JPH06342989A - Power element fixing method - Google Patents

Abstract

(57) [Abstract] [Purpose] Regarding a method of fixing a power element such as a controller for a brushless motor to a radiation fin, by pressing the power elements together with a spring force, there is no insulation resistance,
Realize an extremely workable method. [Structure] One radiating fin is covered with one insulating sheet 6, a plurality of power elements 8 soldered to a substrate 1 is mounted on the insulating sheet, and a holding metal fitting 4 is provided with a holding spring 3 preassembled. The press fitting is fixed to the radiating fin with the screw 5 so that the cut and raised presses the power element. [Effect] When the power element is mounted, it is preliminarily soldered at the same time as other components or collectively mounted, so that workability is good and the cost is low, and a mounting method without insulation failure can be performed.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a brushless motor,
The present invention relates to a method for fixing a power element of a controller such as a DC motor to a radiation fin, and more particularly to a method for easily and surely fixing a plurality of power elements.

[0002]

2. Description of the Related Art As shown in FIG. 4, an insulating sheet is inserted between one power element and a radiation fin to insulate the screw, and the screw is also insulated with an insulating washer, and then fixed with a screw hole provided in the radiation fin. Was.

[0003]

Since the conventional power element fixing method is a screw fixing method, firstly, the insulating sheet is thin due to burrs in the screw holes, and holes through which screws pass are formed. If necessary, insulation could not be maintained, but it was necessary to check the pressure resistance after mounting. Secondly, it takes time to align the holes in the insulating sheet with the holes in the power element and the screw holes in the heat radiation fins, and the workability is poor and therefore expensive. Thirdly, after fixing the power element to the heat radiation fin with a screw, it is necessary to solder the legs of the power element to the substrate, which is extremely inferior in workability.

[0004]

As shown in one embodiment of the present invention, a method is used in which screws are not used for mounting and fixing the power element. Therefore, it is not necessary to provide an insulating sheet for each power element, and holes for screws are not required.

The pressing of the power elements is a pressure contact method using a spring, and a method of fixing a plurality of power elements at one time is adopted.

[0006]

The insulating sheet 6 collectively insulates a plurality of power elements. Also, align the notch with the origin of the heat dissipation fin,
Prevents displacement of the insulation sheet during work. The presser spring has a structure in which it is fixed to the presser metal fitting with spring action due to the notches and bends at both ends so that it will not fall during work.
Further, the cut-and-raised portion of the pressing spring fixes the power element to the radiating fin with a necessary pressure via the insulating sheet.

[0007]

Embodiments of the present invention will be described in detail with reference to FIG.

The method of fixing the power element in the present invention is as follows.
First, the insulating sheet 6 having notches 6a and 6b at both ends as shown in FIG. 2 is placed on the radiation fins (shown by broken lines in the figure). At this time, the position is also determined by the protrusions 7a and 7b of the heat radiation fin and the cutouts 6a and 6b of the insulating sheet.

Next, the power element 8 previously soldered to the board 1 at the same time as other components is attached by the board attaching screw 2 so as to be on the insulating sheet 6. In this case, for the power element, only the dimensional accuracy in the direction of the insulating sheet is important,
The dimensions in the upper and lower directions and the left and right directions in the upper diagram of FIG. 1 are not necessary so long as they do not come into contact with each other and do not deviate from the insulating sheet. The mounting accuracy of the power element in the direction of the insulating sheet can be sufficiently assembled by extending the board to the bottom of the power element at the time of component insertion and placing the power element on this board, or by pressing it from the top and soldering. Sometimes it can be mounted with no problem, and after soldering, the substrate under the power element is removed (generally, a V-cut is provided and separated from it).

Next, as shown in FIG. 3, notches 3 are formed at both ends.
a, the holding spring 3 having the bent portion 3c and the same number of cut-and-raised portions 3b as the necessary power elements are attached to the holding metal fitting 4. The presser fitting 4 includes a notch 3a and a bent portion 3 of the presser spring 3.
A protrusion 4a and a hole 4b are provided corresponding to c, the bent portion 3c is inserted into the hole 4b, and the presser spring 3 is pushed in the left-right direction in the figure, so that the protrusion 4a of the presser fitting has a cutout of the presser spring 3. Three
Hook and fix a. Therefore, the presser spring 3 is fixed to a fixed position without dropping.

Then, as shown in FIG. 1, the holding metal fitting is fixed with the holding metal fitting mounting screw 5 in the screw hole 9 of the radiating fin. At this time, the cut-and-raised portion 3b of the presser spring 3 presses each power element by a predesigned pressure.

As described above, according to the present invention, the insulating sheet 6 is used.
Unlike the conventional insulating sheet 10, all the power elements are insulated with one sheet, and holes for screws are not required. Therefore, unlike the conventional example, there is no failure of withstand voltage, and the withstand voltage check after mounting the power element is not required. It becomes unnecessary. In addition, since a plurality of power elements can be pressed and fixed together, the workability is extremely good and the cost can be reduced as compared with the conventional single power element screw fixing method.

Furthermore, since the power element 8 is soldered at the same time as other components are soldered, it is not necessary to solder after mounting the power element as in the conventional example, and the workability is further improved. The practical effect is extremely large.

[0014]

According to the present invention, when the heat dissipation fins of the power elements are mounted, there is no failure in withstand voltage, and therefore, it is not necessary to check after mounting, and a plurality of power elements can be mounted in a lump. In addition, it is possible to solder with other parts at the same time, and the mounting reliability is high, the workability is extremely good, and the cost is low, so that the power element mounting method can be realized.

[Brief description of drawings]

FIG. 1 is an explanatory view of a power element mounting method showing an embodiment of the present invention.

FIG. 2 is a detailed view of mounting an insulating sheet of the present invention.

FIG. 3 is a detailed view of attachment of a presser spring of the present invention.

FIG. 4 is an explanatory diagram showing an example of a conventional power element mounting method.

[Explanation of symbols]

1 ... Board, 2 ... Board mounting screw, 3 ... Holding spring, 4 ... Holding metal fitting, 5 ... Holding metal mounting screw, 6 ... Insulating sheet, 7 ... Radiating fin, 8 ... Power element, 9 ... Screw hole, 10 ... Insulation Sheet, 11 ... Insulation washer, 12 ... Screw, 13 ... Screw hole.

Claims (1)

[Claims] 1. A method of fixing a power element (8) to a radiation fin (7), the projections (7a, 7a) of the radiation fin.
(b) with the cutouts (6a, 6b) of the insulating sheet aligned, and the power element (8) previously fixed to the substrate is placed on the insulating sheet, and the pressing spring (3) is fixed in advance. A method of fixing a power element, characterized in that the metal part assembly is configured such that the cut-and-raised portion (3b) of the pressing spring presses the power element from above the power element (opposite to the insulating sheet).