JPH05207717A - Brushless motor - Google Patents

Abstract

PURPOSE:To reduce the thickness and improve the insulating characteristic of a brushless motor used for various kinds of electronic equipment. CONSTITUTION:Since the soldered section 10 of the front end of a winding to electronic components 9 is brought to the rear surface side of the housing 2 of a printed board 8 and the projecting sections of the components 9 and soldered section 10 are put in the hole section 12 of the housing 2, the clearance between a rotating shaft 1 integrated with a hub and board 8 can be reduced and a brushless motor which has a thin thickness and excellent insulating characteristic can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solder portion of an electronic part or the like of a brushless motor.

[0002]

2. Description of the Related Art In recent years, magnetic recording devices have tended to be smaller and thinner in the OA field. Therefore, the spindle motor for rotating the magnetic disk is also required to be small and thin at the same time.

A conventional brushless motor will be described below. FIG. 4 shows the structure of a conventional brushless motor. 4 and 5, reference numeral 1 is a hub-integrated rotary shaft. 2 is a housing and 3 is a bearing. Reference numeral 4 is a magnet, 5 is a stator core, and 6 is a winding wire to be wound around the stator core 5. Reference numeral 7 is a winding tip of the winding wire 6, and 8 is a printed circuit board fixed to the housing 2. Reference numeral 9 is an electronic component, and 10 is a solder portion for fixing the electronic component 9 and the winding tip 7 to the surface of the printed circuit board 8. Reference numeral 11 is a hole in the housing 2 for allowing the back of the electronic component to escape.

The operation of the brushless motor constructed as above will be described below. When the winding 6 is energized, the magnet 4 repels due to the magnetic field generated in the stator core, and the hub-integrated rotating shaft 1 rotates.

[0005]

However, in the above-mentioned conventional structure, the solder portion 10 for fixing the terminal of the electronic component 9 is used.
Is not buried in the hole 11 of the housing 2 and protrudes largely on the front side of the printed circuit board 8, which makes it difficult to insert a gap with the hub integrated rotary shaft 1 of a small and thin spindle motor. Further, since the winding 6 and the solder portion 10 are close to each other, there is a problem that causes insulation failure.

An object of the present invention is to solve the above-mentioned conventional problems, and an object thereof is to provide a thin brushless motor installed so that a terminal fixing solder portion of an electronic component is embedded in a hole of a housing.

[0007]

In order to achieve this object, a brushless motor of the present invention has a hole portion for fixing the tip of an electronic component or a winding to the back surface of a printed circuit board by soldering and embedding the soldered portion. Is provided in the housing.

[0008]

With this configuration, especially in the case of a small and thin brushless motor, the gap in the height direction inside the motor is effectively utilized, and the hub-integrated rotary shaft and the winding caused by variations in the soldering of the terminals of the electronic parts or the winding tips It is possible to eliminate variations in the gap between the line and the contact. In addition, since the solder part of electronic parts does not exist on the front side of the printed circuit board but exists in the hole height of the housing on the opposite surface side, even if the winding is near the electronic parts, it will affect the insulation failure. Can be reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The same components as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIGS. 1 and 2, the terminals of the electronic component 9 are soldered on the rear surface of the printed circuit board 8 on the side of the housing 2.
It is fixed at. Projections of the electronic component 9 and the solder portion 10 from the back surface of the printed circuit board 8 are embedded in the hole 12 of the housing 2.

Further, as shown in FIG. 3, the winding tip 7 of the winding 6 is fixed to the rear surface of the printed board 8 on the housing 2 side by a solder portion 10, and the winding tip 7 and the printed board 8 of the solder portion 10 The protruding portion is the hole 12 of the housing 2.
It is buried in.

The operation of the brushless motor configured as described above will be described with reference to FIG. Since the terminal or winding tip 7 of the electronic component 9 is fixed to the back surface of the printed circuit board 8 by the solder portion 10 and embedded in the hole 12, the hub-integrated rotary shaft 1 should rotate close to the printed circuit board 8. You can

As described above, according to the present embodiment, the gap between the hub-integrated rotary shaft 1 and the printed circuit board 8 can be reduced, and the hub-integrated rotary shaft 1, the winding wire 6 and the solder portion 10 can be separated from each other. Since the printed circuit board 8 is interposed between them and the insulation distance can be secured, the brushless motor can be made thin.
In addition, insulation failure can be eliminated.

[0014]

As is apparent from the above description of the embodiments, according to the present invention, the terminals of the electronic parts and the ends of the windings are soldered to the back surface of the printed circuit board, and the protrusions are embedded in the holes of the housing. Therefore, the insulation distance between the hub-integrated rotary shaft and the winding wire is secured, and an excellent thin brushless motor in which insulation failure does not occur can be realized.

[Brief description of drawings]

FIG. 1 is a sectional view of a brushless motor according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line YY ′ of FIG.

FIG. 3 is a detailed view of a soldering end of a winding end of the brushless motor.

FIG. 4 is a sectional view of a conventional brushless motor.

5 is a sectional view taken along line XX ′ in FIG.

[Explanation of symbols]

 2 Housing 7 Winding tip 8 Printed circuit board 9 Electronic component 12 Hole

Claims (1)

[Claims] 1. A brushless motor in which an electronic component and a winding tip are soldered to a rear surface of a printed circuit board on a housing side, and a solder portion of the electronic component and the winding tip is embedded in a hole of the housing.