JP3106582B2 - DC brushless motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a DC brushless motor used for OA equipment or audio and video equipment.

[0002]

2. Description of the Related Art In recent years, OA equipment, audio and video equipment have been becoming smaller and thinner. Accordingly, there has been a demand for downsizing and thinning of DC brushless motors.

Hereinafter, an example of a conventional brushless motor will be described with reference to the drawings. FIG. 3 is a cross-sectional view of a conventional brushless DC motor.
And a rotor frame 36 having a cylindrical rotating permanent magnet 35 that is multipolarly magnetized and held by a bearing 33 and a thrust receiving plate 34 that are held. After the IC 311 is mounted on the anti-rotor frame side substrate 37 around the armature 310 around which the coil 39 is wound via the insulator 38, a shield plate 312 for shielding magnetic noise is mounted on the substrate 37. And the armature 310
Is disposed on the substrate 37 by the resin member 313,
The armature 310 is disposed so as to face the cylindrical rotating permanent magnet 35 to constitute a DC brushless motor.

[0004]

However, in the above-mentioned conventional configuration, the IC 311 is disposed at a position facing the peripheral portion of the armature 310 on the board 37.
Therefore, it is difficult to perform the pattern wiring from above, and the outer shape of the substrate 37 on the pattern wiring must be increased, so that it is difficult to reduce the size of the DC brushless motor.

Further, by arranging the IC 311 on the substrate so that the IC 311 comes to the slot between the salient poles of the armature, the thickness of the DC brushless motor can be reduced. The coil 39 wound around the armature 310 has a structure that makes it difficult to make the DC brushless motor thinner.

An object of the present invention is to solve the above-mentioned problems and to provide a smaller and thinner DC brushless motor.

[0007]

SUMMARY OF THE INVENTION To achieve this object, a DC brushless motor according to the present invention is mounted on a frame.
Shaft that is rotatably held by a mounted bearing and this shaft
And a rotor that holds a multi-pole magnetized permanent magnet
The coil was wound around the frame and insulator
An armature and a fixing member for attaching the armature
A brushless DC motor facing the armature end face.
The armature end face and the board are
Rarely, a portion corresponding to the vicinity of the armature center on the board
Provided with an IC, or the substrate is made of metal.
A substrate, and mounting the IC on the metal substrate;
It is an IC chip sealed and molded with fat .

[0008]

According to this structure, since the IC is arranged on the substrate facing the center of the armature, the pattern wiring from the IC can be easily performed, and the area of the pattern wiring on the substrate can be reduced. The outer shape of the substrate can be reduced, and a small DC brushless motor can be realized.

Further, since the IC requiring the most space in the circuit components is arranged near the center of the armature, there is no restriction from the coil wound on the armature, and a thinner DC brushless motor can be provided. Can be realized.

[0010]

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a DC brushless motor according to an embodiment of the present invention. In FIG. 1, a rotating shaft 1 is held by a bearing 3 held by a frame 2, and a retaining ring 4 attached to the rotating shaft 1 is held by a bearing 3 via a spacer 5 in a thrust direction. The rotor frame 7 that holds the magnetized cylindrical rotating permanent magnet 6 is held. A coil 10 is wound around the armature 8 via an insulator 9 and a fixing member 11 is attached. An IC 13 is mounted on the substrate 12 so as to be located near the center of the armature 8, and a shield plate 14 for shielding magnetic noise is disposed below the substrate 12. Further, the fixing member 1
After fixing 1 to the substrate 12 with the fixing member 15, the armature 8 is disposed so as to face the cylindrical rotating permanent magnet 6, thereby constituting a DC brushless motor.

(Embodiment 2) Hereinafter, a second embodiment of the present invention will be described with reference to the drawings.

FIG. 2 is a sectional view of a DC brushless motor according to a second embodiment of the present invention. In FIG. 2, the rotating shaft 1 is held by a bearing 3 held by a frame 2.
In the thrust direction, a retaining ring 4 attached to the rotating shaft 1 is held by a bearing 3 via a spacer 5 and holds a rotor frame 7 holding a multi-pole magnetized cylindrical rotating permanent magnet 6. ing. A coil 10 is wound around the armature 8 via an insulator 9 and a fixing member 11 is attached. After the IC chip 213 is mounted on the metal substrate 212 so as to be near the center of the armature 8, the thermosetting resin 214 is dropped and sealed. After the fixing member 11 is fixed to the metal substrate 212 by the fixing member 15, the armature 8 is arranged so as to face the cylindrical rotating permanent magnet 6, thereby constituting a DC brushless motor.

[0014]

As described above, according to the present invention, since the IC is arranged on the substrate facing the center of the armature, the restriction on the pattern wiring from the IC is eliminated, and the area of the pattern wiring on the substrate is reduced. Since it can be reduced, the outer shape of the substrate can be reduced, and a small DC brushless motor can be realized.

Further, since the IC is arranged near the center of the armature, there is no restriction from the coil wound around the armature, and a smaller DC brushless motor can be realized. .

[Brief description of the drawings]

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

FIG. 2 is a sectional view of a DC brushless motor according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view of a conventional DC brushless motor.

[Explanation of symbols]

 1,31 rotating shaft 2,32 frame 3,33 bearing 4 retaining ring 5 spacer 6,35 cylindrical rotating permanent magnet 7,36 rotor frame 8,310 armature 9,38 insulator 10,39 coil 11 fixing member 12,37 Substrate 13, 311 IC 14, 312 Shield plate 15 Fixing material 34 Thrust receiving plate 212 Metal substrate 213 IC chip 214 Thermosetting resin 313 Resin member

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H02K 29/00 H02K 21/22

Claims (2)

(57) [Claims] 1. A bearing rotatably mounted on a bearing held by a frame.
The held rotating shaft and this rotating shaft are fixed and multi-pole magnetized
Rotor frame that holds the permanent magnets
Armature with a coil wound through a radiator and this armature
With a brushless DC motor consisting of a fixing member
A substrate is provided at a position facing the armature end face,
Between the armature end face and the substrate,
A DC brushless motor characterized in that an IC is provided in a portion corresponding to the vicinity of the center of the armature . 2. The DC brushless motor according to claim 1, wherein the substrate is a metal substrate, and the IC is mounted on the metal substrate and is an IC chip sealed and molded with a thermosetting resin.