advance,
A method for manufacturing a rectifier 7 substrate, characterized in that the original plate and the rectifier 7 are oxidized, and then the original plate is cut to form a plurality of terminal portions to which each of the plurality of terminals is fixed. .