JPS5840793Y2 - brushless motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a brushless motor, and particularly to an improvement in the mounting structure of a holder for housing a rotor position detection element thereof to a printed circuit board.

The efficiency of the rotor position detection element (Hall element, etc.) of a brushless motor increases as the precision of its mounting position with respect to the rotor improves.

However, according to the conventional method of installing rotor position detection elements,
There are problems with the level of skill of the workers, an increase in the cumulative tolerance of accuracy during component assembly, productivity, etc., and unless these problems are eliminated, it is not possible to improve the efficiency of the motor characteristics.

FIG. 1 is a diagram showing a conventional method of attaching a rotor position detection portion of a brushless motor using a three-phase one-phase current supply method.

In the figure, a terminal 2 of a rotor position detecting element (Hall element) 1' is bent by 90 degrees in advance, and the detecting element 1 is inserted and fixed into a holder 3.

Next, the holder protrusion 4 is fitted into the hole 6 of the printed circuit board 5, and then the protrusion 4 is melted by heating or the like to fix the holder 3 to the printed circuit board 5, and the rotor position detection element, motor winding, and magnet are fixed. It is structured to obtain a predetermined position.

However, according to such a mounting method, the cumulative tolerance increases because the positional accuracy of the holder, the accuracy of the printed circuit board, the assembly accuracy of the holder and the printed circuit board, the positional accuracy of the position detection element and the winding after fixation, etc. are added. and reduce efficiency.

Furthermore, it is necessary to bend the terminals of the rotor position detection element in advance, which requires many steps and has poor workability.

In order to improve the problems of the prior art, the present invention has been developed by integrally molding the winding bobbin and the holder for storing the rotor position detection element, thereby reducing the cumulative tolerance as much as possible and making the assembly work more efficient. To provide a handle structure that allows a holder to be easily fixed to a printed circuit board.

The present invention will be described below with reference to embodiments shown in the drawings.
FIG. 2 shows an embodiment in which the present invention is applied to a brushless motor using a two-phase one-phase energization method (one rotor position detection element is sufficient).

In the figure, the rotor position detection element 12 is inserted into a position detection holder 13 formed integrally with the bobbin 10.

Next, the holder lid 14, which is integrally molded in a manner similar to that shown in FIG.
Cover it with 2.

At this time, the holder lid pin 15 passes through the via hole 11 attached to the side surface of the holder 13, thereby preventing the rotor position detection element 12 from falling off.

Also, at the same time as the holder lid 14 is bent 180 degrees, the rotor position detection element terminal 12' is connected to the protrusion 1 on the side surface of the holder lid.
4' automatically bends 9C and forms.

Next, insert the bobbin 8 with the winding 9 into the bobbin 10,
The protrusion 19 of the bobbin 10 and the engagement recess 16 of the bobbin 8 are fitted together and fixed with a stop plate T.

Note that it is also possible to mold the bobbins 8 and 10 integrally.

After winding terminal processing, the protrusion 20 of the bobbin 10 and the printed circuit board notch 21. Holder lid pin 15, printed circuit board hole 18,
The terminals 22 of the bobbin 10 and the printed circuit board holes 23 are fitted, each terminal is fixed to the printed circuit board 11 by soldering, and the holder lid bottle 15 is fixed to the printed circuit board by heating or the like.

In Figure 3, the rotor position detection element 12 is connected to the position detection holder 1.
3 and the holder lid 13 is covered.

Note that, for example, providing an appropriate number of protrusions in the holder 13 is effective in preventing the element 12 from falling off.

Furthermore, by using a plurality of holders, it can be applied to brushless morphs that use any energization method, and the rotor position detection element is of course not limited to Hall elements, but may also be of any type, such as magnetically sensitive elements. .

As is clear from the above explanation, according to the present invention, the following excellent effects can be obtained.

(1) By integrally molding the winding bobbin and the position detection holder, the cumulative tolerance can be reduced compared to the conventional structure, so higher efficiency can be expected.

(2) Pre-processing of the rotor position detection element becomes unnecessary.

(3) The process of fixing the rotor position detection element to the printed circuit board is not necessary.

(4) The terminals of the rotor position detection element are fixed, making assembly easier.

(5) Productivity improves.

[Brief explanation of the drawing]

Fig. 1 is a perspective view for explaining the conventional mounting method of the rotor position detection part in a brushless morph, Fig. 2 is a perspective view showing an embodiment of the present invention, and Fig. 3 is a perspective view showing a rotor position detection holder. FIG. 8... Winding bobbin, 9... Winding wire, 10...
...Bobbin, 11...Printed circuit board, 1
3...Holder 14...Holder lid,
15...Holder lid bottle.

Claims (1)

[Claims for Utility Model Registration] A first bobbin around which windings of a brushless motor are wound, a second bobbin into which the first bobbin is inserted and fixed, and a second bobbin integrally formed with the second bobbin. It includes a holder for storing a rotor position detection element and a printed circuit board to which the second bobbin is attached. The holder has a lid that is coupled to the holder and covers the opening and is provided with a bottle, and a bottle hole that is provided on a side surface of the holder and into which the bottle is inserted when the lid is closed. A brushless motor characterized in that the holder is attached to the printed circuit board by fitting a bottle into the mounting hole of the printed circuit board.