JPS609421B2 - How to braze commutator and armature coils - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of brazing armature coils to a commutator, and an object thereof is to obtain a method for easily brazing coil pieces regardless of their thickness. It is in.

A conventional example will be explained based on FIGS. 1 to 3.

Reference numeral 1 denotes a commutator, and the commutator 1 is composed of a plurality of commutator pieces la with an insulator lb interposed between them, and each of the commutator pieces la has a groove-shaped guide portion lc at its tip.

Reference numeral 2 denotes a coil of an armature (not shown), which is composed of coil pieces 2a and 2b.

3 is a power supply device, and 3a and 3b are electrodes of the power supply device 3.

In the brazing process, the coil 2 with the brazing material 4 interposed between the coil pieces 2a and 2b is installed on the guide portion lc of the commutator piece la with the brazing material 4 interposed between the coil pieces 2a and 2b, and the coil 2 is placed on the coil piece 2a and on the commutator piece la. The electrodes 3a and 3b are pressed against the electrodes 3a and 3b, respectively, and electricity is applied. Coil piece 2a
, 2b, the brazing material 4, and the commutator piece la are heated. When the waxy material 4, which has a low melting point, melts, the power supply is stopped, and the electrodes 3a, 3 are heated.
After removing b, cool it by pouring running water on it to prevent insulator lb from burning out. In this way, the conventional brazing method requires the guide part lc, which becomes useless after brazing, and since the energization method is continuous as shown in FIG. The temperature rise is far greater than that of the commutator la, and it softens and collapses, making it impossible to braze.
In addition, since cooling is performed by pouring running water, there are disadvantages such as extra work such as processing of insulators. The present invention has been made to overcome these conventional drawbacks, and specifically provides a brazing method that enables thin coil pieces to be brazed using a holding jig.

An embodiment of the present invention will be described based on FIGS. 4 to 6. The same reference numerals in the figure as in FIG. 1 refer to the same parts, so the explanation will be omitted. Reference numeral 5 denotes a holding jig 5. The holding jig 5 has a groove 5a in the center for holding the coil 2, and the thickness 1 of the slope 5b forming the groove 5a is equal to the spacing between the coils 2 to be brazed on the commutator 1. Consists of the following.

In the brazing process, first, as is conventionally done, the coil 2 with the brazing material 4 sandwiched between the coil pieces 2a and 2b is grasped with forceps, and the coil 2 is rectified through the brazing layer 4. After pressing the electrodes 3a and 3b onto the coil piece 2a and the commutator piece la to position them, the electrodes 3a and 3b are pressed onto the coil piece 2a and the commutator piece la, respectively, and energization is carried out intermittently at different energization times as shown in FIG. Divide into sessions. This energization pattern shall be appropriately selected depending on the shapes of the coil 2 and commutator 1 and external conditions. 0.5 second energization-
The cycle is as follows: 2 seconds pause - 2nd stage energization for 1 second - 2 seconds pause - 3rd stage energization for 1.5 seconds. There is no need to cool the brazed part with running water after energization. After brazing the first coil 2 as described above, from the second coil onwards, the filter material 4 is placed between the commutator piece la and the coil piece 2b, and between the coil pieces 2a and 2b using a holding jig. 6, the outside of the slope 5b of the holding jig 5 is guided by the previously brazed coil 2, and placed on the commutator piece la by an operator or mechanically (not shown), The electrodes 3a and 3b are pressed onto the coil piece 2a and the commutator piece la, respectively, and energized by the energization method shown in FIG.

This operation is repeated in order to braze the coil 2 to the commutator 1. As described above, according to the present invention, the holding jig 5 can be positioned on the commutator piece la by using the coil 2 that has been brazed first, and the coil piece 2a held by the holding jig 5 can be positioned on the commutator piece la.
Since brazing can be performed by passing current between the and commutator pieces la, the guide portion lc of the commutator pieces la is not required, and even thin coils 2 can be easily brazed. Since it does not require cooling, it has practical effects such as greatly reducing the time required for brazing work.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional partial front view of a conventional example, FIG. 2 is a side view of FIG. 1, FIG. 3 is an energization graph of the conventional example, and FIG. 4 is an embodiment of the present invention 5 is a side view of FIG. 4, and FIG. 6 is an energization graph of the present invention. o1 is a commutator, la is a commutator piece, 2 is a coil, 2a
, 20 is a coil piece, 4 is a brazing material, and 5 is a holding jig.

O diagram Figure 4 ★Figure 2 Oh figure 5th figure Figure 5

Claims (1)

[Claims] 1. Sandwich the brazing material between the upper and lower armature coil pieces, grasp this pair of coil pieces with a gripping tool, and press them onto the commutator pieces of the commutator through the brazing material. After positioning, electrodes of a heating power source are pressed against each of the set of coil pieces and the commutator piece, and electricity is applied intermittently to braze the first set of coil pieces to the commutator piece, Next, a brazing material is sandwiched between another set of adjacent coil pieces and between this other set of coil pieces and another commutator piece adjacent to the commutator piece. The first set of coil pieces is inserted into the groove of the holding jig, and the plate part of the holding jig is brought into contact with one side of the first set of coil pieces for positioning.
A method for brazing a commutator and an armature coil, characterized in that the coil pieces are energized and brazed in the same manner as the pair of coil pieces, and the coil pieces are subsequently brazed to the commutator pieces in the same manner.